CN102601987A - Temperature control method and system of air-pressure thermoforming machine - Google Patents
Temperature control method and system of air-pressure thermoforming machine Download PDFInfo
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- CN102601987A CN102601987A CN2012100718304A CN201210071830A CN102601987A CN 102601987 A CN102601987 A CN 102601987A CN 2012100718304 A CN2012100718304 A CN 2012100718304A CN 201210071830 A CN201210071830 A CN 201210071830A CN 102601987 A CN102601987 A CN 102601987A
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Abstract
The invention relates to a temperature control method and system of an air-pressure thermoforming machine. According to the invention, a heated area is refined to a plurality of temperature areas, a real-time temperature close to a sheet position in each temperature area is acquired, and the overall output power of all heating units in the temperature areas is controlled by a fuzzy PID (Proportion Integration Differentiation) control method according to the temperatures, so that the temperature change in each temperature area is controlled conveniently, quickly and accurately, the temperature of the sheet is controlled more accurately, the forming effect is improved, the yield of products is enhanced, and the control structure is simplified.
Description
Technical field
The present invention relates to a kind of temperature control method and temperature control system, relate in particular to a kind of temperature control method of pneumatic thermoforming machine, and based on the temperature control system of this temperature control method.
Background technology
Pneumatic thermoforming machine is a kind of plastics forming equipment that is used to make identical product; The thermoplastic plastic sheet is heated to softening; Under the gas pressure effect, adopt suitable mold to make it become goods, simultaneously can be according to certain procedure duplication of production circulation.The temperature control system of pneumatic thermoforming machine is the key component of pneumatic thermoforming machine work, directly affects the effect of pneumatic thermoforming machine moulding.At present, the temperature control system of pneumatic thermoforming machine generally all is the central temperature of gathering the heating tile, and adopts complicated control system to carry out temperature control according to the central temperature of heating tile.Like this; Differ greatly from heating tile temperature of gather and the temperature that is heated sheet material, and the variation that is heated sheet temperature can not in time be reflected on the temperature of gathering, have tangible hysteresis quality; Affect the effect of pneumatic thermoforming machine moulding, product percent of pass reduces.
Summary of the invention
The technical problem that the present invention will solve provides a kind of temperature control method of pneumatic thermoforming machine; And, make that the temperature control of thermoforming machine is simpler, and temperature control precision increases substantially based on the temperature control system of this temperature control method; Improve the effect of moulding, improve the qualification rate of product.The technical scheme that adopts is following:
A kind of temperature control method of pneumatic thermoforming machine is characterized in that comprising the steps:
(1), along the throughput direction of sheet material, the heating region on the thermoforming machine is divided at least two warm areas, be provided with also few a pair of heating unit in each warm area;
(2), in each warm area, choose a detection position, the real time temperature of acquisition testing position respectively near sheet material;
(3), require temperature to compare the real time temperature of each warm area and sheet material, draw the temperature departure value of each warm area, control the overall power output of all heating units in the corresponding warm area then through the temperature departure value of each warm area respectively.
Above-mentioned a pair of heating unit is provided with one on the other mode on thermoforming machine usually, and sheet material then is from passing through between two heating units one on the other, the equal thermal radiation of the upper surface of sheet material and lower surface and be heated to temperature requirement; Above-mentioned heating unit generally adopts the heating tile.
Because the heating region bigger (along the sheet material throughput direction, heating region is longer) of thermoforming machine, the heater element in the above and below of sheet material was an integral body in the past; Sheet material is when the heating region, and the each point temperature on the sheet material is also inequality, and the temperature of surveying arbitrarily any all can't accurately be represented the temperature of sheet material; Therefore be difficult to reach control accurately, among the present invention, through the heating region on the thermoforming machine is divided at least two warm areas; Promptly be that heating region is carried out refinement, and heating unit is set respectively, the warm area of division is many more; Gather the real time temperature of each warm area, just can locate the actual temperature of sheet material more near this, therefore through heating region being divided into a plurality of warm areas; Improve temperature controlled precision, improved the effect of moulding, improved the qualification rate of product; Temperature through acquisition testing position (near the sheet material position); The temperature of this detection position is lower than the temperature on the heating unit; More near the actual temperature of sheet material; Therefore to control temperature more accurate for the temperature of acquisition testing position (near the sheet material position), improves the effect of moulding equally, improves the qualification rate of product; Because it is many more that heating region is divided warm area, its control difficulty is high more, therefore; Under the situation that the suitable quantity warm area is set, in warm area, be provided with manyly to heating unit, control the overall power output of all heating units in this warm area; To adjust the temperature of this warm area; Both reached the purpose of accurate control temperature, it is complicated to avoid warm area too much to control again, reaches the purpose of simplifying control.
