Paper softness measuring device and method thereof

Abstract

The invention provides a paper softness measuring device and method, and relates to the technical field of paper softness measurement, the device comprises a measuring device body, the outer surface of the measuring device body is provided with a display screen, and the outer surface of the measuring device body is provided with a self-adaptive controller. By means of the self-adaptive clamping mechanism, accurate clamping of paper of various sizes can be achieved, the high-adaptability and high-stability clamping effect is achieved, the application range of the device is greatly widened, and by means of a thickness sensor, a material recognition sensor and a self-adaptive controller, the thickness of the paper can be accurately measured through the thickness sensor, the material recognition sensor and the self-adaptive controller. According to the method, paper characteristics can be quickly obtained, optimal measurement parameters can be matched from a database, accurate measurement is realized, the accuracy and reliability of measurement results are improved, different measurement path plans are adopted for regular and irregular paper, paper softness related data can be comprehensively obtained, a softness value can be accurately calculated, and the method is suitable for large-scale popularization and application. And comprehensive and efficient measurement of the softness of the paper is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of paper softness measurement, and in particular relates to a paper softness measurement device and a method thereof. Background Art

[0002] With the continuous progress of society and the vigorous development of various industries, paper is everywhere. The diversity of its uses has also given rise to the requirements for diversified and refined paper performance. Among them, paper softness is a very influential quality indicator. Paper in different application scenarios has very different requirements for it. For example, toilet paper emphasizes the soft touch of the user at the moment of contact, and must have extremely high softness to ensure the comfort of the skin. Writing paper must have moderate softness while ensuring a certain writing fluency to avoid the pen tip scratching the paper or writing jams. In order to protect fragile items, packaging paper must have a certain toughness and consider softness to adapt to complex packaging shapes. Therefore, the softness of paper is an important quality indicator of paper measurement.

[0003] However, the existing paper softness measuring devices still have certain defects when used. Most of the existing paper softness measuring devices have the problem of poor adaptability. The clamping mechanism can often only fix paper of standard size. It is difficult to effectively fix special-shaped or non-standard size paper, resulting in inaccurate measurement. Moreover, the measurement parameters are usually fixed and cannot be dynamically adjusted according to the actual characteristics of the paper, which cannot meet the precise measurement requirements of diversified paper. Therefore, it is necessary to propose a paper softness measuring 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 provide a paper softness measurement device and method. It can cooperate with an adaptive clamping mechanism and a control algorithm to process paper of various sizes and materials, meet the detection needs of multiple scenarios, and use multi-parameter comprehensive measurement, high-precision hardware and intelligent data processing to greatly improve the accuracy of softness measurement and provide a reliable basis for paper quality control.

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

[0006] A device for measuring the softness of paper, the device comprising a main body of the measuring device, wherein a display screen is arranged on the outer surface of the main body of the measuring device, an adaptive controller is installed on the outer surface of the main body of the measuring device, the internal database of the adaptive controller stores optimal measurement parameters, an adaptive clamping mechanism is installed on the upper surface of the main body of the measuring device, the adaptive clamping mechanism comprises two moving frames and two clamping frames, both of the two moving frames are connected to the main body of the measuring device, moving blocks are slidably connected to the inner walls of both of the two moving frames, and the moving blocks are connected to the clamping frames, displacement sensors are installed on the upper surfaces of both of the two clamping frames, servo motors are installed on the outer surfaces of both of the two moving frames, lead screws with reverse threads are installed at the output ends of both of the two servo motors, and the lead screws with reverse threads are in threaded connection with the moving blocks, a thickness sensor and a material identification sensor are installed on the outer surface of the main body of the measuring device, an electric push rod is installed on the outer surface of the main body of the measuring device, and a measuring sensor is installed at the output end of the electric push rod.

[0007] As a preferred solution of this embodiment, clamping plates are arranged inside both of the two clamping frames, clamping cylinders are installed on the upper surfaces of both of the two clamping frames, the output ends of the clamping cylinders are connected to the clamping plates, and pressure sensors are installed on the bottom surfaces of both of the two clamping plates.

