Uncoiler head roll diameter measuring device based on laser range finder

Abstract

This invention discloses a device for measuring the roll diameter of an uncoiler head based on a laser rangefinder, belonging to the field of roll diameter measurement technology. The device includes an uncoiler, a lifting machine, an uncoil assembly, an automatic cleaning and detection assembly, and a roll diameter measurement and control system. The detection assembly integrates a laser rangefinder sensor and a blowpipe. The roll diameter measurement and control system includes a data acquisition module, a data analysis and processing module, and an execution control module. The data acquisition module completes multi-source data acquisition and analog-to-digital conversion. The data analysis and processing module performs data filtering, roll diameter calculation, and sensor contamination determination. The execution control module triggers automatic blowpipe cleaning, adjusts the tension and speed of the uncoiler in conjunction with the uncoiler, and coordinates the lifting machine's movement. The blowpipe can perform graded cleaning according to the contamination level. This device eliminates dust interference with detection, ensures stable roll diameter measurement data, and achieves automatic cleaning of the laser rangefinder sensor, constant tension closed-loop control of the uncoiler, and coordinated operation of the equipment.

Description

Technical Field

[0001] This invention relates to the field of roll diameter measurement technology, and in particular to a roll diameter measurement device for unwinding machines based on a laser rangefinder. Background Technology

[0002] Uncoiling machines are the core starting equipment in automated metal processing and stamping production lines. They primarily handle the unwinding, tension control, and continuous feeding of coiled metal sheets. The coil head and drum, as the core load-bearing and unloading component of the uncoiler, require real-time diameter detection as a crucial technological step to achieve constant tension control, speed matching, and automated coil changing. Currently, coil head diameter detection mainly falls into three categories: mechanical structure inspection, laser inspection, and ultrasonic inspection. Among these, laser inspection, due to its balanced accuracy and adaptability to various environments, has become the most widely used method in the industry.

[0003] Existing laser inspection devices have significant technical defects in practical applications: dust in industrial processing environments easily adheres to the surface of the laser rangefinder sensor lens, directly causing fluctuations in inspection data and poor measurement stability; at the same time, the device lacks a complete measurement and control system, and can only achieve basic distance data acquisition, unable to complete data processing and sensor contamination status determination, and sensor cleaning relies heavily on manual operation, resulting in insufficient response time; in addition, there is no linkage control mechanism between roll diameter detection data and unwinding machine operating parameters, making it impossible to achieve constant tension closed-loop adjustment, which greatly reduces the automation level and operational stability of unwinding operations. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a laser rangefinder-based device for measuring the diameter of the unwinding machine head.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a laser rangefinder-based uncoiling machine head diameter measuring device, comprising an uncoiling machine horizontally mounted and fixed on the ground, wherein a lifting machine is horizontally slidably mounted on the front end of the uncoiling machine, characterized in that: an uncoiling assembly is mounted and fixed on the front end face of the uncoiling machine, a support tube is mounted and fixed on one side of the uncoiling assembly on the front end face of the uncoiling machine, and an automatically cleanable detection assembly is mounted and fixed on the support tube, wherein the detection assembly includes a laser rangefinder sensor and a blowing pipe for purging;

[0006] It is also equipped with a roll diameter measurement and control system; the roll diameter measurement and control system includes a data acquisition module, a data analysis and processing module, and an execution control module;

[0007] The data acquisition module is used to acquire distance detection data from the laser rangefinder, running speed and tension data of the uncoiler, and position and action status data of the jacking machine. After converting analog data to digital data, it transmits the data to the data analysis and processing module.

[0008] The data analysis and processing module is used to process and analyze the received digital data to generate roll head diameter detection results, sensor contamination judgment signals, and equipment operation adjustment instructions. The execution control module executes corresponding control actions according to the output signals of the data analysis and processing module. The software and hardware of each module, together with the uncoiling component and the detection component, realize the real-time detection of the roll head diameter of the uncoiling machine, the automatic cleaning of the laser rangefinder sensor, the closed-loop linkage adjustment of the operating parameters of the uncoiling machine, and the coordinated control of the actions of the lifting machine and the uncoiling machine.

[0009] Preferably, the uncoiling assembly includes a sliding disc mounted and fixed on the front end face of the uncoiling machine, and a telescopic shaft is coaxially slidably inserted on the sliding disc, with the rear end of the telescopic shaft connected and fixed to a hydraulic cylinder.

