CN205033458U - Control system of overcritical CO2 polypropylene foaming production line - Google Patents
Control system of overcritical CO2 polypropylene foaming production line Download PDFInfo
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- CN205033458U CN205033458U CN201520788673.8U CN201520788673U CN205033458U CN 205033458 U CN205033458 U CN 205033458U CN 201520788673 U CN201520788673 U CN 201520788673U CN 205033458 U CN205033458 U CN 205033458U
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- control system
- supercritical
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Abstract
The utility model discloses a control system of overcritical CO2 polypropylene foaming production line, including surveillance center, host computer control system and auxiliary engine control system. Host computer control system includes a PLC controller to and a plurality of electromagnetic valves, a plurality of pressure sensor, a plurality of vector expression measuring bin and the gravity sensor, servo controller, temperature control module, the flow graph that link to each other with a PLC controller, auxiliary engine control system includes the 2nd PLC controller to and the laser thickness gauge, bush clearance automatically regulated aircraft nose, a plurality of converter and the laser diameter measuring instrument that link to each other with the 2nd PLC controller. Carry out real time monitoring and regulation through numerical value such as the pressure to in the overcritical CO2 polypropylene foaming production line, temperature, screw rod rotational speed, inventories, realized the coordinated control of each parameter, effectively improved the control accuracy and the production efficiency of overcritical CO2 polypropylene foaming production line.
Description
Technical field
The utility model relates to polypropylene expanded production control field, is specifically related to a kind of supercritical CO
2the control system of polypropylene expanded production line.
Background technology
PP foam material has good flexibility, shock-resistant, high temperature resistant, and product degradable, be widely used as the alternative materials of PE, PVC, PS gradually in recent years.Supercritical CO
2nontoxic, odorlessness, do not fire not quick-fried, and can dissolve preferably in the polymer, be carry out polypropylene expanded perfect gas.As shown in Figure 1, supercritical CO is utilized at present
2produce PP foam material, whole production line comprises hopper, supercritical CO
2the part such as injection device, extruder (comprising single order extruder and two-stage extrusion machine), extrusion die, Aided Machine, the technological process related to be followed successively by feed intake, injecting gas, shear-mixed, extrude, the step such as shaping.In prior art, many employings are separated instrument and control separately said process, cannot coordinate the operating temperature of inlet amount, screw speed, extruder and pressure, and obtain good foaming effect and depend on coordination to inventory, screw speed, temperature, pressure and other parameters in production process, independent control cannot reach the precision of needs, thus cause foaming effect poor, directly affect product quality.In addition, separation instrument is adopted to control system, need to utilize and manually each monitoring variable in production process read and rely on the physical quantity read to carry out next step operation, cannot monitor in real time the duty of whole system, and respond fast when monitoring variable changes, thus cause production efficiency low.
Summary of the invention
The utility model provides a kind of supercritical CO
2the control system of polypropylene expanded production line, to solve the low and problem that production efficiency is not high of the polypropylene expanded production line control accuracy existed in prior art.
To achieve these goals, the technical scheme of employing is the utility model:
A kind of supercritical CO
2the control system of polypropylene expanded production line, comprises Surveillance center, engine control system and auxiliaries control system; Surveillance center's sending controling instruction is to engine control system and auxiliaries control system and the image data that sends it back of Receiving Host control system and auxiliaries control system.Described Surveillance center is the host computer being provided with human-computer interaction interface, and Surveillance center is connected with auxiliaries control system with engine control system by Ethernet.
Described engine control system comprises the first PLC, and the multiple electromagnetic valves be connected with the first PLC, multiple pressure sensor, multiple vector expression weigh-hatching plant and gravity sensor, servo controller, temperature control modules, flow graph.
Further, described electromagnetic valve is three, is respectively used to control supercritical CO
2the switch of the injection flow of inlet, the switch of two-stage extrusion machine head and two-stage extrusion machine screw core circulating cooling water pump/oil pump.
Further, described pressure sensor is two, is respectively used to supercritical CO
2the pressure at inlet and two-stage extrusion machine head place carries out gathering and feeds back to the first PLC.
Further, described gravity sensor is at least two, is arranged at respectively and is at least on the vector expression weigh-hatching plant of two, by measuring Hopper Weight reduction, weighs to raw material and auxiliary agent.
Further, described servo controller is connected to the first motor and the second motor respectively, for controlling the screw speed of single order extruder and two-stage extrusion machine.
