Molded pulp drying device with thermal cycle

Abstract

The utility model discloses a thermal circulation molded pulp drying device, which comprises a drying box, a hot air assembly, a circulation assembly, a conveying assembly and a controller, the drying box comprises a plurality of drying units, and the top of the box body of each drying unit is provided with a first exhaust port and a temperature detector; a plurality of first air inlets are formed in the bottom of a box body of each drying unit, the hot air assembly comprises a plurality of hot air boxes, a hot air box is fixedly installed at the bottom of the box body of each drying unit, the first air inlets communicate with the hot air boxes, and a plurality of electric heating bars are arranged at the bottom of each hot air box. The circulating assembly comprises a plurality of heat exchange boxes, a draught fan is installed on the top of each heat exchange box, heat exchange assemblies are arranged in the heat exchange boxes, outlets of the draught fans are connected with a waste gas pipe, and the heat exchange boxes are connected with a hot air box. The drying device is high in drying efficiency, heat energy in tail gas can be recycled, and energy waste is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of pulp molding product drying equipment, and in particular to a pulp molding drying device with heat circulation. Background Technology

[0002] Pulp molding involves preparing a water-containing fiber pulp with a certain concentration from virgin wood pulp or waste paper through processes such as hydration pulping. This pulp is then vacuum-filtered in a mold to create a wet preform. These wet preforms are then dried and hot-pressed to form finished pulp products. These pulp products are environmentally friendly and provide cushioning and shock absorption, and are generally used for packaging. In this process, the wet preform contains a large portion of water and a small amount of plant fiber. It has high moisture content, a low ignition point, and is a poor conductor of heat, requiring heat drying.

[0003] Existing pulp molding drying equipment typically dries wet preforms by heating them with air. Hot air flows over the surface of the preforms to help them dry quickly, and then the moisture-containing exhaust gas is discharged. However, the exhaust gas still contains a large amount of heat, resulting in significant energy waste and low drying efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a heat-circulating pulp molding drying device with high drying efficiency and the ability to recover and utilize the heat energy in the exhaust gas, thereby reducing energy waste.

[0005] To achieve the above and other related objectives, this utility model provides a heat-circulating pulp molding drying device, comprising: a drying chamber, a hot air assembly, a circulation assembly, a conveying assembly, and a controller. The drying chamber includes several drying units. A first inlet and a first outlet are respectively provided on the end faces of both ends of the drying chamber. The chambers of two adjacent drying units are connected through a material passage. A baffle is provided at each of the first inlet and the first outlet. A first exhaust port and a temperature detector are provided at the top of the chamber of each drying unit. Several first air inlets are provided at the bottom of the chamber of each drying unit. The hot air assembly includes several hot air boxes. One hot air box is fixedly installed at the bottom of the chamber of each drying unit. Several first air inlets are connected to the hot air boxes. Several heating rods are provided at the bottom of each hot air box. The heating rods are arranged along the extension direction of the hot air box and are evenly distributed laterally along the hot air box. The circulation assembly includes several heat exchange boxes, which are respectively installed on the several drying units. The top of each heat exchange box is equipped with a fan. Each heat exchange box has a second exhaust port and a second air inlet at its top and bottom, respectively. Each heat exchange box has a third air inlet and a third exhaust port on its sides. The second air inlet is connected to the first exhaust port. A heat exchange assembly is installed inside each heat exchange box. The second exhaust port is connected to the inlet of the fan, and the outlet of the fan is connected to a waste gas pipe. The third exhaust port is connected to a hot air box via a first pipe. The conveying assembly includes a drive roller, a driven roller, and a support assembly. The drive roller and the driven roller are rotatably connected to the support assembly. The drive roller and the driven roller are located at opposite ends of the drying box. A conveyor belt is installed between the drive roller and the driven roller. The conveyor belt passes sequentially through the first feed inlet, several feed outlets, and the first discharge outlet. The drive roller is driven by a drive device. The controller is electrically connected to several temperature detectors, several heating rods, several fans, and the drive device.

