Elastic yarn tension compensation mechanism

Abstract

The utility model provides an elastic yarn tension compensation mechanism, which relates to the technical field of shuttle looms and comprises two mounting racks, first mounting grooves are symmetrically arranged in the mounting racks, second mounting grooves are arranged at the bottoms of the first mounting grooves, bearing bodies are mounted at the bottoms in the second mounting grooves, belt pulleys are connected to the tops of the bearing bodies, and screw rods are fixed to the tops of the belt pulleys. A pressure sensor is arranged at the inner bottom of a third mounting groove, when the tension compensation roller is subjected to yarn tension, pressure is transmitted to the pressure sensor through a mounting seat and a sliding pressure applying block, and the pressure is transmitted to the pressure sensor through the pressure sensor. And the tension sensor is electrically connected with a controller integrated with a PLC control module, so that real-time accurate tension detection and'detection-feedback-control 'closed-loop automatic adjustment are realized.

Description

Technical Field

[0001] This utility model relates to the field of shuttle loom technology, and in particular to a tension compensation mechanism for elastic yarn. Background Technology

[0002] The shuttle loom is a traditional machine used for weaving woven fabrics, with a long history of development. Its working principle mainly involves a shuttle device that rapidly passes a shuttle carrying weft yarns through a shed formed by warp yarns, after which the warp and weft yarns interweave to form the fabric. The shuttle loom has a relatively complex structure, including several key mechanisms such as shedding, weft insertion, and beat-up. It once held an extremely important position in the textile industry. Although it now faces considerable competition from new shuttleless looms, it still plays an irreplaceable role in the production of certain fabrics and in fields requiring traditional techniques, demonstrating unique weaving value.

[0003] Existing yarn tension compensation mechanisms, such as the novel active yarn tension compensation mechanism disclosed in utility model patent application number 202121927366.5 and authorization announcement number CN215668416U, mainly achieve yarn tension compensation through structures such as a base plate, side rods, a central rod, and a drive unit. Specifically, this mechanism uses a motor to drive a lead screw to rotate, causing the circular plate and the central rod to rise, thereby lifting the middle section of the yarn, increasing the yarn stroke, and thus improving tension.

[0004] However, these existing technologies have obvious shortcomings:

[0005] On the one hand, it cannot detect changes in yarn tension in real time and accurately. Operators can only rely on experience to judge the tension status, which can easily lead to misjudgment, resulting in insufficient or excessive yarn tension, affecting the normal operation of the loom and reducing production efficiency.

[0006] On the other hand, the mechanism adopts an open-loop control method, which adjusts the position of the center rod to compensate for tension by manually operating the motor. This control method is difficult to accurately grasp the start and stop timing and running time of the motor, and cannot dynamically adjust the compensation amount according to real-time tension changes. This results in low accuracy of tension compensation, which is difficult to meet the requirements of high-quality warp knitting production. Furthermore, the consistency of the speed of the two motors depends on a precise motor speed control system. However, if there are differences in motor characteristics, power supply voltage fluctuations, or uneven yarn tension, it is very easy to cause asynchronous rotation of the lead screws on both sides, which in turn causes displacement deviation at both ends of the center rod.

[0007] Therefore, we propose a tension compensation mechanism for elastic yarns. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings of existing technologies. Existing technologies cannot accurately detect yarn tension in real time, rely on experience for judgment which is prone to misjudgment, and use open-loop control to manually adjust the position of the center rod, making it difficult to control the start-stop and running time of the motor, resulting in poor dynamic compensation adjustment. Dual-motor drive is prone to displacement deviation at both ends of the center rod due to inconsistent speeds.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] Elastic yarn tension compensation mechanism, including:

[0011] Two mounting brackets, each mounting bracket having a first mounting groove symmetrically arranged inside the first mounting groove, and a second mounting groove at the bottom of the first mounting groove;

[0012] The bearing body is installed at the bottom of the second mounting slot. The top of the bearing body is connected to a pulley. A screw is fixed to the top of the pulley. The two pulleys are driven by a connecting belt.

