CN113091618B - Photoelectric suspension system for crosslinked cable production line - Google Patents

Abstract

The invention discloses a photoelectric suspension system for a crosslinked cable production line, which belongs to the technical field of instruments and meters and measurement, and comprises a laser transmitter group, a numerical control analog switch array and an MCU (microprogrammed control unit); the laser emitter array emits a pulse point light source, light is adjusted into parallel light through an optical lens and vertically passes through an alumina pipeline, when the position of a cross-linked polyethylene cable in the alumina pipeline changes, the light can be shielded, signals generated by a linear array photodiode are converted into digital signals for recording a photodiode switch, an MCU (micro control unit) is used for carrying out a series of operations on the signals, the digital signals are transmitted to a driver as a lower traction rotating speed increment, the rotating speed is transmitted to lower traction, and the polyethylene cable moves forwards in the center of the alumina pipeline; the optical suspension system can realize the position control of the cable in the alumina pipeline, and has the advantages of simple and easy realization, strong anti-interference capability, high precision, high sensitivity, high visibility, high stability and low cost.

Description

Photoelectric suspension system for crosslinked cable production line

Technical Field

The invention belongs to the technical field of instruments and meters and measurement, and particularly relates to a photoelectric suspension system for a crosslinked cable production line.

Background

The crosslinked cable production line utilizes a three-layer catenary method to produce polyethylene cables, namely polyethylene materials are extruded simultaneously through three extruders, heated in a sealing machine to form a peripheral layer wrapping copper wires, and then sent to a heating section catenary pipeline, and a heating section heats a three-material mixed insulating layer of a half-and-half forming line to enable the three materials to be uniformly fused. And then, a cooling section catenary pipeline is cooled to form a forming line, and in order to prevent the cable from deviating from the center and rubbing the pipeline to cause the quality problem of a finished product, a suspension controller is required to be adopted to control the position of the cable.

The common suspension controller consists of a transmitting control cabinet, a transmitting coil, a receiving control cabinet, a receiving coil, a connecting cable and the like. Firstly, a signal generating circuit in a transmitting controller generates a high-frequency sinusoidal signal with a certain frequency, the high-frequency sinusoidal signal is subjected to voltage amplification and power amplification and is connected into a transmitting coil, a same-frequency alternating annular magnetic field is generated in the transmitting coil, a cable in a vulcanization tube penetrates through the transmitting coil, namely penetrates through the annular magnetic field, and the cable generates an induced potential. The cable core and its distributed capacitance to the vulcanizing tube (ground) and its distributed capacitance to the vulcanizing tube form a loop, and a high-frequency current flows through the cable core to generate a high-frequency magnetic field, which just passes through a group of receiving coils installed in the vulcanizing tube. The receiving coil cuts the magnetic line of force, and an induced potential with a certain frequency is generated in the receiving coil. When the cable is positioned at the center of the vulcanizing pipe, the induction signals of the upper receiving coil and the lower receiving coil are equal. Otherwise, the sensing signals are not equal. The coil signal close to the cable is large, the coil signal far away from the cable is small, the PLC collects the induction signals of the two receiving coils, the position of the cable in the vulcanizing pipeline can be analyzed through certain algorithm and processing, the analog quantity of the position of the cable is given, the direct current speed regulating device of the main electric control cabinet is given through the connecting cable, the rotating speed is dragged under the control, and the position of the cable in the pipeline is regulated. The cable position indication gauge reflects the relative position of the cable in the vulcanization tube on a scale, and the gauge head is indicated to be leftmost if the cable is positioned at the bottom of the vulcanization tube, to be in the middle if the cable is positioned at the middle of the vulcanization tube, and to be rightmost if the cable is positioned at the top of the vulcanization tube.

The existing suspension control system determines the position of a polyethylene cable in a pipeline through PLC (programmable logic controller) calculation according to the difference value of induced electromotive forces of a transmitting coil and a receiving coil, but the stability of the coil is greatly influenced by environmental factors such as temperature and humidity, and the anti-interference capability is poor. The PLC is used as an arithmetic unit, the calculation speed is low, the precision is influenced by the number of turns of the coil, the exciting current and the effective magnetic path length of the polyethylene cable in a magnetic field, and the precision is limited.

Disclosure of Invention

Aiming at the problems of poor anti-interference capability, low calculation speed, limited precision and the like of a common suspension controller in the prior art, the invention provides a photoelectric suspension system for a crosslinked cable production line. The method can realize the acquisition of pipeline position signals and the output of control signals by fully utilizing the integration and flexibility of the MCU, the photoelectric anti-interference performance of optical elements and simple peripheral circuits.

