A sponge quality detection device and detection method

Abstract

The present application relates to a sponge quality inspection device, comprising a testing platform and a press, wherein the testing platform is formed with a test table for placing a sponge block to be inspected, the press is installed on the top of the testing platform, and the press is used to apply pressure to the sponge block on the test table for testing, and further comprises a curtain wall component, an imaging component, and a fill light component, wherein the curtain wall component is arranged on one side of the testing platform, and the curtain wall component has a background cloth that can be rolled up or unfolded, and the background cloth forms an imaging background of the sponge block on the test table after unfolding, and the imaging component and the fill light component are arranged on the other side opposite to the curtain wall component. By setting up the sponge quality inspection device, the test time of the processed sponge block can be shortened when conducting an elastic recovery performance test, thereby improving the efficiency of the sponge block quality inspection, so that the elastic recovery performance test can be uniformly and quickly conducted when the sponge leaves the factory.

Description

Technical Field

[0001] The present application relates to the technical field of sponge quality detection, and in particular to a sponge quality detection device and a detection method thereof. Background Art

[0002] Commonly used sponges are made from wood cellulose fibers or expanded plastic polymers. Many cushions and mattresses often use sponges as fillings. To ensure the comfort of cushions and mattresses, high elastic recovery capabilities are required. Poor-quality sponges can significantly reduce the user experience of cushions and mattresses. Therefore, elastic recovery testing is necessary to assess sponge quality.

[0003] In common sponge testing experiments, a press is typically used to apply pressure to a sponge block, causing it to deform. The time required for the block to recover is then measured to assess the sponge's elastic recovery ability. However, since a sponge takes time to recover after being squeezed and deformed, if elastic recovery testing is performed after each sponge is produced, the required recovery time for each sponge would be required, thus prolonging production time and reducing production efficiency. Summary of the Invention

[0004] In order to improve the problems raised in the above background technology, the present application provides a sponge quality detection device and a detection method thereof.

[0005] The present application provides a sponge quality detection device and a detection method thereof using the following technical solutions:

[0006] A sponge quality inspection device comprises a testing platform and a press, wherein a test table is formed on the testing platform for placing a sponge block to be inspected, the press is installed on the top of the testing platform and is used to apply pressure to the sponge block on the test table for testing, and further comprises a curtain wall component, an imaging component and a fill light component, the curtain wall component is arranged on one side of the testing platform, and the curtain wall component has a background cloth that can be rolled up or unfolded, and the background cloth forms an imaging background of the sponge block on the test table when unfolded, the imaging component and the fill light component are arranged on the other side opposite to the curtain wall component, the imaging component is provided with a visual sensor facing the sponge block on the test table, the visual sensor is used to image, capture and output an image of the elastic recovery state of the sponge block, the fill light component is arranged at a position close to the imaging component, and the fill light component is provided with a fill light with an adjustable position state, and the fill light is used to adjust the lighting state of the sponge block on the test table when imaging.

[0007] Furthermore, the curtain wall assembly also includes a bracket, a retractable motor, a winding roller, a magnetic block and a positioning seat. The retractable motor is installed on the top of the bracket, and the output end of the retractable motor is connected to the winding roller. The upper end of the background cloth is fixed on the outer wall of the winding roller, and the magnetic block is inserted into the lower end of the background cloth and fixedly connected thereto. The positioning seat is formed on the inner bottom of the bracket, and a slot that cooperates with the magnetic block is formed on the positioning seat.

[0008] Furthermore, the imaging assembly also includes a support tube, a fixed plate and a locking piece. The fixed plate is arranged above the support tube, and the fixed plate and the support tube are fixedly connected by a locking piece. A hollow inner cavity is formed on the support tube, and the wires connected to the visual sensor pass through the inner cavity of the support tube.

