An online detection and control system and method for fabric density and shrinkage

Abstract

The present invention discloses an online detection and control system and method for fabric density and shrinkage, comprising a pre-shrinkage device, a first detection device, a second detection device, a calculation unit, a control unit, and a safety detection device. The present invention can detect the weft density and weft shrinkage of the fabric before and after processing in real time online, and can adjust and control the actuator of the pre-shrinkage device in real time according to a preset weft density or weft shrinkage, so that the processed fabric can meet the production process requirements. The present invention has a simple structure, high processing efficiency, and a high degree of automation.

Description

[Technical field]

[0001] The present invention relates to the textile processing industry, and in particular to an online detection and control system and method for fabric density and shrinkage. [Background Technology]

[0002] In the textile processing industry, density and shrinkage are crucial fabric processing parameters. Shrinkage can be calculated from density. Fabrics are often processed using shrinking machines, setting machines, and other pre-shrinking equipment to ensure that the finished fabric's density or shrinkage meets pre-set requirements. Uneven density can occur before processing, resulting in uneven weight. After processing, uniform density is achieved to meet subsequent production requirements. Too little shrinkage can easily lead to deformation; too much shrinkage can result in significant waste and require rework, impacting production efficiency and increasing costs.

[0003] Currently, the main method for detecting fabric density is manual operation. Manual dot sampling is performed at the fabric input end of the pre-shrinking equipment or a density microscope is used to measure the density of the fabric before processing. Manual dot sampling is performed at the fabric output end of the pre-shrinking equipment or a density microscope is used to measure the density of the fabric after processing. The density is converted into shrinkage rate. Then, according to the difference between the measured density or shrinkage rate and the preset density or shrinkage rate, the operating parameters of each actuator of the pre-shrinking equipment are manually adjusted to make the density or shrinkage rate of the processed fabric meet the preset requirements. The current fabric processing has the following disadvantages:

[0004] 1. Manual dot sampling or density microscope measurement methods have large artificial errors, making the measured density or shrinkage of the fabric inaccurate and inefficient;

[0005] 2. It can only take samples at intervals and cannot continuously measure the fabric in real time. The density or shrinkage of the fabric measured cannot fully reflect the density or shrinkage of each area in the fabric.

[0006] 3. After manually measuring the density or shrinkage of the fabric, the operating parameters of each actuator of the pre-shrinking equipment are manually adjusted. This heavily relies on the operator's experience to control. The adjustment is not accurate and timely, and the efficiency is low, and the degree of automation is low.

[0007] The present invention is produced based on the above problems. [Summary of the invention]

[0008] The purpose of the present invention is to address the deficiencies in the prior art and propose an online detection and control system and method for fabric density and shrinkage. The present invention can continuously detect the density and shrinkage of the fabric before and after processing in real time. The measured density and shrinkage are accurate and reliable, and the operating parameters of each actuator of the pre-shrinkage equipment can be adjusted in real time according to the preset density or shrinkage. The fabric density and shrinkage online detection and control system of the present invention has a simple structure, and the fabric density and shrinkage online detection and control method of the present invention has high efficiency and a high degree of automation, meeting the process requirements of fabric processing.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0010] A fabric density and shrinkage online detection and control system includes a pre-shrinking device for processing fabric to obtain finished fabric that meets preset density or shrinkage requirements. The pre-shrinking device is provided with a first detection device and a second detection device for online real-time fabric image capture on a side close to the fabric input end and a side close to the fabric output end, respectively. The pre-shrinking device is also provided with:

[0011] A calculation unit, configured to receive the image data from the first detection device and the second detection device and calculate and process the image data to obtain weft density data or weft shrinkage data of the fabric;

[0012] a safety detection device for detecting the conveying state of the fabric in the preshrinking device;

[0013] A control unit is used to receive the weft density data or weft shrinkage data obtained by the calculation unit and compare them with the preset weft density or weft shrinkage respectively, and to control the actuator of the pre-shrinkage device in real time to make adjustments according to the comparison results so that the weft density or weft shrinkage of the processed fabric meets the preset requirements.

[0014] The actuator includes a centering mechanism, an overfeeding mechanism, a rubber blanket mechanism, a roller mechanism, a heating mechanism, and a felt blanket mechanism, which are arranged in sequence along the conveying direction of the fabric. The first detection device is located between the fabric input end of the pre-shrinking device and the rubber blanket mechanism. The second detection device is located between the outlet of the felt blanket mechanism and the fabric output end of the pre-shrinking device. The safety detection device is located between the rubber blanket mechanism and the felt blanket mechanism.

[0015] The pre-shrinkage equipment is respectively provided with a third detection device and a fourth detection device for online real-time shooting of fabric images on one side close to the fabric input end and on the other side close to the fabric output end. The calculation unit is electrically connected to the third detection device and the fourth detection device respectively. The calculation unit receives the image data of the third detection device and the fourth detection device and calculates and processes the image data to obtain the width data or warp shrinkage data of the fabric. The control unit receives the width data or warp shrinkage data obtained by the calculation unit and compares it with the preset width or warp shrinkage. The control unit controls the actuator of the pre-shrinkage equipment in real time according to the comparison result to make adjustments so that the width or warp shrinkage of the processed fabric meets the preset requirements.

