Rotary kiln gear ring radial run-out detection system

Abstract

The utility model provides a rotary kiln gear ring radial run-out detection system, and belongs to the technical field of rotary kiln gear ring detection. The rotary kiln gear ring radial runout detection system comprises a control module, a pulse generation module, a comparator, a driving module, a laser emission module, a current feedback module and a laser receiving module. The control end of the pulse generation module is connected with the control module, the output end of the pulse generation module is connected with the first input end of the comparator, the output end of the comparator is connected with the input end of the driving module, and the output end of the driving module is connected with the first end of the laser emission module. The second end of the laser emission module is connected with the second input end of the comparator through the current feedback module. The laser transmitting module is used for generating laser signals, and the laser receiving module is connected with the control module and used for receiving the laser signals generated by the laser transmitting module. The timeliness of tooth crest run-out detection of the large gear ring of the rotary kiln can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of rotary kiln gear ring detection, and in particular to a rotary kiln gear ring radial runout detection system. Background Art

[0002] In existing technology, the tooth top runout detection of the rotary kiln's ring gear is primarily performed using manual meter measurement. This method requires slowly rotating the ring gear while the rotary kiln is undergoing maintenance. Several teeth evenly distributed across the ring gear are then selected for measurement. During the measurement process, the runout data for each tooth must be manually recorded and subsequently analyzed. However, this manual measurement method cannot be performed during normal rotary kiln operation and must only be performed when the equipment is shut down for maintenance, which undoubtedly limits the timeliness of the test. Utility Model Content

[0003] The disclosed embodiments provide a rotary kiln gear ring radial runout detection system to improve the timeliness of the tooth top runout detection of the rotary kiln large gear ring.

[0004] The embodiment of the present disclosure provides a rotary kiln gear ring radial runout detection system, comprising: a control module, a pulse generation module, a comparator, a drive module, a laser emission module, a current feedback module and a laser receiving module;

[0005] The control end of the pulse generating module is connected to the control module, the output end of the pulse generating module is connected to the first input end of the comparator, the output end of the comparator is connected to the input end of the driving module, the output end of the driving module is connected to the first end of the laser emitting module, and the second end of the laser emitting module is connected to the second input end of the comparator through the current feedback module;

[0006] The laser emitting module is used to generate a laser signal. The laser receiving module is connected to the control module and is used to receive the laser signal generated by the laser emitting module.

[0007] In an exemplary embodiment of the present disclosure, it further includes: an overvoltage protection module;

[0008] The first end of the overvoltage protection module is connected to the third end of the laser emission module, and the second end of the overvoltage protection module is connected to the input end of the driving module.

[0009] In an exemplary embodiment of the present disclosure, it further includes: a wireless communication module;

[0010] The control module is communicatively connected with the communication terminal via the wireless communication module.

[0011] In an exemplary embodiment of the present disclosure, the comparator includes: an operational amplifier U1;

[0012] The first input end of the operational amplifier U1 is connected to the output end of the pulse generation module, the second input end of the operational amplifier U1 is connected to the current feedback module, and the output end of the operational amplifier U1 is connected to the input end of the driving module.

[0013] In an exemplary embodiment of the present disclosure, the driving module includes: a switch tube Q1;

[0014] The control end of the switch tube Q1 is connected to the output end of the operational amplifier U1 , the first end of the switch tube Q1 is connected to the VCC power supply, and the second end of the switch tube Q1 is connected to the first end of the laser emission module.

[0015] In an exemplary embodiment of the present disclosure, the laser emission module includes: an inductor L1, a diode D2, a laser emitter H1, and a resistor R3;

[0016] The first end of the inductor L1 is connected to the second end of the switch tube Q1, the second end of the inductor L1 is connected to the first end of the resistor R3 through the laser emitter H1, the second end of the resistor R3 is grounded, the cathode of the diode D2 is connected to the first end of the inductor L1, and the anode of the diode D2 is grounded.

[0017] In an exemplary embodiment of the present disclosure, the current feedback module includes: an operational amplifier U2, a resistor R4, and a resistor R5;

[0018] The first input terminal of the operational amplifier U2 is connected to the first end of the resistor R3, the second input terminal of the operational amplifier U2 is grounded through the resistor R5, the output terminal of the operational amplifier U2 is connected to the inverting input terminal of the operational amplifier U2 through the resistor R4, and the output terminal of the operational amplifier U2 is connected to the second input terminal of the operational amplifier U1.

