Method, equipment and system for measuring thickness of inner wall coating of material processing equipment

Abstract

The invention discloses a method, equipment and system for measuring the thickness of an inner wall coating of material processing equipment, and relates to the technical field of ultrasonic measurement. According to the method, an ultrasonic sensor located on the outer wall of the material processing equipment is controlled to emit an ultrasonic signal, a target signal is received through the ultrasonic sensor, and the target signal comprises a first echo signal formed through reflection of an interface of a coating and a material in the material processing equipment and a second echo signal formed through reflection of the material. According to the method, based on a target signal and an ultrasonic signal, the first transmission duration of the ultrasonic signal reaching a first interface is determined, and then the thickness of the coating is determined based on the first transmission duration and the first transmission speed of the ultrasonic signal in the coating. The thickness of the coating on the inner wall of the material treatment equipment can be measured outside the material treatment equipment, so that the material treatment equipment does not need to be disassembled, iron metal foreign matters cannot be introduced into the material, and the influence of the coating thickness measurement process on the purity of the material can be avoided.

Description

Technical Field

[0001] The present application relates to the field of ultrasonic measurement technology, and in particular to a thickness measurement method, thickness measurement equipment, and system for an inner wall coating of a material processing equipment. Background Art

[0002] During the processing and production of cathode materials, non-metallic coatings / non-ferrous wear-resistant coatings are usually added to the inner walls of stainless steel material handling equipment (such as silos, pipelines, or vibrating screens) that store, transport, and screen cathode materials to prevent ferrous foreign matter from mixing into the cathode materials. However, after the cathode materials rub in the material handling equipment for a certain period of time, the coating may be lost due to wear. If the missing coating is not discovered and repaired in time, metallic foreign matter may mix into the cathode materials. Therefore, regular inspection and maintenance of the integrity of the coating on the inner walls of material handling equipment is crucial to ensuring the yield of cathode materials.

[0003] In related technologies, a magnetic induction thickness gauge is typically used to regularly measure the coating thickness. If the coating thickness is detected to be substandard, the coating is promptly repaired. However, this thickness gauge requires direct contact with the coating of the equipment during testing. If the coating is located on the inner wall of the equipment, the material handling equipment must be disassembled or entered into the equipment. This may result in the introduction of ferrous metal foreign matter into the positive electrode material, affecting the purity of the positive electrode material. Summary of the Invention

[0004] This application provides a method, device, and system for measuring the thickness of the inner wall coating of material handling equipment. This method aims to, at least to a certain extent, address the technical problem in related technologies where, during the coating thickness measurement process, foreign iron metal matter may be introduced into the positive electrode material, thereby affecting the purity of the positive electrode material. The technical solution is as follows:

[0005] In one aspect, a method for measuring the thickness of a coating on an inner wall of a material processing device is provided, wherein the method is applied to a thickness measuring device connected to an ultrasonic sensor located on an outer wall of the material processing device; the method comprises:

[0006] controlling the ultrasonic sensor to transmit an ultrasonic signal and receiving a target signal through the ultrasonic sensor, the target signal including: a first echo signal and a second echo signal, the first echo signal being formed by the ultrasonic signal being reflected from a first interface, the first interface being an interface between the coating and a material in the material processing equipment, and the second echo signal being formed by the ultrasonic signal being reflected from the material;

[0007] determining a first transmission time for the ultrasonic signal to reach the first interface based on the ultrasonic signal emitted by the ultrasonic sensor and the target signal;

[0008] The thickness of the coating is determined based on the first transmission duration and a first transmission speed of the ultrasonic signal in the coating, where the thickness is positively correlated with both the first transmission duration and the first transmission speed.

[0009] Optionally, a coupling layer is filled between the ultrasonic sensor and the outer wall of the material processing equipment; and determining the thickness of the coating based on the first transmission duration and a first transmission speed of the ultrasonic signal in the coating includes:

[0010] Determining a fourth transmission duration of the ultrasonic signal in the coating layer based on the first transmission duration, the second transmission duration of the ultrasonic signal in the coupling layer, and the third transmission duration of the ultrasonic signal in the material processing equipment, wherein the fourth transmission duration is proportional to a difference obtained by subtracting the second transmission duration and the third transmission duration from the first transmission duration;

[0011] The thickness of the coating is determined based on the fourth transmission time and a first transmission speed of the ultrasonic signal in the coating. The thickness is proportional to a product of the fourth transmission time and the first transmission speed.

[0012] Optionally, before determining a fourth transmission duration of the ultrasonic signal in the coating layer based on the first transmission duration, the second transmission duration of the ultrasonic signal in the coupling layer, and the third transmission duration of the ultrasonic signal in the material processing equipment, the method further includes:

[0013] determining a second transmission duration of the ultrasonic signal in the coupling layer based on a second transmission speed of the ultrasonic signal in the coupling layer and a thickness of the coupling layer;

[0014] Based on the third transmission speed of the ultrasonic wave in the material processing equipment and the thickness of the material processing equipment, a third transmission time duration of the ultrasonic signal in the material processing equipment is determined. Thus, in the case where a coupling layer is filled between the ultrasonic sensor and the outer wall of the material processing equipment, the thickness measurement method of the coating on the inner wall of the material processing equipment provided in this application may include:

[0015] Controlling the ultrasonic sensor to transmit an ultrasonic signal and receiving a target signal through the ultrasonic sensor, the target signal including: a first echo signal and a second echo signal, the first echo signal being formed by the ultrasonic signal being reflected from a first interface, the first interface being an interface between the coating and a material in the material processing equipment, and the second echo signal being formed by the ultrasonic signal being reflected from the material;

[0016] determining a first transmission time for the ultrasonic signal to reach the first interface based on the ultrasonic signal emitted by the ultrasonic sensor and the target signal;

[0017] determining a fourth transmission duration of the ultrasonic signal in the coating layer based on the first transmission duration, the second transmission duration of the ultrasonic signal in the coupling layer, and the third transmission duration of the ultrasonic signal in the material processing equipment;

[0018] determining a thickness of the coating based on the fourth transmission duration and a first transmission speed of the ultrasonic signal in the coating, wherein the thickness is proportional to a product of the fourth transmission duration and the first transmission speed;

[0019] The fourth transmission duration is proportional to the difference between the first transmission duration and the second transmission duration and the third transmission duration, the second transmission duration is determined by the second transmission speed of the ultrasonic signal in the coupling layer and the thickness of the coupling layer, and the third transmission duration is determined by the third transmission speed of the ultrasonic signal in the material processing equipment and the thickness of the material processing equipment.

[0020] Optionally, determining a first transmission time for the ultrasonic signal to reach the first interface based on the ultrasonic signal emitted by the ultrasonic sensor and the target signal includes:

[0021] determining a cross-correlation function between the ultrasonic signal emitted by the ultrasonic sensor and the target signal;

[0022] Based on the time delay corresponding to the maximum peak of the cross-correlation function, a first transmission time for the ultrasonic signal to reach the first interface is determined, where the first transmission time is positively correlated with the time delay. That is, the thickness measurement device can use a correlation analysis method to determine the first transmission time for the ultrasonic signal emitted by the ultrasonic sensor to reach the first interface.

