A control method and control system for an anti-dry burning oven and an anti-dry burning oven

Abstract

The present invention discloses a control method, a control system and an anti-dry burning oven. The control method includes: the main control system sets a temperature threshold, and monitors the temperature of the heating component through a first sensor to heat the oven; the main control system sends a monitoring signal to the protection system to determine whether the temperature threshold is reached, and if reached, the temperature is maintained constant. The protection system monitors the temperature inside the oven through a second sensor, and feeds back to the main control system for comparison. The protection system controls the warning device according to the judgment result and performs power-off protection. The method monitors the temperature of the heating component and the inside of the oven respectively, and determines the temperature inside the oven according to the first temperature signal and the second temperature signal, and can also determine whether the first sensor is damaged. It can not only effectively avoid the phenomenon of dry burning, ensure the processing needs of polyurethane and raw materials, but also promptly repair and replace the temperature sensor to prevent the oven from being damaged by overheating.

Description

Technical Field

[0001] The present invention relates to the technical field of ovens, and in particular to a control method and a control system for an anti-dry-burning oven and an anti-dry-burning oven. Background Art

[0002] In the process of producing polyurethane sealing components, an oven is often needed to heat-melt or dry the polyurethane raw materials. Since the polyurethane needs to be heated for a long time at a certain temperature during the hot drying process, overheating will cause the water molecule content in the polyurethane liquid to decrease, resulting in dry burning and damaging the performance of the polyurethane material. At present, the oven needs to work for 10-12 hours in winter, so it is very necessary to monitor the temperature inside the oven. The existing oven temperature control monitoring is to protect the oven by setting the temperature threshold and monitor it through the temperature sensor, but there are still the following problems: the temperature of the heating device and the inside of the oven is uneven, and there is a certain temperature difference, resulting in inaccurate temperature monitoring, and it is easy for the temperature of the heating device to be too high when the oven reaches the set temperature, resulting in overheating and damage to the wiring of the temperature sensor, which in turn leads to the problem of temperature monitoring failure. During the long-term operation of the oven, workers cannot observe it all the time, causing equipment damage, energy waste and even safety accidents. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a control method and control system for an anti-dry-burning oven and an anti-dry-burning oven.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: a method for controlling an anti-dry burning oven, comprising:

[0005] S1: The main control system sets a temperature threshold, monitors the temperature of the heating component through a first sensor, and feeds back a first temperature signal to the main control system for heating;

[0006] S2: the main control system sends a monitoring signal to the protection system, and monitors whether the first temperature signal reaches the temperature threshold. If not, the process returns to step S1; if reached, the temperature is kept constant. The protection system monitors the temperature inside the oven through the second sensor, and feeds back the second temperature signal to the main control system.

[0007] S3: The main control system receives the first temperature signal and the second temperature signal, compares them, and sends the judgment result to the protection system. If the second temperature signal is less than or equal to the first temperature signal, it is judged that the temperature of the main control system is normal, and returns to step S2 to maintain a constant temperature state.

[0008] S4: The protection system determines the temperature of the heating component and the inside of the oven. If the second temperature signal is greater than the first temperature signal, an alarm signal is sent to the warning device and power-off protection is performed.

[0009] As a further description of the above technical solution: in the step S2, it also includes:

[0010] S21: the main control system compares the received first temperature signal with a set temperature threshold. If the first temperature signal reaches the temperature threshold, the main control system controls the heating component to maintain the temperature threshold so that the temperature inside the oven continues to rise;

[0011] S22: The protection system sets an interval time and sends the monitored second temperature signal to the main control system, so that the main control system compares the first temperature signal with the second temperature signal.

[0012] As a further description of the above technical solution: in the step S3, it also includes:

[0013] S31: The main control system makes a judgment based on the received first temperature signal and the second temperature signal. If the first temperature signal is greater than the second temperature signal, it is judged that the temperature inside the oven is lower than the temperature of the heating component. If the first temperature signal is equal to the second temperature signal, it means that the temperature inside the oven is equal to the temperature of the heating component, and drying is performed, and the monitoring results are sent to the protection system.

