Tunnel furnace control method and tunnel furnace

Abstract

The present application relates to the technical field of heating equipment, and discloses a tunnel furnace control method and a tunnel furnace. The tunnel furnace control method includes: collecting the real-time temperature of the cavity, if the real-time temperature of the cavity reaches the cavity preheating target, judging whether the real-time temperature of the cavity meets the cavity target temperature, if it does not meet the cavity target temperature, adjusting the first real-time power of the autonomous adjustment furnace section so that the real-time temperature of the cavity meets the cavity target temperature; collecting the first real-time power and the second real-time power of the follow-up adjustment furnace section, if the difference between the first real-time power and the second real-time power does not meet the preset power difference, adjusting the second real-time power based on the preset power difference until the difference between the first real-time power and the second real-time power meets the preset power difference. The method of the present application, by following the adjustment furnace section to follow the autonomous adjustment furnace section to adjust the power, to ensure that the power of each furnace section is similar, can achieve energy saving and extend the service life.

Description

Technical Field

[0001] The present application relates to the technical field of heating equipment, and in particular to a tunnel furnace control method and a tunnel furnace. Background Art

[0002] Tunnel furnace is a tunnel-type mechanical equipment that completes material baking through heat conduction, convection and radiation. Generally, according to different heat sources, there are electric tunnel furnaces, microwave tunnel furnaces, infrared tunnel furnaces, etc. Tunnel furnaces are composed of multiple continuous furnace sections. Due to factors such as the processing accuracy and assembly errors of each furnace section, there will be uneven heating problems in each furnace section. In order to ensure the uniform temperature of each furnace section, the power of each furnace section needs to be controlled in sections, which may lead to a large power difference between the furnace sections, resulting in energy waste, and the service life of the heating elements with higher power will be reduced. Summary of the invention

[0003] To solve the above technical problems, the present application provides the following technical solutions:

[0004] According to a first aspect of the present application, a tunnel furnace control method is provided, wherein the tunnel furnace comprises an autonomous regulating furnace section and a follow-up regulating furnace section, and the method comprises:

[0005] Collecting the real-time temperature of the cavity, judging whether the cavity preheating target is reached according to the real-time temperature of the cavity, and if the cavity preheating target is reached, judging whether the real-time temperature of the cavity meets the cavity target temperature, and if the cavity target temperature is not met, adjusting the first real-time power of the autonomously regulating furnace section so that the real-time temperature of the cavity meets the cavity target temperature;

[0006] Collect the first real-time power and the second real-time power of the follow-adjusted furnace section. If the difference between the first real-time power and the second real-time power does not meet the preset power difference, adjust the second real-time power based on the preset power difference until the difference between the first real-time power and the second real-time power meets the preset power difference.

[0007] Optionally, collecting the real-time temperature of the cavity and judging whether the cavity preheating target is reached according to the real-time temperature of the cavity includes:

[0008] The real-time temperature of the cavity is collected once at a preset time interval;

[0009] If the change value of the cavity real-time temperature collected twice in succession is less than the preset temperature change threshold, or if the cavity real-time temperature collected twice in succession is greater than the cavity target temperature;

[0010] It is determined that the cavity preheating target is achieved.

[0011] Optionally, the adjusting the second real-time power based on a preset power difference includes:

[0012] An adjusted power is obtained according to the difference between the first real-time power and the preset power, and the second real-time power is adjusted to the adjusted power.

[0013] Optionally, the preset power difference is the product of the first real-time power and a preset coefficient;

[0014] The obtaining the adjusted power according to the first real-time power and the preset power difference, and adjusting the second real-time power to the adjusted power comprises:

[0015] If the first real-time power is greater than the second real-time power, a first adjustment power is obtained according to the difference between the first real-time power and the preset power difference, and the follow-up adjustment furnace section increases the power to the first adjustment power; and / or

[0016] If the first real-time power is less than the second real-time power, a second regulated power is obtained according to the sum of the first real-time power and the preset power difference, and the follow-up regulating furnace section reduces the power to the second regulated power.

[0017] Optionally, the method further includes: adjusting the second real-time power based on a preset power difference until a difference between the first real-time power and the second real-time power satisfies the preset power difference, comprising:

[0018] When adjusting the second real-time power, the real-time temperature of the cavity is collected in real time. If the real-time temperature of the cavity does not meet the target temperature of the cavity, the autonomously adjusting furnace section PID adjusts the first real-time power;

[0019] After adjusting the second real-time power to the adjusted power, determine again whether the difference between the first real-time power and the second real-time power meets the preset power difference; if not, adjust the second real-time power again based on the preset power difference until the difference between the first real-time power and the second real-time power meets the preset power difference.

[0020] Optionally, the real-time temperature of the cavity includes a first real-time temperature of the autonomously regulating furnace section and a second real-time temperature of the follow-regulating furnace section;

[0021] After the step of waiting until the difference between the first real-time power and the second real-time power meets the preset power difference, the method further includes:

[0022] It is determined whether the difference between the first real-time temperature and the second real-time temperature satisfies a preset cavity temperature difference; if not, the second real-time power is adjusted based on the preset cavity temperature difference.

[0023] Optionally, adjusting the second real-time power based on the preset cavity temperature difference includes:

[0024] If the first real-time temperature is greater than the second real-time temperature, a third regulating power is obtained according to the difference between the first real-time temperature and the preset cavity temperature, and the follower regulating furnace increases the power to the third regulating power;

[0025] If the first real-time temperature is lower than the second real-time temperature, a fourth regulating power is obtained according to the difference between the first real-time temperature and the preset cavity temperature, and the follower regulating furnace reduces the power to the fourth regulating power.

