CN110561715A - High-pressure melt injection method and high-pressure melt injection system - Google Patents

High-pressure melt injection method and high-pressure melt injection system Download PDF

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Publication number
CN110561715A
CN110561715A CN201910688773.6A CN201910688773A CN110561715A CN 110561715 A CN110561715 A CN 110561715A CN 201910688773 A CN201910688773 A CN 201910688773A CN 110561715 A CN110561715 A CN 110561715A
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China
Prior art keywords
melt
pressure
pipeline
injection
signal
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CN201910688773.6A
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Chinese (zh)
Inventor
顾自江
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Wuxi Juxin Technology Co Ltd
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Wuxi Juxin Technology Co Ltd
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Priority to CN201910688773.6A priority Critical patent/CN110561715A/en
Publication of CN110561715A publication Critical patent/CN110561715A/en
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Classifications

    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/255—Flow control means, e.g. valves
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/29—Feeding the extrusion material to the extruder in liquid form
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92019—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92333—Raw material handling or dosing, e.g. active hopper or feeding device
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92828—Raw material handling or dosing, e.g. active hopper or feeding device
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92971—Fluids, e.g. for temperature control or of environment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

the invention relates to a high-pressure melt injection method and a high-pressure melt injection system, which comprise a first pipeline for conveying main melt and a second pipeline for conveying additive melt; the input end of the second pipeline is connected with the output end of the melting extruder, the output end of the second pipeline is connected with an injection point on the first pipeline through an injection valve, and the input end of the injection valve is provided with a metering pump; the method is characterized in that: the first pipeline is provided with a melt quantity signal acquisition point, the melt quantity signal acquisition point is connected with a controller, a control signal output end of the controller is connected with the metering pump, and the rotating speed of the metering pump is adjusted on line in real time according to a signal value of the melt quantity signal acquisition point, so that the proportion of the added melt injected into the main melt is stable. The invention can realize the stable proportion when the added melt is injected into the main melt.

