Speed control device of transmission mechanism and intelligent control system of coal-fired power plant

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The closed-loop control system solves the deviation problem of the speed control system of the transmission mechanism when the load changes or external interference occurs, realizes precise control of motor speed, and improves transmission stability and equipment life.

CN224304056UActive Publication Date: 2026-05-29XINJIANG WESTERN TIANFU HESHENG THERMAL POWER CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: XINJIANG WESTERN TIANFU HESHENG THERMAL POWER CO LTD
Filing Date: 2025-08-25
Publication Date: 2026-05-29

AI Technical Summary

Technical Problem

Existing open-loop control transmission mechanism speed control systems are prone to speed deviations from expected values and cannot automatically correct themselves when the load changes or when subjected to external disturbances.

Method used

A closed-loop control system is adopted, including a control unit, a boost module, a speed sensor, a low-pass filter, and a voltage regulator unit, forming a closed-loop feedback mechanism. The motor speed signal is fed back in real time by the speed sensor, and after low-pass filtering and voltage regulation, it is input to the control unit to achieve precise control of the motor speed.

Benefits of technology

This achieves stable locking of the motor speed at a preset value, improving transmission stability and positioning accuracy, extending equipment life, and reducing maintenance requirements.

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Figure CN224304056U_ABST

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Abstract

The utility model discloses a kind of speed control device and coal-fired power plant intelligent control system of transmission mechanism for solving the problem that speed is easy to deviate from expected value and cannot be automatically corrected when load changes or is disturbed by outside in prior art open-loop control transmission mechanism speed control system, the device includes control unit CM, boost module, speed sensor VOL, low pass filter LPF, voltage stabilizing unit.Control unit CM is used to generate speed control signal;Boost module promotes the voltage of speed control signal to the voltage that can drive motor, and keeps motor speed at preset value;Wherein motor is motor transmission connection with the driving wheel of transmission mechanism;Speed sensor VOL converts motor speed signal into voltage signal;Low pass filter LPF filters high-frequency noise;Voltage stabilizing unit is connected with low pass filter LPF and control unit CM, and is used to stabilize the voltage entering control unit CM.

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Description

Technical Field

[0001] This utility model relates to the field of control system technology, and in particular to a speed control device for a transmission mechanism and an intelligent control system for a coal-fired power plant. Background Technology

[0002] In industrial production lines, the speed control accuracy of the transmission mechanism has a direct impact on the assembly accuracy and production efficiency of the products.

[0003] Existing open-loop speed control systems for transmission mechanisms are relatively simple in structure, typically consisting of a control unit, a drive circuit, and a motor. The control unit directly outputs a preset control signal, which is amplified by the drive circuit to drive the motor. The motor then drives the drive wheel of the transmission mechanism, causing the conveyor belt to move. The entire system lacks a speed feedback loop, relying solely on preset parameters from the control unit to control the speed. However, open-loop speed control systems for transmission mechanisms are prone to speed deviations from expected values when the load changes or when subjected to external disturbances, and these deviations cannot be automatically corrected. Utility Model Content

[0004] This invention addresses the problem that in existing open-loop control systems for transmission mechanisms, the speed easily deviates from the expected value and cannot be automatically corrected when the load changes or external disturbances occur. It provides a speed control device for a transmission mechanism and an intelligent control system for a coal-fired power plant.

[0005] The technical solution adopted in this utility model is:

[0006] A speed control device for a transmission mechanism includes a control unit CM, a boost module, a speed sensor VOL, a low-pass filter LPF, and a voltage regulator unit.

[0007] The control unit CM is used to generate speed control signals, and the voltage of the speed control signals does not exceed 5V;

[0008] The boost module is connected to the control unit CM. The boost module boosts the voltage of the speed control signal to a voltage that can drive the motor and maintain the motor speed at a preset value. The motor is a motor that is connected to the drive wheel of the transmission mechanism.

[0009] The speed sensor VOL is connected to the motor and converts the motor speed signal into a voltage signal.

[0010] The low-pass filter LPF is connected to the speed sensor VOL to filter out high-frequency noise;

[0011] The voltage regulator unit is connected to the low-pass filter LPF and the control unit CM to stabilize the voltage entering the control unit CM.

