A preheating device for printing packaging bags

Abstract

This utility model discloses a preheating device for printing packaging bags, relating to the field of packaging bag printing technology. It includes a support frame, inside which a conveying module is fixedly connected. A hot air heating module is fixedly connected above the support frame, and a windbreak curtain is fixedly connected above the conveying module. A heat exchange module is fixedly connected below the conveying module. During use, preheated high-temperature exhaust gas enters the heat exchange pipe through an air supply pipe. As the exhaust gas flows within the heat exchange pipe, heat is transferred through the pipe wall to the heat sink on the outside, raising the temperature of the heat sink. Simultaneously, outside cold air, under the negative pressure of a fan, enters the heat exchange module through air inlets on both sides of the support frame and flows through the high-temperature heat sink to preheat the cold air. The preheated cold air then flows directly to the electric heating tube below the support frame, reducing the heating load on the electric heating tube.

Description

Technical Field

[0001] This utility model relates to a printing preheating device for packaging bags, and to the field of packaging bag printing technology, specifically to a printing preheating device for packaging bags. Background Technology

[0002] In the packaging bag printing production process, the substrates such as plastic film and composite film need to be pre-treated before printing. The core requirements are to remove the moisture absorbed by the substrate during storage by preheating, improve the flatness of the substrate, optimize the ink adhesion and stabilize the size of the substrate, so as to create stable conditions for subsequent printing processes and avoid quality problems such as misalignment of printed patterns, ink removal, bubbles or pinholes caused by poor substrate condition.

[0003] However, traditional devices mostly discharge the high-temperature exhaust gas generated during the heating process directly without recovering and utilizing its heat. This causes the heating unit to continuously consume a large amount of energy to maintain the target temperature, increasing production energy consumption and costs. Furthermore, when the high-temperature exhaust gas is discharged, it is easy to condense into condensate in the pipe. If it is not collected and discharged in time, it may flow back and drip onto the substrate, affecting the ink adhesion of the substrate. Utility Model Content

[0004] This utility model provides a printing preheating device for packaging bags. One purpose is to have a heat recovery function to solve the problem that traditional devices do not recover and reuse heat from exhaust gas. Another purpose is to solve the problem of condensation in the exhaust pipe, so as to avoid secondary moisture absorption of the substrate.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A printing preheating device for packaging bags includes a support frame, a conveying module fixedly connected inside the support frame, a hot air heating module fixedly connected above the support frame, a windbreak curtain fixedly connected above the conveying module, and a heat exchange module fixedly connected below the conveying module.

[0007] A further improvement of the present invention is that the conveying module includes a first fixed frame and a second fixed frame. A motor fixing frame is fixedly connected to the right side of the first fixed frame. A motor is fixedly connected to the motor fixing frame below the second fixed frame. A pulley is fixedly connected to the output shaft of the motor. A drive roller is rotatably connected between the second fixed frame and the first fixed frame. A pulley is provided on the outside of the second fixed frame. The pulley of the second fixed frame and the first pulley are driven by a belt.

[0008] A further improvement of the present invention is that: a driven roller is rotatably connected to the first fixed frame and the second fixed frame at the end away from the drive roller; a grid conveyor belt is sleeved on the outside of the driven roller and the drive roller; a row of support rollers is rotatably connected inside the grid conveyor belt of the first fixed frame and the second fixed frame; and a row of hot air guide plates is fixedly connected to the first fixed frame and the second fixed frame below the support rollers.

[0009] A further improvement of the present invention is that the heat exchange module includes a second support frame, which is located below the conveying module and is fixedly connected to the first support frame. The second support frame has an air inlet inside and several heat sinks are fixedly connected below the air inlet. Several heat exchange pipes are fixedly connected between the heat sinks. Air inlet plates are fixedly connected to both the left and right sides of the second support frame, and a base is fixedly connected to the second support frame below the air inlet plates.