[0023] Optionally, before determining the first transmission duration of the ultrasonic signal reaching the first interface based on the time delay corresponding to the maximum peak of the cross-correlation function, the method further includes:

[0024] Obtaining all extreme points of the cross-correlation function;

[0025] From all the extreme value points, obtain an extreme value point whose function value is greater than a target threshold;

[0026] Based on an extreme point where the function value is greater than the target threshold, a maximum peak value of the cross-correlation function is obtained.

[0027] It can be seen that the method provided in the embodiment of the present application may include:

[0028] controlling the ultrasonic sensor to transmit an ultrasonic signal and receiving a target signal through the ultrasonic sensor, the target signal including: a first echo signal and a second echo signal, the first echo signal being formed by reflection from a first interface between the coating and a material in the material processing equipment, and the second echo signal being formed by reflection from the ultrasonic signal from the material;

[0029] Obtaining all extreme points of the cross-correlation function between the ultrasonic signal emitted by the ultrasonic sensor and the target signal;

[0030] From all the extreme value points, obtain an extreme value point whose function value is greater than a target threshold;

[0031] Obtaining a maximum peak value of the cross-correlation function based on an extreme point where the function value is greater than the target threshold;

[0032] Determining a first transmission time duration of the ultrasonic signal reaching the first interface based on the time delay corresponding to the maximum peak, where the first transmission time duration is positively correlated with the time delay;

[0033] Determining a fourth transmission duration of the ultrasonic signal in the coating layer based on the first transmission duration, the second transmission duration of the ultrasonic signal in the coupling layer, and the third transmission duration of the ultrasonic signal in the material processing equipment, wherein the fourth transmission duration is proportional to a difference obtained by subtracting the second transmission duration and the third transmission duration from the first transmission duration;

[0034] The thickness of the coating is determined based on the fourth transmission time and a first transmission speed of the ultrasonic signal in the coating. The thickness is proportional to a product of the fourth transmission time and the first transmission speed.

[0035] Optionally, a coupling layer is filled between the ultrasonic sensor and the outer wall of the material processing equipment; and receiving the first echo signal through the ultrasonic sensor includes:

[0036] receiving a mixed signal through the ultrasonic sensor, the mixed signal including: the target signal, a third echo signal, a fourth echo signal, and a noise signal, the third echo signal being formed by the ultrasonic signal emitted by the ultrasonic sensor being reflected from a second interface, the second interface being the interface between the coupling layer and the material processing equipment, the fourth echo signal being formed by the ultrasonic signal emitted by the ultrasonic sensor being reflected from a third interface, the third interface being the interface between the material processing equipment and the coating;

[0037] The interference signal is removed from the mixed signal to obtain the target signal, where the interference signal includes: the third echo signal, the fourth echo signal, and the noise signal.

[0038] Optionally, removing the interference signal from the mixed signal to obtain the target signal includes:

[0039] Eliminating the noise signal from the mixed signal;

[0040] The third echo signal and the fourth echo signal are removed from the mixed signal after the noise signal is removed to obtain a target signal.

[0041] It can be seen that the method for measuring the thickness of the inner wall coating of material handling equipment provided in this application may include:

[0042] controlling the ultrasonic sensor to transmit an ultrasonic signal and receiving a mixed signal through the ultrasonic sensor, the mixed signal including: a first echo signal formed by reflection from a first interface between the coating and a material in the material processing equipment, a second echo signal formed by reflection from the material, a third echo signal formed by reflection from a second interface between the coupling layer and the material processing equipment, a fourth echo signal formed by reflection from a third interface between the material processing equipment and the coating, and a noise signal;

[0043] removing the noise signal from the mixed signal, and removing the third echo signal and the fourth echo signal from the mixed signal after the noise signal is removed, to obtain a target signal;

[0044] determining a cross-correlation function between the ultrasonic signal emitted by the ultrasonic sensor and the target signal;

[0045] determining, based on a time delay corresponding to a maximum peak of the cross-correlation function, a first transmission time duration for the ultrasonic signal to reach the first interface, wherein the first transmission time duration is positively correlated with the time delay;

[0046] Determining a fourth transmission duration of the ultrasonic signal in the coating layer based on the first transmission duration, the second transmission duration of the ultrasonic signal in the coupling layer, and the third transmission duration of the ultrasonic signal in the material processing equipment, wherein the fourth transmission duration is proportional to a difference obtained by subtracting the second transmission duration and the third transmission duration from the first transmission duration;

[0047] The thickness of the coating is determined based on the fourth transmission time and a first transmission speed of the ultrasonic signal in the coating. The thickness is proportional to a product of the fourth transmission time and the first transmission speed.

[0048] Optionally, removing the noise signal from the mixed signal includes:

[0049] Converting the mixed signal from the time domain to the frequency domain to obtain the mixed signal in the frequency domain, wherein the mixed signal in the frequency domain includes a plurality of different frequency components;

[0050] Calculating the correlation value between each of the frequency components and the ultrasonic signal;

[0051] The frequency components whose correlation values ​​are lower than a correlation threshold are removed from the mixed signal in the frequency domain, so as to remove the noise signal from the mixed signal.

[0052] In another aspect, a device for measuring the thickness of a coating on an inner wall of a material processing device is provided, which is applied to the thickness measuring device and is connected to an ultrasonic sensor located on an outer wall of the material processing device. The device comprises:

[0053] a control module, configured to control the ultrasonic sensor to transmit an ultrasonic signal and receive a target signal through the ultrasonic sensor, the target signal comprising: a first echo signal and a second echo signal, the first echo signal being formed by the ultrasonic signal being reflected from a first interface, the first interface being an interface between the coating and a material in the material processing equipment, and the second echo signal being formed by the ultrasonic signal being reflected from the material;

[0054] a first determining module, configured to determine a first transmission time for the ultrasonic signal to reach the first interface based on the ultrasonic signal emitted by the ultrasonic sensor and a target signal;

[0055] The second determination module is used to determine the thickness of the coating based on the first transmission duration and a first transmission speed of the ultrasonic signal in the coating, where the thickness is positively correlated with both the first transmission duration and the first transmission speed.

[0056] On the other hand, a thickness measuring device is provided, which includes: a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, the thickness measurement method of the inner wall coating of the material processing equipment as described in the above aspects is implemented.

[0057] On the other hand, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method for measuring the thickness of the inner wall coating of material processing equipment as described in the above aspects is implemented.

[0058] On the other hand, a computer program product is provided, which includes a computer program or computer instructions, and when the computer program or the computer instructions are executed by a processor, the method for measuring the thickness of the inner wall coating of the material processing equipment as described in the above aspects is implemented.

[0059] In another aspect, a thickness measurement system is provided, comprising: an ultrasonic sensor, a material processing device, and the thickness measurement device described in the above aspect;

[0060] Wherein, the ultrasonic sensor is arranged on the outer wall of the material processing equipment and is connected to the thickness measuring equipment.

