Large-tension stretching device for boarding machine

Abstract

The utility model provides a large-tension stretching device for a boarding machine, which comprises a main frame and at least two groups of traction rollers arranged in the main frame and used for dragging fabric along a fabric running path; the at least two groups of driving motors are mounted at the side part of the main rack, are in transmission connection with the traction rollers respectively and are used for independently driving the corresponding traction rollers; the tension sensing device is arranged on a fabric running path in the main frame and is used for detecting the running tension of the fabric; and the PLC is electrically connected with the driving motor and the tension sensing device. According to the utility model, the traction rollers are respectively controlled by the at least two groups of independent driving motors, and the rotating speed of each motor is accurately adjusted by the PLC according to the real-time tension feedback or the preset value so as to generate the speed difference, so that the required target stretching tension can be actively and accurately applied and stably maintained on the fabric. The problems that in the prior art, due to passive braking or a non-independent driving roller system, tension control is not accurate, response is slow, and the adjusting range is limited are solved.

Description

[Technical Field]

[0002] This utility model relates to the field of textile finishing equipment technology, and in particular to a high-tension stretching device for a setting machine. [Background Technology]

[0004] In the textile dyeing and finishing industry, setting is a key process in the finishing process, aiming to give fabrics stable dimensions, improved hand feel and appearance, and to solidify certain functional finishing effects. The setting machine is the core equipment for performing this process; it treats the fabric by heating and applying precise mechanical tension. Tension control of the fabric during the setting process is crucial, directly affecting the quality of the final product, including width stability, weft skew, surface smoothness, and the degree to which specific functions are achieved.

[0005] The tension control systems of existing stenters typically employ simple passive braking or non-independent drive roller systems. Therefore, when processing fabrics with special tension requirements, the tension control accuracy and range are insufficient, failing to meet the process requirements of high-density fabric expansion and functional finishing that require precise and sufficiently large tension. [Utility Model Content]

[0007] The purpose of this invention is to provide a high-tension stretching device for a setting machine and a method for stretching fabric tension using the device, aiming to solve the problems of low tension control accuracy, limited adjustment range, and difficulty in meeting high tension and special process requirements in the existing technology of setting machines.

[0008] This utility model is achieved through the following technical solution:

[0009] A high-tension stretching device for a setting machine includes a main frame and a component comprising:

[0010] At least two sets of traction rollers are provided in the main frame for traction of the fabric along the fabric running path;

[0011] At least two sets of drive motors are installed on the side of the main frame and are respectively connected to the traction roller for independently driving the corresponding traction roller.

[0012] A tension sensing device is installed on the fabric running path within the main frame to detect the running tension of the fabric.

[0013] The PLC controller is electrically connected to the at least two sets of drive motors and the tension sensing device.

[0014] As described above, a high-tension stretching device for a setting machine includes a first traction roller, a second traction roller, and a third traction roller arranged sequentially along the fabric running path.

[0015] The drive motors include a first drive motor, a second drive motor, and a third drive motor that are respectively connected to the first traction roller, the second traction roller, and the third traction roller for transmission.

[0016] As described above, a high-tension stretching device for a setting machine, wherein the tension sensing device is a pressure torque sensing roller disposed within the main frame and parallel to the traction roller.

[0017] A high-tension stretching device for a setting machine according to any one of claims 1 to 2 further comprises:

[0018] A pressing assembly includes at least one pressing roller and a drive mechanism for driving the pressing roller to press against or away from at least one of the traction rollers;

[0019] A fabric pressing controller is used to control the drive mechanism.

[0020] As described above, a high-tension stretching device for a setting machine includes a driving mechanism comprising a rotating shaft installed within the main frame and parallel to the pressure roller, a lever arm provided between the rotating shaft and the pressure roller, a cylinder connected to the lever arm, the cylinder being fixed to one side within the main frame, and a pressure controller including a solenoid valve for controlling the cylinder.

[0021] The high-tension stretching device for a setting machine as described above further includes a fabric feeding guide assembly located at the side end of the main frame, the fabric feeding guide assembly being located on the fabric feeding side of the traction roller.

