CN114442696A - Temperature control system and method - Google Patents
Temperature control system and method Download PDFInfo
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Abstract
The invention relates to the technical field of plate processing, in particular to a temperature control system, which comprises a heat-conducting oil heater, a heating oil pipe and an insulation can, wherein the heating oil pipe is connected with the heat-conducting oil heater, the heating oil pipe is arranged in the insulation can, and the temperature control system is characterized in that: the control system also comprises an input unit, a temperature sensor, a temperature adjusting actuator and a controller, wherein the controller receives signals of the input unit and the temperature sensor and outputs a control signal to control the temperature adjusting actuator; a temperature control method is used for controlling the temperature of an incubator and comprises the following steps: s1, setting a target temperature value; s2, acquiring a detection temperature value; s3, calculating the ratio of the detected temperature value to the target temperature value; s4, determining a control signal according to the ratio; s5, controlling the temperature adjusting actuator according to the control signal; s6, repeating the steps S2, S3, S4, S5 at preset time intervals until the ratio is equal to 1.
Description
Technical Field
The invention belongs to the technical field of plate processing, and particularly relates to a temperature control system and method, which are used for controlling the temperature of an insulation box in the plate purification process.
Background
Accelerate the release of formaldehyde in the panel through the mode of heating among the prior art to reach the purpose of purifying panel, concrete implementation process adopts and arranges panel in the incubator, heats in the incubator and accelerates the formaldehyde release, in order to reach certain purifying effect, the heating generally adopts heat conduction oil pipe to carry out the mode of heat exchange, this kind of mode has higher thermal efficiency, can carry out the heat exchange fast, but to heating the incubator, this kind of mode is not high to the control accuracy of temperature, probably leads to panel deformation damage.
Disclosure of Invention
The invention provides a temperature control system, which aims to solve the problems and comprises a heat-conducting oil heater, a heating oil pipe and an insulation box, wherein the heating oil pipe is connected with the heat-conducting oil heater, the heating oil pipe is arranged in the insulation box, a proportional valve is arranged on the heating oil pipe, the control system also comprises an input unit, a temperature sensor, a temperature adjusting actuator and a controller, and the controller receives signals of the input unit and the temperature sensor and outputs a control signal of the proportional valve.
The utility model provides a temperature control system, including the conduction oil heater, with heating oil pipe and insulation can that the conduction oil heater is connected, the heating oil pipe sets up in the insulation can, control system still includes input unit, temperature sensor, the executor that adjusts the temperature and controller, the controller receives input unit and temperature sensor's signal and output control signal is used for controlling the executor that adjusts the temperature.
Furthermore, the temperature adjusting actuator comprises a proportional valve arranged on the heating oil pipe, and/or an air outlet is arranged below the heating oil pipe, and an air inlet is arranged on the circulating fan at the upper part of the heat preservation box.
Further, the method also comprises the following steps:
s1, setting a target temperature value;
s2, acquiring a detection temperature value;
s3, calculating the ratio of the detected temperature value to the target temperature value;
s4, determining a control signal according to the ratio;
s5, controlling the temperature adjusting actuator according to the control signal;
s6, repeating the steps S2, S3, S4, S5 at preset time intervals until the ratio is equal to 1.
Further, the control signal comprises an opening degree control signal and/or a power control signal, the control signal is used for adjusting the valve opening amount of the proportional valve and/or the output power of the circulating fan, and the valve opening amount of the proportional valve and the output power of the circulating fan have the same change trend;
further, the ratio and the opening amount of the proportional valve satisfy the following relationship:
wherein R represents the ratio, K represents the opening amount of the proportional valve, and KmaxShows the maximum opening amount, K, of the proportional valveiFor the precise control valve opening amount corresponding to the precise control interval, (0, A)0]In the coarse control interval, (A)0，+∞]For the fine control interval, A is0Is a threshold value fitted from historical data.
