A high-speed loom yarn feeding frame unwinding guide device

Abstract

This invention relates to the field of textile processing technology, and more particularly to a high-speed loom unwinding guide device for a yarn feeding frame, comprising a guide ring and a yarn feeding frame. A transverse beam and a vertical beam are fixedly installed inside the yarn feeding frame. A positioning mechanism for fixing the yarn feeding roller is installed on the surface of the vertical beam. The guide ring is disposed on the upper surface of the transverse beam. This invention achieves dynamic stability of the yarn air ring during high-speed unwinding through an intelligent closed-loop control system. The system integrates a high-speed industrial camera, a tension sensor, and a laser velocimeter to collect real-time data on air ring diameter, tension, and yarn speed. A programmable logic controller (PLC) precisely adjusts the guide ring spacing based on a PID algorithm, ensuring the air ring remains within the ideal diameter range. This significantly reduces yarn vibration and breakage rate, improves weaving efficiency and fabric quality, and also features overspeed braking and tension redundancy calibration functions, ensuring the reliability and safety of high-speed operation.

Description

Technical Field

[0001] This invention relates to the field of textile processing technology, and in particular to a high-speed loom unwinding guide device for the yarn feeding frame. Background Technology

[0002] Unwinding refers to the process of continuously and evenly releasing yarn wound on bobbins, tubes, warp beams, or other packages under external traction according to process requirements. In high-speed looms, unwinding typically occurs at the unwinding frame: the yarn is pulled from the surface of the stationary unwinding roller, gradually peeled off axially, and forms an "air ring" under centrifugal force. It then enters the weaving system through guide rings, tension wheels, and other devices. The quality of unwinding directly affects the yarn tension stability, breakage rate, and final fabric quality.

[0003] In traditional high-speed looms, if the air ring is too large during unwinding, it will cause increased friction between the yarn and surrounding components, sudden tension changes, and thus lead to yarn breakage, fuzzing, and yarn entanglement on the rollers. If the air ring is too small, it will cause the yarn to be over-tensioned, resulting in tensile deformation and a decrease in strength.

[0004] Existing technologies typically employ fixed yarn guide rings or simple mechanical dampers to suppress air pockets. However, these devices have the following shortcomings: First, the fixed position of the yarn guide rings prevents real-time response to dynamic changes in yarn tension and air pocket diameter. Second, the lack of real-time monitoring of yarn speed means that any abnormal speed necessitates a passive shutdown, impacting both production capacity and operational risks. Third, tension adjustment mechanisms are mostly manual or semi-automatic, resulting in low adjustment accuracy and delayed response, making them unsuitable for the high-speed unwinding requirements of modern looms exceeding 10,000 meters per hour. Therefore, there is an urgent need for an unwinding guide device capable of online real-time monitoring of air pocket diameter, yarn tension, and speed, and actively and precisely adjusting the position of the yarn guide rings based on closed-loop control. This would solve the industry problems of air pocket instability, high breakage rates, and large fluctuations in weaving quality during high-speed unwinding. Summary of the Invention

[0005] To achieve the above objectives, the present invention proposes a high-speed loom yarn feeding frame unwinding guide device, comprising a guide ring and a yarn feeding frame. The yarn feeding frame has a horizontal beam and a vertical beam fixedly installed inside. The surface of the vertical beam is equipped with a positioning mechanism for fixing the yarn feeding roller. The guide ring is disposed on the upper surface of the horizontal beam. A mounting plate is fixedly connected to the upper surface of the horizontal beam. A telescopic cylinder for driving the guide ring to move is fixedly connected to the upper surface of the mounting plate. A control component for controlling the extension and retraction of the telescopic cylinder is installed on the surface of the yarn feeding frame.