[0010] A further improvement of this utility model is that: the hot air heating module includes an exhaust pipe and an air supply pipe, the air supply pipe and the exhaust pipe are respectively located on the front and rear sides of the support frame one and fixedly connected to the support frame one; the support frame one has an air intake at the top of the conveying module and is fixedly connected to the air inlet of the air supply pipe; several heat exchange pipes are fixedly connected to the air outlet of the hot air heating module; the other end of several heat exchange pipes is fixedly connected to the air inlet of the exhaust pipe; a water collection tank is fixedly connected below the air inlet of the exhaust pipe; the bottom of the water collection tank is inclined to the horizontal plane and a drain valve is fixedly connected at the lowest point; and an electric heating tube is fixedly connected above the air inlet of the support frame one.

[0011] A further improvement of this utility model is that a fixing frame three is fixedly connected above the exhaust port of the exhaust pipe, and a fan is fixedly connected below the fixing frame three.

[0012] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0013] 1. This utility model provides a printing preheating device for packaging bags. When the device is in use, the preheated high-temperature exhaust gas enters the heat exchange pipe through the gas supply pipe. When the exhaust gas flows in the heat exchange pipe, the heat is transferred to the heat sink on the outside through the pipe wall, causing the temperature of the heat sink to rise. At the same time, the outside cold air enters the heat exchange module through the air inlet plates on both sides of the support frame under the negative pressure of the fan, and flows through the high-temperature heat sink to preheat the cold air. The preheated cold air flows directly to the electric heating tube below the support frame, reducing the heating load of the electric heating tube.

[0014] 2. This utility model provides a printing preheating device for packaging bags. A water collection tank is fixedly connected below the air inlet of the exhaust pipe. When the high-temperature exhaust gas flows through the exhaust pipe, the water vapor in it condenses into liquid condensate due to the temperature drop. Under the action of gravity, it drips down naturally. The water collection tank can directly receive this condensate and prevent it from flowing back to the preheating zone or heat exchange module along the inner wall of the pipe. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the printing preheating device for the packaging bag of this utility model;

[0016] Figure 2 This is a schematic diagram of the power transmission structure of the conveying module of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the conveying module of this utility model;

[0018] Figure 4 This is a schematic diagram of the heat exchange module of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the hot air heating module of this utility model;

[0020] Figure 6 This is a schematic diagram of the exhaust pipe structure of this utility model.

[0021] In the diagram: 1. Support frame one; 2. Windshield curtain; 3. Conveying module; 4. Heat exchange module; 5. Hot air heating module; 31. Fixing frame one; 32. Fixing frame two; 33. Drive roller; 34. Motor; 35. Motor fixing frame; 36. Pulley one; 37. Support roller; 38. Hot air guide plate; 39. Driven roller; 41. Support frame two; 42. Heat exchange pipe; 43. Heat sink; 44. Air inlet plate; 45. Base; 51. Exhaust pipe; 52. Electric heating tube; 53. Water collection tank; 54. Drain valve; 55. Air supply pipe; 56. Fan; 57. Fixing frame three. Detailed Implementation

[0022] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following describes this utility model in conjunction with specific embodiments:

[0023] like Figure 1As shown, this utility model provides a printing preheating device for packaging bags, including a support frame 1, a conveying module 3 fixedly connected inside the support frame 1, a hot air heating module 5 fixedly connected above the support frame 1, a windbreak curtain 2 fixedly connected above the conveying module 3 on the support frame 1, and a heat exchange module 4 fixedly connected below the conveying module 3 on the support frame 1. The windbreak curtain 2 fixed above the conveying module 3 on the support frame 1 can form a closed preheating area, preventing hot air from dissipating to the outside during the preheating process of the substrate, maintaining a stable preheating temperature, and preventing external dust and impurities from entering the preheating area and contaminating the substrate.

