Full-automatic tunnel type closed-loop dehumidification mosquito-repellent incense drying device

Abstract

The application discloses a full-automatic tunnel type closed-loop dehumidification mosquito-repellent incense drying device, which comprises a heat-preservation drying oven and a closed-loop dehumidification heat pump dryer for providing dry hot air for the heat-preservation drying oven; a group of conveying chains are arranged on a group of opposite side walls of the heat-preservation drying oven and are arranged in a S-shaped route; mosquito-repellent incense sieve plates are horizontally arranged between the conveying chains in a movable and pivoted mode; and a weight is hung below the mosquito-repellent incense sieve plates through a soft rope. The closed-loop dehumidification heat pump dryer is used for carrying out closed-loop dehumidification and temperature rising on the drying channel of the heat-preservation drying oven, so that the device is more energy-saving, more environment-friendly and more efficient. The heat-preservation drying oven is in a tunnel type, so that the heat energy utilization rate is improved, and the mosquito-repellent incense productivity is improved. In addition, the weight can keep the mosquito-repellent incense sieve plates in a balanced state during movement, full-automatic drying is realized, and the processing efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of mosquito coil drying technology, and in particular to a fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device. Background Technology

[0002] The existing mosquito coil blanks are stamped into shape by a stamping machine and then transferred to a mosquito coil drying room for drying after demolding. After drying, the mosquito coils are collected by a coil collecting device.

[0003] In traditional techniques, mosquito coils, after being demolded, are typically manually transferred to a drying chamber for drying, and then manually transferred to a collection device. This process is inefficient and labor-intensive. Furthermore, domestic mosquito coil manufacturers generally use open-type drying systems, such as coal-fired boilers, to heat heat transfer oil. A fan carries the heat from the oil into the drying chamber, raising the temperature of the air and materials inside to the required level for drying the mosquito coils. This high temperature carries the moisture from the mosquito coils into the warm air, which is then exhausted outside the chamber. This continuous process of dehumidification and fresh air replenishment expels the moisture from the mosquito coils, thus drying them. Some manufacturers have adopted gas-fired boilers instead of coal-fired boilers. However, this process also releases high-temperature gases during dehumidification, and heating the replenished fresh air requires a continuous supply of heat, resulting in energy waste. Additionally, coal-fired boilers release harmful substances such as sulfur dioxide and dust into the atmosphere during combustion. Therefore, this process is neither energy-efficient nor environmentally friendly. Traditional techniques also employ electric drying, where the already formed, wet mosquito coils are fed into a drying duct and heated by electric heating wires to achieve the desired drying effect. Because electric drying consumes a very high amount of electricity, it not only increases the cost of mosquito coil drying but also consumes a significant amount of energy, failing to achieve good economic benefits. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide an energy-saving, environmentally friendly, efficient and fully automated tunnel-type closed-loop dehumidification mosquito coil drying device.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device includes an insulated drying chamber and a closed-loop dehumidification heat pump dryer that provides dry hot air to the insulated drying chamber. The closed-loop dehumidification heat pump dryer is located outside the insulated drying chamber. The interior of the insulated drying chamber is a drying channel for accommodating mosquito coil sieves. The closed-loop dehumidification heat pump dryer and the insulated drying chamber are connected by an air supply pipe and a return air pipe, respectively, to form a heat circulation loop.

[0007] On a set of opposite side walls of the heat-insulating drying oven, there are corresponding sets of parallel conveyor chains and drive sprockets meshing with the conveyor chains. The conveyor chains are mounted on the drive sprockets and are arranged to meander along an S-shaped route. Mosquito coil sieves are horizontally installed between the parallel conveyor chains in a movable pivoting manner. A weight is suspended below the mosquito coil sieve by a soft rope to help maintain the balance of the mosquito coil sieve during the conveying process.

[0008] The mosquito coil sieve is rectangular and has a first end and a second end. The first end and the second end are respectively pivotally connected to the conveyor chain via a rotating shaft. The weight is suspended on the mosquito coil sieve by two soft ropes, and the two soft ropes are respectively tied to the mosquito coil sieve at two positions along the central axis of the mosquito coil sieve.

[0009] The weight is positioned directly below the mosquito coil sieve, or below the first and second ends of the mosquito coil sieve, respectively.

[0010] The number of the hammers is one or more.

[0011] The heat-insulating drying oven is a tunnel-type heat-insulating drying oven, including a first side wall and a second side wall arranged opposite to each other, as well as a top wall and a bottom wall arranged opposite to each other. The first side wall, the top wall, the second side wall and the bottom wall are connected and enclosed in sequence to form the drying channel. The heat-insulating drying oven has an inlet end and an outlet end, and the inlet end and the outlet end are respectively located at both ends along the length direction of the heat-insulating drying oven.