[0061] Optionally, an absorption layer is provided at one end of the ultrasonic sensor away from the material processing equipment.

[0062] Optionally, the material processing equipment is selected from a vibrating screen, and the ultrasonic sensor is disposed at a first position on the bottom frame of the vibrating screen, with the first position being located at a distance from the central axis of the vibrating screen of 1 / 3 to 1 / 2 of the radius of the vibrating screen. Extensive experimental research by the applicant has revealed that, in the field of lithium battery positive electrode materials, the average service life of the coating at the first position is approximately six months. Placing an ultrasonic sensor at this position is more conducive to assisting in determining thickness changes of the inner wall coating.

[0063] The beneficial effects of the technical solution provided by this application include at least:

[0064] The present application provides a method, device, and system for measuring the thickness of the coating on the inner wall of material processing equipment. The method can control an ultrasonic sensor located on the outer wall of the material processing equipment to transmit an ultrasonic signal and receive a target signal through the ultrasonic sensor. The target signal includes a first echo signal formed by reflection from the interface between the coating and the material in the material processing equipment, and a second echo signal formed by reflection from the material. Subsequently, the method can determine a first transmission time for the ultrasonic signal to reach the first interface based on the target signal and the ultrasonic signal, and then determine the thickness of the coating based on the first transmission time and the first transmission speed of the ultrasonic signal in the coating. Since the thickness of the coating on the inner wall of the material processing equipment can be measured outside the material processing equipment, there is no need to manually disassemble the material processing equipment. On the one hand, iron and metal foreign matter will not be introduced into the material, thereby preventing the coating thickness measurement process from affecting the purity of the material. On the other hand, the material processing equipment does not need to be stopped during the thickness measurement process. That is, the coating thickness can be measured while the material processing equipment is in operation, reducing the impact on the operation of the material processing equipment. Moreover, since there is no need to manually use a thickness gauge for measurement, on the one hand, automated monitoring of the coating thickness is achieved, and on the other hand, manual operation can be simplified, reducing labor costs. In addition, the method provided in the embodiment of the present application can obtain the coating thickness at any time. On the one hand, the missing coating can be discovered in time. On the other hand, the coating can be repaired when the thickness is low enough to introduce ferrous metal substances into the material, thereby improving the utilization rate of the coating.

[0065] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 This is a schematic structural diagram of a thickness measurement system provided in an embodiment of the present application;

[0067] Figure 2 is a schematic diagram of the installation position of an ultrasonic sensor provided in an embodiment of the present application;

[0068] Figure 3 This is a partial structural diagram of a thickness measurement system provided in an embodiment of the present application;

[0069] Figure 4 This is a schematic diagram of an ultrasonic sensor provided in an embodiment of the present application disposed on the outer wall of a material processing device;

[0070] Figure 5 This is a flow chart of a method for measuring the thickness of an inner wall coating of a material handling equipment provided in an embodiment of the present application;

[0071] Figure 6This is a flow chart of another method for measuring the thickness of the inner wall coating of material processing equipment provided in an embodiment of the present application;

[0072] Figure 7 This is a flowchart of a method for determining a first transmission duration provided by an embodiment of the present application;

[0073] Figure 8 Schematic diagram of a device for measuring the thickness of an inner wall coating of a material processing equipment provided in an embodiment of the present application;

[0074] Figure 9 This is a schematic diagram of another device for measuring the thickness of the inner wall coating of material processing equipment provided in an embodiment of the present application. DETAILED DESCRIPTION

[0075] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0076] During the processing and production of cathode materials, non-metallic coatings / non-ferrous wear-resistant coatings are typically added to the inner walls of stainless steel material handling equipment (such as silos or pipelines) that store and transport cathode materials to prevent the incorporation of ferrous foreign matter into the cathode materials. However, after the cathode materials rub against each other in the material handling equipment for a certain period of time, the coating may be lost due to wear. If the missing coating is not discovered and repaired in a timely manner, ferrous foreign matter may be mixed into the cathode materials. Therefore, regular inspection and maintenance of the integrity of the coating on the inner walls of material handling equipment is crucial to ensuring the purity of the cathode materials.

[0077] In the related art, it is usually necessary to manually disassemble the material handling equipment regularly and use a handheld magnetic induction thickness gauge to contact the coating on the inner wall of the material handling equipment to measure the thickness of the coating; and determine whether the coating needs to be repaired based on the thickness of the coating.

[0078] However, since the material handling equipment needs to be manually disassembled during measurement, on the one hand, it may cause iron metal foreign matter to be introduced into the positive electrode material, affecting the purity of the positive electrode material; on the other hand, the material handling equipment needs to be shut down, affecting the production process; on the other hand, since the material handling equipment needs to be manually disassembled and manually measured, the labor cost required is relatively high. In addition, according to the method of periodically disassembling the material handling equipment according to the actual situation in accordance with the detection cycle to measure the thickness, it may happen that the coating has suffered more significant wear and tear within the time interval between two adjacent detections, that is, this method may not be able to detect the missing condition of the coating in time. In addition, this method usually repairs the coating when it is determined that the thickness of the coating is less than the target thickness, resulting in a low utilization rate of the coating. The target thickness is the minimum empirical thickness, usually an empirical value. In this application, the empirical value is the minimum thickness that ensures that the material handling equipment does not wear and tear within a detection cycle.

[0079] In view of this, an embodiment of the present application provides a method for measuring the thickness of the coating on the inner wall of a material processing device. The method can control an ultrasonic sensor located on the outer wall of the material processing device to transmit an ultrasonic signal and receive a target signal through the ultrasonic sensor. The target signal includes a first echo signal formed by reflection from the interface between the coating and the material in the material processing device, and a second echo signal formed by reflection from the material. Subsequently, the method can determine a first transmission time for the ultrasonic signal to reach the first interface based on the target signal and the ultrasonic signal, and then determine the thickness of the coating based on the first transmission time and the first transmission speed of the ultrasonic signal in the coating. Since the thickness of the coating on the inner wall of the material processing device can be measured outside the material processing device, there is no need to manually disassemble the material processing device. On the one hand, iron and metal foreign matter will not be introduced into the material, thereby avoiding the coating thickness measurement process from affecting the purity of the material; on the other hand, the material processing device does not need to be stopped during the thickness measurement process, that is, the coating thickness can be measured during the operation of the material processing device, reducing the impact on the operation of the material processing device. Moreover, since there is no need to manually use a thickness gauge for measurement, on the one hand, automatic monitoring of the coating thickness is achieved, and on the other hand, manual operation can be simplified and labor costs can be reduced. In addition, the method provided in the embodiment of the present application can obtain the coating thickness at any time. On the one hand, the missing coating can be discovered in time. On the other hand, the coating can be repaired when the thickness is low enough to introduce ferrous metal substances into the material, thereby improving the utilization rate of the coating.

