Bottle body thickness measuring device and method for measuring thickness of bottle body

Abstract

The invention relates to a bottle body thickness measuring device in the technical field of bottle body thickness measurement. The bottle body thickness measuring device comprises a main body structure, a magnetic field measuring unit and a main control module. The magnetic field measuring unit is composed of a first permanent magnet, a second permanent magnet and a magnetic field inductive sensor, the first permanent magnet is arranged on the inner side of the bottle body, and one magnetic pole face of the second permanent magnet is fixed to the detection end of the sensor to form an integrated probe. And the main control module is arranged on the main body, is electrically connected with the sensor, and prestores a calibration data set corresponding to the magnetic field intensity B and the distance d of the permanent magnet. The main control module converts output signals of the sensors into magnetic field intensity values, and the distance between the two permanent magnets, namely the bottle wall thickness, is calculated through an algorithm by combining calibration data. The measuring device can conveniently and accurately measure the thickness of the bottle body.

Description

Technical Field

[0001] This invention relates to the field of bottle thickness measurement technology, specifically to a bottle thickness measuring device and a method for measuring bottle thickness. Background Technology

[0002] The bottle body is the main part of a bottle used to hold items, and its shape, material, and structure vary depending on the intended use. Bottle body thickness is a core parameter that determines its load-bearing capacity, sealing performance, and chemical stability, directly affecting the safety, shelf life, and transportability of the contained items. The thickness of bottles made of different materials has significantly different effects on this.

[0003] Taking wine bottles as an example, as the core carrier for storing wine, the thickness of the bottle wall not only directly affects the physical stability of the bottle (such as impact resistance and leakage resistance), but is also a key basis for authenticating wine. Some counterfeit high-end wine products have significantly different bottle wall thicknesses compared to genuine products due to deteriorated manufacturing processes.

[0004] Currently, methods for measuring the thickness of glass bottle walls are mainly divided into two categories: contact and non-contact. Contact methods, represented by vernier calipers, are inexpensive but difficult to adapt to curved bottle surfaces, easily causing scratches, and are prone to large human reading errors, failing to meet the needs of precise inspection. Non-contact methods mainly include ultrasonic thickness gauges and general-purpose magnetic field ranging devices. Ultrasonic thickness measurement requires filling the air gap between the probe and the bottle wall with a coupling agent, which is not only cumbersome but also carries the risk of damaging labels or coatings due to coupling agent residue. It is also more prone to failure in low-temperature, dry environments, affecting measurement stability. While general-purpose magnetic field ranging devices do not require a coupling agent, they use a combination of a universal permanent magnet and a Hall sensor, failing to consider batch-to-batch differences in magnetic field strength between individual permanent magnets, and lacking calibration for the weak shielding effect of the glass material on the magnetic field, leading to systematic measurement bias.

[0005] To overcome the aforementioned deficiencies, the applicant filed a patent application on December 8, 2025 (application number: 202511838650.8), proposing a method for measuring the thickness of wine bottles based on the positioning and coordination of a single inner magnetic bead and an outer magnetic bead. This solution effectively solves the deviation problem caused by differences in magnets and lack of calibration in general-purpose equipment by pre-storing a high-precision magnetic field strength-distance (Bd) calibration dataset for specific magnetic beads and combining it with a three-point approximation calculation method, thus significantly improving measurement accuracy.