[0022] As described above, a high-tension stretching device for a setting machine includes a fabric feeding guide assembly comprising two opposing columns, which are respectively located at both ends of the main frame. A guide roller is provided between the upper and lower parts of the two columns, and a bending roller is provided between the two guide rollers.

[0023] As described above, in a high-tension stretching device for a shaping machine, the bending roller is made of rubber.

[0024] As described above, in a high-tension stretching device for a setting machine, the traction roller is made of rubber.

[0025] As described above, a high-tension stretching device for a shaping machine includes a main frame comprising two opposing end plates, with a crossbeam connected between each corner of the two end plates, and a connecting part at the bottom of the outer side of the end plates that can be fixedly assembled with other structural surfaces.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. This invention employs at least two sets of independent drive motors to control the traction rollers, and a PLC controller precisely adjusts the speed of each motor based on real-time tension feedback or preset values ​​to generate a speed difference. This allows for the active and precise application and stable maintenance of the desired target tensile tension on the fabric. It overcomes the problems of inaccurate tension control, slow response, and limited adjustment range caused by passive braking or non-independent drive roller systems in existing technologies.

[0028] 2. The closed-loop control system consisting of the tension sensing device and the PLC controller can monitor and compensate for tension fluctuations in real time, ensuring that a constant target tension can be maintained even when running at high speed or when the fabric properties change. This significantly improves the stability and accuracy of tension control and helps to improve the uniformity of the final product quality.

[0029] 3. The ability to independently control each traction roller allows for flexible setting and adjustment of tension values ​​or tension distribution according to different fabrics and process requirements, greatly enhancing the adaptability of the device to diverse production needs.

[0030] 4. The PLC controller is also responsible for controlling the overall operating speed of the stretching device to precisely match the speed of the main setting machine, ensuring smooth and coordinated operation with the main production line and avoiding problems such as fabric accumulation, overstretching, or production interruption that may be caused by speed mismatch. [Attached Image Description]

[0032] To more clearly illustrate the technical solutions in the embodiments of the utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0033] Figure 1 This is a schematic diagram of the three-dimensional structure of this embodiment. Figure 1 ;

[0034] Figure 2 This is a schematic diagram of the three-dimensional structure of this embodiment. Figure 2 ;

[0035] Figure 3 This is a schematic diagram of the three-dimensional structure of this embodiment. Figure 3 ;

[0036] Figure 4 This is a front view diagram of this embodiment;

[0037] Figure 5 This is a top view of this embodiment;

[0038] Figure 6 This is a side view of this embodiment;

[0039] Figure 7 This is a schematic diagram of the fabric moving through the fabric during operation in this embodiment;

[0040] Figure 8 This is a three-dimensional schematic diagram of the fabric pressing assembly in this embodiment;

[0041] Figure 9 This is a three-dimensional schematic diagram of the fabric feeding guide component in this embodiment;

[0042] Figure 10 This is a three-dimensional schematic diagram of the main unit frame in this embodiment;

[0043] Figure 11 This is a three-dimensional schematic diagram of the tension sensing device in this embodiment;

[0044] Figure 12 This is a three-dimensional schematic diagram of the traction roller in this embodiment.

Detailed Implementation Methods

[0046] To make the technical problems solved by this application, the technical solutions, and the beneficial effects clearer, this application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0047] Example 1: With the continuous advancement of the textile dyeing and finishing industry and the increasingly stringent market requirements for the processing and quality of various fabrics, especially the higher demands for fabric extensibility and elasticity, existing finishing equipment faces challenges when processing certain special fabrics. For example, some high-density fabrics have insufficient width before finishing, yarn-dyed or printed fabrics are prone to weft skew, functional finishing such as wrinkle prevention needs to be carried out under specific tension, and there are problems such as inconsistent shrinkage rates in blended fabrics with different fiber components.

[0048] To meet market demands for these specialized fabric processes, improve product quality, and fully utilize the physical properties of the fabrics, this embodiment proposes a high-tension stretching device for a setting machine, such as... Figures 1 to 12 As shown, it includes a main frame 1 for supporting the main components of the tensioning device. Within the main frame 1, at least two sets of traction rollers are arranged along the planned running path of the fabric. In this embodiment, two or three sets of traction rollers may be provided. Their function is to pull the fabric during operation. The surface layer of the traction rollers in contact with the fabric is made of rubber. Rubber has a high coefficient of friction, which can effectively clamp and pull the fabric, ensuring that the fabric does not slip on the surface of the traction rollers, thereby accurately transmitting and controlling the tension.

