Uniform air supply device and method for top-wind preserved fruit drying box

Abstract

The present invention provides a uniform air supply device and method for a top-draft preserved fruit drying box, comprising a central processing unit, an airflow circulation control unit, a flow guide device and a flow guide control unit; the central processing unit is respectively connected to the airflow circulation control unit and the flow guide control unit; the flow guide device is connected to the flow guide control unit; the airflow circulation control unit is used to control the wind direction switching and wind speed according to the airflow circulation direction switching time and the airflow circulation wind speed set by the central processing unit; the flow guide control unit is used to control the reciprocating motion of the flow guide device according to the displacement rate of the flow guide device set by the central processing unit; the central processing unit is used to set a fixed output position of the flow guide device according to the drying process requirements, flexibly adjust the forward and reverse reversing time and wind speed of the fan according to the width of the preserved fruit material layer and the process requirements, and flexibly set the vertical position or displacement rate of the guide plate according to the process requirements of different moisture stages in the drying process, so as to effectively improve the drying efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of airflow circulation control in a preserved fruit drying process, and comprises a uniform air supply device and method for a top-draft preserved fruit drying box. Background Art

[0002] The drying process of preserved fruits and dried fruits is an important part of industrial and agricultural production, and it is also an important process that affects product quality. Hot air drying technology has been widely used in agricultural products, food processing and other processing industries. The uniformity of the wind speed flow field during the drying process of the hot air drying system has a direct impact on the drying quality stability and drying efficiency of the dried products. Therefore, the design of the wind speed flow field uniformity is particularly important in the design of different drying equipment. At present, various hot air drying equipment used for preserved fruits and dried fruits are mainly divided into top wind type, side wind type and end wind type according to the structure of airflow circulation.

[0003] In the prior art, in the top-wind hot air drying equipment, since the air circulation fan is installed on the top of the drying box (chamber), it is easy to be coupled and affected by the parameters such as the height and width of the air flow channel, the circulation wind speed, the height interval and width of the material layer, etc., and the uniformity of the wind speed flow field is often difficult to ensure, resulting in problems such as unstable product quality and low drying efficiency during the drying process. In addition, in actual production, due to the influence of the non-uniformity of the wind speed flow field, it is often necessary to obtain uniform moisture content of the product by changing the position of the material layer during the drying production process, which increases labor intensity and energy consumption and affects work efficiency. Summary of the invention

[0004] The object of the present invention is to provide a uniform air supply device and method for a top-wind type preserved fruit drying box, so as to improve the drying efficiency of preserved fruits.

[0005] The first aspect of the present invention provides a uniform air supply device for a top-wind preserved fruit drying box, comprising:

[0006] A central processing unit, an airflow circulation control unit, a flow guiding device and a flow guiding control unit;

[0007] The central processing unit is respectively connected to the airflow circulation control unit and the flow diversion control unit;

[0008] The flow diversion device is connected to the flow diversion control unit;

[0009] The airflow circulation control unit is used to control the wind direction switching and wind speed according to the airflow circulation direction switching time and airflow circulation wind speed set by the central processor;

[0010] The diversion control unit is used to control the diversion device to reciprocate according to the displacement rate of the diversion device set by the central processor;

[0011] The central processing unit is used to set the fixed output position of the guide device according to the drying process requirements.

[0012] Optionally, the diversion control unit includes a servo drive mechanism and a reduction box, the servo drive mechanism is connected to the reduction box, and the servo drive mechanism is a high-temperature servo motor.

[0013] Optionally, the guide device includes a support frame, a guide plate I, a guide plate II, a ball screw, a screw nut, a coupling and a bearing seat, the top of the support frame is connected to the servo drive mechanism, the guide plate I and the guide plate II are respectively connected to the ball screw, the ball screw is connected to the screw nut, and the coupling is respectively connected to the reduction box and the bearing seat.

[0014] Optionally, the reduction box is a worm gear reduction box, the guide plate I and the guide plate II are arc-shaped guide plates, and the ball screw includes a longitudinal ball screw and a transverse ball screw.

