CN114043703A - Control system for automatic vacuumizing of extruder - Google Patents
Control system for automatic vacuumizing of extruder Download PDFInfo
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- CN114043703A CN114043703A CN202111287960.7A CN202111287960A CN114043703A CN 114043703 A CN114043703 A CN 114043703A CN 202111287960 A CN202111287960 A CN 202111287960A CN 114043703 A CN114043703 A CN 114043703A
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- vacuum
- pressure value
- vacuum pump
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- vacuum pressure
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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
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a control system for automatic vacuumizing of an extruder, which comprises: the device comprises a vacuum measuring meter, a controller, a frequency converter, a vacuum pump and a vacuum gas storage tank; the vacuum degree measuring meter is used for measuring the current vacuum pressure value inside the rubber tube and sending the current vacuum pressure value to the controller; the controller is used for calculating the target rotating speed of the vacuum pump by using the current vacuum pressure value and sending the target rotating speed of the vacuum pump to the frequency converter; and the frequency converter is used for adjusting the actual rotating speed of the vacuum pump according to the target rotating speed of the vacuum pump so as to enable the vacuum pump to operate according to the target rotating speed, extract the air in the extruder head and discharge the air extracted from the extruder head to the vacuum air storage tank. The technical scheme that this application provided not only can let the user know the vacuum of rubber tube in real time, still improved the control accuracy of vacuum, saved power consumption to economic cost has been reduced.
Description
Technical Field
The invention belongs to the technical field of extruder control, and particularly relates to an automatic vacuumizing control system of an extruder.
Background
In the existing production line of the knitted rubber tube of the automobile, in order to meet the requirement of the explosion pressure of a host factory and make sealing, the air pressure between the inner layer rubber and the outer layer rubber in the rubber tube needs to be pumped out by a vacuum pump for tight adhesion, so that the rubber tube is kept to be tightly attached.
The traditional control mode for pumping the air pressure between the inner layer rubber and the outer layer rubber in the rubber pipe by a vacuum pump is as follows: 1) pressing a button of an operation box of the extruder; 2) closing a relay; 3) closing a contactor; 4) the vacuum pump rotates at a power frequency of 50 HZ. However, the traditional control method has the following disadvantages: 1) open loop control, no monitoring to the actual vacuum degree; 2) the electric energy consumption is too large; 3) the control precision is poor.
Disclosure of Invention
In view of the above, the present invention is directed to overcome the defects in the prior art, and provides a control system for automatically vacuumizing an extruder, so as to solve the problems of open-loop control, no monitoring of an actual vacuum degree, excessive power consumption, and poor control accuracy in the prior art.
According to a first aspect of embodiments of the present application, there is provided a control system for automatic vacuum pumping of an extruder, the system comprising: the device comprises a vacuum measuring meter, a controller, a frequency converter, a vacuum pump and a vacuum gas storage tank;
the vacuum degree measuring meter is used for measuring the current vacuum pressure value inside the rubber tube and sending the current vacuum pressure value to the controller;
the controller is used for calculating the target rotating speed of the vacuum pump by using the current vacuum pressure value and sending the target rotating speed of the vacuum pump to the frequency converter;
and the frequency converter is used for adjusting the actual rotating speed of the vacuum pump according to the target rotating speed of the vacuum pump so as to enable the vacuum pump to operate according to the target rotating speed, extract air in the extruder head and discharge the air extracted from the extruder head to the vacuum air storage tank.
Further, the controller is specifically configured to:
calculating an adjustment quantity by using the current vacuum pressure value based on a PID algorithm;
and calculating the target rotating speed of the vacuum pump by using the adjusting amount.
Further, the calculating the adjustment amount by using the current vacuum pressure value based on the PID algorithm includes:
the adjustment amount Δ V is calculated as follows:
ΔV＝PID/10 (1)
wherein, the PID adjustment amount is calculated according to the following formula:
PID＝Uk+KP*[E(n)-E(n-1)]+KI*E(n)+KD*[E(n)-2E(n-1)+E(n-2)] (2)
in the above formula, the divisor 10 in formula (1) is represented by HZ, and the adjustment amount Δ V is represented by HZ; n belongs to [1, N ], and N is the total sampling times; KP is proportion, KI is integral, KD is differential, E (n) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth sampling measurement, E (n-1) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth sampling measurement, E (n-2) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth-2 sampling measurement, and Uk is the last PID adjustment quantity.
