CN109582060B - Intelligent control system of liquid bath temperature control device - Google Patents
Intelligent control system of liquid bath temperature control device Download PDFInfo
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Abstract
The invention discloses an intelligent control system of a liquid bath temperature control device, which takes a temperature control instrument as a core controller component, develops a temperature curve high-precision control algorithm based on the temperature control instrument, and controls the power of a heating element by adopting the duty ratio of a solid-state relay to realize the control of a heating process; the invention can meet various application requirements on temperature processing technology, and is suitable for occasions where the temperature processing process is dangerous, the temperature control process is high-precision, needs remote operation and has complex process parameters.
Description
Technical Field
The invention relates to the technical field of intelligent temperature control, in particular to an intelligent control system of a liquid bath temperature control device.
Background
The liquid bath temperature environment is widely applied to the fields of industrial manufacturing such as material manufacturing, food chemical industry, biology and the like and environmental testing, and the temperature control precision determines the manufacturing quality of industrial products and also determines the accuracy of test data in the environmental testing process. Compared with a pressure and flow control system, the temperature control system has the characteristics of large inertia and large delay, and the temperature control difficulty of the rapid heating and cooling system controlled by a high-precision temperature curve is directly higher.
At present, a certain process needs to realize rapid temperature rise and temperature reduction of the liquid bath environment temperature in the liquid bath environment, the control precision is up to +/-0.05 ℃, the temperature is required to be controlled according to a set curve in the temperature rise and temperature reduction process, and the number of temperature continuous control curves in a single process is not less than 100.
The existing liquid bath temperature control system can only realize the temperature control of a target termination temperature value, has low temperature control precision, cannot realize the high-precision temperature curve control in the temperature change process, cannot realize the automatic sequential control of a multi-section continuous set temperature curve, and does not have the background intelligent management function of temperature data in the temperature control process.
In order to construct a set of low-cost and intelligent liquid bath temperature control device, realize the continuous and sequential control of a plurality of sections of temperature setting curves in a temperature process, realize the background intelligent data management function of temperature data, and realize the control precision of +/-0.05 ℃, the invention needs to invent a liquid bath temperature control system with advanced performance, low cost and intelligent function.
Disclosure of Invention
The invention aims to overcome the defects in the background technology and provides an intelligent control system of a liquid bath temperature control device, which specifically comprises a heating and cooling mechanism design, a temperature control system design, an intelligent integrated temperature control software design and a high-precision temperature control algorithm design method of the liquid bath temperature control device.
In order to achieve the technical effects, the invention adopts the following technical scheme:
firstly, the invention discloses a design requirement of a heating and cooling mechanism of a liquid bath device, which at least meets the following requirements: the liquid bath device adopts medium oil or water as a liquid medium to realize a heating or cooling temperature process; the heating and cooling mechanism of the liquid bath temperature control device at least needs to be provided with a heating element, a cooling device and a liquid bath internal circulation element in function, wherein the heating element needs to meet the control requirement of the fastest temperature rising speed of the liquid bath device, and the cooling device needs to meet the control requirement of the fastest temperature falling speed of the liquid bath device.
Meanwhile, the design requirements of an intelligent control system of the liquid bath temperature control device at least meet the following requirements: the automatic power supply and power failure control function of the liquid bath temperature control device is achieved; the temperature control and alarm device is provided with two temperature measurement loops, wherein one loop is used for temperature control and measurement, and the other loop is used for temperature alarm and measurement; the liquid level measurement protection function is provided, the temperature controller is provided, and the duty ratio of the solid-state relay is controlled by the controller to control the duty ratio of the heating element or the cooling element so as to realize the control of the heating and cooling processes; the system is provided with a control computer, and the computer runs integrated multifunctional control software.
The design requirements of the integrated multifunctional control software at least meet the following requirements: the computer control software is realized by adopting computer configuration software and other software with a human-computer interaction function; the computer software has a communication protocol of the intelligent instrument and can realize real-time bidirectional and wide bandwidth transmission of parameters of the intelligent instrument; the computer configuration software has the functions of starting and stopping control in the acquisition process, setting a temperature control curve, monitoring the temperature control process curve, historical storage and query derivation of temperature data and the like.
