A system for photographing and wearing pressure testing the coil structure of tubular elastic knitted fabric

Abstract

The present invention discloses a system for photographing the coil structure of a tubular stretch knitted fabric and testing its wearing pressure. The testing system comprises four parts: an auxiliary stretching device, an image capturing and measuring system, a pressure testing system, and a PC. The present invention places the tubular stretch knitted fabric on a cylindrical mold of the auxiliary stretching device, achieving varying degrees of stretching by replacing molds and baffles of varying sizes. The image capturing and measuring system is used to observe and photograph the coil morphology, while the pressure testing system's sensors synchronously test the pressure values ​​at corresponding positions under stretching conditions. Finally, the PC receives the tested coil image and pressure data for software control, data reception, and data storage. Compared to real-person testing, this method is easier to operate and has controllable fabric tensile deformation.

Description

Technical Field

[0001] The present invention relates to a testing system and a testing method in the technical field of clothing pressure testing, and in particular to a system for photographing and wearing pressure testing a tubular elastic knitted fabric coil structure. Background Art

[0002] Tubular stretch knits are a widely used type of knitted fabric. Typically constructed from weft-knitted fabrics, they exhibit excellent compression and elongation properties. These products, such as socks, tights, and stretch pants, are found in everyday wear. These products offer a well-fitting and comfortable fit, and some also possess functional properties. For example, tights and body shaping garments can achieve a sculpting effect and are popular among women. Athletes can also wear stretch pants to prevent muscle injuries, and high-pressure compression stockings can help improve varicose veins. Currently, demand for comfortable compression clothing is increasing. Excessive pressure can lead to health problems, while insufficient pressure can result in poor performance. Therefore, customized compression clothing technology has become a hot topic of research. In addition to material properties, coil structure and knitting process parameters are crucial for achieving the desired compression in tubular stretch knits. Therefore, a device is needed to measure the pressure of such tubular stretch knits while simultaneously observing changes in the coil structure.

[0003] Existing methods for measuring the pressure of tubular stretch knit fabrics fall into two main categories: real-person wear testing and mannequin wear testing. Both methods utilize pressure-sensing devices equipped with sensors, such as airbag, resistive, or hydraulic testers, to measure pressure at various locations. However, real-person testing typically involves measuring the actual wear of the fabric on a subject. While this method yields more realistic data, it is subject to significant individual variability, subjectivity, and inconvenience. Mannequin wear testing typically utilizes mannequins or fixed-torso mannequins, but its disadvantages include high cost and fixed dimensions.

[0004] Existing methods for observing the coil structure of elastic fabrics include: stretching the fabric flat using a tensile tester and then observing the coil structure; laying the fabric flat and observing the coil structure with a microscope. However, these methods are complex and cannot simulate the stretching of tubular knitted fabrics. The testing device and method of the present invention can simultaneously measure pressure and observe the coil structure at the corresponding position, facilitating the study of the relationship between coil structure and pressure, thus overcoming the shortcomings of these testing methods. Summary of the Invention

[0005] The present invention provides a tubular elastic knitted fabric coil structure photographing and wearing pressure testing system, which can synchronously measure the coil structure and pressure changes of the tubular elastic knitted fabric under stretching conditions.

[0006] The technical solution adopted in the present invention is:

[0007] It includes an auxiliary stretching device, an image shooting and measuring device, a pressure testing device and a PC terminal; the image shooting and measuring device is arranged above the auxiliary stretching device, the auxiliary stretching device is electrically connected to the pressure testing device, and the image shooting and measuring device and the pressure testing device are electrically connected to the PC terminal respectively;

[0008] The auxiliary stretching device includes a support model, a fixed bracket, a partition, a fixed hard plate, a movable rod and a fixed rod; the two fixed hard plates are arranged vertically and spaced apart from each other, and the two fixed hard plates are fixedly connected by fixed brackets at four corners, each of the fixed hard plates is respectively provided with a first through hole, and the two ends of the fixed rod are respectively inserted into the first through holes of the two fixed hard plates;

[0009] Each of the fixed hard plates is also provided with a second through hole, and the second through holes are arranged at the same horizontal height as the first through holes, and the two ends of the movable rod are respectively inserted into the second through holes of the two fixed hard plates; the movable rod and the fixed rod are horizontally parallel to each other at the same horizontal height; the support model is set on the movable rod and the fixed rod.