[0012] The control unit CM, boost module, speed sensor VOL, low-pass filter LPF, and voltage regulator unit constitute a closed-loop control system.

[0013] Furthermore, the control unit CM includes:

[0014] Operational amplifier AMP1 has its inverting input connected to low-pass filter LPF via resistor R4. The output of operational amplifier AMP1 is connected to its inverting input via resistor R5, which has the same resistance as resistor R4. The non-inverting input of operational amplifier AMP1 is grounded via resistor R6.

[0015] The sliding rheostat R7 has two fixed terminals connected to the 5V power supply VCC and ground respectively, and the sliding terminal of the sliding rheostat R7 is connected to the output terminal of the operational amplifier AMP1.

[0016] Operational amplifier AMP2 has its inverting input connected to the output of operational amplifier AMP1 via resistor R1. Capacitor C1 is connected in parallel with resistor R1. The output of operational amplifier AMP2 is connected to its inverting input via capacitor C2 and resistor R2. The non-inverting input of operational amplifier AMP2 is grounded via resistor R3. Operational amplifier AMP2, resistors R1, R2, and R3, and capacitors C1 and C2 constitute a PID control circuit.

[0017] Furthermore, resistor R1 is a variable resistor used to adjust the amplification factor and integral factor of the PID control circuit.

[0018] Furthermore, resistor R2 is a variable resistor used to adjust the amplification factor and derivative factor of the PID control circuit.

[0019] Furthermore, the voltage regulation unit is a transient voltage suppressor (TVS), which is connected to resistor R4 and ground. The TVS has advantages such as high transient power, low leakage current, small breakdown voltage deviation, easily controllable clamping voltage, no damage limit, and small size.

[0020] Furthermore, the output of operational amplifier AMP2 is connected to the boost module via operational amplifier AMP3, wherein the non-inverting input of operational amplifier AMP3 is connected to the output of operational amplifier AMP2, and the output of operational amplifier AMP3 is connected to the inverting input of operational amplifier AMP3 and the boost module.

[0021] Furthermore, the boost module is a BOOST boost circuit. BOOST boost circuits offer advantages such as high-efficiency voltage boosting, wide input range, simple structure, low cost, and high stability.

[0022] Based on the same inventive concept, this utility model also provides an intelligent control system for a coal-fired power plant, which includes the aforementioned speed control device for the transmission mechanism.

[0023] The beneficial effects of this utility model are:

[0024] The speed control device of the transmission mechanism disclosed in this utility model outputs a signal of less than 5V through the control unit CM, which is boosted to directly drive the motor, simplifying the structure; the speed sensor VOL provides real-time feedback, which is accurately input to the control unit CM after low-pass filtering and voltage stabilization, forming a closed loop, so that the motor speed is always locked at the preset value, suppressing load fluctuations, improving transmission stability and positioning accuracy, extending equipment life and reducing maintenance. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a circuit diagram of the speed control device for the transmission mechanism. Detailed Implementation

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0029] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0030] As attached Figure 1As shown, the speed control device for the transmission mechanism disclosed in this embodiment includes a control unit CM, a boost module, a speed sensor VOL, a low-pass filter LPF, and a voltage regulator unit.

[0031] The control unit CM is used to generate speed control signals, and the voltage of the speed control signals does not exceed 5V;

[0032] The boost module is connected to the control unit CM. The boost module boosts the voltage of the speed control signal to a voltage that can drive the motor and maintain the motor speed at a preset value. The motor is a motor that is connected to the drive wheel of the transmission mechanism.

[0033] The speed sensor VOL is connected to the motor and converts the motor speed signal into a voltage signal.

[0034] The low-pass filter LPF is connected to the speed sensor VOL to filter out high-frequency noise;

[0035] The voltage regulator unit is connected to the low-pass filter LPF and the control unit CM to stabilize the voltage entering the control unit CM.

[0036] The control unit CM, boost module, speed sensor VOL, low-pass filter LPF, and voltage regulator unit constitute a closed-loop control system.

