CN215661787U - Screw extruder - Google Patents
Screw extruder Download PDFInfo
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- CN215661787U CN215661787U CN202120773411.XU CN202120773411U CN215661787U CN 215661787 U CN215661787 U CN 215661787U CN 202120773411 U CN202120773411 U CN 202120773411U CN 215661787 U CN215661787 U CN 215661787U
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Abstract
The application discloses screw extruder, including the aircraft nose, the motor of transmission connection on the screw rod of screw rod, the ejection of compact and be used for monitoring and control extruder's control system, control system includes: the device comprises a touch screen for displaying and presetting process parameters, an encoder arranged on a screw and used for transmitting screw rotating speed information, a frequency converter used for controlling the rotating speed of a motor, a first sensor arranged on a machine head and used for detecting the pressure of the machine head, an expansion circuit and a programmable controller; the expansion circuit comprises an analog input module and an analog output module which are used for controlling the frequency converter to adjust the rotating speed of the motor; the programmable controller is in communication connection with the touch screen, the encoder and the expansion circuit. The programmable controller is used for collecting the pulse of the encoder, so that the high-precision monitoring of the rotating speed of the screw rod is realized; PID operation is carried out through a pressure closed loop of the programmable controller and the expansion circuit, an analog quantity signal is sent to the frequency converter, the frequency converter is driven to change the rotating speed of the motor, constant output of closed loop pressure is achieved, and stability of the whole production process is guaranteed.
Description
Technical Field
The application relates to the technical field of extruders, in particular to a screw extruder.
Background
In industrial machinery for producing plastic products, extruders are widely used in chemical fiber production lines, sheet production lines, pipe production lines, profile production lines, etc., extruders are important equipments for plastic extrusion production and processing, and most of plastic products are processed by extruders.
In the plastic extrusion production process, the rotating speed of the extruder has direct influence on the actual yield, so the rotating speed of a screw of the extruder is the key for determining the product yield; the rotating speed of the screw is controlled by a driving motor of a frequency converter, and the extrusion production process has strict requirements on the precision and the stability of the speed control of the extruder.
In the current market, extruder equipment has the problems of inaccurate speed control, large pressure fluctuation, non-maximized yield and the like in practical application, thereby causing cost waste.
Disclosure of Invention
The application aims to solve the problems that in the prior art, speed control is not accurate, pressure fluctuation is large, and yield cannot be maximized.
In order to achieve the purpose, the technical scheme is as follows: a screw extruder comprising a screw, a motor drivingly connected to the screw and a control system for monitoring and controlling the extruder, the screw extruder having a head for discharging material, the control system comprising:
the touch screen is used for displaying and presetting various process parameters of the screw extruder, and the process parameters at least comprise extrusion pressure parameters;
the encoder is arranged on the screw and used for feeding back the monitored rotating speed information of the screw to the outside in a pulse mode;
the frequency converter is in signal connection with the motor and is used for adjusting the rotating speed of the motor;
the first sensor is arranged at the handpiece and used for detecting the pressure of the handpiece in real time and feeding back the detected pressure information to the outside;
the expansion circuit comprises an analog quantity input module and an analog quantity output module which are in signal connection with the frequency converter, and the analog quantity input module is in signal connection with the first sensor; the analog quantity output module is used for controlling the frequency converter to adjust the rotating speed of the motor, and,
the programmable controller is in communication connection with the touch screen, the encoder and the expansion circuit, and is configured to receive rotating speed information fed back by the encoder, the programmable controller comprises a PID arithmetic unit, the PID arithmetic unit is in signal connection with the analog input module and the analog output module, and the PID arithmetic unit is used for performing PID operation according to the difference value between the pressure information converted by the analog input module and the extrusion pressure parameter and outputting an operation result.
In the above technical solution, it is further preferable that the screw extruder has a plurality of heating zones and a plurality of heaters respectively disposed in the plurality of heating zones, and the plurality of heating zones are sequentially distributed along an axial line extending direction of the screw.