[0006] However, this prior art solution still has an inherent flaw in practical operation that affects the final measurement accuracy: the measurement process requires placing the first magnetic bead (inner bead) inside the bottle, using the second magnetic bead (outer bead) for adsorption and positioning outside the bottle, and then quickly removing the outer magnetic bead before adjusting the magnetic field induction probe fixed on the base to align with that point for measurement. During the removal of the outer magnetic bead, the magnetic attraction and operational vibrations can easily cause the inner magnetic bead to slightly roll or shift, resulting in its strongest magnetic end no longer facing the measurement point inside the bottle. Since the magnetic field induction probe measures the magnetic field strength at a point in space, even a slight change in the direction of the inner magnetic bead will directly alter the vector superposition value of the generated magnetic field at the probe, thus introducing measurement errors and affecting the reliability and repeatability of the measurement. Furthermore, when testing non-transparent bottles such as Maotai-style bottles (non-transparent milky white sauce-flavored liquor bottles, represented by Feitian Maotai bottles), the position of the inner magnetic bead cannot be seen through the bottle because the magnetic field induction probe can only be aligned with the marked detection point. When the inner magnetic bead deviates from the marked detection point, the detection result error is significant.

[0007] Therefore, there is an urgent need for a new technology for measuring the thickness of wine bottles that can completely avoid magnetic bead displacement during the measurement process, making the operation simpler and the results more stable. Summary of the Invention

[0008] The present invention aims to provide a bottle thickness measuring device that can conveniently and accurately measure the thickness of a bottle.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a bottle thickness measuring device, comprising a main structure, a magnetic field measuring unit, and a main control module; The magnetic field measurement unit includes a first permanent magnet, a second permanent magnet, and a magnetic field sensor that cooperate to form a magnetic field ranging system. The first permanent magnet is placed inside the bottle to be measured, and one magnetic pole face of the second permanent magnet is fixed to the detection end face of the magnetic field sensor to form an integrated probe. The main control module is mounted on the main structure and is electrically connected to the magnetic field sensor. The main control module has a pre-stored calibration dataset containing the magnetic field strength B and distance d that match the first permanent magnet and the second permanent magnet. The main control module reads the electrical signal output by the magnetic field sensor and converts it into an actual magnetic field strength value. Based on the calibration dataset, a reference data group is selected, and the distance between the first permanent magnet and the second permanent magnet is calculated using a preset algorithm. This distance is the thickness of the bottle wall.

[0010] The principle of this scheme is as follows: One magnetic pole face of the second permanent magnet is fixed to the detection end face of the magnetic field sensor, forming an inseparable integrated probe. During measurement, the operator places the second permanent magnet end of the integrated probe close to the bottle wall and moves it until it is stably attached to the outer side of the bottle wall at the point to be measured by magnetic attraction with the first permanent magnet inside the bottle. At this time, under the action of magnetic force, the corresponding magnetic pole face of the first permanent magnet inside the bottle is stably attracted to the corresponding point on the inner wall of the bottle, forming a stable attraction pair with a defined magnetic field direction between the first and second permanent magnets. In this stable state, the magnetic field sensor actually measures the combined magnetic field strength at its own detection end face. This electrical signal is transmitted to the main control module and converted into an actual magnetic field strength value. The main control module compares this measured value with the pre-stored Bd calibration dataset and, using a preset algorithm, can directly and uniquely calculate the distance between the first and second permanent magnets. Since this distance spans the bottle wall, and the probe contacts the outer wall of the bottle while the inner magnet is attracted to the inner wall, this calculated distance is the thickness of the bottle wall.

[0011] The advantages of this solution are: 1. Because the integrated probe has both positioning and measurement functions, no intermediate "positioning-removal-realignment" steps are required during measurement. Once the first and second permanent magnets inside and outside the bottle are attracted, they form a stable state, and the first permanent magnet has no chance of moving during the entire measurement process. This fundamentally eliminates the vector measurement error introduced by the rolling and deflection of the inner magnetic bead due to operational jitter or magnet separation, resulting in a qualitative leap in the reliability of single measurements and the repeatability (precision) of multiple measurements.

[0012] 2. With the help of the magnetic attraction of the first and second permanent magnets, automatic coaxial alignment can be achieved, eliminating the need for manual precise alignment of the measurement point and reducing the skill requirements of the operator; moreover, the integrated probe realizes the integration of "positioning-measurement", which greatly simplifies the operation steps, shortens the measurement time of a single bottle, and is suitable for batch testing scenarios.

