CN103568235A - Synchronous temperature control system for injection molding machine - Google Patents
Synchronous temperature control system for injection molding machine Download PDFInfo
- Publication number
- CN103568235A CN103568235A CN201310516725.1A CN201310516725A CN103568235A CN 103568235 A CN103568235 A CN 103568235A CN 201310516725 A CN201310516725 A CN 201310516725A CN 103568235 A CN103568235 A CN 103568235A
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- CN
- China
- Prior art keywords
- temperature
- control module
- control system
- module
- barrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
- B29C2945/76668—Injection unit barrel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76929—Controlling method
- B29C2945/76956—Proportional
- B29C2945/76966—Proportional and integral, i.e. Pl regulation
- B29C2945/76969—Proportional and integral, i.e. Pl regulation derivative and integral, i.e. PID regulation
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Control Of Temperature (AREA)
Abstract
The invention discloses a synchronous temperature control system for an injection molding machine. The synchronous temperature control system comprises a plurality of electric heaters positioned at corresponding sections of a material barrel and a plurality of corresponding temperature sensors; the system also comprises a multi-section material barrel temperature control module; the multi-section material barrel temperature control module comprises a synchronous temperature algorithm module and PID (Proportion Integration Differentiation) control modules with the same number as that of the sections of the material barrel and corresponding to sections of the material barrel; a temperature setting module and each temperature sensor are respectively connected with corresponding PID control modules through signal lines; each PID control module is connected with each electric heater through the synchronous temperature algorithm module by the signal lines. The temperature control system can accurately control the temperature of cooling water, shortens the forming period, solves the problems of deformation, sinking and the like, and improves the quality and strength of products.
Description
Technical field
The present invention relates to a kind of temperature control system, be specifically related to a kind of injection machine temperature synchronous control system.
Background technology
Along with social development, plastics are as novel synthetic material, and with concrete, iron and steel, timber is also called four large industrial materials.Plastics only have many good characteristics, as light and handy in quality, water-fast, resistance to chemical attack, plastic products good looking appearance, be convenient to processing and install, there is excellent electrical characteristic and chemical stability, good shock-absorbing and noise elimination buffer action, can be well mutually cementing etc. with metal, glass, timber and other material.Just because of plastics, thering is plurality of advantages, be widely used in each department of national economy and daily life. plastics shared ratio in material structure rises year by year.
Injection moulding is one of main method of processing plastic goods, this method can make complex contour, size accurately and with the goods of metal insert, strong adaptability to various Polymer Processing, is easy to realize full-automatic production, therefore in plastics machinery, occupies very large proportion.The quality of injecting products is subject to the impact of macromolecular material, mould, injection machine and four aspects of Shooting Technique.In the situation that the macromolecular material of injection moulding, mould and Shooting Technique are certain, the quality of injecting products is directly determined by the process parameter control precision of injection machine.The speed that the technological parameter of injection moulding comprises each injection moulding action, pressure, inject time, injection position, cool time, barrel temperature, nozzle temperature, mold temperature etc.
The most important process conditions of injection mo(u)lding are that impact plasticizing is flowed and cooling temperature, injection speed, pressure and injection volume etc.Wherein to control be one of pass key control technological parameter in injection molding technique to the barrel temperature of injection machine, and melt temperature directly has influence on the characteristics such as the mobility of melt and specific volume, and then affect the quality of converted products.If barrel temperature is too low, plastics produce unnecessary shearing force between screw rod, and therefore produce cold curing, and machine is caused to damage.During excess Temperature, between plastic molecules, there is to be cross-linked ，Hui Shi tissue looseness, produce foamed phenomenon, especially unallowed especially in precise injection molding.Therefore the temperature of injection machine fused mass need to accurately be controlled.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of molding machine temperature control system, and this temperature control system can significantly improve control accuracy and stability.
