Infrared radiation temperature control method for spraying production line
阅读说明：本技术 用于喷涂产线的红外辐射温度控制方法 (Infrared radiation temperature control method for spraying production line ) 是由 王永宏 直耀东 王大恒 于 2021-01-07 设计创作，主要内容包括：本发明揭示了用于喷涂产线的红外辐射温度控制方法,红外辐射炉内设有若干催化加热板,任意催化加热板上设有温度传感器,红外辐射温度控制方法包括如下步骤：模拟温度检测,记录对照温度,微调步骤,同步升温调节步骤,计算各催化加热板的温调系数,催化加热板微调参照选择,温度控制步骤,本发明能实现催化加热板温控相关联,实时温度监控,通过关联系数进行整体温控调节,满足各催化加热板的个体差异和炉腔温度差异调节需求,确保产品受热均匀稳定,提高了产品固化稳定性,产品合格率得到较大提升。具备反射率衰减自适应调节功能,满足炉腔温度稳定均匀,确保达到固化温度稳定,防止出现固化不均匀和固化不完全现象。(The invention discloses an infrared radiation temperature control method for a spraying production line, wherein a plurality of catalytic heating plates are arranged in an infrared radiation furnace, a temperature sensor is arranged on any catalytic heating plate, and the infrared radiation temperature control method comprises the following steps: the method comprises the steps of simulating temperature detection, recording comparison temperature, fine tuning, synchronously heating up and adjusting, calculating temperature adjusting coefficients of all catalytic heating plates, fine tuning reference selection of the catalytic heating plates and temperature control. The device has the reflectivity attenuation self-adaptive adjusting function, meets the requirement of stable and uniform temperature of the furnace chamber, ensures stable curing temperature, and prevents the phenomena of non-uniform curing and incomplete curing.)
1. The infrared radiation temperature control method for the spraying production line is characterized by comprising the following steps:
the spraying production line is provided with at least one infrared radiation furnace, a plurality of catalytic heating plates are arranged in the infrared radiation furnace, a temperature sensor is arranged on any catalytic heating plate,
the infrared radiation temperature control method comprises the following steps:
s1 simulates the detection of the temperature,
arranging a simulation detection source on the center of a furnace chamber of the infrared radiation furnace, arranging simulation detection points which are in direct-injection correspondence with a plurality of catalytic heating plates one by one on the simulation detection source, and controlling the temperature of the catalytic heating plates to enable the temperature of each simulation detection point to reach a required temperature range;
the S2 records the control temperature,
collecting the temperature of each simulation detection point as TJ1～TJN；
The fine-tuning step of S3 is performed,
the catalytic heating plates are finely adjusted one by one to ensure that the temperature difference range of adjacent simulation detection points is +/-5 ℃, and the temperature difference range of the integral simulation detection points is +/-25 ℃, and then the temperature TK of the catalytic heating plates is obtained1～TKN，
S4 is a synchronous temperature-raising adjustment step,
the temperature of the catalytic heating plate is gradually increased and adjusted, so that the temperature of adjacent simulation detection points is synchronously increased by 5-6 ℃, and the temperature TY of the catalytic heating plate is obtained at the moment1～TYN；
S5 calculates a temperature adjustment coefficient of each catalytic heating panel,
δ1＝△T1/△T2～δN-1＝△TN-1/△TNwherein delta is the regulation coefficient of two corresponding catalytic heating plates, delta T1～△TNThe difference between the temperature control values of the catalytic heating plates;
s6 catalytic heater plate fine tuning reference selection,
obtaining at least three reference catalytic heater plates with the smallest absolute value of the fine tuning temperature difference;
a step of controlling the temperature of S7,
in the temperature adjusting process, the temperature adjusting system of other catalytic heating plates is adjusted according to the adjusting temperature of the catalytic heating plate.