[0015] Optionally, the airflow circulation control unit includes an axial flow circulation fan and a drive control unit, and the axial flow circulation fan is connected to the drive control unit.

[0016] Optionally, one or at least one axial flow circulation fan is provided, and the forward and reverse efficiencies of the axial flow circulation fan and the driving control unit are set to be the same or similar.

[0017] The second aspect of the present invention provides a uniform air supply method for a top-draft preserved fruit drying box, the method is applied to a uniform air supply device for a top-draft preserved fruit drying box, the device comprising a central processing unit, an airflow circulation control unit, a flow guide device and a flow guide control unit; the central processing unit is respectively connected to the airflow circulation control unit and the flow guide control unit; the flow guide device is connected to the flow guide control unit;

[0018] The method comprises:

[0019] Set the airflow circulation direction switching time and airflow circulation speed;

[0020] When the airflow circulation direction switching time reaches a preset time, the airflow circulation control unit is driven to perform wind direction circulation switching and continuously output the airflow circulation wind speed;

[0021] Setting the displacement rate of the diversion device;

[0022] driving the flow guiding device to reciprocate according to the displacement rate;

[0023] Setting a fixed output position of the diversion device;

[0024] The guide plate is driven according to the fixed output position to uniformly supply air based on the fixed output position.

[0025] Optionally, the setting of the displacement rate of the flow guiding device and driving the flow guiding device to reciprocate according to the displacement rate includes:

[0026] Set the displacement rate I of the guide plate I;

[0027] Set the displacement rate II of the guide plate II;

[0028] Determine whether the positions and displacement rates of the guide plate I and the guide plate II are the same. If so, perform synchronous reciprocating motion according to the displacement rate I or the displacement rate II.

[0029] It can be seen from the above technical solution that the present invention has the following beneficial effects:

[0030] The present invention provides a uniform air supply device and method for a top-draft dried fruit hot air drying equipment. On the one hand, different widths and displacement distances of guide devices can be flexibly designed according to different specifications and sizes of different drying boxes; on the other hand, different airflow circulation wind speeds, reversing time intervals, reciprocating motion rates or fixed position outputs of guide devices can be set according to different process requirements, which can meet the requirements of different top-draft drying boxes and different drying processes to the greatest extent, improve the smoothness and uniformity of wind speed in the process of drying preserved fruits and dried fruits, improve drying efficiency, reduce operating labor intensity, and thus improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a principle block diagram of the uniform air supply device of the top-wind preserved fruit drying box in the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of a single flow guiding device in the present invention;

[0033] Figure 3 It is a structural schematic diagram of the uniform air supply device in the present invention;

[0034] Figure 4 The figure is a schematic flow chart of a uniform air supply method for a top-draft preserved fruit drying box in the present invention. DETAILED DESCRIPTION

[0035] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0036] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0037] Embodiment 1

[0038] See also Figures 1 to 3 The uniform air supply device of the top-wind preserved fruit drying box provided in the present application comprises a central processing unit 1, an airflow circulation control unit 2, a flow guide device 3 and a flow guide control unit 4, wherein the central processing unit 1 is connected to the airflow circulation control unit 2 and the flow guide control unit 4 respectively; the flow guide device 3 is connected to the flow guide control unit 4; the airflow circulation control unit 2 is used to control the wind direction switching and wind speed according to the airflow circulation direction switching time and airflow circulation wind speed set by the central processing unit 1; the flow guide control unit 4 is used to control the reciprocating motion of the flow guide device 3 according to the displacement rate of the flow guide device 3 set by the central processing unit 1; so that the airflow wind speed and time passing through the material layer 5 are similar within the stage time, and the central processing unit 1 is used to set the fixed output position of the flow guide device 3 according to the drying process requirements, so that the airflow passes through a certain material layer in a fixed manner. The uniform air supply device of the top-wind preserved fruit drying box of the present invention can be applied to most of the top-wind preserved fruit hot air drying boxes or drying chambers, and can greatly improve the uniformity of the wind speed flow field to solve the problems of unstable product quality, low drying efficiency, and high labor intensity.

