Ultrasonic coil diameter detection system and detection method

Abstract

The invention discloses an ultrasonic coil diameter detection system which comprises a detection device and a transmission device. The detection device comprises a graduated scale, a top plate and a clamping sleeve, and the clamping sleeve is slidably connected to the graduated scale; the detection device further comprises a support, and an ultrasonic detection sensor is installed on the support. The detection device further comprises a PLC and a remote monitoring module. The invention also discloses an ultrasonic coil diameter detection method, which comprises the following steps of: arranging a detected object on the transmission device for unwinding, determining the axis, the small diameter and the large diameter of the detected object, determining the analog quantity of the ultrasonic detection sensor at the near point and the far point by taking the tangent point of the small diameter and the top plate as the near point and the tangent point of the large diameter and the top plate as the far point, and inputting the analog quantity into the PLC to obtain a reading. And determining the radius of any point of the measured object so as to obtain the rolling diameter. According to the invention, the diameter of the reel material film can be accurately detected, the detection result is displayed on the human-computer interface, and the technical problem that the diameter of the reel material film cannot be accurately detected and displayed on the human-computer interface by the existing mechanism is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of coating machinery and control, and in particular relates to an ultrasonic coil diameter detection system and also relates to an ultrasonic coil diameter detection method. Background Art

[0002] With the improvement of coating machine control accuracy and the improvement of scrap control rate in the production process of coating machines, the requirements for the stability of winding and unwinding tension are becoming higher and higher. There are two main methods for calculating the initial roll diameter of the equipment: one is to manually measure and input it into the human-machine interface, which is transmitted to the PLC by the human-machine interface. The PLC gives the initial speed according to the set initial roll diameter. The manual input diameter is not accurate enough. On the other hand, the operator is required to be strict, and there is often a situation of unstable starting tension caused by forgetting to input the initial roll diameter; the second is to let the traction roller close the pressure under the tension input state, and calculate the initial diameter by testing the material length from the maximum swing amplitude to the middle position of the swing roller and the angle of the motor rotation. This detection method is relatively accurate in principle when there is communication between the motor and the PIC, but in the actual operation process, the encoder we selected transmits the signal according to the pulse, and the signal point of the pulse may not be able to accurately obtain the maximum swing amplitude point and the middle point of the swing roller, so a large error will be generated in the calculation process. Summary of the invention

[0003] The first purpose of the present invention is to provide an ultrasonic roll diameter detection system that can accurately detect the diameter of the roll film and display the detection results on the human-machine interface, effectively solving the technical problem that the existing mechanism cannot accurately detect the diameter of the roll film and display it on the human-machine interface.

[0004] A second object of the present invention is to provide an ultrasonic roll diameter detection method.

[0005] The first technical solution adopted by the present invention is an ultrasonic roll diameter detection system, which includes a detection device and a transmission device; the transmission device is used to drive the object to be measured to rotate; the detection device includes a scale, one end of the scale is fixedly connected to a top plate for positioning and detecting the roll diameter section, the top plate is perpendicular to the scale, the scale is circumferentially slidably connected to a ferrule, and the ferrule is slidably connected to the scale; the detection device also includes a bracket, an ultrasonic detection sensor is installed on the bracket, and the light beam of the ultrasonic detection sensor is perpendicular to the top plate; the detection device also includes a PLC controller, the ultrasonic detection sensor is signal-connected to the PLC controller, and the PLC controller is also signal-connected to a remote monitoring module.

[0006] The first technical solution of the present invention is also characterized in that: The PLC controller is connected to an environmental monitoring module, which is used to monitor the temperature, humidity and electromagnetic field strength of the surrounding environment in real time and transmit the data to the PLC controller. The PLC controller compensates and corrects the measurement results of the ultrasonic displacement sensor according to the environmental data.

[0007] A groove is arranged on the side wall of the inner cavity of the ferrule, the scale slides in the groove, a limit spring is fixedly connected to the bottom wall of the ferrule, and the scale is connected to the limit spring.

[0008] The bracket is provided with scale markings and fine-tuning devices for quick and accurate installation of ultrasonic detection sensors.

