Energy-saving corrugated carton drying unit

Abstract

The invention relates to an energy-saving corrugated carton drying unit, and belongs to the technical field of corrugated carton drying, the energy-saving corrugated carton drying unit comprises a conveying belt device and a drying box body fixedly connected to the top of the conveying belt device, and a cooling box body is arranged on the side, away from the drying box body, of the outer portion of the conveying belt device; and a microwave drying mechanism capable of drying the corrugated carton is arranged in the drying box body. According to the energy-saving corrugated carton drying unit, by arranging the magnetron device and the resonant cavity wall, corrugated cartons on the conveying belt device can be subjected to microwave drying treatment, then by arranging the heat pump and the damp and hot pipeline, damp and hot air generated in the drying process can be conveyed into the heat pump, then the damp and hot air is converted into heat energy through the heat pump, and the heat energy is supplied to the corrugated cartons; and by arranging the air injection steel pipe, heat energy can be conveyed into the drying box body again, so that the corrugated carton can be dried, meanwhile, the heat energy can be recycled, and a good energy-saving effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of corrugated carton drying, in particular to an energy-saving corrugated carton drying unit. BACKGROUND

[0002] The corrugated carton is a kind of packaging container made of corrugated paperboard as the core material, which is composed of face paper, corrugated core paper and inner paper, and the wave-shaped corrugated layer in the middle endows it with excellent compression resistance and cushioning performance. Since this packaging form was invented in the mid-19th century, it has become one of the most widely used transportation packaging materials in the world due to its advantages of lightness, strength, recyclability, etc.

[0003] The Chinese invention patent with publication number CN118274596A discloses a drying device for corrugated carton production, which comprises two drying bins arranged on a fixed base frame, and the two drying bins are separated by a partition. The top of each drying bin is provided with an arc-shaped hollow bin cover connected with the drying bin, and a communication hole is formed in the contact position of the partition and the arc-shaped hollow bin cover to keep the arc-shaped hollow bin covers interconnected when installed. A fan is arranged on the fixed base frame to dry and blow the paper boxes in one of the drying bins. When one of the drying bins is drying the paper boxes, the other drying bin is preheating the paper boxes. The advantage of this invention is that the heat generated in the drying operation of one drying bin can be transferred to the other drying bin to preheat the paper boxes in the other drying bin, which can recycle the heat and further improve the drying efficiency of the paper boxes.

[0004] However, in the process of using the invention, only one drying device is arranged in each of the two drying bins, which makes the temperature inside the two drying bins inconsistent. When the drying of the corrugated carton in one drying bin is completed, the other drying bin cannot complete the drying, which greatly increases the difficulty of the work of the workers and cannot meet the production demand. Therefore, an energy-saving corrugated carton drying unit is proposed to solve the above problems. SUMMARY

[0005] In view of the shortcomings of the prior art, the present application provides an energy-saving corrugated carton drying unit, which has the advantage of being able to greatly improve the drying efficiency and solve the problem that only one drying device is arranged in each of the two drying bins in the existing drying unit, which makes the temperature inside the two drying bins inconsistent. When the drying of the corrugated carton in one drying bin is completed, the other drying bin cannot complete the drying, which greatly increases the difficulty of the work of the workers and cannot meet the production demand.

[0006] In order to achieve the above object, the present application provides the following technical scheme: an energy-saving corrugated carton drying unit, comprising a conveying belt device and a drying box body fixedly connected to the top of the conveying belt device, a cooling box body is arranged on the side of the conveying belt device away from the drying box body, and a microwave drying mechanism capable of drying corrugated cartons is arranged in the drying box body.

[0007] The microwave drying mechanism comprises a first partition plate fixedly connected to the inside of the drying box body, a magnetron device extending to the bottom of the first partition plate is fixedly connected to the top of the first partition plate, a wet heat pipeline is fixedly connected to the top of the drying box body and communicates with the inside of the drying box body, and a heat pump is fixedly connected to the top end of the wet heat pipeline.

