Improved tunnel type sterilizing dryer

Abstract

The utility model discloses an improved tunnel type sterilizing dryer which comprises a preheating section, a heating section and a cooling section which are connected in sequence, and further comprises a controller unit, the heating section is provided with an air supplement assembly and a pressure gradient monitoring unit, and the output end of the pressure gradient monitoring unit is connected with the input end of the controller unit. The output end of the controller unit is connected with the control end of the air supplementing assembly so as to adjust the air inlet volume of the heating section, the heating assembly and an air supplementing opening are formed in the side wall of the high-temperature box body of the heating section, the air supplementing opening is formed below the heating assembly, and an air supplementing fan of the air supplementing assembly is in butt joint with the air supplementing opening. The air inlet volume of the heating section can be accurately and effectively controlled.

Description

Technical Field

[0001] The utility model relates to the field of food and pharmaceutical packaging sterilization, in particular to an improved tunnel type sterilization dryer. Background Art

[0002] The tunnel-type sterilization dryer includes a preheating section, a heating section and a cooling section connected in sequence in the washing and drying room. At present, the pressure difference of the tunnel-type sterilization dryer is relatively low when it is idling, which is a slight positive pressure, generally between 2-10pa. This pressure difference has a small redundancy. During the entire production process, there is a risk that the pressure difference in the washing and drying room will flow back into the preheating zone and cooling zone, or that the preheating zone and cooling zone will exceed the pressure difference in the heating zone.

[0003] In order to solve the above problems, existing tunnel-type sterilization dryers generally set laminar flow fans or exhaust fans in multiple functional sections of the preheating section, heating section and cooling section to maintain the pressure gradient. However, since the heating section air supply adopts the state of natural suction, and the laminar flow fan of the heating section is in a fixed mode to ensure the reproducibility of relevant performance parameters during the production process, it is impossible to effectively control the air volume of the heating section. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the above-mentioned problems in the prior art, an improved tunnel-type sterilizing dryer is provided, which can accurately and effectively control the air volume of the heating section.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] An improved tunnel-type sterilizing dryer comprises a preheating section, a heating section and a cooling section connected in sequence, and also comprises a controller unit. The heating section is provided with an air supply component and a pressure gradient monitoring unit. The output of the pressure gradient monitoring unit is connected to the input end of the controller unit. The output end of the controller unit is connected to the control end of the air supply component to adjust the air intake volume of the heating section. The high-temperature box side wall of the heating section is provided with a heating component and an air supply port. The air supply port is arranged below the heating component, and the air supply fan of the air supply component is connected to the air supply port.

[0007] Furthermore, each of the preheating section, heating section and cooling section is provided with an air inlet component and a pressure gradient monitoring unit, and the output end of each pressure gradient monitoring unit is connected to the input end of the controller unit. The heating section and the cooling section are respectively provided with an exhaust component, and the output end of the controller unit is respectively connected to the control end of the air inlet component and the exhaust component to change the pressure gradient value of the preheating section, the heating section or the cooling section.

[0008] Furthermore, the air intake component includes an electrically connected first fan and a first frequency converter, the first fan is arranged in the corresponding preheating section or heating section or cooling section, the exhaust component includes an electrically connected second fan and a second frequency converter, the second fan is arranged outside the corresponding heating section or cooling section, the supply air component also includes a supply air fan frequency converter electrically connected to the supply air fan, and the output end of the controller unit is respectively connected to the control ends of the first frequency converter, the second frequency converter, and the supply air fan frequency converter, so that the first frequency converter, the second frequency converter, and the supply air fan frequency converter are controlled to adjust the corresponding first fan, second fan, and supply air fan speeds.

[0009] Furthermore, the pressure gradient monitoring unit includes a pressure transmitter, a first collection point is provided in the preheating section, the heating section and the cooling section, a second collection point is provided outside the tunnel-type sterilization dryer, the first collection end of the pressure transmitter is arranged at the corresponding first collection point, the second collection end of the pressure transmitter is arranged at the second collection point, and the output end of the pressure transmitter is connected to the input end of the controller unit.

[0010] Furthermore, a first air inlet is provided on the top of the preheating box of the preheating section, and a corresponding first fan and a preheating air hood are provided inside the preheating box, the air inlet of the first fan faces the first air inlet, and the air outlet of the first fan is connected to the preheating air hood, so that the first air inlet, the first fan and the preheating air hood form an external circulation air duct.