Meanwhile, the invention also discloses the design requirements of the fast-response high-precision temperature curve control algorithm, which at least meet the following requirements: the device has the functions of controlling a temperature target value fixed value and a program calculated value and is used for selecting a target termination value control function or a process high-precision curve control function; the constant value selecting function and the program calculating value function of the duty ratio of the solid-state relay are provided, and the constant value selecting function and the program calculating value function are used for selecting the constant value opening of the fixed solid-state relay in the heating or cooling process or calculating the opening value of the solid-state relay according to a control algorithm; the control algorithm has an inhibiting effect on large inertia and large delay of the temperature control process, and can realize the functions of rapid temperature rise and temperature reduction; the control algorithm has a prediction effect on temperature control, and can feed forward control the temperature rising and reducing processes of the temperature control.
Aiming at the design requirements of the heating and cooling mechanism of the liquid bath device, the invention discloses a design of a low-cost intelligent liquid bath temperature control device, which specifically comprises the following steps:
1) the liquid bath device adopts medium oil, water or other liquid media to realize the heating or cooling temperature process; specifically, the liquid medium should be made of non-evaporation type or small amount of evaporation type material as much as possible;
2) the liquid bath temperature control device at least comprises a heating element, a cooling device and a liquid bath internal circulation element; the heating element, the cooling part and the medium circulating part are reasonably distributed, so that the temperature constancy of a liquid bath working area is quickly realized, if the heating element and the cooling part are simultaneously arranged on two side walls of the liquid bath temperature groove, the liquid medium is heated or cooled from two sides simultaneously, the medium circulating part is arranged in the middle of the bottom of the liquid bath temperature groove, so that the heated or cooled liquid medium is fully mixed, wherein the heating element meets the control requirement of the fastest heating speed of the liquid bath temperature control device, and the cooling device needs to meet the control requirement of the fastest cooling speed of the liquid bath temperature control device;
3) the liquid bath internal circulation element is matched with the heating speed and the cooling speed so as to reduce the delay time characteristic of the temperature control system as much as possible; the liquid bath internal circulation element always operates in the operation process of the heating element and the cooling device, so that the liquid bath temperature is homogenized within the designed delay time;
4) the temperature sensors of the liquid bath temperature control device are flexibly arranged and are specifically arranged at the edge position of the temperature processing area, so that the interference of the sensors on the temperature processing working area can be prevented, and the temperature of the liquid bath temperature tank can be accurately reflected;
5) still lay liquid level sensor in the liquid bath temperature control device, prevent that the liquid level reduces and causes equipment function incomplete or incident.
Aiming at the design requirements of the temperature control system of the heating and cooling system of the liquid bath temperature control device, the invention particularly discloses a design of an intelligent control system of a low-cost intelligent liquid bath temperature control device, which specifically comprises the following steps:
1) the temperature control system at least has the automatic power-on and power-off control functions of the liquid bath temperature control device realized by a relay-contactor loop, the heating start-stop control function realized by the heating element duty ratio controlled by a silicon controlled element, and the cooling start-stop control function realized by the cooling element duty ratio controlled by the silicon controlled element, so that the power utilization safety control of equipment is realized, and the control of a temperature process control process is also realized;
2) the temperature control device at least comprises two sensors and two temperature measurement loops, wherein the two sensors are arranged in a temperature processing working area of the liquid bath temperature control device; one path of measuring sensor is used for temperature control, and the other path of sensor is used for temperature alarm; the layout of the two sensors is used for automatically judging whether the liquid bath temperature control device fails; when the temperature exceeds a preset value, a heating electric loop is cut off, and an operator is informed in an audible and visual alarm mode;
3) the liquid level measurement protection function is realized, the heating and cooling electric loop is cut off after the liquid level is lower than the lower limit, and an operator is informed in an audible and visual alarm mode;
4) in the temperature control process, a temperature control instrument is taken as a core controller, and a temperature curve high-precision control algorithm is developed based on the temperature control instrument; the real-time temperature value is accessed into a temperature control instrument through a temperature control system, the output value of the solid-state relay is calculated through a temperature curve high-precision control algorithm of the temperature control instrument and is output to the solid-state relay, and an alarm instrument is taken as a core controller in the temperature alarm process;
5) controlling the power of the heating element by adopting the duty ratio of the solid-state relay to realize the control of the heating process; controlling the on-off time of the cooling element by controlling the duty ratio of the solid-state relay so as to realize the control of the cooling process; the duty ratio control of the solid-state relay is realized by adopting a temperature control instrument;
6) the temperature control device is provided with a control computer, the computer runs integrated multifunctional control software, and the control computer and the temperature control instrument realize communication by adopting a Modbus communication protocol through a serial port communication interface.