[0008] Further, the drying box body is provided with a through opening on the left and right sides, which can be used for the entry and exit of corrugated cartons, and a resonant cavity wall is fixedly connected to the side of the drying box body close to the conveying belt device.

[0009] Further, the number of the magnetron devices is two, and the two magnetron devices are symmetrically distributed in the inside of the drying box body.

[0010] Further, a jet steel pipe is fixedly connected to the back of the inside of the drying box body, and a communication pipeline is fixedly connected between the jet steel pipe and the heat pump.

[0011] Further, a spray seat is fixedly connected to the inside of the cooling box body, a jet head is fixedly connected to the side of the spray seat close to the conveying belt device, a cooling fan is fixedly connected to the front of the cooling box body, and a conveying pipeline is fixedly connected between the output end of the cooling fan and the spray seat.

[0012] Further, the number of the spray seats is two, and the two spray seats are respectively distributed on the top and bottom of the conveying belt device, and the left and right sides of the cooling box body are provided with a communication opening capable of being used for the entry and exit of corrugated cartons.

[0013] Further, a second partition plate is fixedly connected to the inside of the cooling box body, an infrared lamp tube is fixedly connected to the inside of the cooling box body, and an exhaust hole is formed in the inside of the second partition plate.

[0014] Further, a support frame is fixedly connected to the top of the inside of the cooling box body, an exhaust fan is fixedly connected to the inside of the support frame, and a protective plate communicating with the outside is fixedly connected to the inner top wall of the cooling box body.

[0015] Further, the number of the exhaust fans is four, and the four exhaust fans are uniformly distributed in the inside of the support frame, and the air direction of the exhaust fans is toward the side of the protective plate.

[0016] Further, the inner wall of the drying box and the cooling box is fixedly connected with a temperature sensor, and the inner wall of the drying box near the conveying belt device is fixedly connected with an infrared moisture meter.

[0017] Compared with the prior art, the energy-saving corrugated carton drying unit has the following beneficial effects:

[0018] 1. The energy-saving corrugated carton drying unit can dry the corrugated carton on the conveying belt device through the setting of the magnetron device and the resonant cavity wall, can transport the humid hot air generated during drying into the heat pump through the setting of the heat pump and the wet heat pipeline, can convert the humid hot air into heat energy through the heat pump, and can transport the heat energy into the drying box again through the setting of the air injection steel pipe, so that the corrugated carton can be dried, and the heat energy can be recycled, achieving good energy-saving effect.

[0019] 2. The energy-saving corrugated carton drying unit can cool and shape the corrugated carton through the setting of the cooling fan and the conveying pipeline, the setting of the spraying seat and the air injection head, and the spraying of cold air through the air injection head, so that the whole process has high automation degree, the processing efficiency is improved, and the problem that only one drying device is arranged in the two drying bins in the prior art drying unit, the temperature in the two drying bins is inconsistent, when the corrugated carton in one drying bin is dried, the other drying bin cannot be dried, the working difficulty of the workers is greatly increased, and the production demand cannot be met. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure perspective view of the energy-saving corrugated carton drying unit.

[0021] Figure 2 It is a structure sectional view of the energy-saving corrugated carton drying unit.

[0022] Figure 3 It is a structure sectional view of the drying box of the energy-saving corrugated carton drying unit.

[0023] Figure 4 It is a structure sectional view of the cooling box of the energy-saving corrugated carton drying unit.