[0006] The control component includes a detection end and a data processing end. The detection end detects the state of the yarn during unwinding and transmits the detected data to the data processing end. The detection end includes a high-speed industrial camera, a miniature tension sensor, and a laser Doppler velocimeter. The data processing end includes a programmable logic controller. A vertical plate is fixedly connected to the upper surface of the transverse beam. The high-speed industrial camera and the laser Doppler velocimeter are both fixedly mounted on the surface of the vertical plate. The miniature tension sensor is fixedly mounted on the upper surface of the mounting plate. An intelligent control cabinet is fixedly mounted on the front of the yarn feeding frame. The programmable logic controller is installed inside the intelligent control cabinet.

[0007] In one example, the positioning mechanism includes a fixed shaft fixedly mounted on the side of a vertical beam, the central axis of the fixed shaft being aligned with the central axis of the guide ring.

[0008] In one example, a T-shaped groove is formed on the surface of the fixed shaft, a T-shaped positioning strip is slidably connected to the inner wall of the T-shaped groove, and a return spring is fixedly connected to the opposite side of the T-shaped positioning strip and the T-shaped groove.

[0009] In one example, the vertical part of the T-shaped positioning strip is trapezoidal, and a rubber strip is embedded on the upper surface of the T-shaped positioning strip.

[0010] In one example, an adjustment mechanism is installed on the upper surface of the mounting plate. The adjustment mechanism includes an adjustment seat fixedly installed on the upper surface of the mounting plate. A groove is formed on the upper surface of the adjustment seat. A movable seat is slidably installed on the inner wall of the groove. A tension wheel is fixedly connected to the upper surface of the movable seat.

[0011] In one example, there are three tension wheels arranged in a V-shape. A sleeve is fixedly installed on the side of the adjusting seat away from the moving seat. An adjusting rod is slidably installed on the inner wall of the sleeve. The adjusting rod extends into the interior of the groove and is fixedly connected to the surface of the moving seat. An adjusting spring is fixedly connected to the opposite side of the adjusting rod and the sleeve.

[0012] In one example, the control logic executed internally by the programmable logic controller includes:

[0013] Step 1: Data acquisition and preprocessing, used to simultaneously read the real-time diameter of the air bladder, the real-time tension value of the yarn, and the real-time speed value of the yarn;

[0014] Step 2: Speed ​​safety priority monitoring, which compares the real-time speed value with the speed safety threshold. If the threshold is exceeded, the valve adjustment is immediately suspended and the braking command is triggered.

[0015] Step 3: Gas ring stability closed-loop control, which is used to generate control signals through PID control algorithm based on the deviation between the real-time diameter of the gas ring and the preset target diameter;

[0016] Step 4: Signal output and execution, which converts the control signal into an analog output signal and sends it to the electromagnetic proportional valve that is matched with the telescopic cylinder to precisely adjust the position of the guide ring;

[0017] Step 5: Tension-assisted calibration and fault redundancy, used to switch to a control mode that prioritizes tension maintenance in case of abnormal tension or failure of the high-speed industrial camera.

[0018] In one example, the surface of the intelligent control cabinet is embedded with a touch-screen human-machine interface, which is connected to a programmable logic controller to display real-time images of the cylinder, diameter, tension, speed data, current position of the cylinder, and PID parameters, and allows the operator to set target parameters and view alarm information.

[0019] The high-speed loom yarn unwinding guide device proposed in this invention can bring the following beneficial effects:

[0020] 1. This invention achieves dynamic stability of the yarn balloon during high-speed unwinding through an intelligent closed-loop control system. The system integrates a high-speed industrial camera, tension sensor, and laser velocimeter to collect real-time data on balloon diameter, tension, and yarn speed. A programmable logic controller (PLC) uses a PID algorithm to precisely adjust the guide ring spacing, ensuring the balloon remains within the ideal diameter range. This significantly reduces yarn vibration and breakage rate, improves weaving efficiency and fabric quality, and also features overspeed braking and redundant tension calibration functions, ensuring reliability and safety during high-speed operation.

