Integrated control module of PTFE pipe extrusion production line

Abstract

The utility model discloses an integrated control module for a PTFE (Polytetrafluoroethylene) pipe extrusion production line. A surge protection device; an energy storage inductor; a connection point between the energy storage inductor and the output filter capacitor forms an adjustable output voltage node; the feedback resistance network is connected to the adjustable output voltage node and comprises a first feedback resistor and a second feedback resistor; the numerical control potentiometer is used for generating adjustable reference voltage; the I2C bus interface is connected to the numerical control potentiometer; the three-area separated grounding system comprises a power ground, an analog ground and a digital ground. According to the utility model, the power supply and the numerical control reference are integrated in the same module, remote parameter adjustment is realized, the anti-interference capability is improved through the three-place partition design and the dual protection structure, the output ripple is reduced by adopting the optimized circuit layout, the on-line test and calibration capability is provided, and the test precision is improved. And the control precision and the maintenance convenience of the PTFE tube extrusion production line are obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a PTFE pipe extrusion production line integrated control module. BACKGROUND

[0002] In the existing PTFE pipe extrusion production line, the control system usually adopts a separate power module and a mechanical potentiometer to adjust parameters, and the above-mentioned mode not only has a complex structure and complicated wiring, but also the potentiometer is prone to drift due to aging and environmental influence, resulting in unstable control parameters. SUMMARY

[0003] The utility model discloses a PTFE pipe extrusion production line integrated control module.

[0004] The above technical purpose of the utility model is realized by the following technical scheme:

[0005] A PTFE pipe extrusion production line integrated control module, comprising: a step-down controller (U5); an input filter unit connected to the input end of the step-down controller (U5), the input filter unit comprising a first capacitor (C11) and a second capacitor (C12) connected in parallel; a surge protection device (D4) connected to the input end of the step-down controller (U5); an energy storage inductor (L1) connected to the switch end (SW) of the step-down controller (U5); an output filter capacitor (C13, C14) connected to the output end of the energy storage inductor (L1), and the connection point between the energy storage inductor (L1) and the output filter capacitor (C13, C14) forming an adjustable output voltage node (VADJ_1); a feedback resistor network connected to the adjustable output voltage node (VADJ_1), the feedback resistor network comprising a first feedback resistor (R11) and a second feedback resistor (R12); a digital potentiometer (U3) for generating an adjustable reference voltage; an IC bus interface connected to the digital potentiometer (U3), the IC bus interface comprising a data line (SDA) and a clock line (SCL); a three-zone separated grounding system comprising a power ground (PGND), an analog ground (AGND), and a digital ground (DGND). 2 2 The IC bus interface comprises a data line (SDA) and a clock line (SCL); the three-zone separated grounding system comprises a power ground (PGND), an analog ground (AGND), and a digital ground (DGND).

[0006] The utility model is further provided as follows: further comprising a bootstrap capacitor (C10) connected to the step-down controller (U5), and the bootstrap capacitor (C10) is connected between the switch end (SW) and the bootstrap end (BOOT) of the step-down controller (U5). ​

[0007] The utility model further sets up: the output end (W) of numerical control potentiometer (U3) is equipped with test point (TP5), adjustable output voltage node (VADJ_1) is equipped with test point (TP4).

[0008] The utility model further sets up: still include the control network that connects in the enable end (EN) of voltage reduction controller (U5), and the control network includes first resistance (R13), second resistance (R1) and the reserved external control interface resistance (R22).

[0009] The utility model further sets up: still include static protection device (D7, D8), and static protection device (D7, D8) are connected respectively in the digital interface side and analog interface side of numerical control potentiometer (U3).

[0010] The utility model further sets up: I 2 The pull-up resistance (R14, R15) is connected to power supply voltage.

[0011] The utility model further sets up: the inductance value of energy storage inductance (L1) is 33 μH, and the capacity value of output filter capacitor (C13, C14) is 10 μF respectively.

[0012] The utility model further sets up: the resistance of first feedback resistance (R11) is 147kΩ, and the resistance of second feedback resistance (R12) is 5.1kΩ, make adjustable output voltage node (VADJ_1) voltage value close to 24V.