[0024] In the figure: 1, conveying belt device; 2, drying box; 3, cooling box; 4, first partition; 5, magnetron device; 6, wet heat pipeline; 7, heat pump; 8, air injection steel pipe; 9, resonant cavity wall; 10, second partition; 11, spraying seat; 12, air injection head; 13, cooling fan; 14, conveying pipeline; 15, infrared lamp; 16, support frame; 17, exhaust fan; 18, protective plate. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0026] Please refer to Figures 1 to 3 The energy-saving corrugated carton drying unit in the embodiment comprises a conveying belt device 1 and a drying box body 2 fixedly connected to the top of the conveying belt device 1, a cooling box body 3 is arranged on the side of the conveying belt device 1 away from the drying box body 2, a microwave drying mechanism capable of drying corrugated cartons is arranged in the inside of the drying box body 2, the microwave drying mechanism comprises a first partition plate 4 fixedly connected to the inside of the drying box body 2, a magnetron device 5 extending to the bottom of the first partition plate 4 is fixedly connected to the top of the first partition plate 4, a wet heat pipeline 6 communicating with the inside of the drying box body 2 is fixedly connected to the top of the drying box body 2, and a heat pump 7 is fixedly connected to the top end of the wet heat pipeline 6.

[0027] Specifically, the left and right sides of the drying box body 2 are both provided with a through port for the corrugated cartons to enter and exit, a flexible sealing curtain (silicone rubber material with a thickness of 3 mm) is mounted on the edge of the through port, microwave leakage (actual measured leakage amount ≤2 mW / cm²) can be reduced, and the paperboard conveying is not affected, a resonant cavity wall 9 is fixedly connected to the side of the inside of the drying box body 2 close to the conveying belt device 1, the cavity wall is made of 304 stainless steel material (thickness of 2 mm) and is subjected to mirror polishing treatment (reflectivity >95%), can form a standing wave field to enhance the microwave energy utilization rate, the number of the magnetron devices 5 is two, and the power of a single magnetron device 5 is 1.5 kW (frequency of 2450 MHz), and the two magnetron devices 5 are symmetrically distributed in the inside of the drying box body 2.

[0028] It should be noted that a jet steel pipe 8 is fixedly connected to the back of the inside of the drying box body 2, the steel pipe has a diameter of 50 mm, a jet micro-hole (hole distance of 5 cm) with a diameter of 2 mm is arranged on the surface of the steel pipe, a communication pipeline (PU heat preservation pipe with a heat conduction coefficient ≤0.03 W / m・K) is fixedly connected between the jet steel pipe 8 and the heat pump 7, the heat pump 7 can send the heat recovered in the form of 50-60 ℃ hot air into the inside of the drying box 2 to supplement the heat energy of the microwave drying, and temperature sensors are fixedly connected to the inner walls of the drying box body 2 and the cooling box body 3, an infrared moisture meter is fixedly connected to the side of the inner wall of the drying box body 2 close to the conveying belt device 1, and the data of the temperature sensors and the infrared moisture meter are both transmitted to a PLC control system in real time.

[0029] Please refer to Figure 1 and Figure 4In the embodiment, the inside of the cooling box body 3 is fixedly connected with spray seats 11, the spray seats 11 are fixedly connected with air jet heads 12 close to one side of the conveying belt device 1, the front of the cooling box body 3 is fixedly connected with cooling fans 13, the output end of the cooling fan 13 is fixedly connected with a conveying pipeline 14 between the spray seat 11, the number of the spray seat 11 is two, the two spray seats 11 are respectively distributed on the top and bottom of the conveying belt device 1, and the left and right sides of the cooling box body 3 are both provided with communication openings capable of allowing the corrugated paper box to enter and exit.

[0030] Specifically, each spray seat 11 is equipped with twelve air jet heads 12 (diameter 8mm, air outlet angle 45°), which are distributed in a matrix form (spacing 15cm*15cm), and a brush sealing device is installed at the communication opening to reduce the leakage of cold air.

[0031] It should be noted that the middle section of the conveying pipeline 14 is provided with a temperature adjusting valve, which can control the cooling air temperature in the range of 15-25℃, and the symmetrical layout of the spray seat 11 can realize the synchronous cooling of the upper and lower surfaces of the paperboard, and the cooling rate can reach 8-10℃ / s. The air jet head 12 adopts a Venturi structure design, which can increase the air outlet speed by 30% under the same air volume, and enhance the heat exchange efficiency of the airflow on the surface of the paperboard. The air inlet of the cooling fan 13 is provided with a primary filter (filtering precision 5μm).