[0012] A lifting frame is provided on one side of the insulated drying chamber at its inlet end for lifting and conveying the mosquito coil sieve tray containing the mosquito coils to be dried. The lifting frame is connected to the inlet end of the insulated drying chamber. A transition platform is provided on one side of the insulated drying chamber at its outlet end for horizontally outputting the mosquito coil sieve tray containing the dried mosquito coils. The transition platform is set corresponding to the bottom wall of the insulated drying chamber and is connected to the outlet end of the insulated drying chamber. Parallel conveying chains are respectively set on the first side wall and the second side wall and extend and are installed on the lifting frame and the transition platform.

[0013] The closed-loop dehumidifying heat pump dryer includes a compressor, an exhaust fan, a condenser for heating and drying air, and an evaporator for dehumidifying and absorbing the potential heat of the humid air. The closed-loop dehumidifying heat pump dryer is provided with a dry hot air outlet and a humid hot air return outlet. The interior of the closed-loop dehumidifying heat pump dryer has an air passage. The dry hot air outlet and the humid hot air return outlet are located at both ends of the air passage of the closed-loop dehumidifying heat pump dryer. The top wall of the heat-insulating drying chamber is provided with a dry hot air inlet and a humid hot air outlet at the positions where they connect with the dry hot air outlet and the humid hot air return outlet, respectively.

[0014] The evaporator, the compressor, and the condenser are sequentially arranged in the air passage of the closed-loop dehumidification heat pump dryer. The exhaust fan is located at the dry hot air inlet and is connected to the dry hot air outlet through the air supply pipe. The condenser is located close to the exhaust fan, and the evaporator is located away from the exhaust fan.

[0015] The evaporator is provided with a water collection tray for collecting condensate and a water guide pipe connected to the water collection tray for discharging the condensate. The water guide pipe extends from inside the closed-loop dehumidifying heat pump dryer to outside the closed-loop dehumidifying heat pump dryer.

[0016] The heat-insulating drying oven has a plurality of transmission units including the drive sprocket and the conveying chain. The closed-loop dehumidifying heat pump dryer has a plurality of heat pump units including the evaporator, the compressor and the condenser. Each heat pump unit has a plurality of compressors, and the number and power of the compressors in each heat pump unit are the same or different. Each heat pump unit is configured in one-to-one correspondence with each of the transmission units in the heat-insulating drying oven.

[0017] The heat-insulating drying oven has a plurality of transmission units including the drive sprocket and the conveying chain, and the number of closed-loop dehumidifying heat pump dryers is a plurality of units, with each closed-loop dehumidifying heat pump dryer corresponding to each transmission unit of the heat-insulating drying oven.

[0018] By adopting the above technical solution, the present invention provides a fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device. This device uses a closed-loop dehumidification heat pump dryer to perform closed-loop dehumidification and heating of the drying channel in the insulated drying chamber, drying the mosquito coils inside. Compared with traditional drying technologies, it is more energy-efficient, environmentally friendly, and highly efficient. The closed-loop dehumidification and heating system eliminates the limitations imposed by external conditions. Furthermore, during the drying process, compared to traditional tunnel drying systems, the winding conveyor chain design shortens the length of the tunnel-type insulated drying chamber, effectively saving space and increasing the total contact area between hot air and mosquito coils, thus improving the thermal energy utilization rate of the closed-loop dehumidification heat pump dryer and increasing mosquito coil production capacity. In addition, a counterweight is installed below the mosquito coil sieve to maintain its balance during movement, achieving fully automated drying with high processing efficiency. Attached Figure Description

[0019] Figure 1 This is a side view of the structure of the present invention;

[0020] Figure 2 This is a top view of the structure of the present invention (the closed-loop dehumidification heat pump dryer is omitted);

[0021] Figure 3 This is a schematic diagram of the motion trajectory of the conveyor chain in Embodiment 1 of the present invention (mosquito coil sieve tray omitted);

[0022] Figure 4 This is a schematic diagram of the motion trajectory structure of the mosquito coil sieve disc in Embodiment 1 of the present invention (with the counterweight omitted);

[0023] Figure 5 This is a schematic diagram of the structure of the mosquito coil sieve disc in this invention;

[0024] Figure 6 This is a schematic diagram of the motion trajectory structure of the conveyor chain in Embodiment 2 of the present invention;

[0025] Figure 7 This is a side view of the structure of Embodiment 4 of the present invention.