[0013] 3. The pre-stored calibration dataset is the exclusive matching data for the first and second permanent magnets currently in use, specifically eliminating the systematic errors caused by "batch differences in permanent magnets" in general magnetic field equipment; the integrated probe design avoids the internal magnet orientation shift caused by "removing the external magnet" in the previous solution, eliminating the errors caused by the superposition and change of magnetic field vectors; non-contact measurement does not require direct contact with the bottle surface, which will not scratch the bottle (compared to contact methods such as vernier calipers), nor does it require the use of coupling agent (compared to ultrasonic measurement), avoiding problems such as damage to bottle labels / coatings by coupling agent residue, failure in low temperature and dry environments, and reducing the interference of additional operations on the measurement results.

[0014] 4. The integrated probe design is compatible with magnetic field sensors of different ranges and accuracies. Furthermore, the core of the device consists of a main structure, an integrated magnetic field measurement unit, and a main control module, with few components and a compact structure, making it easy to carry and operate in the field.

[0015] Preferably, as an improvement, the calibration dataset is a set of data showing the correspondence between the combined magnetic field strength at the location of the magnetic field sensor and the distance between the surfaces of the two permanent magnets when the first and second permanent magnets are in opposite positions with opposite magnetic pole faces. The first and second permanent magnets are opposite each other, meaning they are in a straight line, and the magnetic pole faces are the surfaces where the permanent magnets have the strongest magnetism. When the first and second permanent magnets are opposite each other with opposite magnetic pole faces, they form a stable opposite-pole adsorption magnetic field. This magnetic field has a more regular distribution, more stable and predictable magnetic field strength decay characteristics, and can effectively avoid the magnetic field disorder caused by mutual repulsion when like poles are opposite each other. The calibration dataset constructed based on this state can accurately match the magnetic field distribution state of the two permanent magnets during actual measurement, ensuring a stronger correspondence between the measured magnetic field strength and the pre-stored calibration data, improving the accuracy of thickness calculation from the data source. Simultaneously, the opposite-pole adsorption state is an inherent stable state of the device during measurement, eliminating the need for additional adjustment of magnet polarity, further simplifying the operation process and avoiding measurement deviations caused by polarity mismatch.

[0016] Preferably, as an improvement, the calibration dataset interval is 0.05mm to 0.2mm, covering a spacing measurement range of 0.1mm to 10mm. Setting the calibration dataset interval to 0.05mm to 0.2mm ensures sufficient data density to support high-precision approximate calculations, avoiding increased interpolation errors due to excessively large data intervals, while also avoiding the problems of cumbersome calibration processes and excessive data storage due to excessively small data intervals, thus achieving a balance between accuracy and efficiency. The measurement range of 0.1mm to 10mm covers the wall thickness range of most common bottle types (such as wine bottles, beverage bottles, and medicine bottles). The lower limit of 0.1mm meets the measurement needs of thin-walled plastic bottles and thin-walled glass bottles, while the upper limit of 10mm is suitable for measuring thick-walled bottles such as storage bottles and high-end craft wine bottles, significantly improving the versatility of the device and eliminating the need to change the calibration dataset or adjust the device structure for bottles with different wall thicknesses.

[0017] Preferably, as an improvement, the preset algorithm is a three-point approximation calculation method: Two sets of reference data (d1, B1) and (d2, B2) from the calibration dataset that are closest to the actual magnetic field strength value are selected. Let the actual measured magnetic field strength be B0, and the thickness of the bottle wall to be determined be d0. Then, using the formula d0 = (d2, B1) / d2, the magnetic field strength can be approximated. d1) (B1) B2) / (B1) B0) + d1, d0 is calculated. Compared with linear interpolation, polynomial fitting and other algorithms, the three-point approximation method has the advantages of low computational load and fast response speed, enabling rapid output of thickness values, adapting to the high-efficiency requirements of batch detection, while reducing the computational load of the main control module, eliminating the need for high-performance computing chips, and reducing the cost of control devices. This algorithm selects two sets of reference data that are closest to the measured magnetic field strength for local approximation calculation, which can minimize the error caused by the nonlinear characteristics of the magnetic field strength-distance curve and ensure the accuracy of the calculation results. In addition, the algorithm logic is simple and easy to understand, which facilitates program writing and debugging. If subsequent optimization of accuracy is required, minor adjustments can be made based on the algorithm framework, which has strong flexibility.