[0080] Figure 1 This is a schematic diagram of the structure of a thickness measurement system provided in an embodiment of the present application. Figure 1The thickness measurement system includes: an ultrasonic sensor 100, a material processing device 200, and a thickness measuring device 300, wherein the ultrasonic sensor 100 is arranged on the outer wall of the material processing device 200 and is connected to the thickness measuring device 300, such as through a wire (such as a shielded wire).

[0081] Optional, please continue to see Figure 1 The thickness measurement system may further include a slave computer 400 connected to the thickness measurement device 300. Under the control of the slave computer 400, the thickness measurement device 300 may control the ultrasonic sensor 100 located on the outer wall of the material processing equipment 200 to emit an ultrasonic signal to detect the thickness of the coating on the inner wall of the material processing equipment 200, and may send the detected thickness to the slave computer 400. The slave computer 400 may then feed back the thickness to a host computer connected to the slave computer 400.

[0082] Optionally, the lower computer 400 may be a programmable logic controller (PLC). The material handling equipment 200 may be a pipeline for transporting materials, a silo for storing materials, or a vibrating screening device for processing materials. The material handling equipment 200 may be made of metal, such as stainless steel.

[0083] It is understood that the ultrasonic sensor 100 can be installed at a target location on the outer wall of the material processing equipment 200. The coating at this target location is more susceptible to wear and typically experiences the greatest wear, reflecting the wear of the coating on the inner wall of the material processing equipment 200. For example, the target location may be the bottom of the material processing equipment 200, and the material flow at the target location is greater than a flow threshold. In other words, the ultrasonic sensor 100 can be installed at the bottom, where the material flow is greater.

[0084] Since the coating at the bottom of the material handling equipment where the material flow is large is usually the area most severely affected by factors such as friction, its thickness change can directly reflect the wear of the coating on the inner wall of the material handling equipment during actual use. Therefore, an ultrasonic sensor is set at this target position to measure the thickness of the coating at the target position, which can accurately evaluate the overall wear degree of the coating on the inner wall of the material handling equipment.

[0085] Alternatively, assuming that the material processing equipment 200 is selected from a vibrating screen, then Figure 2As shown, the ultrasonic sensor 100 can be installed at a first position on the bottom frame of the vibrating screen 200. The distance from the center axis Z of the vibrating screen to this first position is 1 / 3-1 / 2 of the vibrating screen's radius. Based on the applicant's extensive experimental research, in the field of lithium battery positive electrode materials, the average service life of the coating at the first position is approximately 6 months. Placing an ultrasonic sensor at this position is more conducive to assisting in determining changes in the thickness of the inner wall coating.

[0086] Figure 3 This is a partial structural diagram of a thickness measurement system provided in an embodiment of the present application. Figure 3 It can be seen that the ultrasonic sensor 100 may include: a probe 101 , a generator 102 , a receiver 103 and an amplifier circuit 104 . The thickness measuring device 300 includes: a processor 301 and a data acquisition module 302 connected to the processor 301 .

[0087] The first end of the generator 102 is connected to the probe 101, and the second end of the generator 102 is used to connect to the processor 301. The processor 301 is also connected to the slave computer 400. The first end of the receiver 103 is connected to the probe 101, and the second end of the receiver 103 is connected to the first end of the amplifier circuit 104. The second end of the amplifier circuit 104 is used to connect to the data acquisition module 302.

[0088] Optionally, the probe 101 can be a vertical probe or an oblique probe. Furthermore, the probe 101 can be a dual-crystal probe. Compared to a single-crystal probe, a dual-crystal probe has higher transmission and reception sensitivities. This ensures a high degree of thickness accuracy. Furthermore, the probe 101 is typically made of piezoelectric ceramic material. The processor 301 can be a central processing unit (CPU).

[0089] Optional, see Figure 4 A coupling layer A1 is filled between the ultrasonic sensor 100 and the outer wall of the material processing equipment 200. The coupling layer A1 can be made of epoxy resin or rubber. The thickness of the coupling layer A1 can be positively correlated with the wavelength of the ultrasonic wave.

[0090] It is understandable that if the coupling layer A1 is not filled, the ultrasonic waves emitted by the ultrasonic sensor 100 need to pass through the air before reaching the material processing equipment 200. However, the transmission speed of ultrasonic waves in the air is significantly different from the transmission speed in the material processing equipment 200. When the transmission speed difference is large, the ultrasonic waves will be totally reflected at the interface between the two media, affecting the detection accuracy of the ultrasonic sensor 100. Therefore, the coupling layer A1 is filled between the ultrasonic sensor 100 and the outer wall of the material processing equipment 200. The transmission speed of ultrasonic waves in this coupling layer A1 is greater than the transmission speed in the air, which reduces the difference in transmission speed with the material processing equipment. In this way, total reflection of ultrasonic waves can be avoided, thereby improving the detection accuracy of coating thickness.

[0091] Figure 4 A2 in the figure is the coating on the inner wall of the material handling equipment. Figure 4 The ultrasonic sensor 100 may be further provided with an absorption layer A3 at one end thereof away from the material processing equipment 200. The absorption layer A3 may be made of resin, for example, epoxy resin.

[0092] When the ultrasonic sensor 100 probe needs to stop vibrating, it often cannot do so immediately due to factors such as mechanical inertia, resulting in excess vibration, known as aftervibration. This excess vibration can affect echo signal detection. The absorption layer A3 absorbs and eliminates this excess vibration, thereby reducing the interference of aftervibration on thickness measurement and improving coating thickness detection accuracy.

[0093] The embodiment of the present application provides a method for measuring the thickness of the coating on the inner wall of a material processing device, which is applied to a thickness measuring device. The thickness measuring device is connected to an ultrasonic sensor located on the outer wall of the material processing device. For example, the thickness measuring device can be Figures 1 to 3 The thickness measuring device 300 in the thickness measuring system is shown. Figure 5 , the method comprising:

[0094] Step 110: Control the ultrasonic sensor to transmit an ultrasonic signal, and receive a target signal through the ultrasonic sensor.

[0095] To measure the thickness of the coating on the inner wall of material handling equipment, the thickness measuring device can control an ultrasonic sensor to emit an ultrasonic signal. This ultrasonic signal is reflected upon reaching a first interface between the coating on the inner wall of the material handling equipment and the material within the equipment. The ultrasonic signal is also reflected upon contact with the material within the equipment. Accordingly, the thickness measuring device can receive a target signal via the ultrasonic sensor. This target signal includes a first echo signal generated by emission from the first interface and a second echo signal generated by reflection from the material.

[0096] Step 120: Determine a first transmission time for the ultrasonic signal to reach the first interface based on the ultrasonic signal emitted by the ultrasonic sensor and the target signal.

[0097] The thickness measuring device can determine a cross-correlation function between the ultrasonic signal emitted by the ultrasonic sensor and the target signal, and based on the time delay corresponding to the maximum peak of the cross-correlation function, determine a first transmission time of the ultrasonic signal from emission to arrival at the first interface. The first transmission time is proportional to half of the time delay. For example, the first transmission time is half of the time delay.

[0098] Step 130: Determine the thickness of the coating based on the first transmission duration and the first transmission speed of the ultrasonic signal in the coating.