[0026] Optionally, if the first real-time temperature is greater than the second real-time temperature, obtaining the third adjustment power according to the first real-time temperature and the preset cavity temperature difference includes: obtaining the first adjustment temperature according to the difference between the first real-time temperature and the preset cavity temperature difference, and obtaining the third adjustment power according to the first adjustment temperature; and / or

[0027] If the first real-time temperature is less than the second real-time temperature, obtaining the fourth regulating power according to the first real-time temperature and the preset cavity temperature difference includes: obtaining the second regulating temperature according to the sum of the first real-time temperature and the preset cavity temperature difference, and obtaining the fourth regulating power according to the second regulating temperature.

[0028] Optionally, the method further comprises:

[0029] The material output temperature of the tunnel furnace is collected, and if the difference between the material output temperature and the material target temperature does not meet the preset material temperature difference, the cavity target temperature is adjusted based on the difference.

[0030] Optionally, the step of adjusting the target temperature of the cavity includes:

[0031] The cavity compensation temperature is determined according to the difference and a preset compensation coefficient, and the cavity target temperature is reset based on the cavity compensation temperature.

[0032] Optionally, before the step of collecting the real-time temperature of the cavity, the step further includes:

[0033] A target power is set, and the autonomous adjustment furnace section and the follow-up adjustment furnace section are preheated based on the target power.

[0034] According to a second aspect of the present application, a tunnel furnace is provided, the tunnel furnace being used to perform any of the above methods, the tunnel furnace comprising:

[0035] At least one self-regulating furnace section;

[0036] At least one follow-up regulating furnace section, wherein the at least one follow-up regulating furnace section is connected to the at least one autonomous regulating furnace section.

[0037] Optionally, each of the autonomous regulating furnace sections and each of the follow-regulating furnace sections respectively include a temperature sensor, a temperature regulator, a power collector, a power regulator and a heating element, the temperature regulator is respectively electrically connected to the temperature sensor, the power collector and the power regulator, and the power regulator is also electrically connected to the heating element.

[0038] Optionally, it further comprises a material temperature sensor and a controller, wherein the material temperature sensor is arranged at the outlet of the tunnel furnace, and the controller is electrically connected to the material temperature sensor, the temperature regulator and the power collector respectively.

[0039] Optionally, the at least one autonomous regulating furnace section is arranged in sequence and at intervals, and the at least one follower regulating furnace section is arranged in sequence and at intervals;

[0040] The two ends of each autonomous regulating furnace section are respectively connected to the corresponding two follower regulating furnace sections, and / or the two ends of each follower regulating furnace section are respectively connected to the corresponding two autonomous regulating furnace sections.

[0041] Optionally, the sum of the number of the at least one autonomous regulating furnace section and the number of the at least one follow-regulating furnace section is an odd number.

[0042] The beneficial effect of the embodiment of the present application is as follows: Different from the prior art, the embodiment of the present application provides a tunnel furnace control method, the tunnel furnace includes an autonomous adjustment furnace section and a follow-up adjustment furnace section, and the tunnel furnace control method is as follows: collecting the real-time temperature of the cavity, judging whether the cavity preheating target is reached according to the real-time temperature of the cavity, if the cavity preheating target is reached, continuing to judge whether the real-time temperature of the cavity meets the cavity target temperature, if not, adjusting the first real-time power of the autonomous adjustment furnace section so that the real-time temperature of the cavity meets the cavity target temperature; collecting the first real-time power and the second real-time power of the follow-up adjustment furnace section, if the difference between the first real-time power and the second real-time power does not meet the preset power difference, adjusting the second real-time power based on the preset power difference until the difference between the first real-time power and the second real-time power meets the preset power difference. In the method of the present application, when the autonomous adjustment furnace section and the follow-up adjustment furnace section reach the preheating target, the follow-up adjustment furnace section is started to perform follow-up adjustment to ensure that the power of the autonomous adjustment furnace section and the follow-up adjustment furnace section is close, thereby achieving energy saving and extending the service life of the heating element. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0044] Figure 1 It is a hardware system block diagram of the tunnel furnace provided in the embodiment of the present application;

[0045] Figure 2 It is a flow chart of a tunnel furnace control method provided in an embodiment of the present application;

[0046] Figure 3 It is a schematic diagram of a process for determining whether the cavity preheating target is reached according to the real-time cavity temperature provided in an embodiment of the present application;

[0047] Figure 4 It is a schematic diagram of an implementation process of obtaining an adjusted power according to a difference between a first real-time power and a preset power, and adjusting the second real-time power to the adjusted power, provided in an embodiment of the present application;

[0048] Figure 5 It is a schematic diagram of an implementation flow of adjusting the second real-time power based on the preset power difference provided by the implementation of the present application until the difference between the first real-time power and the second real-time power meets the preset power difference;

[0049] Figure 6 It is a schematic diagram of the implementation process of adjusting the second real-time power based on the preset cavity temperature difference provided in an embodiment of the present application;

[0050] Figure 7 It is a schematic diagram of a flow chart of a follow-up adjustment of a follow-up adjustment furnace section provided in an embodiment of the present application;

[0051] Figure 8 It is a structural diagram of the control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0054] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0055] See also Figure 1, is a hardware system block diagram of the tunnel furnace provided in the embodiment of the present application. The tunnel furnace is a continuous tunnel furnace, including at least one autonomous adjustment furnace section and at least one follower adjustment furnace section, and at least one follower adjustment furnace section is connected to at least one autonomous adjustment furnace section. In the embodiment of the present application, the tunnel furnace is provided with two adjustment types, autonomous adjustment and follower adjustment. Autonomous temperature control is performed through the autonomous adjustment furnace section, and temperature follower adjustment is performed through the follower adjustment furnace section, so as to achieve power and temperature balance of each furnace section.