Further, described temperature control modules is high Accuracy PID temperature controller, be made up of the temperature probe connected successively, temperature voltage change-over circuit, A/D circuit, processor, D/A circuit, voltage-controlled current source and thermocouple, for controlling the temperature of single order extruder and two-stage extrusion machine.Described temperature control modules can control between 26 temperature-controlled areas, by temperature probe, the temperature between temperature-controlled area is gathered, by temperature voltage change-over circuit, temperature signal is converted to voltage signal, by A/D circuit, voltage signal is converted to data signal again and flows to processor, the normal working temperature scope between temperature-controlled area is provided with in processor, when temperature when between the temperature-controlled area collected is not in operating temperature range, processor is by D/A circuit, voltage-controlled current source controls thermocouple work, and act between temperature-controlled area, make within the scope of the temperature return normal working temperature between temperature-controlled area.
Further, described flow graph is used for supercritical CO in single order extruder
2carry out on-line testing with polyacrylic solubility and the solubility recorded is fed back to the first PLC.The solubility that first PLC records based on flow graph outputs control signals to supercritical CO
2the electromagnetic valve of inlet, by the size adjustment supercritical CO of Controlling solenoid valve door
2injection rate.
Described auxiliaries control system comprises the second PLC, and the laser thickness gauge be connected with the second PLC, mouth die clearance automatic regulating machine head, multiple frequency converter and laser diameter measuring instrument.
Further, described laser thickness gauge is for the thickness of expanded material that detects extrusion die and extrude and thickness feedback to the second PLC that will detect; The thickness of the expanded material that the second PLC records based on laser thickness gauge outputs control signals to a mouthful die clearance automatic regulating machine head, and counterpart die clearance adjusts.
Further, described frequency converter is at least two, for controlling traction and the calendering of expanded material; Described laser diameter measuring instrument is used for the expanded material after to traction, calendering and carries out fixed length cutting.
Advantageous Effects of the present utility model is: a kind of supercritical CO that the utility model provides
2the control system of polypropylene expanded production line, by Surveillance center, engine control system and auxiliaries control system to supercritical CO
2the numerical value such as the pressure in polypropylene expanded production line, temperature, screw speed, inventory carry out real-time monitoring and adjustment, achieve the cooperation control of parameters, effectively improve supercritical CO
2the control accuracy of polypropylene expanded production line and production efficiency.
Accompanying drawing explanation
Fig. 1 utilizes supercritical CO in background technology
2produce the structural representation of PP foam material production line.
Fig. 2 is the supercritical CO that the utility model embodiment provides
2the structural representation of the control system of polypropylene expanded production line.
Fig. 3 is the structural representation of the engine control system that the utility model embodiment provides.
Fig. 4 is the structural representation of the temperature control modules that the utility model embodiment provides.
Fig. 5 is the structural representation of the auxiliaries control system that the utility model embodiment provides.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only for explaining the utility model, the restriction to the concrete protection domain of the utility model can not be interpreted as.
As shown in Figure 2, a kind of supercritical CO of providing of the present embodiment
2the control system of polypropylene expanded production line, comprises Surveillance center, engine control system and auxiliaries control system; Surveillance center's sending controling instruction is to engine control system and auxiliaries control system and the image data that sends it back of Receiving Host control system and auxiliaries control system.Described Surveillance center is the host computer being provided with human-computer interaction interface, Surveillance center is connected with auxiliaries control system with engine control system by Ethernet, for each data in the production line collected are presented to technical staff in real time, actualizing technology personnel are to the ACTIVE CONTROL of production line links simultaneously.
As shown in Figure 3, described engine control system comprises the first PLC, and the multiple electromagnetic valves be connected with the first PLC, multiple pressure sensor, multiple vector expression weigh-hatching plant and gravity sensor, servo controller, temperature control modules, flow graph.
In the present embodiment, described electromagnetic valve is three, is respectively used to control supercritical CO
2the switch of the injection flow of inlet, the switch of two-stage extrusion machine head and two-stage extrusion machine screw core circulating cooling water pump/oil pump.Wherein, supercritical CO
2the electromagnetic valve of inlet is automatically controlled reset valve, from be closed to open can be trickle continuously adjustment supercritical CO
2injection flow, to realize accurate control.The electromagnetic valve of hopper dog-house and the electromagnetic valve co-ordination of two-stage extrusion machine head, based on dynamic flow balancing principle, by controlling the inventory of hopper and the extruded foaming materials amount of two-stage extrusion machine head, control pressure oscillation in extruder.In addition, the electromagnetic valve of two-stage extrusion machine screw core circulating cooling water pump/oil pump, by controlling the switch of two-stage extrusion machine screw core circulating cooling water pump/oil pump, realizes controlling the temperature of two-stage extrusion machine, low temperature is extruded and is achieved.