[0016] The pre-shrinkage device is respectively provided with a first tension device and a second tension device for detecting and controlling the size of the fabric tension on one side close to the fabric input end and the other side close to the fabric output end. The first tension device includes a first tension detection device for detecting the size of the fabric tension. The first tension device also includes a first tension control mechanism that cooperates with the centering mechanism or the overfeeding mechanism to adjust and control the size of the fabric tension. An active roller and a fabric swing mechanism are sequentially provided between the second tension device and the fabric output end of the pre-shrinkage device along the conveying direction of the fabric. The second tension device includes a second tension detection device for detecting the size of the fabric tension. The second tension device also includes a second tension control mechanism that cooperates with the active roller and the fabric swing mechanism to adjust and control the size of the fabric tension.

[0017] The first detection device or the second detection device includes an image acquisition device and a light source board cooperating with the image acquisition device. The light source board includes a panel and a slide rail. The slide rail is connected to a sliding seat that can slide relative to it. Rotating columns rotatably connected to the sliding seat are provided on opposite sides of the panel, and a light source is provided on the panel.

[0018] The safety detection device is located between the rubber blanket mechanism and the felt blanket mechanism. The safety detection device is a distance sensor for measuring the distance between the fabric and the rubber blanket mechanism, or the safety detection device is a tension detection device for measuring the tension of the fabric.

[0019] A method for online detection and control of fabric density and shrinkage, comprising the following steps:

[0020] Step A: The first detection device photographs the fabric before processing to obtain first image data, the pre-shrinking device performs pre-shrinking processing on the fabric, and the second detection device photographs the fabric after processing to obtain second image data;

[0021] Step B: The calculation unit performs image processing on the first image data and the second image data to calculate the first weft density D1 of the fabric before processing and the second weft density D2 after processing. The calculation unit calculates the weft shrinkage rate of the fabric in the current camera area after processing by the pre-shrinking device based on the first weft density D1 and the second weft density D2.

[0022] Step C: Repeating steps A and B while the fabric is being conveyed forward, to achieve online real-time detection of the first weft density D1, the second weft density D2, and the weft shrinkage S1 of the fabric;

[0023] Step D: If the second weft density D2 is to be controlled to be equal to the preset weft density D0, the control unit pre-increases the pressure of the rubber blanket mechanism to increase D2. When D2 is greater than D0, the control unit maintains the pressure of the rubber blanket mechanism unchanged and increases the operating speed of the blanket mechanism to reduce D2. When D2 is equal to D0, the control unit maintains the operating speed of the blanket mechanism unchanged. When D2 is less than D0 and the operating speed of the blanket mechanism is not less than a preset safety threshold, the control unit reduces the operating speed of the blanket mechanism. When D2 is less than D0 and the operating speed of the blanket mechanism is less than the preset safety threshold, the control unit maintains the operating speed of the blanket mechanism above the preset safety threshold and increases the pressure of the rubber blanket mechanism or reduces the operating speed of the overfeed mechanism. If the weft shrinkage S1 is to be controlled to be equal to the preset weft shrinkage S0, when S1 is less than S0, the control unit increases the pressure of the rubber blanket mechanism to increase S1. When S1 is equal to S0, the control unit maintains the pressure of the rubber blanket mechanism unchanged and maintains the speed ratio of the overfeed mechanism to the blanket mechanism unchanged. When S1 is greater than S0, the control unit reduces the pressure of the rubber blanket mechanism.

[0024] The above-mentioned method for online detection and control of fabric density and shrinkage can be used to perform online real-time detection and control of the weft density D and weft shrinkage S of the fabric, and may further include the following steps:

[0025] In step A, the first tension detection device detects the tension of the fabric before processing in real time, and the second tension detection device detects the tension of the fabric after processing in real time;

[0026] In step D, when the tension detected by the first tension detection device is greater than a preset value, the control unit controls the first tension control mechanism and the overfeed mechanism or the centering mechanism to accelerate synchronously; when the tension detected by the first tension detection device is less than the preset value, the control unit controls the first tension control mechanism and the overfeed mechanism or the centering mechanism to decelerate synchronously; when the tension detected by the first tension detection device is equal to the preset value, the control unit maintains the operating speeds of the first tension control mechanism and the overfeed mechanism or the centering mechanism unchanged; when the tension detected by the second tension detection device is greater than the preset value, the control unit controls the second tension control mechanism, the active roller, and the fabric swinging mechanism to accelerate synchronously; when the tension detected by the second tension detection device is less than the preset value, the control unit controls the second tension control mechanism, the active roller, and the fabric swinging mechanism to decelerate synchronously; when the tension detected by the second tension detection device is equal to the preset value, the control unit maintains the operating speeds of the second tension control mechanism, the active roller, and the fabric swinging mechanism unchanged.

[0027] Another method for online detection and control of fabric density and shrinkage includes the following steps:

[0028] Step A: The third detection device photographs the fabric before processing to obtain third image data, the pre-shrinking device performs pre-shrinking processing on the fabric, and the fourth detection device photographs the fabric after processing to obtain fourth image data;

[0029] Step B: The calculation unit performs image processing on the third image data and the fourth image data to calculate the first width W1 of the fabric before processing and the second width W2 of the fabric after processing. The calculation unit calculates the radial shrinkage rate of the fabric in the current camera area after processing by the pre-shrinking device based on the first width W1 and the second width W2.

