Device and method for detecting hardness of packaging paper

Abstract

The invention discloses a packaging paper hardness detection device and method, and relates to the technical field of packaging paper hardness detection.The device comprises a detection table, a set of supporting legs are installed on the bottom face of the detection table, and a clamping mechanism is arranged on the upper surface of the detection table. Through the high-precision clamping mechanism, stable fixation of paper is achieved, uniform stress in the detection process is ensured, the detection accuracy is improved, nondestructive detection and multi-parameter measurement are achieved through ultrasonic non-contact detection and optimized measurement parameter adjustment, the detection precision is improved, and the detection efficiency is improved. The intelligent control module is used for self-adaptive parameter adjustment according to limited information, manual operation errors are reduced, predictive detection of packaging paper with unknown characteristics is achieved based on big data analysis and a pre-established model, powerful support is provided for packaging paper quality control and product research and development, and the whole device is reasonable in structural design, suitable for various types of paper and high in practicability. And wide applicability and stability are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging paper hardness detection, and in particular relates to a packaging paper hardness detection device and method. Background Art

[0002] Packaging paper refers to paper materials used to package various items. There are many types of packaging paper, including kraft paper, cardboard, corrugated paper, etc. Packaging paper plays a vital role in commodity packaging. It not only protects commodities from physical damage, moisture, dust, etc., but also affects the display effect and transportation convenience of commodities to a certain extent. The hardness of packaging paper is one of its key performance indicators. Accurately testing the hardness is of great significance to ensuring the quality of packaging. Packaging paper with appropriate hardness can ensure effective support and protection of products during the packaging process, and avoid damage to products due to external forces such as squeezing and collision during transportation and storage. At the same time, in some specific packaging application scenarios, such as gift packaging with high requirements for product appearance or precision instrument packaging with strict requirements for product stability, the hardness of packaging paper must meet precise standards, otherwise it may affect the overall quality and market competitiveness of the product.

[0003] However, the existing packaging paper hardness detection technology has the defect of mobility. Traditional detection methods often rely on simple pressure test principles and are easily disturbed by paper surface conditions, environmental factors, etc., resulting in inaccurate and unstable detection results. Moreover, these methods can usually only detect packaging paper with known characteristics, and it is difficult to effectively predict paper with unknown characteristics, which cannot meet the needs of the modern packaging industry for high-precision and intelligent detection. Therefore, it is necessary to propose a packaging paper hardness detection device and method to solve the problems in the prior art. Summary of the invention

[0004] The purpose of the present invention is to make up for the shortcomings of the prior art and to provide a packaging paper hardness detection device and method, which can introduce ultrasonic propagation characteristics for hardness detection, avoid the influence of factors such as surface flatness and test environment on traditional pressure detection methods, and more accurately reflect the internal structure and hardness characteristics of the packaging paper, thereby improving the accuracy of the detection results.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A packaging paper hardness detection device, the device comprises a detection platform, a group of supporting legs are installed on the bottom surface of the detection platform, a clamping mechanism is arranged on the upper surface of the detection platform, the clamping mechanism comprises a limit frame fixedly embedded on the upper surface of the detection platform, the inner wall of the limit frame is slidably connected with two moving blocks, a motor is installed on the outer surface of the limit frame, a positive and negative screw rod is installed on the output end of the motor, and the positive and negative screw rod is threadedly connected with the two moving blocks, a detection mechanism is installed on the upper surface of the detection platform, the detection mechanism comprises two limit grooves opened on the upper surface of the detection platform, the inner walls of the two limit grooves are both provided with connecting blocks, the outer surfaces of the two connecting blocks are both provided with two damping sheets, and the damping sheets are in sliding contact with the inner walls of the limit grooves, the upper surfaces of the two connecting blocks are both provided with supporting plates, and the sides of the two supporting plates close to each other are respectively provided with an ultrasonic transmitting module and an ultrasonic receiving module, a display host is installed on the upper surface of the detection platform, a data acquisition and processing module and a storage module are arranged inside the display host, and a control module is installed on the upper surface of the detection platform.

[0007] As a preferred solution of this embodiment, two slide grooves 1 are provided on the inner wall of the limit frame, and the inner walls of the two slide grooves 1 are slidably connected to two sliders 1, and the sliders 1 are connected to the moving block.