[0008] As a preferred solution of this embodiment, silica gel pads are installed on the inner bottom walls of both of the two clamping frames, and a group of silica gel strips are installed on the bottom surfaces of both of the two clamping plates.

[0009] As a preferred solution of this embodiment, two sliding grooves I are formed in the inner walls of both of the two moving frames, a slider I is slidably connected to the inner wall of each of the two sliding grooves I, and the slider I is connected to the moving block.

[0010] As a preferred solution of this embodiment, two sliding grooves II are formed in the inner walls of both of the two clamping frames, a slider II is slidably connected to the inner wall of each of the two sliding grooves II, and the slider II is connected to the clamping plate.

[0011] The embodiment of the present invention further provides a measuring method applicable to the above-mentioned device for measuring the softness of paper, the method comprising the following steps:

[0012] Place the paper to be tested steadily inside the main body of the measuring device at the adaptive clamping mechanism;

[0013] The displacement sensors of the adaptive clamping mechanism work first, sense the boundary position information of the paper, and transmit the data to the adaptive controller;

[0014] The adaptive controller drives the servo motor to operate according to the received information, drives the lead screw with reverse threads to rotate, makes the moving block move, and then adjusts the position of the clamping frame to accurately fit the edge of the paper;

[0015] The clamping cylinder starts, driving the clamping plate to move downward to start clamping the paper, and the pressure sensor monitors the clamping force in real time;

[0016] The thickness sensor and the material identification sensor conduct a preliminary detection on the paper, obtain the thickness and material information of the paper, and transmit the data to the adaptive controller;

[0017] Based on the paper characteristic data received, the adaptive controller matches the optimal measurement parameters from the pre-stored database, and automatically adjusts the sensitivity of the measurement sensor and the pushing speed of the electric push rod;

[0018] The adaptive controller starts the electric push rod, drives the measurement sensor to approach and contact the paper at a set speed, and records the pressure-displacement data of the paper during the force application process;

[0019] During the measurement process, if necessary, the adaptive controller controls the electric push rod to drive the measurement sensor to conduct multi-point and multi-directional measurements on the paper surface to comprehensively obtain the data related to the softness of the paper;

[0020] Based on the measured data, using the built-in data processing algorithm, calculate the softness value of the paper, and output the result for display on the display screen.

[0021] As a preferred solution of this embodiment, the time for the displacement sensor to sense the paper boundary position information and transmit it to the adaptive controller does not exceed 3 seconds, and the time for the adaptive controller to drive the servo motor to operate, drive the positive and negative lead screw to rotate, and move the moving block to the preset position does not exceed 5 seconds.

[0022] As a preferred solution of this embodiment, the time for the adaptive controller to complete the adjustment of the measurement sensor sensitivity from receiving the paper characteristic data does not exceed 2 seconds, and the time for completing the adjustment of the pushing speed of the electric push rod does not exceed 3 seconds. And the adjusted measurement sensor sensitivity S and the paper thickness h satisfy the relationship: where k1, k2 are preset constants, k1>0, k2>0, and the pushing speed v of the electric push rod and the elastic modulus E of the paper material satisfy the relationship: where k3, k4 are preset constants, k3>0, k4>0.

[0023] As a preferred solution of this embodiment, during the softness measurement process, the paper is in a regular shape, and the adaptive controller controls the electric push rod to drive the measurement sensor to conduct measurements on the paper surface along a preset grid-like path. The grid node spacing d and the paper area A satisfy the relationship: Where k5 and k6 are preset constants, k5>0, k6>0. The paper is in an irregular shape. The adaptive controller controls the electric push rod to drive the measurement sensor to start from the center of gravity of the paper and gradually measure outward along a spiral path. The distance between adjacent measurement points gradually increases, and the increase ratio coefficient is k7, k7>0.