[0056] Specifically, at least one end of the follow-up adjustment furnace section is connected to the autonomous adjustment furnace section, and the autonomous adjustment furnace section can be connected to the follow-up adjustment furnace section or the autonomous adjustment furnace section at will. For example, assuming that a tunnel furnace includes 5 furnace sections, the autonomous adjustment furnace section is represented by A, and the follow-up adjustment furnace section is represented by B, then the setting method of the autonomous adjustment furnace section and the follow-up adjustment furnace section in the tunnel furnace can be any one of: ABABA, BABAB, AABAA, AABBA, AABAB, etc.

[0057] In one embodiment, the autonomous regulating furnace sections and the follower regulating furnace sections are arranged alternately, that is, each autonomous regulating furnace section is arranged in sequence at intervals, and each follower regulating furnace section is also arranged in sequence at intervals, and the two ends of each autonomous regulating furnace section are respectively connected to the corresponding two follower regulating furnace sections, and / or, the two ends of each follower regulating furnace section are respectively connected to the corresponding two autonomous regulating furnace sections. For example, assuming that a tunnel furnace includes 5 furnace sections, the autonomous regulating furnace section is represented as A, and the follower regulating furnace section is represented as B, then the setting method of the autonomous regulating furnace section and the follower regulating furnace section in the tunnel furnace can be: ABABA, BABAB setting method. This setting method isolates any two autonomous regulating furnace sections, and minimizes the confusion of the temperature control closed loop caused by the simultaneous autonomous adjustment of adjacent furnace sections.

[0058] In one embodiment, the furnace section located at the entrance or exit side of the tunnel furnace is easily affected by the external environment. In order to improve the overall energy efficiency of the tunnel furnace, the furnace section located at the entrance or exit side of the tunnel furnace is set as an autonomously regulating furnace section, so that the autonomously regulating furnace section can quickly reduce the impact of the external environment on the temperature inside the furnace through autonomous regulation. Specifically, the sum of the number of autonomously regulating furnace sections and follow-up regulating furnace sections in the tunnel furnace is an odd number, and autonomously regulating furnace sections are respectively set at both ends of the tunnel furnace. Figure 1 As shown in the example, furnace section 1 and furnace section 3 are autonomous regulating furnace sections, and furnace section 2 is a follower regulating furnace section.

[0059] Each autonomous regulating furnace section and each follower regulating furnace section respectively include a temperature sensor, a temperature regulator, a power collector, a power regulator and a heating element. Among them, the temperature sensor and the heating element are arranged inside the autonomous regulating furnace section or the follower regulating furnace section, and the temperature regulator, the power collector and the power regulator are arranged outside the autonomous regulating furnace section or the follower regulating furnace section. The temperature regulator is electrically connected to the temperature sensor and the power regulator respectively, and the power regulator is also electrically connected to the heating element. Specifically, the temperature sensor can be a thermocouple, a thermistor, an infrared temperature sensor, a spectroscopic pyrometer, etc. The temperature regulator can be a thermostat. The power collector can be a combination sensor of voltage and current. The power regulator can be an IGBT (Insulate-Gate Bipolar Transistor), a thyristor, etc.

[0060] In one embodiment, the tunnel furnace further includes a controller, which is electrically connected to the temperature regulator and the power collector, respectively. The controller obtains the real-time cavity temperature of the autonomously regulated furnace section or the follower regulated furnace section through the temperature regulator, obtains the real-time power of the autonomously regulated furnace section or the follower regulated furnace section through the power collector, and realizes the temperature control of the tunnel furnace based on the real-time cavity temperature of the autonomously regulated furnace section or the follower regulated furnace section and the real-time power of the autonomously regulated furnace section or the follower regulated furnace section. Specifically, the controller is a programmable controller (such as a single-chip microcomputer or a PLC CPU) equipped with a certain floating-point computing power.

[0061] In other embodiments, the tunnel furnace may not include a controller, but the temperature control of the tunnel furnace is realized by a temperature regulator. In this case, the temperature regulator is a PLC (Programmable Logic Controller) with a temperature control algorithm programmed therein. In this embodiment, the temperature regulator is also electrically connected to the power collector, and the temperature regulator of the follow-regulating furnace section is also electrically connected to the temperature regulator of the autonomous regulating furnace section to obtain the real-time cavity temperature and real-time power of the autonomous regulating furnace section.

[0062] In one embodiment, the tunnel furnace also includes a material temperature sensor arranged at the exit of the tunnel furnace, which is electrically connected to the controller or the temperature regulator and is used to collect the material output temperature of the tunnel furnace and transmit the material output temperature to the controller or the temperature regulator, so that the controller or the temperature regulator adjusts the target temperature of the cavity according to the material output temperature.

[0063] The tunnel furnace provided in the embodiment of the present application can execute the tunnel furnace control method described in any embodiment of the present application. Specifically, the tunnel furnace control method can be executed by a controller and a temperature regulator contained in the tunnel furnace. Among them, the controller or the temperature regulator includes at least one processor and a memory. The memory, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer executable programs and modules. The processor executes the tunnel furnace control method described in any embodiment of the present application by running or executing the software program and / or module stored in the memory, and calling the data stored in the memory.

[0064] See also Figure 2 , is a flow chart of a tunnel furnace control method provided in an embodiment of the present application. The tunnel furnace includes an autonomously regulating furnace section and a follow-up regulating furnace section. In some embodiments, the tunnel furnace here can be controlled by Figure 1 The structural implementation shown and the specific implementation process have been described in detail in the above embodiments and will not be repeated here.

