Cylinder fabric untwisting and opening mechanism, control method and cylinder opening and water presser

Abstract

The application discloses a cylinder fabric untwisting and opening mechanism, a control method and a cylinder opening and water pressing machine, and relates to the technical field of high-efficiency textile printing and dyeing. The cylinder fabric untwisting and opening mechanism is sequentially arranged with a front roller unit, an untwisting unit and an opening unit according to the advancing direction of the cylinder fabric. The front roller unit is used for inputting a rope-shaped cylinder fabric and comprises a feeding hopper, a front roller shaft and a buffer hopper. The front roller shaft clamps and conveys the cylinder fabric and simultaneously implements water squeezing treatment on the cylinder fabric. The untwisting unit sequentially comprises an untwisting head component, an untwisting wheel component and a detection roller component, and the untwisting head component, the untwisting wheel component and the detection roller component are all assembled on a portal frame. Lifting assemblies are assembled on the left and right sides of the portal frame, the lifting assemblies are connected with the portal frame and the untwisting unit, and drive the untwisting unit to vertically ascend and descend under the control of a control host.

Description

Technical Field

[0001] This invention relates to the field of high-efficiency textile printing and dyeing technology, and in particular to the untwisting and opening mechanism, control method and cylindrical opening water press for cylindrical fabrics. Background Technology

[0002] Cylindrical fabrics typically refer to tubular fabrics knitted by circular knitting machines. In traditional processes, fabrics knitted by circular knitting machines are usually cut into single-layer, wide fabrics before subsequent printing and dyeing operations. However, tubular fabrics have special uses and functions, such as making seamless clothing or specific seamless packaging fabrics, which require retaining the cylindrical structure. At the same time, retaining the cylindrical structure also helps to reduce the width of the fabric and improve the efficiency of subsequent work.

[0003] On the other hand, due to the complex torsional and bending stresses experienced by the yarns during the knitting process of cylindrical fabrics, the greige fabric after coming off the machine exhibits a rope-like twisted shape and accumulates a large amount of internal stress. If it is directly dyed and printed, these internal stresses will be released during the subsequent wet treatment process, resulting in quality problems such as fabric skew, excessive twist, and wrinkles, which seriously affect the quality of the finished product.

[0004] Although some existing rolling dryers integrate untwisting heads, opening devices and impregnation mechanisms, the tension between each unit is mostly controlled by open loop, lacking multi-sensor closed-loop collaborative control based on fabric twisting and edge state, which limits the adaptability to different specifications of cylindrical fabrics; at the same time, the air-expanding components of some equipment are arranged independently of the washing unit, the whole machine occupies a large area, and the coordination between air-expanding and washing extrusion processes is poor. Summary of the Invention

[0005] The purpose of this invention is to provide a detwisting and opening mechanism, control method, and cylindrical opening water press for cylindrical fabrics, which enables precise, efficient, and low-tension pre-treatment operations for dyeing and printing of cylindrical fabrics while maintaining their tubular structure.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: The untwisting and opening mechanism for cylindrical fabrics consists of a front rolling unit, an untwisting unit, and an opening unit arranged sequentially according to the direction of travel of the cylindrical fabric. The front roller unit is used to input rope-shaped cylindrical fabric and includes a feed hopper, a front roller shaft, and a buffer hopper; the front roller shaft clamps and conveys the cylindrical fabric while simultaneously performing a dewatering process on the cylindrical fabric. The untwisting unit includes an untwisting head component, an untwisting wheel component, and a detection roller component in sequence. The untwisting head component, the untwisting wheel component, and the detection roller component are all mounted on the gantry. Lifting components are mounted on the left and right sides of the gantry. The lifting components connect the gantry and the untwisting unit and drive the untwisting unit to make vertical lifting and lowering adjustments under the control of the control host. The untwisting head component includes a trumpet-shaped untwisting drum without a central shaft structure, through which cylindrical fabrics can pass and be conveyed; an untwisting assembly is installed inside the untwisting drum for untwisting rope-like cylindrical fabrics; the rear periphery of the untwisting drum is mounted to a gantry via bearings; an untwisting drum motor is installed on the gantry, which drives the untwisting drum and untwisting assembly to operate at a set speed and in a set direction; Along the fabric conveying flow direction, the opening unit is located downstream of the untwisting unit and is used to receive the untwisted cylindrical fabric, converting the rope-like cylindrical fabric into a flat shape. The opening unit includes a left opening component and a right opening component arranged symmetrically on the left and right sides. The left and right opening components are slidably assembled on the opening slide rail. An opening screw with a left- or right-hand thread structure is provided at the opening slide rail, and an opening screw motor is provided at one end of the opening screw. Both the left and right opening components are provided with sliders that cooperate with the opening screw. The opening screw motor drives the opening screw to rotate, causing the left and right opening components to slide along the opening slide rail, realizing converging or diverging motion.