[0018] Preferably, as an improvement, the main control module also integrates an error compensation algorithm, which includes a temperature compensation algorithm and a digital filtering algorithm. The temperature compensation algorithm is used to correct the detection error caused by temperature drift of the magnetic field sensor; the digital filtering algorithm is used to suppress dynamic interference caused by the ambient magnetic field. The integrated error compensation algorithm significantly improves the environmental adaptability and measurement stability of the device. The temperature compensation algorithm can correct the sensitivity drift and zero-point drift of components such as Hall sensors caused by changes in ambient temperature in real time, ensuring the consistency of the measurement reference under different working environments. The digital filtering algorithm (such as moving average, median filtering, etc.) can effectively suppress transient or periodic environmental magnetic field interference caused by surrounding electrical equipment, accidental proximity of ferromagnetic materials, etc., extracting true and stable magnetic signals, thereby greatly improving the repeatability accuracy and anti-interference ability of the measurement, making the measurement results more reliable.

[0019] Preferably, as an improvement, the magnetic field sensing sensor is a linear Hall sensor. A linear Hall sensor is chosen because its output voltage has a good linear relationship with the magnetic field strength component perpendicular to the chip surface. This characteristic makes the conversion from sensor signal to magnetic field strength value very direct and accurate, simplifies the design of signal conditioning circuits, and is highly compatible with the linear interpolation algorithm of calibration data. Compared to switch-type Hall sensors, linear Hall sensors provide continuous intensity information, which is key to achieving accurate distance (thickness) calculations and ensuring the sensitivity and linearity of the measurement system.

[0020] Preferably, as an improvement, both the first and second permanent magnets are spherical magnetic beads made of neodymium iron boron (NdFeB). NdFeB is currently the permanent magnet material with the highest magnetic energy product, characterized by strong magnetic field strength and magnetic stability. It can generate sufficiently strong adsorption force to ensure stable adsorption of the magnetic beads inside and outside the bottle during the measurement process, avoiding displacement due to insufficient magnetism. At the same time, the strong magnetic field can improve the signal strength of the magnetic field sensor, reduce the influence of environmental interference on the signal, and improve the signal-to-noise ratio of the measurement. The spherical magnetic beads have no sharp edges, so they will not scratch the inner wall of the bottle when placed inside. Moreover, the spherical surface can adapt to the curved surface of the bottle (such as the curved wall of a wine bottle). Regardless of the initial placement posture of the magnetic beads, they can automatically adjust to the optimal adsorption position when opposite poles are adsorbed, ensuring that the magnetic pole surfaces of the two magnetic beads are precisely aligned, further improving the regularity of the magnetic field distribution. In addition, the spherical magnetic beads are small in size and light in weight, making them easy to place in various bottles with small openings (such as narrow-necked wine bottles and medicine bottles), and will not cause the bottle to tilt or be damaged due to their own weight.

[0021] Preferably, as an improvement, the diameters of both the first and second permanent magnets are 4–6 mm. On the one hand, this size of magnetic bead has sufficient magnet volume to generate stable attraction force and magnetic field strength, ensuring that the magnetic field sensor can accurately detect the magnetic field signal and avoiding problems such as insufficient magnetic field strength and weak signal due to the magnet being too small; on the other hand, this size of magnetic bead can be easily placed into the mouth of most bottles (the diameter of the mouth of common wine bottles, beverage bottles, and medicine bottles is usually greater than 8 mm), without being too large to fit, and without being too small to cause insufficient attraction force or easy displacement.