[0049] To drive these traction rollers, at least two sets of drive motors are mounted on the side of the main frame 1, optionally, in this embodiment, 3.9 kW drive motors. Each drive motor is connected to a corresponding set of traction rollers, for example, through direct drive or gearbox, and is designed to independently drive the rotation of its connected traction rollers.

[0050] A tension sensing device 2 is also installed on the fabric running path inside the main frame 1. This tension sensing device 2 is used to detect the actual tension of the fabric during operation in real time.

[0051] The tension stretching device also includes a PLC controller (which can be integrated into the main electrical cabinet of the setting machine, not shown in the figure). This PLC controller establishes electrical signal connections with each of the aforementioned drive motors and the tension sensing device 2. The PLC controller is internally programmed to receive real-time tension signals from the tension sensing device 2 and, based on a pre-set target tension value and / or real-time tension feedback signals, precisely control the rotational speed of each drive motor to create a speed difference between different traction rollers. For example, the linear speed of the downstream traction roller can be controlled to be slightly higher than that of the upstream traction roller, thereby applying and precisely adjusting the target tensile tension on the fabric. It should be noted that the high-tension stretching device of this embodiment can provide a wide range of adjustable tension from 100N to 10000N, depending on the different fabric processing requirements.

[0052] Meanwhile, the PLC controller can also control the overall operating speed of the entire tension stretching device, for example, by using the speed of one of the traction rollers as a reference, or a virtual main speed, to keep it matched and synchronized with the speed of the setter (the speed of the main production line), specifically controlled between 2.5-100m / min.

[0053] By setting up at least two independently driven traction rollers, a tension sensing device 2, and a PLC controller capable of controlling the motor speed difference and overall synchronous speed based on the tension signal / target value, controllable high tension application and adjustment are achieved. By precisely controlling the speed difference between different traction rollers, the required target tensile tension can be directly generated and stably maintained on the fabric. Furthermore, the high-tension stretching device in this embodiment can flexibly set and adjust the tensile tension applied to the fabric according to different fabric types and process requirements, meeting a wider range of production needs. In addition, the overall speed of this tension stretching device can be synchronously controlled with the setting machine speed, ensuring smooth integration and stable operation with the main production line, avoiding fabric quality problems or production interruptions caused by speed mismatch.

[0054] It should be further noted that the high-tension stretching device for the setting machine provided in this embodiment, by precisely controlling the wide range of tensile tension applied to the fabric and operating synchronously with the setting machine, can be applied to, but is not limited to, processing the following types of fabrics:

[0055] a. Fabrics with unstable structures or prone to shrinkage:

[0056] High-density woven fabrics, such as denim and canvas, can solve the problems of their thickness and large weft shrinkage by stretching them to the target width under high tension.

[0057] For yarn-dyed / printed fabrics, such as shirt fabric and curtain fabric, the problem of high weft pre-shrinkage rate is solved by aligning the pattern through high tension stretching, thus avoiding weft skew.

[0058] b. Functional finished fabrics:

[0059] The wrinkle-resistant and non-iron (PP-finished) fabric is shaped under high tension using the high-tension stretching device in this embodiment, which helps the resin cross-link, fixes the fiber molecular chains, and improves the wrinkle resistance.

[0060] Composite fiber blended fabrics, such as polyester-cotton and polyester-viscose, can solve the problem of large differences in the heat shrinkage rate of different fibers. By stretching under high tension, the blended fibers are simultaneously shaped, avoiding the fabric from becoming loose or curled.

[0061] c. Fabrics with special processing requirements:

[0062] The microfiber synthetic leather base fabric is subjected to high-tensile stretching using the high-tensile stretching device in this embodiment to achieve the dense structure required for imitation leather.

[0063] Industrial fabrics, such as filter cloth and conveyor belt base fabric, meet the stringent requirements for high dimensional stability through precise high-tension stretching and multiple shaping processes.