[0024] like Figure 2 As shown, this utility model provides a technical solution: the conveying module 3 includes a first fixed frame 31 and a second fixed frame 32. A motor fixed frame 35 is fixedly connected to the right side of the first fixed frame 1. A motor 34 is fixedly connected to the motor fixed frame 35 below the second fixed frame 32. A pulley 36 is fixedly connected to the output shaft of the motor 34. A drive roller 33 is rotatably connected between the second fixed frame 32 and the first fixed frame 31. A pulley is provided on the outside of the second fixed frame 32. The pulley of the second fixed frame 32 and the pulley 36 are driven by a belt. The first fixed frame 31 and the second fixed frame 32 are symmetrically distributed to provide rotational support for the drive roller 33 and the driven roller 39, avoiding the misalignment of the roller shaft during transmission and causing the substrate to deviate. When the motor 34 is powered on, the output shaft drives the pulley 36 at its end to rotate. Then, the pulley 36 is driven by the belt and the pulley on the outside of the drive roller 33 to transmit the power of the motor 34 to the drive roller 33, so that the drive roller 33 rotates around its own axis.

[0025] like Figure 3 As shown, this utility model provides a technical solution: a driven roller 39 is rotatably connected to a fixed frame 31 and a fixed frame 32 at the end away from the drive roller 33. A grid conveyor belt is sleeved on the outside of the driven roller 39 and the drive roller 33. A row of support rollers 37 is rotatably connected inside the grid conveyor belt of the fixed frame 31 and the fixed frame 32. A row of hot air guide plates 38 is fixedly connected below the support rollers 37 of the fixed frame 31 and the fixed frame 32. The row of support rollers 37 rotatably connected inside the grid conveyor belt can play a supporting role when the conveyor belt carries the substrate, ensuring that the substrate is in a flat state. When the hot air below flows upward, the hot air guide plates 38 guide the strong vertical airflow into an oblique airflow, preventing the vertical airflow from blowing the substrate away.

[0026] like Figure 4As shown, this utility model provides a technical solution: the heat exchange module 4 includes a second support frame 41, which is located below the conveying module 3 and fixedly connected to the first support frame 1. The second support frame 41 has an air inlet inside and several heat sinks 43 are fixedly connected below the air inlet. Several heat exchange pipes 42 are fixedly connected between the heat sinks 43. Air inlet plates 44 are fixedly connected to both the left and right sides of the second support frame 41. A base 45 is fixedly connected to the second support frame 41 below the air inlet plates 44. The heat exchange pipes 42 are filled with high-temperature exhaust gas discharged from the hot air heating module 5. The heat is transferred to the heat sinks 43 through the pipe wall, causing the temperature of the heat sinks 43 to rise. When the cold air entering from the air inlet plate 44 flows through the heat sinks 43, it will exchange heat with the high-temperature heat sinks 43, so that the cold air is preheated, thereby reducing the heating load of the subsequent electric heating tube 52.

[0027] like Figure 5 As shown, this utility model provides a technical solution: the hot air heating module 5 includes an exhaust pipe 51 and an air supply pipe 55. The air supply pipe 55 and the exhaust pipe 51 are located on the front and rear sides of the support frame 1 respectively and are fixedly connected to the support frame 1. The support frame 1 has an air intake at the top of the conveying module 3 and is fixedly connected to the air inlet of the air supply pipe 55. Several heat exchange pipes 42 are fixedly connected to the air outlet of the hot air heating module 5. The other end of several heat exchange pipes 42 is fixedly connected to the air inlet of the exhaust pipe 51. A water collection tank 53 is fixedly connected below the air inlet of the exhaust pipe 51. The bottom of the water collection tank 53 is inclined to the horizontal plane and a drain valve is fixedly connected at the lowest point. Door 54, support frame 1 is fixedly connected to the air inlet of support frame 2 41 with electric heating tube 52. When the cold air preheated by the heat exchange module 4 flows upward to the vicinity of the electric heating tube 52, it will be further heated into hot air. Then, under the negative pressure of the fan 56, the hot air flows upward to the substrate of the conveying module 3. After preheating, the hot air carrying the moisture evaporated from the substrate enters the air supply pipe 55 through the air intake at the top of support frame 1. When the high temperature waste air flows through the exhaust pipe 51, the water vapor condenses into liquid condensate due to the temperature drop. The water collection tank 53 fixed below the air inlet of the exhaust pipe 51 can collect the condensate. Its inclined bottom can gather the condensate to the drain valve 54.