[0037] The working principle of the speed control device of the transmission mechanism is as follows: The control unit CM generates a speed control signal with a voltage not exceeding 5V. This signal is transmitted to the boost module, which boosts it to a voltage capable of driving the motor, thereby driving the motor connected to the drive wheel of the transmission mechanism. At the same time, the speed sensor VOL is connected to the motor, which detects the motor speed in real time and converts it into a voltage signal. This voltage signal is first filtered by a low-pass filter LPF to remove high-frequency noise, and then the voltage is stabilized by a voltage regulator before being transmitted to the control unit CM. The control unit CM continuously adjusts the output speed control signal according to the deviation between the feedback speed signal and the preset value, ultimately achieving stable control of the motor speed and ensuring that it remains at the preset value.

[0038] The beneficial effects of the above technical solution are as follows: the speed control device of the transmission mechanism outputs a signal within 5V through the control unit CM, which is boosted to directly drive the motor, simplifying the structure; the speed sensor VOL provides real-time feedback, which is accurately input to the control unit CM after low-pass filtering and voltage stabilization, forming a closed loop, so that the motor speed is always locked at the preset value, suppressing load fluctuations, improving transmission stability and positioning accuracy, extending equipment life and reducing maintenance.

[0039] Furthermore, the control unit CM includes:

[0040] Operational amplifier AMP1 has its inverting input connected to low-pass filter LPF via resistor R4. The output of operational amplifier AMP1 is connected to its inverting input via resistor R5, which has the same resistance as resistor R4. The non-inverting input of operational amplifier AMP1 is grounded via resistor R6.

[0041] The sliding rheostat R7 has two fixed terminals connected to the 5V power supply VCC and ground respectively, and the sliding terminal of the sliding rheostat R7 is connected to the output terminal of the operational amplifier AMP1.

[0042] Operational amplifier AMP2 has its inverting input connected to the output of operational amplifier AMP1 via resistor R1. Capacitor C1 is connected in parallel with resistor R1. The output of operational amplifier AMP2 is connected to its inverting input via capacitor C2 and resistor R2. The non-inverting input of operational amplifier AMP2 is grounded via resistor R3. Operational amplifier AMP2, resistors R1, R2, and R3, and capacitors C1 and C2 constitute a PID control circuit.

[0043] The working principle of the control unit CM is as follows:

[0044] Operational amplifier AMP1, resistors R4, R5, and R6 form an inverting amplifier circuit. Since the resistance of resistor R5 is equal to that of resistor R4, the amplification factor of this inverting amplifier circuit is 1. Therefore, the value of the output voltage of operational amplifier AMP1 is the negative of the value of the output voltage of low-pass filter LPF.

[0045] The sliding rheostat R7 is used to provide the voltage corresponding to the preset value of the motor speed. The sliding end of the sliding rheostat R7 is connected to the output end of the operational amplifier AMP1. This is equivalent to the voltage corresponding to the preset value of the motor speed minus the voltage fed back from the actual value of the motor speed. The difference between the voltage corresponding to the preset value of the motor speed and the voltage fed back from the actual value of the motor speed reflects the deviation between the preset value of the motor speed and the actual value of the motor speed.

[0046] Operational amplifier AMP2, resistors R1, R2, and R3, and capacitors C1 and C2 constitute a PID control circuit. The output of operational amplifier AMP1 is the input of this PID control circuit, where the voltage is ui. ui is the voltage corresponding to the preset motor speed minus the voltage fed back from the actual motor speed. The output of operational amplifier AMP2 is the output of this PID control circuit, where the voltage is uo. The formula for calculating uo is: ;

[0047] The beneficial effects of this control unit CM are as follows: the control unit CM implements the PID control algorithm through a discrete circuit composed of multiple electronic components. The PID control algorithm has the characteristics of fast response to deviation, strong dynamic adjustment capability and strong anti-interference capability. Compared with integrated circuits, discrete circuits have the advantages of high and low temperature resistance, strong anti-interference capability and low cost (for scenarios that only require basic PID function, discrete circuits can omit unnecessary functions in integrated chips).

[0048] Furthermore, resistor R1 is a variable resistor used to adjust the amplification factor and integral factor of the PID control circuit.

[0049] Furthermore, resistor R2 is a variable resistor used to adjust the amplification factor and derivative factor of the PID control circuit.

[0050] Furthermore, the voltage regulation unit is a transient voltage suppressor (TVS), which is connected to resistor R4 and ground. The TVS has advantages such as high transient power, low leakage current, small breakdown voltage deviation, easily controllable clamping voltage, no damage limit, and small size.

