Explosion-proof structure of drying oven of casting machine

Abstract

The utility model discloses an explosion-proof structure of a casting machine drying oven, a casting machine comprises a driving rotary drum, a driven rotary drum and a steel belt which is in transmission connection with the driving rotary drum and the driven rotary drum, and the casting machine drying oven comprises a drying tunnel which is positioned outside the steel belt; a plurality of temperature zones are divided in the drying tunnel, and explosion venting ports are at least formed in the first temperature zone and / or the second temperature zone close to the inlet side of the drying tunnel on a box body of the casting machine drying oven. And a temperature detection device for detecting the temperature of the steel belt and / or a concentration detection device for detecting the solvent gas concentration of the film raw material are / is also arranged in the temperature zone. The anti-explosion structure of the drying oven of the casting machine divides the drying tunnel into a plurality of temperature zones for respectively controlling the temperature and monitoring the state; according to the scheme, the explosion venting opening is arranged to relieve pressure under the extreme condition, the scheme is based on multiple angles, measures can be conveniently and timely taken in multiple stages formed by gradual evolution under the extreme condition, and therefore the safety of equipment and personnel is effectively guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of casting machine technology, and specifically relates to an explosion-proof structure for a casting machine oven. Background Technology

[0002] A casting machine is a type of film manufacturing equipment. Existing technologies include, for example, Chinese invention patent application publication number CN104960127A. The basic principle of the casting machine's oven is to use hot air to initially dry the film slurry on a steel belt, causing the solvent to evaporate and the film to begin hardening, making it ready for peeling. Taking the chemical production of polyimide film as an example, the feed material to the casting machine contains solvent. After heating, the solvent evaporates and needs to be discharged promptly, ensuring its concentration and pressure remain within safe ranges; otherwise, a fire or explosion may occur. Currently, domestic casting machines are not yet mature in the chemical production of cast films, especially in areas requiring high heating temperatures and high solvent evaporation efficiency while ensuring solvent gas stability and safety. Therefore, an improved, novel casting machine oven structure is needed. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an explosion-proof structure for a casting machine oven, which solves the problem that existing solutions cannot simultaneously guarantee solvent evaporation efficiency and safety, enables more detailed division and temperature control of the oven, as well as status monitoring, and ensures timely pressure relief in extreme situations to avoid major accidents.

[0004] According to the technical solution of this utility model, this utility model provides an explosion-proof structure for a casting machine oven. The casting machine includes an active drum, a passive drum, and a steel belt connected to the active drum and the passive drum. The casting machine oven includes a drying tunnel located outside the steel belt. The drying tunnel is divided into multiple temperature zones. The oven body is provided with explosion vents at least in the first temperature zone and / or the second temperature zone near the entrance of the drying tunnel. Temperature detection devices for detecting the temperature of the steel belt and / or concentration detection devices for detecting the concentration of solvent gas in the film raw materials are also provided in the temperature zones.

[0005] Furthermore, it also includes an automatic alarm device to prevent concealment, a temperature detection device and / or a concentration detection device, and an explosion vent that is connected to the automatic alarm device to prevent concealment.

[0006] Furthermore, the temperature zones are divided by partitions within the drying tunnel, with a connecting opening in the middle of the partition for the steel strip to pass through.

[0007] Furthermore, a negative pressure air curtain device is provided at the connection port. The negative pressure air curtain device includes a first exhaust section and a second exhaust section arranged vertically opposite each other, and a channel space is formed between the first exhaust section and the second exhaust section for the steel belt to pass through.

[0008] Furthermore, the top of the casting machine oven is equipped with an exhaust vent and an air inlet.

[0009] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0010] The explosion-proof structure of the casting machine oven of this utility model divides the drying tunnel into multiple temperature zones for temperature control and status monitoring, and is equipped with explosion vents for pressure relief in extreme situations. This solution is based on multiple perspectives and can facilitate timely measures to be taken in the multiple stages of extreme situations, thereby effectively ensuring the safety of equipment and personnel. Attached Figure Description

[0011] Figure 1 This is a cross-sectional schematic diagram of the explosion-proof structure of a casting machine oven according to an embodiment of the present invention.