2. The infrared radiation temperature control method for the coating production line according to claim 1, wherein:
further comprises an aging resistance fine adjustment step S8,
carrying out aging detection test on the catalytic heating plate for S,collecting temperature changes of the three reference catalytic heating plates and the corresponding simulation detection points, and maintaining the temperature of the three reference catalytic heating plates to be TT1～TT3The temperature difference corresponding to the simulated detection point is delta TS1～△TS3，
In carrying out TT1～TT3The temperature of the simulation test point is raised to the original temperature by temperature rise regulation, and the temperature difference delta TT of the temperature rise regulation is obtained at the moment1～△TT3，
Calculating the attenuation coefficient theta, theta ═ delta TT1+△TT2+△TT3)/(△TS1+△TS2+△TS3)，
In step S7, the accumulated operating time of the reference catalytic heating plate is monitored, the accumulated operating time is SN, and the temperature control is T when the temperature of the reference catalytic heating plate is adjustedAND(1+ θ SN/S), wherein TANDIs the original bit-adjusted value.
Technical Field
The invention relates to an infrared radiation temperature control method, and belongs to the technical field of spray paint curing control methods.
Background
Infrared light is also known as infrared light. In the electromagnetic spectrum, electromagnetic radiation having wavelengths between red and microwave. Outside the visible range, wavelengths longer than red have significant thermal effects. The infrared drying technology is just utilizing the specific thermal effect. The infrared ray is easy to be absorbed by the object and has radiation, the penetrating power and the electromagnetic wave have the characteristic of special affinity to polar substances, if the water molecule has the characteristic of deep penetration into the material, the internal energy is converted into the object, the object can obtain the heat energy required by drying in a very short time, the internal and external actions are simultaneously carried out, the combined water in the material is more effectively and thoroughly removed, so that the more ideal drying effect is achieved, the energy loss caused by heating a heat transfer medium is avoided, the beneficial energy is saved, meanwhile, the infrared ray is easy to generate, the controllability is good, the heating is rapid, and the drying time is short.
In the spraying production process, infrared baking equipment can be adopted, namely, medium wave infrared rays generated by the catalytic heating plate can be uniformly filled in the furnace chamber through the structural design of the furnace body and the reflecting plate, and the infrared wavelength generated by the product powder mainly absorbing medium wave infrared radiation and catalysis is consistent so as to play a heating role.
At present, two major difficulties exist in temperature monitoring, firstly, a plurality of catalytic heating plates exist in baking equipment, and more catalytic heating plates are positioned in a furnace chamber, so that the comparison requirement between the surface temperature of a product and the temperature of the catalytic heating plates is difficult to meet, and the influence of large difference of local temperature can occur; secondly, the reflectivity uniformity of the reflecting plate is insufficient, which causes the irradiation uniformity in the furnace chamber, and the radiation intensity of the catalytic heating plate can not be adjusted according to the irradiation difference, thereby affecting the curing uniformity.
Generally, before batch production, the comparison presetting between the surface temperature of the product and the temperature of the catalytic heating plate needs to be manually carried out, specifically, two detection points are generally arranged, and for furnace entering temperature measurement and furnace exiting temperature measurement, the temperature of the catalytic heating plate of the furnace entering is controlled according to the surface temperature of the product, and the temperature of the catalytic heating plate of the furnace exiting is controlled according to the temperature of the surface temperature of the product, so that the surface temperature of the product entering and exiting the furnace is in a certain interval, and the temperature of the middle catalytic heating plate is in the temperature interval of the furnace entering and exiting. Therefore, only the temperature interval control of the furnace inlet and outlet can be realized, the condition that the intermediate transition temperature exceeds the temperature range easily occurs, the problem of fault lamps exists in the local catalytic heating plate, and the accurate monitoring can not be realized. In addition, the reflection plate has reflectivity uniformity difference, namely local heat radiation difference exists in the furnace chamber, uniformity general adjustment control is difficult to realize, local fine adjustment difficulty is high, and especially when the aging rate of the reflection plate has curve change, the temperature uniformity adjustment of the furnace chamber is greatly influenced.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides an infrared radiation temperature control method for a spraying production line aiming at the problems of uncontrollable temperature uniformity of the traditional infrared radiation and the like.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an infrared radiation temperature control method for a spraying production line,