[0021] 2. This invention improves ease of operation and yarn protection performance through a synergistic design of mechanics and materials. The fixed shaft, driven by a spring-loaded T-shaped positioning bar and a beveled guide structure, enables quick insertion and removal of the yarn feeding roller and self-locking fixation, simplifying the replacement process. Both the guide ring and tension wheel are made of smooth ceramic material, effectively reducing yarn friction damage. Combined with the V-shaped distribution of elastic tension wheel sets, it can adaptively adjust yarn stroke and tension fluctuations, further optimizing yarn output stability and reducing maintenance costs. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a first-view structural schematic diagram of a high-speed loom yarn feeding frame unwinding guide device;

[0024] Figure 2 This invention relates to a high-speed loom yarn unwinding guide device. Figure 1 Enlarged structural diagram at point A in the middle;

[0025] Figure 3 This is a schematic diagram of the internal structure of the sleeve of a high-speed loom yarn feeding frame unwinding guide device;

[0026] Figure 4 This invention relates to a high-speed loom yarn unwinding guide device. Figure 1 Enlarged structural diagram at point B;

[0027] Figure 5 This is a schematic diagram of the internal structure of the fixed shaft of a high-speed loom yarn feeding frame unwinding guide device;

[0028] Figure 6 This is a second-view structural diagram of a high-speed loom yarn feeding frame unwinding guide device;

[0029] Figure 7 This invention relates to a high-speed loom yarn unwinding guide device. Figure 6 Enlarged structural diagram at point C;

[0030] Figure 8 This is a flowchart illustrating the internal control logic of a programmable logic controller.

[0031] The attached figures are labeled as follows:

[0032] 1. Guide ring, 2. Yarn feeding frame, 3. Horizontal beam, 4. Vertical beam, 5. Fixed shaft, 6. T-shaped positioning strip, 7. Return spring, 8. Mounting plate, 9. Telescopic cylinder, 10. Adjusting seat, 11. Tension wheel, 12. Moving seat, 13. Sleeve, 14. Adjusting rod, 15. Adjusting spring, 16. High-speed industrial camera, 17. Miniature tension sensor, 18. Laser Doppler velocimeter, 19. Intelligent control cabinet, 20. Programmable logic controller. Detailed Implementation

[0033] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0034] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] like Figures 1 to 8 As shown, the present invention proposes a high-speed loom yarn feeding frame unwinding guide device, including a guide ring 1, which is installed on a yarn feeding frame 2. The yarn feeding frame 2 is equipped with a positioning mechanism for fixing the yarn feeding roller. A transverse beam 3 and a vertical beam 4 are fixedly installed on the yarn feeding frame 2, which are respectively arranged on both sides of the yarn feeding frame 2. The positioning mechanism is installed on the vertical beam 4, and the guide ring 1 is installed on the transverse beam 3 corresponding to the positioning mechanism.

[0039] The positioning mechanism includes a fixed shaft 5 fixedly mounted on a vertical beam 4. A fixing mechanism is installed inside the fixed shaft 5. The diameter of the fixed shaft 5 is smaller than the inner diameter of commercially available yarn feeding rollers, ensuring that the yarn feeding roller can be stably inserted into the fixed shaft 5. A T-shaped groove is formed on the surface of the fixed shaft 5. A T-shaped positioning strip 6 is installed inside the T-shaped groove to press against the inner wall of the yarn feeding roller. A return spring 7 is fixedly connected to the opposite surface of the T-shaped positioning strip 6 and the T-shaped groove. The return spring 7 pushes the surface of the T-shaped positioning strip 6 against the inner wall of the yarn feeding roller to fix the yarn feeding roller. To increase the contact area between the T-shaped positioning strip 6 and the yarn feeding roller, the contact surface is curved. The curved surface of the rubber strip is embedded. Under the elastic force of the return spring 7 and the friction of the rubber strip, the yarn feeding roller can be fixed on the fixed shaft 5, thereby ensuring the fixation of the yarn feeding roller on the yarn feeding frame 2. Since the T-shaped positioning strip 6 protrudes from the fixed shaft 5 under the elastic force of the return spring 7, the yarn feeding roller may not be able to be inserted. The insertion end of the T-shaped positioning strip 6 is set with an inclined surface. When the yarn feeding roller is inserted, it will overlap with the inclined surface of the T-shaped positioning strip 6, and at the same time, a downward force is applied to the T-shaped positioning strip 6. The T-shaped positioning strip 6 will automatically be stored in the T-shaped groove, and the return spring 7 will be squeezed. After the yarn feeding roller is fully inserted, the elastic force of the return spring 7 pushes the T-shaped positioning strip 6 to squeeze the inner wall of the yarn feeding roller for fixation.