[0007] Furthermore, the untwisting wheel component includes a horizontally arranged left untwisting wheel, a right untwisting wheel, and an untwisting wheel motor. The left and right untwisting wheels have a symmetrical structure, both being multi-spoke frustum-shaped structures. The spokes of the left and right untwisting wheels are staggered and cross-arranged to form a V-shaped untwisting conveying channel for conveying cylindrical fabrics. The untwisting wheel motor drives the left and right untwisting wheels to rotate synchronously through a central shaft.

[0008] Furthermore, the detection roller component includes a detection roller, the base of which is made of nylon and has a corrugated multi-groove structure on its outer surface. Both ends of the detection roller are connected to a detection roller frame via bearing components, and the detection roller frame is suspended and connected to a gantry. A longitudinal axis is set at the top center of the detection roller frame, and the detection roller frame can swing left and right around the longitudinal axis. A deflection angle sensor is mounted on the longitudinal axis to collect the left and right deflection angle θ between the detection roller frame and the detection roller.

[0009] Furthermore, a contact sensor is arranged on the gantry, which is used to sense whether the roller frame has reached the maximum left and right swing limit position.

[0010] Furthermore, in the flapping unit, both the left flapping assembly and the right flapping assembly include an inner guide wheel and an outer guide wheel. The inner guide wheel and the outer guide wheel have the same size, and the outer edges of the inner guide wheel and the outer guide wheel have a smooth arc-shaped structure. When viewed from above, the inner guide wheel and the outer guide wheel are arranged in a "<" shaped clamping state. An inner guide ring is placed together at the inner guide wheel and the outer guide wheel. The surface of the inner guide ring is smooth and has a non-stick coating structure.

[0011] Furthermore, the minimum distance between the inner guide wheel and the outer guide wheel is greater than the wall thickness of the inner guide ring, and the inner diameter of the inner guide ring is smaller than the outer diameter of the inner guide wheel or the outer guide wheel, while the outer diameter of the inner guide ring is larger than the outer diameter of the inner guide wheel or the outer guide wheel. When the inner guide ring is sleeved outside the inner guide wheel and the outer guide wheel, it is limited by the inner guide wheel and the outer guide wheel, and the inner ring wall of the inner guide ring fits against the "<" shaped space formed by the outer walls of the inner guide wheel and the outer guide wheel.

[0012] Furthermore, tension sensors and infrared reflection sensors are installed on both the left and right opening components; the tension sensors are used to collect the real-time tension of the fabric during the opening operation; the infrared reflection sensors are used to detect whether the edge of the cylindrical fabric has detached from the opening component.

[0013] A control method for an untwisting and opening mechanism of a cylindrical fabric, applied to the untwisting and opening mechanism of the cylindrical fabric, characterized by comprising the following steps: Step S1: The control host acquires the externally input parameters of the cylindrical fabric type, target opening width, reference conveying speed V0, reference rotation speed of the untwisting drum, and conveying speed range parameters V1 and V2 of the untwisting wheel component; the control host calls the corresponding tension control curve according to the fabric type parameters. Step S2: The rope-shaped cylindrical fabric is fed into the front rolling mill unit; the main control unit controls the front rolling mill shaft to operate at the reference conveying speed V0, clamping and conveying the rope-shaped cylindrical fabric input from the feed hopper and squeezing out water; the cylindrical fabric output from the front rolling mill shaft is stacked and temporarily stored in the buffer hopper. Step S3: The cylindrical fabric is conveyed to the untwisting unit; the lifting assembly adjusts the untwisting unit to the highest stroke position; the cylindrical fabric passes through the untwisting drum and is conveyed by the untwisting wheel component at a speed of V0; when the absolute value of the detected deflection angle θ is less than or equal to the set threshold, the untwisting drum remains stationary and the untwisting wheel component continues to convey the cylindrical fabric at V0. Step S4: The cylindrical fabric is conveyed to the opening unit; the cylindrical fabric is clamped and conveyed inside and outside by the inner guide wheel, outer guide wheel and inner guide ring; the movement of the left opening component and the right opening component is controlled to open the cylindrical fabric to the target opening width; Step S5: After being processed by the opening unit, the cylindrical fabric is converted into a flat state and conveyed backward at a reference speed V0 to perform subsequent processes.

[0014] Furthermore, in step S4, the infrared reflection sensor of the left or right opening assembly detects the edge of the cylindrical fabric in real time; if the fabric edge is detected to have detached from the opening assembly, the control host controls the entire machine to stop. In step S3, when the absolute value of the deflection angle θ is greater than the set threshold, the control host controls the untwisting drum motor to drive the untwisting drum to rotate in the same direction as the deflection angle θ at a first speed R1; within a preset time period, if the absolute value of the deflection angle θ is still greater than the set threshold, the untwisting drum motor drives the untwisting drum to rotate in the same direction at a second speed R2, where R2 > R1; During the above operation, if the contact sensor detects that the detection roller frame has reached the maximum swing limit position in the left or right direction, the lifting component drives the untwisting unit to descend from the highest stroke position to the middle stroke position, and the untwisting wheel component runs in the speed range of V1 to V0. When the absolute value of the deflection angle θ falls back to no more than the set threshold, the lifting component drives the untwisting unit to rise from the middle stroke position to the highest stroke position. During the rise, the untwisting wheel component runs in the speed range of V0 to V2.