The invention is realized by the following technical scheme:

a photoelectric suspension system for a cross-linked cable production line comprises a laser emitter group 1, an optical lens 2, an alumina material pipeline 3, a cross-linked polyethylene cable 4, a linear array photodiode 5, a numerical control analog switch array 6, a power supply voltage conversion circuit 7, a voltage amplification circuit 8, a comparator circuit 9, an MCU10, a driver 11 and a lower traction 12; the laser emitter group 1 emits a pulse point light source, light is adjusted into parallel light after passing through the optical lens 2 and vertically passes through the alumina material pipeline 3, when the position of the crosslinked polyethylene cable 4 in the alumina material pipeline 3 changes, the light can be shielded, a part of the linear array photodiodes 5 can not receive optical signals, signals generated by the linear array photodiodes 5 are divided into two groups in the horizontal and vertical directions by taking the central axis of the cross section of the alumina material pipeline 3 as a boundary, four groups of current signals are obtained, the horizontal direction is one group and two groups, the vertical direction is recorded as three groups and four groups, the four groups of current signals are sequentially converted into digital signals for recording the photodiode switches through the numerical control analog switch array 6, the power supply voltage conversion circuit 7, the voltage amplification circuit 8 and the comparator circuit 9 under the regulation and control of the MCU10 and stored in the MCU10 register, the MCU10 is used for calculating and analyzing the signals to obtain a rotating speed increment signal, the calculated rotating speed increment signal is used as the rotating speed increment of the lower traction 12 and is transmitted to the driver 11 through an RS-232 communication protocol, and the driver 11 transmits the rotating speed to the lower traction 12 through profibus communication, so that the crosslinked polyethylene cable 4 is kept in the center of the alumina material pipeline 3 to move forwards.

Preferably, the laser emitter group 1 is composed of four pulse laser emitters 13, each two of which are in a group, respectively located in the horizontal direction and the vertical direction, and placed perpendicular to the tube wall, and the pulse point light source light signals emitted by the laser emitters are adjusted into parallel light beams after passing through the optical lens 2. The pulse point light source is transmitted, the frequency band of C band is selected for safety and power consumption, and the suspension system is built by adopting a photoelectric combination method, so that the anti-interference capability is higher;

preferably, the optical lens 2 is composed of four lenses, and the four lenses are respectively placed at the positions parallel to the alumina material pipeline 3 in the horizontal direction and the vertical direction to convert the point light source into parallel light beams.

Preferably, the linear photodiodes 5 are arranged and distributed in parallel at equal intervals by a plurality of photodiodes, the number of photodiodes determines the measurement accuracy and sensitivity of the system, and the higher the number of laser receivers, the higher the accuracy and sensitivity obtained.

Preferably, the alumina pipeline 3 is made of transparent alumina, the main crystal phase belongs to a cubic crystal system, the light transmittance can reach 95%, the high-temperature strength is high, and the bending strength reaches 280 MPa. Has good electrical insulation performance, the service temperature can reach more than 1700 ℃, and the high temperature resistant condition of the system is satisfied.

Preferably, the crosslinked polyethylene cable 4 is a novel high-voltage cable with a three-dimensional net structure, which takes polyethylene as a main material of an insulating layer, and adopts a three-layer co-extrusion catenary method (CCV) production method, namely three extruders are used for extruding the insulating material of the XLPE cable at the same time, and the XLPE cable is heated and wrapped into a wire by a sealing machine.

Preferably, the MCU10 performs calculation analysis on the signals stored in the register of the MCU10, specifically as follows: signals received by the horizontal linear array photodiode 5 and the vertical linear array photodiode 5 are divided into two groups by a central axis of a pipeline interface respectively, four groups of signals are obtained after sequentially passing through a power supply voltage conversion circuit, a voltage amplification circuit and a comparator circuit, and voltage signals converted from optical signals received by the photodiodes are recorded as:

{V₁₁、V₁₂…V_1n},{V₂₁、V₂₂…V_2n},{V₃₁、V₃₂…V_3n},{V₄₁、V₄₂…V_4n}；

and respectively summing the four groups of signals to obtain a signal summation signal which is recorded as:

and then the obtained summation signal is operated:

in an ideal state, the crosslinked polyethylene cable 5 is positioned in the center of the pipeline, and the calculated V is₁、V₂Zero, V, when the position of the crosslinked polyethylene cable 5 in the pipe is changed₁、V₂Taking absolute values of the two signals and adding the two signals to obtain a signal:

V_∑＝|V₁|+|V₂|

and then carrying out proportion adjustment on the obtained signals:

Signal_out＝K*V_∑(ii) a Wherein K is a proportionality coefficient and has a value range of 0-10V;

the obtained Signal Signal_outThe increment of the lower traction rotating speed is transmitted to the driver through an RS-232 protocol, and the driver controls the advancing speed of the crosslinked polyethylene 5 cable so as to keep the position of the crosslinked polyethylene 5 at the center of the pipeline.