[0064] In summary, the high-tension stretching device of this embodiment, with its precise tension control, can effectively utilize the extensibility and elasticity of fabrics, improve the dimensional stability of fabrics, and provide the necessary process conditions for yarn-dyed or printed fabrics that need to align patterns and prevent weft skew, as well as fabrics that need to be functionally finished under specific tension.

[0065] Furthermore, the traction rollers specifically include a first traction roller 31, a second traction roller 32, and a third traction roller 33 arranged sequentially along the fabric running path. These three sets of traction rollers constitute the main tension application and adjustment area.

[0066] Accordingly, the drive motors specifically include a first drive motor 41, a second drive motor 42, and a third drive motor 43, which are respectively connected to and driven by the first traction roller 31, the second traction roller 32, and the third traction roller 33. The speed of each drive motor can be independently controlled by a PLC controller.

[0067] The configuration of three sets of traction rollers and three sets of independent drive motors, compared to the case with only two sets, forms at least two independent tension control zones, namely between the first traction roller 31 and the second traction roller 32, and between the second traction roller 32 and the third traction roller 33, allowing for more precise and smooth gradient adjustment of fabric tension.

[0068] By precisely controlling the speed difference of the three sets of motors, it is easier to gradually increase or decrease the fabric tension from the inlet to the outlet, achieving progressive tension adjustment and better adapting to fabric processes that are sensitive to tension changes or require specific tension curves. Furthermore, the coordinated operation of the three sets of traction rollers can more stably maintain high tension, dispersing the force acting on individual rollers and contributing to improved stability and reliability of the entire device under high tension.

[0069] Specifically, when a configuration of three sets of traction rollers and three sets of independent drive motors is used, the PLC controller receives real-time fabric tension signals from the tension sensing device 2 and / or receives target tension values ​​set by the operator or preset by the process program. Based on this input information, the PLC controller independently calculates and outputs control signals to the first drive motor 41, the second drive motor 42, and the third drive motor 43 to precisely control their rotational speeds.

[0070] The specific control logic lies in the fact that the PLC controller, through its internal algorithm, establishes and dynamically adjusts two key speed differences:

[0071] First speed difference: between the first traction roller 31 and the adjacent second traction roller 32. The PLC controller precisely sets and maintains the speed difference between the first traction roller 31 and the adjacent second traction roller 32 by controlling the rotational speed of the second drive motor 42 relative to the rotational speed of the first drive motor 41, thereby directly controlling and adjusting the fabric tension in this range.

[0072] The second speed difference exists between the second traction roller 32 and the adjacent third traction roller 33. Similarly, the PLC controller precisely sets and maintains the speed difference between the second traction roller 32 and the adjacent third traction roller 33 by controlling the rotational speed of the third drive motor 43 relative to the rotational speed of the second drive motor 42, thereby directly controlling and adjusting the fabric tension in this subsequent section.

[0073] These two speed differences and their corresponding tensions can be set and adjusted independently, allowing a specific tension distribution or gradient to be formed throughout the device. For example, the second speed difference can be set to be greater than the first speed difference to achieve a gradual increase in tension. The PLC controller adjusts these speed differences in real time based on feedback from the tension sensing device 2 to ensure that the fabric tension remains stable at the target value.

[0074] Because the PLC controller can independently control and adjust the speed difference between at least two adjacent traction roller intervals (between the first traction roller 31 and the adjacent second traction roller 32, and between the second traction roller 32 and the adjacent third traction roller 33), segmented and precise control of fabric tension is achieved, which is crucial for complex fabric processes that require specific tension curves or gradients.

[0075] By independently controlling the speed of each motor and directly applying the speed difference between adjacent roller pairs, the tension adjustment response is faster and more precise, effectively suppressing tension fluctuations and achieving stable, high-precision tension control. Furthermore, it provides a basis for achieving smooth, gradual increases or decreases in fabric tension, effectively preventing damage or deformation caused by sudden tension changes, making it particularly suitable for handling sensitive or demanding fabrics.

[0076] Optionally, in this embodiment, the tension sensing device 2 is specifically in the form of a pressure-torque sensing roller. This pressure-torque sensing roller 2 is installed in the internal space of the main frame 1, and its axial direction is parallel to the axes of the first traction roller 31, the second traction roller 32, and the third traction roller 33 mentioned above.