Further, said R ∈ (A)0，+∞]，K＝KiThe method specifically comprises the following steps:
wherein K1＞K2＞K3＞K4，A0＜A1＜A2＜A3。
Further, when K ═ K1At a speed V corresponding to the temperature rise in the incubator1；
When K is equal to K2At a speed V corresponding to the temperature rise in the incubator2；
When K is equal to K3At a speed V corresponding to the temperature rise in the incubator3；
When K is equal to K4At a speed V corresponding to the temperature rise in the incubator4；
Wherein, V1＞V2＞V3＞V4。
Further, said Kmax、K1、K2、K3、K4The difference value of every two adjacent values satisfies an equal difference relation, namely:
Kmax-K1＝K1-K2+Δ；
K1-K2＝K2-K3+Δ；
K2-K3＝K3-K4+Δ。
further, the ratio and the output power of the circulating fan satisfy the following relation:
wherein R represents the ratio, P represents the output power of the circulating fan, PeIndicating the rated power, P, of the circulating faniFor the precisely controlled output power corresponding to the precisely controlled interval, (0, A)0]In the coarse control interval, (A)0，+∞]For the fine control interval, A is0Is a threshold value fitted from historical data.
Further, said R ∈ (A)0，+∞]，P＝PiThe method specifically comprises the following steps:
wherein P is1＞P2＞P3＞P4，A0＜A1＜A2＜A3。
When P is equal to P1At a speed V corresponding to the temperature rise in the incubator1；
When P is equal to P2At a speed V corresponding to the temperature rise in the incubator2；
When P is equal to P3At a speed V corresponding to the temperature rise in the incubator3；
When P is equal to P4When the temperature in the corresponding heat preservation box rises at a speed V4；
Wherein, V1＞V2＞V3＞V4。
The P ise、P1、P2、P3、P4The difference value of every two adjacent values satisfies an equal difference relation, namely:
Pe-P1＝P1-P2+Δ；
P1-P2＝P2-P3+Δ；
P2-P3＝P3-P4+Δ。
the invention has the following beneficial effects: the method comprises the steps of comparing a target temperature value with a detected temperature value to obtain a ratio of the target temperature value and the detected temperature value, controlling the opening of a proportional valve for controlling the flow of a heating oil pipe by taking the ratio as a basic factor of control logic, receiving a temperature signal through a controller, comparing and calculating the output control signal, realizing automatic and real-time temperature control, improving the precision of temperature control in a heat preservation box, reducing the possibility of deformation of a plate and ensuring effective real-time formaldehyde purification.
Drawings
FIG. 1 is a schematic diagram of a temperature control system in an embodiment of the invention;
FIG. 2 is a schematic view of a heating oil pipe structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a temperature control method according to an embodiment of the present invention;
FIG. 4 is a schematic view of a valve opening variation in the embodiment of the present invention;
FIG. 5 is a schematic diagram of a variation histogram of an output power meter according to an embodiment of the present invention;
description of the drawings: the method comprises the following steps of 1-an insulation can, 2-a heating oil pipe, 3-a heat conducting oil heater, 4-an input unit, 5-a temperature sensor, 6-a controller, 7-a proportional valve, 8-a circulating fan, 9-a variable frequency pump and 10-a plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The sheet material 10 of the present invention is studied to include particle board, solid board, and laminated board types, and thus the critical value a is analyzed0In the case of performing experiments and studies on the particle board, it was found that when A is related to the kind, density, thickness, etc. of the board material 100When the temperature in the heat-insulating box 1 is 0.5, the plate material 10 is more strongly deformed as the temperature in the heat-insulating box 1 is higher, and therefore, when the particle board in the heat-insulating box 1 is subjected to the formaldehyde removal treatment, a is selected00.5, the corresponding coarse control interval is (0, 0.5)]The fine control interval is (0.5, + ∞)]。
Preferably, the invention divides the fine control interval into four intervals including a first fine control interval (A)0，A1]Second fine control interval (A)1，A2]And the third fine control interval (A)2，A3]Fourth fine control interval (A)3And + ∞) compared with the three sections in the prior art, the temperature in the incubator 1 can be more accurately controlled, so that the deformation rate and the cracking degree of the plate 10 can be reduced while the temperature rise is satisfied to remove formaldehyde.