[0009] The second technical solution adopted by the present invention is an ultrasonic reel diameter detection method, which adopts the ultrasonic reel diameter detection system as mentioned above. First, the object to be measured is mounted on the transmission device for unwinding, and its axis, minor diameter and major diameter are clearly identified. Next, the ruler is installed in the ferrule, and the ruler is moved to drive the top plate to determine the intersection point with the object to be measured. Then, the ferrule is fixed to ensure that the light beam of the ultrasonic detection sensor is parallel to the ruler and perpendicular to the top plate. The intersection point of the minor diameter and the top plate is the near point, and the intersection point of the major diameter and the top plate is the far point. The analog value of the ultrasonic detection sensor at the near point and the far point is confirmed, and the analog value is input into the PLC controller to obtain the readings of the near point and the far point in the PLC. The radius at any point of the object to be measured is confirmed, thereby obtaining the reel diameter.

[0010] The second technical solution of the present invention is also characterized in that: The ultrasonic coil diameter detection method is specifically implemented according to the following steps: S1: The object to be measured is mounted on the transmission device for unwinding. The axis of the object to be measured is recorded as O, the minor diameter of the object to be measured is recorded as r, and the major diameter of the object to be measured is recorded as R; S2: Install the scale in the ferrule, move the scale to drive the top plate to determine the tangent point between the object to be measured and the top plate, and then fix the ferrule on the bracket to ensure that the beam of the ultrasonic detection sensor is parallel to the scale and perpendicular to the top plate; S3: The center of the object to be measured is O, the tangent point between the minor diameter r of the object to be measured and the top plate is A, the tangent point between the major diameter R of the object to be measured and the top plate is B, the intersection of the scale and the ferrule is C, and the position of the ultrasonic detection sensor is D; S4: Take point A as the far point and point B as the near point, confirm the analog value of the ultrasonic detection sensor at the near point and the far point; input the analog value into the PLC controller to obtain the readings of the near point and the far point in the PLC controller; according to the minor diameter r, the major diameter R and the readings of the PLC controller, the radius y and the ultrasonic analog value x of the object to be measured at any point are obtained, and the object to be measured is driven to rotate through the transmission device to detect the winding diameter of the object to be measured at any point.

[0011] S4 is as follows: point A is determined as the far point, and the analog value of the ultrasonic wave corresponding to r corresponds to the reading of 0 in the PLC; point B is determined as the near point, and the analog value of the ultrasonic wave corresponding to R corresponds to the reading of D in the PLC controller. According to the direct proportional function of the two points A (0, r) and B (C, R), the relationship between the radius y and the analog value x at any point is determined as shown in the following formula:

[0012] In the formula, y represents the radius at any point of the measured object, R represents the major diameter of the measured object, r represents the minor diameter of the measured object, x represents the analog value at any point of the measured object, and D represents the analog value of the ultrasound corresponding to R, which corresponds to the reading in the PLC controller.

[0013] In S4, the ultrasonic displacement sensor transmits the measurement data to the PLC controller. When the PLC controller receives the measurement data, it combines the temperature, humidity and electromagnetic field strength data provided by the current environmental monitoring module and dynamically compensates and corrects the measurement results of the ultrasonic displacement sensor through a pre-set compensation algorithm model.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention determines the size parameters of the roll film through the coordinated action of a scale, a top plate, and a ferrule, and determines the diameter of the roll film at any point in combination with an ultrasonic detection sensor and a PLC controller. Through a remote monitoring module, the diameter of the roll film can be accurately detected and displayed on a human-machine interface. The diameter of the roll film can be accurately detected and the detection result can be displayed on a human-machine interface, effectively solving the technical problem that the existing mechanism cannot accurately detect the diameter of the roll film and display it on a human-machine interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the ultrasonic roll diameter detection system of the present invention; Figure 2 It is a schematic diagram of the structure of the scale in the ultrasonic coil diameter detection system of the present invention; Figure 3 It is a schematic diagram of the connection structure between the scale and the top plate in the ultrasonic roll diameter detection system of the present invention; Figure 4 It is a calculation principle diagram of the ultrasonic coil diameter detection method of the present invention; Figure 5 It is a schematic diagram of the circuit principle of the ultrasonic coil diameter detection method of the present invention; In the figure, 1. roll film, 2. detection device, 3. ultrasonic detection sensor, 4. bracket, 5. top plate, 6. scale, 7. ferrule. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] Example 1 like Figure 1-3 As shown, the ultrasonic roll diameter detection system disclosed in this embodiment includes a detection device and a transmission device; the transmission device is used to drive the object to be detected to rotate; the detection device includes a scale 6, one end of the scale 6 is fixedly connected to a top plate 5 for positioning and detecting the roll diameter section, the top plate 5 is perpendicular to the scale 6, the scale 6 is circumferentially slidably connected to a clamping sleeve 7, and the clamping sleeve 7 is slidably connected to the scale 6; the detection device also includes a bracket 4, an ultrasonic detection sensor 3 is installed on the bracket 4, and the light beam of the ultrasonic detection sensor 3 is perpendicular to the top plate 5; the detection device also includes a PLC controller, the ultrasonic detection sensor 3 is signal-connected to the PLC controller, and the PLC controller is also signal-connected to a remote monitoring module.