[0013] The utility model further sets up: the reserved external control interface resistance (R22) is connected to external control signal (IO_EN1), is used for realizing remote start-stop control to voltage reduction controller (U5).

[0014] The utility model further sets up: power ground (PGND) connects the power loop of voltage reduction controller (U5), and analog ground (AGND) connects feedback resistance network, and digital ground (DGND) connects I 2 C bus interface, and power ground (PGND), analog ground (AGND) and digital ground (DGND) realize equipotential through single point connection.

[0015] Summarized above, the utility model has following beneficial effects:

[0016] Power supply and numerical control reference integration: the utility model integrates the voltage reduction controller (U5) and the numerical control potentiometer (U3) in the same module, and forms a compact and highly integrated control unit. The above design not only reduces the system complexity and the number of components, reduces the wiring and connection points, but also realizes the software programmable setting of the laser diameter measuring amplifier threshold, tension control gain, micro-heating current limiting point and other parameters, instead of the traditional mechanical potentiometer. By improving the hardware integration of the control module, the assembly and wiring workload is reduced, and the problem of unstable parameters caused by mechanical potentiometer aging drift is avoided.

[0017] Three-land partition and double protection structure: the utility model adopts the three-land separation grounding system of power ground (PGND), analog ground (AGND) and digital ground (DGND), and combines surge protection device (D4) and electrostatic protection device (D7, D8) to form a complete electromagnetic compatibility optimization structure. The power ground (PGND) is connected with the power loop of the voltage reduction controller (U5), the analog ground (AGND) is connected with the feedback resistance network, and the digital ground (DGND) is connected with the I 2 C bus interface, the above design effectively isolates the ground current of different types, prevents noise coupling. Surge protection device (D4) can absorb transient energy, and electrostatic protection device (D7, D8) provides instant ESD protection for digital and analog interfaces, significantly improves the anti-interference ability of the system in the PTFE pipe extrusion production environment, and reduces the fluctuation of diameter and wall thickness reading from ±0.5% to ±0.1%.

[0018] Low-ripple optimization design: by selecting 33uH energy storage inductor (L1) and two 10uF output filter capacitors (C13, C14), cooperating with the high-efficiency drive of bootstrap capacitor (C10), the utility model realizes low-ripple stabilized output. The output ripple is only about 10mV, which is much lower than the ripple of traditional switching power supply, and provides a stable and reliable power supply for the precise control in the PTFE pipe extrusion process. The accurate feedback resistance network (R11=147kΩ, R12=5.1kΩ) ensures the high-precision control of the adjustable output voltage node (VADJ_1) about 23.9V, significantly improves the accuracy of extrusion control, improves the wall thickness fluctuation from ±3% to ±1%, and reduces the scrap rate.

[0019] Remote parameter adjustment and start-stop control: by using the I 2 C bus interface (SDA, SCL) and pull-up resistor (R14, R15) to form a communication network, combined with the numerical control potentiometer (U3), the remote software adjustment of the key parameters is realized. The traditional mechanical potentiometer needs manual adjustment, and each adjustment takes about 30 seconds to 1 minute, and the accuracy depends on the experience of the operator; while using the I 2The C digital controlled potentiometer has shortened adjustment time, improved precision and significantly improved adjustment repeatability, and simultaneously, through the reserved external control interface resistor (R22) and the network connected to the external control signal (IO_EN1), remote start-stop control of the step-down controller (U5) is realized, which facilitates the realization of energy saving strategy, cuts off unnecessary load in standby state and reduces standby energy consumption.

[0020] Convenient test and maintenance structure: test points (TP5, TP4) are arranged at the output end (W) of the digital controlled potentiometer (U3) and the adjustable output voltage node (VADJ_1), so that a maintenance structure convenient for online calibration and fault diagnosis is constructed. The test points serve as station quality inspection contacts, facilitate online monitoring and rapid positioning of problems by using an oscilloscope or a multimeter, shorten fault diagnosis time and improve equipment availability. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a circuit structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0022] In the description of the utility model, it needs to be explained that the orientation words such as "up", "down", "front", "back", "left", "right" and the like are only for the convenience of description and understanding of the utility model, and are not indicative or suggestive of the devices or elements indicated having a specific orientation, being constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0023] As shown in Figure 1 The utility model provides a kind of PTFE pipe extrusion production line integrated control module, including step-down controller (U5), the step-down controller (U5) adopts EUP3458VIR1 or similar model Buck controller, integrates high side MOSFET switch.The input end of step-down controller (U5) is connected with input filter unit, and the input filter unit includes the first capacitor (C11) and the second capacitor (C12) arranged in parallel.The first capacitor (C11) adopts 0.1 μF ceramic capacitor, and the second capacitor (C12) adopts 10 μF electrolytic capacitor, and the above parallel configuration provides the filter performance of wide frequency band, and has better inhibitory effect on high frequency and low frequency interference.