[0022] Preferably, as an improvement, the main body structure is cylindrical, with a length of 120mm to 180mm and a diameter of 20mm to 30mm. It is equipped with a display screen, measurement buttons, and a power interface for charging the main control module. The display screen shows the bottle thickness calculated by the main control module, and the measurement buttons control the main control module to read the electrical signal output by the magnetic field sensor. The circular pen-shaped structure is ergonomically designed; the 120mm to 180mm length and 20mm to 30mm diameter facilitate one-handed operation. The display screen, buttons, and main control module are highly integrated within this circular pen-shaped main body, achieving complete integration and miniaturization of the device. Users can complete all operations and read results instantly without connecting external devices, greatly improving portability and on-site testing convenience, making it suitable for mobile measurement scenarios such as on-site quality inspection and logistics sampling.

[0023] The method for measuring bottle thickness using the aforementioned bottle thickness measuring device includes the following steps: S1: Place the first permanent magnet into the bottle; S2: On the outside of the bottle, place the second permanent magnet end of the integrated probe close to the bottle wall and move it until it is stably attached to the outside of the bottle wall at the point to be measured by magnetic attraction with the first permanent magnet inside the bottle. S3: The main control module acquires the output signal of the magnetic field sensor, calculates and outputs the bottle wall thickness value at that point based on the calibration dataset and the preset algorithm.

[0024] The measurement method described in this application condenses the complex magnetic field positioning and measurement process into three intuitive actions: "place, attract, and read." This simplified operation greatly reduces the skill requirements for operators, allowing them to operate the system without professional training. Simultaneously, the most time-consuming "precise positioning" step is replaced by automatic magnetic attraction, and the measurement is completed instantly. The measurement time for a single point can be reduced to a few seconds, which is highly beneficial for rapid sampling or full inspection of large batches of bottles, significantly improving inspection efficiency and perfectly meeting the dual requirements of speed and ease of use in industrial applications. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a wine bottle thickness measuring device according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of a wine bottle thickness measuring device in Embodiment 3 of the present invention; Figure 3 This is a schematic diagram of the structure of a wine bottle thickness measuring device in Embodiment 5 of the present invention; Figure 4 For data processing curves; Figure 5 This is the flowchart of the hardware circuit design for the main control module.

[0026] Explanation of reference numerals in the attached drawings: 1. Second permanent magnet; 2. Magnetic field sensor; 3. Transmission line; 4. Male interface terminal; 5. Main structure; 6. Bolt; 7. Main control module; 8. Display screen; 9. First button; 10. Second button; 11. Power interface; 12. Protective pad; 13. Storage cavity; 14. Sheet metal; 15. First permanent magnet; 16. Protective cover. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method: Example 1 is basically as shown in the appendix. Figure 1 As shown: A bottle thickness measuring device includes a main structure 5, a magnetic field measuring unit and a main control module 7; The magnetic field measurement unit includes a first permanent magnet 15, a second permanent magnet 1, and a magnetic field sensor 2 that cooperate to form a magnetic field ranging system. The magnetic field sensor 2 is a linear Hall sensor. The first permanent magnet 15 and the second permanent magnet 1 are both spherical magnetic beads made of neodymium iron boron material, and the diameter of the first permanent magnet 15 and the second permanent magnet 1 is 5mm. One magnetic pole surface of the second permanent magnet 1 is fixed to the detection end face of the magnetic field sensor 2 to form an integrated probe. The main control module 7 is electrically connected to the magnetic field sensor 2. The main control module 7 pre-stores a calibration dataset of magnetic field strength B and distance d that matches the first permanent magnet 15 and the second permanent magnet 1. The calibration dataset is a set of data on the relationship between the synthetic magnetic field strength at the location of the magnetic field sensor 2 and the distance between the surfaces of the two permanent magnets when the first permanent magnet 15 and the second permanent magnet 1 are in opposite positions with opposite magnetic pole surfaces. The calibration dataset interval is 0.05mm to 0.2mm, and the distance measurement range it covers is 0.1mm to 10mm. The main control module 7 reads the electrical signal output by the magnetic field sensor 2 and converts it into the actual magnetic field strength value. Based on the calibration dataset, it selects a reference data set and calculates the distance between the first permanent magnet 15 and the second permanent magnet 1 using a preset algorithm. This distance is the bottle wall thickness. The preset algorithm is a three-point approximation method: it selects two sets of reference data (d1, B1) and (d2, B2) from the calibration dataset that are closest to the actual magnetic field strength value. Let the actual measured magnetic field strength be B0, and the bottle wall thickness to be determined be d0. Then, using the formula d0 = (d2, B1) / (d2, B2), the distance is calculated as follows: d1)(B1 B2) / (B1 B0)+d1, d0 is calculated.