[0010] Preferably, a sliding frame is fitted on the outer side of the telescopic shaft, and the front end of the sliding frame is connected and fixed to the telescopic shaft by connecting bolts.

[0011] Preferably, the outer side of the sliding frame is hinged with multiple connecting rods, and the other end of each connecting rod is hinged with a sector plate, the rear end of which is slidably connected to the sliding disk.

[0012] Preferably, the detection component includes a support tube mounted and fixed on the uncoiler, a laser rangefinder sensor is mounted and fixed on the front end of the support tube, and a data cable is connected to the rear end of the laser rangefinder sensor.

[0013] Preferably, the outer side of the support tube is fitted with a fixed blowpipe, and the outlet of the fixed blowpipe is aligned with the laser rangefinder sensor.

[0014] Preferably, the data analysis and processing module sequentially filters and performs geometric calculations on the distance detection data to obtain the real-time roll diameter value of the uncoiler head, and simultaneously calculates the rate of change of the roll diameter value; the data analysis and processing module monitors the fluctuation value of the distance detection data in real time, and determines the degree of contamination of the laser rangefinder sensor by the fluctuation value.

[0015] Preferably, the data analysis and processing module has a built-in pollution judgment threshold and a roll diameter change rate threshold. When the fluctuation value of the distance detection data is greater than the pollution judgment threshold, the data analysis and processing module sends a cleaning trigger signal to the execution control module. The execution control module controls the air supply equipment to start and realize the purging and cleaning of the laser rangefinder sensor. When the roll diameter change rate is greater than the roll diameter change rate threshold, the data analysis and processing module sends a parameter adjustment signal to the execution control module. The execution control module adjusts the tension and running speed of the uncoiler in linkage according to the real-time roll diameter value to realize constant tension control of the uncoiler.

[0016] Preferably, the data acquisition module and the data analysis and processing module are integrated into an industrial control computer, and the execution control module is a PLC controller. The industrial control computer and the PLC controller are connected via industrial Ethernet communication. A flow regulating valve is installed on the air supply device of the blowpipe. The flow regulating valve is electrically connected to the PLC controller. The data analysis and processing module has built-in multi-level pollution judgment standards. The PLC controller adjusts the opening of the flow regulating valve according to the pollution level to realize the graded blowing and cleaning of the laser rangefinder sensor.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This invention and solution achieve automatic cleaning of the laser rangefinder sensor by configuring a blowpipe in the detection component and combining it with the pollution judgment and execution control module of the roll diameter measurement and control system. It can remove dust from the sensor surface in real time, eliminate the interference of dust on the detection signal, ensure the continuous and stable output of roll diameter detection data, and eliminate the need for manual intervention in cleaning operations, thereby reducing equipment maintenance costs and fundamentally solving the problem of detection failure caused by environmental pollution in traditional laser detection devices.

[0019] 2. This solution uses an integrated roll diameter measurement and control system. The data acquisition module completes multi-source data acquisition and analog-to-digital conversion, and the data analysis and processing module realizes data filtering, roll diameter calculation and status determination. The execution control module outputs control commands, and a hardware and software collaborative measurement and control framework is constructed to realize integrated control of roll diameter detection, sensor cleaning, unwinder and lifting machine operation. This solves the problems of data acquisition distortion and poor control coordination in traditional devices and improves the overall automation level of the device.

[0020] 3. This solution uses a data analysis and processing module to calculate the real-time coil diameter and its rate of change. The execution control module then adjusts the tension and operating speed of the uncoiler based on the detected data, achieving constant tension closed-loop control of the uncoiler. This adapts to the dynamic changes in coil diameter during the unwinding process, ensuring smooth sheet material conveying and solving the problem of insufficient operational stability caused by tension fluctuations in traditional devices. It also improves the control accuracy and operational reliability of the unwinding operation.

[0021] In summary, this solution, through the coordinated operation of the automatic cleaning and detection component and the integrated roll diameter measurement and control system, simultaneously solves three core problems of traditional laser detection devices: sensor contamination interference, fragmented measurement and control logic, and lack of linkage of operating parameters. It achieves accurate and stable detection of the roll diameter of the uncoiler head, automatic cleaning of the laser rangefinder sensor, constant tension closed-loop control of the uncoiler, and coordinated operation of equipment actions, comprehensively improving the detection stability, automation level, and industrial adaptability of the device. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a three-dimensional schematic diagram of the overall appearance of the device proposed in this invention;

[0024] Figure 2 This is a three-dimensional schematic diagram of the unwinding component structure proposed in this invention;

[0025] Figure 3 This is an exploded view of the unwinding assembly structure proposed in this invention;

[0026] Figure 4 This is a three-dimensional schematic diagram of the detection component structure proposed in this invention;

[0027] Figure 5 This is a block diagram showing the module connection of the roll diameter measurement and control system proposed in this invention;

[0028] Figure 6 This is a block diagram of the system measurement and control principle proposed in this invention.