[0008] As a preferred solution of this embodiment, a clamping frame is installed on the top of the two moving blocks, an electric push rod is installed on the upper surface of the two clamping frames, a clamping plate is installed on the output end of the two electric push rods, and a silicone protective strip is installed on the bottom surface of the two clamping plates.

[0009] As a preferred solution of this embodiment, two slide grooves 2 are provided on the inner walls of the two clamping frames, and a slider 2 is slidably connected to the inner wall of each slide groove 2, and the slider 2 is connected to the clamping plate.

[0010] The embodiment of the present invention further provides a measuring method applicable to the above-mentioned packaging paper hardness detection device, the method comprising the following steps:

[0011] Place the packaging paper to be tested between the clamping frames of the clamping mechanism, start the device, manually record the basic information of the paper, and manually input relevant information or select a preset parameter configuration file through the control module. The control module matches the best measurement parameters from the pre-stored database according to the input or selected information, and automatically adjusts the measurement parameters of the ultrasonic transmitting module and the ultrasonic receiving module and the pushing speed of the electric push rod;

[0012] The motor starts, driving the forward and reverse screws to rotate, so that the two moving blocks drive the clamping frame to move. The edge position of the paper is manually observed, and the clamping frame is roughly close to the edge of the paper. Then the electric push rod drives the clamping plate to move downward to start clamping the paper. The pressure sensor monitors the clamping force in real time.

[0013] The control module controls the ultrasonic transmitting module to transmit ultrasonic signals to the paper, and the ultrasonic waves propagate inside the paper. The ultrasonic receiving module receives the ultrasonic signals after propagation through the paper, and converts them into electrical signals and transmits them to the data acquisition and processing module of the display host. The data acquisition and processing module collects, amplifies, filters and digitally processes the electrical signals to obtain the propagation time t and attenuation coefficient α of the ultrasonic waves in the paper.

[0014] The display host uses a built-in data processing algorithm to calculate the paper hardness value H based on the collected ultrasonic propagation characteristic data and the pre-stored big data model. The big data model is a relationship model H=f(t,α) between the paper hardness H and the ultrasonic propagation time t and the attenuation coefficient α established through a large amount of experimental data, where f(t,α) is a functional relationship obtained by fitting based on the experimental data;

[0015] The result output is displayed on the display screen of the display host, and the detection data is stored in the storage module for subsequent data analysis and model optimization.

[0016] As a preferred solution of this embodiment, in the step of obtaining the propagation time t and the attenuation coefficient α of the ultrasonic wave in the paper, the data acquisition and processing module measures the ultrasonic wave emission time t 1 and receiving time t 2 , calculate the propagation time t = t 2 -t 1 , and according to the ultrasonic emission intensity I 0 and receiving intensity I, according to the formula Calculate the attenuation coefficient α, where L is the distance the ultrasonic wave propagates in the paper.

[0017] As a preferred solution of this embodiment, in the step of calculating the hardness value H of the paper, the method for constructing the big data model H=f(t,α) is: collecting a variety of packaging paper samples of different types, thicknesses and hardnesses, performing ultrasonic testing on each sample, and obtaining its propagation time t i and the attenuation coefficient α i At the same time, the standard hardness test method is used to obtain the corresponding hardness value H i , and then use the multiple regression analysis method to fit the functional relationship f(t,α), so that minimum, where n is the number of samples.

[0018] As a preferred solution of this embodiment, in the step of matching the best measurement parameters from a pre-stored database according to the input and selected information, the database stores a correspondence table between basic information of different types of paper and measurement parameters. The control module searches for matching measurement parameters in the correspondence table according to the input basic information of the paper. If no completely matching information is found, the interpolation method and the nearest neighbor method are used to determine the approximate measurement parameters.

[0019] As a preferred solution of this embodiment, when the motor is started to drive the forward and reverse screws to rotate, so that the two moving blocks drive the clamping frame to move, the rotation speed v of the motor is set according to the preset moving speed parameter v 0 and paper size information, if the paper size is large, reduce the rotation speed v=k 1 v 0 , where 0 <k 1 <1, if the paper size is small, increase the rotation speed v=k 2 v 0 , where k 2 >1.