[0065] like Figure 2 As shown, the tunnel furnace control method includes:

[0066] Step S201, collect the real-time temperature of the cavity, and determine whether the cavity preheating target is reached based on the real-time temperature of the cavity. If the cavity preheating target is reached, determine whether the real-time temperature of the cavity meets the cavity target temperature. If it does not meet the cavity target temperature, adjust the first real-time power of the autonomously regulating furnace section so that the real-time temperature of the cavity meets the cavity target temperature.

[0067] Specifically, after the autonomous adjustment furnace section and the follow-up adjustment furnace section are turned on, the target power and cavity target temperature are set first, and the autonomous adjustment furnace section and the follow-up adjustment furnace section are preheated based on the set target power. During the preheating process, the real-time cavity temperature is collected, and it is determined whether the cavity preheating target is reached based on the real-time cavity temperature. The implementation method is as follows: Figure 3 As shown, the specific steps include:

[0068] Step S301, collecting the real-time temperature of the cavity once at a preset time interval.

[0069] Step S302: If the change value of the cavity real-time temperature collected twice in succession is less than the preset temperature change threshold, or if the cavity real-time temperature collected twice in succession is greater than the cavity target temperature, it is determined that the cavity real-time temperature reaches the cavity preheating target.

[0070] The cavity target temperature may be a temperature value or a temperature range, which is not limited herein.

[0071] In one embodiment, the real-time temperature of the cavity includes a first real-time temperature of the autonomously regulating furnace section and a second real-time temperature of the follow-regulating furnace section. The autonomously regulating furnace section and the follow-regulating furnace section are interconnected. When the autonomously regulating furnace section and the follow-regulating furnace section are preheated and heated based on the same target power, the first real-time temperature may be different from the second real-time temperature due to various factors. Specifically, it can be set to judge whether the cavity preheating target is reached based on the higher temperature of the first real-time temperature and the second real-time temperature, that is, if the temperature change value of the higher temperature of the first real-time temperature and the second real-time temperature is less than the preset temperature change threshold value for two consecutive times, or if the higher temperature of the first real-time temperature and the second real-time temperature is greater than the cavity target temperature for two consecutive times, it is judged that the cavity preheating target is reached to prevent the risk of overheating of some furnace sections.

[0072] It is understandable that in some other embodiments, it can also be set to judge whether the cavity preheating target is reached based on one of the first real-time temperature or the second real-time temperature. For example, if the temperature change value of the first real-time temperature collected twice in a row is less than the preset temperature change threshold or the first real-time temperature collected twice in a row is greater than the cavity target temperature, or if the second temperature change value of the real-time temperature collected twice in a row is less than the preset temperature change threshold or the second real-time temperature collected twice in a row is greater than the cavity target temperature, then it is judged that the cavity real-time temperature reaches the cavity preheating target. In some embodiments, it can also be set to judge based on both the first real-time temperature and the second real-time temperature. For example, if the temperature change values ​​of the first real-time temperature and the second real-time temperature collected twice in a row are both less than the preset temperature change threshold, or if the first real-time temperature and the second real-time temperature collected twice in a row are greater than the cavity target temperature, then it is judged that the cavity real-time temperature reaches the cavity preheating target.

[0073] When the cavity preheating target is reached, the self-regulating furnace section performs power adjustment so that the cavity real-time temperature meets the cavity target temperature. Specifically, it is determined whether the cavity real-time temperature meets the cavity target temperature. If it does not meet the cavity target temperature, the first real-time power of the self-regulating furnace section is adjusted so that the cavity real-time temperature meets the cavity target temperature. The self-regulating furnace section uses PID (Proportional Integral Derivative) adjustment to adjust the first real-time power, and can also use manual adjustment to adjust the first real-time power.

[0074] When the cavity preheating target is reached, if the cavity real-time temperature is greater than the cavity target temperature, the first real-time power of the autonomously regulating furnace section is reduced, thereby reducing the first real-time temperature of the autonomously regulating furnace section so that the cavity real-time temperature meets the cavity target temperature; if the cavity real-time temperature is lower than the cavity target temperature, the first real-time power of the autonomously regulating furnace section is increased, thereby increasing the first real-time temperature of the autonomously regulating furnace section so that the cavity real-time temperature meets the cavity target temperature.

[0075] Step S202, collect the first real-time power and the second real-time power of the furnace section that follows the adjustment. If the difference between the first real-time power and the second real-time power does not meet the preset power difference, adjust the second real-time power based on the preset power difference until the difference between the first real-time power and the second real-time power meets the preset power difference.

[0076] When the real-time temperature of the cavity reaches the cavity preheating target, the first real-time power of the self-adjusting furnace section and the second real-time power of the follow-adjusting furnace section are collected once at each preset interval, and the first real-time power and the second real-time power are compared. If the difference between the first real-time power and the second real-time power does not meet the preset power difference, the adjustment power is obtained according to the first real-time power and the preset power difference, and the second real-time power is adjusted to the adjustment power. Among them, the preset power difference is the product of the first real-time power and the preset coefficient, and the preset coefficient can be set according to actual needs, for example, the preset coefficient is set to 0.1, 0.2, etc.

[0077] In one embodiment, the adjustment power is obtained according to the difference between the first real-time power and the preset power, and the implementation method of adjusting the second real-time power to the adjustment power is as follows: Figure 4 As shown, the specific steps include:

[0078] Step S401: if the first real-time power is greater than the second real-time power, a first adjustment power is obtained according to the difference between the first real-time power and the preset power difference, and the furnace section is adjusted to increase the power to the first adjustment power.