[0026] In the picture:

[0027] Insulated drying oven-1; First side wall-11;

[0028] Second sidewall-12; Transmission sprocket-13

[0029] First sprocket - 131; Second sprocket - 132;

[0030] Conveyor chain-14; Drive sprocket-15;

[0031] Reinforced sprocket-16; Second transition sprocket-17;

[0032] Dry hot air inlet -18; Humid hot air outlet -19;

[0033] Closed-loop dehumidifying heat pump dryer-2; Compressor-21;

[0034] Exhaust fan-22; Condenser-23;

[0035] Evaporator -24; Dry hot air outlet -27;

[0036] Humidified hot air return vent -28; Mosquito coil sieve tray -3;

[0037] Shaft-31; Counterweight-4;

[0038] Lifting frame-5; First transition sprocket-51;

[0039] Transition platform-6; Air supply duct-7;

[0040] Return air duct -8; Wet mosquito coil -9;

[0041] Gear motor-10. Detailed Implementation

[0042] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0043] Example 1

[0044] This invention provides a fully automatic tunnel-type closed-loop dehumidification and mosquito coil drying device, such as... Figures 1-5 As shown, the system includes an insulated drying chamber 1 and a closed-loop dehumidifying heat pump dryer 2. The closed-loop dehumidifying heat pump dryer 2 is located outside the insulated drying chamber 1 and is connected to the insulated drying chamber 1 via an air supply duct 7 and a return air duct 8, forming a heat circulation loop, i.e., a closed-loop dehumidification loop. The interior of the insulated drying chamber 1 is a drying channel for accommodating the mosquito coil sieve tray 3, and the interior of the closed-loop dehumidifying heat pump dryer 2 has an air passage.

[0045] The insulated drying chamber 1 is a tunnel-type insulated drying chamber, including a first side wall 11 and a second side wall 12 arranged opposite to each other, as well as a top wall and a bottom wall arranged opposite to each other. The first side wall 11, the top wall, the second side wall 12, and the bottom wall are sequentially connected to form the aforementioned drying channel. A closed-loop dehumidifying heat pump dryer 2 is located outside the insulated drying chamber 1 near the first side wall 11, near the second side wall 12, or above the top wall. In this embodiment, the dehumidifying heat pump dryer 2 is located above the top wall of the insulated drying chamber 1 as an example. The insulated drying chamber 1 has an inlet end and an outlet end, which are located at opposite ends of the length direction of the insulated drying chamber 1. The insulated drying chamber 1 is equipped with at least one closed-loop dehumidifying heat pump dryer 2.

[0046] The closed-loop dehumidifying heat pump dryer 2 includes a compressor 21, an exhaust fan 22, a condenser 23, and an evaporator 24. The closed-loop dehumidifying heat pump dryer 2 has a dry hot air outlet 27 and a humidified hot air return outlet 28, located at both ends of the air passageway on the closed-loop dehumidifying heat pump dryer 2. The condenser 23 is used to heat and dry the air, and the evaporator 23 is used to dehumidify and absorb the potential heat of the humid air. The evaporator 24, compressor 21, and condenser 23 are sequentially arranged in the air passageway. The exhaust fan 22 is located at the dry hot air inlet 18 and is connected to the dry hot air outlet 27 via an air supply duct 7. The condenser 23 is located near the exhaust fan 22, the evaporator 24 is located away from the exhaust fan 22, and the compressor 21 is located between the condenser 23 and the evaporator 24. The output end of compressor 21 is connected to the input end of condenser 23, and the output end of condenser 23 is connected to the input end of evaporator 24. Evaporator 24 is provided with a water collection tray for collecting condensate and a water pipe (not shown in the figure) connected to the water collection tray for discharging the condensate. The water pipe extends from inside the closed-loop dehumidifying heat pump dryer 2 to the outside of the closed-loop dehumidifying heat pump dryer 2. In this way, evaporator 24 can absorb the potential heat of the humid air inside the insulated drying chamber 1 and then discharge the condensate outside the insulated drying chamber 1, that is, it does not discharge heat to the outside, thus avoiding energy loss.

[0047] The top wall of the insulated drying oven 1 is provided with a dry hot air inlet 18 and a humid hot air outlet 19 at the locations where they connect with the dry hot air outlet 27 and the humid hot air return outlet 2, respectively. The dry hot air outlet 27 is connected to one end of the air supply duct 7, and the other end of the air supply duct 7 is connected to the dry hot air inlet 18, that is, connected to the drying channel of the insulated drying oven 1. The two ends of the return air duct 8 are connected to the humid hot air outlet 19 and the humid hot air return outlet 28, respectively, that is, the humid hot air outlet 19 is connected to the air passage of the closed-loop dehumidifying heat pump dryer 2. The exhaust fan 22 is located at the hot air inlet 18 to ensure that the high-temperature air (i.e., hot air) generated by the heat-insulating drying chamber 1 is delivered to the drying channel of the heat-insulating drying chamber 1 through the air supply channel 7 for drying the wet mosquito coils 9. The exhaust fan 22 drives the air circulation in the heat-insulating drying chamber 1, and the exhaust fan 22 makes uniform strong air convection in the heat-insulating drying chamber 1, so that there is no water film on the surface of the wet mosquito coils 9 during drying, keeping the humidity in the heat-insulating drying chamber 1 low, ensuring that the mosquito coils do not mold or deteriorate during the drying process, and there is no need to turn the mosquito coils during drying, saving labor costs while not damaging the efficacy and appearance of the mosquito coils.