[0013] One of the lead screw connections is equipped with a worm gear, which meshes with the worm, and the input end of the worm gear is connected to the drive motor.

[0014] A sliding block is installed in the middle of the two lead screws, and a mounting block is fixed on the sliding block. A third mounting groove is provided inside the mounting block, and sliding limit grooves are opened on both sides of the third mounting groove.

[0015] A pressure sensor is installed at the bottom of the third mounting groove, and the top of the pressure sensor abuts against the sliding pressure block. The sliding pressure block slides in conjunction with the sliding limit groove.

[0016] A fixed mounting base is installed on the top of the sliding pressure block, and a tension compensation roller is installed between the two mounting bases;

[0017] The controller is mounted on the outer wall of the mounting bracket, and a protective cover is fitted on the outer side of the connecting belt.

[0018] When the tension compensation roller is under pressure, the pressure is transmitted to the pressure sensor through the mounting base and the sliding pressure block. The pressure sensor is electrically connected to the controller.

[0019] As a preferred embodiment of this utility model, the two side walls of the sliding pressure block are provided with protrusions that are adapted to the sliding limiting groove, and the groove wall of the sliding limiting groove is provided with a guide groove.

[0020] As a preferred embodiment of this utility model, the two ends of the tension compensation roller are rotatably connected to the mounting base via bearings.

[0021] As a preferred embodiment of this utility model, the controller integrates a PLC control module, the controller is electrically connected to the drive motor, and the signal output terminal of the pressure sensor is connected to the signal input terminal of the controller.

[0022] As a preferred embodiment of this utility model, the inner wall of the sliding block is provided with an internal thread hole that matches the thread of the lead screw, and the sliding block and the lead screw form a lead screw and nut transmission pair.

[0023] As a preferred embodiment of this utility model, the pressure sensor is a resistance strain gauge sensor, and the pressure-bearing surface of the pressure sensor is completely in contact with the bottom surface of the sliding pressure block.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] In this invention, a pressure sensor is installed at the bottom of the third mounting groove. When the tension compensation roller is subjected to yarn tension, the pressure is transmitted to the pressure sensor through the mounting base and the sliding pressure block. The sensor is then electrically connected to the controller with the integrated PLC control module to achieve real-time accurate tension detection and closed-loop automatic adjustment of "detection-feedback-control".

[0026] Furthermore, the structure employs a single-drive motor that drives two lead screws via a worm gear and connecting belt, ensuring synchronous rotation of both lead screws. This, combined with the sliding engagement of the sliding pressure block and the sliding limit groove, prevents deformation of the screws due to uneven force. Designs such as the keyway engagement between the lead screw and the pulley, and the flat key installation of the worm gear ensure accurate transmission. The resistance strain gauge pressure sensor, connected to the tension compensation roller bearing, enhances detection accuracy and reduces friction. A protective cover safeguards the transmission system. The fully automated process requires no manual intervention, maintaining stable yarn tension in real time, reducing loom malfunctions, and improving production efficiency and fabric quality. Attached Figure Description

[0027] Figure 1 A schematic diagram of the main structure of the elastic yarn tension compensation mechanism provided by this utility model;

[0028] Figure 2 A first-view schematic diagram of the transmission structure of the elastic yarn tension compensation mechanism provided by this utility model;

[0029] Figure 3 A second-view schematic diagram of the transmission structure of the elastic yarn tension compensation mechanism provided by this utility model;

[0030] Figure 4 A schematic diagram of the installation of the tension compensation roller in the elastic yarn tension compensation mechanism provided by this utility model.

[0031] Legend: 1. Mounting bracket; 2. First mounting slot; 3. Second mounting slot; 4. Bearing body; 5. Pulley; 6. Lead screw; 7. Connecting belt; 8. Turbine; 9. Worm gear; 10. Drive motor; 11. Sliding block; 12. Mounting block; 13. Third mounting slot; 14. Sliding limit slot; 15. Sliding pressure block; 16. Mounting seat; 17. Tension compensation roller; 18. Controller; 19. Protective cover; 20. Pressure sensor. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0033] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] Example

[0037] like Figure 1-4 As shown, this utility model provides a technical solution: the elastic yarn tension compensation mechanism is mainly composed of two mounting frames 1. These two mounting frames 1 are arranged symmetrically to provide a stable support frame for the entire mechanism. Inside each mounting frame 1, a first mounting groove 2 is symmetrically arranged. The design of the mounting groove lays the foundation for the installation of subsequent components. A second mounting groove 3 is also provided at the bottom of the first mounting groove 2. This layered mounting groove design effectively utilizes the internal space of the mounting frame 1 and provides a reasonable layout for the installation of different functional components.

