CN114734603A - Temperature control system and method for injection molding machine and mold - Google Patents
Temperature control system and method for injection molding machine and mold Download PDFInfo
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- CN114734603A CN114734603A CN202210279528.1A CN202210279528A CN114734603A CN 114734603 A CN114734603 A CN 114734603A CN 202210279528 A CN202210279528 A CN 202210279528A CN 114734603 A CN114734603 A CN 114734603A
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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
- B29C2945/76672—Injection unit barrel barrel-chamber
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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
- B29C2945/76688—Injection unit nozzle
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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
- B29C2945/76732—Mould
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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
- B29C2945/76929—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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a temperature control system and a method of an injection molding machine and a mold, wherein the system comprises a primary temperature regulating part, a secondary temperature regulating part, a tertiary temperature regulating part, a mold temperature control module, an automatic control module, an alarm module, a PID control module and an operation terminal, the primary temperature regulating part is connected with the mold temperature control module, the secondary temperature regulating part is connected with the automatic control module, the tertiary temperature regulating part is connected with the PID control module, the automatic control module sets a temperature threshold value according to a filling material of the injection molding machine, the mold temperature control module, the automatic control module and the PID control module are respectively connected with the operation terminal, and the alarm module is connected with the tertiary temperature regulating part. The injection molding temperature control precision and the temperature feedback speed are improved in a mode of graded temperature regulation and PID temperature regulation, the switching loss of the electric heating coil in the temperature control process is reduced, and the electric power resource is saved.
Description
Technical Field
The invention relates to the field of intelligent production of injection molding machines, in particular to an injection molding machine and a temperature control system and method of a mold.
Background
Along with the development of science and technology, the requirements of plastic products in the fields of life, manufacturing, scientific research and the like are increased, the injection molding requirements of the plastic products are also increased, in order to obtain high-quality plastic products, when plastic raw materials are injected, the temperature of the plastic raw materials needs to be controlled, mainly the temperature in a cavity of an extruding machine and the temperature of a nozzle are controlled, but the conventional switch type temperature control instrument has a large temperature control fluctuation range and a large overshoot, so that the temperature is too low during injection molding, the nozzle is blocked, and the injection molding process is long; or the decomposition of the raw materials due to the excessive temperature.
Chinese patent CN 109664478A discloses a "method and system for controlling temperature of a charging barrel of an injection molding machine", which sets a first heating temperature, and if the injection molding machine does not start normal production within a first preset time after the temperature of the charging barrel of the injection molding machine reaches the first heating temperature, adjusts the charging barrel of the injection molding machine to a second heating temperature and keeps the second heating temperature; wherein the second heating temperature is lower than the first heating temperature. The temperature of the charging barrel of the injection molding machine is reduced when the injection molding machine is idle, so that a large amount of electric energy can be saved. However, the temperature of the injection molding machine cannot be accurately regulated and controlled, and the method can only be used for saving electric energy.
Disclosure of Invention
Aiming at the problem of poor temperature regulation and control accuracy of the injection molding machine, the invention provides a temperature control system and a temperature control method for the injection molding machine and a mold.
The technical problem of the invention is mainly solved by the following technical scheme: the control system comprises a primary temperature adjusting part, a secondary temperature adjusting part, a tertiary temperature adjusting part, a mold temperature control module, a self-control module, an alarm module, a PID control module and an operation terminal, wherein the primary temperature adjusting part is connected with the mold temperature control module, the secondary temperature adjusting part is connected with the self-control module, the tertiary temperature adjusting part is connected with the PID control module, the self-control module sets a temperature threshold value according to filling materials in an injection molding machine, the mold temperature control module, the self-control module and the PID control module are respectively connected with the operation terminal, and the alarm module is connected with the tertiary temperature adjusting part. The injection molding uses different materials and different required heating temperatures, and the energy consumption for adjusting the temperature by the traditional power supply on-off method is large and the efficiency is low.
