Warp tension adjusting device and loom

Abstract

The present application relates to the technical field of textile equipment, and discloses a warp tension adjusting device, which comprises a left swing mechanism, a right swing mechanism, a warp loosening roller and a pressure sensing device; the left swing mechanism and the right swing mechanism are respectively arranged on the warp feeding wall plates on the left and right sides of a loom and can rotate back and forth along the conveying direction of the warp; and the two ends of the warp loosening roller are respectively arranged on the left swing mechanism and the right swing mechanism to convey and lift the warp. The warp tension adjusting device can timely detect the change of the warp tension and timely and effectively adjust the warp tension by arranging the warp loosening roller on the left swing mechanism and the right swing mechanism.

Description

Technical Field

[0001] This invention relates to the field of textile equipment technology, specifically to a warp tension adjusting device and a weaving machine. Background Technology

[0002] Existing warp tension adjusting devices include guide rollers, back beam rollers, and connecting arms. The roller shaft of the back beam roller is fixedly connected to the rotating shaft of the guide roller via the connecting arm. In operation, the back beam roller conveys and supports the warp yarns. When the warp tension changes, the warp yarns exert an additional force on the back beam roller. This force generates a torque on the rotating shaft of the guide roller, causing it to rotate. As the guide roller rotates, it sends a signal to the control device of the warp beam drive. Upon receiving the signal, the control device controls the rotational speed of the drive output shaft, thereby changing the rotational speed of the warp beam accordingly, and the warp tension quickly returns to normal. However, existing warp tension adjustment devices may exhibit a phenomenon where changes in warp tension do not cause the guide roller shaft to rotate. This is because the direction of the force exerted on the back beam roller when the warp tension changes is uncertain. Once the direction of the warp tension force is nearly parallel to the connecting arm, the torque it generates on the guide roller shaft will be very small, thus failing to drive the guide roller shaft to rotate or only causing it to rotate a very small angle. This results in the control device being unable to accurately adjust the speed of the weaving beam, ultimately causing the warp tension to fail to return to normal in a timely manner, thus affecting product quality. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned problems existing in the prior art and provide a warp tension adjusting device that can detect changes in warp tension in a timely manner and make timely and effective adjustments to the warp tension, thereby ensuring product quality.

[0004] To achieve the above objectives, the present invention provides a warp tension adjusting device, comprising a left swing mechanism, a right swing mechanism, a warp release roller, and a pressure sensing device; the left swing mechanism and the right swing mechanism are respectively disposed on the warp feed wall plates on the left and right sides of the loom and can rotate back and forth along the warp feed direction; the two ends of the warp release roller are respectively disposed on the left swing mechanism and the right swing mechanism for conveying and supporting the warp, and can drive the left swing mechanism and the right swing mechanism to rotate forward or backward when the warp tension on the warp release roller changes; the pressure sensing device is connected to the control device of the loom, and the pressure sensing device is configured to sense the forward or backward swing of the left swing mechanism and the right swing mechanism and transmit the signal to the control device; after receiving the signal from the pressure sensing device, the control device controls the rotation speed of the loom's warp beam to restore the warp tension to normal.

[0005] In an optional embodiment of the present invention, the left swing mechanism and the right swing mechanism are basically the same in structure and each includes: a fixed shaft, a rocker arm, and a limiting mechanism; the fixed shaft is fixed to the warp feed wall plate on the same side, and the fixed shaft is parallel to the axis of the warp release roller; the rocker arm is rotatably disposed on the fixed shaft; the axis of the warp release roller is disposed on the rocker arm and located directly above the axis of the fixed shaft; the limiting mechanism is fixed to the warp feed wall plate on the same side to limit the swing amplitude of the rocker arm.

[0006] In an optional embodiment of the present invention, the limiting mechanism includes an upper limiting member, a lower limiting member, and a limiting shaft; the limiting shaft is fixed between the upper limiting member and the lower limiting member; a limiting hole is provided on the first end of the rocker arm away from the fixed shaft for the limiting shaft to pass through.

[0007] In an optional embodiment of the present invention, the limiting mechanism further includes a loosening spring, which is vertically disposed on the limiting shaft and located between the rocker arm and the lower limiting member or between the rocker arm and the upper limiting member. The end of the loosening spring away from the rocker arm is provided with the pressure sensing device to transmit the extension force of the loosening spring to the control device.

[0008] In an optional embodiment of the present invention, the limiting mechanism further includes an upper limit spring and a lower limit spring, the upper limit spring being located between the rocker arm and the upper limit member, and the lower limit spring being located between the rocker arm and the lower limit member; the pressure sensing device is provided at the ends of both the lower limit spring and the upper limit spring.