[0024] Surge protection device (D4) is further connected to the input end of step-down controller (U5), and the surge protection device (D4) is TVS diode, can carry out fast clamping protection to power input when motor start-stop, relay back-priming or static interference occurs, absorbs transient energy, improves the anti-interference ability of system.

[0025] The switch end (SW) of the voltage reduction controller (U5) is connected with an energy storage inductor (L1), which is 33muH and serves as a main energy storage element of the Buck circuit.

[0026] The adjustable output voltage node (VADJ_1) is connected with a feedback resistance network, including a first feedback resistance (R11) and a second feedback resistance (R12). The resistance value of the first feedback resistance (R11) is 147kOmega, and the resistance value of the second feedback resistance (R12) is 5.1kOmega. Through the above voltage division ratio, the voltage value of the adjustable output voltage node (VADJ_1) is close to 24V. Specifically, according to the internal reference voltage (about 0.8V) of the voltage reduction controller (U5) and the feedback voltage division principle, the output voltage (VADJ_1) is approximately 0.8*(1+147k / 5.1k)≈23.9V, which provides a stable power supply for the measurement and control unit of the PTFE pipe extrusion line.

[0027] The self-boosting capacitor (C10) is also connected between the switch end (SW) and the self-boosting end (BOOT) of the voltage reduction controller (U5), which is 10nF and is used to provide voltage for the internal high-side MOSFET drive to improve switching efficiency. The self-boosting capacitor (C10) is closely connected with the two pins of the voltage reduction controller (U5) to form a small area high frequency loop, which reduces the parasitic inductance and improves the switching speed.

[0028] The utility model discloses a three-zone separated grounding system, including power ground (PGND), analog ground (AGND) and digital ground (DGND). The power ground (PGND) connects the power loop of the voltage reduction controller (U5), including the return path of the input filter capacitor and the output filter capacitor;The analog ground (AGND) is connected with the feedback resistance network, especially the lower end of the second feedback resistance (R12);The digital ground (DGND) is connected with the I 2 C bus interface and digital logic circuit. The above three zones are connected to the same potential at the power inlet or through a single point connection mode, effectively isolating the ground current of different types, preventing noise coupling, and significantly improving the anti-interference ability of the system in harsh industrial environments.

[0029] The utility model also includes a numerical control potentiometer (U3), which adopts MCP4017T-502E / LT or similar model and is controlled through the I 2 C bus interface. 2The C bus interface includes a data line (SDA) and a clock line (SCL), and pull-up resistors (R14, R15) are arranged on the two lines, each resistor has a resistance value of 10kΩ and is connected to a 5V power voltage.

[0030] The static protection devices (D7) and (D8) are respectively connected to the digital interface side and the analog interface side of the digital potentiometer (U3), the static protection devices are LESD5Z5.0C or similar models, and when static discharge occurs, the static protection devices are quickly clamped to the ground, so that the sensitive digital and analog circuits are protected from ESD damage.

[0031] The utility model further has a control network connected to the enable end (EN) of the voltage reduction controller (U5), and the control network includes a first resistor (R13), a second resistor (R1) and a reserved external control interface resistor (R22). The first resistor (R1) and the second resistor (R1) are both 300kΩ, and form a voltage division network of the enable end, which determines the starting threshold of the voltage reduction controller (U5). The reserved external control interface resistor (R22) is also 300kΩ, and is connected to an external control signal (IO_EN1), so that an external microcontroller or PLC can remotely control the start and stop of the voltage reduction controller (U5) to realize an energy-saving control strategy and cut off unnecessary loads when the device is on standby.