[0011] Furthermore, the first air inlet is provided with a preheating coarse-effect filter, and the air outlet of the preheating air hood is provided with a preheating high-efficiency filter.

[0012] Furthermore, a corresponding first fan, return air frame and heating section hood are provided inside the high-temperature box body, the air inlet of the heating section hood is connected to the air outlet of the first fan, the air outlet of the heating section hood faces the air inlet of the return air frame, and the heating component is arranged in the channel between the air supply port and the air outlet of the return air frame and the air inlet of the first fan, so that the first fan, the heating section hood and the return air frame form an internal circulation air duct and the air flowing into the first fan is heated by the heating component, and at the same time, the external air inhaled by the air supply fan enters the internal circulation air duct through the air supply port, the high-temperature box body is also connected to the first exhaust duct, the air outlet of the return air frame is also connected to the air inlet of the first exhaust duct, and the first exhaust duct is provided with a corresponding second fan.

[0013] Furthermore, the air outlet of the heating section air hood is provided with a high-temperature and high-efficiency filter.

[0014] Furthermore, a second air inlet is provided on the cooling box of the cooling section, a corresponding first fan and a cooling section air hood are provided in the cooling box, the cooling box is also connected to a second exhaust duct, a corresponding second fan is provided on the second exhaust duct, the second air inlet faces the air inlet of the first fan, the air outlet of the first fan is connected to the air inlet of the cooling section air hood, and the air outlet of the cooling section air hood faces the air inlet of the second exhaust duct, so that the second air inlet, the first fan, the cooling section air hood and the second exhaust duct form an external circulation air duct.

[0015] Furthermore, the second air inlet is provided with a cooling section coarse-effect filter, and the air outlet of the cooling section air hood is also provided with a cooling section high-efficiency filter.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] The utility model arranges an air supply port below the side wall of the high-temperature box in the heating section, which can utilize the effect of hot air sinking to better mix fresh air with the hot air inside the high-temperature box, thereby improving the uniformity of heating.

[0018] The utility model arranges an air supply component in the heating section. The air supply fan of the air supply component is connected to the air supply port arranged below the side wall of the high-temperature box of the heating section. Compared with the natural suction method, the air intake volume of the air supply port can be adjusted as needed, thereby realizing effective control of the air intake volume of the heating section, and can more effectively replenish fresh air into the heating section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic longitudinal section diagram of the whole tunnel-type sterilizing and drying machine according to an embodiment of the utility model.

[0020] Figure 2 This is a schematic diagram of the electrical structure of the tunnel-type sterilizing dryer according to an embodiment of the utility model.

[0021] Figure 3 It is a schematic cross-sectional view of the preheating section of the tunnel-type sterilizing and drying machine according to an embodiment of the utility model.

[0022] Figure 4 It is a schematic cross-sectional view of the heating section of the tunnel-type sterilizing and drying machine according to an embodiment of the utility model.

[0023] Figure 5 It is a schematic cross-sectional view of the cooling section of the tunnel-type sterilizing dryer according to an embodiment of the utility model.

[0024] Legend: 1- preheating section, 2- heating section, 3- cooling section, 4- container medicine bottle, 5- bottle conveying mesh belt, 11- preheating coarse filter, 12- preheating laminar flow fan, 13- preheating air hood, 14- preheating high efficiency filter, 15- preheating box, 21- high temperature laminar flow fan, 22- heating component, 23- air supply fan, 24- high temperature box, 25- return air frame, 26- heating section exhaust fan, 27- first exhaust duct, 28- high temperature and high efficiency filter, 29- heating air hood, 31- cooling laminar flow fan, 32 -Cooling section air inlet, 33-Cooling section coarse-effect filter, 34-Second exhaust duct, 35-Cooling box, 36-Cooling high-efficiency filter, 37-Cooling air hood, 38-Cooling section exhaust fan, 41-Preheating section laminar flow fan inverter, 42-Heating section laminar flow fan inverter, 43-Cooling section laminar flow fan inverter, 44-Supplementary air fan inverter, 45-Cooling section exhaust fan inverter, 46-Controller unit, 47-Preheating section pressure transmitter, 48-Heating section pressure transmitter, 49-Cooling section pressure transmitter. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0026] like Figure 1 As shown, this embodiment proposes an improved tunnel sterilization dryer, including a preheating section 1, a heating section 2 and a cooling section 3 connected in sequence, and a bottle conveying mesh belt 5 passes through the preheating section 1, the heating section 2 and the cooling section 3 in sequence, so that the containers 4 on the bottle conveying mesh belt 5 are sterilized and dried in the preheating section 1, the heating section 2 and the cooling section 3 in sequence.