[0019] In an exemplary embodiment of the present disclosure, the overvoltage protection module includes: a varistor RP1, a voltage regulator tube D1 and a switch tube Q2;

[0020] The first end of the variable resistor RP1 is connected to the third end of the laser emission module, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the cathode of the voltage regulator tube D1, the anode of the voltage regulator tube D1 is connected to the control end of the switch tube Q2, the first end of the switch tube Q2 is connected to the input end of the driving module, and the second end of the switch tube Q2 is grounded.

[0021] In an exemplary embodiment of the present disclosure, the laser receiving module includes: a variable resistor RP2, a laser receiver H2, an operational amplifier U3, a resistor R7, and a resistor R8;

[0022] The first end of the variable resistor RP2 is connected to the VCC power supply, the second end of the variable resistor RP2 is connected to the first end of the laser receiver H2, the second end of the laser receiver H2 is grounded, the first end of the laser receiver H2 is connected to the first input end of the operational amplifier U3, the second input end of the operational amplifier U3 is grounded through the resistor R8, the output end of the operational amplifier U3 is connected to the second input end of the operational amplifier U3 through the resistor R7, and the output end of the operational amplifier U3 is connected to the control module.

[0023] The beneficial effects of the rotary kiln gear ring radial runout detection system provided by the embodiment of the present disclosure are as follows: the embodiment of the present disclosure sends instructions to the pulse generation module through the control module to generate a sawtooth pulse signal of a specific frequency and amplitude, and uses the comparator and current feedback module to form a closed-loop control to ensure the stability and accuracy of the laser emission module. After the laser signal is emitted to the rotary kiln gear ring, it is received by the laser receiving module after reflection or scattering, and converted into a processable signal and transmitted to the control module. Based on the received signal, the control module can accurately calculate the radial runout of the gear ring. The embodiment of the present disclosure not only improves the accuracy and real-time performance of the measurement, but also ensures the stability and consistency of the laser emission through a closed-loop control mechanism, thereby reducing the measurement error. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 1 is a schematic structural diagram of a rotary kiln gear ring radial runout detection system provided by an embodiment of the present disclosure;

[0026] Figure 2 This is a circuit diagram of a rotary kiln gear ring radial runout detection system provided by one embodiment of the present disclosure;

[0027] Figure 3 This is a circuit diagram of a rotary kiln gear ring radial runout detection system provided by another embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] To help those skilled in the art better understand this solution, the following will clearly describe the technical solutions in the embodiments of this solution in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of this solution, not all of it. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of this solution.

[0029] Throughout the specification, claims, and accompanying figures of this solution, the term "including" and any variations thereof mean "including, but not limited to," and are intended to cover non-exclusive inclusions and are not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish between different objects, not to describe a specific order.

[0030] The following describes the implementation of the present disclosure in detail with reference to the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the structure of a rotary kiln gear ring radial runout detection system provided by an embodiment of the present disclosure. Figure 1 ,The rotary kiln gear ring radial runout detection system includes: a control module, a pulse generation module, a comparator, a drive module, a laser emission module, a current feedback module and a laser receiving module;

[0032] The control end of the pulse generating module is connected to the control module, the output end of the pulse generating module is connected to the first input end of the comparator, the output end of the comparator is connected to the input end of the driving module, the output end of the driving module is connected to the first end of the laser emitting module, and the second end of the laser emitting module is connected to the second input end of the comparator through the current feedback module;

[0033] The laser transmitting module is used to generate a laser signal. The laser receiving module is connected to the control module. The laser receiving module is used to receive the laser signal generated by the laser transmitting module.

[0034] In this embodiment, during operation, the control module can issue instructions to the pulse generation module. Upon receiving the instructions from the control module, the pulse generation module begins to operate, generates sawtooth pulse signals of a specific frequency and amplitude, and outputs these sawtooth pulse signals to the first input terminal of the comparator.

[0035] The comparator receives both the sawtooth pulse signal from the pulse generator module and the feedback signal from the current feedback module. Its primary function is to compare and analyze these two signals. After this comparison, the pulse generator module outputs a rectangular pulse signal to the driver module.