[0014] As a further description of the above technical solution: in the step S4, it also includes:

[0015] S41: When the second temperature signal is greater than the first temperature signal, it is determined that the first sensor is damaged, and the protection system sends a power-off signal to the main control system, and the main control system controls the heating component to power off and stop running.

[0016] As a further description of the above technical solution: the protection system sets an interval time, controls the second sensor to monitor the temperature in the oven, and sends it to the main control system, and the main control system saves and backs up the second temperature signal.

[0017] As a further description of the above technical solution: the main control system controls the operation of the fan on one side of the heating component. When the temperature of the heating component reaches a temperature threshold, the fan is controlled to operate to increase the temperature inside the oven.

[0018] As a further description of the above technical solution: when the main control system controls the power-off protection of the heating component, the fan continues to run until the second temperature signal is monitored as normal temperature, and the fan is powered off and runs.

[0019] Also included is an anti-dry burning oven control system, which is applicable to any control method in the above technical solution, including:

[0020] Monitoring module: collects and monitors the temperature of the oven and heating components and generates corresponding temperature signals;

[0021] Timing module: controls the monitoring module to monitor the temperature inside the oven according to the set time;

[0022] Main control module: sets the temperature threshold of the heating component, receives the temperature signal sent by the monitoring module, compares and determines whether the temperature inside the oven exceeds the temperature threshold, and monitors according to the time interval set by the timing module.

[0023] Also included is an anti-dry burning oven, which is applicable to any control method and system in the above technical solutions, including:

[0024] Oven;

[0025] The inner side of the oven is divided into two upper and lower cavities by a partition. A heating component is provided in the upper cavity. A first sensor is provided on one side of the heating component to monitor the temperature of the heating component. A second sensor is provided in the lower cavity to monitor the temperature inside the oven.

[0026] As a further description of the above technical solution: a control box and a fan are arranged on the outside of the oven, the control box is electrically connected to the first sensor and the second sensor, and the output end of the fan is connected to the heating assembly.

[0027] The above technical solution has the following advantages or beneficial effects:

[0028] 1. By setting two temperature sensors inside the oven, the temperature of the heating component and the temperature inside the oven are monitored respectively. While judging the temperature inside the oven according to the first temperature signal and the second temperature signal, it is also possible to judge whether the first sensor is damaged. This can not only effectively avoid the phenomenon of dry burning and ensure the processing needs of polyurethane and raw materials, but also timely repair and replace the temperature sensor to prevent the oven from being damaged by overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The process of the control method proposed by the present invention is Figure 1 ;

[0030] Figure 2 The process of the control method proposed by the present invention is Figure 2 ;

[0031] Figure 3 The process of the control method proposed by the present invention is Figure 3 ;

[0032] Figure 4 The process of the control method proposed by the present invention is Figure 4 ;

[0033] Figure 5 It is a structural schematic diagram of the control system proposed by the present invention;

[0034] Figure 6 is a three-dimensional diagram of the oven in the present invention;

[0035] Figure 7 It is a structural schematic diagram of the oven in the present invention.

[0036] Legend:

[0037] 1. Monitoring module; 2. Timing module; 3. Main control module; 4. Oven; 5. Heating component; 6. First sensor; 7. Second sensor; 8. Control box; 9. Fan. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Reference Figure 1 , an embodiment of the present invention provides: a method for controlling an anti-dry burning oven, comprising:

[0040] S1: The main control system sets a temperature threshold, monitors the temperature of the heating component through a first sensor, and feeds back a first temperature signal to the main control system for heating;

[0041] S2: The main control system sends a monitoring signal to the protection system, and monitors whether the first temperature signal reaches the temperature threshold. If not, it returns to step S1. If it reaches, it maintains a constant temperature. The protection system monitors the temperature inside the oven through the second sensor and feeds back the second temperature signal to the main control system.