Described pressure sensor is two, is respectively used to supercritical CO
2the pressure at inlet and two-stage extrusion machine head place carries out gathering and feeds back to the first PLC.To supercritical CO
2the object that the pressure at inlet and two-stage extrusion machine head place carries out gathering is to monitor the pressure of single order extruder and two-stage extrusion machine, with control supercritical CO
2the electromagnetic valve of the switch of the injection flow of inlet, the inventory of hopper, two-stage extrusion machine head forms closed-loop system, thus realizes the monitor and forecast to the pressure in single order extruder and two-stage extrusion machine.
Described gravity sensor is at least two, is arranged at respectively and is at least on the vector expression weigh-hatching plant of two.In the present embodiment, vector expression weigh-hatching plant is three, be respectively used to throw in A raw material, B raw material and auxiliary agent, corresponding gravity sensor has three, under being arranged at three vector expression weigh-hatching plants respectively, by measuring vector expression weigh-hatching plant weight reduction, the injected volume of A raw material, B raw material and auxiliary agent is weighed.In the present embodiment, A raw material is polypropylene, and B raw material and auxiliary agent add according to the selection kind that needs of producing.
Described servo controller is connected to the first motor and the second motor respectively, for controlling the screw speed of single order extruder and two-stage extrusion machine, make the screw speed of single order extruder and two-stage extrusion machine constant in ± 1 turn of deviation, from avoiding the impact of screw speed on temperature and pressure in extruder to a great extent, make the service behaviour of extruder more stable.
As shown in Figure 4, described temperature control modules is high Accuracy PID temperature controller, be made up of the temperature probe connected successively, temperature voltage change-over circuit, A/D circuit, processor, D/A circuit, voltage-controlled current source and thermocouple, for controlling the temperature of single order extruder and two-stage extrusion machine.Described temperature control modules can control between 26 temperature-controlled areas, by temperature probe, the temperature between temperature-controlled area is gathered, by temperature voltage change-over circuit, temperature signal is converted to voltage signal, by A/D circuit, voltage signal is converted to data signal again and flows to processor, the normal working temperature between temperature-controlled area is provided with in processor, temperature when between the temperature-controlled area collected is not in operating temperature, time, processor is by D/A circuit, voltage-controlled current source controls thermocouple work, and act between temperature-controlled area, make the temperature return normal working temperature between temperature-controlled area.This temperature control modules, based on PID temperature control principle, carries out comprehensive monitoring and high accuracy control to the temperature between temperature-controlled area.Between the temperature-controlled area described in the present embodiment, be that the zones of different of single order extruder and two-stage extrusion machine is divided between 26 temperature-controlled areas.
Temperature control modules and the water pump/oil pump co-ordination of two-stage extrusion machine screw core circulating cooling, associating temperature control, improves the precision of two-stage extrusion machine temperature control, and gentle outer temperature in two-stage extrusion machine is differed within the scope of ± 1% DEG C, polyacrylic viscoplasticity is recovered, adds expandable.
Flow graph is used for supercritical CO in single order extruder
2carry out on-line testing with polyacrylic solubility and the solubility recorded is fed back to the first PLC.The solubility that first PLC records based on flow graph outputs control signals to supercritical CO
2the electromagnetic valve of inlet, by the size adjustment supercritical CO of Controlling solenoid valve door
2injection rate.
As shown in Figure 5, auxiliaries control system comprises the second PLC, and the laser thickness gauge be connected with the second PLC, mouth die clearance automatic regulating machine head, multiple frequency converter and laser diameter measuring instrument.
Laser thickness gauge is for the thickness of expanded material that detects extrusion die and extrude and thickness feedback to the second PLC that will detect; The thickness of the expanded material that the second PLC records based on laser thickness gauge outputs control signals to a mouthful die clearance automatic regulating machine head, and counterpart die clearance adjusts.As the thickness of expanded material need be increased, then increase mouth die clearance width; As the thickness of expanded material need be reduced, then reduce mouth die clearance width.