[0038] A bearing body 4 is installed at the bottom of the second mounting groove 3, and a pulley 5 is connected to the top of the bearing body 4. This connection between the bearing body 4 and the pulley 5 ensures that the pulley 5 can rotate flexibly. A lead screw 6 is fixed to the top of the pulley 5. The two pulleys 5 are connected by a belt 7 to achieve transmission. This transmission design allows power to be transmitted between the two lead screws 6, ensuring the consistency of the movement of the lead screws 6 on both sides. A worm gear 8 is set at the connection of one of the lead screws 6. The worm gear 8 meshes with the worm 9. The input end of the worm 9 is connected to the drive motor 10. This worm gear 8 and worm 9 transmission structure can not only achieve the function of speed reduction and torque increase, but also ensure the smoothness and accuracy of transmission to a certain extent.

[0039] A sliding block 11 is installed in the middle of the two lead screws 6. The inner wall of the sliding block 11 is provided with an internal thread hole that matches the thread of the lead screw 6. In this way, the sliding block 11 and the lead screw 6 form a lead screw nut transmission pair. Through this transmission pair design, when the lead screw 6 rotates, the sliding block 11 can move linearly along the lead screw 6. A mounting block 12 is fixed on the sliding block 11. The mounting block 12 is provided with a third mounting groove 13 inside. Sliding limit grooves 14 are opened on both sides of the third mounting groove 13. The setting of this sliding limit groove 14 provides guidance and limit for the subsequent sliding pressure block 15, ensuring that the sliding pressure block 15 can move in the specified direction.

[0040] A pressure sensor 20 is installed at the bottom of the third mounting groove 13. The pressure sensor 20 is a resistance strain gauge sensor, and its pressure-bearing surface is completely in contact with the bottom surface of the sliding pressure block 15. This contact design ensures that the pressure sensor 20 accurately senses the pressure transmitted from the sliding pressure block 15. The top of the pressure sensor 20 abuts against the sliding pressure block 15. The two side walls of the sliding pressure block 15 are provided with protrusions that are adapted to the sliding limiting groove 14. At the same time, the groove wall of the sliding limiting groove 14 is provided with a guide groove. Through the cooperation of the protrusions and the guide groove, the sliding pressure block 15 can slide smoothly in the sliding limiting groove 14 without deviation during the sliding process, thus ensuring the accuracy of pressure transmission.

[0041] A mounting base 16 is fixed to the top of the sliding pressure block 15. A tension compensation roller 17 is installed between the two mounting bases 16. The two ends of the tension compensation roller 17 are rotatably connected to the mounting base 16 through bearings. This rotatable connection can reduce the friction between the tension compensation roller 17 and the mounting base 16, so that the tension compensation roller 17 can rotate more flexibly, thereby better realizing the compensation effect on yarn tension.

[0042] A controller 18 is installed on the outer wall of the mounting bracket 1. The controller 18 integrates a PLC control module and has powerful data processing and logic control capabilities. The controller 18 is electrically connected to the drive motor 10. At the same time, the signal output terminal of the pressure sensor 20 is connected to the signal input terminal of the controller 18, forming a complete closed-loop control system. In addition, a protective cover 19 is fitted on the outside of the connecting belt 7. The protective cover 19 can effectively prevent dust, debris and other objects from entering the transmission system, protect the normal operation of the transmission system, and extend its service life.

