Drying device for expanded paper

Abstract

The utility model discloses a drying device for expanded paper, which comprises a microwave dryer and a belt conveyor, the feed end of the microwave dryer is rotatably provided with two mutually driven air supply ducts, the peripheral side surfaces of the air supply ducts are fixedly connected with a plurality of spring pins, one end of each spring pin is fixedly connected with an extrusion plate, and the other end of each spring pin is fixedly connected with a plurality of air supply ducts. A shaft rod at one end of the air supply barrel is a hollow shaft which is rotationally connected with a hot air pipe, and the other end of the hot air pipe is fixedly connected with an air heater. The problems that expanded paper depends on a fluffy porous structure, microwave rapid dehydration causes overlarge difference of evaporation speeds of internal and external moisture, uneven fiber shrinkage and pore collapse, and microwave high-frequency heating enables the surface of the expanded paper to be rapidly dried and shrunk, the internal moisture is still too much, inconsistent internal and external deformation is caused, and the quality of the expanded paper is influenced are solved. Therefore, the production quality of the expanded paper is influenced.

Description

Technical Field

[0001] This utility model belongs to the field of expanded paper processing technology, and in particular relates to a drying device for expanded paper. Background Technology

[0002] Expanded paper is made from pulp, old newsprint, old writing paper, and yellow core card waste paper as raw materials, and is supplemented with deinking agent, bleaching agent, cationic starch, expanding agent, SPN-1 rosin gum, liquid aluminum sulfate and other auxiliary materials, and is prepared through pulp preparation, papermaking and drying processes.

[0003] During the processing of expanded paper, a drying device is needed to dry it. Existing drying devices are generally microwave dryers. Compared with traditional drying equipment, microwave drying equipment is characterized by: fast drying speed, high efficiency, environmental friendliness, and energy saving, making it a new type of equipment that responds to the low-carbon economy. Its working principle is to use the penetrating heating of microwaves to raise the temperature of the material, causing the moisture in the material to vaporize and evaporate. The evaporated water vapor is then removed by a dehumidification system, achieving the purpose of drying the material. Below is detailed information about microwaves. Microwave dryers are generally equipped with a belt conveyor at the bottom. The expanded paper to be dried is placed on the belt conveyor, which transports the expanded paper. When the expanded paper enters the microwave generator, the microwaves penetrate the expanded paper, thus drying it.

[0004] Before microwave drying, the expanded paper needs to be pre-dehydrated. Existing expanded paper drying devices typically use a mounting frame with two dehydration rollers rotatably connected to the frame via bolts and bearing seats. A drive mechanism is fixedly connected to one surface of the mounting frame via bolts, and the output end of the drive mechanism is fixedly connected to the dehydration rollers. The drive mechanism drives the dehydration rollers to rotate in opposite directions, squeezing the expanded paper for pre-dehydration. However, the thickness of the expanded paper varies. When adjusting the distance between the two dehydration rollers according to the thickness of the expanded paper, the above-mentioned pre-dehydration device requires disassembling the bolts and moving the dehydration rollers up or down. After adjusting the distance, the bolts need to be tightened again. This method of adjusting the distance is cumbersome and reduces the drying efficiency of the equipment. To solve the above problems, a drying device for expanded paper is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a drying device for expanded paper, thereby solving the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model is a drying device for puffed paper, including a microwave dryer and a belt conveyor. The feed end of the microwave dryer is rotatably equipped with two mutually driven air delivery tubes. One end of the air delivery tube has a hollow shaft, and a hot air pipe is rotatably connected to the hollow shaft. The other end of the hot air pipe is fixedly connected to a hot air blower. The hot air blower delivers hot air through the hot air pipe into the air delivery tube, and then blows the hot air onto the puffed paper to accelerate the dehydration of the puffed paper.

[0008] The air supply duct has several extrusion plates arranged in a ring on its circumferential side. Several spring pins are fixedly connected between the air supply duct and the extrusion plates. The expanded paper passes between two air supply ducts. The air supply duct drives the extrusion plates to rotate, extruding and dehydrating the expanded paper. The spring pins enable the extrusion plates to move, extruding and dehydrating expanded paper of different thicknesses.

[0009] Preferably, the interior of the air supply duct and the periphery of the extrusion plate are provided with a plurality of first air outlets, which allow the hot air inside the air supply duct to be sprayed onto the expanded paper.