As a preferable scheme, the placing mode of the plate 10 refers to the name of application No. CN 202121451608.8: the utility model provides a plank of wood-based material board grillage utility model patent, panel 10 are placed on plank of wood-based material board grillage dries in air, are vertical state, when needs remove formaldehyde to it high temperature, need satisfy:
speed V of temperature rise in incubator 11＞V2＞V3＞V4；
Valve opening amount K of proportional valve 71＞K2＞K3＞K4；
Kmax-K1＝K1-K2+Δ；
K1-K2＝K2-K3+Δ；
K2-K3＝K3-K4+ Δ. Where Δ is a tolerance determined according to the kind, density, thickness, etc. of the sheet material.
Output power P of circulating fan 81＞P2＞P3＞P4；
Pe-P1＝P1-P2+Δ；
P1-P2＝P2-P3+Δ；
P2-P3＝P3-P4+ Δ. Where Δ is a tolerance determined according to the kind, density, thickness, etc. of the sheet material.
The first precise control interval is (A)0，A1]The second fine control interval is (A)1，A2]The third fine control interval is (A)2，A3]The fourth fine control interval is (A)3, + ∞) of said A0＜A1＜A2＜A3；
The change trends of the circulating fan 8 and the proportional valve 7 are the same, and the temperature rise is guaranteed as follows:
when the ratio R is in the coarse control interval (0, A)0]During the time, the valve opening amount of the proportional valve 7 is the largest at the moment, the output power of the circulating fan 8 is the rated power, the air outlet of the circulating fan 8 is arranged below the heating oil pipe 2, the air at the air outlet is blown into the inner cavity of the heat preservation box 1 after passing through the heating oil pipe 2, so that the heat of the heating oil pipe 2 is uniformly conducted into the heat preservation box 1, the upper portion of the vertically placed plate 10 can be uniformly heated, the plate in the heat preservation box 1 can be rapidly heated, the corresponding temperature increase speed of the coarse control interval is rapid, and the corresponding heat exchange acting on the plate 10 is relatively rapid.
When the ratio R is within the fine control interval of (0.5, + ∞), the valve opening amount of the proportional valve 7 is gradually reduced until 0%, the temperature rise speed corresponding to the fine control interval is gradually slowed, the corresponding heat exchange acting on the plate 10 is relatively mild, the output power of the corresponding circulating fan 8 is gradually reduced until 0, and the plate 10 placed vertically is ensured to be uniformly heated by bidirectional control so as to achieve the purpose of removing formaldehyde, and simultaneously, the probability of deformation and cracking of the plate 10 is reduced.
As shown in fig. 1, a temperature control system comprises a heat-conducting oil heater 3, a heating oil pipe 2 connected with the heat-conducting oil heater 3, an insulation box 1, an input unit 4, a temperature sensor 5 and a controller 6, wherein the heating oil pipe 2 is arranged in the insulation box 1, the heating oil pipe 2 is provided with a proportional valve 7, and the controller 6 receives signals of the input unit 4 and the temperature sensor 5 and outputs a control signal of the proportional valve 7.