[0039] Furthermore, the diversion control unit 4 includes a servo drive mechanism 41 and a reduction box 42. The servo drive mechanism 41 is connected to the reduction box 42. The servo drive mechanism 41 is a high-temperature servo motor. The diversion device 3 includes a support frame 31, a guide plate I 32, a guide plate II 33, a ball screw 34, a screw nut 35, a coupling 36 and a bearing seat 37. The top side of the support frame 31 is connected to the servo drive mechanism 41, the guide plate I 32 and the guide plate II 33 are respectively connected to the ball screw 34, the ball screw 34 is connected to the screw nut 35, and the coupling 36 is respectively connected to the reduction box 42 and the bearing seat 37. The central processor 1 drives the servo drive mechanism 41, so that the reduction box 42 drives the ball screw through the coupling 36. Rod 34, wherein the reduction box 42 is a worm gear reduction box, the ball screw 34 is divided into a longitudinal ball screw and a transverse ball screw, the guide plate I 32 and the guide plate II 33 are arc-shaped guide plates, the drive of the longitudinal ball screw causes the screw nut 35 connected to the guide plate to move up and down or be fixed to a certain height position, the drive of the transverse ball screw causes the screw nuts 35 at both ends of the guide plate to move up and down synchronously, and finally the position and displacement rate of the guide plate I 32 and the guide plate II 33 in the guide device 3 are fed back to the central processor 1.

[0040] Furthermore, the airflow circulation control unit 2 includes an axial flow circulation fan 21 and a drive control unit 22, the axial flow circulation fan 21 is connected to the drive control unit 22, wherein the axial flow circulation fan 21 is one or at least one, and the forward and reverse efficiencies of the axial flow circulation fan 21 and the drive control unit 22 are set to be the same or similar, and the axial flow circulation fan 21 and the drive control unit 22 control the wind direction switching and wind speed control by setting the airflow circulation direction switching time and the airflow circulation wind speed, so that the inlet and outlet airflows passing through the preserved fruit and dried fruit material layer are switched regularly to increase the uniformity of temperature and humidity.

[0041] Embodiment 2

[0042] See also Figure 4 The uniform air supply method of the top-wind preserved fruit drying box provided in the present application comprises the following steps:

[0043] S1: Query the airflow circulation direction switching time t and airflow circulation wind speed V a ;

[0044] S2: Determine whether the airflow circulation direction switching time t reaches a preset time, wherein the preset time is set according to the time set by the central processor 1;

[0045] S3: If yes, drive the airflow circulation control unit 2 to switch the wind direction and continuously output the airflow circulation wind speed V a ;

[0046] S4: Determine whether the output position of the flow guiding device 3 is fixed;

[0047] S5: If yes, query the position values ​​of the guide plate I 32 and the guide plate II 33 in the guide device and output the positioning drive to the central processor 1;

[0048] S6: If not, query the displacement rates V1 and V2 of the guide plate I 32 and the guide plate II 33 in the guide device 3;

[0049] S7: When the circulating fan is running, determine whether the positions and displacement rates of the guide plate I 32 and the guide plate II 33 are the same;

[0050] S8: If yes, the guide plates on one or both sides of the top-wind dried fruit drying box are controlled to reciprocate in the vertical direction according to the circulation direction of the fan, so that the airflow flows evenly over the surface of the dried fruit material within a period of time;

[0051] S9: setting fixed output positions L1 and L2 of the guide plate I 32 and the guide plate II 33 in the guide device 3 according to the process requirements of different moisture stages of the drying process;

[0052] S10: The guide plate is driven according to the fixed output position to supply air evenly based on the fixed output position, so that the flow rate and time of the circulating airflow through different material layers in the height direction of the entire drying process are close, thereby increasing the moisture uniformity of the preserved fruit product.