[0010] Preferably, a main gear and a secondary gear are fixedly sleeved on the shafts at one end of the two air ducts, respectively. The main gear and the secondary gear mesh. A mounting frame is fixedly connected to the feed end of the microwave dryer. A bracket is fixedly connected to one surface of the mounting frame. A motor is fixedly installed inside the bracket. The output end of the motor is fixedly connected to the shaft of the corresponding air duct. The meshing of the main gear and the secondary gear causes the two air ducts to rotate in opposite directions, which can convey the puffed paper.

[0011] Preferably, both air supply ducts are provided with annular cavities, and a first baffle and a second baffle are rotatably arranged in the annular cavities. Multiple connecting rods are fixedly connected between the first baffle and the second baffle.

[0012] The weight of the second baffle in the upper air duct is less than that of the first baffle, and the weight of the second baffle in the lower air duct is greater than that of the first baffle, so that the air blown out by the upper air duct is always at the bottom, and the air blown out by the lower air duct is always at the top.

[0013] Preferably, the first baffle inside the air supply duct is provided with a plurality of second air outlets.

[0014] Preferably, both the first baffle and the second baffle are arc-shaped plates with multiple sliding balls embedded on their surfaces, so that the first baffle and the second baffle can rotate smoothly in the air supply duct.

[0015] This utility model has the following beneficial effects:

[0016] This invention features a function to quickly adjust the size of the dewatering roller, eliminating the need for manual adjustment. By setting up a spring pin, a squeeze plate, and an air supply duct, the expanded paper passes between two air supply ducts and is squeezed by the squeeze plate to achieve pre-dewatering. Furthermore, the spring pin allows the squeeze plate to contract and extend, making it suitable for pre-dewatering expanded paper of different thicknesses. During the squeezing process, a hot air blower delivers hot air into the air supply duct through a hot air pipe to further heat and dry the expanded paper, improving the drying efficiency of the equipment.

[0017] This invention reduces the loss of hot air inside the air supply duct. It can pressurize the inside of the air supply duct and increase the flow rate of the hot air. By setting a first baffle and a second baffle, the hot air ejected from the upper air supply duct is always ejected downwards, and the hot air ejected from the lower air supply duct is always ejected upwards, which can effectively prevent heat loss and achieve energy saving.

[0018] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the rear three-dimensional structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the extrusion mechanism of this utility model;

[0023] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure;

[0024] Figure 5 This is a schematic diagram of the internal structure of the upper extrusion roller;

[0025] Figure 6 This is a schematic diagram of the windbreak mechanism installed inside the upper air supply duct;

[0026] Figure 7 This is a schematic diagram of the windbreak mechanism installed inside the lower air supply duct.

[0027] The components represented by each number in the attached diagram are listed below: 1. Microwave dryer; 2. Belt conveyor; 3. Mounting bracket; 4. Hot air blower; 5. Motor; 6. Main gear; 7. Secondary gear; 8. Hot air duct; 9. Air supply tube; 10. Extrusion plate; 11. First air outlet; 12. Spring pin; 13. First baffle; 14. Second baffle; 15. Connecting rod; 16. Second air outlet. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Example 1:

[0031] Please see Figures 1-7 As shown, this utility model is a drying device for puffed paper, including a microwave dryer 1 and a belt conveyor 2. The microwave dryer 1 is fixedly installed above the belt conveyor 2. The puffed paper is placed on the belt conveyor 2 and passes through the microwave dryer 1. Microwaves (frequency is usually 915 MHz or 2450 MHz) penetrate the puffed paper and are absorbed by water molecules and converted into heat energy. This causes the water molecules to vibrate at high frequency and generate heat, which causes the water to evaporate and achieves the function of drying the puffed paper.