[0032] The working process of the utility model is as follows: when a 24V DC power supply is input, the power supply is first filtered through an input filter unit (C11, C12), and a surge protection device (D4) provides transient protection in this process. After the enable end (EN) voltage reaches the threshold, the voltage reduction controller (U5) starts and begins PWM control at a fixed frequency. The internal MOSFET switch provides energy to the energy storage inductor (L1) through the switch end (SW), the (L1) converts the energy into current and stores it, and when the switch is closed, the energy storage inductor (L1) releases energy to the output filter capacitor (C13, C14) to form a stable output voltage (VADJ_1).

[0033] The feedback resistor network (R11, R12) divides the output voltage (VADJ_1) and feeds it back to the (FB) pin of the voltage reduction controller (U5), and the internal comparator of the (U5) compares the voltage with the internal reference voltage to adjust the PWM duty cycle, so that the output voltage is maintained near the set value. At the same time, the digital potentiometer (U3) adjusts the output voltage through the I 2The C bus interface receives commands from an external controller, adjusts its internal resistance value, and thus generates an adjustable reference voltage at the output (W), which can be used for threshold setting, gain control, etc.

[0034] The three-zone separated ground structure of the system plays the following roles in the entire working process: the power ground (PGND) undertakes the large current loop, the analog ground (AGND) ensures the accuracy of the feedback signal, and the digital ground (DGND) is used for I 2 The C communication provides a stable reference position. The above-mentioned partition design effectively isolates currents and signals of different natures, improving the anti-interference ability of the system in the PTFE pipe extrusion production environment.

[0035] The design of the utility model fully considers the actual needs of the PTFE pipe extrusion production line, integrates power regulation and numerical control reference in the same module, realizes the same board integration of power + numerical control reference, improves the system reliability, and reduces the number of components and cost. Through the three-ground partition and double protection structure, the anti-interference ability of the system is significantly improved, and the stability of measurement and control is ensured. Through the I 2 The C bus controlled numerical control potentiometer realizes remote accurate adjustment of key parameters, and eliminates the aging drift problem of mechanical potentiometers. The whole system structure is compact, perfect in function, and strong in anti-interference ability, and is an upgrading scheme of high-performance and high-reliability control module in the PTFE pipe extrusion production line.

[0036] The utility model adopts the following experimental test PTFE pipe extrusion production line integrated control module technical effect.

[0037] 1. Test adopts comparative experiment method, compares the performance of the integrated control module of the utility model and the traditional separated control module in the same PTFE pipe extrusion production line environment.

[0038] The test environment is an industrial site, including frequent start-stop of motor and high-temperature stretching working condition. The test equipment includes a high-precision oscilloscope (bandwidth ≥ 100MHz), a voltmeter (accuracy ± 0.1%), a spectrum analyzer, an electrostatic discharge generator (± 8kV) and a data acquisition system. Each test is repeated 10 times, and the average value is taken to ensure data reliability. The test process is divided into three stages: steady-state test, dynamic response test and interference resistance test, a total of 48 hours, covering the production cycle.

[0039] 2. Technical effect comparison table

[0040]

[0041] 3. Verification conclusion

[0042] The experimental results show that the integrated control module is significantly superior to the traditional separated module in various core technical indexes. Firstly, the output voltage ripple test shows that the traditional module has high ripple during the motor start-stop process, while the ripple of the utility model module is only about 10mV (0.04%), which is reduced by 73%~90%, and the above low ripple characteristics improve the accuracy of diameter measurement and wall thickness measurement.

[0043] In the anti-interference ability test, when ±8kV electrostatic discharge and motor start-stop transient interference are applied to the system, the diameter reading fluctuation of the traditional system reaches ±0.5%, while the utility model module controls the fluctuation within ±0.1%, which is improved by 80%. This mainly depends on the effective isolation of the three-land partition design and the double protection structure. The PTFE pipe wall thickness control accuracy is improved from ±3% of the traditional system to ±1%, which is improved by 67%, and the corresponding scrap rate is reduced from 7.5% to 2.8%.