[0051] Furthermore, the output of operational amplifier AMP2 is connected to the boost module via operational amplifier AMP3, wherein the non-inverting input of operational amplifier AMP3 is connected to the output of operational amplifier AMP2, and the output of operational amplifier AMP3 is connected to the inverting input of operational amplifier AMP3 and the boost module.

[0052] The beneficial effects of the above technical solution are as follows: the output terminal of the operational amplifier AMP3 is connected to the inverting input terminal of the operational amplifier AMP3 to form a voltage follower. The voltage follower isolates the impedance of the front and rear stage circuits from each other through high input impedance and low output impedance, avoids signal distortion caused by insufficient load capacity of the front stage, and reduces the impact of the rear stage interference on the front stage.

[0053] Furthermore, the boost module is a BOOST boost circuit. BOOST boost circuits offer advantages such as high-efficiency voltage boosting, wide input range, simple structure, low cost, and high stability.

[0054] Based on the same inventive concept, this embodiment also provides an intelligent control system for a coal-fired power plant, which includes the aforementioned speed control device for the transmission mechanism.

Claims

1. A speed control device for a transmission mechanism, characterized in that, include: The control unit CM is used to generate speed control signals, the voltage of which does not exceed 5V; The boost module is connected to the control unit CM. The boost module boosts the voltage of the speed control signal to a voltage that can drive the motor and maintain the motor speed at a preset value. The motor is a motor that is connected to the drive wheel of the transmission mechanism. The speed sensor VOL is connected to the motor and converts the motor speed signal into a voltage signal. The low-pass filter LPF is connected to the speed sensor VOL and is used to filter out high-frequency noise. The voltage regulator unit is connected to the low-pass filter LPF and the control unit CM to stabilize the voltage entering the control unit CM; The control unit CM, boost module, speed sensor VOL, low-pass filter LPF, and voltage regulator unit constitute a closed-loop control system.

2. The speed control device for the transmission mechanism according to claim 1, characterized in that, The control unit CM includes: Operational amplifier AMP1 has its inverting input connected to low-pass filter LPF via resistor R4. The output of operational amplifier AMP1 is connected to its inverting input via resistor R5, which has the same resistance as resistor R4. The non-inverting input of operational amplifier AMP1 is grounded via resistor R6. The sliding rheostat R7 has two fixed terminals connected to the 5V power supply VCC and ground respectively, and the sliding terminal of the sliding rheostat R7 is connected to the output terminal of the operational amplifier AMP1. Operational amplifier AMP2 has its inverting input connected to the output of operational amplifier AMP1 via resistor R1. Capacitor C1 is connected in parallel with resistor R1. The output of operational amplifier AMP2 is connected to its inverting input via capacitor C2 and resistor R2. The non-inverting input of operational amplifier AMP2 is grounded via resistor R3. Operational amplifier AMP2, resistors R1, R2, and R3, and capacitors C1 and C2 constitute a PID control circuit.

3. The speed control device for the transmission mechanism according to claim 2, characterized in that, Resistor R1 is a variable resistor used to adjust the amplification factor and integral factor of the PID control circuit.

4. The speed control device for the transmission mechanism according to claim 2, characterized in that, Resistor R2 is a variable resistor used to adjust the amplification factor and derivative factor of the PID control circuit.

5. The speed control device for the transmission mechanism according to claim 2, characterized in that, The voltage regulator unit is a transient voltage suppressor (TVS), which is connected to resistor R4 and ground.

6. The speed control device for the transmission mechanism according to claim 2, characterized in that, The output of operational amplifier AMP2 is connected to the boost module, and operational amplifier AMP3 is connected to it. The non-inverting input of operational amplifier AMP3 is connected to the output of operational amplifier AMP2, and the output of operational amplifier AMP3 is connected to the inverting input of operational amplifier AMP3 and the boost module.

7. The speed control device for the transmission mechanism according to any one of claims 2-6, characterized in that, The boost module is a BOOST boost circuit.

8. An intelligent control system for a coal-fired power plant, characterized in that, Includes a speed control device for the transmission mechanism as described in any one of claims 1-7.