Automatic fire prevention system for hot forming line press

Abstract

The utility model relates to an automatic fire prevention system for a thermal forming line press, which comprises a hydraulic press, a flame recognition camera, a power supply circuit and a PLC (programmable logic controller), the flame recognition camera is arranged at an outlet of the hydraulic press and used for detecting images when a material part leaves the hydraulic press, and the hydraulic press comprises an oil pump motor. The power supply circuit supplies power to the oil pump motor, an emergency switch is arranged between the power supply circuit and the oil pump motor, the flame recognition camera outputs a detection signal indicating whether the material part is on fire or not to the PLC, and the PLC controls the emergency switch to be turned off according to the fire signal. According to the system, whether hydraulic oil leaks or not can be judged by directly recognizing whether a material part is burnt or not, once the flame recognition camera judges that the burning phenomenon exists, a disconnection instruction can be sent to the emergency switch through the PLC, an oil pump motor of the hydraulic press is shut down emergently, fire hazards are avoided, and the fire safety is improved.

Description

An automatic fire prevention system for a thermoforming line press Technical Field

[0001] This utility model relates to the technical field of emergency protection circuit devices, and in particular to an automatic fire prevention system for a thermoforming line press. Background Technology

[0002] The working principle of an automotive body thermoforming line is to heat flat sheet metal to a set temperature, soften it under certain conditions, and then press it into shape using a hydraulic press. After cooling, the desired car body structure is obtained. The hot pressing temperature is above 900℃, which poses a fire hazard.

[0003] Chinese patent CN108704968A discloses a hot stamping process and a hot forming production line. This production line can sequentially perform cold stamping pre-forming, preheating, austenitization, and hot stamping forming on a blank to obtain the product. This involves temperature control of the preheating chamber, main heating chamber, and insulation chamber. However, it does not consider the fire hazard in the event of a sudden hydraulic oil leak.

[0004] Because hydraulic presses and molds have numerous hydraulic oil pipes, pipe aging leading to ruptures, damage to mold ejector pin pipes, and loose pipe joints can all cause hydraulic oil to spray out. When this spray comes into contact with the hot sheet metal, it can ignite a fire that is very difficult to extinguish. Using infrared cameras to detect potential leaks often results in false alarms, as the production temperature of the sheet metal exceeds 900℃, causing unnecessary downtime. Even if the hydraulic oil is replaced with a flame-retardant type, it is difficult to prevent combustion above 500℃, frequently leading to prolonged downtime due to fires and posing a significant fire hazard.

[0005] Therefore, a safety system is needed to avoid the fire hazard caused by hydraulic oil leakage. Summary of the Invention

[0006] The main purpose of this utility model is to provide an automatic fire prevention system for a thermoforming line press, which can determine whether hydraulic oil is leaking by directly identifying whether the material is burning, and can provide emergency control for the oil pump motor of the hydraulic press, thereby solving fire hazards and improving fire safety.

[0007] This utility model achieves the above-mentioned objective through the following technical solution: an automatic fire prevention system for a thermoforming line press, comprising a hydraulic press, a flame detection camera, a power supply line, and a PLC controller. The flame detection camera is located at the outlet of the hydraulic press and is used to detect images of the material leaving the hydraulic press. The hydraulic press includes an oil pump motor. The power supply line provides power to the oil pump motor, and an emergency switch is provided between the two. The flame detection camera outputs a detection signal to the PLC controller indicating whether the material is on fire. The PLC controller controls the emergency switch to shut off based on the fire signal.

[0008] Specifically, the PLC controller is connected to an audible and visual alarm.

[0009] Specifically, the power supply line provides power to the flame recognition camera via an AC / DC power converter.

[0010] Specifically, it also includes a heating furnace, which includes a heating furnace controller, and the PLC controller controls the heating furnace controller to stop in an emergency.

[0011] Furthermore, the power supply line also provides power to the heating furnace controller.

[0012] The beneficial effects of this utility model's technical solution are:

[0013] 1. This system can determine whether hydraulic oil is leaking by directly identifying whether the material is burning. Once the flame detection camera detects a burning phenomenon, the PLC controller can issue a disconnect command to the emergency switch to shut down the oil pump motor of the hydraulic press in an emergency, thus eliminating fire hazards and improving fire safety.

[0014] 2. When the system detects a burning situation on the material, it will sound an alarm with sound and light to remind the factory staff to eliminate the danger in time.

[0015] 3. When the hydraulic press stops, the heating furnace can also be controlled to pause the heating of subsequent materials, thereby avoiding the accumulation of preheated materials caused by the hydraulic press not working, so as to avoid the generation of excess scrap.

[0016] 4. The electrical equipment within the system can be powered through the same power supply line, without the need for a separate DC power source. Attached Figure Description

[0017] Figure 1 is a circuit diagram of the automatic fire prevention system for the thermoforming line press in the embodiment;

[0018] Figure 2 is a control structure diagram of the automatic fire prevention system for the thermoforming line press in the embodiment.

[0019] The numbers in the image represent:

[0020] 1-Hydraulic press; 11-Oil pump motor;

[0021] 2-Flame recognition camera;

[0022] 3-Power supply line, 31-Emergency switch, 32-AC / DC power converter;

[0023] 4-PLC controller;

[0024] 5- Audible and visual alarm;

[0025] 6-Heating furnace, 61-Heating furnace controller. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments.