the spraying production line is provided with at least one infrared radiation furnace, a plurality of catalytic heating plates are arranged in the infrared radiation furnace, a temperature sensor is arranged on any catalytic heating plate,
the infrared radiation temperature control method comprises the following steps:
s1 simulates the detection of the temperature,
arranging a simulation detection source on the center of a furnace chamber of the infrared radiation furnace, arranging simulation detection points which are in direct-injection correspondence with a plurality of catalytic heating plates one by one on the simulation detection source, and controlling the temperature of the catalytic heating plates to enable the temperature of each simulation detection point to reach a required temperature range;
the S2 records the control temperature,
collecting the temperature of each simulation detection point as TJ1～TJN；
The fine-tuning step of S3 is performed,
the catalytic heating plates are finely adjusted one by one to ensure that the temperature difference range of adjacent simulation detection points is +/-5 ℃, and the temperature difference range of the integral simulation detection points is +/-25 ℃, and then the temperature TK of the catalytic heating plates is obtained1～TKN，
S4 is a synchronous temperature-raising adjustment step,
the temperature of the catalytic heating plate is gradually increased and adjusted, so that the temperature of adjacent simulation detection points is synchronously increased by 5-6 ℃, and the temperature TY of the catalytic heating plate is obtained at the moment1～TYN；
S5 calculates a temperature adjustment coefficient of each catalytic heating panel,
δ1＝△T1/△T2～δN-1＝△TN-1/△TNwherein delta is the regulation coefficient of two corresponding catalytic heating plates, delta T1～△TNThe difference between the temperature control values of the catalytic heating plates;
s6 catalytic heater plate fine tuning reference selection,
obtaining at least three reference catalytic heater plates with the smallest absolute value of the fine tuning temperature difference;
a step of controlling the temperature of S7,
in the temperature adjusting process, the temperature adjusting system of other catalytic heating plates is adjusted according to the adjusting temperature of the catalytic heating plate.
Preferably, the method also comprises an aging resistance fine adjustment step S8,
aging detection test is carried out on the catalytic heating plates, the aging time is S, the temperature changes of the three reference catalytic heating plates and the corresponding simulation detection points are collected, and the temperature of the three reference catalytic heating plates is maintained to be TT1～TT3The temperature difference corresponding to the simulated detection point is delta TS1～△TS3，
In carrying out TT1～TT3The temperature of the simulation test point is raised to the original temperature by temperature rise regulation, and the temperature difference delta TT of the temperature rise regulation is obtained at the moment1～△TT3，
Calculating the attenuation coefficient theta, theta ═ delta TT1+△TT2+△TT3)/(△TS1+△TS2+△TS3)，
In step S7, the accumulated operating time of the reference catalytic heating plate is monitored, the accumulated operating time is SN, and the temperature control is T when the temperature of the reference catalytic heating plate is adjustedAND(1+ θ SN/S), wherein TANDIs the original bit-adjusted value.
The invention has the following beneficial effects:
1. the temperature control correlation of the catalytic heating plates can be realized, the real-time temperature monitoring is realized, the overall temperature control adjustment is carried out through the correlation coefficient, the individual difference of each catalytic heating plate and the adjustment requirement of the temperature difference of the furnace chamber are met, the uniform and stable heating of the product is ensured, the curing stability of the product is improved, and the product percent of pass is greatly improved.
2. The self-adaptive adjusting function of reflectivity attenuation is provided, the temperature of the furnace chamber is stable and uniform, the stable curing temperature is ensured, the phenomena of non-uniform curing and incomplete curing are prevented, and the maintenance, adjustment and control cost is reduced.
Detailed Description
The invention provides an infrared radiation temperature control method for a spraying production line. The technical solutions of the present invention are described in detail below to make them easier to understand and master.