[0028] like Figure 6 As shown, this utility model provides a technical solution: a fixing bracket 3 57 is fixedly connected above the exhaust port of the exhaust pipe 51, and a fan 56 is fixedly connected below the fixing bracket 3 57. The fixing bracket 3 57 is fixed above the exhaust port of the exhaust pipe 51. When the fan 56 fixed below it is powered on, it generates a continuous negative pressure through the exhaust port of the exhaust pipe 51. At the same time, the fixing bracket 3 57 also provides support for the fan 56.

[0029] The working principle of the printing preheating device for this packaging bag will be explained in detail below.

[0030] like Figure 1-6As shown, when preheating is required, the motor 34 on the motor mounting bracket 35 is started. The output shaft of the motor 34 drives the pulley 36 to rotate. Then, the pulley 36 drives the drive roller 33 on the outside of the drive roller 33 through the belt, thereby driving the drive roller 33 between the mounting bracket 31 and the mounting bracket 32 ​​to rotate. The drive roller 33 drives the grid conveyor belt and the driven roller 39 to rotate synchronously through the friction with the grid conveyor belt. At the same time, a row of support rollers 37 inside the grid conveyor belt rotates with the conveyor belt, playing a role in supporting the conveyor belt. Then, the fan 56 under the mounting bracket 37 is started. The fan 56 generates negative pressure through the exhaust port of the exhaust pipe 51, providing continuous suction for the hot air circulation of the entire device. The cold air from the outside is drawn in by the fan. Under negative pressure, air enters the air inlet inside the support frame 41 through the air inlet plates 44 on both sides of the support frame 41 in the heat exchange module 4. When the cold air flows through the heat sink 43 below the air inlet, it exchanges heat with the heat exchange pipe 42 between the heat sink 43 and the heat exchange pipe 42. The heat exchange pipe 42 carries the high-temperature exhaust gas discharged from the subsequent stage. Its heat is transferred to the heat sink 43 through the pipe wall and then to the cold air, preheating the cold air, completing the waste heat recovery, and reducing the energy consumption of the subsequent heating stage. The cold air, after being preheated by waste heat recovery, continues to flow upward and reaches the area below the support frame 1 and above the air inlet of the support frame 41, where it comes into contact with the electric heating tube 52. The electric heating tube 52 is energized and heats up, preheating the cold air. The cold air is further heated to the target preheating temperature, generating high-temperature hot air. Under the negative pressure of the fan 56, the high-temperature hot air continues to rise, flowing past a row of hot air guide plates 38 below the support rollers 37 in the conveying module 3. The hot air guide plates 38 are inclined, guiding the vertically upward hot air into an oblique airflow. This avoids the strong vertical airflow blowing away the thin substrate and allows the hot air to more evenly cover the perforated area of ​​the grid conveyor belt. The obliquely flowing high-temperature hot air penetrates the perforated structure of the grid conveyor belt and acts on the substrate from below. Simultaneously, the windbreak curtain 2 fixed above the conveying module 3 by the support frame 1 forms a closed preheating space, reducing the loss of hot air to the outside and ensuring a stable temperature in the preheating area. The hot air envelops the substrate within the closed space. The material is heated, and the preheated hot air carries the moisture evaporated from the substrate. Under the negative pressure of the fan 56, it enters the air supply pipe 55 through the air intake at the top of the support frame 1. Then, the air supply pipe 55 transports the high-temperature exhaust gas containing moisture to the inlet of the heat exchange pipe 42 of the heat exchange module 4. After the exhaust gas enters the heat exchange pipe 42, its heat is transferred to the cold air entering below through the pipe wall and heat sink 43. At the same time, its own temperature gradually decreases. The exhaust gas that has completed the heat transfer flows into the exhaust pipe 51 from the other end of the heat exchange pipe 42. Finally, under the action of the fan 56, part of it is discharged through the exhaust port of the exhaust pipe 51. When the high-temperature exhaust gas flows through the exhaust pipe 51, the water vapor in it condenses into liquid condensate due to the temperature drop.Condensate flows into the water collection chamber 53 below the air inlet of the exhaust pipe 51 under gravity. The bottom of the water collection chamber 53 is designed to slope, with the lowest point facing the drain valve 54. By periodically opening the drain valve 54, the condensate in the water collection chamber 53 is drained, preventing backflow of condensate.