A kind of injection machine temperature synchronous control system of the present invention, comprises and is positioned at some electric heaters at each fragment position place of barrel and corresponding some temperature sensors, this system also comprises multistage barrel temperature control module; Multistage barrel temperature control module comprises: temperature synchronized algorithm module and the pid control module corresponding to every section barrel identical with barrel hop count; Temperature Setting module, aforementioned each temperature sensor are connected to respectively corresponding pid control module by holding wire; Each pid control module is connected to aforementioned each electric heater by holding wire through temperature synchronized algorithm module.
In order to realize the accurate sampling to temperature signal, above-mentioned control module adopts 24 bit AD sample chips to sample to the data of thermocouple.
Described control module is communicated and is connected by CAN bus with host computer.
Described control module is provided with modulate circuit, described modulate circuit for the voltage signal of removing described thermocouple with interference.
Described control module is provided with electrostatic discharge protective circuit, is used for preventing the chip in control module described in electrostatic breakdown.
Temperature controlled processes of the present invention comprises the following steps: each section of barrel current actual temperature value of temperature sensor Real-time Collection, is sent to corresponding pid control module; The built-in calculation procedure of each pid control module, first obtains the temperature departure value of each section of barrel according to formula; Each pid control module calculates the original control output valve of corresponding section barrel electric heater according to formula; The built-in calculation procedure of temperature synchronized algorithm module, obtains the control output valve of each section of barrel electric heater reality according to formula.
Compared with prior art, the invention has the beneficial effects as follows: the Fast synchronization that uses this synchronization control algorithm can realize multistage barrel temperature heats up and controls, in injection machine normal course of operation, when injecting machine material tube temperature error surpasses specification error scope, also can expect can synchronization control algorithm, and the dynamic synchronization realizing in injection moulding production process is controlled.Adopt this control system and method not to change the hardware cost of original control system, greatly improved the synchronism that barrel temperature is controlled.Temperature control system of the present invention can be controlled the temperature of cooling water exactly, shortens molding cycle, and the problem such as solve distortion, sink is avoided tired gas phenomenon, improves the quality of products and intensity.
The specific embodiment
A temperature synchronous control system, comprises and is positioned at some electric heaters at each fragment position place of barrel and corresponding some temperature sensors, this system also comprises multistage barrel temperature control module; Multistage barrel temperature control module comprises: temperature synchronized algorithm module and the pid control module corresponding to every section barrel identical with barrel hop count; Temperature Setting module, aforementioned each temperature sensor are connected to respectively corresponding pid control module by holding wire; Each pid control module is connected to aforementioned each electric heater by holding wire through temperature synchronized algorithm module.
Described control module adopts 24 bit AD sample chips to sample to the data of thermocouple.Described control module is communicated and is connected by CAN bus with host computer.
Described control module is provided with modulate circuit, described modulate circuit for the voltage signal of removing described thermocouple with interference.
Described control module is provided with electrostatic discharge protective circuit, is used for preventing the chip in control module described in electrostatic breakdown.
Use thermocouple to carry out temperature acquisition and be then passed to pid control module, the signal of Temperature Setting module is also sent to pid control module, all each PID modules are sent to temperature synchronized algorithm module after obtaining and controlling output, after temperature synchronized algorithm module, every section of electric heater that barrel is corresponding is controlled in output, finally realizes the control of multistage barrel temperature.In order to realize the accurate sampling to temperature signal, control module can adopt 24 bit AD sample chips accurately to sample to temperature.Thermocouple voltages signal is differential signal; in order to realize accurate sampling, voltage signal need to be biased to sample range; the electrostatic protection of complicated industrial environment down-sampling end also seems especially important; therefore control module be provided with voltage signal for removing described thermocouple with interference modulate circuit, be used for preventing the electrostatic discharge protective circuit of the chip in control module described in electrostatic breakdown and be used for gathering cold junction temperature, the thermocouple value sampling is carried out to the temperature sensor of cold junction compensation.This temperature sensor is converted to cold junction voltage by the cold junction temperature of measurement, compensates on sampled voltage, by after sampled voltage and bucking voltage addition, obtains the hot junction voltage of thermocouple, according to thermocouple indexing table, can be hot-side temperature by hot junction voltage transitions.Utilize setting value and sampled value computing, produce switch time, being system subtracts each other the temperature sampling and target setting temperature to obtain temperature deviation, and utilizes pid algorithm that temperature deviation is converted to heating wire switch time, realizes the precise and stable control to barrel temperature.