[0009] In an optional embodiment of the present invention, an upper adjusting sleeve and a lower adjusting sleeve pass through the limiting shaft. The limiting shaft is fixed on the upper limiting member. The upper adjusting sleeve is threadedly connected to the limiting shaft. The lower adjusting sleeve includes a threaded outer ring and a threaded inner ring, which are threadedly connected. Both the threaded outer ring and the threaded inner ring surround the limiting shaft. The upper adjusting sleeve is located between the upper limiting spring and the upper limiting member, and the lower adjusting sleeve is located between the lower limiting spring and the lower limiting member.

[0010] In an optional embodiment of the present invention, a distance measuring device is installed on the warp feed wall plate. The distance measuring device includes: a mounting base, a first distance sensor, and a second distance sensor. The mounting base is installed on the warp feed wall plate in a horizontal direction. The first distance sensor and the second distance sensor, which are spaced apart in the horizontal direction, are installed on the mounting base. The first distance sensor is used to detect the distance d1 between the rocker arm and the mounting base, and the second distance sensor is used to detect the distance d2 between the rocker arm and the mounting base. The output terminals of the first distance sensor, the second distance sensor, and the pressure sensing device are all connected to a tension monitoring device. The pressure sensing device is located between the lower adjusting sleeve and the lower limit member. The pressure sensing device is used to detect the real-time pressure F1 of the rocker arm, the lower limit spring, and the lower adjusting sleeve. The tension monitoring device is used to calculate the tension F2 of the loosening roller based on the distance d1, the distance d2, and the real-time pressure F1.

[0011] In an optional embodiment of the present invention, calculating the tension F2 of the loosening roller based on the corrected pressure F5 includes the following steps:

[0012] S1. Obtain test data, including the following steps: S311. Test preparation: An annular pressure sensor is installed on the warp release roller, and the outer diameter of the annular pressure sensor is equal to the outer diameter of the middle part of the warp release roller; S312. The warp tension adjustment device is working normally, and the warp yarns pass around the outer walls of both the warp release roller and the annular pressure sensor. During the process, the annular pressure sensor outputs test pressure F6, and the pressure sensing device obtains real-time pressure F1. At the same time, the first distance sensor and the second distance sensor obtain distance d1 and distance d2 respectively; S313. Replace the annular pressure sensor with a warp release ring, the outer diameter of which is equal to the outer diameter of the annular pressure sensor, and the weight of the warp release ring is equal to that of the annular pressure sensor; S314. End the experiment;

[0013] S2. Calculate the distance-based predicted pressure F0 based on distances d1 and d2;

[0014] S3. Obtain the corrected pressure F5 based on the distance-based predicted pressure F0 and the real-time pressure F1;

[0015] S4. Calculate the tension F2 of the loosening roller (2), F2=a+bF5+cF5 2 +dF5 3 (Formula 1) In Formula 1, a, b, c, and d are constants. We use F6 to substitute into F2 in Formula 1 and use a regression model to obtain a, b, c, and d.

[0016] In an optional embodiment of the present invention, the rocker arm is provided with a through hole for the limiting shaft to pass through, the diameter of the through hole is larger than the diameter of the limiting shaft, and the distance between the center line of the through hole on the rocker arm and the center line of the fixed shaft is L0. The calculation of the distance-based predicted pressure F0 based on the distance d1 and the distance d2 in step S2 includes the following steps:

[0017] S21. Calculate the angle α between the rocker arm and the horizontal direction. d0 is the distance between the first distance sensor and the second distance sensor;

[0018] S22. Calculate the distance h0 that the perforation position in the rocker arm lowers or rises.

[0019] S23. Calculate the elastic force F3 exerted by the upper limit spring on the rocker arm. F3 = k1 * [L1 - (h1 - h0)], where k1 is the elastic coefficient of the upper limit spring, L1 is the natural elongation length of the upper limit spring, and h1 is the height of the upper limit spring when the rocker arm is in the horizontal direction.

[0020] S24. Calculate the spring force F4 exerted by the lower limit spring on the rocker arm. F4 = k2 * [L2 - (h2 - h0)], where k2 is the spring constant of the lower limit spring, L2 is the natural elongation of the lower limit spring, and h2 is the height of the lower limit spring when the rocker arm is in the horizontal direction.

[0021] S25. Distance-based predicted pressure F0 = F4 + M1 + M2, where M1 is the weight of the lower adjusting screw sleeve and M2 is the weight of the lower limit spring.

[0022] The present invention also provides a weaving machine, including the warp tension adjusting device described in any one of the above-mentioned methods and warp feed wall plates disposed on the left and right sides of the weaving machine, wherein the two ends of the warp tension adjusting device are respectively disposed on the warp feed wall plates on the left and right sides.