[0012] Figure 2 This is a three-dimensional structural diagram of a casting machine according to an embodiment of the present invention.

[0013] Figure 3 This is a three-dimensional structural diagram of a negative pressure air curtain device according to an embodiment of the present utility model.

[0014] Figure 4 This is a cross-sectional schematic diagram of the temperature zone structure of the casting machine oven according to a preferred embodiment of the present utility model.

[0015] Explanation of reference numerals in the attached figures:

[0016] 1. Active rotating drum; 2. Passive rotating drum; 3. Steel belt; 4. Temperature zone; 5. Explosion vent; 6. Temperature detection device; 7. Concentration detection device; 8. Auxiliary temperature control device; 9. Baffle; 10. Negative pressure air curtain device; 12. First exhaust section; 13. Air curtain flow equalization plate; 14. Second exhaust section; 21. First temperature zone; 22. Second temperature zone; 23. Third temperature zone; 24. Fourth temperature zone; 25. Fifth temperature zone; 26. Sixth temperature zone; 27. Seventh temperature zone. Detailed Implementation

[0017] This invention provides an explosion-proof structure for a casting machine oven, solving the problem that existing solutions cannot simultaneously guarantee solvent evaporation efficiency and safety. It enables more detailed division and temperature control of the oven, as well as status monitoring, and ensures timely pressure relief in extreme situations to prevent major accidents. This solution is primarily aimed at applications such as the chemical production of cast films, where volatile solvents are flammable and explosive.

[0018] Please see Figure 1This utility model discloses an explosion-proof structure for a casting machine oven according to an embodiment of the present invention. The casting machine includes a transversely distributed active drum 1, a passive drum 2, and a steel belt 3 connected to the active drum 1 and the passive drum 2. The casting machine oven includes a drying tunnel located outside the steel belt 3, more specifically including an upper drying tunnel corresponding to a straight section above the steel belt 3 and a lower drying tunnel corresponding to a straight section above the steel belt 3, which are sealed and heat-insulatedly separated. Multiple temperature zones 4 are divided within the drying tunnel. At least one explosion vent 5 is provided on the oven body near the first temperature zone and / or the second temperature zone on the side closest to the drying tunnel inlet (upper drying tunnel inlet). The explosion vent 5 can adopt an existing structure, such as having an explosion vent plate, to promptly vent the explosion in the event of a deflagration. In temperature zone 4, a temperature detection device 6 (e.g., an infrared thermometer positioned facing the back of the steel strip 3) is also provided for detecting the temperature of the steel strip, and / or a concentration detection device 7 (e.g., a gas detector or pressure gauge) is provided for detecting the concentration of solvent gas in the film raw material. In existing solutions, only the air temperature inside the oven is typically considered, neglecting the actual temperature of the steel strip. If the steel strip temperature is too high, combustion can easily occur; furthermore, monitoring the solvent concentration and gas pressure can also warn of the risk of combustion and explosion.

[0019] Specifically, for example Figure 1 In the illustrated embodiment, the upper drying tunnel has two temperature zones, and preferably, explosion vents 5 are provided in both temperature zones. For example, the explosion vents 5 are located on the top surface of the chamber. Furthermore, Figure 4 In the illustrated embodiment, the casting machine oven has seven temperature zones, including a first temperature zone 21, a second temperature zone 22, and a third temperature zone 23 located in the upper drying tunnel, a fourth temperature zone 24 located in the passive drum chamber, and a fifth temperature zone 25, a sixth temperature zone 26, and a seventh temperature zone 27 located in the lower drying tunnel. These seven temperature zones are connected sequentially along the direction of film movement. The first two temperature zones at the entrance of the upper drying tunnel have the largest amount of evaporated solvent gas and are most likely to accumulate chemical solvents. The solvent concentration in the subsequent temperature zones generally shows a gradually decreasing trend. Therefore, this solution provides explosion vents 5 in the first temperature zone (first temperature zone 21) and the second temperature zone (second temperature zone 22), and each of these two temperature zones has at least one explosion vent 5. The third temperature zone 23 and subsequent temperature zones can be selected to have explosion vents 5 depending on the specific situation and requirements.

