Intelligent tension unwinding control mechanism for cloth

Abstract

The utility model relates to the technical field of cloth inspecting machines, and particularly discloses an intelligent tension unwinding control mechanism for cloth, which comprises an unwinding component. The intelligent tension unwinding control mechanism further comprises a buffer space used in cooperation with the unwinding assembly, a detection assembly used for detecting cloth unwound by the unwinding assembly in the buffer space, and a control system electrically matched with the unwinding assembly and the detection assembly for use. The detection assembly is used for detecting the tension of the cloth in the buffer space or the stacking height of the cloth in the buffer space; the unwinding assembly comprises a first driving part and an unwinding roller which is connected with the first driving part and used for unwinding external cloth, the driving end of the first driving part is electrically connected with the control system, and the detection assembly triggers the control system to adjust the rotating speed of the unwinding roller driven by the first driving part according to detected parameter data of the tension or stacking height of the cloth. Adjustment of the unwinding speed of the unwinding roller is achieved, and then the tension of cloth is adjusted.

Description

Technical Field

[0001] This utility model relates to the field of fabric inspection machine technology, and in particular discloses an intelligent tension unwinding control mechanism for fabric. Background Technology

[0002] In continuous fabric processing technologies such as textile printing and dyeing, and nonwoven fabric production, precise control of unwinding tension directly affects the fabric's smoothness, processing quality, and equipment operational stability. Traditional tension control methods often employ mechanical friction plate adjustment or contact sensor feedback schemes, which have the following technical drawbacks: limited detection accuracy; contact-based detection devices are easily affected by the fabric surface condition, leading to measurement errors due to mechanical wear; and the passive adjustment mode based on physical contact has a slow response speed, making it difficult to adapt to the demands of modern high-speed production. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide an intelligent tension unwinding control mechanism for fabrics.

[0004] To achieve the above objectives, the present invention provides an intelligent tension unwinding control mechanism for fabric, comprising an unwinding assembly; characterized in that: the intelligent tension unwinding control mechanism further comprises a buffer space used in conjunction with the unwinding assembly, a detection assembly for detecting the fabric unwound by the unwinding assembly in the buffer space, and a control system electrically used in conjunction with the unwinding assembly and the detection assembly, wherein the detection assembly is used to detect the tension of the fabric in the buffer space or the height of the fabric accumulation in the buffer space;

[0005] The unwinding assembly includes a first driving member and an unwinding roller connected to the first driving member for unwinding external fabric. The driving end of the first driving member is electrically connected to the control system. The detection component triggers the control system to adjust the rotational speed of the unwinding roller driven by the first driving member based on the detected parameters of the fabric tension or stacking height, thereby adjusting the unwinding speed of the unwinding roller and thus adjusting the tension of the fabric.

[0006] Furthermore, the detection component is a non-contact ultrasonic photocell, which includes an ultrasonic transmitter and an ultrasonic receiver. The ultrasonic transmitter emits ultrasonic waves onto the fabric surface and receives the reflected waves reflected by the fabric, measuring the distance between the fabric and the ultrasonic transmitter to determine the magnitude of the fabric tension.

[0007] Furthermore, the intelligent tension unwinding control mechanism also includes a winding assembly, which includes a second drive member and a winding roller connected to the second drive member. The winding roller is electrically connected to the control system. The detection component detects changes in tension value and feeds them back to the control system. The control system synchronously adjusts the rotational speeds of the first drive member and the second drive member to keep the tension at the winding end balanced with the tension at the unwinding end.

[0008] Furthermore, a torque sensor is provided between the take-up roller and the second drive component. The torque sensor is connected to the control system. The torque sensor is used to detect the torque signal of the take-up roller and feed it back to the control system. The control system adjusts the output torque of the second drive component according to the deviation between the preset fabric tension value and the actual value, thereby adjusting the rotational speed of the take-up roller.