[0006] In one example of the heat-circulating pulp molding and drying device of this utility model, each hot air box is provided with several legs at its bottom, and the several legs are arranged on both sides of the bottom surface of the hot air box along the extension direction of the hot air box.

[0007] In one example of the thermal circulation pulp molding and drying device of this utility model, the bottom surface of the conveyor belt is respectively matched with the box at the bottom of the first inlet and the first outlet, and the bottom of the baffle is matched with the top surface of the conveyor belt.

[0008] In one example of the thermal circulation pulp molding drying device of this utility model, a plurality of first air inlets are evenly distributed at the bottom of the housing of each drying unit, and the plurality of first air inlets cooperate with the conveyor belt.

[0009] In one example of the heat-circulating pulp molding and drying device of this utility model, the heat exchange component includes an air inlet chamber and an exhaust chamber. The air inlet chamber is disposed on the inner wall of the heat exchange box at the second air inlet and is connected to the second air inlet. The exhaust chamber is disposed on the inner wall of the heat exchange box at the second exhaust outlet and is connected to the second exhaust outlet. The air inlet chamber and the exhaust chamber are connected by a plurality of heat exchange tubes, and a plurality of heat exchange fins are provided on the outer wall of each heat exchange tube.

[0010] In one example of the heat-circulating pulp molding and drying device of this utility model, one end of a plurality of heat exchange tubes passes through the end plate of the air inlet chamber and is fixedly connected thereto, the other end of a plurality of heat exchange tubes passes through the end plate of the exhaust chamber and is fixedly connected thereto, and the plurality of heat exchange tubes are evenly distributed in the heat exchange box.

[0011] In one example of the thermal circulation pulp molding drying device of this utility model, the support assembly includes a first support and a second support, the first support and the second support are respectively located at both ends of the drying box, the driving roller is rotatably mounted on the first support, and the driven roller is rotatably mounted on the second support.

[0012] In one example of the thermal circulation pulp molding and drying device of this utility model, the driving device includes a driving motor, the output end of which is connected to the shaft of the driving roller via a belt or chain to drive the driving roller to rotate.

[0013] In one example of the thermal circulation pulp molding and drying device of this utility model, a first pulley is fixedly installed at the output end of the drive motor, and a second pulley is fixedly installed on the shaft of the drive roller. The first pulley and the second pulley are connected by belt drive.

[0014] This utility model relates to a thermal circulation pulp molding drying device. A conveyor assembly transports wet preforms to a drying chamber. Driven by a conveyor belt, the wet preforms pass through several drying units sequentially. A fan draws air from the drying unit chamber and discharges it into a waste gas pipe. Hot air from the hot air chamber enters the drying unit chamber through several first air inlets, forming a hot airflow. This hot airflow passes through the conveyor belt, drying the wet preforms placed on it and removing moisture. The hot airflow is then discharged from the first exhaust port by the fan and enters a heat exchange box. Inside the heat exchange box, the hot airflow exchanges heat with air entering from the third air inlet. The air in the heat exchange box then enters the hot air chamber through the third exhaust port and the first pipe, completing waste heat recovery. A controller can set the drying temperature of several drying units, allowing the drying temperature within each unit to gradually increase, thus ensuring the drying temperature is suitable for different stages of drying the wet preforms, thereby improving drying efficiency and saving energy. Attached Figure Description

[0015] Figure 1 This is a front view of an embodiment of the thermally circulating pulp molding and drying apparatus of this utility model;

[0016] Figure 2 This is a side view of an embodiment of the thermally circulating pulp molding and drying apparatus of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the drying box and hot air box in one embodiment of the heat-circulating pulp molding drying device of this utility model.

[0018] Figure 4 This is a schematic diagram of the internal structure of the heat exchange box in one embodiment of the heat circulation pulp molding and drying device of this utility model.