In the above technical solution, it is further preferable that the control system further includes a plurality of second sensors, the plurality of second sensors are respectively disposed in the plurality of heating areas, and each of the second sensors is configured to detect a temperature in the corresponding heating area and feed back detected temperature information to the outside.
In the above technical solution, it is further preferable that the expansion circuit further includes a temperature input module and a digital quantity module, the temperature input module is in signal connection with the second sensor, and the digital quantity module is in signal connection with the plurality of heaters to control on and off of the plurality of heaters; the process parameters also comprise temperature parameters; the temperature input module is used for feeding back the temperature information collected by the second sensor to the programmable controller and comparing the temperature information with the temperature parameter, and the digital quantity module is used for controlling the on and off of the heater according to the comparison result.
Compared with the prior art, the invention has the following beneficial effects:
the method and the device have the advantages that the programmable controller is used for collecting the pulse of the encoder, so that the high-precision monitoring of the rotating speed of the screw rod is realized; PID operation is carried out through a pressure closed loop of the programmable controller and the expansion circuit, an analog quantity signal is sent to the frequency converter, the frequency converter is driven to change the rotating speed of the motor, constant output of closed loop pressure is achieved, and stability of the whole production process is guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
fig. 2 is a schematic flow chart of the present application.
Detailed Description
To explain technical contents, structural features, achieved objects and effects of the invention in detail, the technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. Moreover, the various exemplary embodiments may be different, but are not necessarily exclusive. For example, the particular shapes, configurations and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.
As shown in fig. 1, a screw extruder of the present application has a control system 10, and the automatic production is realized by the control system 10. The screw extruder 20 further comprises a plurality of heating zones 202, a plurality of heaters 203 respectively arranged in each heating zone 202, a machine head 201 for discharging, a screw 21 and a motor 22 in transmission connection with the screw 21; the motor 22 drives the screw 21 to rotate around the axis direction of the screw, and the heating zones 202 are sequentially distributed along the extension direction of the axis of the screw 21; the control system 10 is used to monitor and control the rotational speed, extrusion pressure and heating temperature of the screw extruder 20.
The control system 10 comprises a touch screen 1, a programmable controller 2, an expansion circuit 3, an encoder 4, a frequency converter 5, a first sensor 6 and a plurality of second sensors 7; the programmable controller 2 is in communication connection with the touch screen 1 and mutually transmits data with the touch screen 1; the frequency converter 5 is in signal connection with the motor 22, and the frequency converter 5 controls the rotating speed of the motor 22.
The touch screen 1 is used for displaying parameter information fed back by the programmable controller 2 and the expansion circuit 3, and a user can preset process parameters through the touch screen 1, wherein the process parameters at least comprise extrusion pressure parameters and temperature parameters. Preferably, the touch screen 1 is in a Kunlun standard TPC1071 GI.
The encoder 4 is arranged on the screw 21 and is in signal connection with the programmable controller 2, and the encoder 4 transmits the rotating speed information of the screw 21 to the programmable controller in the form of pulses.
The programmable controller 2 is in signal connection with the expansion circuit 3, the programmable controller 2 transmits the received rotating speed information to the touch screen 1, and the rotating speed information is displayed by the touch screen 1, so that the output of the screw extruder 20 under different rotating speed information of the screw 21 can be conveniently recorded. Preferably, the programmable controller 2 and the expansion circuit 3 adopt the series of the letter CTS 7-200.
The first sensor 6 is disposed at the head 201 of the screw extruder 20, and is configured to detect a pressure at the head 201 and feed back collected pressure information to the outside.
The plurality of second sensors 7 are respectively disposed in the heating zones 202 of the screw extruder 20, and are configured to detect the temperature of each heating zone 202 and feed back collected temperature information to the outside.