[0018] In this embodiment, after the detection device is installed and the roll diameter of the object to be measured is determined, the object to be measured is driven to rotate. At this time, the roll diameter of the object to be measured changes, and the detection device measures the changed roll diameter. The scale 6 is used to measure the specific value of the roll diameter. The top plate 5 is used to determine the cross section of the roll diameter of the object to be measured. The ferrule 7 is used to cooperate with the scale 6 to confirm the length of the object to be measured at the small diameter and large diameter. The bracket 4 is used to install and fix the ultrasonic detection sensor 3, so that the light beam of the ultrasonic detection sensor 3 is perpendicular to the top plate 5 and parallel to the scale 6. When in use, the light beam of the ultrasonic detection sensor 3 rebounds when it encounters the top plate 5 to confirm the analog quantity corresponding to the ultrasonic detection sensor 3 when the object to be measured is small and large. The analog quantity corresponding to the ultrasonic detection sensor 3 when the object to be measured is small and large is input into the PLC controller to obtain two readings, which are used to jointly confirm the relationship between the radius and the analog quantity of the object to be measured at any point, and further confirm the roll diameter of the object to be measured at any point. The PLC controller transmits the calculated roll diameter data to the remote monitoring module through signal connection. The operator can view this data information in real time on the remote terminal (such as computer, mobile phone, etc.) through the network connection. No matter where they are, as long as there is network coverage, they can remotely monitor and manage the detection system. This function greatly improves the convenience and flexibility of the production process, making it easier for operators to find potential problems in time and take corresponding measures.

[0019] Example 2 Based on Example 1, the PLC controller is connected to an environmental monitoring module, which is used to monitor the temperature, humidity and electromagnetic field strength of the surrounding environment in real time and transmit the data to the PLC controller. The PLC controller compensates and corrects the measurement results of the ultrasonic displacement sensor 3 according to the environmental data.

[0020] In this embodiment, the PLC controller receives real-time temperature, humidity and electromagnetic field strength data from the environment monitoring module through the communication interface, and simultaneously receives analog data sent by the ultrasonic displacement sensor 3 .

[0021] According to the ultrasonic propagation theory, the propagation speed of ultrasonic waves in the air is related to the temperature. Generally speaking, for every 1°C increase in temperature, the propagation speed of ultrasonic waves increases by about 0.6 m / s.

[0022] The PLC controller calculates the temperature compensation coefficient according to the received temperature data (set as T) using the following formula: ):

[0023] in, It is the theoretical propagation speed of ultrasound at the current temperature T, and it is the propagation speed of ultrasound at the reference temperature (e.g. 20°C). Assume that the ultrasonic propagation speed is linearly related to the temperature. Through this coefficient, when the temperature rises, the ultrasonic propagation speed increases, and the measured distance will be smaller, which needs to be corrected by the compensation coefficient.

[0024] Humidity mainly affects the attenuation of ultrasound. As humidity increases, water molecules in the air absorb and scatter ultrasound, causing the measurement distance to decrease. The PLC calculates the humidity compensation coefficient (H) based on the humidity data (set as H) and the pre-established experimental model. ). For example, an empirical formula is obtained through experiments: ,in, It is a coefficient related to ultrasonic frequency, ambient air pressure and other factors. This coefficient needs to be determined through a large number of experiments during the equipment installation and commissioning phase. Under different coating machine working environments and ultrasonic sensor parameters, The value of may be different.