[0029] The following are the components listed in the diagram: 1. Sliding disc; 2. Telescopic shaft; 3. Hydraulic cylinder; 4. Sliding frame; 5. Connecting bolt; 6. Sector plate; 7. Connecting rod; 8. Support pipe; 9. Laser rangefinder sensor; 10. Data cable; 11. Binding ring; 12. Blowpipe; 13. Uncoiler; 14. Lifting machine. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] See Figures 1 to 4The laser rangefinder-based unwinding head diameter measuring device of this invention includes an unwinding machine 13 horizontally installed and fixed on the ground. A lifting machine 14 is horizontally slidably installed at the front end of the unwinding machine 13. An unwinding assembly is installed and fixed on the front face of the unwinding machine 13. A support tube 8 is installed and fixed on one side of the unwinding assembly at the front face of the unwinding machine 13. An automatically cleanable detection assembly is installed and fixed on the support tube 8. The reasonable layout and assembly of the above components realize the coordinated linkage of various functions of the device, which not only ensures the smooth and orderly unwinding and lifting actions, but also provides a stable installation foundation for the accurate detection of the head diameter, effectively improving the overall operational reliability and practicality of the device, and ensuring that subsequent unwinding and detection work can be efficiently connected and carried out smoothly.

[0032] Reference Figure 2 and Figure 3 As shown, the uncoiling assembly includes a sliding disc 1 fixedly mounted on the front face of the uncoiling machine 13. A telescopic shaft 2 is coaxially slidably inserted on the sliding disc 1. The rear end of the telescopic shaft 2 is connected and fixed to a hydraulic cylinder 3. A sliding frame 4 is sleeved on the outer side of the telescopic shaft 2. The front end of the sliding frame 4 is connected and fixed to the telescopic shaft 2 by connecting bolts 5. Multiple connecting rods 7 are hinged around the outer side of the sliding frame 4. A sector plate 6 is hinged to the other end of the connecting rods 7. The rear end of the sector plate 6 is slidably connected to the sliding disc 1. This uncoiling assembly drives the telescopic shaft 2 to extend and retract through the hydraulic cylinder 3, which in turn moves the sliding frame 4. The connecting rods 7 then drive the sector plate 6 to open and close. This structural design can adapt to steel coils of different diameters, achieving a firm clamping of the steel coil and preventing the steel coil from shifting or shaking during the uncoiling process. At the same time, the fixing method of the connecting bolts 5 ensures the stability of the connection between the sliding frame 4 and the telescopic shaft 2. The sliding cooperation between the sliding disc 1 and the sector plate 6 ensures the smoothness of the opening and closing action of the sector plate 6, effectively improving the stability and safety of the uncoiling operation.

[0033] Reference Figure 4As shown, the detection assembly includes a support tube 8 fixedly mounted on the uncoiler 13. A laser rangefinder 9 is fixedly mounted on the front end of the support tube 8, and a data cable 10 is connected to the rear end of the laser rangefinder 9. A blowpipe 12 is fixedly mounted on the outer side of the support tube 8 via a binding ring 11. The outlet of the fixed blowpipe 12 is aligned with the laser rangefinder 9. Through the detection assembly, the device can blow away the dust accumulated on the sensor using high-pressure air while performing laser detection, thereby avoiding dust interference with the detection work and improving detection stability. The support tube 8 provides stable mounting support for the laser rangefinder 9 and the blowpipe 12, ensuring accurate and consistent detection position. The laser rangefinder 9 can capture changes in the roll diameter in real time, and the data cable 10 can quickly transmit the detection data to the control terminal, providing data support for subsequent adjustments. The binding ring 11 ensures the secure installation of the blowpipe 12, ensuring that its airflow direction is always aligned with the laser rangefinder 9. The automatic cleaning function requires no manual intervention, reducing maintenance costs and avoiding detection errors caused by dust obscuring the sensor field lens, further ensuring the accuracy and continuity of roll diameter measurement.