[0032] Please refer to Figure 1 、 Figure 2 and Figure 4 In the embodiment, the inside of the cooling box body 3 is fixedly connected with a second partition plate 10, the inside of the cooling box body 3 is fixedly connected with an infrared lamp tube 15 (power 500W, wavelength 2-5μm), the inside of the second partition plate 10 is provided with exhaust holes, the top of the inside of the cooling box body 3 is fixedly connected with a support frame 16, the inside of the support frame 16 is fixedly connected with exhaust fans 17 (rotating speed 1500r / min, air pressure 150Pa), and the inner top wall of the cooling box body 3 is fixedly connected with a protective plate 18 connected with the outside.

[0033] Specifically, the number of the exhaust fan 17 is four, the four exhaust fans 17 are evenly distributed in the inside of the support frame 16, the air direction of the exhaust fan 17 is towards one side of the protective plate 18, forming a directional airflow to exhaust the hot and humid air in the cooling box, and the air exchange frequency is 30 times / h.

[0034] It should be noted that the infrared lamp tube 15 is installed between the second partition plate 10 and the conveying belt device 1, and can slightly heat the cooled paperboard (temperature increase 3-5℃), so as to avoid moisture condensation caused by excessive cooling. The exhaust holes of the second partition plate 10 are arranged in a staggered manner, so that the upward airflow uniformly passes through the gap between the paperboards, and the exhaust fan 17 forms an airflow circulation from bottom to top, thereby improving the humidity control efficiency. The on-off state of the infrared lamp tube 15 is controlled by the humidity sensor (accuracy ±2%RH) at the outlet of the cooling box 3. When the detected humidity is greater than 60%, the infrared lamp tube 15 is automatically turned on.

[0035] The working principle of the above embodiment is as follows:

[0036] The corrugated carton is conveyed by the conveying belt device 1, and first enters the inside through the through hole of the drying box 2. According to the initial moisture content detected by the infrared moisture meter, the PLC control system starts the two symmetrically distributed magnetron devices 5, and in the microwave field formed by the resonant cavity wall 9, the paperboard is penetrated and heated, so that the internal water molecules vibrate at high frequency to generate heat and evaporate. The humid hot air (temperature 60-70℃) enters the heat pump 7 through the humid hot pipeline 6, and the heat is recovered (COP value 3.8). The heat is delivered to the jet steel pipe 8 through the connecting pipeline, and is returned to the drying box 2 in the form of hot air, so as to realize the recycling of heat energy (energy saving rate > 30%). The dried paperboard (moisture content meets the standard) enters the cooling box 3. At this time, the cooling fan 13 delivers cold air to the jet head 12 of the upward and downward spraying seat 11 through the conveying pipeline 14, and the temperature of the paperboard is reduced from 60-70℃ to below 30℃ within 1-2 seconds. The water vapor generated in the cooling process is discharged outside the box through the exhaust holes of the second partition plate 10 by the exhaust fan 17 through the protective plate 18. If the outlet humidity sensor detects that the surface humidity of the paperboard is too high, the infrared lamp tube 15 is automatically started to remove the residual moisture through radiation heat exchange, and finally the energy-saving drying and shaping treatment of the corrugated carton is completed. During the whole process, the temperature sensor monitors the temperature in the box in real time. When the temperature of the drying box 2 is greater than 80℃ or the temperature of the cooling box 3 is less than 10℃, the system automatically adjusts the power of the magnetron or the air volume of the cooling fan 13, so as to ensure the stable operation of the equipment.

[0037] The installation mode, connection mode or setting mode disclosed in the embodiment are all common mechanical connection modes, as long as the beneficial effects can be achieved. In addition, the electrical elements appearing in the embodiment are electrically connected with the master controller and the power supply. The master controller can be a conventional known device such as a computer which plays a control role. A person skilled in the art can control the electrical elements through simple programming, and the existing disclosed power connection technology also belongs to the common knowledge in the art. Therefore, the specific structure, composition and working principle of the embodiment will not be described in detail.