[0027] like Figure 2 and Figure 4 As shown, in order to effectively control the air volume entering the heating section 2, the tunnel-type sterilizing dryer of the present embodiment further includes a controller unit 46, and the heating section 2 is provided with an air supply component and a pressure gradient monitoring unit, the output of the pressure gradient monitoring unit is connected to the input end of the controller unit 46, and the output end of the controller unit 46 is connected to the control end of the air supply component to adjust the air volume entering the heating section 2.

[0028] Specifically, the air supply component includes an air supply fan 23 and an air supply fan inverter 44 which are electrically connected. The side wall of the high temperature box 24 of the heating section 2 is provided with a heating component 22 and an air supply port. The air supply port is arranged below the heating component 22. The effect of hot air sinking can be utilized to better mix fresh air with the hot air inside the high temperature box, thereby improving the uniformity of heating. The air supply fan 23 is connected to the air supply port, and the output end of the controller unit 46 is connected to the control end of the air supply fan inverter 44, so that the controller unit 46 can adjust the frequency of the air supply fan inverter 44 according to the information fed back by the pressure gradient monitoring unit of the heating section 2. The air supply fan inverter 44 adjusts the rotation speed of the air supply fan 23 according to the adjusted frequency, thereby adjusting the air intake of the air supply port of the heating section 2.

[0029] In order to control the internal pressure balance of each functional section, each of the preheating section 1, heating section 2 and cooling section 3 of the present embodiment is provided with an air inlet component and a pressure gradient monitoring unit, and the output end of each pressure gradient monitoring unit is connected to the input end of the controller unit 46. The heating section 2 and the cooling section 3 are respectively provided with an exhaust component, and the output end of the controller unit 46 is respectively connected to the control end of the air inlet component and the exhaust component to change the pressure gradient value of the preheating section 1, the heating section 2 or the cooling section 3, while satisfying that the pressure gradient value of the heating section 2 is greater than that of the preheating section 1 and the cooling section 3.

[0030] In this embodiment, the air intake component includes an electrically connected first fan and a first frequency converter, and the first fan is arranged in the corresponding preheating section 1 or heating section 2 or cooling section 3. The exhaust component includes an electrically connected second fan and a second frequency converter, and the second fan is arranged outside the corresponding heating section 2 or cooling section 3. The output end of the controller unit 46 is respectively connected to the control end of the first frequency converter and the second frequency converter, so that the first frequency converter and the second frequency converter are controlled to adjust the corresponding first fan and second fan speeds to maintain the wind pressure balance of the preheating section 1, the heating section 2, and the cooling section 3.

[0031] like Figure 2 As shown, in this embodiment:

[0032] The first fan includes: a preheating laminar flow fan 12, a high temperature laminar flow fan 21, and a cooling laminar flow fan 31;

[0033] The first frequency converter includes: a preheating section laminar flow fan frequency converter 41, a heating section laminar flow fan frequency converter 42, and a cooling section laminar flow fan frequency converter 43;

[0034] The second fan includes: a heating section exhaust fan 26 (not shown in the figure) and a cooling section exhaust fan 38;

[0035] The second frequency converter includes: a heating section exhaust fan frequency converter (not shown in the figure) and a cooling section exhaust fan frequency converter 45.

[0036] The pressure gradient monitoring unit in this embodiment includes a pressure transmitter, such as Figure 2 As shown, a first collection point is provided in the preheating section 1, the heating section 2 and the cooling section 3, a second collection point is provided outside the tunnel-type sterilization dryer, a first collection end of the pressure transmitter is provided at the corresponding first collection point, a second collection end of the pressure transmitter is provided at the second collection point, and an output end of the pressure transmitter is connected to an input end of a controller unit 46.