[0099] The thickness of the coating is positively correlated with both the first transmission time and the first transmission speed.

[0100] In one optional implementation, after obtaining the first transmission duration, the thickness measuring device can determine a fourth transmission duration of the ultrasonic signal in the coating based on the first transmission duration. The fourth transmission duration is positively correlated with the first transmission duration. The thickness measuring device can then determine the thickness of the coating based on the fourth transmission duration of the ultrasonic signal in the coating and the first transmission speed of the ultrasonic signal in the coating. The thickness is proportional to the product of the first transmission duration and the first transmission speed.

[0101] In another optional implementation, the thickness measuring device pre-stores a thickness determination model, and the thickness measuring device can input the first transmission duration and the first transmission speed into the thickness determination model to obtain the coating thickness output by the thickness determination model.

[0102] Before inputting the first transmission duration and the first transmission speed into the thickness determination model, the thickness measurement device may acquire multiple training data. Each training data set includes: the sample transmission duration from the time the ultrasonic signal is emitted to the time it reaches the first interface, the first transmission speed, and the sample coating thickness. The thickness measurement device may then perform model training using the multiple training data sets to obtain a thickness determination model.

[0103] In summary, the embodiment of the present application provides a method for measuring the thickness of the inner wall coating of a material processing equipment. The method can control an ultrasonic sensor located on the outer wall of the material processing equipment to transmit an ultrasonic signal and receive a target signal through the ultrasonic sensor. The target signal includes a first echo signal formed by reflection at the interface between the coating and the material in the material processing equipment, and a second echo signal formed by reflection of the material. Subsequently, the method can determine the first transmission time for the ultrasonic signal to reach the first interface based on the target signal and the ultrasonic signal, and then determine the thickness of the coating based on the first transmission time and the first transmission speed of the ultrasonic signal in the coating. Since the thickness of the inner wall coating of the material processing equipment can be measured outside the material processing equipment, there is no need to manually disassemble the material processing equipment. On the one hand, iron and metal foreign matter will not be introduced into the material, thereby avoiding the coating thickness measurement process from affecting the purity of the material; on the other hand, the material processing equipment does not need to be stopped during the thickness measurement process, that is, the coating thickness can be measured during the operation of the material processing equipment, reducing the impact on the operation of the material processing equipment. Moreover, since there is no need to manually use a thickness gauge for measurement, on the one hand, automatic monitoring of the coating thickness is achieved, and on the other hand, manual operation can be simplified and labor costs can be reduced. In addition, the method provided in the embodiment of the present application can obtain the coating thickness at any time. On the one hand, the missing coating can be discovered in time. On the other hand, the coating can be repaired when the thickness is low enough to introduce ferrous metal substances into the material, thereby improving the utilization rate of the coating.

[0104] The embodiment of the present application takes the case where a coupling layer is filled between the ultrasonic sensor and the outer wall of the material processing equipment as an example to illustrate the thickness measurement method of the inner wall coating of the material processing equipment provided by the embodiment of the present application. The method is applied to thickness measuring equipment, such as Figures 1 to 3 The thickness measuring equipment shown. Figure 6 As shown, the method may include:

[0105] Step 201: Control the ultrasonic sensor to transmit an ultrasonic signal.

[0106] Once the ultrasonic sensor is installed, the thickness measurement device can control it to emit ultrasonic signals. Specifically, upon receiving a coating thickness measurement request from the lower computer, the thickness measurement device's processor sends a synchronization signal to the ultrasonic sensor. This synchronization signal then stimulates the ultrasonic sensor's generator to generate and emit ultrasonic signals.

[0107] Step 202: Receive a mixed signal through an ultrasonic sensor.

[0108] The ultrasonic signal emitted by the ultrasonic sensor will sequentially pass through the coupling layer, the material handling equipment, and the coating on the inner wall of the material handling equipment, thereby coming into contact with the material inside the material handling equipment. When the ultrasonic wave encounters the interface where two materials with different acoustic impedances meet, it will be transmitted and reflected. The ultrasonic signal will also be reflected after encountering the material. And during the process of measuring the coating thickness, the material handling equipment can continue to operate. Therefore, the thickness measuring equipment can receive a mixed signal through the ultrasonic sensor. This mixed signal includes the echo signal reflected by the interface of different media, the echo signal emitted by the material (i.e., the second echo signal mentioned above), and the noise signal. The noise signal refers to the sound signal generated by material flow, adhesion, equipment operation, etc.

[0109] The echo signals emitted by the interface between the different media include: a first echo signal, a third echo signal, and a fourth echo signal. The first echo signal is formed by the ultrasonic signal reflecting off the first interface. The first interface is the interface between the coating on the inner wall of the material processing equipment and the material in the material processing equipment. The third echo signal is formed by the ultrasonic signal emitted by the ultrasonic sensor reflecting off the second interface, which is the interface between the coupling layer and the material processing equipment. The fourth echo signal is formed by the ultrasonic signal emitted by the ultrasonic sensor reflecting off the third interface, which is the interface between the material processing equipment and the coating. In other words, the mixed signal includes: the first echo signal, the second echo signal, the third echo signal, the fourth echo signal, and a noise signal.

[0110] In the embodiment of the present application, the receiver of the ultrasonic sensor can receive the mixed signal under the influence of the synchronization signal sent by the thickness measuring device and send it to the amplifier circuit. The amplifier circuit can amplify the mixed signal and feed it back to the thickness measuring device. In turn, the thickness measuring device can receive the amplified mixed signal.

[0111] Step 203: Eliminate the interference signal from the mixed signal to obtain the target signal.

[0112] Noise signals can affect the accuracy of coating thickness detection, and the third and fourth echo signals can interfere with the process of determining the first transmission time of the ultrasonic signal from emission to reaching the first interface between the coating and the material. Therefore, after the thickness measurement device obtains a mixed signal, it can remove the interference signal from the mixed signal to obtain the target signal, based on which the first transmission time is determined. This ensures high coating thickness detection accuracy.

[0113] The interference signal includes: a third echo signal, a fourth echo signal and a noise signal. Correspondingly, the obtained target signal includes: a first echo signal formed by reflection from the first interface and a second echo signal formed by reflection from the material.

[0114] In the embodiment of the present application, the thickness measuring device may first remove the noise signal from the mixed signal, and then remove the third echo signal and the fourth echo signal from the mixed signal after the noise signal is removed to obtain the target signal.

[0115] Alternatively, the thickness measuring device may first remove the third echo signal and the fourth echo signal from the mixed signal, and then remove the noise signal from the mixed signal after the third echo signal and the fourth echo signal are removed, so as to obtain the target signal.

[0116] In an embodiment of the present application, since the frequency of an ultrasonic signal generally does not change after reflection, and the frequency of an ultrasonic signal is generally different from the frequency of a noise signal, the thickness measuring device may first employ a time-frequency analysis method to convert the mixed signal from the time domain to the frequency domain to obtain a mixed signal in the frequency domain. The mixed signal in the frequency domain includes a plurality of different frequency components. The thickness measuring device may then remove the frequency components having a frequency different from that of the ultrasonic signal from the mixed signal in the frequency domain to remove the noise signal from the mixed signal. Specifically, the thickness measuring device may compare the similarities and differences between the frequencies of each frequency component and the frequency of the ultrasonic signal to identify and remove the frequency components having a frequency different from that of the ultrasonic signal.