[0019] Component designation:

[0020] 100 Drying oven; 110 Drying unit; 120 First feed inlet; 130 First discharge outlet; 140 Feed passage; 150 Baffle curtain; 160 First exhaust outlet; 170 Temperature detector; 180 First air inlet; 200 Hot air assembly; 210 Hot air box; 220 Heating rod; 230 Support leg; 300 Circulation assembly; 310 Heat exchange box; 311 Second exhaust outlet; 312 Second air inlet; 313 Third air inlet; 314 Third exhaust outlet; 320 Heat exchanger assembly; 321 Inlet chamber; 322 Exhaust chamber; 323 Heat exchanger tube; 324 Heat exchanger fins; 330 First pipe; 340 Fan; 350 Waste gas pipe; 400 Conveying assembly; 410 Drive roller; 420 Driven roller; 430 Support assembly; 431 First support; 432 Second support; 440 Conveyor belt; 450 Drive device; 451 Drive motor; 452 First pulley; 453 Second pulley; 454 Belt. Detailed Implementation

[0021] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0022] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0023] Please see Figures 1 to 4This utility model provides a heat-circulating pulp molding drying device, which includes: a drying box 100, a hot air assembly 200, a circulation assembly 300, a conveying assembly 400, and a controller. The drying box 100 includes several drying units 110. A first feed inlet 120 and a first discharge outlet 130 are respectively provided on the end faces of both ends of the drying box 100. The boxes of two adjacent drying units 110 are connected through a material passage 140. A baffle curtain 150 is provided at the first feed inlet 120 and the first discharge outlet 130. A first exhaust port 160 and a temperature detector 170 are provided on the top of the box of each drying unit 110. Several first air inlets 180 are provided at the bottom of the box of each drying unit 110. The hot air assembly 200 includes a plurality of hot air boxes 210. Each drying unit 110 has a hot air box 210 fixedly installed at the bottom of its housing. A plurality of first air inlets 180 are connected to the hot air boxes 210. Each hot air box 210 has a plurality of heating rods 220 at its bottom. The heating rods 220 are arranged along the extension direction of the hot air box 210 and are evenly distributed along the transverse direction of the hot air box 210. The circulation assembly 300 includes a plurality of heat exchange boxes 310, which are respectively installed on the top of a plurality of drying units 110. A fan 340 is installed on the top of each heat exchange box 310. Each heat exchange box 310 has a second exhaust port 311 and a second air inlet 312 at its top and bottom, respectively. Each heat exchange box 310 has a third air inlet 313 and a third exhaust port 314 on its two sides, respectively. The second air inlet 312 is connected to the first exhaust port 160. A heat exchange assembly 320 is provided inside the heat exchange box 310. The second exhaust port 311 is connected to the inlet of the fan 340. The outlet of the fan 340 is connected to the exhaust pipe 350. The third exhaust port 314 is connected to a hot air box 210 through a first pipe 330. The conveying assembly 400 includes a drive roller 410, a driven roller 420, and a support assembly 430. The drive roller 410 and the driven roller 420 are rotatably connected to the support assembly 430. The drive roller 410 and the driven roller 420 are located at opposite ends of the drying chamber 100. A conveyor belt 440 is installed between the drive roller 410 and the driven roller 420. The conveyor belt 440 passes sequentially through the first feed inlet 120, a plurality of feed outlets 140, and the first discharge outlet 130. The drive roller 410 is driven and connected to a drive device 450. The controller is electrically connected to a plurality of temperature detectors 170, a plurality of heating rods 220, a plurality of fans 340, and the drive device 450.