[0036] After receiving the rectangular pulse signal, the driver module provides the laser emission module with a suitable driving current or voltage. Under the drive of the driver module, the laser emission module generates a laser signal, which is transmitted to the rotary kiln gear ring.

[0037] The operating current of the laser emission module will be monitored in real time by the current feedback module. The current feedback module converts the monitored current signal into a feedback signal and transmits it to the second input terminal of the comparator, forming a feedback loop to adjust the working state of the laser emission module in real time to ensure the stability and accuracy of laser emission.

[0038] The laser receiving module, meanwhile, receives the laser signal generated by the laser transmitting module and reflected or scattered by the rotary kiln gear ring. It converts the signal into an electrical signal or other processable form, transmitting it to the control module. Based on the signal from the laser receiving module, the control module analyzes and calculates the radial runout of the rotary kiln gear ring, enabling precise detection of this runout.

[0039] As can be seen from the above, this embodiment sends instructions to the pulse generation module through the control module to generate a sawtooth pulse signal of a specific frequency and amplitude, and uses a comparator and current feedback module to form a closed-loop control to ensure the stability and accuracy of the laser emission module. After the laser signal is transmitted to the rotary kiln ring gear, it is received by the laser receiving module after reflection or scattering, and converted into a processable signal for transmission to the control module. Based on the received signal, the control module can accurately calculate the radial runout of the ring gear. This embodiment not only improves the accuracy and real-time performance of the measurement, but also ensures the stability and consistency of the laser emission through a closed-loop control mechanism, thereby reducing measurement errors.

[0040] like Figure 1 As shown, in one embodiment of the present disclosure, it further includes: an overvoltage protection module;

[0041] The first end of the overvoltage protection module is connected to the third end of the laser emission module, and the second end of the overvoltage protection module is connected to the input end of the driving module.

[0042] In this embodiment, the overvoltage protection module plays a protective role in the entire rotary kiln gear ring radial runout detection system. It primarily prevents overvoltage in the laser emission module, ensuring system stability and safety. Specifically, it protects the laser emission module and its associated driver module from damage caused by excessive voltage.

[0043] The overvoltage protection module can employ a variety of protection mechanisms. For example, it can include components such as varistors and transient voltage suppressor (TVS) diodes. When an overvoltage is detected, the resistance of the varistor drops sharply as the voltage increases, thereby shunting the excess voltage and preventing it from directly affecting the laser transmitter and driver modules. A transient voltage suppressor diode quickly conducts when the voltage exceeds its breakdown voltage, directing the overvoltage to ground or other safe paths to protect other components in the circuit. The overvoltage protection module shuns or directs the overvoltage at the third terminal of the laser transmitter module to a safe path, restoring the voltage across its terminals (connecting the third terminal of the laser transmitter module and the input terminal of the driver module) to a normal range. This prevents damage to the laser transmitter and driver modules due to overvoltage, ensuring the proper operation and safety of the entire detection system.

[0044] From the above, it can be concluded that adding an overvoltage protection module to the rotary kiln gear ring radial runout detection system can effectively prevent the laser emission module and driver module from being damaged by overvoltage by adopting protection mechanisms such as varistors or transient voltage suppression diodes, ensuring system stability and safety, thereby ensuring the normal operation and long-term reliability of the detection system.

[0045] like Figure 1 As shown, in one embodiment of the present disclosure, it further includes: a wireless communication module;

[0046] The control module is connected to the communication terminal through the wireless communication module.

[0047] In this embodiment, when the system begins operation, the control module receives signals from the laser receiving module, which reflect the laser signal generated by the laser transmitting module and reflected or scattered back by the rotary kiln gear ring. Based on these signals, the control module analyzes and calculates the radial runout data of the rotary kiln gear ring.

[0048] The wireless communication module establishes a wireless communication channel between the control module and the communication terminal. This module can utilize Bluetooth, Wi-Fi, ZigBee, or other technologies. When the control module needs to communicate with the communication terminal, it packages the processed ring gear radial runout data and system status information into a format suitable for wireless transmission and transmits it via the wireless communication module.

[0049] The communication terminal, which can be a computer, tablet, or smartphone, receives and displays information from the detection system. When data from the wireless communication module reaches the terminal, it presents the ring gear radial runout results to the user in an intuitive manner.