Preferably, the primary temperature control part comprises a mold temperature adjusting device and a mold temperature sensing device, the mold temperature adjusting device is arranged on the mold, the mold temperature sensing device is arranged on the inner wall of the mold, and the mold temperature adjusting device and the mold temperature sensing device are respectively connected with the mold temperature control module. The temperature adjusting device comprises a cooling liquid pipeline and a pipeline control valve, and the temperature is adjusted and controlled by changing the flow speed of the cooling liquid.
Preferably, the secondary temperature regulating component comprises a nozzle temperature measuring device and a nozzle heating assembly, and the nozzle temperature measuring device is arranged on the outer wall of the nozzle of the injection molding machine. The nozzle heating component comprises an electric heating ring, and a nozzle protective layer is arranged in the electric heating ring.
Preferably, the nozzle temperature measuring device is a temperature measuring thermocouple, the nozzle heating component is an electric heating ring, the electric heating ring is arranged around the nozzle of the injection molding machine, and the electric heating ring and the temperature measuring thermocouple are respectively connected with the self-control module. The temperature thermocouple is connected with a secondary instrument, the secondary instrument displays the temperature measured by the temperature thermocouple, and a thermoelectromotive force signal generated by the temperature thermocouple is uploaded to the self-control module.
Preferably, the three-level temperature regulating component comprises an injection molding machine electric heating coil group, a temperature regulating valve and a temperature sensor, and the injection molding machine electric heating coil group, the temperature regulating valve and the temperature sensor are respectively connected with the PID control module. The temperature adjusting valve is connected with the air inlet control device, and the temperature sensor is arranged in the charging barrel.
The invention discloses a control method of a temperature control system of an injection molding machine and a mold, which comprises the following specific steps:
s1, starting a device, and heating the raw material in the charging barrel to 80% of the preset temperature through an electric heating coil group of the injection molding machine;
s2, respectively increasing the temperature of each section of electric heating ring of the electric heating ring group of the injection molding machine by controlling a variable method until the raw material in the charging barrel reaches a preset temperature;
s3, setting one half of electric heating coils with high temperature adjusting effect in the electric heating coil group of the injection molding machine as a high feedback electric heating coil group, and setting the other half of the electric heating coils as a low feedback electric heating coil group;
s4, temperature deviation calculation is carried out through data of the temperature sensor, PID parameters are corrected according to the calculation result, a PID feedback path is selected, and temperature regulation and control of the charging barrel are carried out;
s5, adjusting parameters of the self-control module through the control terminal according to the injection molding raw materials, and regulating and controlling the temperature of the nozzle;
s6, adjusting the parameters of the mold temperature control module through the control terminal according to the injection molding raw material, and regulating and controlling the temperature of the mold.
The temperature control method has the advantages that all the electric heating coil groups of the injection molding machine are not selected to be subjected to temperature control, on one hand, the parameter variation is large, the control precision is low, on the other hand, the energy utilization rate is low, and the temperature control precision and efficiency can be effectively improved by the method of dividing the electric heating coil groups of the injection molding machine into two groups.
Preferably, the step S4 specifically includes:
s41 dividing the temperature deviation into a temperature within 1 ℃ and a temperature outside 1 ℃;
s42, if the temperature deviation is within 1 ℃ of the preset temperature, the PID control module is used for regulating and controlling the low feedback electric heating coil group;
if the temperature deviation is out of the preset temperature of 1 ℃, a PID control module is used for regulating and controlling the high-feedback electric heating coil group and the temperature regulating valve.
When the temperature deviation is out of the preset temperature of 1 ℃, the high-feedback electric heating coil group is controlled monotonously, the adjusting speed is low, the high-feedback electric heating coil group is required to be combined with the temperature adjusting valve, air is fed into the charging barrel to be subjected to temperature control, the alarm module is triggered by overhigh temperature, and the temperature adjusting valve is required to be subjected to rapid cooling.
Preferably, the step S5 specifically includes:
s51, setting a temperature control threshold value in a self-control module according to the injection molding raw material;
s52, if the temperature uploaded by the nozzle temperature measuring device is outside the temperature control threshold, controlling the current of the nozzle heating component by the self-control module until the temperature of the nozzle is within the temperature control threshold.