[0077] The pressure-torque sensing roller 2 is a roller that can rotate freely on a bearing, with the fabric wrapping around it at a certain angle. Its sensing element is a load cell integrated under the bearing housing, capable of accurately detecting the vertical or horizontal force generated by the fabric tension acting on the roller. The magnitude of this force is directly related to the actual operating tension of the fabric. The pressure-torque sensing roller 2 converts the detected force into a standard electrical signal and transmits it to the PLC controller via an electrical connection, serving as an important feedback input for the closed-loop tension control system.

[0078] The pressure-torque sensing roller 2 can be positioned before the fabric enters the first traction roller 31, or between the first traction roller 31 and the second traction roller 32, or after the fabric exits from the third traction roller 33, to detect the tension in critical sections. Its parallel mounting to the traction roller 3 ensures that the fabric can smoothly and evenly contact the sensing roller surface, thereby obtaining an accurate measurement signal representing the average tension across the entire fabric width. This accurate tension feedback allows the PLC controller to respond more quickly and precisely to tension changes, effectively suppressing tension fluctuations and improving the stability and fabric quality of the entire high-tension stretching process.

[0079] Furthermore, the high-tension stretching device for a setting machine proposed in this embodiment also includes a pressing assembly 5, which includes at least one pressing roller 51. The pressing roller 51 is driven by a driving mechanism 52. The driving mechanism 52 can drive the pressing roller 51 to move, so that it can selectively press against or away from at least one traction roller in the device, for example, it can be designed to press against the first traction roller 31.

[0080] In addition, the device is equipped with a separate fabric pressing controller (not shown in the figure). This fabric pressing controller is specifically used to control the operation of the drive mechanism 52. In this embodiment, the fabric pressing controller can be an electrical control box containing manual operation buttons (e.g., electrical on / off buttons) and necessary control elements.

[0081] The key function of the fabric pressing assembly 5 is manifested in specific working conditions where the fabric feed needs to be paused, such as during roll changing operations. In this case, the operator can issue a command through the fabric pressing controller. Upon receiving the command, the fabric pressing controller controls the drive mechanism 52 to actuate, causing the fabric pressing roller 51 to quickly press against its corresponding traction roller (e.g., the first traction roller 31). Because the fabric pressing roller 51 applies pressure to the fabric and the traction roller, sufficient friction is generated, thereby effectively braking the moving fabric.

[0082] At the same time, the PLC controller also receives the stop or deceleration signal and accordingly controls all drive motors to stop rotating or reduce their speed synchronously.

[0083] By coordinating the braking action of the pressure roller 51 with the stop / deceleration of the drive motor, the fabric can maintain the necessary tension in the part entering the device even after the drive motor stops, avoiding fabric loosening, piling, or loss of tension caused by sudden stopping. When the roll change is completed or a restart is required, the pressure roller controller controls the pressure roller 51 to lift, and the PLC controller starts the drive motor, thus resuming normal production.

[0084] Through the coordinated action of the fabric pressing assembly 5 and the PLC controller, a tension-maintaining function is achieved during shutdown. This means that in situations requiring a halt to fabric feeding, such as roll changing, the braking action of the fabric pressing roller 51 effectively maintains the tension of the fabric entering the tensioning device section. This prevents fabric slack, reduces waste during startup, and improves production continuity and stability. Because the tension is maintained, restarting after roll changing or a short stop is faster and smoother, reducing adjustment time.

[0085] Optionally, in this embodiment, the drive mechanism 52 includes a rotating shaft 521, which is mounted and fixed inside the main frame 1, with its axis direction approximately parallel to the axis of the pressure roller 51 to be pressed. At least one lever arm 522 is pivotally connected to or integrally formed at both ends of the rotating shaft 521. The pressure roller 51 is connected to one end or a suitable position of the lever arm 522. The driving force is provided by two cylinders 523. The cylinder body or its fixed end of the cylinder 523 is securely mounted on the inner side walls or other fixed structures of the main frame 1. The piston rod (or its connecting part) of the cylinder 523 is connected to the other end or a suitable position of the corresponding lever arm 522. During operation, the extension or retraction of the cylinder 523 pushes or pulls the lever arm 522, causing the lever arm 522 to swing around the rotating shaft 521, thereby driving the pressure roller 51 connected thereto to press against or away from the traction roller. The solenoid valve (not shown in the figure) used to control the operation of the cylinder 523 is integrated into or contained within the fabric pressing controller (not shown in the figure) described above, or is directly controlled by it. When the fabric pressing controller issues a command, the corresponding electrical signal drives the solenoid valve to operate, thereby precisely controlling the extension and retraction of the cylinder 523, and thus controlling the pressing and separation of the fabric pressing roller 51.