[0050] From the above, it can be concluded that the wireless communication module is integrated into the rotary kiln gear ring radial runout detection system, which realizes the wireless connection between the control module and the communication terminal, so that the detection system can transmit the gear ring radial runout data and system status information to computers, tablets or smart phones in real time and remotely, thereby improving the convenience of data transmission and the flexibility of system monitoring.

[0051] like Figure 2 As shown, in one embodiment of the present disclosure, the comparator includes: an operational amplifier U1;

[0052] A first input terminal of the operational amplifier U1 is connected to an output terminal of the pulse generating module, a second input terminal of the operational amplifier U1 is connected to a current feedback module, and an output terminal of the operational amplifier U1 is connected to an input terminal of the driving module.

[0053] In this embodiment, op amp U1 operates by comparing the signals at its two input terminals. When the voltage at the first input terminal (receiving the sawtooth pulse signal) is higher than the voltage at the second input terminal (receiving the feedback signal), op amp U1 outputs a high-level signal. Conversely, when the voltage at the first input terminal is lower than the voltage at the second input terminal, op amp U1 outputs a low-level signal.

[0054] Specifically, op amp U1 determines the difference between its two input signals and determines the output signal level based on the magnitude and polarity of that difference. For example, if the voltage amplitude of the sawtooth pulse signal is significantly greater than that of the feedback signal, op amp U1 will output a high-level rectangular pulse signal sufficient to drive the subsequent driver modules.

[0055] like Figure 2 As shown, in one embodiment of the present disclosure, the driving module includes: a switch tube Q1;

[0056] The control end of the switch tube Q1 is connected to the output end of the operational amplifier U1 , the first end of the switch tube Q1 is connected to the VCC power supply, and the second end of the switch tube Q1 is connected to the first end of the laser emission module.

[0057] In this embodiment, the on and off states of switch Q1 are controlled by the signal output by op amp U1. This signal is generated by comparing the sawtooth pulse signal from the pulse generation module with the feedback signal from the current feedback module. When op amp U1 outputs a high-level signal, switch Q1 turns on; when op amp U1 outputs a low-level signal, switch Q1 turns off.

[0058] When switch Q1 is on, a path is established between the VCC power supply and the first terminal of the laser emitting module. Electrical energy from the VCC power supply is transmitted to the laser emitting module through switch Q1, enabling the module to obtain sufficient drive voltage and current to generate a laser signal. Specifically, this energy excites the laser emitting elements (such as the laser diode) within the module, emitting a laser signal for detecting the rotary kiln ring gear. When switch Q1 is off, the path between the VCC power supply and the laser emitting module is severed, depriving the module of drive power and ceasing laser emission.

[0059] like Figure 2 As shown, in one embodiment of the present disclosure, the laser emission module includes: an inductor L1, a diode D2, a laser emitter H1 and a resistor R3;

[0060] The first end of the inductor L1 is connected to the second end of the switch tube Q1, the second end of the inductor L1 is connected to the first end of the resistor R3 through the laser emitter H1, the second end of the resistor R3 is grounded, the cathode of the diode D2 is connected to the first end of the inductor L1, and the anode of the diode D2 is grounded.

[0061] In this embodiment, when the switch Q1 is turned on, the current from the VCC power supply flows through the switch Q1 into the inductor L1. The inductor L1 is an energy storage element that stores magnetic field energy when current flows through it. As the current gradually increases, the magnetic field energy stored in the inductor L1 also increases. This energy storage characteristic enables the inductor L1 to provide a stable current to the laser emitter H1 in subsequent processes, contributing to the stable emission of the laser. The second end of the inductor L1 is connected to the first end of the resistor R3 through the laser emitter H1. When the inductor L1 stores sufficient energy, this energy can drive the laser emitter H1 to operate. After the laser emitter H1 (typically a component such as a laser diode) obtains sufficient energy, the internal electron transition process is stimulated, thereby emitting laser light.

[0062] The second terminal of resistor R3 is grounded, acting as a current limiter. Diode D2 provides protection. When switch Q1 switches from on to off, the magnetic field energy in inductor L1 changes. According to the law of electromagnetic induction, inductor L1 generates a reverse electromotive force, maintaining the original direction of the current.