[0024] When using this utility model, the drying temperature in several drying units 110 is first set by the controller, and several electric heating rods 220 are controlled to heat the air in the hot air box 210. At the same time, several fans 340 are turned on. Under the action of the fans 340, the air in the drying unit 110 is drawn out and discharged into the exhaust pipe 350. The hot air in the hot air box 210 enters the drying unit 110 through several first air inlets 180. When the hot air passes through the first air inlets 180, it forms a hot airflow. Then, under the action of the fans 340, the hot airflow is discharged from the first exhaust port 160 and enters the heat exchange box 310. Under the action of the heat exchange components 320 in the heat exchange box 310, the hot airflow exchanges heat with the air entering the heat exchange box 310 from the third air inlet 313. The air in the heat exchange box 310 enters the hot air box 210 through the third exhaust port 314 and the first pipe 330, completing the airflow circulation and waste heat recovery. The temperature within several drying units 110 can be monitored by a controller and several temperature sensors 170. Once the temperature within the drying units 110 reaches the set temperature and stabilizes, the wet blanks are placed on the conveyor belt 440. The drive device 450 is activated, driving the drive roller 410 to rotate. The drive roller 410 drives the conveyor belt 440, which transports the wet blanks from the first feed inlet 120 into the drying chamber 100, passing through several drying units 110 sequentially. The dried products are then discharged from the drying chamber 100 from the first discharge outlet 130. A baffle curtain 150 prevents heat leakage from the drying chamber 100. The small opening between adjacent drying units 110 minimizes heat exchange, ensuring temperature stability within each unit. This allows the drying temperature within the drying units 110 to gradually increase, making the drying temperature suitable for different stages of drying, thereby improving drying efficiency and saving energy.

[0025] Please see Figure 1 and Figure 3 In one example of the heat-circulating pulp molding drying device of this utility model, each hot air box 210 is provided with a plurality of support legs 230 at its bottom, and the plurality of support legs 230 are arranged on both sides of the bottom surface of the hot air box 210 along the extending direction of the hot air box 210. The bottom surface of the conveyor belt 440 is respectively engaged with the bottom box of the first feed port 120 and the first discharge port 130, and the bottom of the baffle 150 is engaged with the top surface of the conveyor belt 440. A plurality of first air inlets 180 are evenly distributed at the bottom of the box of each drying unit 110, and the plurality of first air inlets 180 are engaged with the conveyor belt 440.

[0026] Please see Figure 1 and Figure 4In one example of the heat-circulating pulp molding and drying device of this utility model, the heat exchange assembly 320 includes an inlet chamber 321 and an exhaust chamber 322. The inlet chamber 321 is disposed on the inner wall of the heat exchange box 310 at the second air inlet 312 and communicates with the second air inlet 312. The exhaust chamber 322 is disposed on the inner wall of the heat exchange box 310 at the second exhaust outlet 311 and communicates with the second exhaust outlet 311. The inlet chamber 321 and the exhaust chamber 322 are connected by a plurality of heat exchange tubes 323. Each heat exchange tube 323 has a plurality of heat exchange fins 324 on its outer wall. One end of the plurality of heat exchange tubes 323 passes through the end plate of the inlet chamber 321 and is fixedly connected thereto. The other end of the plurality of heat exchange tubes 323 passes through the end plate of the exhaust chamber 322 and is fixedly connected thereto. The plurality of heat exchange tubes 323 are evenly distributed in the heat exchange box 310. The hot airflow inside the drying oven 100 is discharged from the first exhaust port 160 and enters the air inlet chamber 321 through the second air inlet 312. Then it enters the exhaust chamber 322 through several heat exchange tubes 323, and then enters the waste gas pipe 350 through the second exhaust port 311 and the fan 340. Outside air enters the heat exchange box 310 through the third air inlet 313, is heated by the heat exchange tubes 323, and enters the hot air box 210 through the third exhaust port 314 and the first pipe 330, thus completing the utilization of waste heat.

[0027] Please see Figure 1 and Figure 2 In one example of the heat-circulating pulp molding drying device of this utility model, the support assembly 430 includes a first support 431 and a second support 432, which are located at opposite ends of the drying chamber 100. The drive roller 410 is rotatably mounted on the first support 431, and the driven roller 420 is rotatably mounted on the second support 432. The drive device 450 includes a drive motor 451, the output end of which is connected to the shaft of the drive roller 410 via a belt or chain to drive the drive roller 410 to rotate. A first pulley 452 is fixedly mounted on the output end of the drive motor 451, and a second pulley 453 is fixedly mounted on the shaft of the drive roller 410. The first pulley 452 and the second pulley 453 are connected by a belt 454.