Claims (5)
1. an injection machine temperature synchronous control system, comprises and is positioned at some electric heaters at each fragment position place of barrel and corresponding some temperature sensors, it is characterized in that: described control system also comprises multistage barrel temperature control module; Multistage barrel temperature control module comprises: temperature synchronized algorithm module and the pid control module corresponding to every section barrel identical with barrel hop count; Temperature Setting module, aforementioned each temperature sensor are connected to respectively corresponding pid control module by holding wire; Each pid control module is connected to aforementioned each electric heater by holding wire through temperature synchronized algorithm module.
2. a kind of injection machine temperature synchronous control system according to claim 1, is characterized in that: described control module adopts 24 bit AD sample chips to sample to the data of thermocouple.
3. a kind of injection machine temperature synchronous control system according to claim 1, is characterized in that: described control module is communicated and is connected by CAN bus with host computer.
4. a kind of injection machine temperature synchronous control system according to claim 1, is characterized in that: described control module is provided with modulate circuit, described modulate circuit for the voltage signal of removing described thermocouple with interference.
5. a kind of injection machine temperature synchronous control system according to claim 1, is characterized in that: described control module is provided with electrostatic discharge protective circuit, is used for preventing the chip in control module described in electrostatic breakdown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310516725.1A CN103568235A (en) | 2013-10-25 | 2013-10-25 | Synchronous temperature control system for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310516725.1A CN103568235A (en) | 2013-10-25 | 2013-10-25 | Synchronous temperature control system for injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103568235A true CN103568235A (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310516725.1A Pending CN103568235A (en) | 2013-10-25 | 2013-10-25 | Synchronous temperature control system for injection molding machine |
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| CN (1) | CN103568235A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105108988A (en) * | 2015-09-11 | 2015-12-02 | 安徽爱信自动化机械有限公司 | Method for controlling temperature of stuff canister of injection molding machine |
| CN105108989A (en) * | 2015-09-11 | 2015-12-02 | 安徽爱信自动化机械有限公司 | Charging barrel temperature control method with warning function for injection molding machine |
| CN113211750A (en) * | 2021-04-25 | 2021-08-06 | 广东工业大学 | Udf and numerical simulation-based temperature control method for metering section of charging barrel of injection molding machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102398356A (en) * | 2011-12-06 | 2012-04-04 | 浙江大学 | Temperature control method and system for a plurality of sections of barrel of injection molding machine |
| CN102501358A (en) * | 2011-10-21 | 2012-06-20 | 宁波安信数控技术有限公司 | Heating control system of injection molding machine |
-
2013
- 2013-10-25 CN CN201310516725.1A patent/CN103568235A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102501358A (en) * | 2011-10-21 | 2012-06-20 | 宁波安信数控技术有限公司 | Heating control system of injection molding machine |
| CN102398356A (en) * | 2011-12-06 | 2012-04-04 | 浙江大学 | Temperature control method and system for a plurality of sections of barrel of injection molding machine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105108988A (en) * | 2015-09-11 | 2015-12-02 | 安徽爱信自动化机械有限公司 | Method for controlling temperature of stuff canister of injection molding machine |
| CN105108989A (en) * | 2015-09-11 | 2015-12-02 | 安徽爱信自动化机械有限公司 | Charging barrel temperature control method with warning function for injection molding machine |
| CN113211750A (en) * | 2021-04-25 | 2021-08-06 | 广东工业大学 | Udf and numerical simulation-based temperature control method for metering section of charging barrel of injection molding machine |
| CN113211750B (en) * | 2021-04-25 | 2023-02-17 | 广东工业大学 | Injection molding machine charging barrel metering section temperature control method based on udf and numerical simulation |
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Application publication date: 20140212 |