[0015] A cylindrical fabric opening and pressing machine includes a detwisting and opening mechanism for the cylindrical fabric; a rolling mill unit and a fabric output unit are sequentially arranged downstream of the opening unit along the fabric conveying direction; the rolling mill unit includes a circulating water tank filled with washing water; a set of oppositely arranged air-inflating rollers are arranged above the washing water level in the circulating water tank, and a pressing roller is arranged above the air-inflating rollers. The air-inflating rollers have a hollow structure, with one end connected to a centrifugal fan. The centrifugal fan introduces high-pressure gas into the air-inflating rollers, and an air-blowing port is opened in the middle of the air-inflating rollers, facing the inside of the cylindrical fabric, and high-pressure air is introduced into the inner cavity of the cylindrical fabric, so that the cylindrical fabric is inflated and expanded between the air-inflating rollers and the pressing rollers; after the cylindrical fabric completes washing, inflation and expansion, and squeezing and draining in the rolling mill unit, it is conveyed backward and finally output by the fabric output unit.

[0016] Compared with existing technologies, this solution has the following advantages: This solution arranges the front rolling unit, untwisting unit, and opening unit sequentially according to the direction of travel of the cylindrical fabric. The untwisting unit includes an untwisting head component, an untwisting wheel component, and a detection roller component. The opening unit has symmetrical left and right opening components, enabling coordinated operation of untwisting and opening. An isosceles triangular conveying structure is formed between the untwisting and opening units. This allows the cylindrical fabric to enter the opening unit with a stable tension after untwisting, avoiding quality problems such as weft skew, excessive twist, and wrinkles caused by sudden tension changes. This solution incorporates a deflection angle sensor in the detection roller component of the untwisting unit to acquire the left and right deflection angle values ​​θ of the detection roller frame and the detection roller in real time. Simultaneously, tension sensors are arranged at both the left and right opening components to provide real-time tension feedback during the opening operation. The control host controls the opening screw motor based on the set opening width requirements and the feedback real-time tension value to adjust the real-time spacing between the left and right opening components. This closed-loop tension control method based on real-time detection overcomes the shortcomings of existing equipment where tension control is mostly open-loop, and can adapt to the process requirements of different types of cylindrical fabrics. This solution employs a graded response untwisting control strategy in its control method. Based on the set deflection angle value θ, the untwisting drum motor rotates at the corresponding speed. Through the graded response mechanism, the untwisting force can be dynamically adjusted according to the degree of fabric twisting, effectively eliminating the internal stress accumulated in the cylindrical fabric during the knitting process, while avoiding damage to the fabric caused by excessive untwisting. The present invention has contact sensors arranged on the gantry to detect the maximum left and right swing of the roller frame, and infrared reflection sensors arranged at the left and right opening components to detect whether the edge fabric of the opening is detached; thus, it has a multi-level safety protection mechanism to effectively ensure the reliability of equipment operation.

[0017] The gantry of the present invention is provided with lifting components on the left and right sides, which can adjust the height of the untwisting unit in the vertical direction. Therefore, by changing the height of the untwisting unit, the tension state of the cylindrical fabric between the untwisting unit and the opening unit can be adjusted, further optimizing the tension control effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the cylindrical open-width water press in Example 1.

[0019] Figure 2 This is a simplified structural diagram of a cylindrical open-width water press and a structural diagram of a cylindrical fabric conveying system.

[0020] Figure 3 This is a schematic diagram of the overall structure of the untwisting unit.

[0021] Figure 4 This is a schematic diagram of the untwisting head component.

[0022] Figure 5 This is a schematic diagram of the untwisting wheel component.

[0023] Figure 6 This is a schematic diagram of the structure of the detection roller component.

[0024] Figure 7 This is a schematic diagram of the open-frame unit.

[0025] Figure 8This is a schematic diagram of the left-side opening component.

[0026] Figure 9 A schematic diagram of the arrangement of the inner guide wheel, outer guide wheel, and inner guide ring.

[0027] Figure 10 This is a schematic diagram of the rolling mill unit.

[0028] Figure 11 This is a schematic cross-sectional view of the internal structure of the rolling mill unit.

[0029] Figure 12 This is a schematic diagram of the structure of the air-filled roller. Detailed Implementation

[0030] The specific implementation of this solution will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0031] Example 1: Reference Figure 1 and Figure 2 The untwisting and opening mechanism for cylindrical fabrics consists of a front rolling unit 1, an untwisting unit 2, and an opening unit 3 arranged sequentially according to the direction of travel of the cylindrical fabric. Figure 2 The blue lines represent the conveying path of the cylindrical fabric.