[0079] Step S402: if the first real-time power is less than the second real-time power, the second adjustment power is obtained according to the sum of the first real-time power and the preset power difference, and the furnace section is adjusted to reduce the power to the second adjustment power.

[0080] For example, the preset power difference is ΔW, the first real-time power is W1, the preset coefficient is K, and the preset power difference ΔW=W1 K; then the first adjustment power can be W1-ΔW, and the second adjustment power can be W1+ΔW. It should be noted that the first adjustment power is not limited to W1-ΔW, and the second adjustment power is not limited to W1+ΔW. The value range of the first adjustment power and the second adjustment power is [W1-ΔW, W1+ΔW].

[0081] In one embodiment, the second real-time power is adjusted based on the preset power difference until the difference between the first real-time power and the second real-time power satisfies the preset power difference. Figure 5 As shown, the specific steps include:

[0082] Step S501, when adjusting the second real-time power, the real-time temperature of the cavity is collected in real time. If the real-time temperature of the cavity does not meet the target temperature of the cavity, the furnace section PID is autonomously adjusted to adjust the first real-time power.

[0083] Step S502, after adjusting the second real-time power to the adjusted power, determine again whether the difference between the first real-time power and the second real-time power meets the preset power difference. If not, adjust the second real-time power again based on the preset power difference until the difference between the first real-time power and the second real-time power meets the preset power difference.

[0084] In the process of following the regulating furnace section to adjust the second real-time power to the regulating power, the real-time temperature of the cavity will change. If the real-time temperature of the cavity does not meet the target temperature of the cavity, the autonomous regulating furnace section will PID adjust the first real-time power so that the real-time temperature of the cavity meets the target temperature of the cavity; that is, in the process of adjusting the second real-time power, the first real-time power will also change, resulting in that after the second real-time power is adjusted to the regulating power, the difference between the first real-time power and the second real-time power may not meet the preset power difference again. Therefore, after the second real-time power is adjusted to the regulating power, it is necessary to judge again whether the difference between the first real-time power and the second real-time power meets the preset power difference. If not, the second real-time power is adjusted again based on the preset power difference until the difference between the first real-time power and the second real-time power meets the preset power difference.

[0085] In one embodiment, when the difference between the first real-time power and the second real-time power meets the preset power difference, the tunnel furnace control method further includes: determining whether the difference between the first real-time temperature and the second real-time temperature meets the preset cavity temperature difference; if not, adjusting the second real-time power based on the preset cavity temperature difference so that the first real-time temperature and the second real-time temperature meet the preset cavity temperature difference.

[0086] When the difference between the first real-time power and the second real-time power meets the preset power difference, the first real-time temperature and the second real-time temperature are collected and compared. If the difference between the first real-time temperature and the second real-time temperature does not meet the preset cavity temperature difference, an adjustment temperature is obtained according to the first real-time temperature and the preset cavity temperature difference, and the second real-time power is adjusted based on the adjustment temperature.

[0087] In one embodiment, a method for adjusting the second real-time power based on a preset cavity temperature difference is as follows: Figure 6 As shown, the specific steps include:

[0088] Step S601, if the first real-time temperature is greater than the second real-time temperature, the first adjustment temperature is obtained according to the difference between the first real-time temperature and the preset cavity temperature difference, and the third adjustment power is calculated according to the first adjustment temperature, and the following adjustment furnace will increase the power to the third adjustment power.

[0089] Step S602, if the first real-time temperature is lower than the second real-time temperature, the second adjustment temperature is obtained according to the sum of the first real-time temperature and the preset cavity temperature difference, the fourth adjustment power is calculated according to the second adjustment temperature, and the follow-up adjustment furnace reduces the power to the fourth adjustment power.

[0090] For example, if the preset cavity temperature difference is ΔT1 and the first real-time temperature is T1, the first adjustment temperature may be T1-ΔT1 and the second adjustment temperature may be T1+ΔT1. It should be noted that the first adjustment temperature is not limited to T1-ΔT1 and the second adjustment temperature is not limited to T1+ΔT1. The range of the first adjustment temperature and the second adjustment temperature is [T1-ΔT1, T1+ΔT1].

[0091] When the difference between the first real-time power and the second real-time power meets the preset power difference, the first real-time temperature and the second real-time temperature are adjusted to meet the preset temperature difference, which further improves the energy saving of the tunnel furnace and can extend the service life of the tunnel furnace.

[0092] See also Figure 7 , Figure 7 It is a schematic diagram of a flow chart of a follow-up adjustment furnace section provided in an embodiment of the present application, including:

[0093] Step S701, collecting the first real-time power of the autonomously regulated furnace section and the second real-time power of the follow-regulated furnace section.

[0094] Step S702, determining whether the difference between the first real-time power and the second real-time power satisfies a preset power difference, if so, proceeding to step S703, if not, proceeding to step S704.

[0095] Step S703, determining whether the difference between the first real-time temperature and the second real-time temperature satisfies a preset cavity temperature difference, if so, ending this round of adjustment, if not, proceeding to step S705.

[0096] Step S704, following the furnace section to adjust the second real-time power based on the preset power difference.

[0097] Step S705, following the furnace section to adjust the second real-time power based on the preset cavity temperature difference.