[0030] Step C: Repeating steps A and B while the fabric is being conveyed forward, to achieve online real-time detection of the first width W1, the second width W2, and the radial shrinkage F1 of the fabric;

[0031] Step D: If the second width W2 is to be controlled to be equal to the preset width W0 or the radial shrinkage F1 is to be equal to the preset warp shrinkage F0, when W2 is greater than W0 or F1 is greater than F0, the control unit reduces the operating speed of the overfeed mechanism; when W2 is less than W0 or F1 is less than F0, the control unit increases the operating speed of the overfeed mechanism; when W2 is equal to W0 or F1 is equal to F0, the control unit maintains the operating speed of the overfeed mechanism unchanged.

[0032] The above-mentioned method for online detection and control of fabric density and shrinkage can be used to perform online real-time detection and control of fabric width W and radial shrinkage F, and may further include the following steps:

[0033] In step A, the first tension detection device detects the tension of the fabric before processing in real time, and the second tension detection device detects the tension of the fabric after processing in real time;

[0034] In step D, when the tension detected by the first tension detection device is greater than a preset value, the control unit controls the first tension control mechanism and the overfeed mechanism or the centering mechanism to accelerate synchronously; when the tension detected by the first tension detection device is less than the preset value, the control unit controls the first tension control mechanism and the overfeed mechanism or the centering mechanism to decelerate synchronously; when the tension detected by the first tension detection device is equal to the preset value, the control unit maintains the operating speeds of the first tension control mechanism and the overfeed mechanism or the centering mechanism unchanged; when the tension detected by the second tension detection device is greater than the preset value, the control unit controls the second tension control mechanism, the active roller, and the fabric swinging mechanism to accelerate synchronously; when the tension detected by the second tension detection device is less than the preset value, the control unit controls the second tension control mechanism, the active roller, and the fabric swinging mechanism to decelerate synchronously; when the tension detected by the second tension detection device is equal to the preset value, the control unit maintains the operating speeds of the second tension control mechanism, the active roller, and the fabric swinging mechanism unchanged.

[0035] The beneficial effects of the present invention are:

[0036] 1. The present invention can detect the weft density and weft shrinkage of the fabric before and after processing in real time online, and can adjust and control the actuator of the pre-shrinkage equipment in real time according to the preset weft density or weft shrinkage, so that the processed fabric can meet the production process requirements. It has a simple structure, high processing efficiency and high degree of automation.

[0037] 2. The present invention can also detect the width and radial shrinkage of the fabric before and after processing in real time online, and can adjust and control the actuator of the pre-shrinkage equipment in real time according to the preset width or radial shrinkage, so that the processed fabric can meet the production process requirements, with a simpler structure, higher processing efficiency and a higher degree of automation.

[0038] 3. The present invention can detect the tension of fabrics with high elasticity in real time during the transportation process, and can adjust the actuator of the pre-shrinkage equipment in real time according to the preset tension stability requirements. It has a simpler structure, higher processing efficiency and higher degree of automation. [Brief Description of the Drawings]

[0039] Figure 1 It is a structural diagram of embodiment 1 of the present invention;

[0040] Figure 2 is a structural diagram of embodiment 2 of the present invention;

[0041] Figure 3is a structural diagram of embodiment 3 of the present invention;

[0042] Figure 4 It is a structural diagram of the light source board;

[0043] Figure 5 yes Figure 4 Schematic diagram of the structural decomposition. [Specific implementation method]

[0044] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] like Figures 1 to 3 As shown, an online detection and control system for fabric density and shrinkage includes a pre-shrinking device 1 for processing a fabric 4 to obtain a finished fabric that meets preset density or shrinkage requirements. The pre-shrinking device 1 is provided with a first detection device 21 and a second detection device 22 for online real-time capture of the fabric 4 near the fabric input end and the fabric output end, respectively. The pre-shrinking device 1 is also provided with:

[0047] A calculation unit 6 is configured to receive image data from the first detection device 21 and the second detection device 22 and calculate and process the image data to obtain weft density data or weft shrinkage data of the fabric 4;

[0048] A safety detection device 20 for detecting the conveying state of the fabric 4 in the preshrinking device 1;

[0049] The control unit 7 is used to receive the weft density data or weft shrinkage data obtained by the calculation unit 6 and compare them with the preset weft density or weft shrinkage, and to control the actuator of the pre-shrinkage device 1 to make adjustments in real time according to the comparison results so that the weft density or weft shrinkage of the processed fabric 4 meets the preset requirements.

[0050] In the first embodiment, after the positions of the first detection device 21 and the second detection device 22 are fixed on the preset device 1, the distance between the two along the conveying path of the fabric 4 can be determined. When the same area of ​​the fabric 4 reaches the first detection device 21 and the second detection device 22 successively, the first detection device 21 and the second detection device 22 respectively shoot the area to obtain image data of the area before processing and image data after processing. After calculation and processing by the calculation unit 6, the weft density of the area before processing, the weft density after processing and the weft shrinkage can be obtained. Since the fabric 4 is conveyed during the process, the weft density of the area before processing, the weft density after processing and the weft shrinkage can be obtained. The first detection device 21 and the second detection device 22 have been shooting in real time, and the calculation unit 6 has been calculating and processing image data and saving the weft density of each area of ​​the fabric 4 before processing, the weft density after processing, and the weft shrinkage for use by the control unit 7. The control unit 7 adjusts and controls the various actuators of the pre-shrinkage device 1 according to the difference between the weft density and weft shrinkage of the current area of ​​the fabric 4 after processing and the preset weft density and weft shrinkage, so that the weft density and weft shrinkage of the subsequent area of ​​the fabric 4 to be processed after processing meet the preset requirements. The structure is simple, the processing efficiency is high, and the degree of automation is high.