[0048] The compressor 21 of this invention uses a Copeland high-temperature compressor from the United States. It should be noted that the components and working principle of the closed-loop dehumidifying heat pump dryer 2 in this invention are all conventional technologies, as long as the closed-loop dehumidifying heat pump dryer 2 can achieve a cooling and heat release cycle. For example, the heat pump in patent number 201520505943.X, entitled "A Mosquito Coil Baking System," can be used.

[0049] The evaporator 24 comes into contact with the humidified hot air drawn into the air passage of the closed-loop dehumidifying heat pump dryer 2 from the humidified hot air return air inlet 28. The humidified hot air condenses at the evaporator 24, producing condensate. The condensate is temporarily stored in the aforementioned water collection pan, and then discharged from the water collection pan to the outside of the closed-loop dehumidifying heat pump dryer 2 in a timely manner through the aforementioned water guide pipe. The condenser 23 reheats the dehumidified air (i.e., the air that has passed through the evaporator 24). During operation, the exhaust fan 22 drives the circulation of air within the insulated drying chamber 1 (i.e., the drying channel). The air passes through the condenser 23, forming hot air that heats the damp mosquito coils 9 to be dried, removing moisture and becoming moist hot air at approximately 55°C. This hot air re-enters the closed-loop dehumidifying heat pump dryer 2 through the humid hot air return vent 28, passes through the evaporator 24, condenses to produce water droplets, falls into the water collection tray, and is discharged outside the insulated drying chamber 1 through the water pipe. The dehydrated air then passes through the condenser 23 again and is heated to form hot air. This cycle continues, continuously reducing the relative humidity within the insulated drying chamber 1 to achieve the drying purpose. In this way, the evaporator 24 absorbs heat energy, and the condenser 23 releases heat energy. During the drying process, only condensate is discharged, with no energy loss; energy is 100% recovered, resulting in high drying efficiency. Furthermore, the drying process is unaffected by external temperature and humidity, maintaining high energy efficiency year-round and suitable for any climate conditions. In addition, external dust cannot enter, and the effective ingredients of the mosquito coils are not lost.

[0050] Both the first sidewall 11 and the second sidewall 12 are equipped with conveyor chains 14, which are respectively designated as the first conveyor chain and the second conveyor chain. The movement trajectory of the conveyor chains 14 is a meandering S-shaped path (i.e., wavy) from top to bottom. Multiple drive sprockets 13, which mesh with the conveyor chains 14, are mounted on the inner sidewalls of both the first sidewall 11 and the second sidewall 12 via bearings. The conveyor chains 14 are mounted on the drive sprockets 13, which have a steering function to turn the conveyor chains 14 and a transmission function to mesh with the conveyor chains 14.

[0051] The first transmission sprocket group consists of a sprocket 13 located on the first sidewall 11 and a sprocket 13 located on the second sidewall 12. Each sprocket 13 in the first transmission sprocket group is positioned at a bend in the meandering S-shaped route, serving to bend the conveyor chain 14, or positioned between bends to increase the meshing force between the sprocket and the conveyor chain 14 to assist in conveying. The first conveyor chain is sequentially mounted on each sprocket 13 of the first transmission sprocket group according to its movement trajectory, and the first conveyor chain meshes with each sprocket 13 of the first transmission sprocket group. Each sprocket 13 of the second transmission sprocket group corresponds one-to-one with each sprocket 13 of the first transmission sprocket group. The second conveyor chain is sequentially mounted on each sprocket 13 of the second transmission sprocket group according to its movement trajectory. Thus, the first and second conveyor chains are installed parallel to each other, forming a chain bridge, which is used to connect the mosquito coil sieve disc 3. The mosquito coil sieve tray 3 is horizontally installed between the chain bridge (i.e., the first conveyor chain and the second conveyor chain).

[0052] by Figure 3 The orientation shown is for reference. In this embodiment, each drive sprocket 13 of the first drive sprocket group is respectively located at the bend of the S-shaped route. The drive sprockets 13 of the first drive sprocket group roughly form a left column and a right column. The drive sprockets 13 of the left column and the right column are staggered one by one in the height direction. Preferably, the vertical distance between each adjacent drive sprocket 13 in the left column is equal, and the vertical distance between each adjacent drive sprocket 13 in the right column is equal. The inlet end of the heat-insulating drying oven 1 is located on the left, and the outlet end of the heat-insulating drying oven 1 is located on the right. The highest drive sprocket 13 in the left column is the second sprocket 132, and the highest drive sprocket 13 in the right column is the first sprocket 131. The second sprocket 132 is located near the inlet end of the heat-insulating drying oven 1, and the first sprocket 131 is located away from the inlet end of the heat-insulating drying oven 1. The installation height of the first sprocket 131 is higher than the installation height of the second sprocket 132. The conveyor chain 14 mounted on each of the transmission sprockets 13 of the first transmission sprocket group conveys laterally from left to right, and after turning, conveys laterally from right to left, thus making a detour.