[0020] As a preferred solution of this embodiment, the electric push rod drives the clamping plate to move downward to start clamping the paper, and the pressure sensor monitors the clamping force in real time. When the clamping force F detected by the pressure sensor reaches the preset minimum clamping force F min The electric push rod stops pushing. If the clamping force exceeds the preset maximum clamping force F during pushing, max , the electric push rod moves in the opposite direction for a certain distance to adjust the clamping force within the appropriate range, where F min and F max Determined according to paper type and experimental experience.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention uses a high-precision clamping mechanism to achieve stable fixation of paper, ensure uniform force during the detection process, improve detection accuracy, and introduce ultrasonic propagation characteristics for hardness detection, which can avoid the influence of factors such as surface flatness and test environment on traditional pressure detection methods, and more accurately reflect the internal structure and hardness characteristics of the packaging paper, thereby improving the accuracy of the test results. With the help of an intelligent control module, adaptive parameter adjustment is performed based on limited information to reduce human operation errors. Based on big data analysis and pre-established models, predictive detection of packaging paper with unknown characteristics is achieved, providing strong support for packaging paper quality control and product development. The overall device structure is reasonably designed and is applicable to a variety of types of paper, ensuring wide applicability and stability.

[0023] (2) The present invention places the paper to be tested between two clamping frames, and the motor drives the forward and reverse screws to rotate, so that the two moving blocks approach each other, and then adjust the position of the clamping frame. The output end of the electric push rod moves downward to start clamping the paper, which can adapt to papers of different sizes. Then, the two support plates are pushed so that the ultrasonic transmitting module and the ultrasonic receiving module are respectively in contact with the two ends of the packaging paper to be tested, and the propagation speed and attenuation degree of the ultrasonic wave inside the packaging paper are used to accurately infer its hardness, thereby avoiding the influence of factors such as surface flatness and test environment on the traditional pressure detection method, and more accurately reflecting the internal structure and hardness characteristics of the packaging paper.

[0024] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the packaging paper hardness detection device of the present invention;

[0027] Figure 2 It is a three-dimensional structural schematic diagram of the clamping mechanism in the packaging paper hardness detection device of the present invention;

[0028] Figure 3 It is a schematic diagram of the internal structure of the clamping frame in the packaging paper hardness detection device of the present invention;

[0029] Figure 4 It is a schematic diagram of the three-dimensional structure of the limit frame in the packaging paper hardness detection device of the present invention;

[0030] Figure 5 It is a three-dimensional structural schematic diagram of the detection mechanism in the packaging paper hardness detection device of the present invention.

[0031] As shown in the figure: 1. Testing table; 2. Support legs; 3. Clamping mechanism; 301. Limiting frame; 302. Moving block; 303. Motor; 304. Forward and reverse screw rods; 305. Slideway 1; 306. Slider 1; 307. Clamping frame; 308. Electric push rod; 309. Clamping plate; 310. Silicone protective strip; 311. Slideway 2; 312. Slider 2; 4. Testing mechanism; 401. Limiting groove; 402. Connecting block; 403. Damping plate; 404. Support plate; 405. Ultrasonic transmitting module; 406. Ultrasonic receiving module; 5. Display host; 6. Control module. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1 :

[0034] This embodiment describes in detail the specific structure of the packaging paper hardness detection device, the connection relationship between the various components and its working principle.

[0035] See also Figure 1 As shown, the embodiment of the present invention provides a packaging paper hardness testing device which mainly comprises a testing platform 1 as a basic support part. A group of support legs 2 installed on the bottom surface of the testing platform 1 provide stable support for the entire device, ensuring that the device will not shake or move during the testing process. The design height of the support legs 2 has been carefully considered, so that the testing platform 1 is at a suitable height for operation, which is convenient for operators to place and take out packaging paper samples, and at the same time ensures that the testing mechanism 4 and the clamping mechanism 3 can accurately process the paper.

[0036] See also Figures 2 to 4As shown, the clamping mechanism 3 is located on the upper surface of the detection platform 1, and its core component, the limit frame 301, is fixedly embedded on the detection platform 1. The two moving blocks 302 slidably connected to the inner wall of the limit frame 301 are the key to realizing the position adjustment of the clamping frame 307. The motor 303 is installed on the outer surface of the limit frame 301, and the positive and negative screw rods 304 at its output end are threadedly connected with the moving blocks 302. When the motor 303 is started, the positive and negative screw rods 304 rotate. Due to the action of the threads, the two moving blocks 302 will move toward or away from each other in the limit frame 301. For example, when it is necessary to reduce the distance between the clamping frames 307 to adapt to the size of the paper, the motor 303 drives the positive and negative screw rods 304 to rotate, so that the moving blocks 302 drive the clamping frames 307 to approach each other. In order to ensure the smooth movement of the moving block 302, two sliding grooves 305 opened on the inner wall of the limit frame 301 cooperate with a slider 306 connected to the moving block 302. The slider 306 slides in the sliding groove 305 to limit the moving direction of the moving block 302 and prevent it from deflecting or rotating.