[0051] The actuator includes a centering mechanism 11, an overfeeding mechanism 12, a rubber blanket mechanism 13, a roller mechanism 14, a heating mechanism 15, and a felt blanket mechanism 16, which are arranged in sequence along the conveying direction of the fabric 4. The first detection device 21 is located between the fabric input end of the pre-shrinking device 1 and the rubber blanket mechanism 13, so that the measured weft density of the fabric 4 before processing is more accurate and reliable. The second detection device 22 is located between the outlet of the felt blanket mechanism 16 and the fabric output end of the pre-shrinking device 1, so that the measured weft density of the fabric 4 after processing is more accurate and reliable, and the weft shrinkage rate calculated from the weft density is more real and accurate. The safety detection device 20 is located between the rubber blanket mechanism 13 and the felt blanket mechanism 16.

[0052] The pre-shrinking equipment 1 is respectively provided with a third detection device 23 and a fourth detection device 24 for online real-time shooting of the fabric 4 image on the side close to the fabric input end and the side close to the fabric output end. The calculation unit 6 is electrically connected to the third detection device 23 and the fourth detection device 24 respectively. The calculation unit 6 receives the image data of the third detection device 23 and the fourth detection device 24 and calculates and processes to obtain the width data or warp shrinkage data of the fabric 4. The control unit 7 receives the width data or warp shrinkage data obtained by the calculation unit 6 and compares it with the preset width or warp shrinkage. The control unit 7 controls the actuator of the pre-shrinking equipment 1 in real time according to the comparison result to make adjustments so that the width or warp shrinkage of the processed fabric 4 meets the preset requirements.

[0053] In Example 2, the third detection device 23 is located between the fabric input end of the pre-shrinking equipment 1 and the rubber blanket mechanism 13 and is close to the first detection device 21, so that the measured width of the fabric 4 before processing is more accurate and reliable. The fourth detection device 24 is located between the outlet of the blanket mechanism 16 and the fabric output end of the pre-shrinking equipment 1 and is close to the second detection device 22, so that the measured width of the fabric 4 after processing is more accurate and reliable, and the radial shrinkage calculated from the width is more real and accurate. After the third and fourth detection devices 23 and 24 are fixed in position on the preset device 1, the distance between them along the conveying path of the fabric 4 can be determined. When the same area of ​​the fabric 4 reaches the third and fourth detection devices 23 and 24 respectively, the third and fourth detection devices 23 and 24 respectively capture the area to obtain image data of the area before and after processing. After calculation and processing by the calculation unit 6, the width of the area before and after processing, as well as the warp shrinkage, can be obtained. Because the third and fourth detection devices 23 and 24 are constantly capturing images in real time during the conveyance of the fabric 4, the calculation unit 6 continuously calculates and processes the image data and stores the width of each area of ​​the fabric 4 before and after processing, as well as the warp shrinkage, for use by the control unit 7. The control unit 7 adjusts the various actuators of the pre-shrinking device 1 based on the difference between the width and warp shrinkage of the current area of ​​the fabric 4 after processing and the preset width and warp shrinkage, so that the width and warp shrinkage of the subsequent area of ​​the fabric 4 to be processed meet the preset requirements. This results in a simpler structure, higher processing efficiency, and a higher degree of automation.

[0054] The pre-shrinking equipment 1 is respectively provided with a first tension device 31 and a second tension device 32 for detecting and controlling the tension of the fabric 4 on the side close to the fabric input end and the side close to the fabric output end. The first tension device 31 includes a first tension detection device 311 for detecting the tension of the fabric 4. The first tension device 31 also includes a first tension control mechanism 312 that cooperates with the centering mechanism 11 or the overfeeding mechanism 12 to adjust and control the tension of the fabric 4. An active roller 17 and a fabric swing mechanism 18 are sequentially provided between the second tension device 32 and the fabric output end of the pre-shrinking equipment 1 along the conveying direction of the fabric 4. The second tension device 32 includes a second tension detection device 321 for detecting the tension of the fabric 4. The second tension device 32 also includes a second tension control mechanism 322 that cooperates with the active roller 17 and the fabric swing mechanism 18 to adjust and control the tension of the fabric 4.

[0055] In the third embodiment, the first tensioning device 31 is located between the fabric input end of the pre-shrinking apparatus 1 and the rubber blanket mechanism 13, near the first detection device 21. The second tensioning device 32 is located between the outlet of the blanket mechanism 16 and the fabric output end of the pre-shrinking apparatus 1, near the second detection device 22. The first tension detecting device 311 or the second tension detecting device 321 can be a distance sensor, such as a laser sensor or an ultrasonic sensor, or a mechanical device with a smooth-surfaced rod that relies on gravity detection, or a device with a tension rod. The first tension control mechanism 312 or the second tension control mechanism 322 includes a conveyor roller and a conveyor belt that cooperates with the conveyor roller. The conveyor belt can be fully transparent or intermittently transparent. The conveyor belt is used to carry and transport a fabric 4 with high elasticity. The conveyor roller drives the conveyor belt so that the conveying speed of the conveyor belt is synchronized with the conveying speed of the fabric 4. The present invention can detect the tension of the fabric 4 with high elasticity in real time during transportation and adjust the actuator of the pre-shrinking apparatus 1 in real time according to the preset tension stability requirements. This results in a simpler structure, higher processing efficiency, and a higher degree of automation.