[0031] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A printing preheating device for packaging bags, comprising a support frame (1), characterized in that: The support frame (1) is fixedly connected to a conveying module (3), a hot air heating module (5) is fixedly connected above the support frame (1), a windproof curtain (2) is fixedly connected above the conveying module (3) on the support frame (1), and a heat exchange module (4) is fixedly connected below the conveying module (3) on the support frame (1).

2. A printing preheating device for packaging bags according to claim 1, characterized in that: The conveying module (3) includes a first fixed frame (31) and a second fixed frame (32). A motor fixed frame (35) is fixedly connected to the right side of the first fixed frame (1). A motor (34) is fixedly connected to the second fixed frame (32) below the motor fixed frame (35). A pulley (36) is fixedly connected to the output shaft of the motor (34). A drive roller (33) is rotatably connected between the second fixed frame (32) and the first fixed frame (31). A pulley is provided on the outside of the second fixed frame (32). The pulley of the second fixed frame (32) and the pulley (36) are driven by a belt.

3. A printing preheating device for packaging bags according to claim 2, characterized in that: The first fixed frame (31) and the second fixed frame (32) are rotatably connected to a driven roller (39) at the end away from the drive roller (33). A grid conveyor belt is sleeved on the outside of the driven roller (39) and the drive roller (33). A row of support rollers (37) is rotatably connected inside the grid conveyor belt of the first fixed frame (31) and the second fixed frame (32). A row of hot air guide plates (38) is fixedly connected below the support rollers (37) of the first fixed frame (31) and the second fixed frame (32).

4. A printing preheating device for packaging bags according to claim 3, characterized in that: The heat exchange module (4) includes a second support frame (41), which is located below the conveying module (3) and is fixedly connected to the first support frame (1). The second support frame (41) has an air inlet inside and several heat sinks (43) are fixedly connected below the air inlet. Several heat exchange pipes (42) are fixedly connected between the heat sinks (43). Air inlet plates (44) are fixedly connected on both the left and right sides of the second support frame (41). A base (45) is fixedly connected below the air inlet plates (44) of the second support frame (41).

5. A printing preheating device for packaging bags according to claim 4, characterized in that: The hot air heating module (5) includes an exhaust pipe (51) and an air supply pipe (55). The air supply pipe (55) and the exhaust pipe (51) are located on the front and rear sides of the support frame (1) and are fixedly connected to the support frame (1). The support frame (1) has an air intake at the top of the conveying module (3) and is fixedly connected to the air inlet of the air supply pipe (55). Several heat exchange pipes (42) are fixedly connected to the air outlet of the hot air heating module (5). The other end of several heat exchange pipes (42) is fixedly connected to the air inlet of the exhaust pipe (51). The exhaust pipe (51) has a water collection tank (53) fixedly connected below the air inlet. The bottom of the water collection tank (53) is inclined to the horizontal plane and a drain valve (54) is fixedly connected at the lowest point. The support frame (1) has an electric heating tube (52) fixedly connected above the air inlet of the support frame (41).

6. The printing preheating device for packaging bags according to claim 5, characterized in that: The exhaust pipe (51) is fixedly connected with a fixed frame three (57) above the exhaust port, and the lower part of the fixed frame three (57) is fixedly connected with a fan (56).

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