As preferred version of the present invention, it is characterized in that: in the said step (3), through the overall power output of each heating unit in the fuzzy PID control method control warm area.Fuzzy PID control method promptly is according to three parameters of PID controller and the fuzzy relation of temperature departure value, continuous detected temperatures deviation value when operation; Through pre-determined relation; Utilize the method for fuzzy reasoning, the parameter of online modification PID controller lets the PID controller from adjusting.Fuzzy PID control method can have a better controlling to nonlinear problems such as temperature, fast convergence rate when the temperature departure value is big, and hour variations in temperature is stable in the temperature departure value.Fuzzy PID control method is adapted to the control of complicated temperature control systems such as big inertia, large time delay; Can be adapted to the control that the controlled system Mathematical Modeling is difficult to set up the temperature control system of, parameter time varying complicated with the controlled system process, have control accuracy height, interference resistance is strong, robustness is good characteristics.
A kind of temperature control system of pneumatic thermoforming machine; Comprise heater, at least two temperature detection devices and temperature control equipment; Heater all is connected with temperature control equipment with temperature detection device, it is characterized in that: said heater comprises a plurality of heating unit and a plurality of heating units down gone up; Throughput direction along sheet material; The heating region of pneumatic thermoforming machine is provided with at least two warm areas successively; Be provided with heating unit at least one, at least one following heating unit and a temperature detection device in each warm area, temperature detection device is located between heating unit and the following heating unit.
The general temperature sensor that adopts of said temperature sniffer can be preferably K type thermocouple probe, and it is good that K type thermocouple has the linearity; Thermo-electromotive force is bigger, and is highly sensitive, and stability and uniformity are better; Antioxygenic property is strong; Advantages such as low price can be used for the oxidisability inert atmosphere and extensively adopted by the user, and it can directly measure the surface temperature of the liquid vapour from 0 ℃ to 1300 ℃ of scopes and gas medium and solid in the various productions; The above-mentioned heating unit of going up generally adopts the heating tile with following heating unit.
Temperature detection device detects goes up near the real time temperature the sheet material between heating unit and the following heating unit in each warm area, and each real time temperature is uploaded to temperature control equipment, in temperature control equipment; Each real time temperature requires temperature to make comparisons with sheet material respectively; Draw the temperature departure value of each warm area, control the overall power output of all heating units in the corresponding warm area then respectively through the temperature departure value of each warm area, to adjust the temperature of this warm area; Make it more and more near the sheet temperature requirement; Both reached the purpose of accurate control temperature, it is complicated to avoid warm area too much to control again, reaches the purpose of simplifying control.
As preferred version of the present invention, it is characterized in that: said temperature control equipment comprises at least two temperature collect modules, main control module and at least two Executive Modules; Each temperature collect module all is connected with main control module with Executive Module; Each temperature collect module is connected with corresponding temperature detection device; Each Executive Module is with corresponding upward heating unit, heating unit is connected down.Temperature collect module receives the detected real time temperature of temperature detection device; Be converted into numerical value; In main control module, carry out computing through preset algorithm; Send instruction through Executive Module at last, heating unit is gone up in indication accordingly, heating unit increases or reduces power output down, thereby controls the overall power output of last heating units all in each warm area, following heating unit.
As the further preferred version of the present invention, it is characterized in that: said main control module is a fuzzy controller.Preferred fuzzy controller adopts FPGA as its main control chip.FPGA (Field-Programmable Gate Array); It is field programmable gate array; It occurs as a kind of semi-custom circuit in special IC (ASIC) field, has both solved the deficiency of custom circuit, has overcome the limited shortcoming of original programming device gate circuit number again.We can say that fpga chip is one of optimal selection of small lot system raising level of integrated system, reliability.The Spartan-3 XC3S200 that further preferred FPGA produces for Xilinx company.Spartan3 is that a kind of low-cost and high-performance logic in enormous quantities solves device, stresses low cost applications, and capacity is medium, and performance can satisfy general logical design requirement.The characteristics of Spartan-3 XC3S200 are high-performance, and dominant frequency can reach 50MHz, and high I/O quantity is up to 141 I/O ports.The I/O driving force is strong, up 36mA; Support nearly 24 kinds I/O standard (Spartan-3E supports 18 kinds); Support DCI (digital control impedance matching).Inside information and I/O port that these are abundant make Spartan-3 XC3S200 can realize the multidata parallel processing, and carry out certain logical operation, realize complicated control algolithm and various communication modes.In order to control more heating unit, the following heating unit gone up, also can preferably adopt the main control chip of two Spartan-3 XC3S200 whiles, the various information of parallel processing as fuzzy controller.