[0056] like Figure 4 and Figure 5 As shown, the first detection device 21 or the second detection device 22 includes an image acquisition device and a light source board 8 cooperating with the image acquisition device. The light source board 8 includes a panel 81 and a slide rail 82. The slide rail 82 is connected to a sliding seat 83 that can slide relative to it. The opposite sides of the panel 81 are provided with rotating columns 84 rotatably connected to the sliding seat 83. The panel 81 is provided with a light source 85.

[0057] The third detection device 23 or the fourth detection device 24 also includes an image acquisition device and a light source board 8 that cooperates with the image acquisition device. When the light source 85 is a backlight source, the light source board 8 and the camera are respectively located on both sides of the fabric 4; when the light source 85 is a main light source, the light source board 8 and the camera are located on the same side of the fabric 4. The light source 85 can be a single light source, several light sources arranged in parallel, or a long strip of light source. The light source board 8 can be adjusted in multiple directions to make the image captured by the image acquisition device clearer and more reliable. The image acquisition device can be an industrial camera or a camera. An electric fan 86 can be connected to the panel 81 to dissipate heat from the light source 85.

[0058] The safety detection device 20 is located between the rubber blanket mechanism 13 and the felt blanket mechanism 16 . The safety detection device 20 is a distance sensor for measuring the distance between the fabric 4 and the rubber blanket mechanism 13 , or a tension detection device for measuring the tension of the fabric 4 .

[0059] The distance sensor may be a laser sensor or an ultrasonic sensor, and the tension detection device may be a mechanical device with a smooth rod that relies on gravity detection, or a device with a tension rod. The safety detection device 20 can monitor the conveying status of the fabric 4 within the preshrinking apparatus 1 in real time, preventing the fabric 4 from being excessively stretched due to the excessive speed of the felt mechanism 16, and preventing the fabric 4 from sagging and contacting the ground due to the excessive speed of the rubber blanket mechanism 13.

[0060] The display screen 5 is located on the fabric output side of the pre-shrinking device 1 and is used to display the measured weft density data, weft shrinkage data, width data, warp shrinkage data, and operating parameters of each actuator of the pre-shrinking device 1 in real time.

[0061] A method for online detection and control of fabric density and shrinkage, comprising the following steps:

[0062] Step A: The first detection device 21 photographs the fabric 4 before processing to obtain first image data, the pre-shrinking device 1 performs pre-shrinking processing on the fabric 4, and the second detection device 22 photographs the fabric 4 after processing to obtain second image data;

[0063] Step B: The calculation unit 6 performs image processing on the first image data and the second image data to calculate the first weft density D1 of the fabric 4 before processing and the second weft density D2 after processing. The calculation unit 6 calculates the weft shrinkage rate of the fabric 4 in the current camera area after processing by the pre-shrinking device 1 based on the first weft density D1 and the second weft density D2.

[0064] Step C: Repeating steps A and B while the fabric 4 is being conveyed forward, to achieve online real-time detection of the first weft density D1, the second weft density D2, and the weft shrinkage S1 of the fabric 4;

[0065] Step D: If the second weft density D2 is to be controlled to be equal to the preset weft density D0, the control unit 7 increases the pressure of the rubber blanket mechanism 13 in advance to increase D2. When D2 is greater than D0, the control unit 7 maintains the pressure of the rubber blanket mechanism 13 unchanged and increases the running speed of the blanket mechanism 16 to reduce D2. When D2 is equal to D0, the control unit 7 maintains the running speed of the blanket mechanism 16 unchanged. When D2 is less than D0 and the running speed of the blanket mechanism 16 is not lower than the preset safety threshold, the control unit 7 reduces the running speed of the blanket mechanism 16. When D2 is less than D0 and the running speed of the blanket mechanism 16 is equal to D0, the control unit 7 reduces the running speed of the blanket mechanism 16. When the speed is lower than the preset safety threshold, the control unit 7 maintains the operating speed of the felt mechanism 16 above the preset safety threshold and increases the pressure of the rubber blanket mechanism 13 or reduces the operating speed of the overfeed mechanism 12; if the weft shrinkage S1 is to be controlled to be equal to the preset weft shrinkage S0, when S1 is less than S0, the control unit 7 increases the pressure of the rubber blanket mechanism 13 to increase S1; when S1 is equal to S0, the control unit 7 keeps the pressure of the rubber blanket mechanism 13 unchanged and keeps the speed ratio of the overfeed mechanism 12 to the felt blanket mechanism 16 unchanged; when S1 is greater than S0, the control unit 7 reduces the pressure of the rubber blanket mechanism 13.