Meanwhile, the invention also discloses a method for realizing the integrated multifunctional control software, which specifically comprises the following steps:
1) the communication function realization method of the integrated multifunctional control software and the temperature control system comprises the following steps: the temperature control instrument and the alarm instrument are both provided with serial port communication interfaces, adopt a standard communication protocol and provide an SDK (Software development Kit) file; the integrated multifunctional control software is provided with a communication driving interface and a protocol of the intelligent instrument, and the access and control of variables (including logic control switch variables, analog data variables and the like) of the intelligent control instrument on the integrated multifunctional control software can be realized through the SDK file;
2) the integrated multifunctional control software implementation method comprises the following steps: the integrated multifunctional control software at least comprises a real-time sensor data display and curve display and state indication module, an equipment parameter setting module, a process parameter setting module, a historical data query and export module and the like;
3) the module of the real-time sensor data display, curve display and state indication interface comprises: the real-time data display unit of the control instrument and the alarm instrument, and the alarm temperature value display and alarm lamp indicating unit of the alarm instrument; the display unit is used for displaying data such as the total number of sections, the current control time of the section, the current control temperature of the section, the real-time temperature of the section, the heat preservation timing of the section and the like; wherein, when carrying out control instrument operating condition instruction and showing, specifically include: displaying an ascending section, a platform section and a descending section; in the module of the real-time sensor data display, curve display and state indication interface, the real-time sensor curve display is realized by adopting an XY curve control, and comprises the steps of setting temperature curve display and tracking display of the real-time temperature curve to the setting temperature curve;
4) the device parameter setting module includes:
the device comprises a basic function setting unit limited by equipment, a limited parameter setting unit applied to intelligent curve control and a control algorithm parameter limited setting unit;
the basic function setting unit limited by the equipment comprises a curve quantity setting unit, a curve execution time setting unit, a starting mode setting unit, a time unit setting unit, a temperature upper limit and lower limit setting unit and the like; the limiting parameter setting unit applied to intelligent curve control comprises: the device comprises a temperature target value customization control and program calculation target control value mode selection unit, a solid-state relay opening degree customization control and program calculation opening degree value control unit, a temperature target value customization control value setting unit and a solid-state relay opening degree customization control value setting unit; the control algorithm parameter limiting and setting unit comprises a proportional band parameter setting unit, an integral time parameter setting unit, a differential time parameter setting unit, a manual integral initial value setting unit, an action sensitivity setting unit, an output value upper limit value and an output value lower limit value setting unit and the like;
5) the process parameter setting module comprises: a temperature segment number setting unit, an initial temperature setting unit, a target temperature setting unit of each step and a parameter setting unit of process time of each step;
6) the historical data query and derivation module comprises: the device comprises a query time curve setting unit, a time interval setting unit, a query data display chart unit, a query chart clearing unit, a chart data derivation unit and the like.
The invention also discloses the temperature control algorithm embedded in the temperature control instrument, which specifically comprises the following steps:
the temperature control algorithm specifically has four control algorithms of realizing a target temperature direct control function, a control algorithm calculation temperature control process function, a set solid-state relay duty ratio control function and a control algorithm calculation solid-state relay duty ratio control function, and can realize different control purposes, and the temperature control algorithm specifically comprises the following steps:
1) the control method for realizing the direct control function of the target temperature comprises the following steps: the fixed temperature is used as the controlled target temperature, the duty ratio of the solid-state relay is calculated in real time through a control algorithm, and closed-loop control of the temperature is realized; the control method is characterized in that: only the target temperature is controlled, the process is not controlled, and the method can be used for rapid and high-precision control of the target temperature;
2) the control method for realizing the function of the control algorithm for calculating the temperature control process comprises the following steps: calculating the controlled target temperature in real time according to the heating or cooling termination target temperature and the process time, and calculating the duty ratio of the solid-state relay in real time through a control algorithm to realize temperature closed-loop control; the control method is characterized in that: the heating or cooling process is controlled, so that the high-precision control of the target temperature can be realized according to a set temperature curve;
the algorithm specifically adopted when the controlled target temperature is calculated in real time according to the heating or cooling termination target temperature and the process time is as follows:
wherein, Ts0Starting temperature value for the heating or cooling process, unit: c
TsaTarget temperature value for heating or cooling process, unit: c
tproControl time for heating or cooling process, unit: min
t is the elapsed time after the start of the self-heating or cooling process, unit: min
Ts(t) is the real-time target temperature of the heating or cooling process corresponding time, unit: DEG C;
3) the control method for realizing the duty ratio control function of the set solid-state relay comprises the following steps: after the heating or cooling process is started, setting the duty ratio of the solid-state relay according to experience, wherein the temperature control process is constant, realizing the duty ratio control of the solid-state relay, and automatically stopping the heating or cooling process after the target temperature is reached; the control method is characterized in that: in the control process, real-time temperature values do not need to be fed back, the heating or cooling process cannot be controlled according to a set temperature control curve, and the control process is an open-loop control process; the control method can only realize the lower-precision control process of the target temperature;
4) the control method for realizing the control function of calculating the duty ratio of the solid-state relay by the control algorithm comprises the following steps: the target temperature is used as the controlled temperature, and the controller calculates the duty ratio of the solid-state relay in real time to realize temperature closed-loop control; the control method is characterized in that: the duty ratio of the solid-state relay changes in real time in the control process, and the high-precision control of the target temperature can be realized.