[0037] like Figure 2 As shown, the pressure transmitter in this embodiment includes: a preheating section pressure transmitter 47, a heating section pressure transmitter 48, and a cooling section pressure transmitter 49. The first collection end of the preheating section pressure transmitter 47 is set at the first collection point in the preheating section 1, and the second collection end is set at the second collection point corresponding to the preheating section 1 of the washing and drying room outside the tunnel-type sterilizing and drying machine. The first collection end of the heating section pressure transmitter 48 is set at the first collection point in the heating section 2, and the second collection end is set at the second collection point corresponding to the heating section 2 of the washing and drying room outside the tunnel-type sterilizing and drying machine. The first collection end of the cooling section pressure transmitter 49 pressure transmitter is set at the first collection point in the cooling section 3, and the second collection end is set at the second collection point corresponding to the cooling section 3 of the canning room outside the tunnel-type sterilizing and drying machine.

[0038] Through the above structure, after the controller unit 46 obtains the pressure data fed back from the preheating section pressure transmitter 47, the high temperature section pressure transmitter 48, and the cooling section pressure transmitter 49 in real time, it can simultaneously or separately adjust the frequencies of the preheating section laminar flow fan inverter 41, the heating section laminar flow fan inverter 42, the cooling section laminar flow fan inverter 43, the heating section exhaust fan inverter, and the cooling section exhaust fan inverter 45, thereby realizing the speed control of the preheating laminar flow fan 12, the high temperature laminar flow fan 21, the cooling laminar flow fan 31, the heating section exhaust fan 26, and the cooling section exhaust fan 38, thereby performing wind pressure balance control on the preheating section 1, the heating section 2, and the cooling section 3, respectively.

[0039] The controller unit 46 in this embodiment can adopt a PLC controller with a human machine interface (Human Machine Interface, HMI), which has the characteristics of strong versatility, easy use, wide adaptability, high reliability, strong anti-interference ability, and simple programming.

[0040] The wind flow of the preheating section 1 in this embodiment adopts an external circulation mode. Figure 3As shown, in this embodiment, a first air inlet is provided on the top of the preheating box 15 of the preheating section 1, and a preheating laminar flow fan 12 and a preheating air hood 13 are provided inside the preheating box 15. The air inlet of the preheating laminar flow fan 12 faces the first air inlet, and the air outlet of the preheating laminar flow fan 12 is connected to the preheating air hood 13, so that the first air inlet, the preheating laminar flow fan 12 and the preheating air hood 13 form an external circulation air duct. The first air inlet is provided with a preheating coarse-effect filter 11, and the air outlet of the preheating air hood 13 is provided with a preheating high-efficiency filter 14 to fully filter impurities such as dust.

[0041] Through the above structure, the air entering from the first air inlet enters the negative pressure chamber where the preheating laminar flow fan 12 is located after preliminary filtration by the preheating coarse filter assembly 11, enters the preheating air hood 13 under the adsorption load of the preheating laminar flow fan 12 and is evenly and vertically blown toward the preheating high-efficiency filter 14, and the laminar air after high-efficiency filtration is vertically blown toward the container medicine bottle 4 moving above the bottle conveying mesh belt 5. At the same time, the controller unit 46 adjusts the speed of the preheating laminar flow fan 12 through the preheating section laminar flow fan inverter 41 according to the pressure data fed back by the preheating section pressure transmitter 47, so as to ensure that the pressure of the preheating section 1 is balanced and the pressure difference of the heating section 2 is greater than that of the preheating section 1.

[0042] In this embodiment, the air flow of the heating section 2 adopts an internal circulation mode. Figure 4 As shown, in this embodiment, a high-temperature laminar flow fan 21, a heating component 22, a return air frame 25 and a heating section hood 29 are arranged inside the high-temperature box body 24 of the heating section 2. The air inlet of the heating section hood 29 is connected to the air outlet of the high-temperature laminar flow fan 21, and the air outlet of the heating section hood 29 faces the air inlet of the return air frame 25. The heating component 22 is arranged in the channel between the air supply port and the air outlet of the return air frame 25 and the air inlet of the high-temperature laminar flow fan 21, so that the high-temperature laminar flow fan 21, the heating section hood 29 and the return air frame 25 form an internal circulation air duct and the air flowing into the high-temperature laminar flow fan 21 is heated by the heating component 22. At the same time, the external air inhaled by the air supply fan 23 enters the internal circulation air duct through the air supply port. The high-temperature box body 24 is also connected to a first exhaust duct 27, and the air outlet of the return air frame 25 is also connected to the air inlet of the first exhaust duct 27. The first exhaust duct 27 is provided with a heating section exhaust fan 26. The air outlet of the heating section air cover 29 is provided with a high-temperature and high-efficiency filter 28 to fully filter out impurities such as dust.