[0034] Reference Figures 5 to 6 The present invention is also equipped with a roll diameter measurement and control system; the roll diameter measurement and control system includes a data acquisition module, a data analysis and processing module and an execution control module;

[0035] The data acquisition module is electrically connected to the laser rangefinder 9, the operating status detection unit of the uncoiler 13, and the position and motion detection unit of the jacking machine 14. The data analysis and processing module is bidirectionally connected to the data acquisition module. The signal input terminal of the execution control module is connected to the signal output terminal of the data analysis and processing module. The execution output terminal of the execution control module is electrically connected to the air supply equipment of the blowpipe 12, the operation control unit of the uncoiler 13, and the drive control unit of the jacking machine 14.

[0036] The data acquisition module is used to acquire distance detection data from the laser rangefinder 9, operating speed and tension data from the uncoiler 13, and position and motion status data from the lifting machine 14. It also performs analog-to-digital data conversion using an analog-to-digital conversion quantization algorithm. (in the formula) This is the digital output value after analog-to-digital conversion. The analog voltage signal input to the laser rangefinder 9. The reference voltage for the analog-to-digital converter (ADC) is N, where N is the effective number of bits for the ADC. After processing (the quantization range coefficients for analog-to-digital conversion), the data is transmitted to the data analysis and processing module.

[0037] The data analysis and processing module incorporates a data fusion algorithm, a roll diameter geometric calculation model, and a contamination status monitoring model. It processes and analyzes the received digital data to generate roll head diameter detection results, sensor contamination judgment signals, and equipment operation adjustment commands. The execution control module executes corresponding control actions based on the output signals of the data analysis and processing module. The modules, along with the unwinding and detection components, work together in hardware and software to achieve real-time detection of the unwinder roll head diameter, automatic cleaning of the laser rangefinder 9, closed-loop linkage adjustment of the unwinder 13's operating parameters, and coordinated control of the actions of the lifting machine 14 and the unwinder 13. Standardized analog-to-digital conversion algorithms ensure data acquisition accuracy, and a hardware-software collaborative intelligent measurement and control framework is constructed to solve the problems of data acquisition distortion and fragmented control logic in traditional devices, providing underlying algorithmic support for accurate roll diameter detection and automatic control.

[0038] Furthermore, the data analysis and processing module sequentially applies a weighted moving average filtering algorithm and a Kalman filtering fusion algorithm to the distance detection data for noise reduction. The filtering formula is as follows: (This formula is a weighted moving average filter.) Let i be the filtered output data for the nth sampling point; i is the sequence number of the sampling point, ranging from n−N1+1 to n; in this formula, N1 is the width of the sliding filter window, which is a positive integer; satisfying... , which is the weighted coefficient normalization constraint; This is the filtered data. The dynamic weighting coefficients corresponding to the i-th sampling point are: (This refers to the original distance detection data for the i-th sampling point).

[0039] (This formula is the Kalman filter gain formula.) Here, k represents the Kalman filter gain coefficient at step k, and k is the filter iteration step number. Let H be the prior estimation error covariance matrix at step k, and H be the observation matrix. (where R is the transpose of the observation matrix and R is the observation noise covariance).

[0040] Then, using the geometric calculation formula for the roll diameter Obtain the real-time roll diameter value of the uncoiler head. Simultaneously, through the differential algorithm of roll diameter change rate Calculate the rate of change of the roll diameter value In the formula, t represents the real-time roll diameter of the uncoiler head at time t; t is the real-time detection time. This is the fixed distance from the laser rangefinder 9 to the reference position at the head of the roll; The distance detected in real time by laser rangefinder 9 at time t; The real-time roll diameter at time t; for The historical volume of moments; The detection time interval is a fixed positive value.

[0041] Using the root mean square algorithm of data fluctuation The fluctuation value S of the distance detection data is monitored in real time, and the degree of contamination of the laser rangefinder 9 is determined by comparing the fluctuation value with the preset benchmark value; where n is the total number of statistical sampling points; i is the serial number of the statistical sampling point, and the value range is from 1 to n; This represents the original detection data for the i-th sampling point; This represents the average value of the detection data within the statistical period.