Further, the calculating the target rotation speed of the vacuum pump by using the adjustment amount includes:
calculating a target rotation speed V of the vacuum pump according to the following formula:
V＝30+ΔV (3)
in the above formula, the unit of the addend 30 is HZ, and Δ V is the adjustment amount.
Further, the upper limit value of the target rotation speed of the vacuum pump is 50HZ, and the lower limit value of the target rotation speed of the vacuum pump is 0 HZ.
Further, the system further comprises:
and the touch screen is used for inputting information and displaying the current vacuum pressure value and the target vacuum pressure value.
Further, the controller performs information interaction with the frequency converter through an RS485 communication protocol.
By adopting the technical scheme, the invention can achieve the following beneficial effects: the vacuum degree measuring meter is used for measuring the current vacuum pressure value inside the rubber tube, the controller utilizes the current vacuum pressure value to calculate the target rotating speed of the vacuum pump, the frequency converter adjusts the actual rotating speed of the vacuum pump according to the target rotating speed of the vacuum pump, so that the vacuum pump operates according to the target rotating speed, the air inside the extruder head is extracted, the air extracted from the inside of the extruder head is discharged to the vacuum air storage tank, the vacuum degree of the rubber tube can be known by a user in real time, the control precision of the vacuum degree is improved, the electric energy consumption is saved, and the economic cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a control system for automatically evacuating an extruder according to an exemplary embodiment;
FIG. 2 is a schematic diagram of a touch screen shown in accordance with an exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a schematic structural diagram illustrating a control system for automatically evacuating an extruder according to an exemplary embodiment, as shown in fig. 1, the system including: a vacuum measuring gauge 11, a controller 12, a frequency converter 13, a vacuum pump 14 and a vacuum gas storage tank 15;
the vacuum degree measuring meter is used for measuring the current vacuum pressure value inside the rubber tube and sending the current vacuum pressure value to the controller 12;
the controller 12 is configured to calculate a target rotation speed of the vacuum pump 14 by using the current vacuum pressure value, and send the target rotation speed of the vacuum pump 14 to the frequency converter 13;
and the frequency converter 13 is used for adjusting the actual rotating speed of the vacuum pump 14 according to the target rotating speed of the vacuum pump 14, so that the vacuum pump 14 operates according to the target rotating speed, the air in the head of the extruder 17 is extracted, and the air extracted from the head of the extruder 17 is discharged to the vacuum storage tank 15.
It should be noted that the type of the controller 12 may be, but is not limited to, a Programmable Logic Controller (PLC), and the type of the PLC may be, but is not limited to, a mitsubishi motor Q02 CPU. The vacuum measuring gauge 11 may be, but is not limited to, model PT124B-ZH-560A- (-0.1-0) MPA-4-20 MA. The frequency converter 13 may be, but is not limited to, a type of mitsubishi motor a 740. The vacuum pump 14 may be of a type that is not limited to Shanghai second vacuum pump 14 plant XD 60. The vacuum accumulator tank 15 may be, but is not limited to, 400L in volume.
It can be understood that the frequency converter 13 adjusts the actual rotation speed of the vacuum pump 14 according to the target rotation speed of the vacuum pump 14, so that the vacuum pump 14 operates according to the target rotation speed, and the air inside the head of the extruder 17 is extracted, so that a vacuum negative pressure state is formed inside the head of the extruder 17, the adhesion degree of the inner wall and the outer wall of the rubber tube is enhanced, and meanwhile, the vacuum pump 14 discharges the extracted air into the vacuum air storage tank 15, so that the buffer is formed through the vacuum air storage tank 15, and the stability of the vacuum degree is maintained.
According to the control system for automatic vacuum pumping of the extruder, provided by the embodiment of the invention, the current vacuum pressure value in the rubber tube is measured through the vacuum degree measuring meter, the controller 12 calculates the target rotating speed of the vacuum pump 14 by using the current vacuum pressure value, and the frequency converter 13 adjusts the actual rotating speed of the vacuum pump 14 according to the target rotating speed of the vacuum pump 14, so that the vacuum pump 14 runs according to the target rotating speed, air in the head of the extruder 17 is extracted, and the air extracted from the head of the extruder 17 is discharged to the vacuum storage tank 15.