[0023] This invention's warp tension adjusting device directly mounts the warp release roller on the left and right oscillating mechanisms. When the tension of the warp yarn passing through the warp release roller changes, it immediately causes the left and right oscillating mechanisms to swing forward or backward. This triggers a pressure sensor to transmit the oscillation information to the control device, allowing the control device to promptly adjust the warp beam speed to quickly restore the warp tension to normal. Furthermore, since the warp yarn is conveyed from top to bottom through the warp release roller, any change in warp tension will cause the warp release roller to drive the left and right oscillating mechanisms to swing forward or backward, avoiding the problem in existing technologies where changes in warp tension cannot be promptly transmitted to the control device. This invention's warp tension adjusting device not only promptly detects changes in warp tension and makes timely and effective adjustments to ensure product quality, but also has a simpler structure, eliminating the need for guide rollers in existing technologies and effectively reducing production costs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a warp tension adjustment device provided in Embodiment 1 of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure of a warp tension adjustment device provided in Embodiment 2 of the present invention.

[0027] Figure 3 This is a front view of a warp tension adjusting device provided in Embodiment 2 of the present invention.

[0028] Explanation of reference numerals in the attached figures

[0029] 1 Right swing mechanism, 10 Fixed shaft, 11 Rocker arm, 12 Limiting mechanism, 121 Upper limit component, 122 Lower limit component, 123 Upper limit spring, 124 Lower limit spring, 2 Loosening roller, 3 Pressure sensing device, 4 Warp feeding wall plate, 51 Upper adjusting screw sleeve, 52 Lower adjusting screw sleeve, 521 Threaded outer ring, 522 Threaded inner ring, 61 First distance sensor, 62 Second distance sensor, 7 Loosening ring. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0033] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0034] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment of the invention provides a warp tension adjustment device, including a left swing mechanism, a right swing mechanism 1, a warp release roller 2, and a pressure sensing device 3. The left swing mechanism and the right swing mechanism 1 are respectively disposed on the warp feed wall plates 4 on the left and right sides of the loom and can rotate back and forth along the warp feed direction. The two ends of the warp release roller 2 are respectively disposed on the left swing mechanism and the right swing mechanism 1 for conveying and supporting the warp, and can drive the left swing mechanism and the right swing mechanism 1 to rotate forward or backward when the warp tension on the warp release roller 2 changes. The pressure sensing device 3 is connected to the control device of the loom's transmission device. The pressure sensing device 3 is configured to sense the forward or backward swing of the left swing mechanism and the right swing mechanism 1 and transmit the signal to the control device. After receiving the signal from the pressure sensing device 3, the control device controls the rotation speed of the loom's warp beam to restore the warp tension to normal.

[0037] In this embodiment, the left swing mechanism and the right swing mechanism 1 only need to be able to rotate back and forth along the warp yarn feeding direction and be respectively arranged on the left and right sides of the warp feed wall plate 4. Existing looms all include warp feed wall plates located on the left and right sides. The warp feed wall plate 4 here is the same as the warp feed wall plate in the prior art, and will not be described in detail here.

[0038] In this embodiment, the installation position of the loosening roller 2 is the same as that of the rear beam roller of the loom in the prior art, which is used to lift and transport the warp yarns.

[0039] In this embodiment, the pressure sensing device 3 can be various sensors, such as force sensors, photoelectric sensors, etc., as long as they can sense the forward or backward swing amplitude of the left and right swing mechanisms 1 and 1' and transmit the signal to the control device connected to them.

[0040] In this embodiment, the control device is a transmission mechanism including the warp beam of the loom, used for starting, stopping, and adjusting the speed, etc.

[0041] During production, when the warp release roller 2 is conveying the warp yarn output from the loom beam, if the warp yarn tension changes, the entire warp release roller 2 will be subjected to a forward or backward pulling force. Since the two ends of the warp release roller 2 are respectively set on the left swing mechanism and the right swing mechanism 1, when the two ends of the warp release roller 2 generate a forward or backward rotational motion tendency under the action of warp yarn tension, it will drive the left swing mechanism and the right swing mechanism 1 to rotate forward or backward. When the left swing mechanism and the right swing mechanism 1 rotate forward or backward, it will trigger the pressure sensor 3. The pressure sensor 3 will transmit the received data to the control device. The control device will analyze the data and adjust the speed of the loom beam accordingly so that the warp yarn tension can be quickly restored to normal. The warp tension adjusting device of the present invention eliminates the guide rollers used in the prior art, thus avoiding obstruction to the disassembly and assembly of the warp beam. It also eliminates the need for the back-and-forth movement of the guide rollers and the connecting back beam rollers required when replacing the warp beam. The warp tension adjusting device of the present invention directly mounts the loosening roller on the left and right oscillating mechanisms. When the tension of the warp yarn passing through the loosening roller changes, it immediately causes the left and right oscillating mechanisms to swing forward or backward, thereby triggering the pressure sensing device to transmit the oscillation information to the control device. This allows the control device to promptly adjust the warp beam speed to quickly restore the warp tension to normal. Furthermore, since the warp yarn is conveyed from top to bottom through the loosening roller, any change in warp tension will cause the loosening roller to drive the left and right oscillating mechanisms to swing forward or backward, avoiding the problem in the prior art where changes in warp tension cannot be promptly transmitted to the control device. The warp tension adjustment device of the present invention directly sets the loosening roller on the left and right swing mechanism, which can not only detect changes in warp tension in time and make timely and effective adjustments to the warp tension to ensure product quality, but also has a simpler structure, eliminating the guide roller in the prior art, improving the work efficiency of changing warp beams, and reducing production costs.