[0028] The main structure 5 is cylindrical, with a length of 120mm to 180mm and a diameter of 20mm to 30mm. More specifically, the main control module 7 is a microcontroller, which is fixedly connected to the main structure 5 by bolts 6. One end of the main structure 5 is provided with a female interface terminal, and the main structure 5 is provided with a storage cavity 13 for storing the first permanent magnet 15. The end of the storage cavity 13 is close to the main structure 5 and away from the female interface terminal. The end of the magnetic field sensor 2 away from the second permanent magnet 1 is connected to a transmission line 3. The other end of the transmission line 3 is provided with a male interface terminal 4 that works with the female interface terminal. The main control module 7 is electrically connected to the magnetic field sensor 2 through the transmission line 3. Iron sheets 14 and protective pads 12 are respectively provided on opposite sides inside the storage cavity 13. The iron sheets 14 are used to attract the first permanent magnet 15. When the first permanent magnet 15 is stored, it is located between the protective pads 12 and the iron sheets 14. The main structure 5 also includes a display screen 8, measurement buttons, and a power interface 11. The measurement buttons include a first button 9 and a second button 10. The first button 9 controls the on / off state of the magnetic field sensor 2, and the second button 10 controls the on / off state of the main control module 7. The display screen 8 displays the bottle thickness value calculated by the main control module 7. The hardware circuit design flowchart of the main control module 5 is shown below. Figure 5 As shown.

[0029] The difference between Example 2 and Example 1 is that the main control module 7 also integrates an error compensation algorithm, which includes a temperature compensation algorithm and a digital filtering algorithm. The temperature compensation algorithm is used to correct the detection error caused by temperature drift of the magnetic field sensor 2; the digital filtering algorithm is used to suppress dynamic interference caused by the ambient magnetic field.

[0030] Example 3 is basically as shown in the appendix. Figure 2 As shown, the only difference between it and Embodiment 1 is that: the main structure 5 has a storage cavity 13 at one end, and a protective cover 16 for opening and closing the storage cavity 13 and the power interface 11 is also threadedly connected. The protective cover 16 has internal threads, and the protective cover 16 is threadedly connected to the main structure 5 through the internal threads.

[0031] The difference between Example 4 and Example 3 is that the main control module 7 also integrates an error compensation algorithm, which includes a temperature compensation algorithm and a digital filtering algorithm. The temperature compensation algorithm is used to correct the detection error caused by temperature drift of the magnetic field sensor 2; the digital filtering algorithm is used to suppress dynamic interference caused by the ambient magnetic field.

[0032] In Examples 1 to 4, the transmission line 3 is a flexible transmission line 3.

[0033] Example 5 is basically as shown in the appendix. Figure 3 As shown, the only difference between it and embodiment 3 is that the transmission line 3 is a rigid transmission line 3.