[0066] The above-mentioned method for online detection and control of fabric density and shrinkage can be used to perform online real-time detection and control of the weft density D and weft shrinkage S of the fabric 4, and may further include the following steps:

[0067] In step A, the first tension detection device 311 performs real-time detection of the tension of the fabric 4 before processing, and the second tension detection device 321 performs real-time detection of the tension of the fabric 4 after processing;

[0068] In step D, when the tension detected by the first tension detection device 311 is greater than the preset value, the control unit 7 controls the first tension control mechanism 312 and the overfeed mechanism 12 or the centering mechanism 11 to accelerate synchronously; when the tension detected by the first tension detection device 311 is less than the preset value, the control unit 7 controls the first tension control mechanism 312 and the overfeed mechanism 12 or the centering mechanism 11 to decelerate synchronously; when the tension detected by the first tension detection device 311 is equal to the preset value, the control unit 7 maintains the operating speed of the first tension control mechanism 312 and the overfeed mechanism 12 or the centering mechanism 11 unchanged; when When the tension detected by the second tension detection device 321 is greater than a preset value, the control unit 7 controls the second tension control mechanism 322, the active roller 17, and the fabric swinging mechanism 18 to accelerate synchronously. When the tension detected by the second tension detection device 321 is less than the preset value, the control unit 7 controls the second tension control mechanism 322, the active roller 17, and the fabric swinging mechanism 18 to decelerate synchronously. When the tension detected by the second tension detection device 321 is equal to the preset value, the control unit 7 maintains the operating speed of the second tension control mechanism 322, the active roller 17, and the fabric swinging mechanism 18 unchanged.

[0069] Another method for online detection and control of fabric density and shrinkage comprises the following steps:

[0070] Step A: The third detection device 23 photographs the fabric 4 before processing to obtain third image data, the pre-shrinking device 1 performs pre-shrinking processing on the fabric 4, and the fourth detection device 24 photographs the fabric 4 after processing to obtain fourth image data;

[0071] Step B: The calculation unit 6 performs image processing on the third image data and the fourth image data to calculate the first width W1 of the fabric 4 before processing and the second width W2 after processing. The calculation unit 6 calculates the radial shrinkage of the fabric 4 in the current camera area after processing by the pre-shrinking device 1 based on the first width W1 and the second width W2.

[0072] Step C: Repeating steps A and B while the fabric 4 is being conveyed forward, to achieve online real-time detection of the first width W1, the second width W2, and the radial shrinkage F1 of the fabric 4;

[0073] Step D: If the second width W2 is to be controlled to be equal to the preset width W0 or the radial shrinkage F1 is to be equal to the preset warp shrinkage F0, when W2 is greater than W0 or F1 is greater than F0, the control unit 7 reduces the operating speed of the overfeed mechanism 12; when W2 is less than W0 or F1 is less than F0, the control unit 7 increases the operating speed of the overfeed mechanism 12; when W2 is equal to W0 or F1 is equal to F0, the control unit 7 maintains the operating speed of the overfeed mechanism 12 unchanged.

[0074] The above-mentioned method for online detection and control of fabric density and shrinkage can be used to perform online real-time detection and control of the width W and radial shrinkage F of the fabric 4, and may further include the following steps:

[0075] In step A, the first tension detection device 311 performs real-time detection of the tension of the fabric 4 before processing, and the second tension detection device 321 performs real-time detection of the tension of the fabric 4 after processing;

[0076] In step D, when the tension detected by the first tension detection device 311 is greater than the preset value, the control unit 7 controls the first tension control mechanism 312 and the overfeed mechanism 12 or the centering mechanism 11 to accelerate synchronously; when the tension detected by the first tension detection device 311 is less than the preset value, the control unit 7 controls the first tension control mechanism 312 and the overfeed mechanism 12 or the centering mechanism 11 to decelerate synchronously; when the tension detected by the first tension detection device 311 is equal to the preset value, the control unit 7 maintains the operating speed of the first tension control mechanism 312 and the overfeed mechanism 12 or the centering mechanism 11 unchanged; when When the tension detected by the second tension detection device 321 is greater than a preset value, the control unit 7 controls the second tension control mechanism 322, the active roller 17, and the fabric swinging mechanism 18 to accelerate synchronously. When the tension detected by the second tension detection device 321 is less than the preset value, the control unit 7 controls the second tension control mechanism 322, the active roller 17, and the fabric swinging mechanism 18 to decelerate synchronously. When the tension detected by the second tension detection device 321 is equal to the preset value, the control unit 7 maintains the operating speed of the second tension control mechanism 322, the active roller 17, and the fabric swinging mechanism 18 unchanged.