[0043] Through the above structure, the air supply fan 23 forcibly inhales air and a large amount of internal circulation air, which are heated by the heating component 22 and then enter the heating section wind cover 29 under the adsorption load of the high-temperature laminar flow fan 21 and blow vertically to the high-temperature and high-efficiency filter 28. The laminar air after high-efficiency filtration blows vertically to the container medicine bottle 4 moving above the bottle conveying mesh belt 5 to dry and sterilize it to remove the heat source. After that, the laminar air passes through the return air frame 25 and enters the next operation cycle. Considering that the air inhaled by the air supply port and the cold and hot mixture of the air inside the heating section 2 may cause high air humidity, a heating section exhaust fan 26 is set at the bottom of the heating section 2 to discharge part of the high-temperature and high-humidity air through the first exhaust duct 27, and also assists in adjusting the pressure difference of the heating section 2. At the same time, the controller unit 46 can adjust the speed of the high-temperature laminar flow fan 21, the heating section exhaust fan 26, and the make-up air fan 23 respectively according to the pressure data fed back by the heating section pressure transmitter 48 through the heating section laminar flow fan inverter 42, the heating section exhaust fan inverter, and the make-up air fan inverter 44, thereby ensuring that the pressure in the heating section 2 is balanced and the pressure difference is greater than that in the preheating section 1 and the cooling section 3.

[0044] The wind flow of the cooling section 3 of this embodiment adopts an external circulation mode. Figure 5 As shown, in this embodiment, the cooling box 35 of the cooling section 3 is provided with a second air inlet, which is Figure 5 The cooling section air inlet 32 ​​in the cooling box 35 is provided with a cooling laminar flow fan 31 and a cooling section air hood 37. The cooling box 35 is also connected to a second exhaust duct 34. A cooling section exhaust fan 38 is provided on the second exhaust duct 34. The cooling section air inlet 32 ​​faces the air inlet of the cooling laminar flow fan 31. The air outlet of the cooling laminar flow fan 31 is connected to the air inlet of the cooling section air hood 37. The air outlet of the cooling section air hood 37 faces the air inlet of the second exhaust duct 34, so that the cooling section air inlet 32, the cooling laminar flow fan 31, the cooling section air hood 37 and the second exhaust duct 34 form an external circulation air duct. The cooling section air inlet 32 ​​is provided with a cooling section coarse-effect filter 33, and the air outlet of the cooling section air hood 37 is also provided with a cooling section high-efficiency filter 36 to fully filter dust and other impurities.

[0045] Through the above structure, a large amount of cold air enters from the cooling section air inlet 32, and after preliminary filtration by the cooling section coarse filter 33, enters the cooling section hood 37 under the adsorption load of the cooling laminar flow fan 31 and blows vertically to the cold cooling section high efficiency filter 36. The laminar air after high efficiency filtration blows vertically to the container medicine bottle 4 moving above the bottle conveying mesh belt 5, and performs a process of cooling and lowering the temperature. Thereafter, the air is discharged from the cooling box 35 through the second exhaust duct 34 under the action of the cooling section exhaust fan 38. At the same time, the controller unit 46 can adjust the speed of the cooling laminar flow fan 31 and the cooling section exhaust fan 38 through the cooling section laminar flow fan inverter 43 and the cooling section exhaust fan inverter 45 according to the pressure data fed back by the cooling section pressure transmitter 49, so as to ensure that the pressure of the cooling section 3 is balanced and the pressure difference of the heating section 2 is greater than that of the cooling section 3.

[0046] In this embodiment, the first collection point of the preheating section 1 is located 150 mm below the preheating high-efficiency filter 14, the first collection point of the heating section 2 is located 150 mm below the high-temperature high-efficiency filter 28, and the first collection point of the cooling section 3 is located 150 mm below the cooling high-efficiency filter 36.