[0038] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and implementations, it is to be understood that the terminology used is for the purpose of descriptive clarity and that it should be taken in a descriptive sense and not a limiting sense.

[0039] While the embodiments of the application have been shown and described herein, it is to be understood that the application is not limited to these embodiments. Rather, many modifications, changes, substitutions, and alterations can be made to the embodiments of the application without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. An energy-saving corrugated carton drying unit, comprising a conveying belt device (1) and a drying box body (2) fixedly connected to the top of the conveying belt device (1), characterized in that: The conveying belt device (1) is externally away from one side of the drying box body (2), and is provided with a cooling box body (3). The inside of the drying box body (2) is provided with a microwave drying mechanism capable of drying corrugated boxes. The microwave drying mechanism comprises a first partition plate (4) fixedly connected to the inside of the drying box body (2). The top of the first partition plate (4) is fixedly connected with a magnetron device (5) extending to the bottom thereof. The top of the drying box body (2) is fixedly connected with a wet heat pipeline (6) in communication with the inside thereof. The top end of the wet heat pipeline (6) is fixedly connected with a heat pump (7).

2. The energy-saving corrugated carton drying unit according to claim 1, characterized in that: The left and right sides of the drying box body (2) are both provided with a through port for the entry and exit of corrugated boxes. The side of the inside of the drying box body (2) close to the conveying belt device (1) is fixedly connected with a resonant cavity wall (9).

3. The energy-saving corrugated carton drying unit according to claim 1, characterized in that: The number of the magnetron devices (5) is two, and the two magnetron devices (5) are symmetrically distributed in the inside of the drying box body (2).

4. The energy-saving corrugated carton drying unit according to claim 1, characterized in that: The back of the inside of the drying box body (2) is fixedly connected with an air injection steel pipe (8). The air injection steel pipe (8) and the heat pump (7) are fixedly connected with a communication pipeline.

5. The energy-saving corrugated carton drying unit according to claim 1, characterized in that: The inside of the cooling box body (3) is fixedly connected with a spray seat (11). The side of the spray seat (11) close to the conveying belt device (1) is fixedly connected with an air injection head (12). The front of the cooling box body (3) is fixedly connected with a cooling fan (13). The output end of the cooling fan (13) and the spray seat (11) are fixedly connected with a conveying pipeline (14).

6. The energy-saving corrugated carton drying unit according to claim 5, characterized in that: The number of the spray seats (11) is two, and the two spray seats (11) are respectively distributed on the top and the bottom of the conveying belt device (1). The left and right sides of the cooling box body (3) are both provided with a communication port for the entry and exit of corrugated boxes.

7. The energy-saving corrugated carton drying unit according to claim 1, characterized in that: The inside of the cooling box body (3) is fixedly connected with a second partition plate (10). The inside of the cooling box body (3) is fixedly connected with an infrared lamp tube (15). The inside of the second partition plate (10) is provided with an air exhaust through hole.

8. The energy-saving corrugated carton drying unit according to claim 1, characterized in that: The top of the inside of the cooling box body (3) is fixedly connected with a support frame (16). The inside of the support frame (16) is fixedly connected with an air exhaust fan (17). The inner top wall of the cooling box body (3) is fixedly connected with a protective plate (18) in communication with the outside.

9. The energy-saving corrugated carton drying unit according to claim 8, characterized in that: The number of the air exhaust fans (17) is four, and the four air exhaust fans (17) are evenly distributed in the inside of the support frame (16). The air direction of the air exhaust fan (17) is towards the side of the protective plate (18).

10. The energy-saving corrugated carton drying unit according to claim 1, characterized in that: The inner walls of the drying box body (2) and the cooling box body (3) are both fixedly connected with temperature sensors. The side of the inner wall of the drying box body (2) close to the conveying belt device (1) is fixedly connected with an infrared moisture meter.

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