[0037] See also Figures 2 to 4 As shown, the clamping frame 307 at the top of the moving block 302 is used to support the edge of the paper. The electric push rod 308 installed on the upper surface of the clamping frame 307 can drive the clamping plate 309 to move up and down. The working principle of the electric push rod 308 is based on electromagnetic induction or hydraulic drive. When receiving the instruction of the control module 6, the driving device inside the electric push rod 308 will push or pull the clamping plate 309. The silicone protective strip 310 on the bottom surface of the clamping plate 309 plays a buffering and protective role when clamping the paper to prevent the paper from being clamped. At the same time, the two slide grooves 311 opened on the inner wall of the clamping frame 307 cooperate with the slider 312 connected to the clamping plate 309 to ensure that the clamping plate 309 remains vertical and stable during the up and down movement, so that the clamping force is evenly distributed on the paper.

[0038] See also Figure 5As shown, two limit grooves 401 on the upper surface of the detection platform 1 provide sliding tracks for the connection block 402 of the detection mechanism 4. The damping plate 403 installed on the outer surface of the connection block 402 is in sliding contact with the inner wall of the limit groove 401. The material characteristics of the damping plate 403 enable the connection block 402 to generate a certain friction force when moving in the limit groove 401, so that it can remain stable at any position. This characteristic is crucial for adjusting the relative position of the ultrasonic transmitting module 405 and the ultrasonic receiving module 406. For example, when detecting paper of different sizes, the position of the connection block 402 in the limit groove 401 can be manually adjusted so that the ultrasonic transmitting module 405 and the ultrasonic receiving module 406 are accurately aligned with the area to be tested of the paper. After adjustment, the friction of the damping plate 403 can prevent the connection block 402 from being displaced due to slight external force. The support plate 404 installed on the upper surface of the connection block 402 provides a stable support platform for the ultrasonic transmitting module 405 and the ultrasonic receiving module 406. The ultrasonic transmitting module 405 can transmit ultrasonic signals of specific frequency and intensity according to the instructions of the control module 6. The piezoelectric ceramic transducer inside it generates mechanical vibration under the stimulation of the electrical signal, thereby transmitting ultrasonic waves to the paper. The ultrasonic waves propagate inside the paper. When passing through the fiber structure and other media of the paper, their propagation speed and attenuation degree will change. These changes are closely related to the hardness of the paper. The ultrasonic receiving module 406 is responsible for receiving the ultrasonic signal after passing through the paper. Its working principle is opposite to that of the transmitting module. It converts the received mechanical vibration into an electrical signal and transmits it to the data acquisition and processing module of the display host 5 for subsequent processing.

[0039] In this embodiment, the data acquisition and processing module inside the display host 5 is responsible for performing a series of complex processing on the electrical signal transmitted by the ultrasonic receiving module 406. First, the electrical signal is amplified to enhance the signal strength for subsequent processing. Then, a filtering operation is performed to remove noise interference in the signal and improve the signal quality. Then, digital processing is performed to convert the analog signal into a digital signal for computer analysis. The data acquisition and processing module calculates the propagation time of the ultrasonic wave in the paper by accurately measuring the ultrasonic wave emission time and reception time. At the same time, the attenuation coefficient is calculated according to a specific formula based on the ultrasonic wave emission intensity and reception intensity.

[0040] The storage module is used to store a large amount of detection data, including ultrasonic propagation characteristic data of different types of paper under different detection conditions, corresponding hardness values, and a database for matching measurement parameters. The control module 6 serves as the "brain" of the entire device and coordinates the work of various components. It receives information from sensors and manual input, and controls the movement of the motor 303 and the electric push rod 308 according to preset algorithms and programs, and adjusts the measurement parameters of the ultrasonic transmitting module 405 and the ultrasonic receiving module 406 to realize the automation and intelligence of the detection process. For example, when the operator enters the basic information of the paper, the control module 6 searches for the best matching measurement parameters from the database of the storage module, and then sends instructions to relevant components to enable the device to perform detection in the optimal state.