[0043] The elastic yarn tension compensation mechanism senses the changes in yarn tension in real time through the pressure sensor 20, converts the physical pressure signal into an electrical signal and transmits it to the controller 18. After logic operation, the controller 18 outputs a control command to drive the motor 10 to run. Then, through the worm gear 9 and belt transmission system, the screw 6 is driven to rotate, causing the sliding block 11 to drive the tension compensation roller 17 to move, thus realizing the automatic compensation of yarn tension and forming a closed-loop control process of "tension change detection - electrical signal transmission - control command generation - mechanical displacement execution - tension feedback adjustment".

[0044] Signal acquisition and conversion of pressure sensor 20

[0045] Physical pressure transmission path: When the yarn tension changes, the tension compensation roller 17 is subjected to the pressure of the yarn. This pressure is transmitted downward to the sliding pressure block 15 through the mounting base 16. Since the sliding pressure block 15 is in complete contact with the pressure bearing surface of the pressure sensor 20 (the pressure sensor 20 is a resistance strain gauge type, and its sensitive element will deform with pressure), the pressure is accurately transmitted to the pressure sensor 20.

[0046] Electrical signal conversion mechanism: The working principle of the resistance strain gauge pressure sensor 20 is based on the piezoresistive effect. When the pressure surface is subjected to pressure, the resistance value of the strain gauge inside the sensor changes, which in turn causes a change in the output voltage or current signal. This electrical signal has a linear relationship with the yarn tension, realizing the conversion of physical quantity into electrical signal.

[0047] Signal processing and instruction generation of controller 18

[0048] Signal reception and processing: The controller 18 integrates a PLC control module, whose signal input terminal is electrically connected to the pressure sensor 20. It receives the electrical signal transmitted by the pressure sensor 20 in real time. The PLC module first performs preprocessing such as filtering and amplification on the signal to eliminate interference and improve signal stability. Then it compares the signal with a preset tension threshold (set through human-machine interface or program).

[0049] Logic operation and instruction output: If the detected tension signal exceeds or falls below the threshold, the PLC module calculates the required motor rotation direction and speed parameters according to the preset control algorithm (such as PID control), and then sends control instructions (such as PWM pulse signals or relay on / off signals) to the drive motor 10 through the output port. The instructions include information such as motor start / stop, forward / reverse rotation and speed adjustment.

[0050] Power transmission and execution of drive motor 10

[0051] Motor response and power output: After receiving the command from the controller 18, the drive motor 10 adjusts the speed and direction of rotation according to the signal type (such as PWM pulse frequency). For example, when the yarn tension is too high, the controller 18 commands the motor to rotate forward to raise the position of the tension compensation roller 17 and reduce the yarn tension; conversely, the motor rotates in reverse to lower the roller and increase the tension.

[0052] Power transmission of the transmission system: The motor output shaft drives the worm 9 to rotate, and the worm 9 meshes with the turbine 8 (the turbine 8 and worm 9 transmission has self-locking property, which can prevent the mechanism from shifting when the power is off). The turbine 8 drives one of the lead screws 6 to rotate through the keyway connection. The two lead screws 6 achieve synchronous rotation through the connecting belt 7 (the belt transmission ensures the consistency of the speed). The lead screw nut transmission pair formed by the lead screw 6 and the sliding block 11 converts the rotational motion into the linear motion of the sliding block 11.

[0053] Closed-loop feedback mechanism for tension compensation

[0054] Mechanical displacement compensation: When the sliding block 11 moves up and down along the screw 6, it drives the tension compensation roller 17 to rise and fall synchronously through the mounting block 12 and the sliding pressure block 15. When the position of the tension compensation roller 17 changes, the wrap angle and tension of the yarn change accordingly, thereby achieving tension compensation. For example, when the tension is too high, the roller moves up to loosen the yarn, and when the tension decreases, the roller moves down to tighten the yarn.

[0055] Real-time feedback and dynamic adjustment: During the tension compensation process, the pressure sensor 20 continuously monitors new tension changes and transmits the signal back to the controller 18. The controller 18 determines whether further adjustment of the motor operation is needed based on the new feedback signal, forming a closed loop of "detection-control-execution-re-detection" to ensure that the yarn tension is always maintained within the set range.