[0027] Example:

[0028] As shown in Figures 1 and 2, the present invention provides an automatic fire prevention system for a thermoforming line press, comprising a hydraulic press 1, a flame recognition camera 2, a power supply line 3, a PLC controller 4, an audible and visual alarm 5, and a heating furnace 6.

[0029] As shown in Figures 1 and 2, the flame detection camera 2 is located at the outlet of the hydraulic press 1 and is used to detect the image of the material leaving the hydraulic press 1. The hydraulic press 1 includes an oil pump motor 11, and the power supply line 3 provides power to the oil pump motor 11. An emergency switch 31 is provided between the two. The flame detection camera 2 outputs a detection signal to the PLC controller 4 to determine whether the material is on fire. The PLC controller 4 controls the emergency switch 31 to turn off according to the fire signal.

[0030] The flame recognition camera 2, also known as a flame recognition camera or flame monitoring and early warning camera, primarily functions to identify whether an observed object has an open flame. Since combustion is generally caused by leaked hydraulic oil splashing onto hot materials, the flame recognition camera 2 can identify whether the surface of the material is burning when it is removed from the hydraulic press 1, rather than relying on temperature to determine the material's condition. Therefore, this system can directly identify whether the material is burning to determine if there is a hydraulic oil leak. Once the flame recognition camera 2 detects combustion, it can send a disconnect command to the emergency switch 31 via the PLC controller 4, immediately shutting down the oil pump motor 11 of the hydraulic press 1, thus eliminating fire hazards and improving fire safety.

[0031] As shown in Figure 2, the PLC controller 4 is connected to the audible and visual alarm 5.

[0032] This system can automatically pause the process, but manual confirmation is still required to eliminate the hazard before restarting the equipment on the thermoforming line. Therefore, when the system detects combustion on the workpiece, it will trigger an audible and visual alarm to alert factory staff to promptly address the danger.

[0033] As shown in Figure 1, power supply line 3 supplies power to flame recognition camera 2 via AC / DC power converter 32. Power supply line 3 also supplies power to furnace controller 61.

[0034] The electrical equipment within the system can be powered through the same power supply line 3, without the need for a separate DC power source.

[0035] As shown in Figures 1 and 2, the heating furnace 6 includes a heating furnace controller 61, and a PLC controller 4 controls the heating furnace controller 61 to stop in an emergency.

[0036] The principle of thermoforming is to first heat the material into a softer austenite, and then quench it to form a harder martensite. If the austenite material is not hot-pressed in time, it will cool and form martensite, changing the material properties and resulting in new scrap. Leaks in the oil pump motor 11 often take a long time to resolve. Therefore, when the hydraulic press 1 stops, the PLC controller 4 can also control the heating furnace 6 to pause the heating of subsequent materials, thus avoiding the accumulation of preheated materials due to the hydraulic press 1's inability to work, and preventing the generation of excess scrap.

[0037] The working principle of the automatic fire prevention system for the thermoforming line press is as follows: Under normal operating conditions, the workpiece is first preheated in the heating furnace 6. Once the workpiece is heated to the temperature required for thermoforming, it is quickly transferred to the hydraulic press 1. The oil pump motor 11 then carries the thermoforming mold to heat-press the workpiece. If production is normal, the workpiece will only show a certain red-hot state without flames, and the flame recognition camera 2 will not output an abnormal signal. However, if hydraulic oil leaks from the oil pump motor 11 and flows onto the workpiece, the surface of the workpiece will burn when it is removed from the hydraulic press 1. At this time, the flame recognition camera 2 can identify the abnormality of the workpiece. The PLC controller 4 will then output a signal to the emergency switch 31, the heating furnace controller 61, and the audible and visual alarm 5. The emergency switch 31 stops the oil pump motor 11, the heating furnace controller 61 stops the heating in the heating furnace 6, and the audible and visual alarm 5 alerts the personnel in the factory. The system can only resume processing after the personnel in the factory have eliminated the leakage problem in the hydraulic press 1.

[0038] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A hot forming wire press fire automatic prevention system characterized by: The system includes a hydraulic press, a flame detection camera, a power supply line, and a PLC controller. The flame detection camera is located at the outlet of the hydraulic press and is used to detect images of the material leaving the hydraulic press. The hydraulic press includes an oil pump motor. The power supply line provides power to the oil pump motor, and an emergency switch is provided between the two. The flame detection camera outputs a detection signal to the PLC controller to determine whether the material is on fire. The PLC controller controls the emergency switch to shut off based on the fire signal.

2. The hot former line press fire automatic prevention system of claim 1, wherein: The PLC controller is connected to an audible and visual alarm.

3. The automatic fire prevention system for thermoforming line presses according to claim 1, characterized in that: The power supply line provides power to the flame recognition camera via an AC / DC power converter.

4. The automatic fire prevention system for thermoforming line presses according to claim 1, characterized in that: It also includes a heating furnace, which includes a heating furnace controller, and the PLC controller controls the heating furnace controller to stop in an emergency.

5. The automatic fire prevention system for thermoforming line presses according to claim 4, characterized in that: The power supply line also provides power to the heating furnace controller.

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