[0117] It is understandable that the thickness measuring device may perform fast Fourier transformation (FFT) on the mixed signal in the time domain to transform the mixed signal in the time domain into the frequency domain.

[0118] In an embodiment of the present application, the thickness of the coupling layer, the thickness of the material processing equipment, the transmission speed of the ultrasonic signal in the coupling layer, and the transmission speed of the ultrasonic signal in the material processing equipment are all known values. Therefore, the thickness measuring device can remove the third echo signal and the fourth echo signal from the mixed signal through a time domain signal method.

[0119] Specifically, the thickness measurement device can determine the reception time of a third echo signal formed by reflection from the second interface between the coupling layer and the material processing equipment based on the thickness of the coupling layer and the transmission speed of ultrasound in the coupling layer. Furthermore, the thickness measurement device can determine the reception time of a fourth echo signal formed by reflection from the third interface between the material processing equipment and the coating based on the thickness of the material processing equipment and the transmission speed of ultrasound in the material processing equipment. The thickness measurement device can then set a "gate" function in the time domain based on the reception times of the third and fourth echo signals, allowing only signals later than the reception times of the third and fourth echo signals to pass through, thereby removing the third and fourth echo signals from the mixed signal.

[0120] It is understandable that the thickness measuring device can remove the interference signal from the mixed signal and then transform the mixed signal after the interference signal is removed from the frequency domain to the time domain to restore the mixed signal after the interference signal is removed to the time domain.

[0121] Step 204: Based on the ultrasonic signal emitted by the ultrasonic sensor and the target signal, determine a first transmission time for the ultrasonic signal to reach the first interface.

[0122] The thickness measuring device can determine the cross-correlation function between the ultrasonic signal emitted by the ultrasonic sensor and the target signal, and determine the first transmission time length of the ultrasonic signal to reach the first interface based on the time delay corresponding to the maximum peak of the cross-correlation function.

[0123] The first transmission duration is proportional to half the time delay. For example, the first transmission duration is half the time delay, or the first transmission duration is the product of half the time delay and a preset coefficient. The preset coefficient is pre-stored in the thickness measurement device and may be, for example, 0.9999. The independent variable in the cross-correlation function is the time delay, and each function value corresponds to a time delay.

[0124] In an embodiment of the present application, after obtaining the cross-correlation function, the thickness measuring device can directly determine the maximum function value of the cross-correlation function as the maximum peak value of the cross-correlation function. Alternatively, the thickness measuring device can determine to obtain all extreme value points of the cross-correlation function, and from all extreme value points, obtain an extreme value point whose function value is greater than a target threshold. Then, the thickness measuring device can obtain the maximum peak value of the cross-correlation function based on the extreme value points whose function values ​​are greater than the target threshold. For example, the thickness measuring device can determine the maximum function value among the function values ​​corresponding to the extreme value points whose function values ​​are greater than the target threshold as the maximum peak value of the cross-correlation function. The target threshold value can be pre-stored by the thickness measuring device.

[0125] It is understandable that the material is fluid, so the size of the material contacting the ultrasound wave varies at different times. The amplitude of the second echo signal reflected by the material is positively correlated with the material's size. Since the material's size follows a normal distribution, the amplitude of the second echo signal also follows a normal distribution. Furthermore, the intensity of the first echo signal reflected from the first interface between the coating and the material is greater than the intensity of the second echo signal. Therefore, a target threshold can be set based on the expected amplitude and variance of the echo signals reflected from materials of different sizes, and the maximum peak value can then be accurately determined using the target threshold.

[0126] Optionally, the target threshold T n Can satisfy: Among them, μ r is the expected amplitude of the echo signal formed by the reflection of materials of different sizes. β is a coefficient, usually greater than or equal to 2.5 and less than or equal to 3. σr is the variance of the amplitude of the echo signal formed by the reflection of materials of different sizes. r and variance σ r Both can be obtained in advance by the thickness measuring equipment.

[0127] Step 205: Determine the thickness of the coating based on the first transmission duration and the first transmission speed of the ultrasonic signal in the coating.

[0128] The thickness is positively correlated with both the first transmission duration and the first transmission speed.

[0129] In the examples of this application, see Figure 7 The process of the thickness measuring device performing step 207 may include:

[0130] Step 2051: Determine a fourth transmission duration of the ultrasonic signal in the coating based on the first transmission duration, the second transmission duration of the ultrasonic signal in the coupling layer, and the third transmission duration of the ultrasonic signal in the material processing equipment.

[0131] The fourth transmission duration is proportional to the difference between the first transmission duration and the second and third transmission durations. For example, the fourth transmission duration is the difference, or the fourth transmission duration is the product of the difference and a preset coefficient.

[0132] In an embodiment of the present application, the second transmission duration and the third transmission duration may be pre-stored by the thickness measuring device. Alternatively, the thickness measuring device may determine the second transmission duration of the ultrasonic signal in the coupling layer based on the second transmission speed of the ultrasonic signal in the coupling layer and the thickness of the coupling layer. Furthermore, the thickness measuring device may also determine the third transmission duration of the ultrasonic signal in the material processing device based on the third transmission speed of the ultrasonic signal in the material processing device and the thickness of the material processing device.

[0133] The second transmission duration is proportional to the quotient of the thickness of the coupling layer and the second transmission speed. The third transmission duration is proportional to the quotient of the thickness of the material processing equipment and the third transmission speed. For example, the second transmission duration is the quotient of the thickness of the coupling layer and the second transmission speed. The third transmission duration is the quotient of the thickness of the material processing equipment and the third transmission speed.

[0134] Step 2052: Determine the thickness of the coating based on the fourth transmission duration and the first transmission speed of the ultrasonic signal in the coating.

[0135] The thickness is proportional to the product of the fourth transmission time and the first transmission speed. For example, the thickness can be the product.

[0136] It is understood that the order of the steps of the method for measuring the thickness of the inner wall coating of material handling equipment provided in the embodiment of the present application can be appropriately adjusted, and the steps can be increased or decreased accordingly. For example, step 203 can also be deleted according to the circumstances. Any person skilled in the art can easily think of a method of variation within the technical scope disclosed in this application, and it should be included in the scope of protection of this application, so it will not be repeated here.