Specifically, in the above technical solution, the control algorithm for calculating the duty ratio of the solid-state relay in real time is a proportional integral derivative algorithm with an integral initial value, and the specific calculation formula is as follows:
wherein:
u (t) is the controller output in units of: v;
u0is an integration initial value, and has the unit: v;
e (t) is the error value between the real-time set temperature and the real-time temperature, and the unit is: v;
Kpis a proportionality coefficient and has no dimension;
Tdis differential time, in units of: s;
Tiintegration time, unit is: and s.
The ratio of the output quantity of the controller to the full range of the solid-state relay determines the duty ratio of a controlled element, an integral initial value is used for feedforward inhibition of the large delay characteristic of a temperature control process, a proportional coefficient is used for controlling the rapidity of a temperature control algorithm, a differential time is used for inhibiting the oscillation performance of a controlled parameter, and an integral time is used for achieving the stability of the control algorithm.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a temperature control device applied to the field of liquid bath temperature treatment and a design method of a high-performance temperature control system thereof, which can meet the application requirements of laboratories or industrial scientific research and production on temperature treatment processes, and are particularly suitable for dangerous temperature treatment processes, high-precision temperature control processes, remote operation requirements, complex process parameters and recordable process requirements.
Drawings
FIG. 1 is a schematic diagram of the design principle of the intelligent control system of the liquid bath temperature control device of the present invention.
FIG. 2 is a functional design diagram of the integrated multi-function control software of the present invention.
FIG. 3 is a schematic view of the installation of a liquid bath temperature control device in an embodiment of the present invention.
Description of reference numerals: 1-heating element; 2-a cooling device; 3-temperature sensor; 4-cooling valve; 5-a circulation element; 6-circulating pump; 7-liquid level sensor.
Detailed Description
The invention will be further elucidated and described with reference to the embodiments of the invention described hereinafter.
Example (b):
as shown in fig. 1, an intelligent control system for a liquid bath temperature control device at least has the automatic power supply and power failure control functions of the liquid bath temperature control device realized by a relay-contactor loop, the heating start-stop control function realized by the duty ratio of a heating element controlled by a thyristor, and the cooling start-stop control function realized by the duty ratio of a cooling element controlled by the thyristor, so that the power utilization safety of equipment is controlled, and the temperature process control process is controlled.
Meanwhile, the control system is also provided with a double sensor and a double temperature measurement loop, and the two sensors are arranged in a temperature processing working area of the liquid bath temperature control device; one path of measuring sensor is used for temperature control, and the other path of sensor is used for temperature alarm; the layout of the two sensors is used for automatically judging whether the liquid bath temperature control device fails; when the temperature exceeds the preset value, the heating electric loop is cut off, and an operator is informed in an audible and visual alarm mode.
Preferably, the control system further has a liquid level measurement protection function, and the heating and cooling electric loop is cut off after the liquid level is lower than the lower limit, and an operator is informed of the liquid level measurement protection function in an audible and visual alarm mode.