Compared with the prior art, the invention has the following advantages:

1. the signal acquisition, operation and output functions are composed of the MCU and a peripheral circuit, the system structure is simple, and the operation speed is higher compared with the traditional unit operation speed;

2. the position of the cable in the pipeline is measured by using the optical signal, so that the speed is high and the anti-interference capability is strong;

3. the pipeline made of transparent high-temperature-resistant materials has high visibility;

4. the more the number of the diodes of the linear array photodiode is, the higher the accuracy and the sensitivity of the system are.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a system block diagram of an electro-optical pendant system for a cross-linked cable production line according to the present invention;

in the figure: the device comprises a laser emitter group 1, an optical lens 2, an alumina material pipeline 3, a cross-linked polyethylene cable 4, a linear array photodiode 5, a numerical control analog switch array 6, a power supply voltage conversion circuit 7, a voltage amplification circuit 8, a comparator circuit 9, an MCU10, a driver 11, a lower traction 12, a pulse laser emitter 13, a photodiode 14 and an analog switch 15;

FIG. 2 is a schematic diagram of a numerical control multi-way analog switch and communication MCU control unit of a photoelectric suspension system for a crosslinked cable production line according to the present invention;

in the figure: d1, D2 to D5: the MCU outputs a gating signal for controlling the analog switch; u1: CD4051, 8 channel digital control analog electronic switch; OUT: a gating signal output terminal; m1 inverter; m2: a NAND gate circuit;

FIG. 3 is a circuit diagram of the power supply voltage conversion, voltage amplifier and comparator circuit of an optical phased array driver circuit based on pulse height according to the present invention;

in the figure: u1, U2: LM7332 chips R1-R10: a resistance; C1-C16 are capacitors; RP1 potentiometer.

Detailed Description

The following embodiments are only used for illustrating the technical solutions of the present invention more clearly, and therefore, the following embodiments are only used as examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

Example 1

The invention realizes a photoelectric suspension system for a crosslinked cable production line, so that a cable moves forwards at the center of a pipeline;

as shown in fig. 1, a photoelectric suspension system for a cross-linked cable production line includes a laser emitter group 1, an optical lens 2, an alumina pipeline 3, a cross-linked polyethylene cable 4, a linear photodiode 5, a digital control analog switch array 6, a power supply voltage conversion circuit 7, a voltage amplification circuit 8, a comparator circuit 9, an MCU10, a driver 11 and a lower traction 12; the laser transmitter array 1 emits a pulse point light source, the light is adjusted into parallel light through the optical lens 2 and vertically passes through the alumina pipeline 3, when the position of the crosslinked polyethylene cable 4 in the alumina pipeline 3 changes, the light can be shielded, a part of the linear array photodiode 5 can not receive optical signals, the signals generated by the linear array photodiode 5 are divided into two groups in the horizontal and vertical directions to obtain four groups of current signals, the horizontal direction is one group and two groups, the vertical direction is recorded into three groups and four groups, the four groups of current signals are converted into digital signals for recording the photodiode switch through the numerical control analog switch array 6, the power supply voltage conversion circuit 7, the voltage amplification circuit 8 and the comparator circuit 9 under the regulation and control of the MCU10, the digital signals are stored in the MCU10 register, the signals are subjected to a series of operation by the MCU10 and are transmitted to the driver 11 as the rotating speed increment of the lower traction 12 through an RS-232 communication protocol, the driver 11 transmits the rotating speed to the lower traction 12 through profibus communication, so that the polyethylene cable 5 is kept in the center of the alumina pipeline 4 to move forwards.

The optical lens 2 is composed of four lenses and is respectively arranged at the position parallel to the alumina material pipeline 3 in the horizontal direction and the vertical direction to convert a point light source into parallel light beams.

The linear array photodiode 5 is formed by arranging and distributing a plurality of photodiodes in parallel, the number of the photodiodes determines the measurement accuracy and sensitivity of the system, and the higher the number of the laser receivers is, the higher the obtained accuracy and sensitivity are.