As the further preferred version of the present invention, it is characterized in that: said temperature collect module comprises temperature transmitter and A/D converter; The input of temperature transmitter is connected with temperature detection device, and the output of temperature transmitter is connected with the input of A/D converter, and the output of A/D converter is connected with the respective input of main control module.Temperature transmitter is preferably SBWR type K type temperature transmitter, and this temperature transmitter is a kind ofly to convert temperature variable the instrument of transmissible standardization output signal into, is input as 24V; Be output as 4～20mA, be mainly used in the measurement and the control of industrial process temperature parameter, it has the output signal zero and the full scale potentiometer is regulated; Conversion accuracy is high; Linearisation is proofreaied and correct, and volume is little, lightweight characteristics.A/D converter preferably adopts the MAX1280 chip; MAX1280 is that 12 ADC combines one 8 tunnels analogy input multiplexer; Have the sampling/maintenance of high bandwidth and the characteristics of high conversion speed, use low-power consumption serial line interface and FPGA to carry out communication, use simple and stable.
As the further preferred version of the present invention, it is characterized in that: said Executive Module comprises amplifier, two resistance and solid-state relay; The base stage of amplifier is connected with the corresponding output end of main control module through one of them resistance; The grounded emitter of amplifier; The colelctor electrode of amplifier is connected with an end of another resistance; The input of solid-state relay is connected with the colelctor electrode of amplifier, the output of solid-state amplifier with each on heating unit, down heating unit is connected.In control, the other end that connects the resistance of amplifier colelctor electrode connects the power supply of 24V, comes from the break-make of the control signal control 24V power supply of main control module, thereby realizes the break-make of solid-state relay.When the input control signal from main control module was 0V, solid-state relay was in conducting state, output 24V; When the input control signal from main control module is during greater than 0V, solid-state relay is in off-state, output 0V.Can adopt the 2N3904 element by further preferred amplifier.
The present invention compared with prior art has following advantage: through heating region being refined as a plurality of warm areas; Gather in each warm area real time temperature respectively near the sheet material position; And adopt the control method of fuzzy to control the overall power output of all heating units in each warm area according to this temperature; Fast, accurately control the variations in temperature of each warm area, thereby make the temperature of sheet material obtain controlling more accurately, improve the effect of moulding; Improve the qualification rate of product, simplified control structure simultaneously again.
Description of drawings
Fig. 1 is the schematic layout pattern of the preferred embodiment for the present invention;
Fig. 2 is the frame principle figure of the preferred embodiment for the present invention;
Fig. 3 is the schematic diagram of temperature collect module in the preferred embodiment for the present invention;
Fig. 4 is the schematic diagram of Executive Module in the preferred embodiment for the present invention.
The specific embodiment
Do further explanation below in conjunction with accompanying drawing and preferred implementation of the present invention.
The temperature control method of this pneumatic thermoforming machine comprises the steps:
(1), along the throughput direction of sheet material, the heating region on the thermoforming machine is divided into three warm areas, be provided with four pairs of heating units in each warm area;
(2), in each warm area, choose a detection position, the real time temperature of acquisition testing position respectively near sheet material;
(3), real time temperature and the sheet material with each warm area requires temperature to compare; Draw the temperature departure value of each warm area; Through the temperature departure value of each warm area, control the overall power output of all heating units in the corresponding warm area respectively through fuzzy PID control method then.
As depicted in figs. 1 and 2; Temperature control system based on this pneumatic thermoforming machine of the temperature control method of above-mentioned pneumatic thermoforming machine; Comprise heater 1, three K type thermocouple probes 2 and temperature control equipments 3, heater 1 all is connected with temperature control equipment 3 with K type thermocouple probe 2; Heater 1 comprises 12 last heating tiles 101 and 12 following heating tiles 102; Throughput direction along sheet material; The heating region of pneumatic thermoforming machine is provided with 3 warm areas successively; Be respectively first warm area 4, second warm area 5 and the three-temperature-zone 6; Be provided with four in each warm area and go up heating tile 101, four heating tile 102 and a K type thermocouple probe 2 down, K type thermocouple probe 2 is located at heating tile 101 and following position of heating between the tile 102 near sheet material.