[0024] As a preferred solution of this embodiment, the built-in data processing algorithm uses the least squares method to fit the pressure-displacement data. Define the pressure as P and the displacement as X. The fitting curve equation is P = aX 2 + bX + c, where a, b, and c are fitting coefficients. The softness value of the paper is obtained by fitting multiple groups of measurement data. The calculation formula is: softness Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) Through the set adaptive clamping mechanism, the present invention can achieve precise clamping of papers of various sizes, realizing a clamping effect with high adaptability and high stability, greatly broadening the application range of the device. With the help of the thickness sensor, the material identification sensor, and the adaptive controller, the characteristics of the paper can be quickly obtained and the best measurement parameters can be matched from the database to achieve precise measurement, improving the accuracy and reliability of the measurement results. Different measurement path planning is adopted for regular and irregular shaped papers, and relevant data related to the softness of the paper can be comprehensively obtained and the softness value can be accurately calculated, realizing a comprehensive and efficient measurement of the softness of the paper.

[0026] (2) By placing the paper to be measured between two clamping frames, the displacement sensor can sense the boundary position information of the paper during operation and transmit the data to the adaptive controller. The adaptive controller drives the servo motor to drive the forward and reverse lead screw to rotate. The rotation of the forward and reverse lead screw can make the two moving blocks approach each other, thereby adjusting the position of the clamping frame to accurately fit the edge of the paper. The clamping cylinder is activated to drive the clamping plate to move downward to start clamping the paper, which can adapt to papers of different sizes and achieve a high adaptability clamping effect of the device.

[0027] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. Brief Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 Schematic perspective view of the paper softness measuring device of the present invention;

[0030] Figure 2 Schematic perspective view of the adaptive clamping mechanism in the paper softness measuring device of the present invention;

[0031] Figure 3 Schematic internal structure view of the moving frame in the paper softness measuring device of the present invention;

[0032] Figure 4 Schematic perspective view of the clamping frame in the paper softness measuring device of the present invention;

[0033] Figure 5 Flow chart of the measuring method of the paper softness measuring device of the present invention.

[0034] As shown in the figure: 1, measuring device body; 2, display screen; 3, adaptive controller; 4, adaptive clamping mechanism; 401, moving frame; 402, clamping frame; 403, moving block; 404, displacement sensor; 405, servo motor; 406, positive and negative lead screw; 407, clamping plate; 408, clamping cylinder; 409, pressure sensor; 410, silicone pad; 411, silicone strip; 412, chute one; 413, slider one; 414, chute two; 415, slider two; 5, thickness sensor; 6, material identification sensor; 7, electric push rod; 8, measuring sensor. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] Please refer to Figure 1As shown in the figure, an embodiment of the present invention provides a paper softness measuring device mainly composed of a measuring device body 1. The measuring device body 1 serves as the basic framework of the entire device, carrying various components and ensuring their coordinated operation. A display screen 2 is provided on its outer surface. The display screen 2 adopts a high-resolution liquid crystal display screen, which can clearly and intuitively display measurement results, device operating status, and various prompt messages, facilitating operators to obtain data in real time and understand the device situation. An adaptive controller 3 is also installed on the outer surface of the measuring device body 1. As the core control unit of the device, the adaptive controller 3 is equipped with a high-performance processor inside and runs advanced control algorithms. It is responsible for receiving sensor data, analyzing and processing it, and issuing instructions to control the actions of other components, ensuring the automation and intelligence of the entire measurement process.

[0037] Please refer to Figures 2 to 4 As shown in the figure, an adaptive clamping mechanism 4 is installed on the upper surface of the measuring device body 1. It is the key part to achieve precise clamping of papers of different sizes. It includes two moving frames 401 and two clamping frames 402. The two moving frames 401 are firmly connected to the measuring device body 1 through high-strength bolts to ensure that there will be no shaking or displacement during the working process. The inner walls of the moving frames 401 are designed with precise slideways, and moving blocks 403 are slidably connected to the inner walls. The moving blocks 403 are connected to the clamping frames 402 by welding, enabling the clamping frames 402 to move horizontally smoothly under the guidance of the moving frames 401. A displacement sensor 404 is installed on the upper surface of each clamping frame 402. The displacement sensor 404 adopts a high-precision laser displacement sensor. Its working principle is to emit a laser beam and receive the reflected light, and calculate the distance from the paper edge based on the light propagation time, so as to accurately sense the boundary position information of the paper. Servo motors 405 are installed on the outer surfaces of the two moving frames 401. The servo motors 405 are high-precision servo motors with the characteristics of fast response and high-precision positioning. The output ends of the servo motors 405 are installed with left-right threaded screws 406. The left-right threaded screws 406 are threadedly connected to the moving blocks 403. When the servo motors 405 receive the driving signals from the adaptive controller 3, the left-right threaded screws 406 will drive the moving blocks 403 to move left and right in the moving frames 401 according to the forward and reverse rotations of the motors, thereby adjusting the positions of the clamping frames 402 to enable them to precisely fit the paper edges and achieve adaptive clamping of papers of different widths.