[0009] Furthermore, the fill light assembly also includes an up and down swing adjustment part and a left and right swing adjustment part. The up and down swing adjustment part is used to adjust the up and down deflection angle state of the fill light, and the left and right swing adjustment part is used to adjust the left and right deflection angle state of the fill light. The up and down swing adjustment part includes a support, a rotating shaft, a fixing seat, a deflection motor, a transmission assembly and a connecting shaft. The rotating shaft is inserted into the top of the support and rotatably connected thereto. The fill light is installed and fixed on the fixing seat, and the bottom of the fixing seat is sleeved on the rotating shaft and fixedly connected thereto. The deflection motor is installed inside the support. The bottom, and the output end of the deflection motor and the rotating shaft are connected by a transmission assembly, the connecting shaft is formed on the side wall of the bottom of the support platform, and the connecting shaft is used to cooperate with the connection of the left and right swing adjustment part, the left and right swing adjustment part includes a base, a first positioning frame, a second positioning frame and a linear push rod, the lower ends of the first positioning frame and the second positioning frame are fixedly connected to the base, the top end of the first positioning frame is rotatably connected to the bottom of the support platform, the output end of the linear push rod is sleeved on the connecting shaft and rotatably connected to it, and the other end of the linear push rod is rotatably connected to the top of the second positioning frame.

[0010] Furthermore, the sponge quality inspection device also includes an adsorption component. A bottom cavity is formed at the bottom of the inspection table. The adsorption component is installed in the bottom cavity and is used to adsorb and fix the sponge block on the test table. The adsorption component includes an air pump, a conducting part, an equal number of connecting pipes and a suction cup. The air pump is installed on the bottom wall of the bottom cavity, and the air suction port of the air pump is connected to the conducting part. The top of each suction cup is passed through to be flush with the upper surface of the test table, and the bottom of each suction cup is connected to the conducting part by a connecting pipe.

[0011] A method for detecting the quality of a sponge comprises the following steps:

[0012] Step 1: Place the sponge block to be tested on the test table, use the negative pressure of the adsorption component to adsorb the sponge block on the test table, and fix the position of the sponge block on the test table;

[0013] Step 1: unfold the background cloth in the curtain wall assembly and use the magnetic attraction between the magnetic block and the slot to flatten and fix the background cloth;

[0014] Step 1: Start the press and use the press to apply a constant squeezing force to the sponge sample at a certain speed until the sponge block reaches a predetermined compression amount, and record the time points of the start and end of the squeezing, as well as the height of the compressed sponge block;

[0015] Step 1: After the press is reset, the visual sensor in the imaging component is used to capture the recovery of the sponge block, and the elastic recovery performance of the sponge block is evaluated in combination with the recovery time and recovery height of the sponge block.

[0016] Furthermore, the visual sensor imaging and capturing of the recovery of the sponge block in the step includes the following two methods: Imaging method 1, imaging and capturing the sponge block recovering to the initial height or close to the initial height, recording the time required for the sponge block to recover to the initial height or close to the initial height, and obtaining the basic coefficient of the recovery time; Imaging method 2, pre-setting an initial time period of a fixed length, capturing the height state of the sponge block after the initial time period; in the process of visual sensor imaging and capturing the recovery of the sponge block, imaging method 2 is used for each sponge block passing through the test table to capture and output the sponge block image, and imaging method 1 is used for the sponge block passing through the test table to capture and output the sponge block image at intervals.

[0017] Furthermore, the sponge block images output by the visual sensor in imaging mode 1 and imaging mode 2 are also pre-processed by the computer system, so that the computer system obtains the sponge block features in the sponge block images, and then the computer system combines the calculation formula to estimate the overall recovery time of the sponge.

[0018] The calculation formula for image preprocessing of the sponge block image is as follows:

[0019] ; ;

[0020] is the pixel value of the filtered image;

[0021] is the original image pixel value;

[0022] For The neighborhood window centered on

[0023] For window The total number of pixels in ;

[0024] is the grayscale value after equalization;

[0025] is the original grayscale value;

[0026] Grayscale The number of pixels;

[0027] is the total number of pixels in the image;

[0028] After image preprocessing, the grayscale image of the sponge block can be obtained. According to the difference in grayscale values ​​between the sponge block and the image background, the size of the image area occupied by the sponge block can be counted, thereby measuring the area and height of the sponge block.