The infrared radiation temperature control method for the spraying production line is characterized in that at least one infrared radiation furnace is arranged on the spraying production line, a plurality of catalytic heating plates are arranged in the infrared radiation furnace, a temperature sensor is arranged on any catalytic heating plate, and the infrared radiation temperature control method comprises the following steps:
the simulation temperature detection is that a simulation detection source is arranged at the center of a furnace chamber of the infrared radiation furnace, simulation detection points which are in direct-injection correspondence with the catalytic heating plates one by one are arranged on the simulation detection source, and the temperature of each simulation detection point is enabled to reach the required temperature range by controlling the temperature of the catalytic heating plates;
recording the comparison temperature, and collecting the temperature of each simulation detection point as TJ1～TJN；
Fine adjustment, namely fine adjustment is carried out on the catalytic heating plates one by one, so that the temperature difference range of adjacent simulation detection points is +/-5 ℃, the temperature difference range of the whole simulation detection points is +/-25 ℃, and the TK of the catalytic heating plates is obtained at the moment1～TKN；
A step of synchronous temperature rise adjustment, in which the catalytic heating plates are subjected to temperature rise adjustment one by one, so that the temperature of adjacent simulation detection points is synchronously raised by 5-6 ℃, and the temperature TY to the catalytic heating plates at the moment1～TYN；
Calculating the temperature coefficient, delta, of each catalytic heating plate1＝△T1/△T2～δN-1＝△TN-1/△TNWherein delta is the regulation coefficient of two corresponding catalytic heating plates, delta T1～△TNFor fine tuning the temperature difference of each catalytic heating plateAn absolute value;
selecting a fine tuning reference of the catalytic heating plate to obtain at least three reference catalytic heating plates with the minimum absolute value of the fine tuning temperature difference;
and a temperature control step of adjusting the temperature of other catalytic heating plates by referring to the temperature of the catalytic heating plate during the temperature adjustment.
Description of specific embodiments:
in one embodiment, 8 catalytic heating plates are arranged in the infrared radiation furnace in an annular distribution, and the catalytic heating plates correspond to 8 simulation detection points respectively.
Wherein TJ1～TJ8The temperature of each catalytic heating plate is required to be adjusted within the range of 200-240 ℃ so as to enable TJ1～TJ8Becomes smaller and is set according to the temperature values of the adjacent TJs. The step can be correspondingly optimized and adjusted through software, and the TJ is supposed to be taken in a mode of relative comparison interval1At 210 ℃ adjacent to the TJ2At 240 ℃, TJ is adjusted by correspondingly lowering the temperature of the catalytic heating plate2Cooling to 215 deg.C, and adjusting temperature of catalytic heating plate to obtain TJ3And TJ2Controlled within 5 deg.C, so as to be finely adjusted one by one, when the temperature of three adjacent spans is adjusted, taking the middle adjustment value to carry out differential adjustment, for example, TJ1At 210 ℃ and TJ2At 240 ℃ and TJ3At 220 ℃ and TJ4At 240 ℃, the coordination between the first catalytic heating plate and the second catalytic heating plate is firstly carried out, and then the coordination between the first catalytic heating plate and the third catalytic heating plate is carried out, which belongs to automatic logic regulation and control and simple mathematical coordination, and is not described herein again.
The temperature TK of the catalytic heating plate is obtained1～TKN，TK1＝571℃，TK2＝603℃，TK3＝641℃，TK4＝600℃，TK5＝655℃，TK6＝597℃，TK7＝609℃，TK8＝588℃。
Synchronous temperature rise adjustment step, namely, the catalytic heating plates are heated one by oneAdjusting to ensure that the temperature of adjacent simulation detection points is synchronously raised by 5-6 ℃, and the temperature TY to the catalytic heating plate at the moment1～TYN。
After adjustment, TJ1＝582℃，TJ2＝612℃，TJ3＝652℃，TJ4＝622℃，TJ5＝672℃，TJ6＝612℃，TJ7＝633℃，TJ8＝602℃。
At this time delta1＝11/9～δN-124/14, i.e. when temperature rise adjustment is performed, assume TJ2When the temperature needs to be raised by 10 ℃, then TJ1Has a temperature rise value of delta1And 10 ℃, taking the temperature as a reference to perform temperature rise adjustment of the corresponding catalytic heating plate, wherein the temperature reduction value is a relative temperature reduction value multiplied by a coefficient.
It should be noted that, when performing the adjustment, the three catalytic heating plates with the smallest absolute value are selected as the adjustment reference, that is, the position temperature control curves of the three catalytic heating plates are most stable, so as to perform the temperature adjustment.
In particular, assume that the three catalytic heating plates with the smallest absolute value are TJ1、TJ2、TJ6Then with TJ2Calculating TJ3With TJ6Calculating TJ5And TJ7Then using TJ7Calculating TJ8With TJ5Or TJ3Calculating TJ4Generally, the estimated span does not exceed 2 th order, that is, 2 nd order estimation, and when temperature rise or temperature fall control is performed, TJ1、TJ2、TJ6And (4) carrying out constant-addition or constant-subtraction temperature regulation, and carrying out proportional plus-minus temperature regulation and control on other catalytic heating plates according to the proportional coefficient.