[0038] Please refer to Figures 2 to 4As shown in the figure, clamping plates 407 are provided inside both of the two clamping frames 402. Clamping cylinders 408 are installed on the upper surfaces of the clamping frames 402. The output ends of the clamping cylinders 408 are rigidly connected to the clamping plates 407 through piston rods. Pressure sensors 409 are installed on the bottom surfaces of both of the two clamping plates 407. The pressure sensors 409 adopt highly sensitive strain gauge type pressure sensors and can monitor the magnitude of the clamping force in real time. When clamping paper, the clamping cylinders 408 drive the clamping plates 407 to move downward according to the instructions of the adaptive controller 3. The pressure sensors 409 feedback the detected clamping force data to the adaptive controller 3. Once the clamping force exceeds or is lower than the preset safe range, the adaptive controller 3 immediately adjusts the air pressure of the clamping cylinders 408, thereby accurately controlling the clamping strength, which can not only ensure that the paper is firmly clamped, but also avoid damage to the paper due to excessive clamping force.

[0039] Please refer to Figures 2 to 4 As shown in the figure, in order to protect the paper from being scratched and increase the friction during the clamping process, silica gel pads 410 are pasted on the inner bottom walls of both of the two clamping frames 402. The silica gel pads 410 have the characteristics of being soft, wear-resistant and anti-slip. A group of silica gel strips 411 are installed on the bottom surfaces of both of the two clamping plates 407. The silica gel strips 411 are evenly distributed, further improving the clamping stability and the protection effect on the paper. In order to ensure the smoothness and accuracy of the movement of the moving blocks 403 and the clamping plates 407, two first chutes 412 are opened on the inner walls of both of the two moving frames 401. A first slider 413 is slidably connected to the inner wall of each first chute 412. The first slider 413 and the moving block 403 are firmly connected by bolts; two second chutes 414 are opened on the inner walls of both of the two clamping frames 402. A second slider 415 is slidably connected to the inner wall of each second chute 414. The second slider 415 and the clamping plate 407 are also connected by bolts. When the moving blocks 403 and the clamping plates 407 move, the sliders slide in the chutes, playing a guiding and stabilizing role.

[0040] Please refer to Figure 1As shown in the figure, a thickness sensor 5 and a material identification sensor 6 are installed on the outer surface of the measuring device body 1. The thickness sensor 5 uses a high-precision ultrasonic thickness sensor, which measures the thickness of the paper by using the time difference of ultrasonic waves propagating in the paper, and can quickly and accurately obtain the thickness information of the paper. The material identification sensor 6 is based on spectral analysis technology. By emitting light of a specific wavelength and analyzing the spectral characteristics of the reflected light, it can identify the material type of the paper, such as ordinary paper, cardboard, special paper, etc. After the paper is placed in place, these two sensors can quickly conduct a preliminary detection on the characteristics of the paper such as thickness and material, and transmit the data to the adaptive controller 3. An electric push rod 7 is also installed on the outer surface of the measuring device body 1. The electric push rod 7 is a high-precision linear electric push rod, which has the characteristics of accurate stroke and stable thrust. A measuring sensor 8 is installed at the output end of the electric push rod 7. The measuring sensor 8 can be a high-precision pressure sensor or a force sensor, which is used to sense the force exerted by the paper on it during the measurement process, so as to obtain pressure-displacement data. Under the control of the adaptive controller 3, the electric push rod 7 can accurately adjust the position of the measuring sensor 8 to achieve precise measurement of different parts or different states of the paper.