[0010] A plurality of partitions are arranged between the movable rod and the fixed rod, and the plurality of partitions are spaced apart along the direction of the movable rod and the fixed rod; one end of each of the two partitions is respectively in contact with the movable rod, and the other end of each of the two partitions is respectively groove-connected with the fixed rod, and the two partitions are respectively located between the movable rod and the fixed rod on both sides of the semi-cylindrical model;

[0011] The support model is composed of two semi-cylindrical models; each semi-cylindrical model is provided with a through hole, a fixed rod is passed through the through hole of one of the semi-cylindrical models, and a movable rod is passed through the through hole of the other semi-cylindrical model, and the two second semi-cylindrical models are formed by symmetrically dividing a cylinder through a longitudinal section.

[0012] The image capture and measurement device includes a ring light, a magnification adjustment knob, a main objective lens, a photographing eyepiece, a CCD camera, a support, a focusing handwheel, a signal transmission line, and a power line. The CCD camera lens faces downward, and the photographing eyepiece and the main objective lens are arranged in sequence at the lower end downward. The magnification adjustment knob is arranged circumferentially on the outer surface of the main objective lens. The main objective lens is threadedly connected to the magnification adjustment knob. The ring light is fixedly installed at the bottom of the main objective lens, and the support is connected to the photographing eyepiece via the focusing handwheel. One end of the signal output of the CCD camera is electrically connected to a PC end and a power supply via a signal transmission line and a power line, respectively.

[0013] The semi-cylindrical model is covered with a fabric mold, and the main objective lens of the image capturing and measuring device is placed vertically downwardly aligned with the gap between the two semi-cylindrical models.

[0014] The pressure testing device includes a pressure sensor, a sensor interface, a signal acquisition module and a signal transmission line; at least one pressure sensor is arranged on the outer circumference of the semi-cylindrical model of the auxiliary stretching device, one end of the signal acquisition module is provided with a sensor interface, the signal acquisition module is connected to the pressure sensor through the sensor interface, and the other end of the signal acquisition module is electrically connected to the PC end through the signal transmission line.

[0015] The device comprises a plurality of pressure sensors which are closely attached to the semi-cylindrical model, and sensing points of the pressure sensors are covered by fabrics.

[0016] The second through hole on the fixed hard plate is a strip-shaped through hole, and the moving rod moves laterally along the second through hole; and the through hole on the fixed hard plate and the through hole of the semi-cylindrical model are consistent in size.

[0017] The method comprises the following steps:

[0018] The first step is to mark the test points:

[0019] Mark the test points on the required test areas of the compression stockings;

[0020] The second step is to assemble the auxiliary device:

[0021] Select a support model of corresponding size according to the required test area of ​​the compression stockings, and place the two semi-cylindrical models in the support model on the fixed rod and the movable rod respectively;

[0022] Step 3: Connect the pressure test device:

[0023] Connect the pressure test device to the power supply and PC, calibrate the pressure sensor in the pressure test device without applying pressure manually, and attach the pressure sensor to the outer circumference of the two semi-cylinder models in the support model after calibration;

[0024] Step 4: Put on compression stockings:

[0025] Put the required test part of the compression stocking on the support model, so that the test point marked on the compression stocking coincides with the sensing end of the pressure sensor, and place a partition between the two semi-cylindrical models of the support model;

[0026] Step 5: Connect the image capture and measurement system:

[0027] Connect the image capture and measurement device to the PC via a data transmission cable. Adjust the brightness of the ring light in the image capture and measurement device. Place the scale ruler on the compression stocking. Turn the focus wheel of the image capture and measurement device to adjust the focal length of the eyepiece and main objective lens until the CCD camera can clearly capture the yarn coil structure of the compression stocking and the scale ruler scale.