Description

High-pressure melt injection method and high-pressure melt injection system
Technical Field
The invention relates to a high-pressure melt injection method and a high-pressure melt injection system, in particular to a method and a system for stably injecting another melt into a constant melt proportion.
Background
The melt moves in the pipeline from high pressure to low pressure, and when another melt needs to be added into the melt in the pipeline, the pressure of the added melt needs to be higher than the pressure at the position of the adding point. In actual production, the melt pressure and flow rate in the pipe are often unstable, and the injection amount of the added melt is changed by the extrusion temperature, extrusion speed and melt pressure, so that it is difficult to dose the melt into another melt. The variation of the melt pressure can affect the injection amount of the melt, so that the proportion of the two melts is difficult to stabilize when the two melts are mixed, and the product quality is affected by frequent fluctuation.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a high-pressure melt injection method and a high-pressure melt injection system, which can realize stable proportion when an additive melt is injected into a main melt.
According to the technical scheme provided by the invention, the high-pressure melt injection system comprises a first pipeline for conveying main melt and a second pipeline for conveying additive melt; the input end of the second pipeline is connected with the output end of the melting extruder, the output end of the second pipeline is connected with an injection point on the first pipeline through an injection valve, and the input end of the injection valve is provided with a metering pump; the method is characterized in that: the first pipeline is provided with a melt quantity signal acquisition point, the melt quantity signal acquisition point is connected with a controller, a control signal output end of the controller is connected with the metering pump, and the rotating speed of the metering pump is adjusted on line in real time according to a signal value of the melt quantity signal acquisition point, so that the proportion of the added melt injected into the main melt is stable.
Further, the melt quantity signal acquisition point is arranged on the first pipeline at the rear end of the injection point and is used for acquiring the melt quantity signal of the mixed melt after the added melt is injected into the main melt.
Further, the melt quantity signal acquisition points comprise a first acquisition point and a second acquisition point which are respectively arranged on the first pipelines at the front end and the rear end of the injection point, and the first acquisition point and the second acquisition point respectively acquire melt quantity signals before and after the addition melt is injected into the main melt.
And further, the input end of the metering pump is provided with a pressure stability control device, the pressure stability control device comprises a pressure sensor which is arranged at the input end of the metering pump and used for collecting pressure signals at the input end of the metering pump, the signal output end of the pressure sensor is connected with a controller, the control signal output end of the controller is connected with a motor frequency converter of the melting extruder, and the controller controls the rotating speed of the melting extruder according to the pressure signals to stabilize the pressure value of the added melt entering the high-pressure gear pump.
Further, the input of measuring pump sets up pressure stability control device, pressure stability control device is including setting up first pressure sensor and the second pressure sensor in measuring pump input and output respectively, the pressure signal of measuring pump input and output is gathered respectively to first pressure sensor and second pressure sensor, the signal output part connection director of first pressure sensor and second pressure sensor, the motor converter of melting extruder is connected to the control signal output part of controller, the controller is according to the rotational speed of pressure signal control melting extruder, the pressure value that makes the interpolation fuse-element get into the high-pressure gear pump is stable.
Further, the metering pump adopts a high-pressure gear pump.
Furthermore, a plurality of injection points are arranged on the first pipeline, and each injection point is connected with the additive melt pipeline through an injection valve.
The invention also provides a high-pressure melt injection method, which is characterized by comprising the following steps:
(1) the added melt is melted and extruded by a melting extruder and is input into a second pipeline, and the added melt is metered by a metering pump and then is injected into the main melt in the first pipeline through an injection valve;
(2) The injection proportion of the added melt is controlled by the controller in real time on line, the controller collects melt quantity signals of melt quantity signal collection points at the rear end or/and the front end of the injection valve on the first pipeline, and the rotating speed of the metering pump is controlled according to the melt quantity signals, so that the real-time on-line adjustment of the injection quantity of the added melt is realized, and the proportion of the added melt into the main melt is stable.
And further, pressure stability control is carried out before the main melt is input into the metering pump, a pressure sensor acquires a pressure signal at the input end of the metering pump in real time and feeds the pressure signal back to the controller, and the controller controls the rotating speed of the melting extruder according to the pressure signal, so that the pressure value before the added melt enters the metering pump is stable.
and further, pressure stability control is carried out before the main melt is input into the metering pump, pressure signals of the input end and the output end of the metering pump are collected in real time by the pressure sensor and fed back to the controller, and the controller controls the rotating speed of the melting extruder according to the pressure signals, so that the pressure value before the added melt enters the metering pump is stable.
The invention has the following advantages:
(1) According to the invention, a closed-loop control loop is formed by the acquisition of a controller and a melt quantity signal and the accurate control of a metering pump, so that the stable proportion of the added melt injected into the main melt is ensured, and the influence of pressure fluctuation and flow change in a pipeline on the proportion of the mixed melt is avoided;
(2) The pressure stability control device is arranged in front of the metering pump, so that the problem that the pressure and the flow rate of the added melt are unstable in pipeline transportation is solved, the pressure of the melt before entering the metering pump is stable, the added melt is injected into the main melt through the injection valve under the condition of stable pressure, the PLC is ensured not to be influenced by pressure fluctuation when the injection quantity of the added melt is controlled by a melt quantity signal, and the proportion precision of the mixed melt is ensured;