[0041] The embodiment of the present invention also provides detailed steps of a method for measuring the softness of paper as follows:

[0042] First, turn on the power of the paper softness measuring device to ensure that all components of the device are normally powered on and initialized. Place the paper to be tested steadily inside the measuring device body 1 located in the adaptive clamping mechanism 4. When placing, try to make the paper in a horizontal state to avoid tilting or wrinkling affecting the measurement results.

[0043] The displacement sensor 404 of the adaptive clamping mechanism 4 immediately starts to work. The laser beam emitted by the displacement sensor 404 quickly scans the edge of the paper. Its high-precision laser measurement technology can accurately sense the boundary position information of the paper within a very short time of no more than 3 seconds, and transmit the data to the adaptive controller 3 at a high speed.

[0044] After receiving the data from the displacement sensor 404, the adaptive controller 3 quickly analyzes and calculates, generates a drive signal according to the preset control algorithm, and drives the servo motor 405 to operate. With its fast response characteristics, the servo motor 405 drives the positive and negative lead screw 406 to rotate quickly, so that the moving block 403 moves smoothly within the moving frame 401, and then adjusts the position of the clamping frame 402. During the whole process, the adaptive controller 3 through closed-loop control continuously adjusts the rotation speed and steering of the servo motor 405 according to the feedback data of the displacement sensor 404 to ensure that the clamping frame 402 can accurately fit the edge of the paper. The time from the start of the servo motor 405 to the moving block 403 moving to the preset position does not exceed 5 seconds.

[0045] Next, the clamping cylinder 408 is activated and drives the clamping plate 407 to move downward at a constant speed according to the instructions of the adaptive controller 3 to start clamping the paper. At this time, the pressure sensor 409 installed on the bottom surface of the clamping plate 407 monitors the clamping force in real time. The pressure sensor 409 converts the pressure signal into an electrical signal and transmits it to the adaptive controller 3.

[0046] While the paper is being clamped, the thickness sensor 5 and the material identification sensor 6 simultaneously perform a preliminary detection on the paper. The thickness sensor 5 emits ultrasonic waves and receives the reflected waves, and accurately calculates the paper thickness based on the propagation time of the ultrasonic waves in the paper; the material identification sensor 6 emits a specific spectrum and analyzes the characteristics of the reflected spectrum to quickly identify the paper material. They transmit the information such as the paper thickness and material obtained to the adaptive controller 3 in the form of digital signals.

[0047] After receiving the paper characteristic data, the adaptive controller 3 performs a quick match in the internal database to find the corresponding optimal measurement parameters. A large number of optimal measurement parameter combinations for papers with different thicknesses and materials are stored in the database. These parameters are obtained through pre-experiments and calibrations. The time for the adaptive controller 3 to complete the sensitivity adjustment of the measurement sensor 8 from receiving the paper characteristic data does not exceed 2 seconds, and the time to complete the pushing speed adjustment of the electric push rod 7 does not exceed 3 seconds. The sensitivity S of the adjusted measurement sensor 8 and the paper thickness h satisfy the relationship where k1 and k2 are preset constants, k1>0, k2>0. For example, when the paper is thicker, the sensitivity calculated according to this formula will decrease accordingly to meet the measurement requirements of thicker papers; the pushing speed v of the electric push rod 7 and the elastic modulus E of the paper material satisfy the relationship where k3 and k4 are preset constants, k3>0, k4>0. For paper materials with a larger or harder elastic modulus, the pushing speed will be appropriately reduced to ensure the measurement accuracy.

[0048] The adaptive controller 3 activates the electric push rod 7. The electric push rod 7 drives the measurement sensor 8 to smoothly approach and contact the paper surface at a set speed according to the adjusted pushing speed. During the measurement process, the measurement sensor 8 records the pressure-displacement data of the paper during the force application process in real time.