[0041] Embodiment 2 :

[0042] This embodiment describes in detail a complete method and operation flow for testing the hardness of packaging paper using the above-mentioned testing device.

[0043] The operator first carefully places the packaging paper to be tested between the clamping frames 307 of the clamping mechanism 3, and then carefully records the basic information of the paper, such as the source of the paper, possible uses, appearance characteristics, etc. This information can provide a reference for the subsequent selection of appropriate measurement parameters. Next, the operator manually inputs relevant information through the operation interface of the control module 6 or selects a parameter combination suitable for the current paper situation from the preset parameter configuration file.

[0044] After receiving the information, the control module 6 immediately searches for the best matching measurement parameters from the database pre-stored in the storage module. The database stores a rich correspondence between the basic information of different types of paper and the measurement parameters. These relationships are obtained through a large number of experiments and data analysis. If the input paper information does not completely match the records in the database, the control module 6 will use algorithms such as interpolation or nearest neighbor method to determine the approximate measurement parameters. For example, if the input paper thickness is between two standard thickness values ​​in the database, the control module 6 will calculate the corresponding measurement parameters based on the interpolation method. At the same time, the control module 6 automatically adjusts the measurement parameters such as the emission frequency and emission intensity of the ultrasonic emission module 405 and the sensitivity of the ultrasonic receiving module 406 according to the determined measurement parameters, and adjusts the pushing speed of the electric push rod 308 to prepare for subsequent detection.

[0045] The motor 303 is started, and the motor 303 starts to drive the forward and reverse screw rods 304 to rotate according to the instruction of the control module 6. The rotation of the forward and reverse screw rods 304 drives the two moving blocks 302 to move in the limit frame 301, so that the clamping frame 307 adjusts the position.

[0046] In this process, the operator assists in observing the edge position of the paper to ensure that the clamping frame 307 is roughly close to the edge of the paper. The rotation speed of the motor 303 is dynamically adjusted according to the preset movement speed parameters and paper size information. If the paper size is large, in order to ensure the accuracy and stability of the movement, the motor 303 will reduce the rotation speed, for example, the rotation speed is adjusted to a certain ratio of the preset speed, such as 0.5 times; if the paper size is small, in order to improve the detection efficiency, the motor 303 will increase the rotation speed, such as adjusting it to 1.5 times the preset speed. When the position of the clamping frame 307 is roughly appropriate, the electric push rod 308 starts working and drives the clamping plate 309 to move downward. During the downward movement of the clamping plate 309, the pressure sensor monitors the clamping force in real time.

[0047] When the clamping force detected by the pressure sensor reaches the preset minimum clamping force, the electric push rod 308 stops pushing to ensure that the paper is stably clamped. If the clamping force exceeds the preset maximum clamping force during the pushing process, the electric push rod 308 will immediately move in the opposite direction for a certain distance to adjust the clamping force within an appropriate range to prevent the paper from being damaged. The preset minimum clamping force and maximum clamping force are determined based on the paper type and a large amount of experimental experience. Different types of paper may have different suitable clamping force ranges.

[0048] When the paper is stably clamped, the control module 6 controls the ultrasonic transmitting module 405 to transmit an ultrasonic signal to the paper. The transducer inside the ultrasonic transmitting module 405 converts the electrical signal into mechanical vibration, generates ultrasonic waves of a specific frequency and intensity, and propagates toward the paper. When the ultrasonic wave propagates inside the paper, it interacts with the fiber structure and density of the paper, and its propagation speed and attenuation degree change.

[0049] After a certain period of time, the ultrasonic wave reaches the other side of the paper and is received by the ultrasonic receiving module 406. The ultrasonic receiving module 406 converts the received mechanical vibration into an electrical signal and transmits it to the data acquisition and processing module of the display host 5. The data acquisition and processing module first amplifies the electrical signal to enhance the signal strength for subsequent processing, and then removes noise interference in the signal through filtering operations to improve the signal quality.

[0050] Then, the analog signal is converted into a digital signal through digital processing. After that, the data acquisition and processing module accurately measures the ultrasonic emission and reception time, and calculates the ultrasonic propagation time t (t = t 2 -t 1 , where t 1 is the launch time, t 2 is the receiving moment), and at the same time, according to the ultrasonic emission intensity I 0 and receiving intensity I, according to the formula (Wherein, L is the distance that the ultrasonic wave propagates in the paper, which can be determined according to the fixed distance between the clamping frames 307 or other measurement methods) calculate the attenuation coefficient α.