[0009] Furthermore, three sets of non-contact ultrasonic photocells are arranged along the width of the fabric transmission path, with the three sets of ultrasonic photocells located at the left edge, center, and right edge of the fabric, respectively.

[0010] Furthermore, the intelligent tension unwinding control mechanism also includes multiple support rollers located between the unwinding assembly and the winding assembly. The fabric is guided by these support rollers and conveyed in an S-shape. This reduces wrinkles and deviations in the fabric during transport, improving the flatness and accuracy of the fabric unwinding.

[0011] Furthermore, the tension unwinding control mechanism also includes an emergency braking module. The emergency braking module includes a speed sensor that works in conjunction with the fabric released by the unwinding assembly and a mechanical gripper that is linked to the unwinding roller. When the speed sensor detects that the fabric transmission speed changes by more than ±20%, the control system controls the mechanical gripper to brake the unwinding roller.

[0012] Furthermore, at least two unwinding rollers are provided, and the two unwinding rollers are connected to the first drive member via a gear belt. The at least two unwinding rollers are used to alternately perform unwinding actions to ensure continuous fabric supply, or the roll of material to be unwound is pressed onto the at least two unwinding rollers under the action of gravity.

[0013] Furthermore, the tension unwinding control mechanism also includes a fabric spreading component that works in conjunction with the unwinding assembly. The fabric spreading component includes a third drive member, a fabric spreading roller connected to the third drive member, and two spiral coils wound around the fabric spreading roller. The spiral directions of the two spiral coils are opposite. The fabric spreading component is used to assist in flattening the fabric unwound by the unwinding assembly for use with the detection component.

[0014] Furthermore, the tension unwinding control mechanism also includes an alarm module, which is connected to the detection component. When the detection component detects that the fabric tension is continuously lower than a preset value, the alarm device sends an alarm to the control system, and the control system regulates the first driving component to adjust the fabric tension.

[0015] This utility model patent's intelligent tension unwinding control mechanism detects the fabric tension in real time using a detection component (non-contact ultrasonic photoelectric sensor) installed along the fabric transport path, and feeds the detected tension signal back to the control system. The control system generates control commands based on the deviation between the preset fabric tension value and the actual detected value, adjusting the rotational speeds of the first drive component of the unwinding assembly and the second drive component of the winding assembly. This achieves precise control of the unwinding and winding rollers, thereby maintaining tension balance in the fabric during unwinding and winding. Furthermore, the mechanism includes an emergency braking module, multiple support rollers, a fabric spreading assembly, and an alarm module to further improve the stability and quality of fabric unwinding.

[0016] The beneficial effects of this utility model are as follows: The intelligent tension unwinding control mechanism of this utility model patent can achieve high-precision control of fabric tension, effectively avoiding problems such as wrinkles, deviations, and uneven tension that occur during the unwinding and rewinding processes. This improves the flatness and precision of the fabric, reduces the scrap rate in the production process, and enhances production efficiency and product quality. Simultaneously, through automated control and the inclusion of various auxiliary modules, manual intervention is reduced, lowering labor intensity and demonstrating high practicality and promotional value. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the position of the non-contact ultrasonic photocell of this utility model. Figure 1 ;

[0018] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle;

[0019] Figure 3 This is a partial structural diagram of the unwinding assembly of this utility model. Figure 1 ;

[0020] Figure 4 This is a partial structural diagram of the unwinding assembly of this utility model. Figure 2 ;

[0021] Figure 5 This is a schematic diagram of the position of the non-contact ultrasonic photocell of this utility model. Figure 2 ;

[0022] Figure 6 for Figure 5 A magnified structural diagram of part B in the middle section;

[0023] Figure 7 This is a structural schematic diagram of the winding assembly and spreading assembly of this utility model.