The proportional valve 7 can adopt an electric proportional valve 7 or an electromagnetic proportional valve 7, the proportional valve 7 is arranged between the heat-conducting oil heater 3 and the heat-insulating box 1, the influence of high-temperature and high-humidity environment in the heat-insulating box 1 is avoided, and the control precision, the durability and the like of the proportional valve can be ensured; the input unit 4 can adopt a conventional human body input device to input a target temperature value to the controller 6, the temperature sensor 5 detects the current temperature value in the heat preservation box 1 and sends a detection result to the controller 6, the controller 6 sends a control signal to the proportional valve 7 to control the opening degree of the proportional valve 7, the part of the heating oil pipe 2 positioned in the heat preservation box 1 is provided with radiating fins on the outer surface, the heat exchange rate of the heating oil pipe 2 and the air in the heat preservation box 1 is accelerated, the time length of the whole temperature control process is shortened, namely, the time length of the purification of the plate 10 is shortened, and the productivity is improved; the controller 6 adopts a programmable logic controller 6, namely a PLC, the basic parameters and the control logic based on the system are relatively simple, the reliability of the system can be fully exerted by adopting the PLC, and the overall robustness of the system is improved.
The heat conducting oil heater 3 can adopt a special heater or a boiler mode to heat the heat conducting oil, and generally, the temperature of hot oil in the heating oil pipe 2 entering the heat insulation box 1 is about 220 ℃.
Preferably, the temperature control system further comprises a variable frequency pump 9, and the variable frequency pump 9 is located on an oil pipe outside the incubator 1 and used for conveying oil and pressurizing the oil.
Preferably, the temperature control system further comprises a circulating fan 8, and the circulating fan 8 is controlled by the output signal of the controller 6.
As preferred scheme, 8 air outlets of circulating fan set up in heating oil pipe 2 below, 8 air inlets of circulating fan set up on 1 upper portion of insulation can, arrange heating oil pipe 2 below in with 8 air outlets of circulating fan, accelerate the air flow rate near heating oil pipe 2, further accelerate the efficiency of heat exchange, the air in insulation can 1 circulates between air inlet and air outlet and flows, let the air flow in whole insulation can 1 get up, form thermal cycle, can ensure the inside temperature evenly distributed of box, be favorable to protecting panel 10 can not because of the deformation that local temperature distributes the inequality and leads to.
The invention also provides a temperature control method for controlling the temperature of the heat preservation box 1, which comprises the following steps:
s1, setting a target temperature value;
s2, acquiring a detection temperature value;
s3, calculating the ratio of the detected temperature value to the target temperature value;
s4, presetting a proportional valve 7 opening control signal corresponding to the ratio;
s5, determining an opening control signal of the proportional valve 7 according to the calculated ratio, and controlling the opening of the proportional valve 7 through the opening control signal of the proportional valve 7;
s6, repeating the steps S2, S3, S4, S5 at preset time intervals until the ratio equals to 1.
The target temperature value is set through the input unit 4, the temperature value detected in the heat insulation box 1 is detected through the temperature sensor 5, the two values are sent to the controller 6 in a signal transmission mode, the controller 6 calculates the ratio of the detected temperature value to the target temperature value, the ratio reflects the difference between the current temperature and the target temperature, generally, the value is a certain value between 0 and 1, along with the purification operation, it can be roughly predicted that the temperature in the heat insulation box 1 is close to the current room temperature under the condition that the purification operation is carried out for the first time, generally, a certain deviation exists between 20 ℃ and two seasons of winter and summer, the ratio of the two values is 0.2 under the condition that the purification operation is carried out for the first time, the meaning of the detection temperature value and the target temperature value is obviously different from each other, and it can be understood that the ratio is equal to 1 which is the final result of the whole temperature control process, with the purification operation, the temperature in the heat preservation box 1 reaches the target temperature, namely 100 ℃ after a certain time, the temperature change in the heat preservation box 1 in the heat preservation stage is small, and the constant temperature can be realized through a small amount of thermal compensation.
The working temperature of the heat preservation box 1 is generally 60-120 ℃, and the specific control mode is to control the flow of hot oil in the heating oil pipe 2 by adjusting the opening of the proportional valve 7, so as to control the heat exchange rate.