[0063] like Figure 2 As shown, in one embodiment of the present disclosure, the current feedback module includes: an operational amplifier U2, a resistor R4 and a resistor R5;

[0064] The first input terminal of the operational amplifier U2 is connected to the first end of the resistor R3, the second input terminal of the operational amplifier U2 is grounded through the resistor R5, the output terminal of the operational amplifier U2 is connected to the inverting input terminal of the operational amplifier U2 through the resistor R4, and the output terminal of the operational amplifier U2 is connected to the second input terminal of the operational amplifier U1.

[0065] In this embodiment, the first input of op amp U2 is connected to the first end of resistor R3. Since resistor R3 is connected in series with laser emitter H1, when laser emitter H1 is operating, the current passing through it generates a voltage drop across resistor R3. This voltage drop reflects the magnitude of the operating current of laser emitter H1, so the first input of op amp U2 can acquire a voltage signal related to the operating current of laser emitter H1. The voltage across resistor R3 is relatively weak, and op amp U2 forms an amplifier circuit for amplifying the voltage across resistor R3. This amplified voltage signal is then sent to the second input of op amp U1 for comparison with the signal at the first input.

[0066] The current feedback module provides the entire system with a way to monitor the operating current of the laser emitter H1 and feeds this current information back to the comparator in the form of a voltage signal. Based on this feedback signal and the pulse signal, the comparator adjusts the output to the driver module (by controlling the switch transistor Q1), thereby dynamically controlling the operating state of the laser emitter module, ensuring stable operation of the laser emitter module and guaranteeing the intensity and stability of the laser emission to meet the requirements of rotary kiln gear ring radial runout detection.

[0067] like Figure 2 As shown, in one embodiment of the present disclosure, the overvoltage protection module includes: a resistor RP1, a voltage regulator tube D1 and a switch tube Q2;

[0068] The first end of the variable resistor RP1 is connected to the third end of the laser emission module, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the cathode of the voltage regulator tube D1, the anode of the voltage regulator tube D1 is connected to the control end of the switch tube Q2, the first end of the switch tube Q2 is connected to the input end of the driving module, and the second end of the switch tube Q2 is grounded.

[0069] In this embodiment, the variable resistor RP1 is used to monitor possible overvoltage conditions on the laser emission module. The variable resistor RP1 adjusts the voltage at its sliding end through the principle of voltage division. When the voltage on the laser emission module is normal, the voltage at the sliding end of the variable resistor RP1 is also within the normal range. When the voltage on the laser emission module increases abnormally, the voltage at the sliding end of the variable resistor RP1 also increases. Once this voltage reaches the breakdown voltage of the voltage regulator D1, the voltage regulator D1 will break down and turn on. When the voltage regulator D1 breaks down and turns on, the control end of the switch Q2 receives sufficient voltage to turn on the switch Q2. When the switch Q2 turns on, it shorts the voltage at the input end of the driver module to ground, thereby preventing excessive voltage from being transmitted to the laser emission module through the driver module, effectively protecting the laser emission module and the driver module from damage due to overvoltage.

[0070] like Figure 3As shown, in one embodiment of the present disclosure, the laser receiving module includes: a variable resistor RP2, a laser receiver H2, an operational amplifier U3, a resistor R7 and a resistor R8;

[0071] A first end of the variable resistor RP2 is connected to the VCC power supply, a second end of the variable resistor RP2 is connected to a first end of the laser receiver H2, a second end of the laser receiver H2 is grounded, the first end of the laser receiver H2 is connected to a first input end of the operational amplifier U3, a second input end of the operational amplifier U3 is grounded through a resistor R8, an output end of the operational amplifier U3 is connected to a second input end of the operational amplifier U3 through a resistor R7, and an output end of the operational amplifier U3 is connected to a control module.

[0072] In this embodiment, a first end of the variable resistor RP2 is connected to the VCC power supply. The variable resistor RP2 can adjust the current passing through it, thereby adjusting the voltage flowing into the subsequent circuit, playing the role of voltage division and adjusting the operating point.

[0073] Laser receiver H2 receives the reflected laser signal and converts it into an electrical signal. The first terminal of laser receiver H2 is connected to the first input of op amp U3, feeding the converted electrical signal into U3 for amplification. The output of op amp U3 is connected to the control module, which transmits the amplified and stabilized signal to the control module. The control module calculates the displacement of the tooth tip relative to the sensor based on principles such as the laser's time of flight or the phase shift of the reflected light. This allows it to accurately capture even subtle changes in tooth tip runout.