The infrared radiation temperature control method belongs to temperature pre-regulation control before batch production, and experience data regulation also exists in the actual application process.
The real-time temperature of each catalytic heating plate is monitored, secondary correction coefficient adjustment can be carried out, and corresponding delta adjustment is carried out according to empirical data, such as: after a period of use, Δ T is performed1～△TNAnd drawing a corresponding temperature control curve atDuring the process of carrying out the secondary correction coefficient, delta T is carried out1～△TNThe delta can be set differently at different temperature intervals, for example, in the interval of 150-180 ℃, the coefficient in the temperature interval is calculated, in the interval of 160-190 ℃, the coefficient in the temperature interval is calculated, and then the normalization coefficient is calculated for the overlapping temperature areas, thereby obtaining the reference coefficient applicable to the two temperature intervals.
In one embodiment, an aging resistance fine adjustment step is further provided.
Aging detection test is carried out on the catalytic heating plates, the aging time is S, the temperature changes of the three reference catalytic heating plates and the corresponding simulation detection points are collected, and the temperature of the three reference catalytic heating plates is maintained to be TT1～TT3The temperature difference corresponding to the simulated detection point is delta TS1～△TS3。
In carrying out TT1～TT3The temperature of the simulation test point is raised to the original temperature by temperature rise regulation, and the temperature difference delta TT of the temperature rise regulation is obtained at the moment1～△TT3。
Calculating the attenuation coefficient theta, theta ═ delta TT1+△TT2+△TT3)/(△TS1+△TS2+△TS3)。
In step S6, the accumulated operating time of the reference catalytic heating plate is monitored, the accumulated operating time is SN, and the temperature control is T when the temperature of the reference catalytic heating plate is adjustedAND(1+ θ SN/S), wherein TANDIs the original bit-adjusted value.
Specifically, the reflection plate is aged to a certain degree, namely, after the radiation intensity of the catalytic heating plate is maintained to a certain degree, the surface is heated to have attenuation difference, in the scheme, attenuation coefficient calculation is performed, the actual temperature of the catalytic heating plate is assumed to be 600 ℃, the actual temperature corresponding to the monitoring point is 204 ℃ at the moment, after the catalytic heating plate operates for a period of time, the actual temperature of the catalytic heating plate is still 600 ℃, the actual temperature corresponding to the monitoring point is 192 ℃, the radiation intensity of the catalytic heating plate needs to be increased at the moment, and when the actual temperature is 611 ℃, the actual temperature corresponding to the monitoring point is 204 ℃. From this, the attenuation coefficient θ of the mean value was calculated with three reference catalytic heating plates as references.
When temperature control of the catalytic heating plate is performed, let T beANDThe temperature needs to be adjusted to 610 ℃, theta is 0.01, the accumulated working time is 120h, the aging time is 12h, and the temperature is 610 ℃ (1+ 0.01) 120/12) according to the temperature control requirement, so that the aging attenuation complement requirement can be met, and the temperature control is ensured to be stable and reliable.
Through the above description, it can be found that the infrared radiation temperature control method for the spray coating production line can realize temperature control correlation of the catalytic heating plates, perform real-time temperature monitoring, perform overall temperature control adjustment through the correlation coefficient, meet the requirements of individual difference and furnace chamber temperature difference adjustment of each catalytic heating plate, ensure uniform and stable heating of products, improve the curing stability of the products and greatly improve the product yield. The self-adaptive adjusting function of reflectivity attenuation is provided, the temperature of the furnace chamber is stable and uniform, the stable curing temperature is ensured, the phenomena of non-uniform curing and incomplete curing are prevented, and the maintenance, adjustment and control cost is reduced.
The technical solutions of the present invention are fully described above, it should be noted that the specific embodiments of the present invention are not limited by the above description, and all technical solutions formed by equivalent or equivalent changes in structure, method, or function according to the spirit of the present invention by those skilled in the art are within the scope of the present invention.
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