[0032] The front roller unit 1 is used to receive the rope-like cylindrical fabric from the front end. It includes a feed hopper 11, a front roller shaft 12, and a buffer hopper 13. The front roller shaft 12 clamps and conveys the cylindrical fabric. Under the control of the main control unit, the cylindrical fabric can be conveyed at a speed V0 (e.g., 30 m / min). The front roller shaft 12 also performs water squeezing treatment on the cylindrical fabric to squeeze out the liquid remaining at the front end. The cylindrical fabric conveyed by the front roller shaft is stacked in the buffer hopper 13. In order to make the conveying of the cylindrical fabric smoother, an isolation frame 14 is arranged above the opening of the buffer hopper 13 to separate the input path and output path of the rope-like cylindrical fabric at the buffer hopper 13. At the same time, a guide ring 15 is arranged in the output path of the rope-like cylindrical fabric above the buffer hopper 13 to guide the conveying.

[0033] refer to Figures 3 to 6 The untwisting unit 2 includes an untwisting head component 21, an untwisting wheel component 22, and a detection roller component 23. The untwisting head component 21, the untwisting wheel component 22, and the detection roller component 23 are all installed on the gantry 20. Lifting components are arranged on the left and right sides of the gantry 20. The lifting components include a lifting rack 201, a lifting gear 202, a synchronous transmission rod 203, and a lifting drive motor 204. Under the control of the control host, the lifting drive motor 204 drives the lifting gear 202, and under the restriction of the lifting rack 201, it can drive the untwisting unit 2 to perform vertical height adjustment operations.

[0034] The untwisting head component 21 is arranged at an angle towards the buffer hopper 13, so that the cylindrical fabric is kept in a stretched conveying state between the buffer hopper 13 and the untwisting head component 21. In order to facilitate the adjustment of the tilt angle of the untwisting head component 21, the bottom of the untwisting head component 21 is rotatably connected to the gantry 20. An adjusting rod 211 is arranged at the rear end of the untwisting head component 21. The rear end of the adjusting rod 211 has a long waist hole. Therefore, by adjusting the bolts and fixing them at the position of the long waist hole, the tilt angle of the untwisting head component 21 can be adjusted, and the conveying of the cylindrical fabric is smoother.

[0035] The untwisting head component 21 includes a trumpet-shaped untwisting drum 212 with a large outer opening and a small inner opening. The untwisting drum 212 has a structure without a central shaft, allowing the cylindrical fabric to pass through and be conveyed. An untwisting assembly is fixedly installed on the inner wall of the untwisting drum 212. The untwisting assembly consists of three guide rods 214 and three ball-head columns 215 arranged in a central array. The guide rods 214 and ball-head columns 215 are arranged in an alternating manner. When the guide rods 214, ball-head columns 215, and untwisting drum 212 rotate, they can act on the rope-like cylindrical fabric and perform the corresponding untwisting operation. The outer periphery of the rear end of the untwisting drum 212 is mounted with bearings, and a corresponding untwisting drum motor 213 is installed. The untwisting drum motor 213 drives the untwisting drum 212 and the untwisting assembly through a belt drive to rotate at a set speed and direction to perform the corresponding untwisting operation.

[0036] The untwisting wheel component 22 includes a horizontally arranged left untwisting wheel 221, a right untwisting wheel 222, and an untwisting wheel motor 223. The left untwisting wheel 221 and the right untwisting wheel 222 have a symmetrical structure, both of which are multi-spoke frustum-shaped structures. They convey rope-like cylindrical fabrics through inclined spokes 224. The spokes 224 of the left untwisting wheel 221 and the right untwisting wheel 222 are staggered and cross-arranged, forming a V-shaped untwisting and conveying structure for the cylindrical fabric. The untwisting wheel motor 223 drives the left and right untwisting wheels to rotate synchronously through the central shaft 225. Under the control of the control host, the conveying speed is controlled in the range of V1 to V2, where V1≤V0 and V2>V0 (taking V0 as 30 m / min as an example, V1 can be as low as 10 m / min and V2 can be as high as 50 m / min). The left untwisting wheel 221 and the right untwisting wheel 222 convey rope-like cylindrical fabrics through interlaced spokes 224, and have a certain striking function. They are particularly good at conveying and untwisting twisted cylindrical fabrics.

[0037] The detection roller component 23 includes a detection roller 231. The main body of the detection roller 231 is a nylon roller shaft structure. The outer surface of the detection roller 231 is a corrugated multi-grooved roller shaft structure. Both ends are connected to the detection roller frame 232 through bearing components. Therefore, the detection roller 231 can rotate freely with low damping around its central axis. The detection roller frame 232 is connected to the gantry 20 through a hoisting structure. That is, a longitudinal axis 233 is arranged longitudinally at the top center of the detection roller frame 232. During the conveying process of the rope-like cylindrical fabric, due to the stress torsion, it will act on the surface of the detection roller 231 and cause the detection roller frame 232 to swing left and right around the longitudinal axis 233. A deflection angle sensor 234 is arranged on the longitudinal axis 233 to obtain the left and right deflection angle value θ of the detection roller frame 232 and the detection roller 231. Contact sensors 235 are arranged on the left and right sides of the gantry 20 respectively. The contact sensors 235 are used to detect the maximum left and right swing of the roller frame 232.