[0029] The computer system estimates the overall recovery time of the sponge as follows:

[0030]

[0031] is the estimated overall recovery time;

[0032] The recovery time basic coefficient represents the benchmark value of the time required for the sponge to fully recover from deformation under standard conditions;

[0033] is the initial recovery rate, which indicates the proportion of sponges recovered during the initial time period;

[0034] is the nonlinear factor of the recovery rate, which is used to indicate the nonlinear degree of the recovery rate changing with time;

[0035] is the recovery rate, which indicates the proportion of sponge recovery per unit time;

[0036] is the recovery rate adjustment factor, which is used to indicate the impact of external environmental conditions on the recovery rate;

[0037] is the recovery time-recovery rate relationship index, which is used to express the nonlinear relationship between recovery time and recovery rate;

[0038] is the initial recovery time, i.e., the time period corresponding to the measurement of the initial recovery rate;

[0039] The additional recovery time is the time it takes for the sponge to slowly recover after the initial recovery phase.

[0040] By setting up the sponge quality detection device and applying the sponge quality detection method, the test time of the processed sponge block can be shortened when conducting the elastic recovery performance test, and the efficiency of the sponge block quality detection is improved, so that the elastic recovery performance test of the sponge can be uniformly and quickly carried out before the sponge leaves the factory.

[0041] The beneficial technical effect of the present application is that by setting up the quality detection device of the sponge and applying the quality detection method of the sponge, the test time of the processed sponge block can be shortened when conducting the elastic recovery performance test, thereby improving the efficiency of the quality detection of the sponge block, so as to facilitate the unified and rapid elastic recovery performance test of the sponge when it leaves the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a structural schematic diagram of a sponge quality detection device according to an embodiment of the present application;

[0043] Figure 2 yes Figure 1 A schematic diagram of the structure of the quality detection device for the middle sponge from another angle;

[0044] Figure 3 This is a schematic diagram of the structure of the adsorption component in the embodiment of the present application;

[0045] Figure 4 This is a structural diagram of a curtain wall assembly in an embodiment of the present application;

[0046] Figure 5 is a schematic structural diagram of an imaging assembly in an embodiment of the present application;

[0047] Figure 6 It is a structural diagram of the fill light component in the embodiment of the present application.

[0048] Figure numerals: 10, test bench; 11, test bench; 12, bottom cavity; 20, press; 30, adsorption assembly; 31, air pump; 32, conduction part; 33, connecting pipe; 34, suction cup; 40, curtain wall assembly; 41, bracket; 42, retractable motor; 43, rewinding roller; 44, background cloth; 45, magnetic block; 46, positioning seat; 47, slot; 50, imaging assembly; 51, support tube; 52, fixed plate ; 53. Locking part; 54. Visual sensor; 541. Wire; 60. Fill light assembly; 61. Fill light; 62. Up and down swing adjustment part; 621. Support platform; 622. Rotating shaft; 623. Fixed seat; 624. Deflection motor; 625. Transmission assembly; 626. Connecting shaft; 63. Left and right swing adjustment part; 631. Base; 632. First positioning frame; 633. Second positioning frame; 634. Linear push rod. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0050] The embodiments of the present application disclose a sponge quality detection device and a detection method thereof.