[0053] The wet mosquito coil 9 is fed into the inlet of the heat-insulating drying chamber 1 and discharged from the outlet after drying. A lifting frame 5 is located on one side of the heat-insulating drying chamber 1 at its inlet, with the upper output end of the lifting frame 5 connected to the inlet of the heat-insulating drying chamber 1. A transition platform 6 is located on one side of the heat-insulating drying chamber 1 at its outlet. The transition platform 6 is connected to the outlet of the heat-insulating drying chamber 1 and is positioned corresponding to the bottom wall of the heat-insulating drying chamber 1. A first transition sprocket 51 is located on the upper left side of the second sprocket 132, and the lifting frame 5 is located to the lower left of the first transition sprocket 51. A portion of the conveyor chain 14 is wound around the lifting frame 5.

[0054] To prevent the first and second conveyor chains from sagging due to gravity during operation and affecting the transmission efficiency of the mosquito coil sieve 3, chain support rails are provided between adjacent transmission sprockets 13 along the conveying direction of the conveyor chain 14 on the first side wall 11. The corresponding parts of the conveyor chain 14 are stably transmitted under the support and guidance of these chain support rails. Chain support rails are similarly provided on the second side wall 12. The lifting frame 5 is a chain lifting support. Chain support rails are also provided on the support arms of the transition platform 6. The chain support rails facilitate stable transmission of the mosquito coil sieve 3 by the conveyor chain 14.

[0055] The lifting frame 5 is an inclined frame, and the transition platform 6 is a horizontal platform. The lifting frame 5 has a first support arm and a second support arm arranged in parallel, forming a lifting channel between the first and second support arms. The transition platform 6 also has two opposing support arms, forming an output channel between the two support arms. A first conveyor chain and a second conveyor chain extend and are correspondingly mounted around the first and second support arms of the lifting frame 5. In addition, the first and second conveyor chains extend and are correspondingly mounted on the two support arms of the transition platform 6. The lifting channel of the lifting frame 5, the drying channel of the heat-insulated drying chamber 1, and the output channel of the transition platform 6 are sequentially connected in pairs. After being lifted and conveyed by the lifting frame 5, the mosquito coil sieve 3 enters the drying channel of the heat-insulated drying chamber 1 for drying, and is then output through the output channel of the transition platform 6.

[0056] With the bottom of the lifting frame 5 as the input end, the input end of the lifting frame 5 is equipped with a drive sprocket 15. A second transition sprocket 17 is installed on the support arm of the transition platform 6. The first and second conveying chains are both closed-loop chains, which are sequentially wound around the drive sprocket 15, the first transition sprocket 51, the transmission sprocket 13, and the second transition sprocket 17, and return to the position of the drive sprocket 15 by the second transition sprocket 17. That is, the second transition sprocket 17 is driven by the drive sprocket 15. The conveying chain 14 (including the first and second conveying chains) is driven by the drive sprocket 15, which is driven by the geared motor 10. The drive sprocket 15 is driven by the output shaft of the geared motor 10.

[0057] It should be noted that a forming device (not shown in the figure) is provided on the side of the heat-insulating drying oven 1, located at the input end of the lifting frame 5. The output end of this forming device is connected to the mosquito coil sieve tray 3 corresponding to the input end of the lifting frame 5. The wet mosquito coil 9 is a mosquito coil blank tray. A collecting device (not shown in the figure) is provided on the side of the heat-insulating drying oven 1, located at the output end of the transition platform 6. The output end of the transition platform 6 is connected to the input end of the collecting device. In this invention, the forming device and the collecting device adopt existing well-known technologies in the industry, and will not be described in detail here.

[0058] The mosquito coil sieve 3 is rectangular and horizontally installed along the width of the heat-insulating drying chamber 1. The mosquito coil sieve 3 has a first end and a second end. The first end is mounted on a first conveyor chain on a first sidewall 11 via a rotating shaft 31, and the second end is mounted on a second conveyor chain on a second sidewall 12 via another rotating shaft 31. The first and second ends of the mosquito coil sieve 3 are connected to the rotating shaft 31, or the rotating shaft 31 is connected to the first conveyor chain on the first sidewall 11 and the second conveyor chain on the second sidewall 12 via a pivotal connection. Preferably, the rotating shaft 31 is pivotally connected to the first and second ends of the mosquito coil sieve 3 at the midpoint along the width of the mosquito coil sieve 3. The rotating shaft 31 is located on the central axis of the mosquito coil sieve 3. Preferably, the first and second ends of the mosquito coil sieve 3 are each provided with a bearing, and the rotating shaft 31 is pivotally connected to the first and second ends of the mosquito coil sieve 3 via these bearings. In this way, the mosquito coil sieve tray 3 is pivotally connected to the conveyor chain 14, ensuring that the mosquito coil sieve tray 3 remains horizontal while being transported by the conveyor chain 14, and that its placement surface always faces upwards, preventing the wet mosquito coils 9 from falling off. The placement surface of the mosquito coil sieve tray 3 is covered with neatly arranged wet mosquito coils 9 along its length. During operation, multiple mosquito coil sieve trays 3 are arranged along the conveying direction of the conveyor chain 14.