[0074] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present disclosure.

Claims

1. A rotary kiln gear ring radial runout detection system, characterized in that: include: Control module, pulse generation module, comparator, drive module, laser emission module, current feedback module and laser receiving module; The control end of the pulse generating module is connected to the control module, the output end of the pulse generating module is connected to the first input end of the comparator, the output end of the comparator is connected to the input end of the driving module, the output end of the driving module is connected to the first end of the laser emitting module, and the second end of the laser emitting module is connected to the second input end of the comparator through the current feedback module; The laser emitting module is used to generate a laser signal. The laser receiving module is connected to the control module and is used to receive the laser signal generated by the laser emitting module.

2. The rotary kiln gear ring radial runout detection system according to claim 1, characterized in that: Also includes: Overvoltage protection module; The first end of the overvoltage protection module is connected to the third end of the laser emission module, and the second end of the overvoltage protection module is connected to the input end of the driving module.

3. The rotary kiln gear ring radial runout detection system according to claim 1, characterized in that: Also includes: Wireless communication module; The control module is communicatively connected with the communication terminal via the wireless communication module.

4. The rotary kiln gear ring radial runout detection system according to claim 1, characterized in that: The comparator includes: an operational amplifier U1; The first input end of the operational amplifier U1 is connected to the output end of the pulse generation module, the second input end of the operational amplifier U1 is connected to the current feedback module, and the output end of the operational amplifier U1 is connected to the input end of the driving module.

5. The rotary kiln gear ring radial runout detection system according to claim 4, characterized in that: The driving module includes: a switch tube Q1; The control end of the switch tube Q1 is connected to the output end of the operational amplifier U1 , the first end of the switch tube Q1 is connected to the VCC power supply, and the second end of the switch tube Q1 is connected to the first end of the laser emission module.

6. The rotary kiln gear ring radial runout detection system according to claim 5, characterized in that: The laser emission module includes: an inductor L1, a diode D2, a laser emitter H1 and a resistor R3; The first end of the inductor L1 is connected to the second end of the switch tube Q1, the second end of the inductor L1 is connected to the first end of the resistor R3 through the laser emitter H1, the second end of the resistor R3 is grounded, the cathode of the diode D2 is connected to the first end of the inductor L1, and the anode of the diode D2 is grounded.

7. The rotary kiln gear ring radial runout detection system according to claim 6, characterized in that: The current feedback module includes: an operational amplifier U2, a resistor R4 and a resistor R5; The first input terminal of the operational amplifier U2 is connected to the first end of the resistor R3, the second input terminal of the operational amplifier U2 is grounded through the resistor R5, the output terminal of the operational amplifier U2 is connected to the inverting input terminal of the operational amplifier U2 through the resistor R4, and the output terminal of the operational amplifier U2 is connected to the second input terminal of the operational amplifier U1.

8. The rotary kiln gear ring radial runout detection system according to claim 2, characterized in that: The overvoltage protection module includes: a resistor RP1, a voltage regulator tube D1 and a switch tube Q2; The first end of the variable resistor RP1 is connected to the third end of the laser emission module, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the cathode of the voltage regulator tube D1, the anode of the voltage regulator tube D1 is connected to the control end of the switch tube Q2, the first end of the switch tube Q2 is connected to the input end of the driving module, and the second end of the switch tube Q2 is grounded.

9. The rotary kiln gear ring radial runout detection system according to claim 1, characterized in that: The laser receiving module includes: a variable resistor RP2, a laser receiver H2, an operational amplifier U3, a resistor R7 and a resistor R8; The first end of the variable resistor RP2 is connected to the VCC power supply, the second end of the variable resistor RP2 is connected to the first end of the laser receiver H2, the second end of the laser receiver H2 is grounded, the first end of the laser receiver H2 is connected to the first input end of the operational amplifier U3, the second input end of the operational amplifier U3 is grounded through the resistor R8, the output end of the operational amplifier U3 is connected to the second input end of the operational amplifier U3 through the resistor R7, and the output end of the operational amplifier U3 is connected to the control module.

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