[0049] If the paper is in a regular shape, such as rectangular, circular, etc., the adaptive controller 3 controls the electric push rod 7 to drive the measurement sensor 8 to perform measurements on the paper surface along a preset grid-like path. The grid node spacing d and the paper area A satisfy the relationship Where k5 and k6 are preset constants, k5>0, k6>0. For example, for a larger-sized paper, the grid node spacing will increase accordingly, which can not only ensure full coverage of the paper surface for measurement but also improve the measurement efficiency. The measurement sensor 8 starts from a corner of the paper and moves horizontally or vertically to the next grid node position in sequence, staying at each node for a short time, such as 0.5 seconds, to obtain stable pressure-displacement data.

[0050] If the paper is irregularly shaped, the adaptive controller 3 controls the electric push rod 7 to drive the measurement sensor 8 to start from the center of gravity of the paper. By initially scanning and calculating the shape of the paper to determine the center of gravity position, it measures gradually outward along a spiral path, and the spacing between adjacent measurement points gradually increases. The increase ratio coefficient is k7, k7>0. At the beginning, the measurement point spacing is small, and as the distance from the center of gravity increases, the measurement point spacing gradually increases. In this way, while focusing on the central area of the paper, which is usually the key area where the force and softness change, it can also conduct a relatively comprehensive measurement of the entire paper to obtain sufficient measurement data.

[0051] After the measurement is completed, based on the measured pressure-displacement data, the device calculates using the built-in data processing algorithm. This algorithm uses the least squares method to fit the pressure-displacement data. Define the pressure as P, the displacement as X, and the fitting curve equation is P = aX 2 +bX + c, where a, b, and c are fitting coefficients. By fitting multiple groups of measurement data, the values of a, b, and c are determined, and then according to the calculation formula for softness The softness value of the paper is calculated.

[0052] Finally, the adaptive controller 3 transmits the calculated softness value of the paper to the display screen 2, and the display screen 2 displays the result in a clear and prominent manner for the operator to view and record. At the same time, the device can also store the measurement data and results as needed for subsequent analysis and traceability. The entire measurement process is efficient and accurate, capable of meeting the softness measurement requirements of different types of papers, and providing a reliable basis for paper quality inspection.

[0053] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the same elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A device for measuring the softness of paper, characterized in that, The device includes a measuring device body (1), a display screen (2) is arranged on the outer surface of the measuring device body (1), an adaptive controller (3) is installed on the outer surface of the measuring device body (1), and the optimal measurement parameters are stored in the internal database of the adaptive controller (3). An adaptive clamping mechanism (4) is installed on the upper surface of the measuring device body (1). The adaptive clamping mechanism (4) includes two moving frames (401) and two clamping frames (402). Both of the two moving frames (401) are connected to the measuring device body (1). A moving block (403) is slidably connected to the inner wall of each of the two moving frames (401), and the moving block (403) is connected to the clamping frame (402). A displacement sensor (404) is installed on the upper surface of each of the two clamping frames (402). A servo motor (405) is installed on the outer surface of each of the two moving frames (401). A forward and reverse lead screw (406) is installed at the output end of each of the two servo motors (405), and the forward and reverse lead screw (406) is threadedly connected to the moving block (403). A thickness sensor (5) and a material identification sensor (6) are installed on the outer surface of the measuring device body (1). An electric push rod (7) is installed on the outer surface of the measuring device body (1), and a measuring sensor (8) is installed at the output end of the electric push rod (7).

2. The paper softness measuring device according to claim 1, wherein A clamping plate (407) is arranged inside each of the two clamping frames (402). A clamping cylinder (408) is installed on the upper surface of each of the two clamping frames (402), and the output end of the clamping cylinder (408) is connected to the clamping plate (407). A pressure sensor (409) is installed on the bottom surface of each of the two clamping plates (407).

3. The paper softness measuring device according to claim 2, characterized in that, A silicone pad (410) is installed on the inner bottom wall of each of the two clamping frames (402), and a group of silicone strips (411) are installed on the bottom surface of each of the two clamping plates (407).

4. The paper softness measuring device according to claim 1, characterized in that, Two chutes one (412) are opened on the inner wall of each of the two moving frames (401). A slider one (413) is slidably connected to the inner wall of each chute one (412), and the slider one (413) is connected to the moving block (403).