[0025] The electromagnetic field strength mainly interferes with the electronic components of the ultrasonic displacement sensor (3), affecting the accuracy of the measurement. When the electromagnetic field strength (set as E) increases, the signal output by the sensor may deviate. The PLC controller calculates the electromagnetic field strength compensation coefficient ( ). For example, for a simple linear disturbance model: ,in It is the interference coefficient determined by experiments, which reflects the influence of electromagnetic field strength on the sensor output signal.

[0026] The PLC controller receives the original distance measurement data of the ultrasonic wave (set as ), and then use the compensation coefficient calculated above to correct it. The calculation formula for the corrected distance measurement data (D) is as follows:

[0027] In this way, the combined effects of temperature, humidity and electromagnetic field strength on ultrasonic measurements are taken into account and the raw data are compensated.

[0028] Example 3 On the basis of Example 1, a groove is provided on the inner side wall of the ferrule (7), the scale (6) slides in the groove, a limit spring is fixedly connected to the bottom wall of the ferrule (7), and the scale (6) is connected to the limit spring.

[0029] In this embodiment, when the top plate 5 moves to drive the scale 6 to move along the groove of the clamping sleeve 7, the scale 6 is easy to fall out of the clamping sleeve 7. This problem is avoided by providing a limit spring.

[0030] Example 4 On the basis of Example 1, the bracket 4 is provided with scale markings and a fine-tuning device for quickly and accurately installing the ultrasonic detection sensor 3 .

[0031] In this embodiment, in order to facilitate the operator to quickly read the scale value, the scale is marked with two colors, the main scale line is eye-catching white, there is a red auxiliary scale line every 5 mm, and the corresponding value is marked next to the scale. When installing the ultrasonic displacement sensor (3), the operator can quickly move the sensor to the approximate target position according to these scale markings. Example 5 The present embodiment also discloses an ultrasonic reel diameter detection method, which uses the above-mentioned ultrasonic reel diameter detection system. First, the object to be measured is mounted on a transmission device for unwinding, and its axis, minor diameter and major diameter are determined. Next, the scale 6 is placed in the ferrule 7, and the scale 6 is moved to drive the top plate 5 to determine the point of intersection with the object to be measured. Then, the ferrule 7 is fixed to ensure that the light beam of the ultrasonic detection sensor 3 is parallel to the scale 6 and perpendicular to the top plate 5. The point of intersection of the minor diameter and the top plate is the near point, and the point of intersection of the major diameter and the top plate is the far point. The analog value of the ultrasonic detection sensor 3 at the near point and the far point is confirmed, and the analog value is input into the PLC controller to obtain the readings of the near point and the far point in the PLC. The radius of the object to be measured at any point is confirmed, thereby obtaining the reel diameter.

[0032] The ultrasonic coil diameter detection method in this embodiment is specifically implemented according to the following steps: S1: The object to be measured is mounted on the transmission device for unwinding. The axis of the object to be measured is recorded as O, the minor diameter of the object to be measured is recorded as r, and the major diameter of the object to be measured is recorded as R; S2: Install the scale 6 in the ferrule 7, move the scale 6 to drive the top plate 5 to determine the tangent point between the object to be measured and the top plate 5, and then fix the ferrule 7 on the bracket 4 to ensure that the light beam of the ultrasonic detection sensor 3 is parallel to the scale 6 and perpendicular to the top plate 5; S3: The center of the object to be measured is O, the tangent point between the minor diameter r of the object to be measured and the top plate 5 is A, the tangent point between the major diameter R of the object to be measured and the top plate 5 is B, the intersection of the scale 6 and the ferrule 7 is C, and the position of the ultrasonic detection sensor 3 is D; S4: Take point A as the far point and point B as the near point, confirm the analog value of the ultrasonic detection sensor 3 at the near point and the far point; input the analog value into the PLC controller to obtain the readings of the near point and the far point in the PLC controller; according to the minor diameter r, the major diameter R and the readings of the PLC controller, the radius y and the ultrasonic analog value x of the object to be measured at any point are obtained, and the object to be measured is driven to rotate through the transmission device to detect the winding diameter of the object to be measured at any point.