[0098] Please refer to the above description for the specific method of adjusting the second real-time power of the follow-up adjustment furnace section based on the preset power difference and adjusting the second real-time power based on the preset cavity temperature difference. Figure 7It can be seen that the temperature control of the follow-up adjustment furnace section is preferentially adjusted with power as the target. When the difference between the real-time power of the autonomous adjustment furnace section and the real-time power of the follow-up adjustment furnace section meets the preset power difference, the temperature is adjusted as the target. This adjustment method can make the real-time temperature of the cavity of the follow-up adjustment furnace section and the autonomous adjustment furnace section quickly reach the cavity target temperature and remain stable. The materials in the tunnel continuously exchange heat with the autonomous adjustment furnace section or the follow-up adjustment furnace section, so that the temperature in the autonomous adjustment furnace section or the follow-up adjustment furnace section constantly changes. Therefore, both the autonomous adjustment furnace section and the follow-up adjustment furnace section need to continuously perform corresponding temperature control according to the collected real-time power and the real-time temperature of the cavity, so that the real-time temperature of the cavity reaches the cavity target temperature, and the difference between the real-time power of the autonomous adjustment furnace section and the real-time power of the follow-up adjustment furnace section meets the preset power difference.

[0099] In one embodiment, after step S202, it also includes: collecting the material output temperature of the tunnel furnace, judging whether the difference between the material output temperature and the material target temperature satisfies the preset material temperature difference, and if not, adjusting the cavity target temperature based on the material target temperature.

[0100] Specifically, the cavity compensation temperature is first determined based on the preset compensation coefficient and the difference between the material output temperature and the material target temperature, and then the cavity target temperature is reset based on the cavity compensation temperature. The compensation coefficient can be obtained based on the temperature rise curve under full material load. For example, when the difference between the material output temperature To and the material target temperature Tb does not meet the preset material temperature difference ΔT2, the compensation temperature Tc= (Tb-To) The compensation coefficient C, the new cavity target temperature is the original cavity target temperature plus the compensation temperature Tc. By continuously correcting the cavity target temperature, the cavity target temperature that meets the material heating requirements can be obtained.

[0101] When the material output temperature is greater than the material target temperature, the compensation temperature is a negative value. After the new cavity target temperature is set to the original cavity target temperature plus the negative compensation temperature, the new cavity target temperature is lower than the original cavity target temperature, and the material output temperature can be reduced to meet the preset material temperature difference with the material target temperature; when the material output temperature is lower than the material target temperature, the compensation temperature is a positive value. After the new cavity target temperature is set to the original cavity target temperature plus the positive compensation temperature, the new cavity target temperature is higher than the original cavity target temperature, and the material output temperature can be increased to meet the preset material temperature difference with the material target temperature.

[0102] In one embodiment, before step S201, the method further includes: setting a corresponding autonomous regulating furnace section for each follower regulating furnace section. One autonomous regulating furnace section may correspond to N follower regulating furnace sections, and one follower regulating furnace section may correspond to M autonomous regulating furnace sections. Wherein, N is an integer greater than or equal to 0, and M is an integer greater than 0.

[0103] After setting the corresponding autonomous adjustment furnace section for the follow-up adjustment furnace section, each autonomous adjustment furnace section and each follow-up adjustment furnace section in the tunnel furnace can correspond to different furnace section groups based on the follow-up relationship. Among them, the follow-up adjustment furnace section and the autonomous adjustment furnace section in step S201 and step S202 belong to the same furnace section group. According to the heating arrangement of the tunnel furnace for the material, the cavity target temperature and target power of each furnace section group can be the same or different.

[0104] For example, in a tunnel furnace, the arrangement of the self-regulating furnace section (A) and the follow-up regulating furnace section (B) is A1B1A2, then the follow-up modes and corresponding furnace section groups of A1, B1 and A2 may include the following three situations: (1) B1 follows A1, corresponding to two furnace section groups: A1B1 and A2; (2) B1 follows A2, corresponding to two furnace section groups: A1 and B1A2; (3) B1 follows A1 and A2, corresponding to one furnace section group: A1B1A2. It is understandable that for other arrangements of the self-regulating furnace section and the follow-up regulating furnace section in the tunnel furnace, those skilled in the art may refer to the above description for adjustment according to the needs to obtain the corresponding follow-up mode and furnace section grouping, and this application does not limit it.

[0105] In one embodiment, when a follow-up adjustment furnace section corresponds to multiple autonomous adjustment furnace sections, before the follow-up adjustment furnace section performs follow-up adjustment, the autonomous adjustment furnace section currently being followed is first determined based on the real-time power or real-time temperature of multiple autonomous adjustment furnace sections and the follow-up adjustment furnace section, and then the follow-up adjustment is performed based on the above-mentioned method. For example, in the above-mentioned furnace section grouping A1B1A2, when the first real-time power of A1 and A2 is greater than the second real-time power of B1, the one with the higher first real-time power of A1 and A2 is determined as the autonomous adjustment furnace section currently being followed; when the first real-time power of A1 and A2 is less than the second real-time power of B1, the one with the smaller first real-time power of A1 and A2 is determined as the autonomous adjustment furnace section currently being followed.

[0106] Below Figure 1 The tunnel furnace control method of the present application is described by taking the tunnel furnace structure shown as an example.

[0107] Start furnace section 1, furnace section 2 and furnace section 3, set furnace section 2 to follow furnace section 1 for adjustment (for illustrative purposes only, not limited), and set the target power and cavity target temperature. According to the settings, furnace section 1 and furnace section 2 are the first furnace section grouping, and furnace section 3 is the second furnace section grouping. The second furnace section grouping only contains furnace section 3. After furnace section 3 is preheated based on the set target power to reach the cavity preheating target, it can be autonomously adjusted using the PID adjustment method, which will not be repeated here. The following takes the first furnace section grouping as an example to illustrate the implementation process of the tunnel furnace control method.