[0038] To ensure that the rope-like cylindrical fabric is positioned as close as possible to the center of the detection roller 231, a centering mechanism is arranged on the outer side of the detection roller 231. The centering mechanism includes a pair of swing arms 236, the top of which is rotatably connected to the gantry 20. The two swing arms 236 are connected by a set of meshing gears, which keeps the two swing arms 236 in a synchronous opening or closing state. A return spring is connected to the middle of the two swing arms 236, which forces the two swing arms 236 to the center position. A limit rod 237 is arranged at the bottom of each swing arm 236. The limit rod 237 is located below the detection roller 231 and performs left and right clamping operations on the rope-like cylindrical fabric.

[0039] refer to Figures 7 to 9 The opening unit 3 is arranged below the untwisting unit 2 and is used to receive the untwisted cylindrical fabric and perform a structural transformation of the cylindrical fabric from rope-like to flat.

[0040] The opening unit 3 includes a left opening assembly and a right opening assembly arranged symmetrically. The left and right opening assemblies are arranged via an opening slide rail 301. An opening screw 302 with a left and right helical thread structure is arranged at the opening slide rail 301. An opening screw motor is arranged at one end of the opening screw 302. Both the left and right opening assemblies are equipped with sliders that cooperate with the opening screw 302. Therefore, under the drive of the opening screw motor, the left and right opening assemblies can translate along the opening slide rail 301 and enable the left and right opening assemblies to perform convergence or divergence operations. Taking the right-hand opening assembly as an example, it includes an inner guide wheel 303 and an outer guide wheel 304. The inner guide wheel 303 and the outer guide wheel 304 have the same size. The outer edges of the inner guide wheel 303 and the outer guide wheel 304 have a smooth arc-shaped structure. When viewed from above, the inner guide wheel 303 and the outer guide wheel 304 are arranged in a "<" shaped clamping state. An inner guide ring 305 is fitted and arranged at the inner guide wheel 303 and the outer guide wheel 304. The inner guide ring 305 has a smooth surface and a Teflon non-stick coating structure to reduce the friction of the conveying and make the conveying smoother. Specifically, the minimum distance between the inner guide wheel 303 and the outer guide wheel 304 is greater than the wall thickness of the inner guide ring 305, and the inner diameter of the inner guide ring 305 is smaller than the outer diameter of the inner guide wheel 303 or the outer guide wheel 304, while the outer diameter of the inner guide ring 305 is larger than the outer diameter of the inner guide wheel 303 or the outer guide wheel 304. Therefore, when the inner guide ring 305 is placed on the inner guide wheel 303 and the outer guide wheel 304, the inner guide wheel 303 and the outer guide wheel 304 will restrict the inner guide ring 305 and make the inner ring wall of the inner guide ring 305 fit against the "<" shaped space formed by the outer walls of the inner guide wheel 303 and the outer guide wheel 304. In actual arrangement, at the right opening assembly, the inner guide ring 305 is arranged inside the cylindrical fabric, and the inner guide wheel 303 and outer guide wheel 304 are arranged outside the cylindrical fabric. Therefore, one side of the cylindrical fabric can be restricted at the clamping structure of the inner guide wheel 303, outer guide wheel 304 and inner guide ring 305. Similarly, at the left opening assembly, the other side of the cylindrical fabric is clamped. When the cylindrical fabric is conveyed, the inner guide wheel 303, outer guide wheel 304 and inner guide ring 305 rotate synchronously. The rotation speed is consistent with the conveying speed of the cylindrical fabric, and the opening operation of the cylindrical fabric is realized. Therefore, between the untwisting unit 2 and the opening unit 3, the cylindrical fabric forms a conveying structure similar to an isosceles triangle. Tension sensors 306 are arranged at both the left and right opening components to provide feedback on the real-time tension of the left and right opening components on the opening of the cylindrical fabric during the opening operation; the control host controls the opening screw motor according to the set opening width requirement and the feedback real-time tension value, and performs real-time spacing adjustment operation on the left and right opening components. Infrared reflection sensors 307 are arranged at both the left and right opening components. The infrared reflection sensor 307 integrates the transmitter and receiver. A reflector 308 is arranged opposite the infrared reflection sensor 307. The transmitter emits infrared light. When it comes into contact with the fabric, the receiver cannot obtain the signal. Conversely, when there is no fabric between the infrared reflection sensor 307 and the reflector, the infrared light is reflected by the reflector 308 and the receiver can receive the infrared signal. Therefore, it can be used to detect whether the edge fabric of the opening is detached. The corresponding operation can be performed on the whole machine through the control host.