(3) the high-pressure gear pump is used as the metering pump, so that the functions of establishing high pressure and accurately metering are realized, and the pressure of a main melt pipeline can be overcome by adding the melt through the high pressure established by the high-pressure gear pump, so that the injection is smoothly completed.
drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
Detailed Description
the invention is further described below with reference to the accompanying drawings.
Example 1:
A high-pressure melt injection system comprises a first pipe 1 for conveying a main melt A and a second pipe 2 for conveying an additive melt B; the input end of the second pipeline 2 is connected with the output end of the melting extruder 3, the output end of the second pipeline 2 is connected with an injection point on the first pipeline 1 through an injection valve 6, and the additive melt B is injected into the main melt A through the injection valve 6 at the injection point; a metering pump 4 (such as a high-pressure gear pump) is arranged on the second pipeline 2, a pressure sensor 5 for acquiring a pressure signal at the input end of the high-pressure gear pump in real time is arranged at the input end of the high-pressure gear pump, the signal output end of the pressure sensor 5 is connected with a PLC (programmable logic controller), the pressure sensor 5 feeds the acquired pressure signal back to the PLC, the control signal output end of the PLC is connected with a motor frequency converter of the melting extruder 3, the PLC controls the motor frequency converter of the melting extruder 3 according to the pressure signal, the rotating speed of the melting extruder 3 is adjusted through the motor frequency converter, and the pressure value of the added melt B entering the;
A collection point X is arranged on the first pipeline 1 at the output end of the injection valve 62At the collection point X2Collecting melt quantity signal of mixed melt after mixing of additive melt B and main melt A, wherein the collection point X is2the melt quantity signal is transmitted to a PLC, and the PLC compares the set value of the melt to be mixed with the collected melt quantity signal to obtain the addition amount of the melt B to be added in real time; the control signal output end of the PLC is connected with a motor frequency converter of the high-pressure gear pump, the rotating speed of the high-pressure gear pump is adjusted, and the injection amount of the added melt B is correspondingly adjusted in real time so as to ensure the stability of the mixing proportion of the main melt A and the added melt B.
Example 2:
A high-pressure melt injection system comprises a first pipe 1 for conveying a main melt A and a second pipe 2 for conveying an additive melt B; the input end of the second pipeline 1 is connected with the output end of the melting extruder 3, the output end of the second pipeline 1 is connected with an injection point on the first pipeline 1 through an injection valve 6, and the additive melt B is injected into the main melt A through the injection valve 6 at the injection point; a metering pump 4 (such as a high-pressure gear pump) is arranged on the second pipeline 2, a first pressure sensor 5-1 for acquiring a pressure signal at the input end of the high-pressure gear pump in real time is arranged at the input end of the high-pressure gear pump, a second pressure sensor 5-2 for acquiring a pressure signal at the output end of the high-pressure gear pump in real time is arranged at the output end of the high-pressure gear pump, and signal output ends of the first pressure sensor 5-1 and the second pressure sensor 5-2 are connected with a PLC; the control signal output end of the PLC is connected with a motor frequency converter of the melting extruder 3, the PLC controls the motor frequency converter of the melting extruder 3 according to the pressure signal of the first pressure sensor 5-1, the rotating speed of the melting extruder 3 is adjusted through the motor frequency converter, and the pressure value of the added melt B entering the high-pressure gear pump is ensured to be constant; in addition, the PLC judges the abnormal working state of the high-pressure gear pump according to the received pressure signal collected by the second pressure sensor 5-2, and when the high-pressure gear pump works abnormally, the PLC controls the melting extruder to stop working;
a collection point X is arranged on the first pipeline at the front end of the injection point1a collection point X is arranged on the first pipeline 1 at the rear end of the injection point2Collection point X1and acquisition Point X2is connected to a PLC which is connected with a collection point X1The melt quantity signal of the injection valve obtains a predicted value D of the output end of the injection valve, and the predicted value D and the acquisition point X are compared2comparing the melt quantity signals to obtain the real-time addition quantity of the added melt B; the signal control end of the PLC is connected with a motor frequency converter of the high-pressure gear pump, the PLC controls the motor frequency converter of the high-pressure gear pump according to the real-time adding amount, the rotating speed of the high-pressure gear pump is adjusted, and the injection amount of the added melt B is correspondingly adjusted in real time so as to ensure the stability of the mixing proportion of the main melt A and the added melt B.
Example 3:
A high-pressure melt injection method adopts the high-pressure body injection system described in the embodiment 1 to inject an additive melt B into a main melt A, wherein the main melt A is conveyed in a first pipeline 1, and the additive melt B is conveyed in a second pipeline 2; the method specifically comprises the following steps:
(1) Adding the melt B, melting and extruding the added melt B by a melting extruder 3, inputting the added melt B into a second pipeline 2, designing a metering pump 4 on the second pipeline 2, wherein the metering pump 4 adopts a high-pressure gear pump in the embodiment, and the input end of the high-pressure gear pump is provided with a pressure sensor 5; the pressure sensor 5 collects a pressure signal at the input end of the high-pressure gear pump in real time and feeds the pressure signal back to the PLC, the PLC controls a motor frequency converter of the melting extruder 3 according to the pressure signal, the rotating speed of the melting extruder 3 is adjusted through the frequency converter of the motor, and the pressure value of the added melt B entering the high-pressure gear pump is ensured to be constant;
The pressure sensor 5 is mainly used for collecting a pressure signal at the input end of the high-pressure gear pump, and the pressure of the melt output by the melting extruder 3 is influenced by the extrusion speed of the melting extruder 3 and the like, so that the pressure of the melt entering the high-pressure gear pump is unstable; in the embodiment, closed-loop control is formed among the pressure sensor 5, the PLC and the melting extruder 3, the pressure signal of the pressure sensor 5 is transmitted to the PLC, and the PLC adjusts the extrusion speed of the melting extruder 3 according to the pressure signal to ensure stable pressure when the added melt B enters the high-pressure gear pump;