[0033] S4 is as follows: point A is determined as the far point, and the analog value of the ultrasonic wave corresponding to r corresponds to the reading of 0 in the PLC; point B is determined as the near point, and the analog value of the ultrasonic wave corresponding to R corresponds to the reading of D in the PLC controller. According to the direct proportional function of the two points A (0, r) and B (C, R), the relationship between the radius y and the analog value x at any point is determined as shown in the following formula:

[0034] In the formula, y represents the radius at any point of the measured object, R represents the major diameter of the measured object, r represents the minor diameter of the measured object, x represents the analog value at any point of the measured object, and D represents the analog value of the ultrasound corresponding to R, which corresponds to the reading in the PLC controller.

[0035] In S4, the ultrasonic displacement sensor (3) transmits the measurement data to the PLC controller. When the PLC controller receives the measurement data, it combines the temperature, humidity and electromagnetic field strength data provided by the current environment monitoring module and uses a pre-set compensation algorithm model to dynamically compensate and correct the measurement result of the ultrasonic displacement sensor 3.

[0036] Example 6 In combination with the ultrasonic roll diameter detection system and the corresponding ultrasonic roll diameter detection method disclosed in the above embodiment, this embodiment provides a specific use example: like Figure 1As shown, the measured object is the roll film 1, and the diameter range of the roll film 1 is rR, r is the minimum radius of the roll film 1, and the value is 45mm, and R is the maximum radius of the roll film 1 (unrolled state), and the value is 625mm.

[0037] like Figure 4 As shown, O is the center point of the web film 1, A is the tangent point of the web film 1 at the smallest roll, the minimum radius is r, B is the tangent point of the web film 1 at the largest roll, the radius of the largest roll is R, C is the intersection of the ferrule 7 and the scale 6, and the scale reading at point C represents the length L of OC.

[0038] like Figure 5 As shown, Figure 5 For the electrical control schematic diagram, determine point A as the far point, and use the scale 6 to determine that the reading of point C when the top plate is at point A is x1=Lr. Determine point B as the near point, and use the scale 6 to determine that the reading of point C when the top plate is at point B is x2=LR. The analog value of the ultrasonic wave corresponding to r is 4mA, and the corresponding reading in the PLC is 0; the analog value of the ultrasonic wave corresponding to R is 20mA, and the corresponding reading in the PLC is 27648 (taking Siemens PLC as an example); Specifically, points O, A, and C are all on the ultrasonic luminous line. Fix the card sleeve 7, record the current scale reading x1=Lr at point C, and click "Far Point Confirmation" in the remote monitoring module (i.e., human-machine interface), then KA1 is on, and the ultrasonic analog input is determined to be 4mA; the card does not move and pulls the scale out. When the reading at point C is x2=LR, stop pulling the scale, and click "Near Point Confirmation" in the remote monitoring module (i.e., human-machine interface), then KA2 is on, and the ultrasonic analog input value is 20mA. In this way, the detection range positioning of the roll film 1 from the minimum roll r to the maximum roll R is realized. Then, according to the direct proportional function of the two points A (0, r) and B (27648, R), the relationship between the radius y and the analog x at any point is determined: +L- .

[0039] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0040] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Ultrasonic roll diameter detection system, characterized in that: The invention comprises a detection device and a transmission device; the transmission device is used to drive the object to be detected to rotate; the detection device (2) comprises a scale (6); one end of the scale (6) is fixedly connected to a top plate (5) for positioning and detecting the roll radial section; the top plate (5) is perpendicular to the scale (6); the scale (6) is circumferentially slidably connected to a ferrule (7); the ferrule (7) is slidably connected to the scale (6); the detection device (2) also comprises a bracket (4); an ultrasonic detection sensor (3) is mounted on the bracket (4); the light beam of the ultrasonic detection sensor (3) is perpendicular to the top plate (5); the detection device (2) also comprises a PLC controller; the ultrasonic detection sensor (3) is signal-connected to the PLC controller; the PLC controller is also signal-connected to a remote monitoring module.

2. The ultrasonic roll diameter detection system according to claim 1, characterized in that: The PLC controller is connected to an environmental monitoring module, which is used to monitor the temperature, humidity and electromagnetic field strength of the surrounding environment in real time and transmit the data to the PLC controller. The PLC controller compensates and corrects the measurement results of the ultrasonic displacement sensor (3) based on the environmental data.