[0020] More specifically, in Figure 4In the illustrated embodiment, an active rotating drum chamber is provided on one side of the upper and lower drying tunnels, and a passive rotating drum chamber is provided on the other side; the active rotating drum 1 is located in the active rotating drum chamber, and the passive rotating drum 2 is located in the passive rotating drum chamber. The fourth temperature zone 24 contains, for example, a far-infrared heating device or a ceramic heating device. Far-infrared or ceramic heating is used to heat the film and steel belt at the passive rotating drum. The fourth temperature zone 24 is located between the upper and lower drying tunnels in the film conveying path. In existing equipment, there is no heating device in the passive rotating drum chamber; insulation relies solely on the box structure. The film temperature will decrease after passing through this section, and when it enters the temperature zone of the lower drying tunnel, the film temperature will change abruptly, affecting process quality. This solution achieves more precise temperature control, allowing the film temperature to change almost continuously, avoiding abrupt temperature changes that could affect film quality. Furthermore, the first temperature zone 21 preferably uses a bellows that is generally parallel to the steel belt to blow preheating air that is generally parallel to the membrane surface, so as to avoid the wind speed affecting the appearance quality of the unformed film. After passing through the first temperature zone 21, the membrane surface has hardened to a certain extent. The subsequent temperature zones can use the bellows air supply method in the existing equipment, such as blowing hot air generally perpendicular to the membrane surface.

[0021] In some embodiments, an auxiliary temperature control device 8 for adjusting the temperature of the steel strip is also provided in the temperature zone 4. The auxiliary temperature control device 8 is, for example, a non-contact heating plate, which is located on the back side of the steel strip 3. By adjusting the output temperature of the auxiliary temperature control device 8, the steel strip 3 can be directly heated or cooled to a certain extent, making the temperature control of the steel strip more precise and flexible.

[0022] Preferably, the system also includes an automatic alarm device to prevent concealment. The temperature detection device 6 and / or concentration detection device 7, as well as the explosion vent 5, are all connected to the automatic alarm device. This automatic alarm device is connected to the main control equipment or the system of the parent company / regulatory department, thereby enabling automatic alarms or fault information uploads when detected temperature / concentration levels exceed limits or when an explosion occurs, to prevent concealment. It is understood that monitoring the status of the explosion vent 5 can be achieved, for example, by placing a sensor near the explosion vent. When the explosion vent breaks, the sensor will be triggered (for example, when the explosion vent breaks, the air pressure outside the explosion vent will undergo a significant change).

[0023] In a more specific embodiment, temperature zone 4 is divided by a partition 9 within the drying tunnel. The partition 9 has a connecting opening in the middle for the steel strip 3 (and film) to pass through. The partition 9 can act as a windbreak, isolating the environments of different temperature zones to a certain extent. Preferably, a negative pressure air curtain device 10 is provided at the connecting opening. The negative pressure air curtain device 10 includes a first exhaust section 12 and a second exhaust section 14 arranged vertically opposite each other, forming a channel space between the first exhaust section and the second exhaust section for the steel strip to pass through. The principle of this preferred embodiment is that the adjacent sides of each temperature zone in the drying oven allow the steel strip to pass through only through the channel space (connecting opening), while the rest are sealed. During operation, the first exhaust section 12 and the second exhaust section 14 simultaneously exhaust air. When the airflow flows towards the partition between adjacent temperature zones, the airflow is drawn away by the first exhaust section 12 and the second exhaust section 14 on both sides, thereby preventing the airflow from entering adjacent spaces and preventing temperature cross-contamination. Therefore, the temperature and solvent gas content of each temperature zone are well controllable.