(2) the high-pressure gear pump is mainly used for accurately metering and establishing high pressure for the added melt B so as to overcome the pressure of a main melt pipeline (namely the first pipeline 1) and ensure that the added melt B can be smoothly injected into the main melt pipeline; the high-pressure gear pump is controlled by a motor frequency converter, the frequency converter sets frequency according to the melt quantity of the added melt B to be injected, the added melt B with high pressure built is output to the injection valve 6 according to the set melt quantity, and the added melt B is injected into the main melt A in the first pipeline 1 through the injection valve 6 to obtain a two-component mixed melt; the injection valve needs to be opened when in injection and needs not to be closed when in injection;
Wherein the setting method of the melt amount of the added melt B comprises the following steps: collecting point X at output end of collecting injection valve 62The melt quantity signal of the two-component mixed melt and the collection point X2Feeding the melt quantity signal back to the PLC, and comparing the set value of the required two-component mixed melt with the collected melt quantity signal by the PLC to obtain the addition quantity of the melt B required to be added in real time; and the PLC controls a motor frequency converter of the high-pressure gear pump according to the addition amount, adjusts the rotating speed of the high-pressure gear pump, and correspondingly adjusts the injection amount of the added melt B in real time so as to ensure the stability of the mixing proportion of the main melt A and the added melt B.
Example 4:
a high-pressure melt injection method adopts the high-pressure body injection system described in the embodiment 2 to inject an additive melt B into a main melt A, wherein the main melt A is conveyed in a first pipeline 1, and the additive melt B is conveyed in a second pipeline 2; the method specifically comprises the following steps:
(1) adding a melt B, melting and extruding the melt B by a melting extruder 3, inputting the melt B into a second pipeline 2, designing a metering pump 4 on the second pipeline 2, wherein the metering pump 4 adopts a high-pressure gear pump in the embodiment, the input end of the high-pressure gear pump is provided with a first pressure sensor 5-1, and the output end of the high-pressure gear pump is provided with a second pressure sensor 5-2; the first pressure sensor 5-1 and the second pressure sensor 5-2 collect pressure signals of the input end and the output end of the high-pressure gear pump in real time and feed back the pressure signals to the PLC, the PLC controls a motor frequency converter of the melting extruder 3 according to the pressure signals of the input end and the output end of the high-pressure gear pump, the rotating speed of the melting extruder 3 is adjusted through the frequency converter of the motor, and the pressure value of the added melt B entering the high-pressure gear pump is ensured to be constant;
the first pressure sensor 5-1 and the second pressure sensor 5-2 are mainly used for collecting pressure signals of the input end and the output end of the high-pressure gear pump, and the pressure of the melt entering the high-pressure gear pump is unstable due to the fact that the pressure of the melt output by the melting extruder 3 is influenced by the extrusion speed of the melting extruder 3 and the like; in the embodiment, the pressure signal of the first pressure sensor 5-1 is transmitted to the PLC, and the PLC adjusts the extrusion speed of the melt extruder 3 according to the pressure signals of the input end and the output end of the high-pressure gear pump, so as to ensure stable pressure when the added melt B enters the high-pressure gear pump; meanwhile, a pressure signal at the output end of the high-pressure gear pump, which is acquired by the second pressure sensor 5-2, is transmitted to the PLC, the PLC compares the set value of the output end of the high-pressure gear pump with the pressure signal at the output end of the high-pressure gear pump, and the abnormity of the working state of the high-pressure gear pump can be judged according to the comparison result;
(2) The high-pressure gear pump is mainly used for accurately metering and establishing high pressure for the added melt B so as to overcome the pressure of a main melt pipeline (namely the first pipeline 1) and ensure that the added melt B can be smoothly injected into the main melt pipeline; the high-pressure gear pump is controlled by a motor frequency converter, the frequency converter sets frequency according to the melt quantity of the added melt B to be injected, the added melt B with high pressure built is output to the injection valve 6 according to the set melt quantity, and the added melt B is injected into the main melt A in the first pipeline 1 through the injection valve 6 to obtain a two-component mixed melt; the injection valve needs to be opened when in injection and needs not to be closed when in injection;
Wherein the setting method of the melt amount of the added melt B comprises the following steps: collecting point X on main melt pipeline at front end of collecting injection valve 61and a collection point X at the output end of the injection valve2and the collection point X1collection point X2The melt quantity signal is fed back to the PLC, and the PLC is provided with a collection point X1The melt quantity signal of the injection valve obtains a predicted value D of the output end of the injection valve, and the predicted value D and the acquisition point X are compared2The melt quantity signals are compared to obtain the real-time addition quantity of the added melt B, the PLC controls a motor frequency converter of the high-pressure gear pump according to the real-time addition quantity, the rotating speed of the high-pressure gear pump is adjusted, and the injection quantity of the added melt B is correspondingly adjusted in real time so as to ensure the stability of the mixing proportion of the main melt A and the added melt B. In the embodiment, the amount of the main melt before the injection of the additive melt and the amount of the mixed melt after the injection are collected and compared, so that the ratio of the main melt to the additive melt in the obtained mixed melt can be more accurately controlled, and the accuracy of the mixing ratio can basically reach one thousandth to two (namely, the metering accuracy of the metering pump).
Example 5:
A high-pressure melt injection method is the same as that of the embodiment 3 or the embodiment 4, except that a plurality of injection points can be arranged on the first pipeline 1 of the main melt A, each injection point is connected with a different pipeline for adding the melt, the arrangement of components on the pipeline for adding the melt is the same as that of the embodiments 1-4, and the injection method adopted by the embodiment 3 or the embodiment 4 is adopted as the control method for adding the melt.