[0077] The various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A fabric density and shrinkage online detection and control system, characterized by: The invention comprises a pre-shrinking device (1) for processing a fabric (4) to obtain a finished fabric meeting a preset density or shrinkage requirement, wherein the pre-shrinking device (1) is provided with a first detection device (21) and a second detection device (22) for online real-time photographing of the fabric (4) on one side close to the fabric input end and on the other side close to the fabric output end, respectively. The pre-shrinking device (1) is also provided with: A calculation unit (6) is used to receive image data from the first detection device (21) and the second detection device (22) and calculate and process the image data to obtain weft density data or weft shrinkage data of the fabric (4); A safety detection device (20) for detecting the conveying state of the fabric (4) in the preshrinking device (1); A control unit (7) is used to receive the weft density data or weft shrinkage data obtained by the calculation unit (6) and compare them with the preset weft density or weft shrinkage respectively, and to control the actuator of the pre-shrinkage device (1) to make adjustments in real time according to the comparison results so that the weft density or weft shrinkage of the processed fabric (4) meets the preset requirements; The actuator comprises a centering mechanism (11), an overfeeding mechanism (12), a rubber blanket mechanism (13), a roller mechanism (14), a heating mechanism (15), and a felt blanket mechanism (16) which are sequentially arranged along the conveying direction of the fabric (4); the first detection device (21) is located between the fabric input end of the pre-shrinking device (1) and the rubber blanket mechanism (13); the second detection device (22) is located between the outlet of the felt blanket mechanism (16) and the fabric output end of the pre-shrinking device (1); and the safety detection device (20) is located between the rubber blanket mechanism (13) and the felt blanket mechanism (16); The pre-shrinking device (1) is provided with a first tension device (31) and a second tension device (32) for detecting and controlling the tension of the fabric (4) on one side close to the fabric input end and on the other side close to the fabric output end, respectively. The first tension device (31) includes a first tension detection device (311) for detecting the tension of the fabric (4). The first tension device (31) also includes a first tension control mechanism (312) for cooperating with the centering mechanism (11) or the overfeeding mechanism (12) to adjust and control the tension of the fabric (4). An active roller (17) and a fabric swing mechanism (18) are provided in sequence between the second tension device (32) and the fabric output end of the pre-shrinking device (1) along the conveying direction of the fabric (4). The second tension device (32) includes a second tension detection device (321) for detecting the tension of the fabric (4). The second tension device (32) also includes a second tension control mechanism (322) for cooperating with the active roller (17) and the fabric swing mechanism (18) to adjust and control the tension of the fabric (4).

2. The fabric density and shrinkage online detection and control system according to claim 1, characterized in that: The pre-shrinking device (1) is provided with a third detection device (23) and a fourth detection device (24) for online real-time shooting of the fabric (4) image, respectively, on one side close to the fabric input end and on one side close to the fabric output end. The calculation unit (6) is electrically connected to the third detection device (23) and the fourth detection device (24), respectively. The calculation unit (6) receives the image data of the third detection device (23) and the fourth detection device (24) and calculates and processes the image data to obtain the width data or warp shrinkage data of the fabric (4). The control unit (7) receives the width data or warp shrinkage data obtained by the calculation unit (6) and compares it with a preset width or warp shrinkage. The control unit (7) controls the actuator of the pre-shrinking device (1) in real time according to the comparison result to make adjustments so that the width or warp shrinkage of the processed fabric (4) meets the preset requirements.

3. The fabric density and shrinkage online detection and control system according to claim 1, characterized in that: The first detection device (21) or the second detection device (22) comprises an image acquisition device and a light source board (8) coordinated with the image acquisition device. The light source board (8) comprises a panel (81) and a slide rail (82). The slide rail (82) is connected to a sliding seat (83) capable of sliding relative thereto. Rotating columns (84) rotatably connected to the sliding seat (83) are provided on opposite sides of the panel (81). A light source (85) is provided on the panel (81).

4. The fabric density and shrinkage online detection and control system according to claim 1, characterized in that: The safety detection device (20) is located between the rubber blanket mechanism (13) and the felt blanket mechanism (16). The safety detection device (20) is a distance sensor for measuring the distance between the fabric (4) and the safety detection device, or the safety detection device (20) is a tension detection device for measuring the tension of the fabric (4).