As shown in fig. 1 and 2, the expansion circuit 3 comprises a temperature input module 32 and a digital quantity module 31 for detecting and controlling the temperature of each heating zone of the screw extruder 20, an analog quantity input module 33 and an analog quantity output module 34 for controlling and adjusting the rotating speed of the motor 22, and the analog quantity input module 33 and the analog quantity output module 34 are in signal connection with the frequency converter 5. The programmable controller 2 is in signal connection with each module in the expansion circuit 3.
The temperature input module 32 is in signal connection with the plurality of second sensors 7, and the temperature input module 32 converts the temperature information transmitted by the second sensors 7 from analog quantity signals into digital quantity signals and feeds the digital quantity signals back to the programmable controller 2.
The digital quantity module 31 is in signal connection with the plurality of heaters 203, and the digital quantity module 31 controls the on and off of each heater 203.
The analog quantity input module 33 is in signal connection with the first sensor 6, and the analog quantity input module 33 converts the pressure information transmitted by the first sensor 6 from an analog quantity signal to a digital quantity signal and feeds the digital quantity signal back to the programmable controller 2.
The analog quantity output module 34 controls the frequency converter 5 to drive the motor 22 to change the speed.
The programmable controller 2 reads the temperature information converted by the temperature input module 32 and compares the temperature information with the temperature parameter read from the touch screen 1, and if the temperature information reaches the temperature parameter, the heater 203 of the corresponding heating area 202 is controlled to be turned off by the digital quantity module 31; if the temperature information does not reach the temperature parameter, the heater 203 corresponding to the heating area 202 continues to perform the heating operation.
The programmable controller 2 reads the pressure information converted by the analog input module 33 and compares the pressure information with the extrusion pressure parameter read from the touch screen 1, PID operation is carried out on the deviation of the pressure information and the extrusion pressure parameter, the analog output module 34 converts the operation result and outputs the converted operation result to the frequency converter 5, and the frequency converter 5 controls the motor 22 to change the speed so as to achieve the purpose of changing the rotating speed of the screw 21. The pressure information at the head 201 is stabilized at the preset extrusion pressure parameters, thereby ensuring the quality and yield of the product.
The working principle is as follows: inputting the temperature parameter T of each heating area 202 on the touch screen 10And the temperature parameter T is measured0Transmitting to the programmable controller 2, starting the screw extruder 20; the encoder 4 transmits the rotation speed information V of the screw 211To the programmable controller 2; the first sensor 6 will detect the pressure information P at the handpiece 2011The analog quantity is converted by the analog quantity input module 33 and then fed back to the programmable controller 2; the temperature information T of each heating area 202 to be detected by the plurality of second sensors 71The temperature is converted by the temperature input module 32 and then fed back to the programmable controller 2; the programmable controller 2 transmits the temperature information T1Temperature regulationDegree parameter T0Comparing, the temperature information T is obtained by the digital quantity module 311To a temperature parameter T0The heater 203 of the heating area 202 is turned off, and the heater 203 that has not reached continues the heating operation. The programmable controller 2 receives the pressure information P1Temperature information T1And detected rotational speed information V1Transmitted to the touch screen 1, displayed by the touch screen 1 and recorded with the rotating speed information V of different screws 21120-value highest output D of lower screw extruder1And corresponding pressure information P1(ii) a All the rotating speed information V is obtained1Yield of1Comparing to obtain the maximum yield DMaxAt the maximum yield DMaxMaximum production pressure P ofMaxThe maximum production pressure PMaxInputting preset parameters from the touch screen 1, and the programmable controller 2 processes the pressure information P1And maximum production pressure PMaxPerforms PID operation on the deviation, transmits the operation result to the frequency converter 5 through the analog output module 34, and the frequency converter 5 controls the rotating speed of the motor 22 to enable the pressure information P at the head 2011Maintained at maximum production pressure PMaxThe screw extruder 20 maintains a maximum throughput while the head 201 pressure is constant.