[0032] The microwave dryer 1 has two mutually driving air ducts 9 rotatably mounted at its feed end. The microwave dryer 2 has a mounting frame 3 fixedly connected to its feed end, which is bolted to the microwave dryer 1. Both air ducts 9 are housed within the mounting frame 3. A hollow shaft is fixedly connected to one end of each air duct 9, and a hot air pipe 8 is connected inside the hollow shaft. The hot air pipe 8 is rotatably connected to the hollow shaft, and a hot air fan 4 is fixedly connected to one end of the hot air pipe 8 via a flange. While the extrusion plate 10 is pressing and dehydrating the expanded paper, the hot air fan 4 delivers hot air through the hot air pipe 8. The puffed paper is dried by blowing air into the air supply duct 9. The hollow shaft is rotatably connected to the mounting frame 3 through the bearing seat. Several spring pins 12 are fixedly connected to the circumferential side of the air supply duct 9. The spring pins 12 are fixedly connected to the air supply duct 9 by bolts. One end of the spring pin 12 is fixedly connected to the extrusion plate 10. The spring pins 12 are fixedly connected to the extrusion plate 10 by bolts. The setting of the spring pins 12 allows the extrusion plate 10 to extend and retract. The extrusion plate 10 can simultaneously extrude the upper and lower parts of the puffed paper. It is suitable for extrusion pre-dehydration of puffed paper of different thicknesses.

[0033] One surface of the mounting frame 3 is provided with a main gear 6, a secondary gear 7 and a bracket. The bracket is fixedly connected to the mounting frame 3 by welding. The main gear 6 and the secondary gear 7 are fixedly connected to two air ducts 9 respectively through connecting shafts. The connecting shafts are rotatably connected to the mounting frame 3 through bearing sleeves on the outside. A motor 5 is fixedly installed inside the bracket. The motor 5 is fixedly connected to the bracket by bolts. The output end of the motor 5 is fixedly connected to the main gear 6. The main gear 6 and the secondary gear 7 mesh. The arrangement of the two gears makes the two air ducts 9 rotate in opposite directions, so that the extrusion plate 10 can extrude and dehydrate the puffed paper at the same time, and then transport the puffed paper onto the belt conveyor 2 for further conveying and drying.

[0034] The air supply duct 9 and the extrusion plate 10 are provided with a number of first air outlet holes 11. The first air outlet holes 11 on the air supply duct 9 and the extrusion plate 10 are provided with corresponding positions. Further optimization is that the shape of the first air outlet hole 11 can be set as a Venturi tube, which can effectively increase the flow rate of hot air. During the extrusion and pre-dehydration process of the expanded paper, the hot air blower 4 delivers hot air to the air supply duct 9 through the hot air pipe 8. The hot air is further ejected through the first air outlet hole 11 to perform air jet drying on the dehydrated expanded paper, which effectively improves the drying efficiency of the equipment.

[0035] Before drying the expanded paper, start motor 5 and hot air blower 4. Place the expanded paper to be dried between two air ducts 9. Under the elastic force of spring pin 12, the extrusion plates 10 extend outward, so that the upper and lower extrusion plates 10 contact the upper and lower surfaces of the expanded paper. Motor 5 drives the main gear 6 to rotate. The main gear 6 meshes with the secondary gear 7, causing the two air ducts 9 to rotate in opposite directions. This, in turn, causes the upper and lower extrusion plates 10 to rotate in opposite directions. The extrusion plates 10 squeeze and pre-dehydrate the expanded paper. Pre-squeezing reduces the free water inside the expanded paper, relieves expansion stress, and protects the paper's fluffiness. Pre-squeezing reduces initial moisture, which can significantly reduce the microwave equipment's operating temperature. The energy consumption is reduced and the drying time is shortened. At the same time, the hot air blower 4 delivers hot air to the air supply duct 9 through the hot air pipe 8, and then the air is discharged through the first air outlet 11. The hot air blows onto the puffed paper to further dry the puffed paper and further improve the drying efficiency of the equipment. The pre-dehydrated puffed paper is conveyed to the belt conveyor 2 through the extrusion plate 10. The belt conveyor 2 conveys the puffed paper. When the puffed paper passes the microwave generator of the microwave dryer 1, the microwave penetrates the puffed paper and is absorbed by the water molecules and converted into heat energy. This causes the water molecules to vibrate at high frequency to generate heat, which causes the water to evaporate and realizes the function of drying the puffed paper. The dried puffed paper is conveyed to the other end on the belt conveyor 2 and collected manually by the staff.