[0086] Furthermore, the high-tension stretching device for a setting machine proposed in this embodiment also includes a fabric feeding guide assembly 6. The fabric feeding guide assembly 6 is integrally disposed at the end of the fabric feeding side of the main frame 1, located on the fabric feeding side of the entire traction roller group (such as the first traction roller 31), and is used to guide and pre-treat the fabric before it enters the main stretching zone.

[0087] The fabric feeding guide assembly 6 comprises two opposing columns 61, which are vertically installed and fixed to both sides of the main frame 1 at the corresponding fabric feeding end, forming the left and right frames of the fabric feeding guide assembly 6. Between the two columns 61, guide rollers 62 are horizontally installed at least at their upper and lower positions. When the fabric enters, it can first pass around the lower guide roller 62 and then around the upper guide roller 62. The order can be reversed according to the actual production design. These guide rollers 62 are used to smoothly guide the fabric into the subsequent roller system.

[0088] A bending roller 63 is provided on the fabric path between the upper and lower guide rollers 62. This bending roller 63 has a specific arc shape and can rotate. In this embodiment, the bending roller 63 is preferably a bent rubber roller to increase friction and protect the fabric.

[0089] During operation, the fabric first enters the feed guide assembly 6, passing sequentially through the guide roller 62 and the bending roller 63. The guide roller 62 defines the fabric's entry path and height, while the bending roller 63's main function is to laterally flatten the fabric, eliminating any wrinkles or creases that may have occurred in previous processes. After pretreatment by the feed guide assembly 6, the fabric can enter the subsequent traction roller area in a flatter and more stable state.

[0090] Furthermore, in this embodiment, the main frame 1 is a robust frame structure that provides the mounting foundation and support for other components of the entire high-tension stretching device. Specifically, the main frame 1 includes two opposing end plates 11. These two end plates 11 are made of robust metal sheet such as steel plate, and their shape and size are designed according to the components that need to be installed internally, such as traction roller bearing seats, motor supports, etc. They form the left and right side walls of the main frame 1, either parallel or opposite to each other.

[0091] To connect the two end plates 11 to form a stable frame structure, multiple crossbeams 12 are connected between the corners of the two end plates 11 or other key stress locations. These crossbeams 12 can be structural steel or steel pipes, and are fixed between the end plates 11 by welding or bolting to enhance the rigidity and structural stability of the entire main frame 1, ensuring that the frame will not deform excessively under high tensile loads.

[0092] Furthermore, to facilitate the installation and fixation of the entire high-tension stretching device onto the base structure of the shaping machine or other equipment, a connecting part 13 is specially provided at the bottom of the outer side of the end plate 11. This connecting part 13 can be designed as a flange with mounting holes, a lug, or a specific interface shape, so that it can be easily and securely fixed and assembled with other structural surfaces by bolts or other fasteners.

[0093] Example 2: This example provides a method for applying high tension to a fabric using the high tension stretching device described in Example 1. The method includes the following main steps:

[0094] Step S0: Before the fabric enters the main stretching zone, the fabric is first guided by the feed guide assembly 6. During this process, the fabric is stably guided by the guide roller 62 and effectively flattened by the bending roller 63 to remove wrinkles, preparing for the subsequent application of uniform tension.

[0095] Step S1: The fabric, after passing through the fabric guide assembly 6, then sequentially passes through the first traction roller 31, the second traction roller 32, and the third traction roller 33 disposed within the main frame 1. These traction rollers transmit traction force by relying on the friction between their surfaces and the fabric.