[0040] The central axis of the guide ring 1 is the same as the central axis of the fixed shaft 5, thus ensuring that the air ring generated when the yarn is released by the yarn release roller can form a relatively uniform ellipse with the guide hole of the guide ring 1, which facilitates subsequent inspection. When the yarn on the yarn release roller passes through the guide hole of the guide ring 1, the yarn will generate an air ring under the action of centrifugal force during the yarn release, i.e., unwinding process. The air ring is located between the yarn release roller and the guide ring 1. The generation of the air ring is unavoidable, but the length of the yarn when the air ring is formed can be controlled by controlling the distance between the guide ring 1 and the yarn release roller, thereby controlling the size of the air ring. Therefore, the mounting plate 8 is fixedly installed on the upper surface of the transverse beam 3. A telescopic cylinder 9 for moving the guide ring 1 is installed on the upper surface of the mounting plate 8. The telescopic end of the telescopic cylinder 9 is fixedly connected to the side of the guide ring 1. In order to ensure the stability of the force when the guide ring 1 is pushed, a telescopic cylinder 9 is installed symmetrically on the side of the guide ring 1.

[0041] Furthermore, an adjustment mechanism for tension adjustment is installed on the upper surface of the mounting plate 8. The adjustment mechanism includes an adjustment seat 10 fixedly installed on the upper surface of the mounting plate 8. Three tension wheels 11 are slidably installed on the upper surface of the adjustment seat 10. The surface of the tension wheels 11 is provided with a groove. The three tension wheels 11 move autonomously when the yarn is slack, adjusting the spacing to increase or decrease the length of the yarn in the tension wheels 11, thereby achieving the function of controlling the tension. In order to achieve autonomous adjustment of the tension wheels 11, a sliding groove is provided on the upper surface of the adjustment seat 10. A movable seat 12 is slidably installed on the inner wall of the sliding groove. The tension wheels 11 are installed on the upper surface of the movable seat 12. The tension wheels 11 and the guide ring 1 are both made of ceramic and have smooth surfaces. The smooth surface can avoid excessive friction of the yarn.

[0042] Three tension wheels 11 are arranged in a V-shape, and a sleeve 13 is fixedly installed on the side of the adjusting seat 10 away from the moving seat 12. An adjusting rod 14 is slidably installed on the inner wall of the sleeve 13. The adjusting rod 14 extends into the interior of the groove and is fixedly connected to the surface of the moving seat 12. An adjusting spring 15 is fixedly installed between the adjusting rod 14 and the sleeve 13. The yarn is also arranged in a V-shape and closely attached to the tension wheels 11. During unwinding, the yarn will push the tension wheels 11 to move under normal conditions, making the V-shape larger. When the yarn feeding speed slows down, the elasticity of the adjusting spring 15 will push the tension wheels 11 to move, reducing the V-shape angle and increasing the stroke to ensure that the yarn is in a normal state.