[0059] A weight 4 is suspended from the bottom of both the first and second ends of the mosquito coil sieve 3 by a soft rope. The weight 4 helps maintain the balance of the mosquito coil sieve 3. Alternatively, the weight 4 can be suspended only below the middle of the mosquito coil sieve 3. The weight 4 is in the shape of a cone or frustum, etc. Each weight 4 is suspended below the mosquito coil sieve 3 by two soft ropes, which are respectively tied to both sides along the width direction of the mosquito coil sieve 3, that is, on both sides of the central axis of the mosquito coil sieve 3. This allows the weight 4 to self-adjust and maintain the balance of the mosquito coil sieve 3. When in a balanced state, the weight 4 is directly below the mosquito coil sieve 3. The mosquito coil sieve 3 is used to hold wet mosquito coils to be dried. Its sieve structure facilitates the flow of hot steam / vapor, which can accelerate the evaporation rate of water vapor. It should be noted that the number and position of the weights in this invention only need to meet the requirement of maintaining the balance of the mosquito coil sieve 3 during the conveying process, and no further limitations are imposed here.

[0060] This invention employs a PLC control system. The PLC control system includes a PLC controller and a human-machine interface touchscreen, which are bidirectionally connected. The output of the PLC controller is connected to a geared motor 10. Adjusting the speed of the geared motor 10 via the PLC controller adjusts the speed of the drive sprocket 15, thereby adjusting the conveying speed of the conveyor chain 14, i.e., the moving speed of the mosquito coil sieve 3, and thus controlling the drying time of the wet mosquito coil 9 in the heat-insulating drying chamber 1. Preferably, the drying time of the wet mosquito coil 9 (i.e., the mosquito coil sieve 3) in the heat-insulating drying chamber 1 (i.e., the time the mosquito coil sieve 3 moves along an S-shaped path) matches the time when the wet mosquito coil 9 is just dried. "Just dried" means that the moisture content of the mosquito coil meets industry-standard product requirements. Furthermore, the corresponding output of the PLC controller is also connected to various components of the closed-loop dehumidifying heat pump dryer 2 to control the temperature and humidity within the heat-insulating drying chamber 1.

[0061] The mosquito coil blank is stamped and formed by a forming device. After demolding, the wet mosquito coil 9 is transferred from the output end of the forming device to the mosquito coil sieve 3 placed on the input end of the lifting frame 5. The reduction motor 10 drives the drive sprocket 15 to rotate, which in turn drives the conveyor chain 14 meshing with the drive sprocket 15. Furthermore, the mosquito coil sieve 3 moves with the conveyor chain 14. First, it is lifted to the highest position by the lifting frame 5 and then enters the drying channel in the heat-insulating drying chamber 1 for drying. In the drying channel, it moves along the trajectory of the conveyor chain 14, that is, it moves from top to bottom along an S-shaped route. Finally, it is transferred from the outlet end of the heat-insulating drying chamber 1 to the transition table 6. Then, the mosquito coil collecting device collects the dried mosquito coils placed on the mosquito coil sieve 3 on the transition table 6. The closed-loop conveyor chain 14 continues to move to the input end of the lifting frame 5, further transferring the empty mosquito coil sieve 3 into the heat-insulating drying chamber 1 for drying. This cycle repeats continuously.

[0062] It should be noted that the travel trajectory of the mosquito coil sieve disc 3 during conveying can be adaptively adjusted according to actual needs by adjusting the positions of the transmission sprocket 13 and the conveying chain 14. The distribution density of the mosquito coil sieve disc 3 can be adjusted according to actual conditions.