[0028] Step 6: Image system unit calibration:

[0029] The microscopic image is collected by a CCD camera to calibrate the unit length and save it;

[0030] Step 7: Stress Test:

[0031] Start the pressure test, monitor the pressure data in real time through the pressure sensor, collect the microscopic image in real time through the CCD camera, observe the pressure data until the pressure data remains unchanged and reaches a stable state, then stop the test, and save the pressure data and microscopic image of the pressure test;

[0032] Step 8: Increase stretching:

[0033] According to different stretching amounts, spacers of different sizes are placed between the two semi-cylindrical models of the support model in order of size from small to large, so that the required test parts of the compression stockings are stretched to different degrees in sequence. After each stretching, return to step 4 and repeat the process;

[0034] Step 9: Change the test part:

[0035] For different test parts of the compression stockings, return to step 1 and repeat the process to record the microscopic images and pressure data of different test parts.

[0036] The fabric is a compression stocking; the required test areas of the compression stocking include the ankle, calf, and thigh, and semi-cylindrical models with corresponding radii of 3 cm, 4.5 cm, and 6 cm are selected in turn.

[0037] In the third step, at least two pressure sensors are provided, and the two pressure sensors are respectively located on the outer circumference surfaces of the two semi-cylinder models.

[0038] The beneficial effects of the present invention are as follows: The system for capturing and testing the coil structure of tubular stretch knitted fabrics is advantageous in that its combination of an auxiliary stretching device, an image capture and measurement system, a pressure testing system, and a PC allows for simultaneous testing of the fabric's pressure and coil structure under stretching conditions. The auxiliary stretching device is simple and easy to operate, with the mold, partitions, and rods involved being removable. Different mold sizes can be customized to meet the test sample's needs, and partitions of varying sizes can be replaced during the stretching process to achieve varying degrees of stretch.

[0039] The image capture and measurement system and the pressure test system are each connected to a PC, controlled by PC software. The image capture and measurement system's microscope clearly visualizes the fabric's coil structure and stores images on the PC. The pressure tester, with its thin, lightweight sensor, adheres snugly to the mold, ensuring sensitive and accurate test data. Multiple sensors can also be connected for simultaneous measurement. This testing method offers the advantage of simultaneously measuring the coil structure and corresponding pressure values ​​for tubular elastic knit fabrics. Custom molds of varying sizes and varying stretch levels can be customized, facilitating the measurement of the relationship between coil structure and corresponding pressure values ​​during stretching. The test process is simple, easy to use, and unaffected by external environmental interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the four parts of the present invention;

[0041] Figure 2 is a schematic diagram of the auxiliary stretching device;

[0042] Figure 3 Schematic diagram of two fixed hard board holes, movable rods and fixed rods;

[0043] Figure 4 It is a set of front and side views and internal perspective views of a semi-cylinder model;

[0044] Figure 5 is a schematic diagram of the position of the partition and the rod;

[0045] Figure 6 Schematic diagram of a partition inserted between two rods;

[0046] Figure 7 is a schematic diagram of a set of partitions;

[0047] Figure 8 A schematic diagram of the measurement system for image capture;

[0048] Figure 9 Schematic diagram of the positional relationship between the image capture and measurement system lens, the fabric, and the mold;

[0049] Figure 10 is a schematic diagram of the pressure test system;

[0050] Figure 11 Schematic diagram of the positional relationship between the pressure sensor, the fabric and the mold;

[0051] Figure 12 This is an image of the coil structure at the ankle.

[0052] Components shown in the figure: 1- auxiliary stretching device, 2- image capture and measurement device, 3- pressure testing device, 4- PC terminal, 5- semi-cylindrical model, 6- fixed bracket, 7- partition, 8- fixed hard plate, 9- moving rod, 10- fixed rod, 11- ring light, 12- magnification adjustment knob, 13- main objective lens, 14- photographic eyepiece, 15- CCD camera, 16- support, 17- focusing hand wheel, 18- signal transmission line, 19- power cord, 20- pressure sensor, 21- sensor interface, 22- signal acquisition module, 23- signal transmission line, 24- fabric mold, 25- first through hole, 26- second through hole. DETAILED DESCRIPTION

[0053] The following describes specific embodiments of the present invention with reference to the accompanying drawings to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0054] like Figure 1 As shown, the experimental device includes an auxiliary stretching device 1, an image capturing and measuring device 2, a pressure testing device 3 and a PC terminal 4; specifically, the image capturing and measuring device 2 is arranged above the auxiliary stretching device 1, the auxiliary stretching device 1 is electrically connected to the pressure testing device 3, and the image capturing and measuring device 2 and the pressure testing device 3 are respectively electrically connected to the PC terminal 4.