[0043] To achieve automatic adjustment of the guide ring 1, i.e., automatic adjustment of the telescopic cylinder 9 to adjust the position of the guide ring 1, a control component for controlling the telescopic cylinder 9 is installed on the yarn feeding frame 2. The control component includes a high-speed industrial camera 16 fixedly installed beside the yarn path between the guide ring 1 and the yarn feeding roller. The high-speed industrial camera 16 is used to acquire images of the yarn air ring in real time and calculate the real-time diameter and stability of the air ring through image processing algorithms. A miniature tension sensor 17 is installed on the yarn path on the exit side of the guide ring 1. The miniature tension sensor 17 is used to monitor the tension change of the yarn in real time. A laser Doppler velocimeter 18 is installed above the yarn path. The laser emitter of the laser Doppler velocimeter 18 is set directly towards the yarn for direct non-contact measurement of the yarn running speed. An intelligent control cabinet 19 is fixedly installed on the front of the yarn feeding frame 2. A programmable logic controller 20 is fixedly installed inside the intelligent control cabinet 19. The high-speed industrial camera 16, the miniature tension sensor 17, and the laser Doppler velocimeter 18 are all electrically connected to the input terminal of the programmable logic controller 20.

[0044] A high-speed industrial camera 16 monitors the diameter of the gas ring in real time, a miniature tension sensor 17 detects the yarn tension, and a laser Doppler velocimeter 18 acquires the yarn speed. The data from these three sources are simultaneously sent to a programmable logic controller 20. The controller first determines whether the speed exceeds the limit. If it does, it brakes immediately. Under normal conditions, the gas ring diameter deviation is converted into an analog signal using a PID algorithm to drive an electromagnetic proportional valve. This precisely controls the telescopic cylinder 9 to adjust the distance between the guide ring 1 and the unwinding roller, ensuring that the gas ring remains at the set diameter. The tension data is also used for redundant calibration. When the visual signal is lost, the tension mode can be automatically switched. This ensures that yarn output with a stable diameter, uniform tension, and safe speed is continuously obtained during high-speed unwinding, significantly reducing yarn breakage and improving weaving efficiency and fabric quality.

[0045] The core control logic executed internally by the programmable logic controller 20 is as follows:

[0046] Step 1: Data Acquisition and Preprocessing

[0047] The programmable logic controller 20 synchronously reads the real-time diameter value of the air ring (D_actual) from the high-speed industrial camera 16, the real-time tension value (T_actual) from the miniature tension sensor 17, and the real-time yarn speed value (V_actual) from the laser Doppler velocimeter 18 at a fixed scanning cycle.

[0048] Step 2: Speed ​​and safety priority monitoring

[0049] The programmable logic controller 20 compares V_actual with the internally stored speed safety threshold (V_max). This is the highest priority control loop. Once V_actual > V_max is detected, the programmable logic controller 20 will immediately suspend all air ring adjustment commands and send the highest priority braking command to the auxiliary drive device or brake of the yarn release roller for forced deceleration. At the same time, an overspeed alarm is triggered on the human-machine interface. This process bypasses the cylinder control until the speed returns to normal.

[0050] Step 3: Closed-loop control of gas circle stability

[0051] When the speed is within a safe range, the system enters the gas ring stability control mode. The programmable logic controller 20 compares the real-time diameter of the gas ring (D_actual) with the preset ideal gas ring target diameter (D_target) and calculates the diameter deviation (e=D_actual-D_target).

[0052] The deviation signal e is calculated using a built-in digital PID control algorithm, ultimately generating an analog output signal for controlling the telescopic cylinder 9. The specific control strategy is as follows:

[0053] Proportional control: Outputs a control quantity that is proportional to the current deviation value e. For example, when the air ring increases significantly in an instant, e is a positive value, and the proportional control will immediately output a strong command to quickly extend the telescopic cylinder 9 to reduce the distance between the guide ring 1 and the unwinding roller, thereby rapidly suppressing the expansion of the air ring.

[0054] Integral control: The output is a control quantity that is proportional to the integral of the deviation (i.e., the cumulative deviation over a period of time). It is used to eliminate static errors. For example, even if the cylinder size is close to the target value but there is still a small, persistent deviation, integral control will gradually increase the output, directing the cylinder to move slowly until the deviation is completely eliminated.