[0024] The reference numerals in the figures include:

[0025] 1. Frame; 2. Unwinding assembly; 3. Rewinding assembly; 4. Non-contact ultrasonic photocell; 5. Support roller; 6. Fabric spreading assembly; 11. Control system; 100. Fabric inspection machine; 41. Mounting bracket; 42. Ultrasonic transmitter; 21. First drive component; 22. Unwinding roller; 2111. First gear; 2112. Second gear; 31. Second drive component; 32. Rewinding roller; 61. Third drive component; 62. Fabric spreading roller; 63. Spiral coil. Detailed Implementation

[0026] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0027] Please see Figures 1 to 7 As shown, the present invention provides an intelligent tension unwinding control mechanism for fabric, comprising an unwinding assembly 2; characterized in that: the intelligent tension unwinding control mechanism further comprises a buffer space used in conjunction with the unwinding assembly 2, a detection assembly for detecting the fabric unwound by the unwinding assembly 2 in the buffer space, and a control system 11 electrically used in conjunction with the unwinding assembly and the detection assembly, wherein the detection assembly is used to detect the tension of the fabric in the buffer space or the height of the fabric accumulation in the buffer space;

[0028] The unwinding assembly 2 includes a first drive member 21 and an unwinding roller 22 connected to the first drive member 21 for unwinding external fabric. The drive end of the first drive member 21 is electrically connected to the control system 11. The detection component triggers the control system 11 to adjust the rotational speed of the unwinding roller 22 driven by the first drive member 21 according to the detected parameters of the fabric tension or stacking height, thereby adjusting the unwinding speed of the unwinding roller 22 and thus adjusting the tension of the fabric.

[0029] In this implementation, a servo motor (model: SM80-040-30LFB) is used as the primary drive component 21, connected to a Φ200mm aluminum alloy unwinding roller 22 via a coupling. The control system 11 employs a PLC controller (Siemens S7-1200), with a KEYENCE UT-300 ultrasonic sensor installed 200mm above the transmission path to form a detection component. When the detected fabric sagging distance exceeds 5mm, the PLC automatically calculates the speed compensation value and adjusts the servo motor speed using a PID algorithm, achieving a speed adjustment accuracy of ±0.5m / min. This structure reduces the tension control response time to 0.3 seconds, achieving closed-loop dynamic adjustment and solving the lag problem of traditional mechanical tension levers.

[0030] Specifically, this embodiment uses a three-probe ultrasonic photocell (UT-330 type), installed at a height of 150±5mm above the fabric surface. The transmitter emits pulse waves at a frequency of 40kHz, and the receiver calculates the fabric displacement using the TOF ranging principle. Actual measurement data shows that when the fabric tension changes from 50N to 80N, the detection distance changes from 150mm to 142mm. The PLC performs the conversion based on a preset tension-displacement curve, achieving a measurement resolution of 0.1N. Non-contact detection avoids fabric damage and improves detection sensitivity.

[0031] Specifically, the take-up end is equipped with a permanent magnet synchronous motor with an encoder (second drive unit 31), which communicates with the PLC via an EtherCAT bus. When the ultrasonic photoelectric sensor detects a tension change, the PLC simultaneously sends speed commands to both drive units, maintaining speed synchronization using a master-slave control mode. Experimental data shows that this scheme can control the take-up / unwind speed difference within ±0.2%, ensuring that tension fluctuations do not exceed ±3N. It achieves precise dual-axis synchronization, eliminating sudden tension changes caused by speed differences.

[0032] Specifically, three UT-330 sensors are arranged at equal intervals along the width direction, with adjustable spacing (range 500-2000mm). The PLC processes the three signals using a weighted algorithm; when the difference in detection values ​​between the left and right sides exceeds 15%, the flattening assembly is triggered. Practical applications show that this solution can reduce the tension difference along the width direction from 20% in traditional solutions to less than 5%. It aims to solve the problem of uneven tension distribution in wide-width fabrics.