[0042] S3: The main control system receives the first temperature signal and the second temperature signal, compares them, and sends the judgment result to the protection system. If the second temperature signal is less than or equal to the first temperature signal, it is judged that the temperature of the main control system is normal, and returns to step S2 to maintain a constant temperature state.

[0043] S4: The protection system determines the temperature of the heating component and the inside of the oven. If the second temperature signal is greater than the first temperature signal, an alarm signal is sent to the warning device and power-off protection is performed.

[0044] In this embodiment, the main control system is connected to the first sensor, and the protection system is connected to the second sensor. The temperature at the heating component is monitored by the first sensor, and the temperature inside the oven is monitored by the second sensor. The temperature difference between the heating component and the inside of the oven can be accurately measured, and a judgment is made based on the monitored first temperature signal and the second temperature signal. During the process of heating the inside of the oven, the set temperature of the heating component is monitored by the first sensor. When the first temperature signal is weak and does not reach the set temperature threshold, the temperature continues to rise. If it reaches the set temperature, the heating component can be controlled to maintain a constant temperature. At this time, the temperature inside the oven gradually rises, and the protection system receives the second temperature signal sent by the second sensor and feeds it back to the main control system. By comparing with the main control system, it can be concluded that the temperature difference between the first temperature signal and the second temperature signal gradually decreases until the first temperature signal is approximately equal to the second temperature signal (the temperature difference range is 0.1-2.0℃). At this time, the temperature inside the oven can be maintained within the drying heating temperature range of the polyurethane material to ensure that the performance of the polyurethane material is not affected. If the threshold set by the main control system fails or the first sensor is damaged due to monitoring the heating component, causing the heating component to continue to heat up, the protection system sends the second temperature signal monitored by the second sensor to the main control system for power-off control protection, which can monitor the use status of the first sensor and facilitate timely maintenance and replacement.

[0045] Reference Figure 2 , in step S2, further comprising:

[0046] S21: the main control system compares the received first temperature signal with a set temperature threshold. If the first temperature signal reaches the temperature threshold, the main control system controls the heating component to maintain the temperature threshold so that the temperature inside the oven continues to rise.

[0047] S22: The protection system sets an interval time and sends the monitored second temperature signal to the main control system, so that the main control system compares the first temperature signal with the second temperature signal.

[0048] In this embodiment, the temperature threshold at which the heating component can be heated is set in the main control system. The main control group controls where the heating is performed and monitors the temperature of the heating component through the first sensor until the first sensor monitors that the heating component has risen to the temperature threshold. The heating component is controlled to maintain a constant temperature and perform heat preservation and drying. During the process of heating and heat preservation, the protection system controls the second sensor to monitor the temperature inside the oven and sends the second temperature signal to the main control system for comparison to monitor the temperature difference change.

[0049] Reference Figure 3 , in step S3, further comprising:

[0050] S31: The main control system makes a judgment based on the received first temperature signal and the second temperature signal. If the first temperature signal is greater than the second temperature signal, it is judged that the temperature inside the oven is lower than the temperature of the heating component. If the first temperature signal is equal to the second temperature signal, it means that the temperature inside the oven is equal to the temperature of the heating component. Drying is performed and the monitoring results are sent to the protection system.

[0051] In this embodiment, under normal operating conditions, when the first temperature signal is greater than the second temperature signal, the temperature inside the oven is lower than the temperature of the heating component, and the inside of the oven is in a heating state; if the first temperature signal is equal to the second temperature signal, it means that the temperature inside the oven is equal to the temperature of the heating component, and the oven is in a heat preservation state. Accurate monitoring of the oven state switching can be achieved. During the monitoring process, the protection system and the main control system perform temperature monitoring at the same time, which can effectively reduce temperature errors and improve the accuracy of temperature monitoring.

[0052] Reference Figure 4 , in step S4, further comprising:

[0053] S41: When the second temperature signal is greater than the first temperature signal, it is determined that the first sensor is damaged, and the protection system sends a power-off signal to the main control system, and the main control system controls the heating component to power off and stop running.