[0055] like Figure 2 and Figure 3 As shown, the auxiliary stretching device 1 includes a support model, a fixed bracket 6, a partition 7, a fixed hard plate 8, a movable rod 9 and a fixed rod 10; the two fixed hard plates 8 are arranged vertically relative to each other and spaced apart, and the two fixed hard plates 8 are fixedly connected by the fixed brackets 6 at the four corners. Each fixed hard plate 8 is respectively provided with a first through hole 25, and the two first through holes 25 are symmetrically arranged on the two fixed hard plates 8 in the middle between the two fixed hard plates 8, and the two ends of the fixed rod 10 are respectively inserted into the first through holes 25 of the two fixed hard plates 8;

[0056] Each fixed hard plate 8 is further provided with a second through hole 26. The two second through holes 26 are symmetrically arranged in the middle between the two fixed hard plates 8, and the second through holes 26 are arranged at the same level as the first through holes 25. The two ends of the movable rod 9 are respectively inserted into the second through holes 26 of the two fixed hard plates 8; the movable rod 9 and the fixed rod 10 are horizontally parallel to each other at the same level; Figure 4 As shown, the supporting model is arranged on a moving rod 9 and a fixed rod 10 .

[0057] like Figure 5As shown, a plurality of partitions 7 are arranged between the movable rod 9 and the fixed rod 10, and the plurality of partitions 7 are arranged at intervals along the direction of the movable rod 9 and the fixed rod 10;

[0058] One end of the two partitions 7 is respectively in contact with the moving rod 9, and the other end of the two partitions 7 is respectively groove-connected with the fixed rod 10, and the two partitions 7 are respectively located between the moving rod 9 and the fixed rod 10 on both sides of the semi-cylindrical model 5.

[0059] like Figure 4 As shown, the support model is composed of two semi-cylindrical models 5; each semi-cylindrical model 5 is provided with a through hole, the fixed rod 10 is passed through the through hole of one of the semi-cylindrical models 5, and the movable rod 9 is passed through the through hole of the other semi-cylindrical model 5, and the two second semi-cylindrical models 5 are formed by symmetrically dividing a cylinder through a longitudinal section.

[0060] like Figure 8 As shown, the image capture and measurement device 2 includes a ring light 11, a magnification adjustment knob 12, a main objective lens 13, an object lens 14, a CCD camera 15, a support 16, a focusing handwheel 17, a signal transmission line 18, and a power line 19. The CCD camera 15 has a downward-facing lens, and the object lens 14 and the main objective lens 13 are sequentially arranged at its lower end. The magnification adjustment knob 12 is circumferentially arranged on the outer surface of the main objective lens 13. The main objective lens 13 is threadedly connected to the magnification adjustment knob 12. The object lens 14 and the main objective lens 13 are focused by adjusting the magnification adjustment knob 12. The ring light 11 is fixedly mounted at the bottom of the main objective lens 13. The support 16 is connected to the object lens 14 via a focusing handwheel 17. The focusing handwheel can be used to adjust the height of the object lens 14 and the main objective lens 13, thereby adjusting the object distance between the object lens 14 and the main objective lens 13. The ring light illuminates the fabric downward, making the object image more clearly visible. A signal output end of the CCD camera 15 is electrically connected to the PC terminal 4 and a power supply through a signal transmission line 18 and a power line 19 respectively.

[0061] like Figure 9 As shown, the semi-cylindrical model 5 is covered with a fabric mold 24 , and the lens of the main objective lens 13 of the image capture and measurement device 2 is vertically aligned with the gap between the two semi-cylindrical models 5 and placed.

[0062] like Figure 10 As shown, the pressure testing device 3 includes a pressure sensor 20, a sensor interface 21, a signal acquisition module 22 and a signal transmission line 23; multiple pressure sensors 20 are arranged on the outer circumference of the semi-cylindrical model 5 of the auxiliary stretching device 1 to measure pressure data, and a sensor interface 21 is provided at one end of the signal acquisition module 22. The signal acquisition module 22 is connected to the pressure sensor 20 through an electric wire through the sensor interface 21, and the other end of the signal acquisition module 22 is electrically connected to the PC terminal 4 through the signal transmission line 23.