[0042] Furthermore, the data analysis and processing module has a built-in pollution detection threshold. With the threshold of the rate of change of roll diameter Through threshold comparison algorithm Generate a trigger signal;

[0043] when At that time, a cleaning trigger signal is sent to the execution control module; the execution control module controls the air supply equipment to start and realize the purging and cleaning of the laser rangefinder 9;

[0044] when At that time, the data analysis and processing module sends parameter adjustment signals to the execution control module, which then uses a constant tension PID closed-loop control algorithm and tension calculation formula. In the formula The real-time output tension of the uncoiler at time t. The reference tension for the uncoiler The initial diameter of the steel coil. This is the tension adjustment proportional coefficient. The reference rate for the change in roll diameter; The real-time roll diameter at time t; This represents the real-time rate of change of roll diameter;

[0045] The tension and running speed of the uncoiler 13 are adjusted in conjunction with the real-time roll diameter value to achieve constant tension control of the uncoiler 13; the automatic and precise triggering of cleaning and control actions is achieved through threshold comparison algorithm, and the constant tension adjustment formula is adapted to the dynamic changes of roll diameter, which completely solves the problem of sheet deformation caused by tension fluctuation during the uncoiling process and improves the stability of uncoiling operation.

[0046] Furthermore, the data acquisition module and the data analysis and processing module are integrated into an industrial control computer, and the execution control module is a PLC controller. The industrial control computer and the PLC controller realize data interaction through the industrial Ethernet Modbus TCP communication algorithm.

[0047] A flow regulating valve is installed on the air supply equipment of blowpipe 12. The flow regulating valve is electrically connected to the PLC controller. The data analysis and processing module uses a pollution level quantification algorithm. (G represents the pollution level) The PLC controller incorporates multi-level pollution judgment standards (based on a baseline fluctuation threshold) and is based on a flow rate adjustment algorithm. ( For the real-time opening degree of the flow regulating valve, G represents the reference opening degree of the flow control valve, and G represents the real-time contamination level. (Based on the pollution level benchmark value) The opening of the flow regulating valve is adjusted according to the pollution level to achieve graded purging cleaning of the laser rangefinder sensor 9; the industrial control computer combined with PLC architecture effectively adapts to industrial site conditions, and the graded purging algorithm avoids over-purging or insufficient cleaning, saving air source while improving cleaning efficiency and extending sensor life.

[0048] The working principle of this invention is as follows:

[0049] After the device is powered on, the lifting machine 14 operates, lifting the steel coil to the loading position. The lifting machine 14 moves horizontally, so that the steel coil is sleeved on the outside of the sector plate 6 of the uncoiling assembly.

[0050] The hydraulic cylinder 3 drives the telescopic shaft 2 to retract backward along the sliding disk 1. The telescopic shaft 2 drives the sliding frame 4 to move synchronously. The sliding frame 4 pushes the sector plate 6 to slide outward along the sliding disk 1 through the connecting rod 7. The sector plate 6 supports the steel coil.

[0051] The lifting machine 14 descends and separates from the steel coil. The lifting machine 14 returns to its horizontal position, and the steel coil clamping is completed.

[0052] The uncoiler 13 operates and conveys the steel coil, while the laser rangefinder 9 collects the distance data of the sector plate 6 in real time.

[0053] The data acquisition module of the roll diameter measurement and control system collects distance data from the laser rangefinder 9, running speed and tension data of the uncoiler 13, and position and action status data of the lifting machine 14. After completing the analog-to-digital conversion, the data is transmitted to the data analysis and processing module.

[0054] The data analysis and processing module performs filtering and geometric calculations on the distance data, outputs the real-time roll diameter value and roll diameter change rate, and monitors the fluctuation value of the distance data to determine the contamination status of the laser rangefinder 9.

[0055] The data analysis and processing module transmits the roll diameter detection results, contamination judgment signals, and equipment operation adjustment instructions to the execution control module.

[0056] After receiving the signal, the execution control module executes the corresponding control action: when the laser rangefinder 9 meets the pollution judgment condition, the execution control module starts the air supply equipment of the blowpipe 12, and the blowpipe 12 sprays gas to the laser rangefinder 9 to remove pollutants from the sensor surface; when the roll diameter change rate exceeds the set threshold, the execution control module adjusts the tension and running speed of the uncoiler 13 according to the real-time roll diameter value to maintain the constant tension operation of the uncoiler 13.