Preferably, the detected temperature value is an average value of temperature values detected at a plurality of measuring points in the heat insulation box 1, the heat exchange is a process, the temperature of the air near the heating oil pipe 2 rises first and gradually spreads to the whole heat insulation box 1 along with the time, then for the accuracy of the temperature detection, a plurality of temperature sensors 5 can be arranged for detection, and the temperature sensors 5 are arranged at positions far away from the heating oil pipe 2 to obtain the average temperature of the plurality of measuring points so as to ensure that the detected temperature is closer to the actual temperature, thereby providing the accuracy of the temperature control.
As an optimal scheme, the ratio is divided into a plurality of grades, the ratio of one grade corresponds to an opening control signal of the proportional valve 7, deformation is possibly generated on the plate 10 under the heating condition, and the plate 10 can be well protected in a stable heating state.
Preferably, the ratio and the opening degree of the proportional valve 7 satisfy the following relationship:
wherein R represents the ratio, K represents the opening of the proportional valve 7, KmaxIndicating the maximum opening of the proportional valve 7.
At the heating process initial stage, the temperature in insulation can 1 is in the tolerance within range of panel 10, can hardly take place deformation, and consideration that this moment can be more saves time cost for heat exchange rate, so heat exchange rate that the heating initial stage can be controlled at a higher level, proportional valve 7 reaches the maximum aperture, after heating to certain degree, panel 10 warp the risk increase, reduces heat exchange rate this moment to protection panel 10 heaies up for the direction.
Preferably, the maximum opening of the proportional valve 7 is 90%.
Preferably, step S4 further includes: and presetting a circulating fan 8 control signal corresponding to the ratio, wherein the circulating fan 8 control signal controls the opening and closing and the output power of the circulating fan 8.
Preferably, the ratio and the opening and closing and the output power of the circulating fan 8 satisfy the following relationship:
wherein XnIndicating that the circulating fan 8 is on, XfIndicating that the circulator blower 8 is turned off, P indicating the output power of the circulator blower 8, PeIndicating the circulating fan 8 power rating.
According to the strategy that the air outlet of the circulating fan 8 is arranged below the heating oil pipe 2 to play a role in accelerating heat exchange, according to the embodiment, the protection of the plate 10 and the shortening of the purification process are taken as main consideration factors, the opening and closing and the output power control of the circulating fan 8 also adopt the same thought, the circulating fan 8 works at rated power in the initial heating stage, the maximum air volume is output, the heat exchange rate is increased, when the temperature reaches the temperature which possibly influences the deformation of the plate 10, the output power is reduced to reduce the heat exchange efficiency, the normal opening of the circulating fan 8 is necessary, the aim is to ensure the uniform distribution of the temperature in the heat insulation box 1 and avoid the deformation of the plate 10 caused by uneven surface heating, of course, after the temperature in the heat insulation box 1 reaches the target temperature, the heat exchange is in a lower stable state, the circulating fan 8 can be closed, and the energy-saving effect is achieved, the temperature possibly influencing the deformation of the plate 10 is not a fixed value, the material, density, thickness and the like of different plates 10 have influence, corresponding data can be obtained through limited experiments to guide a temperature control strategy, the influence of various factors on the temperature control is fully considered in the equipment research and development process, a perfect temperature control digital model can be established, and the development of related industries for purifying the plate 10 is facilitated.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a temperature control system, including conduction oil heater (3), with heating oil pipe (2) and insulation can (1) that conduction oil heater (3) are connected, heating oil pipe (2) set up in insulation can (1), its characterized in that: the control system further comprises an input unit (4), a temperature sensor (5), a temperature adjusting actuator and a controller (6), wherein the controller (6) receives signals of the input unit (4) and the temperature sensor (5) and outputs a control signal to control the temperature adjusting actuator.