[0044] The parameter adjustment performance test shows that the traditional mechanical potentiometer needs 30~60 seconds to adjust once and the adjustment accuracy depends on the operator's experience, while the I 2 C digital potentiometer of the utility model has an adjustment time of less than 100 milliseconds and an accuracy of 256 levels, which shortens the operation time by 99%. The system integration test shows that the utility model integrates the original dispersed power supply and reference voltage module into a unit, which reduces the PCB area and connection points, thereby improving the system reliability.

[0045] In summary, the utility model has made significant technical progress in power supply stability, anti-interference ability, parameter adjustment convenience and system integration, which has substantially improved the control accuracy and operation efficiency of the PTFE pipe extrusion production line, and has broad application prospect.

Claims

1. A PTFE tube extrusion line integrated control module, characterized by, The application relates to a voltage reduction controller (U5); an input filter unit connected to the input end of the voltage reduction controller (U5), wherein the input filter unit comprises a first capacitor (C11) and a second capacitor (C12) connected in parallel; a surge protection device (D4) connected to the input end of the voltage reduction controller (U5); an energy storage inductor (L1) connected to the switch end (SW) of the voltage reduction controller (U5); an output filter capacitor (C13, C14) connected to the output end of the energy storage inductor (L1), wherein the connection point between the energy storage inductor (L1) and the output filter capacitor (C13, C14) forms an adjustable output voltage node (VADJ_1); a feedback resistance network connected to the adjustable output voltage node (VADJ_1), wherein the feedback resistance network comprises a first feedback resistance (R11) and a second feedback resistance (R12); a digital control potentiometer (U3) for generating an adjustable reference voltage; a three-zone separated grounding system comprising a power ground (PGND), an analog ground (AGND) and a digital ground (DGND). The application further comprises a bootstrap capacitor (C10) connected to the voltage reduction controller (U5), wherein the bootstrap capacitor (C10) is connected between the switch end (SW) and the bootstrap end (BOOT) of the voltage reduction controller (U5). The output end (W) of the digital control potentiometer (U3) is provided with a test point (TP5), and the adjustable output voltage node (VADJ_1) is provided with a test point (TP4). The application further comprises a control network connected to the enable end (EN) of the voltage reduction controller (U5), wherein the control network comprises a first resistance (R13), a second resistance (R1) and a reserved external control interface resistance (R22). The application further comprises electrostatic protection devices (D7, D8), wherein the electrostatic protection devices (D7, D8) are respectively connected to the digital interface side and the analog interface side of the digital control potentiometer (U3). The inductance value of the energy storage inductor (L1) is 33 mu H, and the capacitance value of the output filter capacitor (C13, C14) is 10 mu F. The resistance value of the first feedback resistance (R11) is 147 k Omega, and the resistance value of the second feedback resistance (R12) is 5.1 k Omega, so that the voltage value of the adjustable output voltage node (VADJ_1) is close to 24 V. The reserved external control interface resistance (R22) is connected to an external control signal (IO_EN1) for realizing remote start-stop control of the voltage reduction controller (U5). I 2 C bus interface, said I 2 C bus interface comprises a data line (SDA) and a clock line (SCL); ​ 2. The PTFE tube extrusion line integrated control module of claim 1, wherein, ​ 3. The PTFE tube extrusion line integrated control module of claim 1, wherein, ​ 4. The PTFE tube extrusion line integrated control module of claim 1, wherein, ​ 5. The PTFE tube extrusion line integrated control module of claim 1, wherein, ​ 6. The PTFE tube extrusion line integrated control module of claim 1, wherein, The I 2 A pull-up resistor (R14, R15) is provided on the C bus interface, which is connected to the supply voltage.

7. The PTFE tube extrusion line integrated control module of claim 1, wherein, ​ 8. The PTFE tube extrusion line integrated control module of claim 1, wherein, ​ 9. The PTFE tube extrusion line integrated control module of claim 4, wherein, ​ 10. The PTFE tube extrusion line integrated control module of claim 1, wherein, The power ground (PGND) connects the power loop of the voltage reduction controller (U5), the analog ground (AGND) connects the feedback resistance network, the digital ground (DGND) connects the I 2 The C bus interface, the power ground (PGND), the analog ground (AGND) and the digital ground (DGND) are connected by a single point to achieve equipotential.

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