[0028] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A heat-circulating pulp molding and drying apparatus, characterized in that, include: A drying oven, comprising several drying units, wherein a first inlet and a first outlet are respectively provided on the end faces of both ends of the drying oven, the bodies of two adjacent drying units are connected through a material passage, and a baffle is provided at the first inlet and the first outlet, wherein a first exhaust port and a temperature detector are provided on the top of the body of each drying unit, and several first air inlets are provided at the bottom of the body of each drying unit. A hot air assembly includes several hot air boxes. Each drying unit has a hot air box fixedly installed at the bottom of its box. Several first air inlets are connected to the hot air boxes. Several electric heating rods are provided at the bottom of each hot air box. The electric heating rods are arranged along the extension direction of the hot air box and are evenly distributed along the transverse direction of the hot air box. A circulation assembly includes several heat exchange boxes, which are respectively installed on top of several drying units. A fan is installed on the top of each heat exchange box. Each heat exchange box has a second exhaust port and a second air inlet at its top and bottom, respectively. A third air inlet and a third exhaust port are respectively provided on both sides of each heat exchange box. The second air inlet is connected to the first exhaust port. A heat exchange component is provided inside the heat exchange box. The second exhaust port is connected to the inlet of the fan. The outlet of the fan is connected to the exhaust pipe. The third exhaust port is connected to a hot air box through a first pipe. The conveying assembly includes a drive roller, a driven roller, and a support assembly. The drive roller and the driven roller are rotatably connected to the support assembly. The drive roller and the driven roller are located at opposite ends of the drying chamber. A conveyor belt is installed between the drive roller and the driven roller. The conveyor belt passes sequentially through the first feed inlet, a plurality of feed outlets, and the first discharge outlet. The drive roller is driven and connected to a driving device. The controller is electrically connected to a plurality of the temperature detectors, a plurality of the heating rods, a plurality of the fans and the drive device.

2. The thermally circulated pulp molding and drying apparatus as described in claim 1, characterized in that, Each of the hot air boxes has several legs at its bottom, and the legs are arranged on both sides of the bottom surface of the hot air box along the extension direction of the hot air box.

3. The heat-circulating pulp molding and drying apparatus as described in claim 1, characterized in that, The bottom surface of the conveyor belt mates with the boxes at the bottom of the first inlet and the first outlet, respectively, and the bottom of the baffle mates with the top surface of the conveyor belt.

4. The heat-circulating pulp molding and drying apparatus as described in claim 1, characterized in that, Several first air inlets are evenly distributed at the bottom of the housing of each drying unit, and several first air inlets cooperate with the conveyor belt.

5. The heat-circulating pulp molding and drying apparatus as described in claim 1, characterized in that, The heat exchange assembly includes an air inlet chamber and an exhaust chamber. The air inlet chamber is disposed on the inner wall of the heat exchange box at the second air inlet and is connected to the second air inlet. The exhaust chamber is disposed on the inner wall of the heat exchange box at the second exhaust outlet and is connected to the second exhaust outlet. The air inlet chamber and the exhaust chamber are connected by a plurality of heat exchange tubes, and a plurality of heat exchange fins are provided on the outer wall of each heat exchange tube.

6. The heat-circulating pulp molding and drying apparatus as described in claim 5, characterized in that, One end of each heat exchange tube passes through the end plate of the air inlet chamber and is fixedly connected thereto. The other end of each heat exchange tube passes through the end plate of the exhaust chamber and is fixedly connected thereto. The heat exchange tubes are evenly distributed inside the heat exchange box.

7. The thermally circulated pulp molding and drying apparatus as described in claim 1, characterized in that, The support assembly includes a first support and a second support, which are located at opposite ends of the drying chamber. The drive roller is rotatably mounted on the first support, and the driven roller is rotatably mounted on the second support.

8. The thermally circulated pulp molding and drying apparatus as described in claim 7, characterized in that, The driving device includes a drive motor, the output end of which is connected to the shaft of the drive roller via a belt or chain to drive the drive roller to rotate.

9. The heat-circulating pulp molding and drying apparatus as described in claim 8, characterized in that, The output end of the drive motor is fixedly mounted with a first pulley, and the shaft of the drive roller is fixedly mounted with a second pulley. The first pulley and the second pulley are connected by belt drive.

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