Temperature control equipment 3 comprises three temperature collect modules 301, main control module 302 and three Executive Modules 303; Each temperature collect module 301 all is connected with main control module 302 with Executive Module 303; Each temperature collect module 301 is connected with corresponding K type thermocouple probe 2; Each Executive Module 303 with corresponding go up heating tile 101, heat tile 102 down and be connected.
Main control module 302 is a fuzzy controller, constitutes the main control chip of PID controller by a FPGA3021 and the 2nd FPGA3022, and a FPGA3021 and the 2nd FPGA3022 all adopt Spartan-3XC3S200.
As shown in Figure 3, temperature collect module 301 comprises temperature transmitter 3011 and A/D converter 3012; The input of temperature transmitter 3011 is connected with K type thermocouple probe 2, and the output of temperature transmitter 3011 is connected with the input of A/D converter 3012, and the output of A/D converter 3012 is connected with the respective input of main control module 302.
As shown in Figure 4, Executive Module 303 comprises amplifier 3031, first resistance 3032, second resistance 3033 and solid-state relay 3034; The base stage of amplifier 3031 is connected with the corresponding output end of main control module 302 through first resistance 3032; The grounded emitter of amplifier 3031; The colelctor electrode of amplifier 3031 is connected with an end of second resistance 3033; The input of solid-state relay 3034 is connected with the colelctor electrode of amplifier 3031, the output of solid-state amplifier 3034 with each on heating tile 101, heat tile 102 down and be connected.In control, the other end that connects the resistance of amplifier colelctor electrode connects the power supply of 24V, comes from the break-make of the control signal control 24V power supply of main control module, thereby realizes the break-make of solid-state relay.When the input control signal from main control module was 0V, solid-state relay was in conducting state, output 24V; When the input control signal from main control module is during greater than 0V, solid-state relay is in off-state, output 0V.Can adopt the 2N3904 element by further preferred amplifier.
The concrete temperature control process of the temperature control system of above-mentioned pneumatic thermoforming machine is following:
Temperature collect module 301 receives K type thermocouple probe 2 detected real time temperatures through temperature transmitter 3011; And be converted into numerical value through A/D converter 3012; In main control module, carry out computing through preset fuzzy algorithm; Send instruction (promptly being break-make) through each Executive Module 303 at last through amplifier 3031 control solid-state relays 3034; Indication is corresponding goes up heating tile 101, heat tile 102 down increases or reduces power output, allly in first warm area 4, second warm area 5 and the three-temperature-zone 6 goes up heating tile 101, heats the overall power output of tile 102 down thereby control respectively.
Claims (7)
1. the temperature control method of a pneumatic thermoforming machine is characterized in that comprising the steps:
(1), along the throughput direction of sheet material, the heating region on the thermoforming machine is divided at least two warm areas, be provided with also few a pair of heating unit in each warm area;
(2), in each warm area, choose a detection position, the real time temperature of acquisition testing position respectively near sheet material;
(3), require temperature to compare the real time temperature of each warm area and sheet material, draw the temperature departure value of each warm area, control the overall power output of all heating units in the corresponding warm area then through the temperature departure value of each warm area respectively.
2. temperature-controlled process as claimed in claim 1 is characterized in that: in the said step (3), through the overall power output of each heating unit in the fuzzy PID control method control warm area.
3. the temperature control system of a pneumatic thermoforming machine; Comprise heater, at least two temperature detection devices and temperature control equipment; Heater all is connected with temperature control equipment with temperature detection device, it is characterized in that: said heater comprises a plurality of heating unit and a plurality of heating units down gone up; Throughput direction along sheet material; The heating region of pneumatic thermoforming machine is provided with at least two warm areas successively; Be provided with heating unit at least one, at least one following heating unit and a temperature detection device in each warm area, temperature detection device is located between heating unit and the following heating unit.
4. temperature control system as claimed in claim 3 is characterized in that: said temperature control equipment comprises at least two temperature collect modules, main control module and at least two Executive Modules; Each temperature collect module all is connected with main control module with Executive Module; Each temperature collect module is connected with corresponding temperature detection device; Each Executive Module is with corresponding upward heating unit, heating unit is connected down.