[0108] Furnace section 1 and furnace section 2 are preheated based on the set target power. The temperature sensors in furnace section 1 and furnace section 2 collect their own real-time cavity temperatures once at preset intervals, and transmit the real-time cavity temperatures to the controller through their respective temperature regulators. The controller determines whether the real-time cavity temperatures of the first furnace section group have reached the cavity preheating target based on the real-time cavity temperatures collected twice in a row by furnace section 1 and furnace section 2. Specifically, when the real-time cavity temperatures collected twice in a row by furnace section 1 or furnace section 2 are greater than the cavity target temperature or the change value of the real-time cavity temperatures collected twice in a row is less than the preset temperature change threshold, it is determined that the real-time cavity temperature of the first furnace section group has reached the cavity preheating target.

[0109] After the real-time cavity temperature of the first furnace section group reaches the cavity preheating target, the temperature regulator of furnace section 1 performs PID adjustment based on the cavity target temperature so that the real-time cavity temperature meets the cavity target temperature. Furnace section 2 is controlled by the controller to adjust the power and temperature of furnace section 1.

[0110] Specifically, the power collectors in furnace section 1 and furnace section 2 collect their own real-time power once at a preset interval, and the controller makes a judgment based on the real-time power of furnace section 1 and furnace section 2. If |real-time power of furnace section 1-real-time power of furnace section 2|>preset power difference, furnace section 2 is adjusted with power as the target, that is, if the real-time power of furnace section 1>real-time power of furnace section 2, the output power of furnace section 2 is increased, and if the real-time power of furnace section 1<real-time power of furnace section 2, the output power of furnace section 2 is reduced. Please refer to the above description for the specific adjustment method.

[0111] If |real-time power of furnace section 1 - real-time power of furnace section 2|≤preset power difference, furnace section 2 is adjusted with temperature as target, that is, if the real-time temperature of the cavity of furnace section 1> the real-time temperature of the cavity of furnace section 2, the temperature of furnace section 2 is increased; if the real-time temperature of the cavity of furnace section 1< the real-time temperature of the cavity of furnace section 2, the temperature of furnace section 2 is decreased. Please refer to the above description for the specific adjustment method.

[0112] It is understandable that as the material continuously exchanges heat with furnace section 1 and furnace section 2, the temperature in furnace section 1 and furnace section 2 will continue to change. Therefore, furnace section 1 and furnace section 2 also need to continuously control the temperature so that the real-time temperature of the cavity reaches the target temperature of the cavity, and the difference between the real-time power of furnace section 1 and the real-time power of furnace section 2 meets the preset power difference. After the material has been in the tunnel furnace for a preset period of time, it is output from the tunnel furnace outlet. The material temperature sensor set at the tunnel furnace outlet collects the material output temperature, compares the material output temperature with the material target temperature, and if the difference between the two does not meet the preset material temperature difference, the cavity target temperature is adjusted based on the difference to obtain a cavity target temperature that meets the material heating requirements.

[0113] The tunnel furnace control method provided in the present application, on the one hand, realizes closed-loop control based on the material target temperature by collecting the material output temperature of the tunnel furnace and correcting the cavity target temperature based on the material output temperature; on the other hand, the autonomous adjustment furnace section adopts PID adjustment method to realize closed-loop control based on the cavity target temperature, and the follow-up adjustment furnace section adjusts based on the power difference and temperature difference between it and the autonomous adjustment furnace section, which also realizes closed-loop control of the cavity target temperature. Therefore, the tunnel furnace control method of the present application is a double closed-loop tunnel furnace control method, which not only overcomes the temperature control closed-loop confusion problem caused by the use of multi-point segmented control in the prior art, but also the temperature control can maintain absolute stability, and will not cause the material to not heat up or even release heat due to temperature imbalance, thereby improving energy utilization efficiency.

[0114] According to an embodiment of the present application, a control device is provided, such as Figure 8 , is a schematic diagram of the structure of a control device provided in an embodiment of the present application, the control device may include a processor 801, a communication interface 802, a memory 803 and a communication bus 804, wherein the processor 801, the communication interface 802, and the memory 803 communicate with each other through the communication bus 804. The processor 801 may call the logic instructions in the memory 803 to execute the above-mentioned tunnel furnace control method.

[0115] In addition, the logic instructions in the above-mentioned memory 803 can be implemented in the form of software functional units and can be stored in several computer-readable storage media when sold or used as independent products. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product in essence or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the tunnel furnace control method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0116] In one embodiment, the control device may be a programmable controller (such as a single-chip microcomputer or a PLC CPU) equipped with a certain floating-point computing power.

[0117] According to an embodiment of the present application, a computer-readable storage medium is provided, the type of which is as described above, and the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor executes the steps of the tunnel furnace control method described above.

[0118] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution, in essence or in other words, the part that contributes to the relevant technology, can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0119] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. Therefore, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tunnel furnace control method, characterized in that: The tunnel furnace includes an autonomous regulating furnace section and a follow-up regulating furnace section, and the method includes: Collecting the real-time temperature of the cavity, judging whether the cavity preheating target is reached according to the real-time temperature of the cavity, and if the cavity preheating target is reached, judging whether the real-time temperature of the cavity meets the cavity target temperature, and if the cavity target temperature is not met, adjusting the first real-time power of the autonomously regulating furnace section so that the real-time temperature of the cavity meets the cavity target temperature; Collect the first real-time power and the second real-time power of the follow-adjusted furnace section. If the difference between the first real-time power and the second real-time power does not meet the preset power difference, adjust the second real-time power based on the preset power difference until the difference between the first real-time power and the second real-time power meets the preset power difference.