[0051] Reference Figure 1 and Figure 2The quality inspection device for sponges may include a testing platform 10, a press 20, an adsorption component, a curtain wall component 40, an imaging component 50, and a fill light component 60. A test table 11 is formed on the testing platform 10 for placing the sponge block to be inspected, and a bottom cavity 12 is formed at the bottom of the testing platform 10, in which the adsorption component 30 is installed. The adsorption component 30 can be used to fix the sponge block on the testing platform 11 by negative pressure adsorption, and then the press 20 installed on the top of the testing platform 10 can apply pressure to the sponge block on the testing platform 11 to cause it to deform. The curtain wall component 40 is arranged on one side of the testing platform 10, and the imaging component 50 and the fill light component 60 are arranged on the other side opposite to the curtain wall component 40. The curtain wall component 40 has a background cloth 44 that can be rolled up or unfolded. After the background cloth 44 is unfolded, it can form an imaging background of the sponge block on the testing platform 11, and the background cloth 44 can be made of a color with a large contrast with the color of the sponge block. Imaging assembly 50 is equipped with a visual sensor 54 facing the sponge block on test bench 11. Visual sensor 54 is used to capture and output an image of the sponge block's elastic recovery state. A fill light assembly 60 is positioned near imaging assembly 50 and includes an adjustable fill light 61. Fill light 61 is used to adjust the lighting conditions when imaging the sponge block on test bench 11, thereby enhancing the imaging effect of visual sensor 54.

[0052] In this embodiment, the press 20 can be a conventional device. When applying pressure, the press 20 applies a constant compressive force to the sponge sample at a constant speed until the sponge reaches a predetermined compression, such as 50% or 75% of its original height. As a porous material, sponge exhibits excellent elasticity and compressibility. When a sponge is subjected to external compression, its internal pores are compressed, causing its shape to change. The sponge's resilience primarily stems from its internal pore structure and material properties. By recording the time it takes for a sponge to fully recover from deformation after compression, its elastic recovery performance can be intuitively assessed. If the sponge can recover to its original shape and size in a relatively short period of time, it demonstrates good elastic recovery performance; conversely, a longer recovery time indicates poor elastic recovery performance. In addition to elastic recovery performance, this testing process can also be used to assess the sponge's shape memory properties. Shape memory refers to the ability of a material to maintain a certain shape memory effect after being subjected to an external force, i.e., the material can return to its original shape after the external force is removed. Sponge is considered to have good shape memory properties if it can quickly and accurately return to its original shape after being squeezed. In furniture, mattresses, cushions, and other fields, sponge is the primary filling material. Its elastic recovery and shape memory properties directly impact the comfort and lifespan of the product. If the sponge's elastic recovery properties are poor, its shape may change after prolonged use, resulting in a loss of comfort and support.

[0053] See Figure 3 The adsorption assembly 30 may include an air pump 31, a conducting part 32, an equal number of connecting pipes 33 and suction cups 34. The air pump 31 is installed on the bottom wall of the bottom cavity 12, and the air suction port of the air pump 31 is connected to the conducting part 32. The top of each suction cup 34 is passed through to be flush with the upper surface of the test bench 11, and the bottom of each suction cup 34 is connected to the conducting part 32 by a connecting pipe 33. When the air pump 31 is evacuating air, the connecting pipe 33 connected to the conducting part 32 can be used to generate negative pressure at the suction cup 34, and the suction cup 34 arranged at the bottom of the sponge block can suck the sponge block to keep it in its position. It can be understood that after the sponge block is placed on the test bench 11, it can also be fixed in position using a clamp already available in the prior art.

[0054] See Figure 4The curtain wall assembly 40 may include a bracket 41, a retractable motor 42, a winding roller 43, a background cloth 44, a magnetic block 45 and a positioning seat 46. The retractable motor 42 is installed on the top of the bracket 41, and the output end of the retractable motor 42 is connected to the winding roller 43 so that the winding roller 43 can be driven to rotate. The upper end of the background cloth 44 is fixed to the outer wall of the winding roller 43, so that the background cloth 44 can be retracted or released downward to unfold by the rotating winding roller 43. The magnetic block 45 is inserted into the lower end of the background cloth 44 and fixedly connected thereto, and the magnetic block 45 can be made of a magnetic material, or a magnetic material can be arranged below it. A positioning seat 46 that can be adsorbed by a magnet is formed on the inner bottom of the bracket 41, and a slot 47 that cooperates with the magnetic block 45 is formed on the positioning seat 46, so that the magnetic block 45 adsorbs its inner wall after entering the slot 47 and keeps the background cloth 44 flat.