Further, the controller 12 is specifically configured to:
calculating an adjustment quantity by using the current vacuum pressure value based on a PID algorithm;
the target rotational speed of the vacuum pump 14 is calculated using the adjustment amount.
It should be noted that PID Control, namely, proportionality (p) -integral (i) -deviation (d) Control, is actually three feedback controls: proportional control, integral control and derivative control. Depending on the control object and the application conditions, a partial combination of these three controls, i.e., P control, PI control, PD control, or a combination of the three, i.e., true PID control, may be used.
It should be noted that, after the controller 12 calculates the adjustment amount, the adjustment amount may be stored in a register inside the controller 12.
It can be understood that, after the current vacuum pressure value measured by the vacuum gauge 11 is an analog signal and is transmitted to the controller 12, an analog-to-digital conversion module inside the controller 12 converts the current vacuum pressure value from the analog signal to a digital signal, so as to convert the current vacuum pressure value into a form that can be recognized by the controller 12.
Further, based on the PID algorithm, the adjustment amount is calculated by using the current vacuum pressure value, and the method comprises the following steps:
the adjustment amount Δ V is calculated as follows:
ΔV＝PID/10 (1)
wherein, the PID adjustment amount is calculated according to the following formula:
PID＝Uk+KP*[E(n)-E(n-1)]+KI*E(n)+KD*[E(n)-2E(n-1)+E(n-2)] (2)
in the above formula, the divisor 10 in formula (1) is represented by HZ, and the adjustment amount Δ V is represented by HZ; n belongs to [1, N ], and N is the total sampling times; KP is proportion, KI is integral, KD is differential, E (n) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth sampling measurement, E (n-1) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth sampling measurement, E (n-2) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth-2 sampling measurement, and Uk is the last PID adjustment quantity.
It will be appreciated that the adjustment Δ V is essentially an adjustment of the rotational speed of the vacuum pump; the PID adjustment is calculated by a PID algorithm, is only a numerical value but has no unit, and is converted into the vacuum pump rotating speed adjustment, so that the vacuum pump rotating speed adjustment needs to be divided by 10 HZ.
It should be noted that the target vacuum pressure value is preset, and the preset target vacuum pressure value is not limited in the embodiment of the present invention, and a person skilled in the art may set the target vacuum pressure value according to experimental data or actual requirements.
In some embodiments, the sampling time in the PID algorithm may be, but is not limited to, 50ms, the proportional KP may be, but is not limited to, set to 1%, the integral KI may be, but is not limited to, set to 100ms, and the differential KD may be, but is not limited to, set to 0 ms.
Further, calculating the target rotation speed of the vacuum pump 14 using the adjustment amount includes:
the target rotational speed V of the vacuum pump 14 is calculated as follows:
V＝30+ΔV (3)
in the above formula, the unit of the addend 30 is HZ, and Δ V is the adjustment amount.
Specifically, the upper limit value of the target rotational speed of the vacuum pump 14 is 50HZ, and the lower limit value of the target rotational speed of the vacuum pump 14 is 0 HZ.
It can be understood that the adjustment amount is automatically calculated by setting the target vacuum pressure value of the vacuum pump 14 and then using the controller 12 based on the PID algorithm according to the target vacuum pressure value and the current vacuum pressure value of the vacuum pump 14, so that the target rotating speed of the vacuum pump 14 is further calculated, the automatic control of the vacuum degree is realized, unnecessary energy consumption caused by the fact that the vacuum pump always rotates at the power frequency of 50HZ in the prior art is avoided, the electric energy consumption is reduced, and the economic cost is saved.
Further, the system further comprises:
and the touch screen 16 is used for information input and displaying the current vacuum pressure value and the target vacuum pressure value.
In some alternative embodiments, the target vacuum pressure value may be, but is not limited to, 0.06MPa 10 kPa. The user may set a target vacuum pressure value via the touch screen 16. It can be understood that, a user sets a target vacuum pressure value through the touch screen 16 according to actual requirements, and then the final target rotating speed of the vacuum pump is calculated through the control system for automatically vacuumizing the extruder provided by the embodiment of the invention, so that the vacuum pump operates according to the target rotating speed, the control precision of the vacuum degree is improved, and the user experience is also improved; meanwhile, the vacuum pump operates according to the target rotating speed, so that the power frequency of the vacuum pump corresponds to the target rotating speed and is stable, and the vacuum pump does not always rotate at the power frequency of 50HZ like the prior art, so that unnecessary electric energy consumption is reduced, and the economic cost is saved.