[0047] The following is a description of the whole machine wind pressure balance control process of the tunnel type sterilizing dryer of this embodiment and the adjustment process under different working conditions:

[0048] S1 (no-load state): After the whole machine is installed, the frequency of the heating section exhaust fan inverter and the cooling section exhaust fan inverter 45 are adjusted to the appropriate value within their working range (that is, in the subsequent adjustment, it can be ensured that the corresponding heating section exhaust fan 26 and the cooling section exhaust fan 38 have adjustable space up and down) and S1 remains unchanged at this stage. At this time, the room pressure of the washing and drying room and the working pressure of the filling room are adjusted to the state during normal production. The working frequencies of the preheating laminar flow fan 12, the high-temperature laminar flow fan 21, the cooling laminar flow fan 31 and the air supply fan 23 are adjusted through the pressure difference display fed back by the preheating section pressure transmitter 47, the heating section pressure transmitter 48 and the cooling section pressure transmitter 49, so that the whole system can reach an initial design gradient of wind pressure balance that meets the hundred-level laminar flow. When the balance gradient is stable, the operating frequency of the heating section laminar flow fan inverter 42 will no longer change, including the following steps:

[0049] S11: Set the pressure difference range (10Pa-25Pa) between the preheating section 1 and the room, and use the pressure difference monitored by the preheating section pressure transmitter 47 to operate the controller unit 46 to adjust the frequency of the preheating section laminar flow fan inverter 41 to adjust the air volume of the preheating laminar flow fan 12 until the pressure of the preheating section 1 is within the set range.

[0050] S12: Set the pressure difference range (12Pa-25Pa) between the heating section 2 and the room, and monitor the pressure difference through the heating section pressure transmitter 48. Operate the controller unit 46 to adjust the frequency of the heating section laminar flow fan inverter 42 and the make-up air fan inverter 44 to adjust the air volume of the high-temperature laminar flow fan 21 and the make-up air fan 23, until the pressure of the heating section 2 is within the set range and the pressure of the heating section 2 is greater than that of the preheating section 1 and the cooling section 3.

[0051] S13: Set the pressure difference range (12Pa-25Pa) between the cooling section 3 and the room, and use the pressure difference monitored by the cooling section pressure transmitter 49 to operate the controller unit 46 to adjust the frequency of the cooling section laminar flow fan inverter 43 to adjust the air volume of the cooling laminar flow fan 31 until the pressure of the cooling section 3 is within the set range.

[0052] It should be noted that when adjusting the frequency of each laminar flow fan here, not all fans are gradually adjusted within the range of 0-50HZ. The debugging personnel can adjust the working frequency of each fan to a reasonable frequency based on previous experience and then make fine adjustments.

[0053] S2: When normal production is completed after debugging, the bottle feeding stage begins. The initial operating frequencies of the preheating laminar flow fan 12, the high-temperature laminar flow fan 21, and the cooling laminar flow fan 31 remain unchanged. According to the bottle feeding position and the gradient difference between the heating zone 1 and the preheating zone 2 (positive value greater than 0), and the gradient difference between the heating zone 2 and the cooling zone 3 (positive value greater than 0), the operating frequencies of the preheating laminar flow fan 12 and the cooling laminar flow fan 31 and the frequency or the opening and closing degree of the air valve of the cooling section exhaust fan 38 are automatically adjusted to maintain the internal pressure gradient balance. The specific working conditions are as follows:

[0054] S21: Bottle feeding stage:

[0055] The bottle feeding stage of production is a process from empty (no bottles on the mesh belt) to full load (bottles on the mesh belt), and the heating inlet damper SV1, the heating outlet damper SV2, and the oven outlet damper SV3 are from closed to open.

[0056] When the bottles start to be fed in, the heating inlet damper SV1 is closed. The laminar air blown down by the preheating laminar flow fan 12 is blocked by the bottles on the bottle conveying mesh belt 5, so that the pressure difference in the preheating section 1 gradually increases. The preheating section pressure transmitter 47 monitors that the pressure difference between the preheating section 1 and the room is higher than the pressure difference in the heating section 2, resulting in backflow, that is, the pressure difference in the preheating section 1 is greater than that in the heating section 2. In order to maintain the pressure difference between the preheating section 1 and the room greater than 10Pa and the pressure in the heating section 2 greater than that in the preheating section 1, the operation controller unit 46 controls the preheating laminar flow fan 12 to reduce its speed; when the preheating section pressure transmitter 47 monitors that the pressure difference between the preheating section 1 and the room is greater than that in the heating section 2, the pressure difference between the preheating section 1 and the room is greater than that in the preheating section 1, the operation controller unit 46 controls the preheating laminar flow fan 12 to reduce its speed; When the room pressure difference is lower than 10Pa (open the plexiglass door in the preheating area and release the chain) and the pressure in heating zone 2 is greater than that in preheating zone 1, the operation controller unit 46 controls the preheating laminar flow fan 12 to increase the speed, reduce the exhaust air volume, maintain the preheating pressure difference greater than 10Pa and ensure that the pressure in heating zone 2 is greater than that in preheating zone 1; when the preheating section pressure transmitter 47 monitors that the pressure difference between the preheating section and the room is higher than 10Pa but the gradient difference between heating zone 2 and preheating zone 1 is less than the set value (1Pa), the operation controller unit 46 controls the preheating laminar flow fan 12 to reduce the speed and increase the gradient difference between the two.