[0096] Step S2: During the process of the fabric passing through the traction roller, the tension sensing device 2 (specifically, the pressure torque sensing roller described in Example 1) set on the fabric running path is used to detect the current running tension of the fabric in real time, and transmit the detected tension signal to the PLC controller.

[0097] Step S3: The PLC controller receives the real-time tension signal from the tension sensing device 2 and compares it with the target tension value set by the operator or preset in the process program. Based on the comparison result and the internal control algorithm, the PLC controller calculates the target speed of each drive motor (such as the first drive motor 41, the second drive motor 42, and the third drive motor 43) and independently controls the actual speed of these drive motors, so that a precise speed difference is generated between different traction rollers (especially any two adjacent traction rollers). This controlled speed difference acts directly on the fabric, thereby applying, maintaining, or precisely adjusting the tensile tension on the fabric to the target level.

[0098] Step S4: While performing the above tension control, the PLC controller also monitors the running speed of the stenter and controls the overall running speed of the entire high-tension stretching device (which can be achieved by controlling the average speed of all traction rollers or the speed of a certain reference roller) to precisely match the speed of the stenter, ensuring the coordinated operation of the entire production line.

[0099] Optionally, during the normal high-tension stretching of the fabric in steps S1 to S4 described above, if it is necessary to pause the fabric feed, such as when the setting machine needs to change rolls, temporarily stop for inspection, or handle abnormalities, this method further includes:

[0100] Step S5: The operator manually presses the stop / tension hold button on the fabric pressing controller (not shown in the figure), or the production line control system issues an automatic stop signal. Upon receiving the command, the fabric pressing controller immediately controls the drive mechanism 52 of the fabric pressing assembly 5, causing the fabric pressing roller 51 to quickly press against the corresponding traction roller (e.g., the first traction roller 31). The pressure applied by the fabric pressing roller 51 generates sufficient friction between the fabric and the traction roller, thus braking the fabric. Simultaneously, the PLC controller also receives the stop command and immediately controls all drive motors to stop rotating synchronously or reduce their speed to zero according to a preset deceleration curve.

[0101] Thanks to the effective braking of the pressure roller 51, even though the drive motor has stopped providing traction, the fabric tension entering the front section of the high-tension stretching device is maintained at a stable level, preventing the fabric from shrinking, loosening, or piling up.

[0102] When production needs to be resumed, first, the cloth pressing controller controls the cloth pressing roller 51 to lift and release the brake, and then the PLC controller restarts the drive motor, and the large-tension stretching operation of the fabric can be smoothly resumed.

[0103] Furthermore, in the process of executing step S3, this embodiment adopts a progressive adjustment scheme. Specifically, when the tension on the fabric needs to be adjusted from the current first set value (assuming the first set value is T1) to a new second set value (assuming the second set value is T2, and T2 can be greater than or less than T1), the PLC controller does not instantaneously change the speeds of each drive motor to immediately reach the speed difference required to generate the target tension second set value T2.

[0104] Instead, the PLC controller adjusts the relative speeds between the drive motors (such as the first drive motor 41, the second drive motor 42, and the third drive motor 43), and gradually adjusts the speed differences between at least two groups (usually all adjacent ones, such as between the first drive motor 41 and the second drive motor 42, and between the second drive motor 42 and the third drive motor 43) of drive motors. This progressive adjustment allows for step-by-step small adjustments, enabling the tension applied to the fabric to smoothly and continuously transition from the first set value T1 to the second set value T2, achieving a gradual increase (when T2 > T1) or a gradual decrease (when T2 < T1) in tension.

[0105] For example, if the tension needs to be gradually increased from 500N to 2000N, the PLC controller 5 will continuously and finely adjust the speed difference between the second drive motor 42 and the first drive motor 41, and the speed difference between the third drive motor 43 and the second drive motor 42 within a short period of time according to the set change time and internal algorithm, so that the tension in these two intervals rises smoothly until the overall tension reaches and stabilizes at the target value of 2000N. Conversely, reducing the tension also adopts a similar progressive adjustment process.

[0106] The working principle of the present utility model:

[0107] This embodiment provides a large-tension stretching device for a setting machine, aiming to solve the need for precise and large-range tension control of specific fabrics during the setting process. By using at least two groups of traction rollers driven by independent motors, the PLC controller precisely manages the speeds of each roller. By setting and maintaining a specific speed difference between adjacent traction rollers, the tension stretching device can actively and precisely apply the target stretching tension to the running fabric, with an adjustable range as wide as 100N to 10000N.