[0055] See Figure 5 The imaging assembly 50 may include a support tube 51, a fixed plate 52, a locking member 53, and a visual sensor 54. The fixed plate 52 is disposed above the support tube 51 and is fixedly connected to the support tube 51 by a locking member 53. The support tube 51 has a hollow inner cavity, through which a wire 541 connected to the visual sensor 54 can pass and be connected to a computer system.

[0056] See Figure 6 The fill light assembly 60 may include a fill light 61, a vertical swing adjustment unit 62, and a horizontal swing adjustment unit 63. The vertical swing adjustment unit 62 is used to adjust the vertical deflection angle of the fill light 61, and the horizontal swing adjustment unit 63 is used to adjust the horizontal deflection angle of the fill light 61. By adjusting the vertical swing adjustment unit 62 and the horizontal swing adjustment unit 63, the direction of the fill light 61 can be changed.

[0057] In this embodiment, the vertical swing adjustment unit 62 includes a support 621, a rotating shaft 622, a fixed base 623, a deflection motor 624, a transmission assembly 625, and a connecting shaft 626. The rotating shaft 622 is inserted into the top of the support 621 and is rotatably connected thereto. The fill light 61 is mounted and fixed to the fixed base 623, and the bottom of the fixed base 623 is sleeved on the rotating shaft 622 and fixedly connected thereto, so that the fixed base 623 and the fill light 61 can be deflected in the forward and backward directions by the rotating shaft 622. The deflection motor 624 is mounted on the inner bottom of the support 621, and the output end of the deflection motor 624 and the rotating shaft 622 are both connected by a transmission assembly 625. The transmission assembly can adopt a common belt drive, gear drive, or chain drive method, so that the rotating shaft 622 can generate a deflection motion through the deflection of the output end of the deflection motor 624 and the transmission of the transmission assembly 625. The connecting shaft 626 is formed on the bottom side wall of the support platform 621 , and the connecting shaft 626 is used to cooperate with the connection of the left and right swing adjustment part 63 .

[0058] In this embodiment, the left-right swing adjustment unit 63 includes a base 631, a first positioning frame 632, a second positioning frame 633, and a linear actuator 634. The lower ends of the first positioning frame 632 and the second positioning frame 633 are both fixedly connected to the base 631. The top end of the first positioning frame 632 is rotatably connected to the bottom of the support 621, allowing the vertical swing adjustment unit 62 and the fill light 61 to deflect left and right at the first positioning frame 632. The output end of the linear actuator 634 is sleeved on and rotatably connected to the connecting shaft 626. The other end of the linear actuator 634 is rotatably connected to the top of the second positioning frame 633, so that when the output end of the linear actuator 634 produces a telescopic movement, it can drive the vertical swing adjustment unit 62 and the fill light 61 to deflect left and right. The linear actuator 634 can be an electric actuator, a pneumatic actuator, or a hydraulic actuator, etc., which has an output end capable of linear motion.

[0059] The quality testing method of the sponge includes the following steps:

[0060] Step 1: Place the sponge block to be tested on the test table 11 , use the adsorption component 30 to absorb the sponge block on the test table 11 under negative pressure or use a clamp to clamp the sponge block on the test table 11 , and fix the position of the sponge block on the test table 11 .

[0061] Step 2: unfold the background cloth 44 in the curtain wall assembly 40 and use the magnetic attraction between the magnetic block 45 and the slot 47 to flatten and fix the background cloth 44.

[0062] Step 3: Start the press 20 and use the press 20 to apply a constant squeezing force to the sponge sample at a certain speed until the sponge block reaches a predetermined compression amount, and record the time points of the start and end of the squeezing, as well as the height of the compressed sponge block.