[0063] The image measurement storage device is equipped with measurement software that includes a ruler function. After focusing, a unit length can be marked with a ruler, and the data can be recorded and then an image can be recorded using the camera function.

[0064] like Figure 11 As shown, the pressure sensor 20 is thin, light, and flexible. During implementation, multiple pressure sensors 20 are selected for simultaneous testing. These sensors are placed snugly against the semi-cylindrical model 5, with their sensing points covered with fabric. A signal transmission line connects the image capture and measurement system and the pressure testing system, enabling software control, testing, and data storage.

[0065] The second through-hole 26 in the fixed plate 8 is a strip-shaped through-hole, along which the movable rod 9 can move laterally. The through-hole in the fixed plate 8 is the same size as the through-hole in the semi-cylindrical model 5. The semi-cylindrical model 5 and the partition 7 are smooth, hard, and non-deformable, made of stainless steel or acrylic. The size of the semi-cylindrical model 5 can be customized to the specific dimensions of a human body part, and the partition 7 is available in a variety of sizes, allowing for further adjustment of the model's spacing and circumference.

[0066] The auxiliary stretching device involved in the present invention needs to be low-cost, simple in structure, and easy to assemble and disassemble. Therefore, this implementation uses acrylic material to make the fixed hard plate, semi-cylindrical model and partition, and uses stainless steel material to make the fixed rod, movable rod and bracket.

[0067] The pressure testing system requires that the pressure sensor be thin and easy to operate. Multiple pressure sensors can be selected for simultaneous measurement. Currently, the most commonly used are resistive and airbag pressure testers. The flexible sensor in the resistive pressure tester is sensitive, compact, and as thin as paper. The testing principle is: when pressure is applied to the sensing area, a voltage change will occur at the output end of the sensor, and its signal will be amplified. It is then transmitted to the embedded hardware and converted by the A / D converter. Finally, the PC implements data storage. The sensor in the airbag pressure tester uses an airbag made of a polymer non-stretching material, and the thickness is usually less than 1mm, which is very thin and light. This implementation is carried out using a resistive pressure testing system.

[0068] In this embodiment, the experimental sample is a tubular elastic knitted fabric, and the test sample used is a size M compression sock.

[0069] It includes an auxiliary stretching device 1, an image capturing and measuring device 2, a pressure testing device 3 and a PC terminal 4; the image capturing and measuring device 2 is arranged above the auxiliary stretching device 1, the auxiliary stretching device 1 is electrically connected to the pressure testing device 3, and the image capturing and measuring device 2 and the pressure testing device 3 are electrically connected to the PC terminal 4 respectively;

[0070] The auxiliary stretching device 1 includes a support model, a fixed bracket 6, a partition 7, a fixed hard plate 8, a movable rod 9 and a fixed rod 10; the two fixed hard plates 8 are arranged vertically and spaced apart from each other, and the two fixed hard plates 8 are fixedly connected by the fixed brackets 6 at the four corners. Each fixed hard plate 8 is respectively provided with a first through hole 25, and the two ends of the fixed rod 10 are respectively inserted into the first through holes 25 of the two fixed hard plates 8;

[0071] Each fixed hard plate 8 is also provided with a second through hole 26, and the second through holes 26 are arranged at the same horizontal height as the first through holes 25, and the two ends of the movable rod 9 are respectively inserted into the second through holes 26 of the two fixed hard plates 8; the movable rod 9 and the fixed rod 10 are horizontally parallel to each other at the same horizontal height; the support model is set on the movable rod 9 and the fixed rod 10.

[0072] A plurality of partitions 7 are arranged between the movable rod 9 and the fixed rod 10, and the plurality of partitions 7 are spaced apart along the direction of the movable rod 9 and the fixed rod 10; one end of each of the two partitions 7 is respectively in contact with the movable rod 9, and the other end of each of the two partitions 7 is respectively groove-connected with the fixed rod 10, and the two partitions 7 are respectively located between the movable rod 9 and the fixed rod 10 on both sides of the semi-cylindrical model 5;

[0073] The supporting model is composed of two semi-cylindrical models 5; each semi-cylindrical model 5 is provided with a through hole, the fixed rod 10 is passed through the through hole of one of the semi-cylindrical models 5, the movable rod 9 is passed through the through hole of the other semi-cylindrical model 5, and the two second semi-cylindrical models 5 are formed by symmetrically dividing a cylinder through a longitudinal section.