[0034] The only difference between Example 6 and Example 5 is that the main control module 7 also integrates an error compensation algorithm, which includes a temperature compensation algorithm and a digital filtering algorithm. The temperature compensation algorithm is used to correct the detection error caused by temperature drift of the magnetic field sensor 2; the digital filtering algorithm is used to suppress dynamic interference caused by the ambient magnetic field.

[0035] Specific implementation process: The thickness of the wine bottle was tested using the wine bottle thickness measuring device in Example 3. The specific process is as follows: According to the principles of physics, the magnetic field strength generated by a permanent magnet is inversely proportional to the square of the distance between it and the magnetic field sensor 2, which can be simplified as follows: ; Where B is the magnetic field strength, and d is the distance between the first permanent magnet 15 and the second permanent magnet 1 (i.e., the bottle wall thickness). Since it is impossible for each permanent magnet to have the same magnetic field, a magnetic field sensor 2 is required to be paired with each permanent magnet. The magnetic field strength distribution of the permanent magnet paired with the magnetic field sensor 2 is measured at intervals of 0.1 mm, starting from a spacing of 0.1 mm and continuing until 10 mm. The experimental data is then distributed and written into the chip program of the main control module 7, as shown in Table 1 below.

[0036] Table 1 Recording Table of Magnetic Field Data of Permanent Magnet Axis

[0037] In Table 1: the surface spacing of the permanent magnets is the distance between the first permanent magnet 15 and the second permanent magnet 1.

[0038] To improve measurement accuracy, we use the following method for data processing: like Figure 4 As shown, the vertical axis represents the magnetic field strength B, and the horizontal axis represents the distance d between the first permanent magnet 15 and the second permanent magnet 1. Points B (d1, B1) and C (d2, B2) are pre-measured data already written into the database of the main control module, and A (d0, B0) represents the actual measured data, where B0 is the measured data and d0 is unknown data, which needs to be calculated based on the known data. When points A, B, and C are sufficiently close, we can approximate θ1 ≈ θ2, then tanθ1 ≈ tanθ2. ; The testing steps are as follows: S1. Rotate and remove the protective cap 16, take out the first permanent magnet 15 from the storage cavity 13 and put it into the bottle, tilt the bottle slightly, and then place the second permanent magnet 1 end of the integrated probe close to the bottle wall, and move it back and forth from the lowest point of the bottle until it magnetically adheres to the wall. S2. Move the integrated probe to the position to be measured, press the first button 9, the magnetic field sensor 2 will work and send the electrical signal to the main control module 7, press the second button 10 to trigger the thickness measurement, the main control module 7 will collect the electrical signal output by the magnetic field sensor 2, perform data calculation and display the specific results on the display screen 8.

[0039] To verify the reliability of the method for measuring the thickness of wine bottles in this invention, we used the following method for verification: (1) The prior patent measurement method (hereinafter referred to as Method 1, application number: 202511838650.8, application date: December 8, 2025) and the present invention patent measurement method (hereinafter referred to as Method 2) were compared with the CHY-B2 wall thickness tester produced by Jinan Sanquan Zhongshi Experimental Instrument Co., Ltd. (refer to the prior application).

[0040] (2) The CHY-B2 wall thickness tester uses laser principle for distance measurement. As a recognized instrument for measuring the thickness of wine bottles, it has extremely high measurement accuracy. Its measured value is determined as the calibrated value of the wine bottle thickness. The CHY-B2 wall thickness tester measured a result of approximately 3.40 mm (the actual value is 3.404 mm). The result measured using Method 1 was 3.45 mm (the measurement process is referred to in the prior application); the result measured using Method 2 was 3.42 mm. In the measurement process of Method 2, the instrument used was consistent with that of Method 1. The only difference was that in Method 2, one magnetic pole surface of the second permanent magnet 1 was fixed to the detection end face of the magnetic field induction sensor 2, forming an integrated probe.