[0054] In this embodiment, when dry burning occurs, the temperature inside the oven exceeds the temperature threshold set by the main control system. Most of the reasons are caused by sensor failure. By comparing the signals of the first sensor and the second sensor, when the second temperature signal of the second sensor exceeds the temperature threshold, it can be judged that the temperature inside the oven is high and dry burning occurs. If the second temperature signal is greater than the first temperature signal, it can be judged that the first sensor has failed and is damaged and needs to be repaired and replaced. At this time, the protection system sends a power-off signal to the main control system to control the heating component to cut off power and stop running. At the same time, the protection system sends an alarm signal to the warning device to remind the operator to perform maintenance.

[0055] The protection system sets an interval time, controls the second sensor to monitor the temperature in the oven, and sends the temperature to the main control system, which saves and backs up the second temperature signal.

[0056] In this embodiment, the protection system sets the interval time to 30-60 minutes, performs temperature monitoring and comparison, and sends the second temperature signal to the main control system for storage, so as to facilitate regular inspection by operators.

[0057] The main control system controls the fan on one side of the heating component to run. When the temperature of the heating component reaches the temperature threshold, the fan is controlled to operate to increase the temperature inside the oven. When the main control system controls the power-off protection of the heating component, the fan continues to run until the second temperature signal is monitored as normal temperature, and the fan is powered off.

[0058] In this embodiment, the fan is controlled to perform heat sealing drying and cooling and heat dissipation. During the heating process, when the heating component reaches the temperature threshold, in order to quickly increase the temperature inside the oven, the fan is used to blow the inside of the oven to circulate the hot air, and the temperature inside the oven rises more evenly. When the operation is ended or the machine is shut down for maintenance, after the heating component is powered off, the fan is used to accelerate the cooling process of the temperature inside the oven.

[0059] Reference Figure 5 The present invention also provides an embodiment of an anti-dry burning oven control system, and the control system is applicable to any control method in the above technical solution, including:

[0060] Monitoring module 1: collects and monitors the temperature of the oven and heating components and generates corresponding temperature signals;

[0061] Timing module 2: controls monitoring module 1 to monitor the temperature inside the oven according to the set time;

[0062] Main control module 3: sets the temperature threshold of the heating component, receives the temperature signal sent by monitoring module 1, compares and determines whether the temperature inside the oven exceeds the temperature threshold, and monitors according to the time interval set by timing module 2.

[0063] In this embodiment, the monitoring module 1 monitors the temperature of the heating component and the inside of the oven through the first sensor and the second sensor, and sends the temperature signal to the main control module 3, so that the main control module 3 compares and determines the operating status of the oven and performs protection. The main control module 3 receives the second temperature signal sent by the second sensor according to the time interval set by the timing module 2. While monitoring the temperature, it also monitors the operating status of the first sensor.

[0064] Reference Figure 6 - Figure 7 , an anti-dry burning oven, the oven is suitable for any control method and system in the above technical solution, including:

[0065] Oven 4;

[0066] The inside of the oven 4 is divided into two upper and lower cavities by a partition. A heating component 5 is provided in the upper cavity. A first sensor 6 is provided on one side of the heating component 5 to monitor the temperature of the heating component 5. A second sensor 7 is provided in the lower cavity to monitor the temperature inside the oven 4.

[0067] A control box 8 and a fan 9 are provided outside the oven 4 . The control box 8 is electrically connected to the first sensor 6 and the second sensor 7 . The output end of the fan 9 is connected to the heating assembly 5 .

[0068] In this embodiment, the heating component 5 is a thermocouple or a heating wire, which is arranged in the upper cavity and connected to the fan 9. It is connected to the lower cavity on both sides of the upper cavity to realize hot air circulation. The first sensor 6 is arranged in the upper cavity to monitor the temperature of the heating component 5. The second sensor 7 is arranged in the lower cavity to monitor the inside of the oven 4. The warning device is a buzzer or an indicator light, which is arranged on the outside of the oven 4. The control system proposed in the present invention is integrated inside the control box 8 and controlled by an MCU processor or a PLC.