Claims (10)

1. a high-pressure melt injection system comprising a first conduit (1) for conveying a main melt (a) and a second conduit (2) for conveying an additional melt (B); the input end of the second pipeline (2) is connected with the output end of the melting extruder (3), the output end of the second pipeline (2) is connected with an injection point on the first pipeline (1) through an injection valve (6), and the input end of the injection valve (6) is provided with a metering pump (4); the method is characterized in that: the first pipeline (1) is provided with a melt quantity signal acquisition point, the melt quantity signal acquisition point is connected with a controller, a control signal output end of the controller is connected with the metering pump (4), and the rotating speed of the metering pump (4) is adjusted on line in real time according to a signal value of the melt quantity signal acquisition point, so that the proportion of the added melt (B) injected into the main melt (A) is stable.
2. The high pressure melt injection system of claim 1, wherein: the melt quantity signal acquisition point is arranged on the first pipeline (1) at the rear end of the injection point and is used for acquiring the melt quantity signal of the mixed melt after the additive melt (B) is injected into the main melt (A).
3. The high pressure melt injection system of claim 1, wherein: the melt quantity signal acquisition points comprise a first acquisition point and a second acquisition point which are respectively arranged on the first pipeline (1) at the front end and the rear end of the injection point, and the first acquisition point and the second acquisition point respectively acquire melt quantity signals before and after the addition melt (B) is injected into the main melt (A).
4. a high pressure melt injection system as claimed in claim 1, 2 or 3, wherein: the input of measuring pump (4) sets up pressure stability control device, and pressure stability control device is including setting up in pressure sensor (5) that measuring pump (4) input is used for gathering measuring pump input pressure signal, the signal output part connection director of pressure sensor (5), the motor frequency converter of melting extruder (3) is connected to the control signal output part of controller, and the controller is according to the rotational speed of pressure signal control melting extruder (3), and the pressure value that makes add fuse-element (B) entering high-pressure gear pump is stable.
5. A high pressure melt injection system as claimed in claim 1, 2 or 3, wherein: the input of measuring pump (4) sets up pressure stability control device, pressure stability control device is including setting up first pressure sensor and the second pressure sensor in measuring pump (4) input and output respectively, the pressure signal of measuring pump (4) input and output is gathered respectively to first pressure sensor and second pressure sensor, first pressure sensor and second pressure sensor's signal output part connection director, the motor converter of melting extruder (3) is connected to the control signal output part of controller, the controller is according to the rotational speed of pressure signal control melting extruder (3), the pressure value that makes add fuse-element (B) entering high-pressure gear pump is stable.
6. The high pressure melt injection system of claim 1, wherein: the metering pump (4) adopts a high-pressure gear pump.
7. The high pressure melt injection system of claim 1, wherein: a plurality of injection points are arranged on the first pipeline (1), and each injection point is connected with an additive melt pipeline through an injection valve (4).
8. A high-pressure melt injection method is characterized by comprising the following steps:
(1) The added melt (B) is melted and extruded by a melting extruder (3) and is input into a second pipeline (2), and the added melt is metered by a metering pump (4) and then is injected into the main melt (A) in the first pipeline (1) by an injection valve (6);
(2) The injection proportion of the added melt (B) is controlled on line in real time by a controller, the controller collects melt quantity signals of melt quantity signal collection points at the rear end or/and the front end of an injection valve on the first pipeline (1), and the rotating speed of the metering pump is controlled according to the melt quantity signals, so that the real-time on-line adjustment of the injection quantity of the added melt (B) is realized, and the proportion of the added melt (B) injected into the main melt (A) is stable.
9. The high pressure melt injection method of claim 8, wherein: before the main melt (A) is input into the metering pump (4), pressure stability control is carried out, a pressure sensor acquires a pressure signal at the input end of the metering pump in real time and feeds the pressure signal back to the controller, and the controller controls the rotating speed of the melting extruder (3) according to the pressure signal, so that the pressure value before the added melt (B) enters the metering pump is stable.
10. The high pressure melt injection method of claim 8, wherein: before the main melt (A) is input into the metering pump (4), pressure stability control is carried out, pressure signals of the input end and the output end of the metering pump are collected in real time by a pressure sensor and fed back to a controller, and the controller controls the rotating speed of the melting extruder (3) according to the pressure signals, so that the pressure value before the added melt (B) enters the metering pump is stable.
CN201910688773.6A 2019-07-29 2019-07-29 High-pressure melt injection method and high-pressure melt injection system Pending CN110561715A (en)