The alumina pipeline 3 is made of transparent alumina, the main crystal phase belongs to a cubic crystal system, the light transmittance can reach 95%, the high-temperature strength is high, and the bending strength reaches 280 MPa. Has good electrical insulation performance, the service temperature can reach more than 1700 ℃, and the high temperature resistant condition of the system is satisfied. The parallel light beams vertically enter the alumina material pipeline 3, the path of the light beams is unchanged, and the parallel light beams are vertically emitted from the alumina material pipeline 3 at the other side and received by the linear array photodiode 5.

The crosslinked polyethylene cable 4 is a novel high-voltage cable with a three-dimensional net structure and takes polyethylene as a main material of an insulating layer, a three-layer co-extrusion catenary method (CCV) production method is adopted, namely, three extruders are used for extruding the insulating material of the XLPE cable at the same time, and the insulating material is heated and wrapped into a line by a sealing machine.

The numerical control analog switch array 6 is composed of a plurality of CD4051 chips, the number of the chips depends on the number of the photodiodes in the linear array photodiodes 5, the chips can be changed according to actual conditions, the MCU10 outputs gating signals, and the analog switch 15 is controlled to output signals at a certain frequency.

The power supply voltage conversion circuit 7 and the voltage amplification circuit 8 are composed of an LM1117 chip, convert the obtained current signal into a voltage value, change the control parameters of the chip, and change the signal into the required voltage by necessary peripheral circuits.

The comparator circuit 9 is composed of an LM7332 chip, the U2B part is a voltage follower, the voltage value of the judgment binary signal is obtained, the output end is connected with the reverse input end of the U2A, the comparison is carried out on the voltage value and the signal output by the voltage amplifier 8, the signal representing the on and off of the photodiode is obtained, and the signal is transmitted to the MCU register for temporary storage.

The schematic diagram of the numerical control multi-channel analog switch connected with the MCU control unit is shown in figure 2. In fig. 2, a schematic diagram of 32 analog switches connected to the MCU control unit is shown, where D4 and D5 are chip selection signals and are responsible for selecting a chip, and D1, D2 and D3 are responsible for conducting signals in the chip by using a three-eight decoder method, so as to improve system accuracy and sensitivity, the number of current signals received from the linear array photodiode 3 in the present invention may be more than 32, and the requirement of multiple paths can be met by adding a chip selection signal.

As shown in fig. 3, the current signal is first converted into a voltage signal by the power voltage conversion circuit, then amplified by the voltage amplification circuit, and finally converted into a digital signal which can be identified by the MCU control unit by the next comparator circuit and stored in the MCU register for further operation.

The MCU10 calculates and analyzes the signals stored in the MCU10 register, and the method specifically comprises the following steps: signals received by the horizontal linear array photodiode 3 and the vertical linear array photodiode 3 are divided into two groups by a central axis of a pipeline interface, and the two groups of signals are obtained after sequentially passing through a power supply voltage conversion circuit, a voltage amplification circuit and a comparator circuit, and are recorded as:

{V₁₁、V₁₂…V_1n},{V₂₁、V₂₂…V_2n},{V₃₁、V₃₂…V_3n},{V₄₁、V₄₂…V_4n}; and respectively summing the four groups of signals to obtain a signal summation signal which is recorded as:

and then the obtained summation signal is operated:

in an ideal state, the crosslinked polyethylene cable 5 is positioned in the center of the pipeline, and the calculated V is₁、V₂Zero, V, when the position of the crosslinked polyethylene cable 5 in the pipe is changed₁、V₂Taking absolute values of the two signals and adding the two signals to obtain a signal:

V_∑＝|V₁|+|V₂|

and then carrying out proportion adjustment on the obtained signals:

Sianal_out＝K*V_∑

and transmitting the calculated signal serving as the increment of the lower traction rotating speed to a driver through an RS-232 protocol, and controlling the advancing speed of the crosslinked polyethylene 5 cable by the driver according to the lower traction rotating speed so as to keep the position of the crosslinked polyethylene 5 at the center of the pipeline.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (7)