[0033] Specifically, an HBM T40B torque sensor with a sampling frequency of 1kHz is installed on the output shaft of the take-up motor. The PLC monitors the torque value in real time, and automatically switches to torque-priority mode when the detected value exceeds the set range (e.g., ±10%). Combined with a fuzzy control algorithm, this ensures that the winding tension remains stable within ±2N of the set value. This dual-protection mechanism enhances system reliability.

[0034] Specifically, seven Φ50mm silicone-coated rollers with a surface hardness of 60±5 Shore A are used, arranged in an S-shaped path. The roller spacing is set according to the fabric weight (800mm for lightweight fabrics, 500mm for heavyweight fabrics), and is adaptively adjusted using a pneumatic lifting device. Actual measurements show that this reduces lateral wrinkles by 85%, ensuring the stability of the fabric transport path.

[0035] Specifically, using the OMRON E2E-X18MF1-Z speed sensor, when a sudden speed change is detected, the Festo ADN-40-10 pneumatic gripper completes braking within 0.1 seconds. After emergency braking, the system automatically performs a 3-second reverse rotation (at a speed of 0.5 m / s) to eliminate the effects of inertia, achieving a millisecond-level safety response.

[0036] Specifically, the two unwinding rollers 22 are connected to the first drive unit 21 via a gear and belt mechanism (the first gear 2111 is connected to the output end of the first drive unit 21, and the two second gears 2112 are respectively connected to the two unwinding rollers 22 and connected to the first gear 2111 via a gear belt), and are switched via an electromagnetic clutch. When the diameter of the main roller decreases to Φ150mm, the auxiliary roller accelerates to 1.05 times the speed in advance, achieving seamless switching. In actual production, this can reduce downtime by 98%, ensuring continuous production.

[0037] Specifically, the spreading roller 62 has a reverse double helix (120mm lead, 2mm wire diameter) machined on its surface and is driven by a Delta ECMA-C2060RS motor. When a lateral tension difference is detected, the PLC controls the spreading roller 62 to rotate at a speed of 5-20 rpm, generating a width-expanding force. Experiments show that this can eliminate 90% of the curling phenomenon.

[0038] Specifically, this embodiment includes a two-level alarm mechanism for the tension adjustment mechanism: an audible and visual alarm is triggered when the tension is 10% below the set value for 5 seconds; the mechanism automatically shuts down when the tension is below 20%. The historical data storage function can record the most recent 1000 abnormal events and supports USB export for analysis.

[0039] When this intelligent tension unwinding control mechanism is in operation: three ultrasonic photocells monitor the fabric sag in real time, and the PLC converts the displacement signal into a tension value. When an abnormal tension is detected, the speeds of the unwinding servo motor and the winding permanent magnet motor are adjusted synchronously, while a torque sensor provides secondary verification. The dual unwinding rollers 22 feed the fabric alternately through a gearbox, and the support roller 5 maintains stable fabric transmission. In the event of a sudden speed change, the emergency gripper immediately brakes, and the spreading roller 62 simultaneously eliminates wrinkles. The entire process is monitored by an alarm module, forming a complete intelligent control closed loop.

[0040] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. An intelligent tension unwinding control mechanism for fabric, comprising an unwinding assembly (2); characterized in that: The intelligent tension unwinding control mechanism also includes a buffer space used in conjunction with the unwinding assembly (2), a detection assembly for detecting the fabric unwound by the unwinding assembly (2) in the buffer space, and a control system (11) used in conjunction with the unwinding assembly (2) and the detection assembly. The detection assembly is used to detect the tension of the fabric in the buffer space or the height of the fabric piled up in the buffer space. The unwinding assembly (2) includes a first drive member (21) and an unwinding roller (22) connected to the first drive member (21) for unwinding external fabric. The drive end of the first drive member (21) is electrically connected to the control system (11). The detection assembly triggers the control system (11) to adjust the rotation speed of the unwinding roller (22) driven by the first drive member (21) according to the detected parameters of the fabric tension or stacking height, thereby adjusting the unwinding speed of the unwinding roller (22) and thus adjusting the tension of the fabric.