Described frequency converter is at least two, for controlling traction and the calendering of expanded material; Described laser diameter measuring instrument is used for the expanded material after to traction, calendering and carries out fixed length cutting.In the present embodiment, frequency converter is provided with two, and one of them is for controlling the hauling speed of hauling machine, and another one is for controlling the rolling velocity of tri-roll press machine.In the present embodiment, the measurement of laser diameter measuring instrument is set to 2 meters, namely to the expanded material after traction, calendering every 2 meters of cuttings once.Final formation specification is the PP foam material sheet material of 2 meters.
A kind of supercritical CO that the present embodiment provides
2the specific works process of the control system of polypropylene expanded production line is: staff set need to throw in A raw material, B raw material and auxiliary agent amount and in host computer by human-computer interaction interface input monitoring center, above-mentioned control signal is sent to the first PLC by host computer, and the first PLC controls the input that vector expression weigh-hatching plant carries out raw material and auxiliary agent.In the launch process that vector expression weigh-hatching plant carries out raw material and auxiliary agent, gravity sensor continual measurement vector expression weigh-hatching plant weight reduction by this numeric feedback to the first PLC, when the vector expression weigh-hatching plant weight reduction that gravity sensor records is consistent with the numerical value that staff sets, the first PLC controls vector expression weigh-hatching plant and stops throwing in.
Staff sets single order extruder and two-stage extrusion machine screw speed, and by the host computer at human-computer interaction interface input monitoring center, above-mentioned control signal is sent to the first PLC by host computer.First PLC sends a control signal to servo controller, servo controller is connected to the first motor and the second motor respectively, for controlling the screw speed of single order extruder and two-stage extrusion machine, make the screw speed of single order extruder and two-stage extrusion machine constant in ± 1 turn of deviation range.
Staff sets the supercritical CO of needs
2injection rate and by the host computer at human-computer interaction interface input monitoring center, above-mentioned control signal is sent to the first PLC by host computer.First PLC sends a control signal to supercritical CO
2the electromagnetic valve of inlet, by the unlatching to electromagnetic valve, adjustment supercritical CO trickle continuously
2injection rate, until meet the demands.
At supercritical CO
2after polypropylene expanded production line is started working, need constantly to monitor the temperature and pressure of single order extruder and two-stage extrusion machine and regulate in whole process.
The monitoring of single order extruder temperature and adjustment are realized by temperature control modules.Realized by temperature control modules and the electromagnetic valve that is arranged at two-stage extrusion machine screw core circulating cooling water pump/oil pump to the monitoring of two-stage extrusion machine temperature and adjustment.
Carrying out monitoring to the pressure in single order extruder and two-stage extrusion machine is by being arranged at supercritical CO
2the pressure sensor at inlet and two-stage extrusion machine head place realizes.Be arranged at supercritical CO
2the pressure of pressure sensor to single order extruder and two-stage extrusion machine at inlet and two-stage extrusion machine head place gathers and feeds back to the first PLC.
Regulating the pressure in single order extruder and two-stage extrusion machine is by controlling the inventory of vector expression weigh-hatching plant, the switch of two-stage extrusion machine head realizing in conjunction with fluctuation control.
At raw material and supercritical CO
2carry out in single order extruder in the process of shear-mixed, by flow graph to supercritical CO in single order extruder
2carry out on-line testing with structure adaptability degree and the solubility recorded is fed back to the first PLC.The solubility that first PLC records based on flow graph outputs control signals to supercritical CO
2the electromagnetic valve of inlet, by the size adjustment supercritical CO of Controlling solenoid valve door
2injection rate.
When raw material and supercritical CO
2in extruder through shearing, dispersion, distributed rendering after forming homogeneous phase solution, being reduced by the temperature of two-stage extrusion machine makes homogeneous phase solution viscoplasticity recover, again by the Quick Depressurization nozzle of extrusion die, dissolved gases in homogeneous phase solution is made to be in unstable hypersaturated state, produce a large amount of nuclei of bubbles, and fast nucleation, and be released into atmospheric pressure, complete foaming.The thickness of mouth mould to expanded material of extrusion die controls.Laser thickness gauge is for the thickness of expanded material that detects extrusion die and extrude and thickness feedback to the second PLC that will detect; The thickness of the expanded material that the second PLC records based on laser thickness gauge outputs control signals to a mouthful die clearance automatic regulating machine head, and counterpart die clearance adjusts.As the thickness of expanded material need be increased, then increase mouth die clearance width; As the thickness of expanded material need be reduced, then reduce mouth die clearance width.