5. A method for online detection and control of fabric density and shrinkage, characterized by: Step A: a first detection device (21) photographs the fabric (4) before processing to obtain first image data, a pre-shrinking device (1) performs pre-shrinking processing on the fabric (4), and a second detection device (22) photographs the fabric (4) after processing to obtain second image data; Step B: The calculation unit (6) performs image processing on the first image data and the second image data to calculate the first weft density D1 of the fabric (4) before processing and the second weft density D2 after processing. The calculation unit (6) calculates the weft shrinkage rate of the fabric (4) after the current camera area is processed by the pre-shrinkage device (1) based on the first weft density D1 and the second weft density D2. Step C: repeating steps A and B when the fabric (4) is conveyed forward, so as to realize online real-time detection of the first weft density D1, the second weft density D2, and the weft shrinkage S1 of the fabric (4); Step D: if the second weft density D2 is to be controlled to be equal to the preset weft density D0, the control unit (7) increases the pressure of the rubber blanket mechanism (13) in advance to increase D2; when D2 is greater than D0, the control unit (7) keeps the pressure of the rubber blanket mechanism (13) unchanged and increases the running speed of the blanket mechanism (16) to reduce D2; when D2 is equal to D0, the control unit (7) keeps the running speed of the blanket mechanism (16) unchanged; when D2 is less than D0 and the running speed of the blanket mechanism (16) is not lower than the preset safety threshold, the control unit (7) reduces the pressure of the blanket mechanism (13) When D2 is less than D0 and the running speed of the felt blanket mechanism (16) is lower than a preset safety threshold, the control unit (7) maintains the running speed of the felt blanket mechanism (16) above the preset safety threshold and increases the pressure of the rubber blanket mechanism (13) or reduces the running speed of the overfeed mechanism (12); if the weft shrinkage S1 is to be controlled to be equal to the preset weft shrinkage S0, when S1 is less than S0, the control unit (7) increases the pressure of the rubber blanket mechanism (13) to increase S1; when S1 is equal to S0, the control unit (7) maintains the pressure of the rubber blanket mechanism (13) unchanged and maintains the speed ratio of the overfeed mechanism (12) to the felt blanket mechanism (16) unchanged; when S1 is greater than S0, the control unit (7) reduces the pressure of the rubber blanket mechanism (13); The pre-shrinking device (1) is provided with a first tension device (31) and a second tension device (32) for detecting and controlling the tension of the fabric (4) on one side close to the fabric input end and on the other side close to the fabric output end, respectively; an active roller (17) and a fabric swing mechanism (18) are provided in sequence along the conveying direction of the fabric (4) between the second tension device (32) and the fabric output end of the pre-shrinking device (1); In step A, the first tension detection device (311) performs real-time detection on the tension of the fabric (4) before processing, and the second tension detection device (321) performs real-time detection on the tension of the fabric (4) after processing; In step D, when the tension detected by the first tension detection device (311) is greater than a preset value, the control unit (7) controls the first tension control mechanism (312) and the overfeed mechanism (12) or the centering mechanism (11) to accelerate synchronously; when the tension detected by the first tension detection device (311) is less than the preset value, the control unit (7) controls the first tension control mechanism (312) and the overfeed mechanism (12) or the centering mechanism (11) to decelerate synchronously; when the tension detected by the first tension detection device (311) is equal to the preset value, the control unit (7) maintains the operating speeds of the first tension control mechanism (312) and the overfeed mechanism (12) or the centering mechanism (11) unchanged; when When the tension detected by the second tension detection device (321) is greater than a preset value, the control unit (7) controls the second tension control mechanism (322), the active roller (17), and the fabric swing mechanism (18) to accelerate synchronously; when the tension detected by the second tension detection device (321) is less than the preset value, the control unit (7) controls the second tension control mechanism (322), the active roller (17), and the fabric swing mechanism (18) to decelerate synchronously; when the tension detected by the second tension detection device (321) is equal to the preset value, the control unit (7) maintains the operating speeds of the second tension control mechanism (322), the active roller (17), and the fabric swing mechanism (18) unchanged.

6. A method for online detection and control of fabric density and shrinkage, characterized by: Step A: the third detection device (23) photographs the fabric (4) before processing to obtain third image data, the pre-shrinking device (1) performs pre-shrinking processing on the fabric (4), and the fourth detection device (24) photographs the fabric (4) after processing to obtain fourth image data; Step B: The calculation unit (6) performs image processing on the third image data and the fourth image data to calculate the first width W1 of the fabric (4) before processing and the second width W2 after processing. The calculation unit (6) calculates the radial shrinkage of the fabric (4) after the current camera area is processed by the pre-shrinkage device (1) based on the first width W1 and the second width W2. Step C: repeating steps A and B while the fabric (4) is being conveyed forward, thereby achieving online real-time detection of the first width W1, the second width W2, and the radial shrinkage F1 of the fabric (4); Step D: If the second width W2 is to be controlled to be equal to the preset width W0 or the radial shrinkage F1 is to be equal to the preset warp shrinkage F0, when W2 is greater than W0 or F1 is greater than F0, the control unit (7) reduces the operating speed of the overfeed mechanism (12); when W2 is less than W0 or F1 is less than F0, the control unit (7) increases the operating speed of the overfeed mechanism (12); when W2 is equal to W0 or F1 is equal to F0, the control unit (7) maintains the operating speed of the overfeed mechanism (12) unchanged; The pre-shrinking device (1) is provided with a first tension device (31) and a second tension device (32) for detecting and controlling the tension of the fabric (4) on one side close to the fabric input end and on the other side close to the fabric output end, respectively; an active roller (17) and a fabric swing mechanism (18) are provided in sequence along the conveying direction of the fabric (4) between the second tension device (32) and the fabric output end of the pre-shrinking device (1); In step A, the first tension detection device (311) performs real-time detection on the tension of the fabric (4) before processing, and the second tension detection device (321) performs real-time detection on the tension of the fabric (4) after processing; In step D, when the tension detected by the first tension detection device (311) is greater than a preset value, the control unit (7) controls the first tension control mechanism (312) and the overfeed mechanism (12) or the centering mechanism (11) to accelerate synchronously; when the tension detected by the first tension detection device (311) is less than the preset value, the control unit (7) controls the first tension control mechanism (312) and the overfeed mechanism (12) or the centering mechanism (11) to decelerate synchronously; when the tension detected by the first tension detection device (311) is equal to the preset value, the control unit (7) maintains the operating speeds of the first tension control mechanism (312) and the overfeed mechanism (12) or the centering mechanism (11) unchanged; when When the tension detected by the second tension detection device (321) is greater than a preset value, the control unit (7) controls the second tension control mechanism (322), the active roller (17), and the fabric swing mechanism (18) to accelerate synchronously; when the tension detected by the second tension detection device (321) is less than the preset value, the control unit (7) controls the second tension control mechanism (322), the active roller (17), and the fabric swing mechanism (18) to decelerate synchronously; when the tension detected by the second tension detection device (321) is equal to the preset value, the control unit (7) maintains the operating speeds of the second tension control mechanism (322), the active roller (17), and the fabric swing mechanism (18) unchanged.

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