[0074] The image capture and measurement device 2 includes a ring light 11, a magnification adjustment knob 12, a main objective lens 13, a photographic eyepiece 14, a CCD camera 15, a support 16, a focusing handwheel 17, a signal transmission line 18, and a power cord 19. The CCD camera 15 has a downward lens and the photographic eyepiece 14 and the main objective lens 13 are arranged in sequence at the lower end downward. The magnification adjustment knob 12 is arranged circumferentially on the outer surface of the main objective lens 13. The main objective lens 13 is threadedly connected to the magnification adjustment knob 12. The ring light 11 is fixedly installed at the bottom of the main objective lens 13. The support 16 is connected to the photographic eyepiece 14 via the focusing handwheel 17. The signal output end of the CCD camera 15 is electrically connected to the PC terminal 4 and the power supply via the signal transmission line 18 and the power cord 19, respectively.

[0075] The semi-cylindrical model 5 is covered with a fabric mold 24 , and the main objective lens 13 of the image capturing and measuring device 2 is placed with the lens facing downward and vertically aligned with the gap between the two semi-cylindrical models 5 .

[0076] The pressure testing device 3 includes a pressure sensor 20, a sensor interface 21, a signal acquisition module 22 and a signal transmission line 23; at least one pressure sensor 20 is arranged on the outer circumference of the semi-cylindrical model 5 of the auxiliary stretching device 1, and a sensor interface 21 is provided at one end of the signal acquisition module 22. The signal acquisition module 22 is connected to the pressure sensor 20 through the sensor interface 21, and the other end of the signal acquisition module 22 is electrically connected to the PC terminal 4 through the signal transmission line 23.

[0077] It includes a plurality of pressure sensors 20 , which are closely attached to the semi-cylindrical model 5 , and the sensing points of the pressure sensors 20 are covered by fabric.

[0078] The second through hole 26 on the fixed hard plate 8 is a strip-shaped through hole, and the moving rod 9 moves laterally along the second through hole 26 ; and the through hole on the fixed hard plate 8 and the through hole of the semi-cylindrical model 5 are consistent in size.

[0079] The method comprises the following steps:

[0080] The first step is to mark the test points:

[0081] Mark the test points on the required test areas of the compression stockings;

[0082] The second step is to assemble the auxiliary device:

[0083] Select a support model of corresponding size according to the required test area of ​​the compression stockings, and place the two semi-cylindrical models in the support model on the fixed rod and the movable rod respectively;

[0084] Step 3: Connect the pressure test device:

[0085] Connect the pressure test device 3 to the power supply and PC, calibrate the pressure sensor 20 in the pressure test device 3 without applying pressure manually, and after calibration, attach the pressure sensor 20 to the outer circumference of the two semi-cylinder models in the support model respectively;

[0086] Step 4: Put on compression stockings:

[0087] Put the required test part of the compression stocking on the support model, so that the test point marked on the compression stocking coincides with the sensing end of the pressure sensor, and place a partition between the two semi-cylindrical models of the support model;

[0088] Step 5: Connect the image capture and measurement system:

[0089] Connect the image capture and measurement device to the PC via a data transmission line, adjust the brightness of the ring light 11 in the image capture and measurement device 2, place the scale ruler on the compression stocking, and turn the focus hand wheel 17 of the image capture and measurement device 2 to adjust the focal length of the object-capturing eyepiece 14 and the main objective lens 13 until the CCD camera 15 can clearly capture the yarn coil structure of the compression stocking and the scale ruler scale.

[0090] Step 6: Image system unit calibration:

[0091] The microscopic image is collected by the CCD camera 15 to calibrate the unit length and save it;

[0092] Step 7: Stress Test:

[0093] Start the pressure test, monitor the pressure data in real time through the pressure sensor 20, collect the microscopic image in real time through the CCD camera 15, observe the pressure data until the pressure data remains unchanged and reaches a stable state, then stop the test, and save the pressure data and microscopic image of the pressure test;

[0094] Step 8: Increase stretching:

[0095] According to different stretching amounts, spacers of different sizes are placed between the two semi-cylindrical models of the support model in order of size from small to large, so that the required test parts of the compression stockings are stretched to different degrees in sequence. After each stretching, return to step 4 and repeat the process;

[0096] Step 9: Change the test part:

[0097] For different test parts of the compression stockings, return to step 1 and repeat the process to record the microscopic images and pressure data of different test parts.