[0069] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling an oven to prevent dry burning, characterized in that: include: S1: The main control system sets a temperature threshold, monitors the temperature of the heating component through a first sensor, and feeds back a first temperature signal to the main control system for heating; S2: the main control system sends a monitoring signal to the protection system, and monitors whether the first temperature signal reaches the temperature threshold. If not, the process returns to step S1; if reached, the temperature is kept constant. The protection system monitors the temperature inside the oven through the second sensor, and feeds back the second temperature signal to the main control system. S3: The main control system receives the first temperature signal and the second temperature signal, compares them, and sends the judgment result to the protection system. If the second temperature signal is less than or equal to the first temperature signal, it is judged that the temperature of the main control system is normal, and returns to step S2 to maintain a constant temperature state. S4: the protection system determines the temperature of the heating component and the inner side of the oven, and if the second temperature signal is greater than the first temperature signal, sends an alarm signal to the warning device and performs power-off protection; In the step S2, it also includes: S21: the main control system compares the received first temperature signal with a set temperature threshold. If the first temperature signal reaches the temperature threshold, the main control system controls the heating component to maintain the temperature threshold so that the temperature inside the oven continues to rise; S22: the protection system sets an interval time and sends the monitored second temperature signal to the main control system, so that the main control system compares the first temperature signal with the second temperature signal; In the step S3, it also includes: S31: The main control system makes a judgment based on the received first temperature signal and the second temperature signal. If the first temperature signal is greater than the second temperature signal, it is judged that the temperature inside the oven is less than the temperature of the heating component. If the first temperature signal is equal to the second temperature signal, it means that the temperature inside the oven is equal to the temperature of the heating component, and the oven is dried, and the monitoring result is sent to the protection system. In the step S4, it also includes: S41: When the second temperature signal is greater than the first temperature signal, it is determined that the first sensor is damaged, and the protection system sends a power-off signal to the main control system, and the main control system controls the heating component to power off and stop running.

2. The control method according to claim 1, characterized in that: The protection system sets an interval time, controls the second sensor to monitor the temperature in the oven, and sends the second temperature signal to the main control system, and the main control system saves and backs up the second temperature signal.

3. The control method according to claim 1, characterized in that: The main control system controls the operation of the fan on one side of the heating component. When the temperature of the heating component reaches a temperature threshold, the main control system controls the fan to operate so that the temperature inside the oven is increased.

4. The control method according to claim 3, characterized in that: When the main control system controls the heating component to be powered off for protection, the fan continues to run until the second temperature signal is monitored to be normal temperature, and the fan is powered off and runs.

5. A dry burning prevention oven control system, characterized in that: The control system is applicable to any one of the control methods in claims 1 to 4 above, including: Monitoring module (1): collects and monitors the temperature of the oven and the heating component and generates corresponding temperature signals; Timing module (2): controlling the monitoring module (1) to monitor the temperature inside the oven according to a set time; Main control module (3): sets a temperature threshold of the heating component, receives the temperature signal sent by the monitoring module (1), performs comparison to determine whether the temperature inside the oven exceeds the temperature threshold, and performs monitoring according to the time interval set by the timing module (2).

6. An anti-dry burning oven, characterized in that: The oven is applicable to the control method of any one of claims 1 to 4 and the anti-dry burning oven control system of claim 5, comprising: Oven (4); The inside of the oven (4) is divided into two upper and lower cavities by a partition. A heating component (5) is provided in the upper cavity. A first sensor (6) is provided on one side of the heating component (5) to monitor the temperature of the heating component (5). A second sensor (7) is provided in the lower cavity to monitor the temperature inside the oven (4).

7. The oven according to claim 6, characterized in that: A control box (8) and a fan (9) are arranged outside the oven (4); the control box (8) is electrically connected to the first sensor (6) and the second sensor (7); and an output end of the fan (9) is connected to the heating assembly (5).

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