Different injection molding temperature thresholds of different injection molding raw materials are different, different temperature thresholds need to be set, the temperature at the nozzle is generally lower than the temperature of the charging barrel, so the nozzle heating assembly is in an open state, and the heating temperature is changed by changing the current of the nozzle heating assembly.
Preferably, the step S6 specifically includes:
s61, setting a mold temperature threshold value in the mold temperature control module according to the injection molding raw material;
s62, adjusting the parameters of the mould temperature adjusting device according to the temperature fed back by the mould temperature sensing device, and controlling the temperature in the mould within the mould temperature threshold value. And the parameters of the mold temperature adjusting device are flow rate parameters of cooling liquid.
The invention has the advantages that
1. The temperature control precision in the charging barrel, the nozzle and the die is improved, the product molding quality is good, and the molding efficiency is high;
2. the feedback speed for the temperature is high by an intelligent control method;
3. the electric heating ring on-off loss of the traditional method for controlling the temperature of the injection molding machine by the switching power supply is large, the switching loss can be reduced, and the electric power is greatly saved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a flow chart of a method of the present invention.
In the figure, 1, a mould temperature sensing device, 2, a mould, 3, a mould temperature adjusting device, 4, a nozzle temperature measuring device, 5, a nozzle heating component, 6, a nozzle, 7, a temperature sensor, 8, an injection molding machine electric heating ring group, 9, a charging barrel, 10 and a temperature adjusting valve.
Detailed Description
The specific embodiments described herein are merely illustrative of the spirit of the invention.
Example (b): the temperature control system of injection molding machine and mould of this embodiment, as shown in fig. 1, includes mould 2, 2 inside mould attemperator 3 that is equipped with of mould, mould attemperator 3 and mould temperature control module are connected, 2 inside mould that still is equipped with mould temperature sensing device 1 of mould, mould temperature sensing device 1 and mould temperature control module are connected. The die 2 is fed by a nozzle 6, the nozzle 6 is provided with a nozzle temperature measuring device 4, the nozzle temperature measuring device comprises a temperature measuring thermocouple, the temperature measuring thermocouple can directly measure the temperature and convert the temperature signal into a thermoelectromotive force signal, the temperature measuring thermocouple is connected with a secondary instrument, the secondary instrument converts the thermoelectromotive force signal into the nozzle temperature for display, the nozzle temperature measuring device 4 is connected with a self-control module, the thermoelectromotive force signal generated by the temperature measuring thermocouple is uploaded to the self-control module, the nozzle 6 is further provided with a nozzle heating component 5, the nozzle heating component 5 comprises an electric heating coil, the electric heating coil is connected with the self-control module, the self-control module controls the electric heating coil current to realize the regulation and control of the heating temperature, the nozzle 6 is connected with a charging barrel 9, a temperature sensor 7 is arranged in the charging barrel 9, and the temperature sensor 7 is connected with a PID control module, the temperature sensor 7 uploads the temperature in the charging barrel to the PID control module, an injection molding machine electric heating ring set 8 is arranged on the charging barrel 9, the injection molding machine electric heating ring set 8 is connected with the PID control module, the PID control module changes the heating temperature through changing the current of the injection molding machine electric heating ring set 8, the temperature sensor 7 is connected with the alarm module, when the feedback temperature of the temperature sensor 7 reaches an alarm threshold value, the alarm module sends out an alarm signal, the charging barrel 9 is further provided with a temperature adjusting valve 10, the temperature adjusting valve 10 is connected with air inlet equipment, the temperature adjusting valve 10 is further connected with the PID control module, and the PID control module reduces the temperature of the charging barrel 9 through changing the air inflow of the temperature adjusting valve 10. The mould temperature control module, the self-control module, the PID control module and the control terminal are connected, and the control terminal enables staff to operate to adjust parameters.