[0053] The vertical position or displacement rate and movement direction of the above-mentioned guide plate will be sent to the central processor 1 and output through the feedback signal, so that the user can set the time, wind speed and the vertical position, displacement rate or movement direction of the guide device again according to the feedback signal. This cycle of operation can minimize the energy consumption of the drying process, improve the sensory, physical and chemical indicators of the product, and thus improve the product quality.

[0054] In the description of the present invention, it is necessary to understand that the terms "middle", "length", "up", "down", "front", "back", "vertical", "horizontal", "inside", "outside", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0055] In the present invention, unless otherwise clearly specified and limited, the first feature "on" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] The above is only for explaining the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention without creative work should be included in the protection scope of the present invention.

Claims

1. A method for uniform air supply in a top-wind preserved fruit drying oven, characterized in that: The method is applied to a uniform air supply device of a top-wind preserved fruit drying box. The uniform air supply device of the top-wind preserved fruit drying box comprises a central processing unit, an airflow circulation control unit, a flow guide device and a flow guide control unit; The central processing unit is respectively connected to the airflow circulation control unit and the flow diversion control unit; The flow diversion device is connected to the flow diversion control unit; The airflow circulation control unit is used to control the wind direction switching and wind speed according to the airflow circulation direction switching time and airflow circulation wind speed set by the central processor; The diversion control unit includes a servo drive mechanism and a reduction box, the servo drive mechanism is connected to the reduction box, and the servo drive mechanism is a high-temperature servo motor; the diversion control unit is used to control the diversion device to reciprocate according to the displacement rate of the diversion device set by the central processor; The central processing unit is used to set the fixed output position of the guide device according to the drying process requirements; The guide device includes a support frame, a guide plate I, a guide plate II, a ball screw, a screw nut, a coupling and a bearing seat, the top of the support frame is connected to the servo drive mechanism, the guide plate I and the guide plate II are respectively connected to the ball screw, the ball screw is connected to the screw nut, and the coupling is respectively connected to the reduction box and the bearing seat; The reduction box is a worm gear reduction box, the guide plate I and the guide plate II are arc-shaped guide plates, and the ball screw includes a longitudinal ball screw and a transverse ball screw. The longitudinal ball screw is driven to make the screw nut connected to the guide plate move up and down or be fixed to a certain height position, and the transverse ball screw is driven to make the screw nuts at both ends of the guide plate move up and down synchronously, and finally the position and displacement rate of the guide plate I and the guide plate II in the guide device are fed back to the central processor; The method comprises: Query the airflow circulation direction switching time t and airflow circulation wind speed V a ; Determine whether the airflow circulation direction switching time t reaches a preset time, wherein the preset time is set according to the time set by the central processor; If yes, the airflow circulation control unit is driven to switch the wind direction and continuously output the airflow circulation wind speed V a ; Determine whether the output position of the diversion device is fixed; If yes, then query the position values ​​of guide plate I and guide plate II in the guide device and output the positioning drive to the central processor; If not, query the displacement rates V1 and V2 of the guide plate I and guide plate II in the guide device; When the circulating fan is running, determine whether the position and displacement rate of guide plate I and guide plate II are the same; If so, the guide plates on one or both sides of the top-wind dried fruit drying box are controlled to reciprocate in the vertical direction according to the circulation direction of the fan, so that the airflow flows evenly over the surface of the dried fruit material within a period of time; According to the process requirements of different stages of the drying process, the fixed output positions L1 and L2 of the guide plate I and the guide plate II in the guide device are set; The guide plate is driven according to the fixed output position to supply air evenly based on the fixed output position, so that the flow rate and time of the circulating airflow through different material layers in the height direction of the entire drying process are close, thereby increasing the moisture uniformity of the preserved fruit product.

2. The uniform air supply method of the top-wind preserved fruit drying oven according to claim 1, characterized in that: The airflow circulation control unit includes an axial flow circulation fan and a drive control unit, and the axial flow circulation fan is connected to the drive control unit.

3. The uniform air supply method of the top-wind preserved fruit drying box according to claim 2, characterized in that: At least one axial flow circulation fan is provided.

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