2. A temperature control system according to claim 1, wherein: the temperature adjusting actuator comprises a proportional valve (7) arranged on the heating oil pipe (2) and/or a circulating fan (8) with an air outlet arranged below the heating oil pipe (2) and an air inlet arranged at the upper part in the heat preservation box (1).
3. A temperature control method is used for controlling the temperature of an incubator (1), and is characterized in that: the method comprises the following steps:
s1, setting a target temperature value;
s2, acquiring a detection temperature value;
s3, calculating the ratio of the detected temperature value to the target temperature value;
s4, determining a control signal according to the ratio;
s5, controlling the temperature adjusting actuator according to the control signal;
s6, repeating the steps S2, S3, S4, S5 at preset time intervals until the ratio is equal to 1.
4. A temperature control method according to claim 3, characterized in that: the above-mentioned
The control signal comprises an opening degree control signal and/or a power control signal, the control signal is used for adjusting the valve opening amount of the proportional valve (7) and/or the output power of the circulating fan (8), and the valve opening amount of the proportional valve (7) and the output power of the circulating fan (8) have the same change trend.
5. A temperature control method according to claim 4, characterized in that: the ratio and the valve opening amount of the proportional valve (7) satisfy the following relation:
wherein R represents the ratio, K represents the opening amount of the proportional valve (7), and KmaxRepresents the maximum valve opening amount, K, of the proportional valve (7)iFor the precise control valve opening amount corresponding to the precise control interval, (0, A)0]In the coarse control interval, (A)0,+∞]For the fine control interval, A is0Is a threshold value fitted from historical data.
6. A temperature control method according to claim 5, characterized in that: the R epsilon (A)0,+∞],K＝KiThe method specifically comprises the following steps:
wherein K1＞K2＞K3＞K4，A0＜A1＜A2＜A3，i＝1、2、3、4。
7. A temperature control method according to claim 6, characterized in that:
when K is equal to K1When the temperature in the corresponding insulation can (1) rises, the speed is V1；
When K is equal to K2When the temperature in the corresponding insulation can (1) rises, the speed is V2；
When K is equal to K3When the temperature in the corresponding insulation can (1) rises, the speed is V3；
When K is equal to K4When the temperature in the corresponding insulation can (1) rises, the speed is V4；
Wherein, V1＞V2＞V3＞V4。
8. A temperature control method according to claim 7, characterized in that: said Kmax、K1、K2、K3、K4The difference value of every two adjacent values satisfies an equal difference relation, namely:
Kmax-K1＝K1-K2+Δ；
K1-K2＝K2-K3+Δ；
K2-K3＝K3-K4+Δ。
9. a temperature control method according to claim 4, characterized in that: the ratio and the output power of the circulating fan (8) satisfy the following relation:
wherein R represents the ratio, P represents the output power of the circulating fan (8), PeRepresents the rated power, P, of the circulating fan (8)iFor the precisely controlled output power corresponding to the precisely controlled interval, (0, A)0]In the coarse control interval, (A)0,+∞]For the fine control interval, A is0Is a threshold value fitted from historical data.
10. A temperature control method according to claim 9, characterized in that: the R epsilon (A)0,+∞],P＝PiThe method specifically comprises the following steps:
wherein P is1＞P2＞P3＞P4，A0＜A1＜A2＜A3，i＝1、2、3、4。
When P is equal to P1When the temperature in the corresponding insulation can (1) rises, the speed is V1；
When P is equal to P2When the temperature in the corresponding insulation can (1) rises, the speed is V2；
When P is equal to P3When the temperature in the corresponding insulation can (1) rises, the speed is V3；
When P is equal to P4When the temperature in the corresponding insulation can (1) rises, the speed is V4；
Wherein, V1＞V2＞V3＞V4。
The P ise、P1、P2、P3、P4The difference value of every two adjacent values satisfies an equal difference relation, namely:
Pe-P1＝P1-P2+Δ；
P1-P2＝P2-P3+Δ；
P2-P3＝P3-P4+Δ。
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