Specifically, optionally, the touch screen 16 is further configured to display information of a control system for automatic vacuum pumping of the extruder, for example, as shown in fig. 2, a vacuum set value in a lower right side of the touch screen 16 is a target vacuum pressure value, and a vacuum measurement value is a current vacuum pressure value; the rotation speed at the upper left of the touch screen 16 is the screw rotation speed.
In some embodiments, the touch screen 16 may be, but is not limited to, an industrial touch screen such as Mitsubishi Motor GS 2010.
Further, the controller 12 performs information interaction with the frequency converter 13 through an RS485 communication protocol.
According to the control system for automatic vacuum pumping of the extruder, provided by the embodiment of the invention, the current vacuum pressure value in the rubber tube is measured through the vacuum degree measuring meter, the controller 12 calculates the target rotating speed of the vacuum pump 14 by using the current vacuum pressure value, and the frequency converter 13 adjusts the actual rotating speed of the vacuum pump 14 according to the target rotating speed of the vacuum pump 14, so that the vacuum pump 14 runs according to the target rotating speed, air in the head of the extruder 17 is extracted, and the air extracted from the head of the extruder 17 is discharged to the vacuum storage tank 15.
To further explain the control system for automatic vacuum pumping of the extruder provided by the above embodiment, the embodiment of the present invention further provides a control method for the control system for automatic vacuum pumping of the extruder, which can be but is not limited to be used for a terminal, and the method includes the following steps:
step 101: measuring the current vacuum pressure value inside the rubber tube by using a vacuum degree measuring meter 11, and sending the current vacuum pressure value to a controller 12;
step 102: the controller 12 calculates a target rotating speed of the vacuum pump 14 by using the current vacuum pressure value, and sends the target rotating speed of the vacuum pump to the frequency converter 13;
step 103: the frequency converter 13 adjusts the actual rotating speed of the vacuum pump 14 according to the target rotating speed of the vacuum pump, so that the vacuum pump 14 operates according to the target rotating speed;
step 104: the vacuum pump 14 draws air inside the head of the extruder 17 and discharges the air drawn from the inside of the head of the extruder 17 to the vacuum reservoir 15.
Further, in step 102, the controller 12 calculates a target rotation speed of the vacuum pump 14 by using the current vacuum pressure value, including:
step 1021: calculating an adjustment quantity by using the current vacuum pressure value based on a PID algorithm;
step 1022: the target rotational speed of the vacuum pump 14 is calculated using the adjustment amount.
Further, step 1021 comprises:
the adjustment amount Δ V is calculated as follows:
ΔV＝PID/10 (1)
wherein, the PID adjustment amount is calculated according to the following formula:
PID＝Uk+KP*[E(n)-E(n-1)]+KI*E(n)+KD*[E(n)-2E(n-1)+E(n-2)] (2)
in the above formula, the divisor 10 in formula (1) is represented by HZ, and the adjustment amount Δ V is represented by HZ; n belongs to [1, N ], and N is the total sampling times; KP is proportion, KI is integral, KD is differential, E (n) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth sampling measurement, E (n-1) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth sampling measurement, E (n-2) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth-2 sampling measurement, and Uk is the last PID adjustment quantity.
In some embodiments, the sampling time in the PID algorithm may be, but is not limited to, 50ms, the proportional KP may be, but is not limited to, set to 1%, the integral KI may be, but is not limited to, set to 100ms, and the differential KD may be, but is not limited to, set to 0 ms.
Further, step 1022 includes:
the target rotational speed V of the vacuum pump 14 is calculated as follows:
V＝30+ΔV (3)
in the above formula, the unit of the addend 30 is HZ, and Δ V is the adjustment amount.
Specifically, the upper limit value of the target rotational speed of the vacuum pump 14 is 50HZ, and the lower limit value of the target rotational speed of the vacuum pump 14 is 0 HZ.