[0063] Step 4: After the press 20 is reset, the visual sensor 54 in the imaging assembly 50 is used to capture the recovery of the sponge block, and the elastic recovery performance of the sponge block is evaluated in combination with the recovery time and recovery height of the sponge block. The visual sensor 54 can capture the recovery of the sponge block in the following two ways: Imaging method 1, imaging and capturing the sponge block to recover to the initial height or close to the initial height, recording the time required for the sponge block to recover to the initial height or close to the initial height, and obtaining the basic coefficient of the recovery time; Imaging method 2, presetting an initial time period of a fixed length, and capturing the height state of the sponge block after the initial time period. In the process of the visual sensor 54 capturing the recovery of the sponge block, the imaging method 2 is used to capture and output the sponge block image for each sponge block passing through the test table 11 to shorten the detection time. And the imaging method 1 is used to capture and output the sponge block image for the sponge block passing through the test table 11 at intervals to correct the estimation of the elastic recovery ability of the sponge block.

[0064] In this embodiment, the sponge block images output by the visual sensor 54 in both imaging mode 1 and imaging mode 2 need to be pre-processed by a computer system so that the computer system can obtain sponge block features in the sponge block images. For example, the image pre-processing of the sponge block images may include the following calculation process:

[0065]

[0066] in, is the pixel value of the filtered image;

[0067] is the original image pixel value;

[0068] For The neighborhood window centered on

[0069] For window The total number of pixels in ;

[0070] This formula is used to remove noise from an image by calculating the average value of the pixels in a neighborhood window to replace the central pixel value.

[0071] ;

[0072] in, is the grayscale value after equalization;

[0073] is the original grayscale value;

[0074] Grayscale The number of pixels;

[0075] is the total number of pixels in the image;

[0076] This formula is used to enhance the contrast of an image by redistributing the grayscale values ​​so that the pixel values ​​in the image are more evenly distributed.

[0077] After image preprocessing of the sponge block image, a grayscale image of the sponge block image can be obtained. According to the difference in grayscale values ​​between the sponge block part and the image background part, the size of the image area occupied by the sponge block can be counted, thereby measuring the area and height of the sponge block.

[0078] After processing the sponge block image and measuring the area and height of the sponge block, the overall recovery time of the sponge can be estimated using a computer system. The estimated calculation process is as follows:

[0079]

[0080] in, is the estimated overall recovery time;

[0081] The recovery time basic coefficient represents the benchmark value of the time required for the sponge to fully recover from deformation under standard conditions. It can be obtained based on the time required by imaging method 1 or by fitting experimental data in advance. The consistency of experimental conditions needs to be ensured.

[0082] is the initial recovery rate, which indicates the proportion of sponge recovery within the initial time period. It can be calculated by analyzing the sponge block image obtained by imaging mode 2 or imaging mode 2, comparing the deformed image with the restored image;

[0083] is the nonlinear factor of the recovery rate, which is used to indicate the nonlinear degree of the recovery rate over time. It can be obtained by fitting experimental data in combination with nonlinear regression. For example, it can be described by the following nonlinear function: ,in, For in time The recovery rate (i.e. the proportion of recovery) when is the final recovery rate, that is, the maximum proportion to which the sponge block can recover when time tends to infinity (theoretically it should be 1, but in practice it may deviate slightly due to material properties or measurement errors), is the effective recovery time constant, which indicates the time required for the sponge block to recover to a certain proportion. is the parameter we hope to obtain through nonlinear regression fitting, For recovery time;

[0084] is the recovery rate, which represents the proportion of sponge recovery per unit time and can be measured through experimental data;

[0085] The recovery rate adjustment factor is used to represent the impact of external environmental conditions on the recovery rate. It can also be obtained by recording the recovery rate data under different environmental conditions (temperature, humidity), and then fitting these data using a nonlinear regression method. Under ideal conditions, it can also be set to 1.