3. The ultrasonic roll diameter detection system according to claim 1, characterized in that: A groove is provided on the inner side wall of the ferrule (7), and the scale (6) slides in the groove. A limit spring is fixedly connected to the bottom wall of the ferrule (7), and the scale (6) is connected to the limit spring.

4. The ultrasonic roll diameter detection system according to claim 1, characterized in that: The bracket (4) is provided with scale markings and a fine-tuning device for quickly and accurately installing the ultrasonic detection sensor (3).

5. An ultrasonic roll diameter detection method, using an ultrasonic roll diameter detection system as claimed in any one of claims 1 to 4, characterized in that: First, the object to be measured is mounted on the transmission device and unwound to determine its axis, minor diameter and major diameter. Next, the scale (6) is placed in the ferrule (7), and the scale (6) is moved to drive the top plate (5) to determine the tangent point with the object to be measured. Then, the ferrule (7) is fixed to ensure that the light beam of the ultrasonic detection sensor (3) is parallel to the scale (6) and perpendicular to the top plate (5). The tangent point between the minor diameter and the top plate is the near point, and the tangent point between the major diameter and the top plate is the far point. The analog value of the ultrasonic detection sensor (3) at the near point and the far point is confirmed, and the analog value is input into the PLC controller to obtain the readings of the near point and the far point in the PLC. The radius of the object to be measured at any point is confirmed, thereby obtaining the winding diameter.

6. The ultrasonic coil diameter detection method according to claim 5, characterized in that: Follow the steps below to implement it: S1: The object to be measured is mounted on the transmission device for unwinding. The axis of the object to be measured is recorded as O, the minor diameter of the object to be measured is recorded as r, and the major diameter of the object to be measured is recorded as R; S2: Install the scale (6) in the ferrule (7), move the scale (6) to drive the top plate (5) to determine the point of intersection between the object to be measured and the top plate (5), and then fix the ferrule (7) on the bracket (4) to ensure that the light beam of the ultrasonic detection sensor (3) is parallel to the scale (6) and perpendicular to the top plate (5); S3: The center of the object to be measured is denoted as point O, the tangent point between the minor diameter r of the object to be measured and the top plate (5) is denoted as point A, the tangent point between the major diameter R of the object to be measured and the top plate (5) is denoted as point B, the intersection point between the scale (6) and the ferrule (7) is denoted as point C, and the position of the ultrasonic detection sensor (3) is denoted as point D; S4: With point A as the far point and point B as the near point, confirm the analog value of the ultrasonic detection sensor (3) at the near point and the far point; input the analog value into the PLC controller to obtain the readings of the near point and the far point in the PLC controller; obtain the radius y and the ultrasonic analog value x of the object to be measured at any point based on the minor diameter r, the major diameter R and the readings of the PLC controller, drive the object to be measured to rotate through the transmission device, and detect the winding diameter of the object to be measured at any point.

7. The ultrasonic coil diameter detection method according to claim 5, characterized in that: The S4 is specifically as follows: point A is determined as the far point, and the analog value of the ultrasonic wave corresponding to r corresponds to a reading of 0 in the PLC; point B is determined as the near point, and the analog value of the ultrasonic wave corresponding to R corresponds to a reading of D in the PLC controller. According to the direct proportional function of the two points A (0, r) and B (C, R), the relationship between the radius y and the analog value x at any point is determined as shown in the following formula: In the formula, y represents the radius at any point of the measured object, R represents the major diameter of the measured object, r represents the minor diameter of the measured object, x represents the analog value at any point of the measured object, and D represents the analog value of the ultrasound corresponding to R, which corresponds to the reading in the PLC controller.

8. The ultrasonic coil diameter detection method according to claim 5, characterized in that: In S4, the ultrasonic displacement sensor (3) transmits the measurement data to the PLC controller. When the PLC controller receives the measurement data, it combines the temperature, humidity and electromagnetic field strength data provided by the current environment monitoring module and uses a pre-set compensation algorithm model to dynamically compensate and correct the measurement result of the ultrasonic displacement sensor (3).

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