Specifically, the temperature control process of the control system takes a temperature control instrument as a core controller, and a temperature control algorithm is embedded in the temperature control instrument; the real-time temperature value is connected into the temperature control instrument through the temperature control system, the output value of the solid-state relay is calculated through a temperature control algorithm embedded in the temperature control instrument and is output to the solid-state relay, and the alarm instrument is used as a core controller in the temperature alarm process.
Meanwhile, the control system controls the power of the heating element by adopting the duty ratio of the solid-state relay to realize the control of the heating process, and controls the on-off time of the cooling element by adopting the duty ratio of the solid-state relay to realize the control of the cooling process; the duty ratio control of the solid-state relay is realized by adopting a temperature control instrument.
Specifically, the temperature control algorithm embedded in the temperature control instrument specifically has four control algorithms, namely a function of directly controlling a target temperature, a function of calculating a temperature control process by using a control algorithm, a function of setting a duty ratio control function of the solid-state relay, and a function of calculating the duty ratio control function of the solid-state relay by using the control algorithm, and can achieve different control purposes, specifically as follows:
1) the control method for realizing the direct control function of the target temperature comprises the following steps: the fixed temperature is used as the controlled target temperature, the duty ratio of the solid-state relay is calculated in real time through a control algorithm, and closed-loop control of the temperature is realized; the control method is characterized in that: only the target temperature is controlled, the process is not controlled, and the method can be used for rapid and high-precision control of the target temperature;
2) the control method for realizing the function of the control algorithm for calculating the temperature control process comprises the following steps: calculating the controlled target temperature in real time according to the heating or cooling termination target temperature and the process time, and calculating the duty ratio of the solid-state relay in real time through a control algorithm to realize temperature closed-loop control; the control method is characterized in that: the heating or cooling process is controlled, so that the high-precision control of the target temperature can be realized according to a set temperature curve;
the algorithm specifically adopted when the controlled target temperature is calculated in real time according to the heating or cooling termination target temperature and the process time is as follows:
wherein, Ts0Starting temperature value for the heating or cooling process, unit: c
TsaTarget temperature value for heating or cooling process, unit: c
tproControl time for heating or cooling process, unit: min
t is the elapsed time after the start of the self-heating or cooling process, unit: min
Ts(t) is the real-time target temperature of the heating or cooling process corresponding time, unit: DEG C;
3) the control method for realizing the duty ratio control function of the set solid-state relay comprises the following steps: after the heating or cooling process is started, setting the duty ratio of the solid-state relay according to experience, wherein the temperature control process is constant, realizing the duty ratio control of the solid-state relay, and automatically stopping the heating or cooling process after the target temperature is reached; the control method is characterized in that: in the control process, real-time temperature values do not need to be fed back, the heating or cooling process cannot be controlled according to a set temperature control curve, and the control process is an open-loop control process; the control method can only realize the lower-precision control process of the target temperature;
4) the control method for realizing the control function of calculating the duty ratio of the solid-state relay by the control algorithm comprises the following steps: the target temperature is used as the controlled temperature, and the controller calculates the duty ratio of the solid-state relay in real time to realize temperature closed-loop control; the control method is characterized in that: the duty ratio of the solid-state relay changes in real time in the control process, and the high-precision control of the target temperature can be realized.
Specifically, in the above technical solution, the control algorithm for calculating the duty ratio of the solid-state relay in real time is a proportional integral derivative algorithm with an integral initial value, and the specific calculation formula is as follows:
wherein:
u (t) is the controller output in units of: v;
u0is an integration initial value, and has the unit: v;
e (t) is the error value between the real-time set temperature and the real-time temperature, and the unit is: v;
Kpis a proportionality coefficient and has no dimension;
Tdis differential time, in units of: s;
Tiintegration time, unit is: and s.
The ratio of the output quantity of the controller to the full range of the solid-state relay determines the duty ratio of a controlled element, an integral initial value is used for feedforward inhibition of the large delay characteristic of a temperature control process, a proportional coefficient is used for controlling the rapidity of a temperature control algorithm, a differential time is used for inhibiting the oscillation performance of a controlled parameter, and an integral time is used for achieving the stability of the control algorithm.
In this embodiment, this control system possesses the control computer, and the computer operation integrates multi-functional control software, and the control computer passes through serial ports communication interface with the temperature control instrument, adopts the Modbus communication protocol to realize the communication.