The control method of the temperature control system of the injection molding machine and the mold comprises the following specific steps:
s1, starting a device, and heating the raw material in the charging barrel to 80% of the preset temperature through an electric heating coil group of the injection molding machine;
s2, respectively increasing the temperature of each section of electric heating ring of the electric heating ring group of the injection molding machine by a variable control method until the raw material in the charging barrel reaches a preset temperature;
s3, setting one half of electric heating coils with high temperature adjusting effect in the electric heating coil group of the injection molding machine as a high feedback electric heating coil group, and setting the other half of the electric heating coils as a low feedback electric heating coil group;
the temperature of the electric heating coil group is controlled in the traditional scheme, but the change of the temperature control parameter of the method causes large overshoot of control, low control precision and high energy consumption of control, and the zonal control is adopted firstly to reduce the influence capability of the electric heating coil parameter and facilitate the control of the control precision.
S4, temperature deviation calculation is carried out through data of the temperature sensor, PID parameters are corrected according to the calculation result, a PID feedback path is selected, and temperature regulation and control of the charging barrel are carried out;
the step S4 specifically includes:
s41 dividing the temperature deviation into a temperature within 1 ℃ and a temperature outside 1 ℃;
s42, if the temperature deviation is within 1 ℃ of the preset temperature, the PID control module is used for regulating and controlling the low feedback electric heating coil group;
when the temperature deviation is out of the preset temperature of 1 ℃, the high-feedback electric heating coil group is controlled monotonously, the adjusting speed is low, the high-feedback electric heating coil group is required to be combined with the temperature adjusting valve, air is fed into the charging barrel to be subjected to temperature control, the alarm module is triggered by overhigh temperature, and the temperature adjusting valve is required to be subjected to rapid cooling.
S5, adjusting parameters of the self-control module through the control terminal according to the injection molding raw materials, and regulating and controlling the temperature of the nozzle;
the step S5 specifically includes:
s51, setting a temperature control threshold value in a self-control module according to the injection molding raw material;
s52, if the temperature uploaded by the nozzle temperature measuring device is outside the temperature control threshold, controlling the current of the nozzle heating component by the self-control module until the temperature of the nozzle is within the temperature control threshold.
Different injection molding temperature thresholds of different injection molding raw materials are different, different temperature thresholds need to be set, the temperature at the nozzle is generally lower than the temperature of the charging barrel, so the nozzle heating assembly is in an open state, and the heating temperature is changed by changing the current of the nozzle heating assembly.
S6, adjusting the parameters of the mold temperature control module through the control terminal according to the injection molding raw material, and regulating and controlling the temperature of the mold.
The step S6 specifically includes:
s61, setting a mold temperature threshold value in a mold temperature control module according to the injection molding raw material;
s62, adjusting the parameters of the mould temperature adjusting device according to the temperature fed back by the mould temperature sensing device, and controlling the temperature in the mould within the mould temperature threshold value. And the parameters of the mold temperature adjusting device are flow rate parameters of cooling liquid.
The invention can more accurately control the production temperature, efficiency and quality of the plastic product by a method of combining the temperature control of the die, the temperature control of the nozzle and the temperature control of the charging barrel.
Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although mold temperature control modules, self-control modules, nozzle temperature measuring devices, mold temperature adjusting devices are used more extensively herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (9)
1. The utility model provides a temperature control system of injection molding machine and mould, its characterized in that, includes one-level tempering part, second grade tempering part, tertiary tempering part, mould temperature control module, from control module, alarm module, PID control module and operation terminal, one-level tempering part is connected with mould temperature control module, second grade tempering part is connected with from control module, tertiary tempering part and PID control module are connected, from control module according to filling material setting temperature threshold value in the injection molding machine, mould temperature control module, from control module, PID control module are connected with operation terminal respectively, alarm module and tertiary tempering part are connected.
2. The system of claim 1, wherein the primary temperature control unit comprises a mold temperature control device and a mold temperature sensing device, the mold temperature control device is disposed on the mold, the mold temperature sensing device is disposed on the inner wall of the mold, and the mold temperature control device and the mold temperature sensing device are respectively connected to the mold temperature control module.