[0057] When the bottles on the bottle conveying mesh belt 5 are conveyed to the oven outlet and the oven outlet damper SV3 is opened, the air volume in the filling room is poured into the cooling section 3, so that the pressure difference in the cooling zone 3 is greater than that in the heating zone 2. At this time, the operation controller unit 46 increases the frequency of the cooling section exhaust fan inverter 45 or the opening and closing degree of the air valve to remove the excess air volume, and maintains the pressure difference in the heating zone 2 greater than that in the cooling zone 3 and greater than 10Pa. When the pressure difference in the cooling zone is less than 10Pa and the gradient of the two is less than the set value (1-2Pa), the operation controller unit 46 reduces the frequency of the cooling section exhaust fan inverter 45 or the opening and closing degree of the air valve to maintain the pressure difference in the heating zone 2 greater than that in the cooling zone 3 and greater than 10Pa.

[0058] S22: Tail bottle emptying stage:

[0059] The stage of emptying the last bottles of production is a process from full load (there are bottles on the mesh belt) to empty load (no bottles on the mesh belt), and the heating inlet damper SV1, the heating outlet damper SV2, and the oven outlet damper SV3 are from opening to closing.

[0060] When emptying begins, the bottles on the bottle conveying mesh belt 5 are gradually emptied, and the pressure difference between each zone decreases. Therefore, in order to maintain the original pressure gradient value (positive pressure) of each zone and the gradient value (greater than 10Pa) between each zone and the room, the operation controller unit 46 controls the preheating laminar flow fan 12 to increase the speed, increase the exhaust air volume, and avoid preheating pressure difference fluctuations; when the bottles follow the mesh belt through the heating inlet damper SV1 and completely enter the heating zone 2, the preheating zone 1 is in an unloaded state and the pressure decreases. In order to maintain the pressure difference greater than 10Pa, the operation controller unit 46 controls the preheating laminar flow fan 12 to increase the speed, and maintain the pressure difference between the preheating zone 1 and the room. Similarly, when the bottles are emptied through the heating section 2 and the cooling section 3, the pressure difference monitored by the heating section pressure transmitter 48 and the cooling section pressure transmitter 49 also changes and fluctuates as the bottles are emptied; when the bottles are emptied to the front of the oven outlet damper SV3 at the rear of the cooling section 3, there is no cooling laminar flow fan 31 and the wind from the filling room that can be blocked after the bottles are emptied. At this time, the cooling section pressure transmitter 49 detects that the pressure difference of the cooling section 3 may be greater than the pressure difference of the heating zone 2. At this time, the operation controller unit 46 increases the frequency of the cooling section exhaust fan inverter 45 to increase the exhaust volume, reduce the pressure difference between the cooling zone 3 and the room, avoid pressure difference fluctuations, and meet the control requirements. When the bottles are emptied, the oven outlet damper SV3 is closed, and the operation controller unit 46 controls the cooling laminar flow fan 31 to restore the original set speed. At this time, it is restored to the no-load state and executed according to the no-load state, thereby completing the process control of the entire production process.

[0061] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An improved tunnel sterilizing dryer, characterized in that: The invention comprises a preheating section (1), a heating section (2) and a cooling section (3) which are connected in sequence, and also comprises a controller unit (46); the heating section (2) is provided with an air supply component and a pressure gradient monitoring unit; the output of the pressure gradient monitoring unit is connected to the input end of the controller unit (46); the output end of the controller unit (46) is connected to the control end of the air supply component to adjust the air intake volume of the heating section (2); the side wall of the high temperature box (24) of the heating section (2) is provided with a heating component (22) and an air supply port; the air supply port is arranged below the heating component (22), and the air supply fan (23) of the air supply component is connected to the air supply port.