[0041] The relative error of Method 1 is 1.47%, while the relative error of Method 2 is 0.59%. The latter greatly reduces the measurement error and improves the measurement accuracy, meaning that the measurement method of this patent is more reliable and superior.

[0042] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A bottle thickness measuring device, characterized in that: Includes the main structure, magnetic field measurement unit, and main control module; The magnetic field measurement unit includes a first permanent magnet, a second permanent magnet, and a magnetic field sensor that cooperate to form a magnetic field ranging system. The first permanent magnet is placed inside the bottle to be measured, and one magnetic pole face of the second permanent magnet is fixed to the detection end face of the magnetic field sensor to form an integrated probe. The main control module is mounted on the main structure and is electrically connected to the magnetic field sensor. The main control module has a pre-stored calibration dataset containing the magnetic field strength B and distance d that match the first permanent magnet and the second permanent magnet. The main control module reads the electrical signal output by the magnetic field sensor and converts it into an actual magnetic field strength value. Based on the calibration dataset, a reference data group is selected, and the distance between the first permanent magnet and the second permanent magnet is calculated using a preset algorithm. This distance is the thickness of the bottle wall.

2. The bottle thickness measuring device according to claim 1, characterized in that: The calibration dataset is a set of data showing the relationship between the synthetic magnetic field strength at the location of the magnetic field sensor and the distance between the surfaces of the two permanent magnets when the first permanent magnet and the second permanent magnet are in opposite positions with opposite magnetic pole surfaces.

3. The bottle thickness measuring device according to claim 2, characterized in that: The calibration dataset has an interval of 0.05mm to 0.2mm, and the coverage spacing measurement range is 0.1mm to 10mm.

4. The bottle thickness measuring device according to claim 3, characterized in that: The preset algorithm is a three-point approximation calculation method: Two sets of reference data (d1, B1) and (d2, B2) from the calibration dataset that are closest to the actual magnetic field strength value are selected. Let the actual measured magnetic field strength be B0, and the bottle wall thickness to be determined be d0. Then, the formula d0 = (d2, B1) / d2 is used. d1) (B1) B2) / (B1) B0) + d1, d0 is calculated.

5. A bottle thickness measuring device according to any one of claims 1 to 4, characterized in that: The main control module also integrates an error compensation algorithm, which includes a temperature compensation algorithm and a digital filtering algorithm. The temperature compensation algorithm is used to correct the detection error caused by temperature drift of the magnetic field sensor; the digital filtering algorithm is used to suppress dynamic interference caused by the ambient magnetic field.

6. The bottle thickness measuring device according to claim 5, characterized in that: The magnetic field sensing sensor is a linear Hall sensor.

7. The bottle thickness measuring device according to claim 6, characterized in that: Both the first and second permanent magnets are spherical magnetic beads made of neodymium iron boron.

8. The bottle thickness measuring device according to claim 7, characterized in that: The diameters of the first permanent magnet and the second permanent magnet are both 4 to 6 mm.

9. The bottle thickness measuring device according to claim 8, characterized in that: The main structure is cylindrical, with a length of 120mm to 180mm and a diameter of 20mm to 30mm. It is equipped with a display screen, measurement buttons, and a power interface for charging the main control module. The display screen is used to display the bottle thickness value calculated by the main control module, and the measurement buttons are used to control the main control module to read the electrical signal output by the magnetic field sensor.

10. The method for measuring bottle thickness using the bottle thickness measuring device according to any one of claims 1 / 2 / 3 / 6 / 7 / 8 / 9, characterized in that: Includes the following steps: S1: Place the first permanent magnet into the bottle; S2: On the outside of the bottle, place the second permanent magnet end of the integrated probe close to the bottle wall and move it until it is stably attached to the outside of the bottle wall at the point to be measured by magnetic attraction with the first permanent magnet inside the bottle. S3: The main control module acquires the output signal of the magnetic field sensor, calculates and outputs the bottle wall thickness value at that point based on the calibration dataset and the preset algorithm.

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