[0055] Differential control: The output is a control quantity that is proportional to the rate of change of the deviation (i.e., the speed at which the deviation changes). It has predictive power. For example, when it detects that the cylinder is rapidly expanding, with e being positive and the rate of change being high, differential control will output an advanced correction signal before the deviation becomes large, instructing the cylinder to extend earlier, effectively suppressing cylinder oscillation and improving system stability.

[0056] The output of the PID algorithm is converted into a corresponding 4-20mA or 0-10V analog signal through the analog output module of the programmable logic controller 20.

[0057] Step 4: Signal Output and Execution

[0058] The analog signal is sent to the electromagnetic proportional valve (instead of a simple on / off solenoid valve) that is paired with the telescopic cylinder 9. The proportional valve precisely and continuously adjusts the flow and direction of compressed air based on the magnitude of the received current or voltage signal.

[0059] When the control algorithm calculates that the cylinder diameter needs to be reduced: the output signal increases, driving the proportional valve to extend the cylinder and reduce the gap.

[0060] When the control algorithm calculates that the cylinder diameter needs to be increased: the output signal decreases, driving the proportional valve to retract the cylinder and increase the gap.

[0061] The magnitude of the signal directly determines the "speed" and "force" of the cylinder's extension and retraction, thereby achieving smooth and precise point control, rather than abrupt extension and retraction, and avoiding secondary disturbance to the yarn.

[0062] Step 5: Tension-assisted calibration and fault redundancy

[0063] The data (T_actual) from the miniature tension sensor 17 serves as an auxiliary calibration for the visual control of the gas ring. The programmable logic controller 20 continuously compares T_actual with the upper and lower tension limits (T_max, T_min). If the system detects that the gas ring diameter is within the target range but the tension is abnormally excessive, or if the high-speed industrial camera 16 temporarily fails, it can automatically switch to a control mode that prioritizes tension maintenance. The tension value is used to infer and adjust the cylinder position, serving as an important fault redundancy backup.

[0064] The surface of the intelligent control cabinet 19 is embedded with a touch-screen human-machine interface. The touch-screen human-machine interface is connected to the programmable logic controller 20 to display the real-time image of the gas cylinder, diameter, tension, speed data, current position of the cylinder and PID parameters, and allows the operator to set D_target, V_max, PID parameters and view alarm information.

[0065] The high-speed loom unwinding guide device provided by this invention achieves active stabilization control of the yarn air ring, adaptive tension adjustment, and safe monitoring of operating speed during high-speed unwinding through deep integration of mechanical structure and intelligent control system. Its core lies in using multiple sensors (high-speed industrial camera 16, miniature tension sensor 17, and laser Doppler velocimeter 18) to collect yarn status in real time, and using a programmable logic controller 20 based on a PID algorithm to achieve closed-loop adjustment of the air ring diameter. Supplemented by tension redundancy calibration and overspeed emergency braking functions, this significantly improves the stability and reliability of yarn unwinding under high-speed, high-frequency operating conditions.

[0066] This device not only effectively suppresses problems such as yarn breakage and roller entanglement caused by excessively large air rings or vibrations, improving weaving efficiency and fabric quality, but also provides key technical support for the efficient and intelligent operation of modern looms through a human-machine interface that allows for parameter setting, status visualization, and fault reporting. Its systematic design and reliable control logic have significant potential for promoting the automation upgrade of textile equipment.