2. The improved tunnel sterilizing dryer according to claim 1, characterized in that: Each of the preheating section (1), the heating section (2) and the cooling section (3) is provided with an air inlet component and a pressure gradient monitoring unit, and the output end of each pressure gradient monitoring unit is connected to the input end of a controller unit (46). The heating section (2) and the cooling section (3) are respectively provided with an exhaust component, and the output end of the controller unit (46) is respectively connected to the control end of the air inlet component and the exhaust component to change the pressure gradient value of the preheating section (1), the heating section (2) or the cooling section (3).

3. The improved tunnel sterilizing dryer according to claim 2, characterized in that: The air intake assembly comprises an electrically connected first fan and a first frequency converter, wherein the first fan is arranged in the corresponding preheating section (1) or heating section (2) or cooling section (3); the air exhaust assembly comprises an electrically connected second fan and a second frequency converter, wherein the second fan is arranged outside the corresponding heating section (2) or cooling section (3); the air supply assembly also comprises an air supply fan frequency converter (44) electrically connected to the air supply fan (23); the output end of the controller unit (46) is respectively connected to the control ends of the first frequency converter, the second frequency converter and the air supply fan frequency converter (44), so that the first frequency converter, the second frequency converter and the air supply fan frequency converter (44) are controlled to adjust the rotation speeds of the corresponding first fan, the second fan and the air supply fan (23).

4. The improved tunnel sterilizing dryer according to claim 2, characterized in that: The pressure gradient monitoring unit comprises a pressure transmitter, a first collection point is provided in each of the preheating section (1), the heating section (2) and the cooling section (3), a second collection point is provided outside the tunnel-type sterilizing dryer, a first collection end of the pressure transmitter is arranged at the corresponding first collection point, a second collection end of the pressure transmitter is arranged at the second collection point, and an output end of the pressure transmitter is connected to an input end of a controller unit (46).

5. The improved tunnel sterilizing dryer according to claim 3, characterized in that: A first air inlet is provided at the top of the preheating box (15) of the preheating section (1), and a corresponding first fan and a preheating air hood (13) are provided inside the preheating box (15), the air inlet of the first fan faces the first air inlet, and the air outlet of the first fan is connected to the preheating air hood (13), so that the first air inlet, the first fan and the preheating air hood (13) form an external circulation air duct.

6. The improved tunnel sterilizing dryer according to claim 5, characterized in that: The first air inlet is provided with a preheating coarse-effect filter (11), and the air outlet of the preheating air cover (13) is provided with a preheating high-efficiency filter (14).

7. The improved tunnel sterilizing dryer according to claim 3, characterized in that: The high temperature box (24) is provided with a corresponding first fan, a return air frame (25) and a heating section hood (29). The air inlet of the heating section hood (29) is connected to the air outlet of the first fan, and the air outlet of the heating section hood (29) faces the air inlet of the return air frame (25). The heating component (22) is arranged in the passage between the air supply port and the air outlet of the return air frame (25) and the air inlet of the first fan, so that the first fan, the heating section hood (29) and the return air frame (25) form an internal circulation air duct and the air flowing into the first fan is heated by the heating component (22). At the same time, the external air sucked in by the air supply fan (23) enters the internal circulation air duct through the air supply port. The high temperature box (24) is also connected to a first exhaust duct (27). The air outlet of the return air frame (25) is also connected to the air inlet of the first exhaust duct (27). The first exhaust duct (27) is provided with a corresponding second fan.

8. The improved tunnel sterilizing dryer according to claim 7, characterized in that: The air outlet of the heating section air cover (29) is provided with a high-temperature and high-efficiency filter (28).

9. The improved tunnel sterilizing and drying machine according to claim 3, characterized in that: A second air inlet is provided on the cooling box (35) of the cooling section (3), a corresponding first fan and a cooling section air hood (37) are provided in the cooling box (35), the cooling box (35) is also connected to a second exhaust duct (34), a corresponding second fan is provided on the second exhaust duct (34), the second air inlet faces the air inlet of the first fan, the air outlet of the first fan is connected to the air inlet of the cooling section air hood (37), the air outlet of the cooling section air hood (37) faces the air inlet of the second exhaust duct (34), so that the second air inlet, the first fan, the cooling section air hood (37) and the second exhaust duct (34) form an external circulation air duct.

10. The improved tunnel sterilizing dryer according to claim 9, characterized in that: The second air inlet is provided with a cooling section coarse-effect filter (33), and the air outlet of the cooling section air cover (37) is also provided with a cooling section high-efficiency filter (36).

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