According to the control method for automatic vacuum pumping of the extruder provided by the embodiment of the invention, the current vacuum pressure value inside the rubber tube is measured through the vacuum degree measuring meter, the controller 12 calculates the target rotating speed of the vacuum pump 14 by using the current vacuum pressure value, the frequency converter 13 adjusts the actual rotating speed of the vacuum pump 14 according to the target rotating speed of the vacuum pump 14, so that the vacuum pump 14 runs according to the target rotating speed, air inside the head of the extruder 17 is extracted, and the air extracted from the head of the extruder 17 is discharged to the vacuum storage tank 15, so that a user can know the vacuum degree of the rubber tube in real time, the control precision of the vacuum degree is improved, the electric energy consumption is saved, and the economic cost is reduced.
It is understood that, in the embodiments provided above, the corresponding specific contents may be referred to each other, and are not described herein again.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A control system for automatic vacuum pumping of an extruder, the system comprising: the device comprises a vacuum measuring meter, a controller, a frequency converter, a vacuum pump and a vacuum gas storage tank;
the vacuum degree measuring meter is used for measuring the current vacuum pressure value inside the rubber tube and sending the current vacuum pressure value to the controller;
the controller is used for calculating the target rotating speed of the vacuum pump by using the current vacuum pressure value and sending the target rotating speed of the vacuum pump to the frequency converter;
and the frequency converter is used for adjusting the actual rotating speed of the vacuum pump according to the target rotating speed of the vacuum pump so as to enable the vacuum pump to operate according to the target rotating speed, extract air in the extruder head and discharge the air extracted from the extruder head to the vacuum air storage tank.
2. The system of claim 1, wherein the controller is specifically configured to:
calculating an adjustment quantity by using the current vacuum pressure value based on a PID algorithm;
and calculating the target rotating speed of the vacuum pump by using the adjusting amount.
3. The system of claim 2, wherein the calculating an adjustment amount using the current vacuum pressure value based on the PID algorithm comprises:
the adjustment amount Δ V is calculated as follows:
ΔV＝PID/10 (1)
wherein, the PID adjustment amount is calculated according to the following formula:
PID＝Uk+KP*[E(n)-E(n-1)]+KI*E(n)+KD*[E(n)-2E(n-1)+E(n-2)] (2)
in the above formula, the divisor 10 in formula (1) is represented by HZ, and the adjustment amount Δ V is represented by HZ; n belongs to [1, N ], and N is the total sampling times; KP is proportion, KI is integral, KD is differential, E (n) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth sampling measurement, E (n-1) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth sampling measurement, E (n-2) is the difference value of the current vacuum pressure value and the target vacuum pressure value of the nth-2 sampling measurement, and Uk is the last PID adjustment quantity.
4. The system of claim 2, wherein said calculating a target rotational speed of a vacuum pump using said adjustment amount comprises:
calculating a target rotation speed V of the vacuum pump according to the following formula:
V＝30+ΔV (3)
in the above formula, the unit of the addend 30 is HZ, and Δ V is the adjustment amount.
5. The system according to claim 4, wherein an upper limit value of the target rotation speed of the vacuum pump is 50HZ, and a lower limit value of the target rotation speed of the vacuum pump is 0 HZ.
6. The system of claim 1, further comprising:
and the touch screen is used for inputting information and displaying the current vacuum pressure value and the target vacuum pressure value.
7. The system of claim 1, wherein the controller interacts with the transducer via an RS485 communication protocol.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111287960.7A CN114043703A (en) | 2021-11-02 | 2021-11-02 | Control system for automatic vacuumizing of extruder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111287960.7A CN114043703A (en) | 2021-11-02 | 2021-11-02 | Control system for automatic vacuumizing of extruder |
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2021
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| US3725178A (en) * | 1970-11-13 | 1973-04-03 | V Browning | Apparatus for continuously manufactured flexible conduit |
| CN102452177A (en) * | 2010-10-21 | 2012-05-16 | 王东奎 | Braided rubber tube automatic-controlled linkage-production method and apparatus thereof |
| CN202468394U (en) * | 2011-12-30 | 2012-10-03 | 广东联塑机器制造有限公司 | Frequency conversion energy-saving control system of vacuum pump on plastic extrusion equipment |
| CN106382212A (en) * | 2015-08-02 | 2017-02-08 | 山东光华纸业集团有限公司 | Pics vacuum pump pressure stabilizing system |
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