[0137] In summary, the embodiment of the present application provides a method for measuring the thickness of the inner wall coating of a material processing equipment. The method can control an ultrasonic sensor located on the outer wall of the material processing equipment to transmit an ultrasonic signal and receive a target signal through the ultrasonic sensor. The target signal includes a first echo signal formed by reflection at the interface between the coating and the material in the material processing equipment, and a second echo signal formed by reflection of the material. Subsequently, the method can determine the first transmission time for the ultrasonic signal to reach the first interface based on the target signal and the ultrasonic signal, and then determine the thickness of the coating based on the first transmission time and the first transmission speed of the ultrasonic signal in the coating. Since the thickness of the inner wall coating of the material processing equipment can be measured outside the material processing equipment, there is no need to manually disassemble the material processing equipment. On the one hand, iron and metal foreign matter will not be introduced into the material, thereby avoiding the coating thickness measurement process from affecting the purity of the material; on the other hand, the material processing equipment does not need to be stopped during the thickness measurement process, that is, the coating thickness can be measured during the operation of the material processing equipment, reducing the impact on the operation of the material processing equipment. Moreover, since there is no need to manually use a thickness gauge for measurement, on the one hand, automatic monitoring of the coating thickness is achieved, and on the other hand, manual operation can be simplified and labor costs can be reduced. In addition, the method provided in the embodiment of the present application can obtain the coating thickness at any time. On the one hand, the missing coating can be discovered in time. On the other hand, the coating can be repaired when the thickness is low enough to introduce ferrous metal substances into the material, thereby improving the utilization rate of the coating.

[0138] The present invention provides a device for measuring the thickness of the coating on the inner wall of a material processing device. The device can be used to perform the method for measuring the thickness of the coating on the inner wall of a material processing device provided in the above method embodiment. The device is applied to a thickness measuring device, which is connected to an ultrasonic sensor located on the outer wall of the material processing device; see Figure 8 , the apparatus 500 may include:

[0139] Control module 501 is configured to control the ultrasonic sensor to transmit an ultrasonic signal and receive a target signal via the ultrasonic sensor. The target signal includes a first echo signal and a second echo signal. The first echo signal is generated by the ultrasonic signal reflecting off a first interface. The first interface is the interface between the coating and the material in the material processing equipment. The second echo signal is generated by the ultrasonic signal reflecting off the material.

[0140] The first determining module 502 is configured to determine a first transmission time length for the ultrasonic signal to reach the first interface based on the ultrasonic signal emitted by the ultrasonic sensor and the target signal.

[0141] The second determining module 503 is configured to determine the thickness of the coating based on the first transmission duration and the first transmission speed of the ultrasonic signal in the coating, wherein the thickness is positively correlated with both the first transmission duration and the first transmission speed.

[0142] Optionally, a coupling layer is filled between the ultrasonic sensor and the outer wall of the material processing equipment. The second determination module 503 can be used to:

[0143] Determining a fourth transmission time of the ultrasonic signal in the coating based on the first transmission time, the second transmission time of the ultrasonic signal in the coupling layer, and the third transmission time of the ultrasonic signal in the material processing equipment, where the fourth transmission time is proportional to the difference between the second transmission time and the third transmission time subtracted from the first transmission time;

[0144] The thickness of the coating is determined based on the fourth transmission duration and the first transmission speed of the ultrasonic signal in the coating. The thickness is proportional to the product of the fourth transmission duration and the first transmission speed.

[0145] Optionally, the second determining module 503 may be configured to:

[0146] determining a second transmission duration of the ultrasonic signal in the coupling layer based on a second transmission speed of the ultrasonic signal in the coupling layer and a thickness of the coupling layer;

[0147] A third transmission duration of the ultrasonic signal in the material processing equipment is determined based on a third transmission speed of the ultrasonic wave in the material processing equipment and a thickness of the material processing equipment.

[0148] Optionally, the first determining module 502 may be configured to:

[0149] determining a cross-correlation function between an ultrasonic signal emitted by an ultrasonic sensor and a target signal;

[0150] Based on the time delay corresponding to the maximum peak of the cross-correlation function, a first transmission time length of the ultrasonic signal reaching the first interface is determined, and the first transmission time length is positively correlated with the time delay.

[0151] Optional, see Figure 9 , the apparatus 500 may further include:

[0152] The acquisition module 504 is configured to acquire all extreme value points of the cross-correlation function, acquire extreme value points whose function values ​​are greater than a target threshold from all extreme value points, and acquire the maximum peak value of the cross-correlation function based on the extreme value points whose function values ​​are greater than the target threshold.

[0153] Optionally, a coupling layer is filled between the ultrasonic sensor and the outer wall of the material processing equipment. The process of the control module 501 receiving the target signal through the ultrasonic sensor may include:

[0154] receiving a mixed signal through an ultrasonic sensor, the mixed signal including: a target signal, a third echo signal, a fourth echo signal, and a noise signal, wherein the third echo signal is formed by the ultrasonic signal emitted by the ultrasonic sensor being reflected from a second interface, the second interface being the interface between the coupling layer and the material processing equipment, and the fourth echo signal is formed by the ultrasonic signal emitted by the ultrasonic sensor being reflected from a third interface, the third interface being the interface between the material processing equipment and the coating;

[0155] The interference signal is removed from the mixed signal to obtain the target signal, where the interference signal includes: the third echo signal, the fourth echo signal and the noise signal.

[0156] Optionally, the control module 501 may also be used to:

[0157] Eliminate noise signals from mixed signals;

[0158] The third echo signal and the fourth echo signal are removed from the mixed signal after the noise signal is removed to obtain the target signal.

[0159] Optionally, the control module 501 may be used to:

[0160] Converting the mixed signal from the time domain to the frequency domain to obtain a mixed signal in the frequency domain, wherein the mixed signal in the frequency domain includes multiple different frequency components;

[0161] Calculate the correlation value between each frequency component and the ultrasonic signal;

[0162] From the mixed signal in the frequency domain, frequency components with correlation values ​​lower than a correlation threshold are removed to remove the noise signal from the mixed signal.

[0163] In summary, the embodiment of the present application provides a device for measuring the thickness of the coating on the inner wall of a material processing device. The device can control an ultrasonic sensor located on the outer wall of the material processing device to transmit an ultrasonic signal and receive a target signal through the ultrasonic sensor. The target signal includes a first echo signal formed by reflection at the interface between the coating and the material in the material processing device, and a second echo signal formed by reflection from the material. Subsequently, the device can determine the first transmission time for the ultrasonic signal to reach the first interface based on the target signal and the ultrasonic signal, and then determine the thickness of the coating based on the first transmission time and the first transmission speed of the ultrasonic signal in the coating. Since the thickness of the coating on the inner wall of the material processing device can be measured outside the material processing device, there is no need to manually disassemble the material processing device. On the one hand, iron and metal foreign matter will not be introduced into the material, thereby avoiding the coating thickness measurement process from affecting the purity of the material; on the other hand, the material processing device does not need to be stopped during the thickness measurement process, that is, the coating thickness can be measured during the operation of the material processing device, reducing the impact on the operation of the material processing device. Moreover, since there is no need to manually use a thickness gauge for measurement, on the one hand, automatic monitoring of the coating thickness is achieved, and on the other hand, manual operation can be simplified and labor costs can be reduced. In addition, the method provided in the embodiment of the present application can obtain the coating thickness at any time. On the one hand, the missing coating can be discovered in time. On the other hand, the coating can be repaired when the thickness is low enough to introduce ferrous metal substances into the material, thereby improving the utilization rate of the coating.