[0098] The fabric is for compression stockings; the required test areas of the compression stockings include the ankle, calf, and thigh, and semi-cylindrical models with corresponding radii of 3 cm, 4.5 cm, and 6 cm are selected in turn.

[0099] In the third step, at least two pressure sensors 20 are provided. The two pressure sensors 20 are respectively located on the outer circumferences of the two semi-cylinder models.

[0100] Table 1 Pressure value test data table (unit: kpa)

[0101] .

Claims

1. A system for photographing and testing the wearing pressure of a tubular elastic knitted fabric coil structure, characterized by: The apparatus comprises an auxiliary stretching device (1), an image capturing and measuring device (2), a pressure testing device (3) and a PC terminal (4); the image capturing and measuring device (2) is arranged above the auxiliary stretching device (1), the auxiliary stretching device (1) is electrically connected to the pressure testing device (3), and the image capturing and measuring device (2) and the pressure testing device (3) are both electrically connected to the PC terminal (4); The auxiliary stretching device (1) comprises a supporting model, a fixed bracket (6), a partition (7), a fixed hard plate (8), a movable rod (9) and a fixed rod (10); two fixed hard plates (8) are arranged vertically and spaced apart from each other, and the two fixed hard plates (8) are fixedly connected via fixed brackets (6) at four corners; each of the fixed hard plates (8) is provided with a first through hole (25), and both ends of the fixed rod (10) are respectively inserted into the first through holes (25) of the two fixed hard plates (8); Each of the fixed hard plates (8) is also provided with a second through hole (26), and the second through holes (26) are arranged at the same level as the first through holes (25), and both ends of the movable rod (9) are respectively inserted into the second through holes (26) of the two fixed hard plates (8); the movable rod (9) and the fixed rod (10) are horizontally parallel to each other at the same level; the support model is arranged on the movable rod (9) and the fixed rod (10); A plurality of partitions (7) are arranged between the movable rod (9) and the fixed rod (10), and the plurality of partitions (7) are spaced apart along the direction of the movable rod (9) and the fixed rod (10); one end of each of the two partitions (7) is respectively in contact with and connected to the movable rod (9), and the other end of each of the two partitions (7) is respectively groove-connected to the fixed rod (10), and the two partitions (7) are respectively located between the movable rod (9) and the fixed rod (10) on both sides of the semi-cylindrical model (5); The support model is composed of two semi-cylindrical models (5); each of the semi-cylindrical models (5) is provided with a through hole, a fixed rod (10) is passed through the through hole of one of the semi-cylindrical models (5), and a movable rod (9) is passed through the through hole of the other semi-cylindrical model (5), and the two semi-cylindrical models (5) are formed by symmetrically dividing a cylinder through a longitudinal section.

2. The system for photographing and wearing pressure testing a tubular elastic knitted fabric coil structure according to claim 1, characterized in that: The image capturing and measuring device (2) comprises a ring light (11), a magnification adjustment knob (12), a main objective lens (13), a photographing eyepiece (14), a CCD camera (15), a support (16), a focusing hand wheel (17), a first signal transmission line (18) and a power line (19); the lens of the CCD camera (15) faces downward, and the photographing eyepiece (14) and the main objective lens (13) are arranged in sequence at the lower end downward, a magnification adjustment knob (12) is arranged circumferentially on the outer surface of the main objective lens (13), the main objective lens (13) and the magnification adjustment knob (12) are threadedly connected, a ring light (11) is fixedly installed at the bottom of the main objective lens (13), and the support (16) is connected to the photographing eyepiece (14) via the focusing hand wheel (17); a signal output end of the CCD camera (15) is electrically connected to the PC end (4) and the power supply via the first signal transmission line (18) and the power line (19), respectively.

3. The system for photographing and wearing pressure testing a tubular elastic knitted fabric coil structure according to claim 1, characterized in that: The semi-cylindrical model (5) is provided with a fabric mold (24), and the main objective lens (13) of the image capturing and measuring device (2) is placed with the lens facing downward and vertically aligned with the gap between the two semi-cylindrical models (5).