3. The system of claim 1, wherein the secondary temperature control unit comprises a nozzle temperature measuring device and a nozzle heating assembly, and the nozzle temperature measuring device is disposed on an outer wall of a nozzle of the injection molding machine.
4. The system as claimed in claim 3, wherein the nozzle temperature measuring device is a temperature measuring thermocouple, the nozzle heating element is an electric heating ring, the electric heating ring is disposed around the nozzle of the injection molding machine, and the electric heating ring and the temperature measuring thermocouple are respectively connected to the self-control module.
5. The system of claim 1, wherein the three-stage temperature control unit comprises an injection molding machine electric heating coil set, a temperature control valve and a temperature sensor, and the injection molding machine electric heating coil set, the temperature control valve and the temperature sensor are respectively connected with the PID control module.
6. A control method based on the temperature control system of the injection molding machine and the mold according to any one of claims 1 to 5, characterized by comprising the steps of:
s1, starting a device, and heating the raw material in the charging barrel to 80% of the preset temperature through an electric heating coil group of the injection molding machine;
s2, respectively increasing the temperature of each section of electric heating ring of the electric heating ring group of the injection molding machine by a variable control method until the raw material in the charging barrel reaches a preset temperature;
s3, setting one half of electric heating coils with high temperature adjusting effect in the electric heating coil group of the injection molding machine as a high feedback electric heating coil group, and setting the other half of the electric heating coils as a low feedback electric heating coil group;
s4, temperature deviation calculation is carried out through data of the temperature sensor, PID parameters are corrected according to the calculation result, a PID feedback path is selected, and temperature regulation and control of the charging barrel are carried out;
s5, adjusting parameters of the self-control module through the control terminal according to the injection molding raw materials, and regulating and controlling the temperature of the nozzle;
s6, adjusting the parameters of the mold temperature control module through the control terminal according to the injection molding raw material, and regulating and controlling the temperature of the mold.
7. The method of claim 6, wherein the step S4 specifically includes:
s41 dividing the temperature deviation into a temperature within a preset temperature of 1 ℃ and a temperature outside the preset temperature of 1 ℃;
s42, if the temperature deviation is within 1 ℃ of the preset temperature, the PID control module is used for regulating and controlling the low feedback electric heating coil group;
if the temperature deviation is out of the preset temperature of 1 ℃, a PID control module is used for regulating and controlling the high-feedback electric heating coil group and the temperature regulating valve.
8. The method of claim 6, wherein the step S5 specifically includes:
s51, setting a temperature control threshold value in a self-control module according to the injection molding raw material;
s52, if the temperature uploaded by the nozzle temperature measuring device is outside the temperature control threshold, controlling the current of the nozzle heating component by the self-control module until the temperature of the nozzle is within the temperature control threshold.
9. The method of claim 6, wherein the step S6 includes steps of:
s61, setting a mold temperature threshold value in a mold temperature control module according to the injection molding raw material;
s62, adjusting the parameters of the mould temperature adjusting device according to the temperature fed back by the mould temperature sensing device, and controlling the temperature in the mould within the mould temperature threshold value.
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| CN202210279528.1A CN114734603A (en) | 2022-03-21 | 2022-03-21 | Temperature control system and method for injection molding machine and mold |
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| CN202210279528.1A CN114734603A (en) | 2022-03-21 | 2022-03-21 | Temperature control system and method for injection molding machine and mold |
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| CN116100772A (en) * | 2023-02-15 | 2023-05-12 | 浙江博创机械有限公司 | Overheat protection method and overheat protection system for injection molding machine |
| CN116100772B (en) * | 2023-02-15 | 2023-08-25 | 浙江博创机械有限公司 | Overheat protection method and overheat protection system for injection molding machine |
| CN117001969A (en) * | 2023-09-04 | 2023-11-07 | 宁波海雄塑料机械有限公司 | Injection molding machine heating control method and system |
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Application publication date: 20220712 |