5. temperature control system as claimed in claim 4 is characterized in that: said main control module is a fuzzy controller.
6. temperature control system as claimed in claim 4 is characterized in that: said temperature collect module comprises temperature transmitter and A/D converter; The input of temperature transmitter is connected with temperature detection device, and the output of temperature transmitter is connected with the input of A/D converter, and the output of A/D converter is connected with the respective input of main control module.
7. temperature control system as claimed in claim 4 is characterized in that: said Executive Module comprises amplifier, two resistance and solid-state relay; The base stage of amplifier is connected with the corresponding output end of main control module through one of them resistance; The grounded emitter of amplifier; The colelctor electrode of amplifier is connected with an end of another resistance; The input of solid-state relay is connected with the colelctor electrode of amplifier, the output of solid-state amplifier with each on heating unit, down heating unit is connected.
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| CN2012100718304A CN102601987A (en) | 2012-03-17 | 2012-03-17 | Temperature control method and system of air-pressure thermoforming machine |
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| CN2012100718304A CN102601987A (en) | 2012-03-17 | 2012-03-17 | Temperature control method and system of air-pressure thermoforming machine |
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| CN103240867A (en) * | 2013-05-06 | 2013-08-14 | 江苏大学 | Temperature detection and control system of hot forming mold |
| CN103358537A (en) * | 2013-07-19 | 2013-10-23 | 广东达诚机械有限公司 | Plastic sheet pneumatic thermoforming machine temperature acquisition control system and plastic sheet pneumatic thermoforming machine |
| CN104294020A (en) * | 2014-08-20 | 2015-01-21 | 江苏大学 | Heat stamping apparatus used for quenching control |
| CN106303893A (en) * | 2016-10-09 | 2017-01-04 | 苏州倍声声学技术有限公司 | The automatic hot apparatus former of moving-iron type receiver vibrating film |
| CN106273644A (en) * | 2016-09-23 | 2017-01-04 | 安徽鲲鹏装备模具制造有限公司 | A kind of timesharing method for heating and controlling of forming machine heating module |
| CN109358669A (en) * | 2018-11-15 | 2019-02-19 | 佛山市金银河智能装备股份有限公司 | A kind of automatic control system and method for temperature of charge |
| CN109391641A (en) * | 2017-08-03 | 2019-02-26 | 杭州海康威视数字技术股份有限公司 | Temperature information method for uploading, device, system, electronic equipment and storage medium |
| CN109822869A (en) * | 2019-02-20 | 2019-05-31 | 浙江省三门中力汽车用品有限公司 | A kind of car mat hot pressing production equipment |
| CN109863823A (en) * | 2016-10-17 | 2019-06-07 | 克劳斯玛菲科技有限公司 | Method and apparatus for manufacturing the molded part with semi-finished product |
| CN115071106A (en) * | 2022-06-06 | 2022-09-20 | 艾尔玛科技股份有限公司 | IMS high pressure make-up machine |
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| CN109863823B (en) * | 2016-10-17 | 2021-11-02 | 克劳斯玛菲科技有限公司 | Method and device for producing a molded part having a semifinished product |
| CN109391641A (en) * | 2017-08-03 | 2019-02-26 | 杭州海康威视数字技术股份有限公司 | Temperature information method for uploading, device, system, electronic equipment and storage medium |
| CN109358669A (en) * | 2018-11-15 | 2019-02-19 | 佛山市金银河智能装备股份有限公司 | A kind of automatic control system and method for temperature of charge |
| CN109358669B (en) * | 2018-11-15 | 2020-12-04 | 佛山市金银河智能装备股份有限公司 | Automatic control system and method for material temperature |
| CN109822869B (en) * | 2019-02-20 | 2021-04-20 | 浙江省三门中力汽车用品有限公司 | Automobile cushion hot-pressing production equipment |
| CN109822869A (en) * | 2019-02-20 | 2019-05-31 | 浙江省三门中力汽车用品有限公司 | A kind of car mat hot pressing production equipment |
| CN115071106A (en) * | 2022-06-06 | 2022-09-20 | 艾尔玛科技股份有限公司 | IMS high pressure make-up machine |
| CN115071106B (en) * | 2022-06-06 | 2023-09-26 | 艾尔玛科技股份有限公司 | IMS high-pressure forming machine |
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Application publication date: 20120725 |