[0024] Please see Figure 3 The negative pressure air curtain device 10 preferably adopts a static pressure box structure. The first exhaust section 12 and the second exhaust section 14 are both located on the air curtain static pressure box, and air curtain flow equalization plates 13 are provided at both the first exhaust section 12 and the second exhaust section 14. The air curtain flow equalization plates 13 can make the air velocity uniform. Without the flow equalization plates, there will be problems such as the air velocity being higher closer to the exhaust port (such as the exhaust duct) and not being able to be extracted further away from the exhaust port (such as the exhaust duct). Moreover, the membrane will not be subjected to strong airflow impact when passing through, and it also further improves the ventilation effect in the space. It should be noted that the main ventilation and timely removal of solvent are still achieved by other ventilation systems. The negative pressure air curtain device 10 mainly serves as a temperature zone isolation.

[0025] Please see Figure 1 , Figure 2 The ventilation system also includes an exhaust vent and an air inlet on the top of the casting machine oven. Preferably, the exhaust vent is located near the partition 9 on the oven body. This design places the exhaust vent in a dead corner of the oven, where the evaporated solvent tends to stagnate and accumulate. This focuses on exhausting from these solvent-prone areas, ensuring airflow in the dead corners, improving the efficiency and effectiveness of solvent removal, and effectively preventing solvent explosion. Furthermore, the concentration detection device 7 and the explosion vent 5 can also be optionally placed in these dead corners. The oven air inlet supplies air to the air box inside the casting machine to blow hot air into the oven, achieving a film heating effect. These parts can utilize existing technologies or other feasible solutions and are not the focus of this improvement; therefore, they will not be elaborated upon further. Figure 1 The text omits components such as the bellows inside the oven.

[0026] In summary, the explosion-proof structure of the casting machine oven of this utility model divides the drying tunnel into multiple temperature zones for temperature control and status monitoring, and is equipped with an explosion vent for pressure relief in extreme situations. This solution is based on multiple perspectives and can facilitate timely measures to be taken in the multiple stages of extreme situations, thereby effectively ensuring the safety of equipment and personnel.

Claims

1. An explosion-proof structure for a casting machine oven, characterized in that, The casting machine includes an active drum (1), a passive drum (2), and a steel belt (3) connected to the active drum (1) and the passive drum (2). The casting machine oven includes a drying tunnel located outside the steel belt (3). The drying tunnel is divided into multiple temperature zones (4). The casting machine oven body is provided with a vent (5) at least in the first temperature zone and / or the second temperature zone near the entrance of the drying tunnel. The temperature zone (4) is also provided with a temperature detection device (6) for detecting the temperature of the steel belt and / or a concentration detection device (7) for detecting the concentration of solvent gas in the film raw material.

2. The explosion-proof structure of the casting machine oven according to claim 1, characterized in that, It also includes an automatic alarm device to prevent concealment, a temperature detection device (6) and / or a concentration detection device (7), and an explosion vent (5) that are all connected to the automatic alarm device to prevent concealment.

3. The explosion-proof structure of the casting machine oven according to claim 1 or 2, characterized in that, The temperature zone (4) is divided by a partition (9) in the drying tunnel, and the partition (9) has a connecting port in the middle for the steel strip to pass through.

4. The explosion-proof structure of the casting machine oven according to claim 3, characterized in that, A negative pressure air curtain device (10) is provided at the connection port. The negative pressure air curtain device (10) includes a first exhaust section (12) and a second exhaust section (14) arranged opposite to each other. A channel space for the steel belt to pass through is formed between the first exhaust section and the second exhaust section.

5. The explosion-proof structure of the casting machine oven according to claim 3, characterized in that, The top of the casting machine oven is equipped with an exhaust vent and an air inlet.

Images