5. The paper softness measuring device according to claim 2, wherein, Two chutes two (414) are opened on the inner wall of each of the two clamping frames (402). A slider two (415) is slidably connected to the inner wall of each chute two (414), and the slider two (415) is connected to the clamping plate (407).

6. A measurement method applicable to the paper softness measurement device described in any one of claims 1-5, characterized in that, The method includes the following steps: Place the paper to be tested stably inside the measuring device body (1) at the adaptive clamping mechanism (4); The displacement sensor (404) of the adaptive clamping mechanism (4) senses the boundary position information of the paper and transmits the data to the adaptive controller (3); Based on the received information, the adaptive controller (3) drives the servo motor (405) to operate, drives the forward and reverse lead screw (406) to rotate, makes the moving block (403) move, and then adjusts the position of the clamping frame (402) to precisely fit the edge of the paper; The clamping cylinder (408) starts, driving the clamping plate (407) to move downward to start clamping the paper, and the pressure sensor (409) monitors the clamping force in real time; The thickness sensor (5) and the material identification sensor (6) conduct a preliminary detection of the paper, obtain the thickness and material information of the paper, and transmit the data to the adaptive controller (3); The adaptive controller (3) matches the best measurement parameters from the pre-stored database according to the received paper characteristic data, and automatically adjusts the sensitivity of the measurement sensor (8) and the pushing speed of the electric push rod (7); The adaptive controller (3) starts the electric push rod (7), drives the measurement sensor (8) to approach and contact the paper at a set speed, and records the pressure-displacement data of the paper during the force application process; During the measurement process, if necessary, the adaptive controller (3) controls the electric push rod (7) to drive the measurement sensor (8) to perform multi-point and multi-directional measurements on the paper surface to comprehensively obtain the data related to the softness of the paper; Based on the measured data, the softness value of the paper is calculated using the built-in data processing algorithm, and the result is output and displayed on the display screen (2).

7. The measuring method of the paper softness measuring device according to claim 6, characterized in that, The time for the displacement sensor (404) to sense the paper boundary position information and transmit it to the adaptive controller (3) does not exceed 3 seconds, and the time for the adaptive controller (3) to drive the servo motor (405) to operate, drive the lead screw (406) to rotate, and move the moving block (403) to the preset position does not exceed 5 seconds.

8. The measuring method of the paper softness measuring device according to claim 6, characterized in that, The time taken by the adaptive controller (3) from receiving the paper property data to completing the sensitivity adjustment of the measurement sensor (8) is no more than 2 seconds, and the time taken to complete the pushing speed adjustment of the electric push rod (7) is no more than 3 seconds. Moreover, the sensitivity S of the adjusted measurement sensor (8) and the paper thickness h satisfy the relationship: where k1 and k2 are preset constants, k1 > 0, k2 > 0, and the pushing speed v of the electric push rod (7) and the elastic modulus E of the paper material satisfy the relationship: where k3 and k4 are preset constants, k3 > 0, k4 > 0.

9. The measuring method of the paper softness measuring device according to claim 6, characterized in that, During the softness measurement process, the paper is in a regular shape. The adaptive controller (3) controls the electric push rod (7) to drive the measurement sensor (8) to measure on the paper surface along a preset grid-shaped path. The grid node spacing d and the paper area A satisfy the relationship: where k5 and k6 are preset constants, k5 > 0, k6 > 0. When the paper is in an irregular shape, the adaptive controller (3) controls the electric push rod (7) to drive the measurement sensor (8) to start from the center of gravity of the paper and gradually measure outward along a spiral path. The spacing between adjacent measurement points gradually increases, and the increase ratio coefficient is k7, k7 > 0.

10. The measuring method of the paper softness measuring device according to claim 6, characterized in that, The built-in data processing algorithm uses the least squares method to fit the pressure-displacement data. Define the pressure as P, the displacement as X, and the fitting curve equation as P = aX 2 + bX + c, where a, b, and c are fitting coefficients. The paper softness value is obtained by fitting multiple groups of measurement data. The calculation formula is: softness

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