The method and the device realize high-precision monitoring of the rotating speed of the screw by acquiring the pulse of the encoder 4 through the programmable controller 2; through the pressure closed-loop PID operation of the programmable controller 2 and the expansion circuit 3 and the sending of an analog quantity signal to the frequency converter 5, the frequency converter 5 is driven to change the rotating speed of the motor 22, the constant output of the closed-loop pressure is realized, and the stability of the whole production process is ensured.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification, and equivalents thereof.
Claims (4)
1. Screw extruder comprising a screw (21), a motor (22) drivingly connected to the screw (21), and a control system (10) for monitoring and controlling the screw extruder (20), the screw extruder (20) further having a head (201) for discharging, characterized in that the control system (10) comprises:
the touch screen (1) is used for displaying and presetting various process parameters of the screw extruder (20), and the process parameters at least comprise extrusion pressure parameters;
the encoder (4) is arranged on the screw (21) and used for feeding back the monitored rotating speed information of the screw (21) to the outside in a pulse mode;
the frequency converter (5) is in signal connection with the motor (22) and is used for adjusting the rotating speed of the motor (22);
the first sensor (6) is arranged at the handpiece (201) and is used for detecting the pressure of the handpiece (201) in real time and feeding back the detected pressure information to the outside;
the expansion circuit (3) comprises an analog quantity input module (33) and an analog quantity output module (34) which are in signal connection with the frequency converter (5), and the analog quantity input module (33) is in signal connection with the first sensor (6); the analog quantity output module (34) is used for controlling the frequency converter (5) to adjust the rotating speed of the motor (22),
the programmable controller (2) is in communication connection with the touch screen (1), the encoder (4) and the expansion circuit (3), the programmable controller (2) is configured to receive rotating speed information fed back by the encoder (4), the programmable controller (2) comprises a PID operator, the PID operator is in signal connection with the analog input module (33) and the analog output module (34), and the PID operator is used for performing PID operation according to the difference value between the pressure information converted by the analog input module (33) and the extrusion pressure parameter and outputting an operation result.
2. Screw extruder according to claim 1, wherein the screw extruder (20) has a plurality of heating zones (202) and a plurality of heaters (203) respectively arranged in the plurality of heating zones (202), and the plurality of heating zones (202) are sequentially distributed along the axial center line extension direction of the screw (21).
3. Screw extruder according to claim 2, wherein the control system (10) further comprises a plurality of second sensors (7), the plurality of second sensors (7) are respectively arranged in a plurality of heating zones (202), and each second sensor (7) is used for detecting the temperature in the corresponding heating zone (202) and feeding back the detected temperature information to the outside.
4. Screw extruder according to claim 3, wherein the expansion circuit (3) further comprises a temperature input module (32) and a digital quantity module (31), the temperature input module (32) being in signal connection with the second sensor (7), the digital quantity module (31) being in signal connection with the plurality of heaters (203) for controlling the plurality of heaters (203) to be switched on and off; the process parameters also comprise temperature parameters; the temperature input module (32) is used for feeding back the temperature information collected by the second sensor (7) to the programmable controller (2) and comparing the temperature information with the temperature parameter, and the digital quantity module (31) is used for controlling the on and off of the heater (203) according to the comparison result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120773411.XU CN215661787U (en) | 2021-04-15 | 2021-04-15 | Screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120773411.XU CN215661787U (en) | 2021-04-15 | 2021-04-15 | Screw extruder |
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| Publication Number | Publication Date |
|---|---|
| CN215661787U true CN215661787U (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120773411.XU Active CN215661787U (en) | 2021-04-15 | 2021-04-15 | Screw extruder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114851518A (en) * | 2022-03-21 | 2022-08-05 | 广东三优聚合物装备有限公司 | Intelligent operating system for extruder |
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2021
- 2021-04-15 CN CN202120773411.XU patent/CN215661787U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114851518A (en) * | 2022-03-21 | 2022-08-05 | 广东三优聚合物装备有限公司 | Intelligent operating system for extruder |
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