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CN201910688773.6A CN110561715A (en) 2019-07-29 2019-07-29 High-pressure melt injection method and high-pressure melt injection system

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Application Number Priority Date Filing Date Title
CN201910688773.6A CN110561715A (en) 2019-07-29 2019-07-29 High-pressure melt injection method and high-pressure melt injection system

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CN110561715A true CN110561715A (en) 2019-12-13

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CN103140342A (en) * 2010-07-08 2013-06-05 嘉洛斯控股有限公司 Plastics processing method and apparatus
CN103395190A (en) * 2013-08-12 2013-11-20 广东达诚机械有限公司 Sheet extruding machine with melt pressure control system
CN203320192U (en) * 2013-03-22 2013-12-04 中国昆仑工程公司 Melt direct-spinning on-line addition system
CN206328500U (en) * 2016-12-01 2017-07-14 无锡聚新科技有限公司 The system that a kind of fused mass directly spinning adds a variety of functional agglomerates
CN109056082A (en) * 2018-08-20 2018-12-21 宁波卓成化纤有限公司 A kind of method for implanting of fused mass directly spinning functionality master batch list position equal and quantitative

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101303013A (en) * 2008-03-12 2008-11-12 大连橡胶塑料机械股份有限公司 Extrusion granulating machine unit gear pump speed control system
CN103140342A (en) * 2010-07-08 2013-06-05 嘉洛斯控股有限公司 Plastics processing method and apparatus
CN203320192U (en) * 2013-03-22 2013-12-04 中国昆仑工程公司 Melt direct-spinning on-line addition system
CN103395190A (en) * 2013-08-12 2013-11-20 广东达诚机械有限公司 Sheet extruding machine with melt pressure control system
CN206328500U (en) * 2016-12-01 2017-07-14 无锡聚新科技有限公司 The system that a kind of fused mass directly spinning adds a variety of functional agglomerates
CN109056082A (en) * 2018-08-20 2018-12-21 宁波卓成化纤有限公司 A kind of method for implanting of fused mass directly spinning functionality master batch list position equal and quantitative

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