Meanwhile, the embodiment also discloses a design method of the integrated multifunctional control software, which specifically includes, as shown in fig. 2:
1) the communication function realization method of the integrated multifunctional control software and the temperature control system comprises the following steps: the temperature control instrument and the alarm instrument are both provided with serial port communication interfaces, adopt a standard communication protocol and provide an SDK (Software development Kit) file; the integrated multifunctional control software is provided with a communication driving interface and a protocol of the intelligent instrument, and the access and control of variables (including logic control switch variables, analog data variables and the like) of the intelligent control instrument on the integrated multifunctional control software can be realized through the SDK file;
2) the integrated multifunctional control software implementation method comprises the following steps: the integrated multifunctional control software at least comprises a real-time sensor data display and curve display and state indication module, an equipment parameter setting module, a process parameter setting module, a historical data query and export module and the like;
3) the module of the real-time sensor data display, curve display and state indication interface comprises: the real-time data display unit of the control instrument and the alarm instrument, and the alarm temperature value display and alarm lamp indicating unit of the alarm instrument; the display unit is used for displaying data such as the total number of sections, the current control time of the section, the current control temperature of the section, the real-time temperature of the section, the heat preservation timing of the section and the like; wherein, when carrying out control instrument operating condition instruction and showing, specifically include: displaying an ascending section, a platform section and a descending section; in the module of the real-time sensor data display, curve display and state indication interface, the real-time sensor curve display is realized by adopting an XY curve control, and comprises the steps of setting temperature curve display and tracking display of the real-time temperature curve to the setting temperature curve;
4) the device parameter setting module includes:
the device comprises a basic function setting unit limited by equipment, a limited parameter setting unit applied to intelligent curve control and a control algorithm parameter limited setting unit;
the basic function setting unit limited by the equipment comprises a curve quantity setting unit, a curve execution time setting unit, a starting mode setting unit, a time unit setting unit, a temperature upper limit and lower limit setting unit and the like; the limiting parameter setting unit applied to intelligent curve control comprises: the device comprises a temperature target value customization control and program calculation target control value mode selection unit, a solid-state relay opening degree customization control and program calculation opening degree value control unit, a temperature target value customization control value setting unit and a solid-state relay opening degree customization control value setting unit; the control algorithm parameter limiting and setting unit comprises a proportional band parameter setting unit, an integral time parameter setting unit, a differential time parameter setting unit, a manual integral initial value setting unit, an action sensitivity setting unit, an output value upper limit value and an output value lower limit value setting unit and the like;
5) the process parameter setting module comprises: a temperature segment number setting unit, an initial temperature setting unit, a target temperature setting unit of each step and a parameter setting unit of process time of each step;
6) the historical data query and derivation module comprises: the device comprises a query time curve setting unit, a time interval setting unit, a query data display chart unit, a query chart clearing unit, a chart data derivation unit and the like.
The embodiment also discloses a structural design of the liquid bath temperature control device, which specifically comprises:
the liquid bath device adopts medium oil, water or other liquid media to realize the heating or cooling temperature process; specifically, the liquid medium should be made of non-evaporation type or small amount of evaporation type material as much as possible;
the liquid bath temperature control device at least comprises a heating element, a cooling device and a liquid bath internal circulation element; heating element, cooling device, medium circulation part are through reasonable overall arrangement to realize realizing fast the invariable temperature of liquid bath work area, wherein, heating element satisfies liquid bath temperature control device's the fastest speed of rise in temperature control demand, and cooling device needs satisfy liquid bath temperature control device's the fastest speed of fall in temperature control demand.
As shown in fig. 3, both sides wall at liquid bath temperature groove all is provided with heating element 1, cooling device 2 simultaneously to the realization is from both sides heating or cooling to liquid medium simultaneously, installs cooling valve 4 on cooling element's the control end, and medium circulation part specifically includes circulating element 5, circulating pump 6, and circulating pump 6 control circulating element 5 circulation rotation, and circulating element locates the middle part at liquid bath temperature groove tank bottom, thereby the liquid medium of intensive mixing heated or cooling.
Meanwhile, the liquid bath internal circulation element is matched with the heating speed of the heating element and the cooling speed of the cooling device so as to reduce the delay time characteristic of the temperature control system as much as possible; the circulating element in the liquid bath always operates in the operating process of the heating element and the cooling device, so that the temperature of the liquid bath is homogenized in the designed delay time.