[0057] After the steel coil is conveyed, the execution control module controls the uncoiler 13 to stop, and the operation of the device ends.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser rangefinder-based uncoiling machine head diameter measuring device, comprising an uncoiling machine (13) horizontally mounted and fixed on the ground, wherein a lifting machine (14) is horizontally slidably mounted at the front end of the uncoiling machine (13), characterized in that: An unwinding assembly is installed and fixed on the front end face of the unwinding machine (13). A support tube (8) is installed and fixed on one side of the unwinding assembly on the front end face of the unwinding machine (13). An automatic cleaning detection assembly is installed and fixed on the support tube (8). The detection assembly includes a laser rangefinder (9) and a blowpipe (12) for purging. It is also equipped with a roll diameter measurement and control system; the roll diameter measurement and control system includes a data acquisition module, a data analysis and processing module, and an execution control module; The data acquisition module is used to acquire distance detection data from the laser rangefinder (9), running speed and tension data from the unwinder (13), and position and action status data from the lifting machine (14), and transmits the data to the data analysis and processing module after completing the conversion of analog data to digital data. The data analysis and processing module is used to process and analyze the received digital data to generate roll head diameter detection results, sensor contamination judgment signals and equipment operation adjustment instructions. The execution control module executes corresponding control actions according to the output signal of the data analysis and processing module. Each module works in conjunction with the unwinding component and the detection component to realize real-time detection of the roll head diameter of the unwinding machine, automatic cleaning of the laser rangefinder (9), closed-loop linkage adjustment of the operating parameters of the unwinding machine (13), and coordinated control of the actions of the lifting machine (14) and the unwinding machine (13).

2. The unwinding machine head diameter measuring device based on a laser rangefinder according to claim 1, characterized in that: The unwinding assembly includes a sliding disk (1) mounted and fixed on the front end face of the unwinder (13), and a telescopic shaft (2) is coaxially slidably inserted on the sliding disk (1), with the rear end of the telescopic shaft (2) connected and fixed on the oil cylinder (3).

3. The unwinding machine head diameter measuring device based on a laser rangefinder according to claim 2, characterized in that: The telescopic shaft (2) is fitted with a sliding frame (4) on its outer side, and the front end of the sliding frame (4) is connected to and fixed to the telescopic shaft (2) by a connecting bolt (5).

4. The unwinding machine head diameter measuring device based on a laser rangefinder according to claim 3, characterized in that: The sliding frame (4) has multiple connecting rods (7) hinged around its outer side. The other end of the connecting rod (7) is hinged to a sector plate (6), and the rear end of the sector plate (6) is slidably connected to the sliding disk (1).

5. The unwinding machine head diameter measuring device based on a laser rangefinder according to claim 1, characterized in that: The detection component includes a support tube (8) mounted and fixed on the unwinder (13), a laser rangefinder (9) mounted and fixed on the front end of the support tube (8), and a data cable (10) connected to the rear end of the laser rangefinder (9).

6. The unwinding machine head diameter measuring device based on a laser rangefinder according to claim 5, characterized in that: The outer side of the support tube (8) is fitted with a fixed blowpipe (12) by a binding ring (11), and the outlet of the fixed blowpipe (12) is aligned with the laser rangefinder (9).

7. The unwinding machine head diameter measuring device based on a laser rangefinder according to claim 1, characterized in that: The data analysis and processing module sequentially filters and performs geometric calculations on the distance detection data to obtain the real-time roll diameter value of the unwinding machine head, and simultaneously calculates the rate of change of the roll diameter value; the data analysis and processing module monitors the fluctuation value of the distance detection data in real time, and determines the degree of contamination of the laser rangefinder (9) by the fluctuation value.

8. The unwinding machine head diameter measuring device based on a laser rangefinder according to claim 7, characterized in that: The data analysis and processing module has a built-in pollution judgment threshold and a roll diameter change rate threshold. When the fluctuation value of the distance detection data is greater than the pollution judgment threshold, the data analysis and processing module sends a cleaning trigger signal to the execution control module. The execution control module controls the air supply equipment to start and realizes the purging and cleaning of the laser rangefinder (9). When the roll diameter change rate is greater than the roll diameter change rate threshold, the data analysis and processing module sends a parameter adjustment signal to the execution control module. The execution control module adjusts the tension and running speed of the uncoiler (13) in linkage according to the real-time roll diameter value to realize constant tension control of the uncoiler (13).

9. The unwinding machine head diameter measuring device based on a laser rangefinder according to claim 1, characterized in that: The data acquisition module and the data analysis and processing module are integrated into an industrial control computer, and the execution control module is a PLC controller. The industrial control computer and the PLC controller are connected via industrial Ethernet communication. A flow regulating valve is installed on the air supply device of the blowpipe (12). The flow regulating valve is electrically connected to the PLC controller. The data analysis and processing module has a built-in multi-level pollution judgment standard. The PLC controller adjusts the opening of the flow regulating valve according to the pollution level to realize the graded blowing and cleaning of the laser ranging sensor (9).

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