[0041] Example 2: A control method for an untwisting and opening mechanism of a cylindrical fabric, applied to the untwisting and opening mechanism of the cylindrical fabric as described in Example 1, the method comprising the following steps:

[0042] Step S1: The control host receives the user-input parameters of the cylindrical fabric type, target opening width, reference conveying speed V0 (e.g., 30 m / min), reference rotation speed of the untwisting drum, and reference conveying speed range parameters V1 (e.g., 10 m / min) to V2 (e.g., 50 m / min) of the untwisting wheel component, and calls the corresponding tension control curve according to the fabric type parameters; Specifically, the tension control curves corresponding to different types of cylindrical fabrics are stored in the memory of the control host. The control curves for each type of fabric include the tension range of the front rolling unit, the speed adjustment ratio coefficient of the untwisting wheel component, and the target opening width of the opening unit.

[0043] Step S2: The cylindrical fabric is conveyed to the front rolling unit. The main control unit starts the front rolling shaft at a set reference speed V0 to clamp, convey, and dewater the rope-like cylindrical fabric entering the feed hopper. The cylindrical fabric conveyed by the front rolling shaft is stacked in the buffer hopper. Therefore, in this step, the rope-like cylindrical fabric can be pretreated, and its stacking arrangement helps to eliminate the internal stress of the fabric and provides buffer space for subsequent differentiated conveying.

[0044] Step S3: The cylindrical fabric is conveyed to the untwisting unit. The lifting assembly controls the untwisting unit at the highest stroke position. The cylindrical fabric passes through the untwisting drum and is conveyed at the untwisting wheel component at a speed of V0. If the absolute value of the deflection angle θ is less than or equal to the set value, the untwisting drum is kept stationary and the fabric continues to be conveyed at the untwisting wheel component at a speed of V0. Specifically, in this step, a standardized operation process is achieved, that is, the rope-shaped cylindrical fabric itself has already released its twist and bend, and the stretching and release operation can be achieved without untwisting the cylinder; However, if the absolute value of the deflection angle θ is greater than the set value (e.g., ±3°), the untwisting drum motor drives the untwisting drum to rotate in the same direction as the deflection angle θ at a speed of R1 (e.g., 150 rpm). If, within a set time (e.g., 2 seconds), the absolute value of the deflection angle θ is still greater than the set value (e.g., ±3°), the untwisting drum motor drives the untwisting drum to rotate in the same direction as the deflection angle θ at a speed of R2 (e.g., 300 rpm). During this operation, if the contact sensor detects that the roller frame is at its maximum left or right swing, the lifting group... The untwisting unit moves downward from the highest stroke position to the middle position. At this time, the untwisting wheel component operates in the range of V1 to V0 to reduce the conveying speed of the cylindrical fabric and keep the cylindrical fabric in a relatively stable twisted release conveying state, and to make the cylindrical fabric conveyed relatively loosely. After that, if the absolute value of the deflection angle θ is less than or equal to the set value, the lifting component moves the untwisting unit upward from the middle position to the highest stroke position. During this process, the untwisting wheel component operates in the range of V0 to V2, and keeps the cylindrical fabric in a relatively stable conveying state, and finally returns to the standard V0 speed conveying. The key to this solution is that when the rope-like cylindrical fabric is twisted and bent, it acts on the detection roller according to the twisting and bending situation, and causes the detection roller frame to deflect accordingly. The main control unit controls and adjusts the untwisting drum, untwisting wheel component and lifting assembly according to the deflection situation to realize the untwisting operation and finally return to the standardized operation process.

[0045] Step S4: The cylindrical fabric is conveyed to the opening unit. The inner guide wheel, outer guide wheel and inner guide ring clamp and convey the cylindrical fabric from the inside and outside respectively. The left opening assembly and right opening assembly open the cylindrical fabric to the target opening width. In the opening unit, infrared reflection sensors are arranged at the left and right opening components to detect whether the cylindrical fabric is detached at the edge of the opening. If so, the control host will execute an emergency stop of the whole machine and alarm operation. It should be noted that detecting the detached fabric at the edge of the opening has the highest level, that is, once it is determined to be detached, the whole machine must be stopped and subsequent operations cannot be completed.

[0046] Step S5: After the cylindrical fabric passes through the open-width unit, it forms a flat structure and is conveyed at a speed of V0 for subsequent unit processing operations.

[0047] Therefore, under the control of the host, this control method can realize the untwisting and opening operations of cylindrical fabrics, and realize the automated, low-tension, high-precision untwisting and correction and fixed-width opening operations of cylindrical rope fabrics while retaining the tubular structure. It solves the technical defects of traditional equipment such as poor adaptability of open-loop control, incomplete untwisting, easy fabric deviation and shedding, and unstable tension. It is suitable for the pre-treatment processing needs of cylindrical knitted fabrics with different materials, different twists, and different weights.