The temperature sensor 3 of the intelligent control system of the liquid bath temperature control device adopts a flexible arrangement mode in the liquid bath temperature control device, and can be specifically arranged at the edge position of a temperature processing area, so that the sensor can be prevented from interfering the temperature processing working area, and the temperature of a liquid bath temperature groove can be accurately reflected;
meanwhile, a liquid level sensor 7 is further arranged in the liquid bath temperature control device, so that incomplete equipment functions or safety accidents caused by liquid level reduction are prevented.
The technical scheme of the invention is practically applied, according to the technical scheme of the invention, a set of energy-containing composite material internal stress slow release device is designed, particularly, the functions of automatic process parameter setting, remote operation and real-time monitoring in the operation process, automatic storage, derivation, management and control of process data and the like of heating and cooling are realized by using integrated multifunctional computer control software of the invention, and the intelligent control algorithm of the invention is used for realizing linear control of the oil bath temperature in the heating and cooling process according to a set curve, the control precision can reach +/-0.05 ℃, the speed of the heating and cooling process covers +/-0.1 ℃ to +/-1 ℃, and the real high-precision temperature curve control can be realized. The device is successfully applied to the process of slowly releasing the internal stress of the energy-containing composite material, the strength level of the energy-containing composite material is improved, and a good application effect is achieved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (5)
1. The intelligent control system of the liquid bath temperature control device is characterized in that a temperature control instrument is used as a core control component in the temperature control process of the intelligent control system of the liquid bath temperature control device, a temperature curve high-precision control algorithm is developed based on the temperature control instrument, the intelligent control system is provided with double sensors and double temperature measurement loops, one sensor is used for temperature measurement, and the other sensor is used for temperature alarm; the real-time temperature value of the liquid bath is connected into a temperature control instrument through a temperature sensor, the output value of a solid-state relay is calculated through a temperature curve high-precision control algorithm of the temperature control instrument and is output to the solid-state relay, and the duty ratio of the solid-state relay is adopted to control the power of a heating element to realize the control of the heating process; controlling the on-off time of the cooling element by controlling the duty ratio of the solid-state relay to realize the control of the cooling process; the duty ratio control of the solid-state relay is realized by adopting a temperature control instrument;
the automatic control of power supply and power failure of the liquid bath temperature control device is realized through a solid-state relay-sensor loop, the heating start-stop control is realized through the duty ratio of a heating element controlled by a silicon controlled element, and the cooling start-stop control is realized through the duty ratio of a cooling element controlled by the silicon controlled element; in the temperature alarming process, an alarm instrument is used as a core controller, when the temperature returned by a sensor for temperature alarming is higher than a preset value, a heating electric loop is cut off, and an operator is informed in an audible and visual alarming mode;
the intelligent control system of the liquid bath temperature control device is also provided with a control computer, the control computer runs integrated multifunctional control software, the control computer is communicated with the temperature control instrument through a serial port, and an interface of the control computer is communicated by adopting a Modbus communication protocol;
the integrated multifunctional control software at least comprises a real-time sensor data display and curve display and state indication module, an equipment parameter setting module, a process parameter setting module and a historical data query and derivation module;
the real-time sensor data display and curve display and state indication module comprises: the real-time data display unit of the temperature control instrument and the alarm instrument, and the alarm temperature value display and alarm lamp indicating unit of the alarm instrument; a total number of sections, a current section control time, a current section control temperature, a current section real-time temperature and a current section heat preservation timing display unit of the temperature control instrument; a temperature control instrument working state indicating unit;
the device parameter setting module includes: the device comprises a basic function setting unit defined by the equipment and a defined parameter setting unit applied to intelligent curve control;
the basic function setting unit limited by the equipment comprises a curve quantity setting unit, a curve execution time setting unit, a starting mode setting unit, a time unit setting unit and a temperature upper limit and lower limit setting unit;
the limiting parameter setting unit applied to intelligent curve control comprises: the device comprises a temperature target value customization control and program calculation target control value mode selection unit, a solid-state relay opening degree customization control and program calculation opening degree value control unit, a temperature target value customization control value setting unit and a solid-state relay opening degree customization control value setting unit;
the process parameter setting module comprises: a temperature segment number setting unit, an initial temperature setting unit, a target temperature setting unit of each step and a parameter setting unit of process time of each step;