[0164] The present application also provides a thickness measuring device for performing the thickness measurement method provided in the above method embodiment. The thickness measuring device includes a processor and a memory. The processor and the memory are connected, for example, via a bus.

[0165] The processor may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

[0166] A bus may include a path that transmits information between the components. Examples of buses include a PCI (Peripheral Component Interconnect) bus and an EISA (Extended Industry Standard Architecture) bus. Buses can be categorized as address buses, data buses, and control buses.

[0167] The memory is used to store a computer program corresponding to the thickness measurement method provided in the above method embodiment of the present application, and the computer program is controlled and executed by the processor. The processor is used to execute the computer program stored in the memory to implement the content shown in the above method embodiment.

[0168] The present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for measuring the thickness of the inner wall coating of a material processing equipment provided in the above method embodiment is implemented. For example, Figure 5 or Figure 6 The method shown.

[0169] The present application provides a computer program product, which includes a computer program or computer instructions. When the computer program or computer instructions are executed by a processor, the method for measuring the thickness of the inner wall coating of the material processing equipment provided by the above method embodiment is implemented. For example, Figure 5 or Figure 6 The method shown.

[0170] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0171] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0172] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0173] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0174] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0175] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for measuring the thickness of the inner wall coating of material handling equipment, characterized in that: Applied to a thickness measuring device, the thickness measuring device is connected to an ultrasonic sensor located on the outer wall of the material processing equipment; the method comprises: Controlling the ultrasonic sensor to transmit an ultrasonic signal and receiving a target signal through the ultrasonic sensor, the target signal including: a first echo signal and a second echo signal, the first echo signal being formed by the ultrasonic signal being reflected from a first interface, the first interface being an interface between the coating and a material in the material processing equipment, and the second echo signal being formed by the ultrasonic signal being reflected from the material; determining a first transmission time for the ultrasonic signal to reach the first interface based on the ultrasonic signal emitted by the ultrasonic sensor and the target signal; The thickness of the coating is determined based on the first transmission duration and a first transmission speed of the ultrasonic signal in the coating, where the thickness is positively correlated with both the first transmission duration and the first transmission speed.

2. The method according to claim 1, characterized in that A coupling layer is filled between the ultrasonic sensor and the outer wall of the material processing equipment; and determining the thickness of the coating based on the first transmission duration and a first transmission speed of the ultrasonic signal in the coating includes: Determining a fourth transmission duration of the ultrasonic signal in the coating layer based on the first transmission duration, the second transmission duration of the ultrasonic signal in the coupling layer, and the third transmission duration of the ultrasonic signal in the material processing equipment, wherein the fourth transmission duration is proportional to a difference obtained by subtracting the second transmission duration and the third transmission duration from the first transmission duration; The thickness of the coating is determined based on the fourth transmission time and a first transmission speed of the ultrasonic signal in the coating. The thickness is proportional to a product of the fourth transmission time and the first transmission speed.

3. The method according to claim 2, characterized in that Before determining a fourth transmission duration of the ultrasonic signal in the coating layer based on the first transmission duration, the second transmission duration of the ultrasonic signal in the coupling layer, and the third transmission duration of the ultrasonic signal in the material processing equipment, the method further includes: determining a second transmission duration of the ultrasonic signal in the coupling layer based on a second transmission speed of the ultrasonic signal in the coupling layer and a thickness of the coupling layer; A third transmission duration of the ultrasonic signal in the material processing equipment is determined based on a third transmission speed of the ultrasonic wave in the material processing equipment and a thickness of the material processing equipment.

4. The method according to any one of claims 1 to 3, characterized in that: The determining, based on the ultrasonic signal emitted by the ultrasonic sensor and the target signal, a first transmission time for the ultrasonic signal to reach the first interface includes: determining a cross-correlation function between the ultrasonic signal emitted by the ultrasonic sensor and the target signal; Based on the time delay corresponding to the maximum peak of the cross-correlation function, a first transmission time length for the ultrasonic signal to reach the first interface is determined, and the first transmission time length is positively correlated with the time delay.

5. The method according to claim 4, characterized in that Before determining the first transmission duration of the ultrasonic signal reaching the first interface based on the time delay corresponding to the maximum peak of the cross-correlation function, the method further includes: Obtaining all extreme points of the cross-correlation function; From all the extreme value points, obtain an extreme value point whose function value is greater than a target threshold; Based on an extreme point where the function value is greater than the target threshold, a maximum peak value of the cross-correlation function is obtained.

6. The method according to claim 4, characterized in that A coupling layer is filled between the ultrasonic sensor and the outer wall of the material processing equipment; and receiving a target signal through the ultrasonic sensor includes: receiving a mixed signal through the ultrasonic sensor, the mixed signal including: the target signal, a third echo signal, a fourth echo signal, and a noise signal, the third echo signal being formed by the ultrasonic signal emitted by the ultrasonic sensor being reflected from a second interface, the second interface being the interface between the coupling layer and the material processing equipment, the fourth echo signal being formed by the ultrasonic signal emitted by the ultrasonic sensor being reflected from a third interface, the third interface being the interface between the material processing equipment and the coating; The interference signal is removed from the mixed signal to obtain the target signal, where the interference signal includes: the third echo signal, the fourth echo signal, and the noise signal.

7. The method according to claim 6, characterized in that The removing the interference signal from the mixed signal to obtain the target signal includes: Eliminating the noise signal from the mixed signal; The third echo signal and the fourth echo signal are removed from the mixed signal after the noise signal is removed to obtain a target signal.

8. A device for measuring the thickness of the inner wall coating of material handling equipment, characterized in that: Applicable to thickness measuring equipment, the thickness measuring equipment is connected to an ultrasonic sensor located on the outer wall of the material processing equipment; the device includes: a control module, configured to control the ultrasonic sensor to transmit an ultrasonic signal and receive a target signal through the ultrasonic sensor, the target signal comprising: a first echo signal and a second echo signal, the first echo signal being formed by the ultrasonic signal being reflected from a first interface, the first interface being an interface between the coating and a material in the material processing equipment, and the second echo signal being formed by the ultrasonic signal being reflected from the material; a first determining module, configured to determine a first transmission time for the ultrasonic signal to reach the first interface based on the ultrasonic signal emitted by the ultrasonic sensor and the target signal; The second determination module is used to determine the thickness of the coating based on the first transmission duration and a first transmission speed of the ultrasonic signal in the coating, where the thickness is positively correlated with both the first transmission duration and the first transmission speed.

9. A thickness measuring device, characterized in that: The thickness measuring device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A thickness measurement system, characterized in that: The thickness measurement system comprises: an ultrasonic sensor, a material handling device, and the thickness measurement device according to claim 9; Wherein, the ultrasonic sensor is arranged on the outer wall of the material processing equipment and is connected to the thickness measuring equipment.

11. The thickness measurement system according to claim 10, characterized in that: An absorption layer is provided at one end of the ultrasonic sensor away from the material processing equipment.

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