[0048] Example 3: Reference Figures 10 to 12 A cylindrical fabric opening and pressing machine includes a cylindrical fabric untwisting and opening mechanism as described in Embodiment 1. A rolling mill unit 4 and a spreading output unit 5 are arranged behind the opening unit. The rolling mill unit 4 includes a circulating water tank 41 containing clean water. The flat cylindrical fabric is cleaned by the clean water under the action of the rollers. A set of opposing air-filled rollers 42 are arranged above the clean water level in the circulating water tank 41. A pressing roller 43 is arranged above the air-filled rollers 42. The air-filled rollers 42 have a hollow structure, with one end connected to a centrifugal fan 44 for supplying high-pressure air into the air-filled rollers 42. An air-blowing port 421 is opened in the middle of the air-filled rollers 42 and is arranged against the outer wall of the cylindrical fabric. The air-blowing port 421 is used to blow high-pressure air into the cylindrical fabric. Under the action of the water film of the clean water, the cylindrical fabric forms a balloon-like expanded state between the air-filled rollers 42 and the pressing rollers 43. It enables inflation and expansion operations, and makes the cylindrical fabric conveyor smoother, reducing wrinkles and deviation.

[0049] After the cylindrical fabric is washed, inflated and expanded, and squeezed to drain at the rolling mill unit, the cylindrical fabric is conveyed backward and output at the spreading output unit 5.

[0050] The above embodiments detail the structure, features, and effects of the present invention. The above descriptions are merely preferred embodiments of the present invention. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to achieve the same result, that do not exceed the scope of the specification, should be within the protection scope of the present invention. Although embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations, and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the content disclosed in the embodiments.

Claims

1. A mechanism for untwisting and opening a cylindrical fabric, comprising a front rolling unit, an untwisting unit, and an opening unit arranged sequentially according to the direction of travel of the cylindrical fabric, characterized in that: The front roller unit is used to input rope-shaped cylindrical fabric and includes a feed hopper, a front roller shaft, and a buffer hopper; the front roller shaft clamps and conveys the cylindrical fabric while simultaneously performing a dewatering process on the cylindrical fabric. The untwisting unit includes an untwisting head component, an untwisting wheel component, and a detection roller component, all of which are mounted on a gantry. Lifting assemblies are mounted on the left and right sides of the gantry, connecting the gantry to the untwisting unit and driving the untwisting unit to make vertical lifting and lowering adjustments under the control of the control host. The untwisting head component includes a trumpet-shaped untwisting drum without a central shaft structure, through which cylindrical fabric can pass and be conveyed; an untwisting assembly is installed inside the untwisting drum for untwisting the rope-like cylindrical fabric; the rear end of the untwisting drum is mounted on a gantry via bearings; an untwisting drum motor is installed on the gantry, which drives the untwisting drum and the untwisting assembly to operate at a set speed and in a set direction; Along the fabric conveying flow direction, the opening unit is located downstream of the untwisting unit and is used to receive the untwisted cylindrical fabric and convert the rope-like cylindrical fabric into a flat shape; the opening unit includes a left opening component and a right opening component arranged symmetrically on the left and right. The left and right opening components are slidably mounted on the opening slide rail; The opening slide rail is equipped with an opening screw with a left-right thread structure, and an opening screw motor is installed at one end of the opening screw; both the left opening assembly and the right opening assembly are equipped with sliders that cooperate with the opening screw; The opening screw motor drives the opening screw to rotate, which in turn causes the left and right opening components to slide along the opening slide rail, achieving converging or diverging motion.

2. The untwisting and opening mechanism for cylindrical fabrics according to claim 1, characterized in that: The untwisting wheel component includes a horizontally arranged left untwisting wheel, a right untwisting wheel, and an untwisting wheel motor. The left and right untwisting wheels have a symmetrical structure, both being multi-spoke frustum-shaped structures. The spokes of the left and right untwisting wheels are staggered and cross-arranged to form a V-shaped untwisting conveying channel for conveying cylindrical fabrics. The untwisting wheel motor drives the left and right untwisting wheels to rotate synchronously through a central shaft.

3. The untwisting and opening mechanism for cylindrical fabrics according to claim 1, characterized in that: The detection roller component includes a detection roller, the base of which is made of nylon and has a corrugated multi-groove structure on its outer surface. The two ends of the detection roller are connected to a detection roller frame via bearing components. The detection roller frame is suspended and connected to a gantry. A longitudinal axis is set at the top center of the detection roller frame, and the detection roller frame can swing left and right around the longitudinal axis. A deflection angle sensor is mounted on the longitudinal axis to collect the left and right deflection angle θ between the detection roller frame and the detection roller.

4. The untwisting and opening mechanism for cylindrical fabrics according to claim 1, characterized in that: A contact sensor is arranged on the gantry, which is used to sense whether the roller frame has reached the maximum left and right swing limit position.

5. The untwisting and opening mechanism for cylindrical fabrics according to claim 1, characterized in that: In the flapping unit, both the left flapping assembly and the right flapping assembly include an inner guide wheel and an outer guide wheel. The inner guide wheel and the outer guide wheel have the same size, and the outer edges of the inner guide wheel and the outer guide wheel have a smooth arc-shaped structure. When viewed from above, the inner guide wheel and the outer guide wheel are arranged in a "<" shaped clamping state. An inner guide ring is placed together at the inner guide wheel and the outer guide wheel. The surface of the inner guide ring is smooth and has a non-stick coating structure.