[0063] This invention discloses a fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device. It employs a closed-loop dehumidification heat pump dryer 2 to dehumidify and heat the drying channel of an insulated drying chamber 1, drying the wet mosquito coils 9 within the chamber. Compared to traditional drying technologies, this method is more energy-efficient, environmentally friendly, and highly effective. The closed-loop dehumidification and heating system eliminates the limitations imposed by external conditions. Furthermore, compared to traditional tunnel drying systems, the use of a meandering conveyor chain 14 extends the travel distance of the wet mosquito coils 9 within the tunnel-type insulated drying chamber 1, thereby shortening the chamber's length, effectively saving space, and increasing the total contact area between hot air and the wet mosquito coils 9. This improves the thermal energy utilization rate of the closed-loop dehumidification heat pump dryer 2 and increases mosquito coil production capacity. Additionally, a counterweight is placed below the mosquito coil sieve 3 to maintain its balance during movement, achieving fully automated drying with high processing efficiency.

[0064] Example 2

[0065] The first transmission unit is the corresponding drive sprocket 13, conveyor chain 14, and chain support rail within the heat-insulating drying oven 1 of Embodiment 1. The difference between this embodiment and Embodiment 1 is that: Figure 6 As shown, the fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device includes two parallel transmission units, namely the first transmission unit and the second transmission unit. The second transmission unit has the same structure as the first transmission unit, and will not be described in detail here. Both the first transmission unit and the second transmission unit are equipped with a closed-loop dehumidification heat pump dryer 2.

[0066] The heat-insulating drying chamber 1 has an inlet end and an outlet end. A first transmission unit and a second transmission unit are sequentially arranged between the inlet end and the outlet end. The first transmission unit is connected to the inlet end, and the second transmission unit is connected to the outlet end. The first transmission unit and the second transmission unit are interconnected. A reinforcing sprocket 16 is provided between the first transmission unit and the second transmission unit. The height of the reinforcing sprocket 16 is the same as that of the drive sprocket 15. In this embodiment, the drive sprocket 15 and the reinforcing sprocket 16 are each driven by a reduction motor 10, and the drive sprocket 15 and the reinforcing sprocket 16 are respectively connected to the corresponding reduction motor 10 for transmission. Preferably, a lifting frame 5 is added between the reinforcing sprocket 16 and the highest transmission sprocket 13 of the second transmission unit. Since the conveying chains 14 of the first transmission unit and the second transmission unit are both assembled in a meandering and turning manner, the mosquito coil sieve plate fixed on the conveying chain 14 travels in a meandering S-shaped turn in the first transmission unit and the second transmission unit of the heat-insulating drying chamber 1.

[0067] In this embodiment, the heat-insulating drying oven 1 is equipped with a reinforced sprocket 16 and two geared motors 10 are used to drive the conveyor chain 14, which significantly increases the conveying power of the conveyor chain 14, increases the stability of the mosquito coil sieve during conveying, and can speed up the conveying speed of the mosquito coil sieve. The increased conveying speed of the mosquito coil sieve can speed up the air circulation speed in the drying channel, thereby increasing the drying speed.

[0068] It should be noted that the number of transmission units in the heat-insulating drying oven 1 can be set according to actual needs, and this invention does not limit it. Each transmission unit is equipped with a closed-loop dehumidifying heat pump dryer 2 that corresponds to it. The working principle of each closed-loop dehumidifying heat pump dryer 2 is the same, but the power specifications and other parameters may be different.

[0069] Example 3

[0070] The difference between this embodiment and Embodiment 1 is that in this embodiment, multiple compressors with identical structures arranged sequentially are provided between the evaporator and the condenser. In actual production, it is preferable to provide five 12P compressors to adjust the evaporation and condensation temperatures accordingly. It should be noted that the selection of compressor specifications and the setting of the number are related to the evaporation and condensation temperatures required for actual production, and are not limited here.

[0071] Example 4

[0072] The compressor, condenser, evaporator, and exhaust fan of the closed-loop dehumidifying heat pump dryer in Example 2 are used as the first heat pump unit, and its working principle is the same as that of the closed-loop dehumidifying heat pump dryer described above. The difference between this example and Example 2 is: Figure 7 As shown, the first transmission unit and the second transmission unit share a closed-loop dehumidifying heat pump dryer. The closed-loop dehumidifying heat pump dryer includes a first heat pump unit and a second heat pump unit. The components and working principles of the second heat pump unit and the first heat pump unit are identical, and the components of the first heat pump unit and the second heat pump unit are arranged in a mirror-symmetrical manner. The first heat pump unit corresponds to the first transmission unit, and the second heat pump unit corresponds to the second transmission unit.

[0073] It should be noted that in this embodiment, the first heat pump unit has three 12P compressors, while the second heat pump unit has five 12P compressors. This ensures that the temperature of the drying hot air in the first transmission unit is lower than that in the second transmission unit. Preferably, during the mosquito coil drying process, when the mosquito coil is transferred from the first transmission unit to the second transmission unit, it is transferred from a low-temperature zone to a high-temperature zone. This ensures that the surface of the wet mosquito coil is free of a water film during drying, resulting in high-quality dried mosquito coils.