1. A photoelectric suspension system for a cross-linked cable production line is characterized by comprising a laser emitter group (1), an optical lens (2), an alumina material pipeline (3), a cross-linked polyethylene cable (4), a linear array photodiode (5), a numerical control analog switch array (6), a power supply voltage conversion circuit (7), a voltage amplification circuit (8), a comparator circuit (9), an MCU (10), a driver (11) and a lower traction device (12); the laser emitter group (1) emits a pulse point light source, light rays are adjusted to be parallel light after passing through the optical lens (2) and vertically pass through the alumina material pipeline (3), when the position of a cross-linked polyethylene cable (4) in the alumina material pipeline (3) changes, the light rays can be shielded, one part of linear array photodiodes (5) can not receive optical signals, the central axis of the cross section of the alumina material pipeline (3) is taken as a boundary, signals generated by the linear array photodiodes (5) are divided into two groups in the horizontal and vertical directions to obtain four groups of current signals, the horizontal directions are one group and two groups, the vertical directions are recorded into three groups of four groups, the four groups of current signals sequentially pass through the numerical control analog switch array (6), the power supply voltage conversion circuit (7), the voltage amplification circuit (8) and the comparator circuit (9) under the regulation and control of the MCU (10), the signals are converted into digital signals for recording the photodiode switch and stored in a register of the MCU (10), the MCU (10) is used for calculating and analyzing the signals to obtain rotating speed increment signals, the rotating speed increment signals obtained through calculation are used as rotating speed increments of the lower traction (12) and transmitted to the driver (11) through an RS-232 communication protocol, the driver (11) transmits the rotating speed to the lower traction (12) through profibus communication, and therefore the fact that the crosslinked polyethylene cable (4) is kept in the center of the alumina material pipeline (3) in the forward direction is achieved.

2. The photovoltaic catenary system for crosslinked cable production lines according to claim 1, characterized in that said group of laser emitters (1) consists of four pulsed laser emitters (13), one in two, positioned horizontally and vertically, respectively, and placed perpendicular to the wall of the pipe, the pulsed point light source light signals emitted by the laser emitters being adjusted into parallel beams after passing through the optical lens (2).

3. The photovoltaic suspension system for crosslinked cable production lines according to claim 1, characterized in that said optical lens (2) consists of four lenses, placed respectively horizontally and vertically parallel to the alumina tubing (3), which convert the point light source into a parallel beam.

4. An optoelectronic pendant system for a crosslinked cable production line according to claim 1, wherein said linear array of photodiodes (5) is distributed by a plurality of photodiodes arranged in parallel at equal intervals.

5. The photovoltaic catenary system for a crosslinked cable production line according to claim 1, characterized in that the alumina tubing (3) is made of transparent alumina, the main crystal phase is cubic, the light transmittance is 95%, and the bending strength is 280 MPa.

6. The photovoltaic suspension system for crosslinked cable production line according to claim 1, wherein the crosslinked polyethylene cable (4) is a three-dimensional net-structured high-voltage cable with polyethylene as the main material of the insulation layer, and is produced by a three-layer co-extrusion catenary method, i.e. three extruders are used to simultaneously extrude the insulation material of the XLPE cable, and the XLPE cable is heated and wrapped into a wire by a sealer.

7. An optoelectronic pendant system for a crosslinked cable production line according to claim 1, wherein said MCU (10) performs a computational analysis of the signals stored in the MCU (10) registers, as follows: signals received by the horizontal linear array photodiode (5) and the vertical linear array photodiode (5) are divided into two groups by the central axis of a pipeline interface respectively, four groups of signals are obtained after sequentially passing through a power supply voltage conversion circuit, a voltage amplification circuit and a comparator circuit, and voltage signals converted from optical signals received by the photodiodes are recorded as:

{V₁₁、V₁₂…V_1n},{V₂₁、V₂₂…V_2n},{V₃₁、V₃₂…V_3n},{V₄₁、V₄₂…V_4n}；

and respectively summing the four groups of signals to obtain a signal summation signal which is recorded as:

and then the obtained summation signal is operated:

under ideal conditions, the crosslinked polyethylene cable (4) is positioned at the center of the pipeline, and the calculated V is₁、V₂Is zero, V is the position of the cross-linked polyethylene cable (4) in the pipeline changes₁、V₂Taking absolute values of the two signals and adding the two signals to obtain a signal:

V_∑＝|V₁|+|V₂|

and then carrying out proportion adjustment on the obtained signals:

Signal_out＝K*V_∑(ii) a Wherein K is a proportionality coefficient and has a value range of 0-10V;

the obtained Signal Signal_outThe increment of the lower traction rotating speed is transmitted to the driver through an RS-232 protocol, and the driver controls the advancing speed of the crosslinked polyethylene cable (4) so as to keep the position of the crosslinked polyethylene cable (4) at the center of the pipeline.

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