6. The untwisting and opening mechanism for cylindrical fabrics according to claim 5, characterized in that: The minimum distance between the inner guide wheel and the outer guide wheel is greater than the wall thickness of the inner guide ring, and the inner diameter of the inner guide ring is smaller than the outer diameter of the inner guide wheel or the outer guide wheel, while the outer diameter of the inner guide ring is larger than the outer diameter of the inner guide wheel or the outer guide wheel. When the inner guide ring is sleeved outside the inner guide wheel and the outer guide wheel, it is limited by the inner guide wheel and the outer guide wheel, and the inner ring wall of the inner guide ring fits against the "<" shaped space formed by the outer walls of the inner guide wheel and the outer guide wheel.

7. The untwisting and opening mechanism for cylindrical fabrics according to claim 5, characterized in that: Tension sensors and infrared reflection sensors are installed on both the left and right opening components; the tension sensors are used to collect the real-time tension of the fabric during the opening operation; the infrared reflection sensors are used to detect whether the edge of the cylindrical fabric has detached from the opening component.

8. A method for controlling the untwisting and opening mechanism of a cylindrical fabric, applied to the untwisting and opening mechanism of the cylindrical fabric as described in any one of claims 1 to 7, characterized in that: Includes the following steps: Step S1: The control host acquires the externally input parameters of the cylindrical fabric type, target opening width, reference conveying speed V0, reference rotation speed of the untwisting drum, and conveying speed range parameters V1 and V2 of the untwisting wheel component; the control host calls the corresponding tension control curve according to the fabric type parameters. Step S2: The rope-shaped cylindrical fabric is fed into the front rolling mill unit; the main control unit controls the front rolling mill shaft to operate at the reference conveying speed V0, clamping and conveying the rope-shaped cylindrical fabric input from the feed hopper and squeezing out water; the cylindrical fabric output from the front rolling mill shaft is stacked and temporarily stored in the buffer hopper. Step S3: The cylindrical fabric is conveyed to the untwisting unit; the lifting assembly adjusts the untwisting unit to the highest stroke position; the cylindrical fabric passes through the untwisting drum and is conveyed by the untwisting wheel component at a speed of V0; when the absolute value of the detected deflection angle θ is less than or equal to the set threshold, the untwisting drum remains stationary and the untwisting wheel component continues to convey the cylindrical fabric at V0. Step S4: The cylindrical fabric is conveyed to the open-width unit; The cylindrical fabric is clamped and conveyed inside and outside by the inner guide wheel, outer guide wheel, and inner guide ring; the movement of the left opening assembly and the right opening assembly is controlled to open the cylindrical fabric to the target opening width; Step S5: After being processed by the opening unit, the cylindrical fabric is converted into a flat state and conveyed backward at a reference speed V0 to perform subsequent processes.

9. The control method for the untwisting and opening mechanism of a cylindrical fabric according to claim 8, characterized in that: In step S4, the infrared reflection sensor of the left or right opening assembly detects the edge of the cylindrical fabric in real time; if the fabric edge is detected to have detached from the opening assembly, the main control unit stops the entire machine. In step S3, when the absolute value of the deflection angle θ is greater than the set threshold, the control host controls the untwisting drum motor to drive the untwisting drum to rotate in the same direction as the deflection angle θ at a first speed R1; if the absolute value of the deflection angle θ is still greater than the set threshold within a preset time period, the untwisting drum motor drives the untwisting drum to rotate in the same direction at a second speed R2, where R2 > R1; During the above operation, if the contact sensor detects that the detection roller frame has reached the maximum swing limit position in the left or right direction, the lifting component drives the untwisting unit to descend from the highest stroke position to the middle stroke position, and the untwisting wheel component runs in the speed range of V1 to V0. When the absolute value of the deflection angle θ falls back to no more than the set threshold, the lifting component drives the untwisting unit to rise from the middle stroke position to the highest stroke position. During the rise, the untwisting wheel component runs in the speed range of V0 to V2.

10. A cylindrical open-width water press, characterized in that: The invention includes a detwisting and opening mechanism for cylindrical fabrics as described in any one of claims 1 to 7; a rolling mill unit and a fabric output unit are sequentially arranged downstream of the opening unit along the fabric conveying direction; the rolling mill unit includes a circulating water tank filled with washing water; a set of oppositely arranged air-inflating rollers are provided above the washing water level in the circulating water tank, and a pressure roller is provided above the air-inflating rollers; the air-inflating rollers are hollow, with one end connected to a centrifugal fan, which introduces high-pressure gas into the air-inflating rollers; an air-blowing port is opened in the middle of the air-inflating rollers, facing the inside of the cylindrical fabric, and high-pressure air is introduced into the inner cavity of the cylindrical fabric, so that the cylindrical fabric is inflated and expanded between the air-inflating rollers and the pressure rollers; after the cylindrical fabric is washed, inflated and expanded, squeezed and drained in the rolling mill unit, it is conveyed backward and finally output by the fabric output unit.

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