the historical data query and derivation module comprises: the query device comprises a query time curve setting unit, a time interval setting unit, a query data display chart unit, a query chart clearing unit and a chart data derivation unit;
the high-precision control algorithm for developing the temperature curve based on the temperature control instrument comprises the following steps: the control method comprises a control method for realizing a direct control function of target temperature, a control method for realizing a control algorithm calculation temperature control process function, a control method for realizing a set solid-state relay duty ratio control function and a control method for realizing a control algorithm calculation solid-state relay duty ratio control function;
the control method for realizing the direct control function of the target temperature takes the fixed temperature as the controlled target temperature, and calculates the duty ratio of the solid-state relay in real time through a control algorithm to realize the closed-loop control of the temperature;
the control method for realizing the function of the control algorithm in calculating the temperature control process comprises the following steps: calculating the controlled target temperature in real time according to the heating or cooling termination target temperature and the process time, and calculating the duty ratio of the solid-state relay in real time through a control algorithm to realize temperature closed-loop control;
the algorithm specifically adopted when the controlled target temperature is calculated in real time according to the heating or cooling termination target temperature and the process time is as follows:
wherein the content of the first and second substances,
starting temperature value for the heating or cooling process, unit: DEG C;
target temperature value for heating or cooling process, unit: DEG C;
control time for heating or cooling process, unit: min;
elapsed time after the start of the self-heating or cooling process, unit: min;
real-time target temperature for the corresponding time of the heating or cooling process, unit: DEG C;
the control method for realizing the control function of setting the duty ratio of the solid-state relay comprises the following steps: after the heating or cooling process is started, setting the duty ratio of the solid-state relay according to experience, wherein the temperature control process is constant, realizing the duty ratio control of the solid-state relay, and automatically stopping the heating or cooling process after the target temperature is reached;
the control method for realizing the control function of calculating the duty ratio of the solid-state relay by the control algorithm is characterized in that the target temperature is used as the controlled temperature, and the temperature control instrument calculates the duty ratio of the solid-state relay in real time to realize temperature closed-loop control;
in the four methods, the control algorithm for calculating the duty ratio of the solid-state relay in real time is a proportional integral derivative algorithm with an integral initial value, and the specific calculation formula is as follows:
wherein:
the ratio of the output quantity of the temperature control instrument to the full range of the solid-state relay determines the duty ratio of the solid-state relay, the initial value of the integral is used for feedforward inhibition of the large delay characteristic of the temperature control process, the proportional coefficient is used for controlling the rapidity of the temperature control algorithm, the differential time is used for inhibiting the oscillation performance of the controlled parameter, and the integral time is used for achieving the stability of the control algorithm.
2. The intelligent control system of a liquid bath temperature control device according to claim 1, further comprising a liquid level measurement protection function realized by a liquid level sensor, wherein the liquid level sensor is used for connecting the liquid level of the liquid bath to the temperature control instrument in real time, and cutting off the heating electric loop and the cooling electric loop when the liquid level is lower than a preset liquid level lower limit, and informing an operator in an audible and visual alarm manner.
3. The intelligent control system of a liquid bath temperature control device according to claim 1, wherein the temperature control instrument and the alarm instrument are both provided with serial communication interfaces, and adopt a standard communication protocol and provide SDK files, and the integrated multifunctional control software is provided with communication driving interfaces and protocols of the temperature control instrument and the alarm instrument, and can realize access and control of variables on the software and variables of the temperature control instrument through the SDK files.
4. The intelligent control system of the liquid bath temperature control device according to claim 1, wherein the equipment parameter setting module further comprises a control algorithm parameter limit setting unit, and the control algorithm parameter limit setting unit comprises a proportional band parameter setting unit, an integral time parameter setting unit, a differential time parameter setting unit, a manual integral initial value setting unit, an action sensitivity setting unit, an output value upper limit value setting unit, and an output value lower limit value setting unit.
5. The intelligent control system of the liquid bath temperature control device according to claim 1, wherein the liquid bath temperature control device at least comprises a heating element, a cooling device and a liquid bath internal circulation element, the heating element can meet the control requirement of the liquid bath device for the fastest temperature rise speed, the cooling device can meet the control requirement of the liquid bath device for the fastest temperature drop speed, the liquid bath internal circulation element is matched with the heating speed of the heating element and the cooling speed of the cooling device, and the liquid bath internal circulation element is operated all the time during the operation of the heating element and the cooling device.
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