[0051] During the measurement process, in order to obtain more comprehensive and accurate paper hardness information, the control module 6 can control the electric push rod 308 to drive the ultrasonic transmitting module 405 and the ultrasonic receiving module 406 to perform multi-point and multi-directional mobile measurements on the paper surface as needed, and collect ultrasonic propagation characteristic data from different positions and angles.

[0052] The display host 5 uses the built-in data processing algorithm to calculate the paper hardness value H based on the collected ultrasonic propagation characteristic data (propagation time t and attenuation coefficient α) and the pre-stored big data model. The big data model H = f (t, α) is a relationship model between paper hardness and ultrasonic propagation characteristics established through a large amount of experimental data. When constructing this model, a variety of packaging paper samples of different types, thicknesses and hardness are first collected, and each sample is ultrasonically tested to obtain its propagation time t i and the attenuation coefficient α i At the same time, the standard hardness test method (such as the physical test method specified in the relevant industry standards) is used to obtain the corresponding hardness value H i , and then use multiple regression analysis and other methods to fit the functional relationship f(t,α), so that Minimum, where n is the number of samples. Through this model, the display host 5 can calculate the hardness value of the paper according to the newly collected ultrasonic propagation characteristic data.

[0053] Finally, the calculated hardness result is output and displayed on the display screen of the display host 5 for easy viewing by the operator. At the same time, the test data will be stored in the storage module for subsequent data analysis and model optimization to continuously improve the accuracy and reliability of the test. If the data is abnormal or the result does not meet expectations during the test, the cause of the problem can be found by analyzing the stored data, and the test method can be further improved or the device parameters can be adjusted.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the same elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A packaging paper hardness detection device, characterized in that: The device comprises a testing platform (1), a group of supporting legs (2) are installed on the bottom surface of the testing platform (1), a clamping mechanism (3) is arranged on the upper surface of the testing platform (1), the clamping mechanism (3) comprises a limit frame (301) fixedly embedded on the upper surface of the testing platform (1), two moving blocks (302) are slidably connected to the inner wall of the limit frame (301), a motor (303) is installed on the outer surface of the limit frame (301), a forward and reverse screw rod (304) is installed at the output end of the motor (303), and the forward and reverse screw rod (304) is threadedly connected to the two moving blocks (302), and a testing mechanism (4) is installed on the upper surface of the testing platform (1), and the testing mechanism (4) comprises two moving blocks (302) opened on the upper surface of the testing platform (1). A limit groove (401) is provided, the inner walls of the two limit grooves (401) are both provided with connection blocks (402), the outer surfaces of the two connection blocks (402) are both provided with two damping plates (403), and the damping plates (403) are in sliding contact with the inner walls of the limit grooves (401), the upper surfaces of the two connection blocks (402) are both provided with support plates (404), and the sides of the two support plates (404) close to each other are respectively provided with an ultrasonic transmitting module (405) and an ultrasonic receiving module (406), the upper surface of the detection platform (1) is provided with a display host (5), the interior of the display host (5) is provided with a data acquisition and processing module and a storage module, and the upper surface of the detection platform (1) is provided with a control module (6).

2. The packaging paper hardness detection device according to claim 1, characterized in that: The inner wall of the limit frame (301) is provided with two slide grooves (305), and the inner walls of the two slide grooves (305) are slidably connected to two sliders (306), and the sliders (306) are connected to the moving block (302).

3. The packaging paper hardness detection device according to claim 1, characterized in that: A clamping frame (307) is installed at the top of the two moving blocks (302), an electric push rod (308) is installed on the upper surface of the two clamping frames (307), a clamping plate (309) is installed at the output end of the two electric push rods (308), and a silicone protective strip (310) is installed on the bottom surface of the two clamping plates (309).

4. The packaging paper hardness detection device according to claim 3, characterized in that: The inner walls of the two clamping frames (307) are each provided with two second slide grooves (311), the inner wall of each second slide groove (311) is slidably connected with a second slider (312), and the second slider (312) is connected to the clamping plate (309).