[0036] Example 2:

[0037] Based on the structure of Embodiment 1, the air supply duct 9 has an annular cavity inside, and a second baffle 14 is provided inside the annular cavity. The second baffle 14 is semi-annular, and several connecting rods 15 are fixedly connected to both sides of the second baffle 14. One end of the connecting rod 15 is fixedly connected to a first baffle 13. The first baffle 13 and the second baffle 14 are both fixedly connected to the connecting rods 15 by welding. The second baffle 14 and the first baffle 13 are rotatably connected to the air supply duct 9. The first baffle 13 and the second baffle 14 are both arc-shaped plates with multiple sliding balls embedded on their surfaces, so that the first baffle 13 and the second baffle 14 can rotate smoothly in the air supply duct 9. The weight of the second baffle 14 in the upper air supply duct 9 is less than that of the first baffle 13. The weight of the baffle 14 is greater than that of the first baffle 13, so that during the rotation of the upper air supply duct 9, the first baffle 13 of the upper air supply duct 9 is always located at the bottom of the air supply duct 9, and the second baffle 14 inside the upper air supply duct 9 always blocks the upper part of the air supply duct 9, so that the hot air ejected from the upper air supply duct 9 is always downward. Similarly, the second baffle 14 of the lower air supply duct 9 is always located at the bottom, so that the hot air ejected from the lower air supply duct 9 is always upward. The periphery of the first baffle 13 is provided with several second air outlets 16. The positions of the second air outlets 16 are adapted to the positions of the first air outlets 11. Air is discharged through the second air outlets 16 on the first baffle 13, which can effectively reduce heat loss, improve the utilization rate of hot air, and save manpower.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A drying apparatus for expanded paper, comprising a microwave dryer (1) and a belt conveyor (2), characterized in that, The microwave dryer (1) has two mutually driven air ducts (9) rotatably installed at the feed end. One end of the air duct (9) has a hollow shaft, and a hot air pipe (8) is rotatably connected to the hollow shaft. The other end of the hot air pipe (8) is fixedly connected to a hot air blower (4). The hot air blower (4) delivers hot air through the hot air pipe (8) into the air duct (9), and then blows the hot air toward the expanded paper to accelerate the dehydration of the expanded paper. The air supply duct (9) has several extrusion plates (10) arranged in a ring on its circumferential side. Several spring pins (12) are fixedly connected between the air supply duct (9) and the extrusion plates (10). The expanded paper passes between the two air supply ducts (9). The air supply duct (9) drives the extrusion plates (10) to rotate, extruding and dehydrating the expanded paper. The spring pins (12) enable the extrusion plates (10) to move, extruding and dehydrating expanded paper of different thicknesses.

2. The drying apparatus for expanded paper according to claim 1, characterized in that, The air supply duct (9) and the circumferential side of the extrusion plate (10) are provided with a number of first air outlet holes (11), which allow the hot air inside the air supply duct (9) to be sprayed onto the expanded paper.

3. A drying apparatus for expanded paper according to claim 1, characterized in that, A main gear (6) and a secondary gear (7) are fixedly mounted on the shafts at one end of the two air ducts (9). The main gear (6) meshes with the secondary gear (7). A mounting frame (3) is fixedly connected to the feed end of the microwave dryer (1). A bracket is fixedly connected to one surface of the mounting frame (3). A motor (5) is fixedly installed inside the bracket. The output end of the motor (5) is fixedly connected to the shaft of the corresponding air duct (9). The meshing of the main gear (6) and the secondary gear (7) makes the two air ducts (9) rotate in opposite directions, which can transport the puffed paper.

4. A drying apparatus for expanded paper according to claim 1, characterized in that, Both air supply ducts (9) have annular cavities inside. A first baffle (13) and a second baffle (14) are rotatably arranged inside the annular cavities. Multiple connecting rods (15) are fixedly connected between the second baffle (14) and the first baffle (13). The weight of the second baffle (14) inside the upper air supply duct (9) is less than that of the first baffle (13), and the weight of the second baffle (14) inside the lower air supply duct (9) is greater than that of the first baffle (13), so that the air blown out by the upper air supply duct (9) is always located at the bottom, and the air blown out by the lower air supply duct (9) is always located at the top.

5. A drying apparatus for expanded paper according to claim 4, characterized in that, The first baffle (13) inside the air supply duct (9) is provided with multiple second air outlets (16).

6. A drying apparatus for expanded paper according to claim 4, characterized in that, The first baffle (13) and the second baffle (14) are both arc-shaped plates with multiple sliding balls embedded on their surfaces, so that the first baffle (13) and the second baffle (14) can rotate smoothly in the air supply tube (9).

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