[0056] Details of key component collaboration

[0057] Transmission synchronization is ensured: The single drive motor 10 drives the double lead screw 6 through the worm gear 9 and the connecting belt 7, avoiding the synchronization error that may occur with dual motor drive. The thread fit accuracy between the sliding block 11 and the lead screw 6 (the internal thread hole is adapted to the thread of the lead screw 6) and the guide groove design between the sliding pressure block 15 and the sliding limit groove 14 (the protrusion fits the groove) ensure that the displacement of the two sides of the mechanism is consistent, and prevents the detection deviation caused by the tilt of the tension compensation roller 17.

[0058] Optimized detection accuracy: The tension compensation roller 17 is rotatably connected to the mounting base 16 at both ends through bearings, which reduces the friction force when the roller rotates, allowing the pressure sensor 20 to more accurately sense the yarn tension (rather than mechanical friction resistance). The pressure-bearing surface of the resistance strain gauge sensor is completely in contact with the sliding pressure block 15, eliminating the signal attenuation caused by the contact gap and improving the detection sensitivity.

[0059] Control logic reliability: The PLC control module can preset multiple tension compensation modes (such as constant tension mode and variable tension mode) and has a fault self-diagnosis function (such as sensor failure alarm and motor overload protection). When the system is abnormal, the controller 18 can automatically cut off the motor power and issue an alarm to ensure the safe operation of the equipment.

[0060] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An elastic yarn tension compensation mechanism, characterized in that, include: Two mounting brackets (1), wherein a first mounting groove (2) is symmetrically provided in the mounting bracket (1), and a second mounting groove (3) is provided at the bottom of the first mounting groove (2); The bearing body (4) is installed at the bottom of the second mounting groove (3). The top of the bearing body (4) is connected to the pulley (5). The top of the pulley (5) is fixed with a screw (6). The two pulleys (5) are driven by a connecting belt (7). One of the lead screws (6) is connected to a worm gear (8), which meshes with the worm (9), and the input end of the worm (9) is connected to a drive motor (10); A sliding block (11) is installed in the middle of the two lead screws (6), and a mounting block (12) is fixed on the sliding block (11). A third mounting groove (13) is provided in the mounting block (12), and sliding limit grooves (14) are opened on both sides of the third mounting groove (13). A pressure sensor (20) is installed at the bottom of the third mounting groove (13). The top of the pressure sensor (20) abuts against the sliding pressure block (15). The sliding pressure block (15) slides in conjunction with the sliding limit groove (14). A fixed mounting base (16) is fixed on the top of the sliding pressure block (15), and a tension compensation roller (17) is installed between the two mounting bases (16); The mounting bracket (1) has a controller (18) mounted on its outer wall and a connecting belt (7) with a protective cover (19) on its outer side. When the tension compensation roller (17) is pressed, the pressure is transmitted to the pressure sensor (20) through the mounting base (16) and the sliding pressure block (15). The pressure sensor (20) is electrically connected to the controller (18).

2. The elastic yarn tension compensation mechanism according to claim 1, characterized in that: The sliding pressure block (15) has protrusions on both sides that are adapted to the sliding limiting groove (14), and the groove wall of the sliding limiting groove (14) is provided with a guide groove.

3. The elastic yarn tension compensation mechanism according to claim 2, characterized in that: The two ends of the tension compensation roller (17) are rotatably connected to the mounting base (16) via bearings.

4. The elastic yarn tension compensation mechanism according to claim 3, characterized in that: The controller (18) integrates a PLC control module. The controller (18) is electrically connected to the drive motor (10), and the signal output terminal of the pressure sensor (20) is connected to the signal input terminal of the controller (18).

5. The elastic yarn tension compensation mechanism according to claim 4, characterized in that: The inner wall of the sliding block (11) is provided with an internal thread hole that is adapted to the thread of the lead screw (6), and the sliding block (11) and the lead screw (6) form a lead screw and nut transmission pair.

6. The elastic yarn tension compensation mechanism according to claim 5, characterized in that: The pressure sensor (20) is a resistance strain gauge sensor, and the pressure-bearing surface of the pressure sensor (20) is completely in contact with the bottom surface of the sliding pressure block (15).

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