[0108] To ensure stable tension, this tensioning device is equipped with a tension sensor to monitor the tension on the fabric in real time and feed the signal back to the PLC controller. Based on this feedback and preset target values, the PLC can continuously fine-tune the speed differences between the motors through a closed-loop control algorithm, achieving high-precision constant tension control. The use of three sets of traction rollers creates two independent tension control zones, facilitating segmented or gradual tension adjustment and better adapting to sensitive fabrics or complex processes.

[0109] Meanwhile, the PLC ensures that the overall operating speed of the stretching device is strictly synchronized with the main setting machine. In addition, the fabric feeding guide assembly is responsible for flattening and guiding the fabric, while the fabric pressing assembly provides a stop-and-hold function, which can effectively brake the fabric during pause operations such as roll changing to prevent slack and improve production continuity and stability.

[0110] The above are implementation methods provided in conjunction with specific content, and it is not intended that the specific implementation of this application is limited to these descriptions. Any methods or structures that are similar to those of this application, or any technical deductions or substitutions made based on the concept of this application, should be considered within the scope of protection of this application.

Claims

1. A large tension stretching device for setting machine, comprising a main frame (1), characterized in that, include: At least two sets of traction rollers are provided in the main frame (1) for traction of the fabric along the fabric running path; At least two sets of drive motors are installed on the side of the main frame (1) and are respectively connected to the traction roller for independently driving the corresponding traction roller; Tension sensing device (2) is installed on the fabric running path inside the main frame (1) to detect the running tension of the fabric; The PLC controller is electrically connected to the at least two sets of drive motors and the tension sensing device (2).

2. A large tension stretching device for a setting machine according to claim 1, characterized in that, The traction rollers include a first traction roller (31), a second traction roller (32), and a third traction roller (33) arranged sequentially along the fabric running path; the drive motors include a first drive motor (41), a second drive motor (42), and a third drive motor (43) respectively connected to the first traction roller (31), the second traction roller (32), and the third traction roller (33) for transmission.

3. A large tension stretching device for a setting machine according to claim 1, wherein The tension sensing device (2) is a pressure torque sensing roller installed inside the main frame (1) and parallel to the traction roller.

4. A large tension stretching device for a setting machine according to any one of claims 1 to 3, characterized in that, Also includes: The pressing assembly (5) includes at least one pressing roller (51) and a drive mechanism (52) for driving the pressing roller (51) to press against or away from at least one of the traction rollers. A fabric pressing controller is used to control the drive mechanism (52).

5. A large tension stretching device for a setting machine according to claim 4, wherein The drive mechanism (52) includes a rotating shaft (521) installed in the main frame (1) and parallel to the pressing roller (51). A lever arm (522) is provided between the rotating shaft (521) and the pressing roller (51). A cylinder (523) is connected to the lever arm (522). The cylinder (523) is fixed to one side inside the main frame (1). The pressing controller includes a solenoid valve for controlling the cylinder (523).

6. A large tension stretching device for a setting machine according to claim 1, wherein It also includes a fabric feeding guide assembly (6) located at the side end of the main frame (1), the fabric feeding guide assembly (6) being located on the fabric feeding side of the traction roller.

7. A large tension stretching device for a setting machine according to claim 6, wherein The fabric feeding guide assembly (6) includes two opposing columns (61), which are respectively located on both ends of the main frame (1). A guide roller (62) is provided between the upper and lower parts of the two columns (61), and a bending roller (63) is provided between the two guide rollers (62).

8. The high-tension stretching device for a shaping machine according to claim 7, wherein the bending roller (63) is made of rubber.

9. The high-tension stretching device for a setting machine according to claim 1, wherein the traction roller is made of rubber.

10. A large tension stretching device for a setting machine according to claim 1, wherein The main frame (1) includes two oppositely arranged end plates (11), and a crossbeam (12) is connected between each corner of the two end plates (11). A connecting part (13) is provided at the bottom of the outer side of the end plate (11) for fixed assembly with other structural surfaces.

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