4. The system for photographing and wearing pressure testing a tubular elastic knitted fabric coil structure according to claim 1, characterized in that: The pressure testing device (3) comprises a pressure sensor (20), a sensor interface (21), a signal acquisition module (22) and a second signal transmission line (23); at least one pressure sensor (20) is arranged on the outer circumference of the semi-cylindrical model (5) of the auxiliary stretching device (1); one end of the signal acquisition module (22) is provided with a sensor interface (21); the signal acquisition module (22) is connected to the pressure sensor (20) via the sensor interface (21); and the other end of the signal acquisition module (22) is electrically connected to the PC end (4) via the second signal transmission line (23).

5. The system for photographing and wearing pressure testing a tubular elastic knitted fabric coil structure according to claim 4, characterized in that: The device comprises a plurality of pressure sensors (20), wherein the plurality of pressure sensors (20) are closely attached to the semi-cylindrical model (5), and the sensing points of the pressure sensors (20) are covered by fabric.

6. The system for photographing and wearing pressure testing a tubular elastic knitted fabric coil structure according to claim 1, characterized in that: The second through hole (26) on the fixed hard plate (8) is a strip-shaped through hole, and the moving rod (9) moves laterally along the second through hole (26); and the through hole on the fixed hard plate (8) and the through hole of the semi-cylindrical model (5) are of the same size.

7. A method for photographing the coil structure of a tubular elastic knitted fabric and testing wearing pressure, applied to the system of any one of claims 1 to 6, characterized in that: The method comprises the following steps: The first step is to mark the test points: Mark the test points on the required test areas of the compression stockings; The second step is to assemble the auxiliary device: Select a support model of corresponding size according to the required test area of ​​the compression stockings, and place the two semi-cylindrical models in the support model on the fixed rod and the movable rod respectively; Step 3: Connect the pressure test device: Connecting the pressure test device (3) to a power source and a PC terminal, calibrating the pressure sensor (20) in the pressure test device (3) without applying pressure manually, and after calibration, attaching the pressure sensor (20) to the outer circumferences of the two semi-cylindrical models in the support model respectively; Step 4: Put on compression stockings: Put the required test part of the compression stocking on the support model, so that the test point marked on the compression stocking coincides with the sensing end of the pressure sensor, and place a partition between the two semi-cylindrical models of the support model; Step 5: Connect the image capture and measurement system: Connect the image capturing and measuring device to the PC via a data transmission line, adjust the brightness of the ring light (11) in the image capturing and measuring device (2), place the scale ruler on the compression stocking, turn the focusing hand wheel (17) of the image capturing and measuring device (2) to adjust the focal length of the object eyepiece (14) and the main objective lens (13), and adjust it until the CCD camera (15) can clearly capture the yarn coil structure of the compression stocking and the scale ruler scale; Step 6: Image system unit calibration: The microscopic image is collected by a CCD camera (15) to calibrate the unit length and save it; Step 7: Stress Test: Starting a pressure test, monitoring pressure data in real time through a pressure sensor (20), acquiring a microscopic image in real time through a CCD camera (15), observing the pressure data until the pressure data remains constant and reaches a stable state, then stopping the test, and saving the pressure data and microscopic image of the pressure test; Step 8: Increase stretching: According to different stretching amounts, spacers of different sizes are placed between the two semi-cylindrical models of the support model in order of size from small to large, so that the required test parts of the compression stockings are stretched to different degrees in sequence. After each stretching, return to step 4 and repeat the process; Step 9: Change the test part: For different test parts of the compression stockings, return to step 1 and repeat the process to record the microscopic images and pressure data of different test parts.

8. The system for photographing and wearing pressure testing a tubular elastic knitted fabric coil structure according to claim 7, characterized in that: The fabric is a compression stocking; the required test areas of the compression stocking include the ankle, calf, and thigh, and semi-cylindrical models with corresponding radii of 3 cm, 4.5 cm, and 6 cm are selected in turn.

9. The system for photographing and wearing pressure testing a tubular elastic knitted fabric coil structure according to claim 7, characterized in that: In the third step, at least two pressure sensors (20) are provided, and the two pressure sensors (20) are respectively located on the outer circumferential surfaces of the two semi-cylindrical models.

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