5. A measuring method applicable to the packaging paper hardness testing device according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: The packaging paper to be inspected is placed between the clamping frames (307) of the clamping mechanism (3), the device is started, basic information of the paper is manually recorded, and relevant information is manually input or a preset parameter configuration file is selected through the control module (6). The control module (6) matches the best measurement parameters from a pre-stored database based on the input or selected information, and automatically adjusts the measurement parameters of the ultrasonic transmitting module (405) and the ultrasonic receiving module (406) and the pushing speed of the electric push rod (308); The motor (303) starts and drives the forward and reverse lead screw (304) to rotate, causing the two moving blocks (302) to drive the clamping frame (307) to move. Manually assist in observing the position of the paper edge, roughly move the clamping frame (307) close to the paper edge, and then the electric push rod (308) drives the clamping plate (309) to move downward to start clamping the paper. The pressure sensor monitors the clamping force in real time; The control module (6) controls the ultrasonic transmitting module (405) to transmit ultrasonic signals to the paper. The ultrasonic waves propagate inside the paper, and the ultrasonic receiving module (406) receives the ultrasonic signals after propagation through the paper and converts them into electrical signals and transmits them to the data acquisition and processing module of the display host (5). The data acquisition and processing module collects, amplifies, filters, and digitally processes the electrical signals to obtain the propagation time t and attenuation coefficient α of the ultrasonic waves in the paper; The display host (5) uses the built-in data processing algorithm to calculate the hardness value H of the paper based on the collected ultrasonic propagation characteristic data and the pre-stored big data model. The big data model is a relationship model H = f(t, α) between the paper hardness H and the ultrasonic propagation time t and attenuation coefficient α established through a large amount of experimental data, where f(t, α) is a functional relationship fitted based on the experimental data; The result is output and displayed on the display screen of the display host (5), and at the same time, the detection data is stored in the storage module for subsequent data analysis and model optimization.

6. The measuring method of the packaging paper hardness detection device according to claim 5, characterized in that: In the step of obtaining the propagation time t and attenuation coefficient α of the ultrasonic wave in the paper, the data acquisition and processing module calculates the propagation time t=t2-t1 by measuring the ultrasonic wave emission time t1 and the reception time t2, and calculates the propagation time t=t2-t1 according to the ultrasonic wave emission intensity I0 and the reception intensity I according to the formula Calculate the attenuation coefficient α, where L is the distance the ultrasonic wave propagates in the paper.

7. The measuring method of the packaging paper hardness detection device according to claim 5, characterized in that: In the step of calculating the hardness value H of the paper, the method for constructing the big data model H=f(t,α) is as follows: collect a variety of packaging paper samples of different types, thicknesses and hardnesses, perform ultrasonic testing on each sample, and obtain its propagation time t i and the attenuation coefficient α i At the same time, the standard hardness test method is used to obtain the corresponding hardness value H i , and then use the multiple regression analysis method to fit the functional relationship f(t,α), so that minimum, where n is the number of samples.

8. The measuring method of the packaging paper hardness detection device according to claim 5, characterized in that: In the step where the control module (6) matches the best measurement parameters from the pre-stored database according to the input and selected information, the database stores a correspondence table between the basic information of different types of papers and the measurement parameters. The control module (6) searches for the matching measurement parameters in the correspondence table according to the input paper basic information. If no completely matching information is found, interpolation method and nearest neighbor method are used to determine approximate measurement parameters.

9. The measuring method of the packaging paper hardness detection device according to claim 5, characterized in that: In the step where the motor (303) starts and drives the forward and reverse lead screw (304) to rotate, causing the two moving blocks (302) to drive the clamping frame (307) to move, the rotation speed v of the motor (303) is determined according to the preset moving speed parameter v0 and the paper size information. If the paper size is large, the rotation speed v is reduced to v = k1v0, where 0 < k1 < 1. If the paper size is small, the rotation speed v is increased to v = k2v0, where k2 > 1.

10. The measuring method of the packaging paper hardness detection device according to claim 5, characterized in that: The electric push rod (308) drives the clamping plate (309) to move downward to start clamping the paper, and the pressure sensor monitors the clamping force in real time. When the clamping force f detected by the pressure sensor reaches a preset minimum clamping force F min When the electric push rod (308) stops pushing, if the clamping force exceeds the preset maximum clamping force F during the pushing process max , the electric push rod (308) moves in the opposite direction for a certain distance to adjust the clamping force within a suitable range, where F min and F max Determined according to paper type and experimental experience.

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