Aided Machine is used for drawing the expanded material through extrusion die, rolling and fixed length cutting.In the present embodiment, frequency converter is provided with two, and one of them is for controlling the hauling speed of hauling machine, and another one is for controlling the rolling velocity of tri-roll press machine.In the present embodiment, the measurement of laser diameter measuring instrument is set to 2 meters, namely to the expanded material after traction, calendering every 2 meters of cuttings once.Final formation specification is the PP foam material sheet material of 2 meters.
The above is only preferred embodiment of the present utility model; be noted that for those skilled in the art; under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (10)
1. a supercritical CO
2the control system of polypropylene expanded production line, is characterized in that, comprises Surveillance center, engine control system and auxiliaries control system; Surveillance center's sending controling instruction is to engine control system and auxiliaries control system and the image data that sends it back of Receiving Host control system and auxiliaries control system.
2. a kind of supercritical CO as claimed in claim 1
2the control system of polypropylene expanded production line, it is characterized in that, described engine control system comprises the first PLC, and the multiple electromagnetic valves be connected with the first PLC, multiple pressure sensor, multiple vector expression weigh-hatching plant and gravity sensor, servo controller, temperature control modules, flow graph.
3. a kind of supercritical CO as claimed in claim 2
2the control system of polypropylene expanded production line, is characterized in that, described electromagnetic valve is three, is respectively used to control supercritical CO
2the switch of the injection flow of inlet, the switch of two-stage extrusion machine head and two-stage extrusion machine screw core circulating cooling water pump/oil pump.
4. a kind of supercritical CO as claimed in claim 2
2the control system of polypropylene expanded production line, is characterized in that, described pressure sensor is two, is respectively used to supercritical CO
2the pressure at inlet and two-stage extrusion machine head place carries out gathering and feeds back to the first PLC.
5. a kind of supercritical CO as claimed in claim 2
2the control system of polypropylene expanded production line, is characterized in that, described gravity sensor is at least two, is arranged at respectively and is at least on the vector expression weigh-hatching plant of two.
6. a kind of supercritical CO as claimed in claim 2
2the control system of polypropylene expanded production line, is characterized in that, described servo controller is connected to the first motor and the second motor respectively, for controlling the screw speed of single order extruder and two-stage extrusion machine.
7. a kind of supercritical CO as claimed in claim 2
2the control system of polypropylene expanded production line, it is characterized in that, described temperature control modules is made up of the temperature probe connected successively, temperature voltage change-over circuit, A/D circuit, processor, D/A circuit, voltage-controlled current source and thermocouple, for controlling the temperature of single order extruder and two-stage extrusion machine.
8. a kind of supercritical CO as claimed in claim 2
2the control system of polypropylene expanded production line, is characterized in that, described flow graph is used for supercritical CO in single order extruder
2carry out on-line testing with polyacrylic solubility and the solubility recorded is fed back to the first PLC.
9. a kind of supercritical CO as claimed in claim 1
2the control system of polypropylene expanded production line, is characterized in that, described auxiliaries control system comprises the second PLC, and the laser thickness gauge be connected with the second PLC, mouth die clearance automatic regulating machine head, multiple frequency converter and laser diameter measuring instrument.
10. a kind of supercritical CO as claimed in claim 9
2the control system of polypropylene expanded production line, is characterized in that, described laser thickness gauge is for the thickness of expanded material that detects extrusion die and extrude and thickness feedback to the second PLC that will detect; Described frequency converter is at least two, for controlling traction and the calendering of expanded material; Described laser diameter measuring instrument is used for the expanded material after to traction, calendering and carries out fixed length cutting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520788673.8U CN205033458U (en) | 2015-10-13 | 2015-10-13 | Control system of overcritical CO2 polypropylene foaming production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520788673.8U CN205033458U (en) | 2015-10-13 | 2015-10-13 | Control system of overcritical CO2 polypropylene foaming production line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205033458U true CN205033458U (en) | 2016-02-17 |
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ID=55292386
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520788673.8U Expired - Fee Related CN205033458U (en) | 2015-10-13 | 2015-10-13 | Control system of overcritical CO2 polypropylene foaming production line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205033458U (en) |
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2015
- 2015-10-13 CN CN201520788673.8U patent/CN205033458U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160217 Termination date: 20211013 |
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| CF01 | Termination of patent right due to non-payment of annual fee |