[0074] The above embodiments and accompanying drawings are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device, comprising an insulated drying chamber and a closed-loop dehumidification heat pump dryer that provides dry hot air to the insulated drying chamber, wherein the closed-loop dehumidification heat pump dryer is located outside the insulated drying chamber, and the interior of the insulated drying chamber is a drying channel for accommodating mosquito coil sieves, characterized in that: The closed-loop dehumidifying heat pump dryer and the heat-insulated drying room are connected by air supply pipes and return air pipes respectively to form a heat circulation loop; On a set of opposite side walls of the heat-insulating drying oven, there are corresponding sets of parallel conveyor chains and drive sprockets meshing with the conveyor chains. The conveyor chains are mounted on the drive sprockets and are arranged to meander along an S-shaped route. Mosquito coil sieves are horizontally installed between the parallel conveyor chains in a movable pivoting manner. A weight is suspended below the mosquito coil sieve by a soft rope to help maintain the balance of the mosquito coil sieve during the conveying process. The mosquito coil sieve is rectangular and has a first end and a second end. The first end and the second end are respectively pivotally connected to the conveyor chain via a rotating shaft. The weight is suspended on the mosquito coil sieve by two soft ropes, and the two soft ropes are respectively tied to the mosquito coil sieve at two positions along the central axis of the mosquito coil sieve.

2. The fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device according to claim 1, characterized in that: The weight is positioned directly below the mosquito coil sieve, or below the first and second ends of the mosquito coil sieve, respectively.

3. The fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device according to claim 1, characterized in that: The number of the hammers is one or more.

4. The fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device according to claim 1, characterized in that: The heat-insulating drying oven is a tunnel-type heat-insulating drying oven, including a first side wall and a second side wall arranged opposite to each other, as well as a top wall and a bottom wall arranged opposite to each other. The first side wall, the top wall, the second side wall and the bottom wall are connected and enclosed in sequence to form the drying channel. The heat-insulating drying oven has an inlet end and an outlet end, and the inlet end and the outlet end are respectively located at both ends along the length direction of the heat-insulating drying oven. A lifting frame is provided on one side of the insulated drying chamber at its inlet end for lifting and conveying the mosquito coil sieve tray containing the mosquito coils to be dried. The lifting frame is connected to the inlet end of the insulated drying chamber. A transition platform is provided on one side of the insulated drying chamber at its outlet end for horizontally outputting the mosquito coil sieve tray containing the dried mosquito coils. The transition platform is set corresponding to the bottom wall of the insulated drying chamber and is connected to the outlet end of the insulated drying chamber. Parallel conveying chains are respectively set on the first side wall and the second side wall and extend and are installed on the lifting frame and the transition platform.

5. The fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device according to claim 4, characterized in that: The closed-loop dehumidifying heat pump dryer includes a compressor, an exhaust fan, a condenser for heating and drying air, and an evaporator for dehumidifying and absorbing the potential heat of the humid air. The closed-loop dehumidifying heat pump dryer is provided with a dry hot air outlet and a humid hot air return outlet. The interior of the closed-loop dehumidifying heat pump dryer has an air passage. The dry hot air outlet and the humid hot air return outlet are located at both ends of the air passage of the closed-loop dehumidifying heat pump dryer. The top wall of the heat-insulating drying chamber is provided with a dry hot air inlet and a humid hot air outlet at the positions where they connect with the dry hot air outlet and the humid hot air return outlet, respectively. The evaporator, the compressor, and the condenser are sequentially arranged in the air passage of the closed-loop dehumidification heat pump dryer. The exhaust fan is located at the dry hot air inlet and is connected to the dry hot air outlet through the air supply pipe. The condenser is located close to the exhaust fan, and the evaporator is located away from the exhaust fan.

6. The fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device according to claim 5, characterized in that: The evaporator is provided with a water collection tray for collecting condensate and a water guide pipe connected to the water collection tray for discharging the condensate. The water guide pipe extends from inside the closed-loop dehumidifying heat pump dryer to outside the closed-loop dehumidifying heat pump dryer.

7. The fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device according to claim 5, characterized in that: The heat-insulating drying oven has a plurality of transmission units including the drive sprocket and the conveying chain. The closed-loop dehumidifying heat pump dryer has a plurality of heat pump units including the evaporator, the compressor and the condenser. Each heat pump unit has a plurality of compressors, and the number and power of the compressors in each heat pump unit are the same or different. Each heat pump unit is configured in one-to-one correspondence with each of the transmission units in the heat-insulating drying oven.

8. The fully automatic tunnel-type closed-loop dehumidification mosquito coil drying device according to claim 1, characterized in that: The heat-insulating drying oven has a plurality of transmission units including the drive sprocket and the conveying chain, and the number of closed-loop dehumidifying heat pump dryers is a plurality of units, with each closed-loop dehumidifying heat pump dryer corresponding to each transmission unit of the heat-insulating drying oven.

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