[0086] is the recovery time-recovery rate relationship index, which is used to express the nonlinear relationship between recovery time and recovery rate. It can be obtained by combining the following calculation formula with experimental data:

[0087] ,in, For in time The recovery rate, is the initial recovery rate, i.e., at time The recovery rate, is the characteristic time constant, which indicates the time required for the recovery rate to drop to a certain ratio;

[0088] is the initial recovery time, i.e., the time period corresponding to the measurement of the initial recovery rate;

[0089] The additional recovery time is used to indicate the time it takes for the sponge to slowly recover after the initial recovery stage. The degree of recovery of the sponge at different time points can be recorded in advance according to the experimental records. The degree of recovery of the sponge in imaging method 2 can then be compared with the degree of recovery of the sponge at different time points recorded in advance to obtain the corresponding remaining recovery time.

[0090] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for detecting the quality of a sponge, characterized in that: The following steps are involved: Step 1: Place the sponge block to be tested on the test table (11), use the adsorption component (30) to negatively adsorb the sponge block on the test table (11), and fix the position of the sponge block on the test table (11); Step 2: unfold the background cloth (44) in the curtain wall assembly (40), and use the magnetic attraction between the magnetic block (45) and the slot (47) to flatten and fix the background cloth (44); Step 3, starting the press (20), applying a constant squeezing force to the sponge sample at a certain speed using the press (20) until the sponge block reaches a predetermined compression amount, and recording the time points of the start and end of the squeezing, as well as the height of the compressed sponge block; Step 4: After the press (20) is reset, the visual sensor (54) in the imaging assembly (50) is used to capture the recovery of the sponge block, and the elastic recovery performance of the sponge block is evaluated in combination with the recovery time and recovery height of the sponge block. The sponge block image output by the visual sensor (54) is also pre-processed by the computer system so that the computer system obtains the sponge block features in the sponge block image, and then the computer system estimates the overall recovery time of the sponge in combination with the calculation formula. The calculation formula for image preprocessing of the sponge block image is as follows: ; ； is the pixel value of the filtered image; is the original image pixel value; For The neighborhood window centered on For window The total number of pixels in ; is the grayscale value after equalization; is the original grayscale value; Grayscale The number of pixels; is the total number of pixels in the image; After image preprocessing, the grayscale image of the sponge block can be obtained. According to the difference in grayscale values ​​between the sponge block and the image background, the size of the image area occupied by the sponge block can be counted, thereby measuring the area and height of the sponge block. The computer system estimates the overall recovery time of the sponge as follows: is the estimated overall recovery time; The recovery time basic coefficient represents the benchmark value of the time required for the sponge to fully recover from deformation under standard conditions; is the initial recovery rate, which indicates the proportion of sponges recovered during the initial time period; is the nonlinear factor of the recovery rate, which is used to indicate the nonlinear degree of the recovery rate changing with time; is the recovery rate, which indicates the proportion of sponge recovery per unit time; is the recovery rate adjustment factor, which is used to indicate the impact of external environmental conditions on the recovery rate; is the recovery time-recovery rate relationship index, which is used to express the nonlinear relationship between recovery time and recovery rate; is the initial recovery time, i.e., the time period corresponding to the measurement of the initial recovery rate; The additional recovery time is the time it takes for the sponge to slowly recover after the initial recovery phase.

2. The method for detecting the quality of a sponge according to claim 1, wherein: In step 4, the visual sensor (54) captures the recovery of the sponge block by imaging in the following two ways: Imaging method 1: capturing the sponge block returning to its initial height or close to its initial height by imaging, recording the time required for the sponge block to return to its initial height or close to its initial height, and obtaining a basic coefficient of the recovery time; Imaging method 2: presetting an initial time period of fixed length and capturing the height state of the sponge block after the initial time period; During the process of the visual sensor (54) imaging and capturing the recovery status of the sponge block, the second imaging method is used to capture and output the image of each sponge block passing through the test table (11), and the first imaging method is used to capture and output the image of each sponge block passing through the test table (11) at intervals.

Images