2. The intelligent tension unwinding control mechanism for fabric according to claim 1, characterized in that: The detection component is a non-contact ultrasonic photocell (4). The non-contact ultrasonic photocell (4) has an ultrasonic transmitter and an ultrasonic receiver. The ultrasonic transmitter emits ultrasonic waves to the surface of the fabric and receives the reflected waves reflected by the fabric. It measures the distance between the fabric and the ultrasonic transmitter to determine the magnitude of the fabric tension.

3. The intelligent tension unwinding control mechanism for fabric according to claim 1, characterized in that: The intelligent tension unwinding control mechanism also includes a winding assembly (3), which includes a second drive member (31) and a winding roller (32) connected to the second drive member (31). The winding roller (32) is electrically connected to the control system (11). The detection assembly detects the change in tension value and feeds it back to the control system (11). The control system (11) synchronously adjusts the rotation speed of the first drive member (21) and the second drive member (31) to keep the tension at the winding end and the tension at the unwinding end balanced.

4. The intelligent tension unwinding control mechanism for fabric according to claim 3, characterized in that: A torque sensor is provided between the take-up roller (32) and the second drive member (31). The torque sensor is electrically connected to the control system (11). The torque sensor is used to detect the torque signal of the take-up roller (32) and feed it back to the control system (11). The control system (11) adjusts the output torque of the second drive member (31) according to the deviation between the preset fabric tension value and the actual value, thereby adjusting the rotation speed of the take-up roller (32).

5. The intelligent tension unwinding control mechanism for fabric according to claim 1, characterized in that: The detection component is arranged in three sets along the width of the fabric transport path, with the three sets of ultrasonic photocells located at the left edge, center, and right edge of the fabric, respectively.

6. The intelligent tension unwinding control mechanism for fabric according to claim 3, characterized in that: The intelligent tension unwinding control mechanism also includes multiple support rollers (5), which are located between the unwinding assembly (2) and the winding assembly (3). The fabric is transported in an S-shape by the guidance of the multiple support rollers (5).

7. The intelligent tension unwinding control mechanism for fabric according to claim 1, characterized in that: The intelligent tension unwinding control mechanism also includes an emergency braking module. The emergency braking module includes a speed sensor that works in conjunction with the fabric released by the unwinding assembly (2) and a mechanical gripper that is linked to the unwinding roller (22). When the speed sensor detects that the fabric transmission speed changes by more than ±20%, the control system (11) controls the mechanical gripper to brake the unwinding roller (22).

8. The intelligent tension unwinding control mechanism for fabric according to claim 1, characterized in that: At least two unwinding rollers (22) are provided, and the two unwinding rollers (22) are connected to the first drive member (21) via a gear belt structure; the at least two unwinding rollers (22) are used to alternately perform unwinding actions to ensure continuous supply of fabric, or the roll of material to be unwound is pressed on the at least two unwinding rollers (22) under the action of gravity.

9. The intelligent tension unwinding control mechanism for fabric according to claim 1, characterized in that: The tension unwinding control mechanism also includes a fabric spreading assembly (6) that cooperates with the unwinding assembly (2). The fabric spreading assembly (6) includes a third drive member (61), a fabric spreading roller (62) connected to the third drive member (61), and two spiral coils (63) spirally wound on the fabric spreading roller (62). The spiral directions of the two spiral coils (63) are opposite. The fabric spreading assembly (6) is used to assist in flattening the fabric unwound by the unwinding assembly (2) in cooperation with the detection assembly.

10. The intelligent tension unwinding control mechanism for fabric according to claim 1, characterized in that: The tension unwinding control mechanism also includes an alarm module, which is connected to the detection component. When the detection component detects that the fabric tension is continuously lower than the preset value, the alarm module sends an alarm to the control system, and the control system (11) regulates the first drive component (21) to adjust the fabric tension.

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