2. The method according to claim 1, characterized in that The collecting the real-time temperature of the cavity and judging whether the cavity preheating target is reached according to the real-time temperature of the cavity include: The real-time temperature of the cavity is collected once at a preset time interval; If the change value of the cavity real-time temperature collected twice in succession is less than the preset temperature change threshold, or if the cavity real-time temperature collected twice in succession is greater than the cavity target temperature; It is determined that the cavity preheating target is achieved.

3. The method according to claim 1, characterized in that The adjusting the second real-time power based on the preset power difference comprises: An adjusted power is obtained according to the difference between the first real-time power and the preset power, and the second real-time power is adjusted to the adjusted power.

4. The method according to claim 3, characterized in that The preset power difference is the product of the first real-time power and a preset coefficient; The obtaining the adjusted power according to the first real-time power and the preset power difference, and adjusting the second real-time power to the adjusted power comprises: If the first real-time power is greater than the second real-time power, a first adjustment power is obtained according to the difference between the first real-time power and the preset power difference, and the follow-up adjustment furnace section increases the power to the first adjustment power; and / or If the first real-time power is less than the second real-time power, a second regulated power is obtained according to the sum of the first real-time power and the preset power difference, and the follow-up regulating furnace section reduces the power to the second regulated power.

5. The method according to claim 3, characterized in that: Also includes: The adjusting the second real-time power based on the preset power difference until the difference between the first real-time power and the second real-time power satisfies the preset power difference includes: When adjusting the second real-time power, the real-time temperature of the cavity is collected in real time. If the real-time temperature of the cavity does not meet the target temperature of the cavity, the autonomously adjusting furnace section PID adjusts the first real-time power; After adjusting the second real-time power to the adjusted power, determine again whether the difference between the first real-time power and the second real-time power meets the preset power difference; if not, adjust the second real-time power again based on the preset power difference until the difference between the first real-time power and the second real-time power meets the preset power difference.

6. The method according to claim 1, characterized in that The real-time temperature of the cavity includes the first real-time temperature of the autonomously regulating furnace section and the second real-time temperature of the follow-up regulating furnace section; After the step of waiting until the difference between the first real-time power and the second real-time power meets the preset power difference, the method further includes: It is determined whether the difference between the first real-time temperature and the second real-time temperature satisfies a preset cavity temperature difference; if not, the second real-time power is adjusted based on the preset cavity temperature difference.

7. The method according to claim 6, characterized in that The adjusting the second real-time power based on the preset cavity temperature difference comprises: If the first real-time temperature is greater than the second real-time temperature, a third regulating power is obtained according to the difference between the first real-time temperature and the preset cavity temperature, and the follower regulating furnace increases the power to the third regulating power; If the first real-time temperature is lower than the second real-time temperature, a fourth regulating power is obtained according to the difference between the first real-time temperature and the preset cavity temperature, and the follower regulating furnace reduces the power to the fourth regulating power.

8. The method according to claim 7, characterized in that If the first real-time temperature is greater than the second real-time temperature, obtaining the third regulating power according to the first real-time temperature and the preset cavity temperature difference includes: obtaining the first regulating temperature according to the difference between the first real-time temperature and the preset cavity temperature difference, and obtaining the third regulating power according to the first regulating temperature; and / or If the first real-time temperature is less than the second real-time temperature, obtaining the fourth regulating power according to the first real-time temperature and the preset cavity temperature difference includes: obtaining the second regulating temperature according to the sum of the first real-time temperature and the preset cavity temperature difference, and obtaining the fourth regulating power according to the second regulating temperature.

9. The method according to any one of claims 1 to 8, characterized in that: The method further comprises: The material output temperature of the tunnel furnace is collected, and if the difference between the material output temperature and the material target temperature does not meet the preset material temperature difference, the cavity target temperature is adjusted based on the difference.

10. The method according to claim 9, characterized in that The step of adjusting the target temperature of the cavity comprises: The cavity compensation temperature is determined according to the difference and a preset compensation coefficient, and the cavity target temperature is reset based on the cavity compensation temperature.

11. The method according to any one of claims 1 to 8, characterized in that: Before the step of collecting the real-time temperature of the cavity, the following steps are also included: A target power is set, and the autonomous adjustment furnace section and the follow-up adjustment furnace section are preheated based on the target power.

12. A tunnel furnace, characterized in that: The tunnel furnace is used to perform the method according to any one of claims 1 to 11, and the tunnel furnace comprises: At least one self-regulating furnace section; At least one follow-up regulating furnace section, wherein the at least one follow-up regulating furnace section is connected to the at least one autonomous regulating furnace section.

13. The tunnel furnace according to claim 12, characterized in that: Each of the autonomous regulating furnace sections and each of the follow regulating furnace sections respectively include a temperature sensor, a temperature regulator, a power collector, a power regulator and a heating element. The temperature regulator is respectively electrically connected to the temperature sensor, the power collector and the power regulator, and the power regulator is also electrically connected to the heating element.

14. The tunnel furnace according to claim 13, characterized in that: It also includes a material temperature sensor and a controller. The material temperature sensor is arranged at the outlet of the tunnel furnace, and the controller is electrically connected to the material temperature sensor, the temperature regulator and the power collector respectively.

15. The tunnel furnace according to claim 12, characterized in that: The at least one autonomous regulating furnace section is arranged in sequence and at intervals, and the at least one follower regulating furnace section is arranged in sequence and at intervals; The two ends of each autonomous regulating furnace section are respectively connected to the corresponding two follower regulating furnace sections, and / or the two ends of each follower regulating furnace section are respectively connected to the corresponding two autonomous regulating furnace sections.

16. The tunnel furnace according to claim 12, characterized in that: The sum of the number of the at least one autonomous regulating furnace section and the number of the at least one follow-regulating furnace section is an odd number.

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