[0067] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0068] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A yarn shedding creel unwinding guide for a high speed loom, comprising a guide ring (1) and a shedding creel (2), characterized in that: The inner part of the yarn releasing frame (2) is respectively fixedly provided with a transverse beam (3) and a vertical beam (4), the surface of the vertical beam (4) is provided with a positioning mechanism for fixing the yarn releasing roller, the guide ring (1) is arranged on the upper surface of the transverse beam (3), the upper surface of the transverse beam (3) is fixedly connected with a mounting plate (8), the upper surface of the mounting plate (8) is fixedly connected with a telescopic cylinder (9) for driving the guide ring (1) to move, and the surface of the yarn releasing frame (2) is provided with a control assembly for controlling the telescopic cylinder (9) to extend and retract; The control assembly comprises a detection end and a data processing end, the detection end detects the state of the yarn during unwinding and transmits the detected data to the data processing end, the detection end comprises a high-speed industrial camera (16), a micro tension sensor (17) and a laser Doppler velocimeter (18), the data processing end comprises a programmable logic controller (20), the upper surface of the transverse beam (3) is fixedly connected with a vertical plate, the high-speed industrial camera (16) and the laser Doppler velocimeter (18) are fixedly arranged on the surface of the vertical plate, the micro tension sensor (17) is fixedly arranged on the upper surface of the mounting plate (8), and the front surface of the yarn releasing frame (2) is fixedly provided with an intelligent control cabinet (19), and the programmable logic controller (20) is arranged in the intelligent control cabinet (19). The control logic executed in the programmable logic controller (20) comprises: Step 1: data acquisition and preprocessing step, for synchronously reading the real-time diameter of the air ring, the real-time tension value of the yarn and the real-time speed value of the yarn; Step 2: speed safety priority monitoring, for comparing the real-time speed value with the speed safety threshold value, if the threshold value is exceeded, the air ring adjustment is immediately paused and the brake instruction is triggered; Step 3: air ring stability closed-loop control, for generating a control signal through a PID control algorithm according to the deviation between the real-time diameter of the air ring and the preset target diameter; Step 4: signal output and execution, for converting the control signal into an analog output signal and sending it to the electromagnetic proportional valve matched with the telescopic cylinder (9), so as to accurately adjust the position of the guide ring (1); Step 5: tension auxiliary calibration and fault redundancy, for switching to a control mode mainly based on tension maintenance when the tension is abnormal or the high-speed industrial camera (16) fails.

2. A yarn frame unwinding guide for a high speed loom according to claim 1, characterized in that: The positioning mechanism comprises a fixed shaft (5) fixedly arranged on the side surface of the vertical beam (4), and the central axis of the fixed shaft (5) is in the same straight line as the central axis of the guide ring (1).

3. A yarn frame unwinding guide for a high speed loom as claimed in claim 2, wherein: A T-shaped groove is formed in the surface of the fixed shaft (5), and a T-shaped positioning strip (6) is slidably connected to the inner wall of the T-shaped groove.

4. A yarn frame unwinding guide for a high speed loom as claimed in claim 3, wherein: The shape of the vertical part of the T-shaped positioning strip (6) is trapezoidal, and a rubber strip is embedded on the upper surface of the T-shaped positioning strip (6).

5. A yarn frame unwinding guide for a high speed loom as claimed in claim 1, wherein: An adjusting mechanism is arranged on the upper surface of the mounting plate (8), the adjusting mechanism comprises an adjusting seat (10) fixedly arranged on the upper surface of the mounting plate (8), a sliding groove is formed in the upper surface of the adjusting seat (10), a moving seat (12) is slidably arranged in the inner wall of the sliding groove, and a tension wheel (11) is fixedly connected to the upper surface of the moving seat (12).

6. A yarn shedding creel unwind guide for a high speed loom as claimed in claim 5 wherein: The number of the tension wheels (11) is three, the three tension wheels (11) are distributed in a V shape, a sleeve (13) is fixedly installed on the surface of the adjusting seat (10) away from one side of the moving seat (12), an adjusting rod (14) is slidably installed on the inner wall of the sleeve (13), the adjusting rod (14) extends to the inside of the sliding groove and is fixedly connected with the surface of the moving seat (12), and the opposite surface of the adjusting rod (14) and the sleeve (13) is fixedly connected with an adjusting spring (15).

7. A yarn frame unwinding guide for a high speed loom as claimed in claim 1, wherein: The intelligent control cabinet (19) is embedded with a touch type man-machine interaction interface, the touch type man-machine interaction interface is in communication connection with the programmable logic controller (20), is used for displaying air ring image, diameter, tension, speed data, air cylinder current position and PID parameter in real time, and provides operator to set target parameter and check alarm information.

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