[0042] Optionally, to facilitate processing and make the structure simpler and more practical, the left swing mechanism and the right swing mechanism 1 can be designed to be basically the same, each including: a fixed shaft 10, a rocker arm 11, and a limiting mechanism 12; the fixed shaft 10 is fixed to the warp feed wall plate 4 on the same side, and the fixed shaft 10 is parallel to the axis of the loosening roller 2; the rocker arm 11 is rotatably mounted on the fixed shaft 10; the axis of the loosening roller 2 is located on the rocker arm 11 and directly above the axis of the fixed shaft 10; the limiting mechanism 12 is fixed to the warp feed wall plate 4 on the same side to limit the swing amplitude of the rocker arm 11. When the warp tension on the loosening roller 2 changes, since the loosening roller 2 is located on the rocker arm 11 and above the fixed shaft 10, the loosening roller 2 will tend to rotate forward or backward along the warp feed direction under the action of the warp tension change, thereby driving the rocker arm 11 mounted on the fixed shaft 10 to rotate forward or backward. At this time, the limiting mechanism 12 fixed to the warp feed wall plate 4 is used to limit the rotation amplitude of the rocker arm 11 to prevent its rotation angle from being too large. The rotation angle of the rocker arm 11 should be limited to the range that can be sensed by the pressure sensor 3. Do not rotate it too much to avoid the rocker arm not resetting in time.

[0043] Furthermore, to limit the rotation amplitude of the rocker arm 11 and make its rotation more stable, the limiting mechanism 12 includes an upper limiting member 121, a lower limiting member 122, and a limiting shaft (not shown in the figure); the limiting shaft is fixed between the upper limiting member 121 and the lower limiting member 122; a limiting hole is provided on the first end of the rocker arm 11 away from the fixed shaft 10 for the limiting shaft to pass through. In this way, the upper limiting member 121 and the lower limiting member 122 effectively limit the vertical rotation amplitude of the rocker arm 11, while the limiting shaft can also circumferentially limit the rocker arm 11, preventing the rocker arm 11 from circumferentially moving due to machine vibration or other external forces, effectively ensuring that the rocker arm can rotate stably up and down when the warp tension changes. Specifically, the limiting hole on the rocker arm 11 for the limiting shaft to pass through can be designed as a waist-shaped hole extending along the warp conveying direction, thereby effectively preventing the rocker arm 11 from being stuck by the limiting shaft.

[0044] In addition, in order to buffer the impact of the rocker arm 11 on the upper limit member 121 and the lower limit member 121 when it rotates and swings, the limiting mechanism 12 can be designed with various structures. The following two embodiments are listed as preferred methods. In specific implementation, the preferred method can be selected according to the actual needs.

[0045] The first embodiment of the limiting mechanism 12 is as follows: The limiting mechanism 12 further includes a warp release spring (not shown in the figure). The warp release spring is vertically arranged on the limiting shaft and located between the rocker arm 11 and the lower limiting member 122 or between the rocker arm 11 and the upper limiting member 121. A pressure sensing device 3 is provided at the end of the warp release spring away from the rocker arm 11 to transmit the tension and extension force of the warp release spring to the control device. Specifically, the warp release spring is placed vertically and the limiting shaft passes through it. One end of the warp release spring is connected to the lower limiting member 122 or the upper limiting member 121, and the other end of the warp release spring is connected to the rocker arm 11. In this way, when the rocker arm 11 swings due to the change in warp tension, it will pull or compress the warp release spring. The pressure sensing device 3 installed at the end of the warp release spring away from the rocker arm will promptly sense the tension or compression force of the spring and transmit it to the control device to adjust the warp beam speed in time so that the warp tension can be quickly restored to normal.

[0046] A second embodiment of the limiting mechanism 12 includes an upper limiting spring 123 and a lower limiting spring 124. The upper limiting spring 123 is located between the rocker arm 11 and the upper limiting member 121, and the lower limiting spring 124 is located between the rocker arm 11 and the lower limiting member 122. A pressure sensing device 3 is provided at the end of the lower limiting spring 124. To reduce the influence of gravity, the upper limiting spring 123 and the lower limiting spring 124 are configured to always be in a compressed state during operation. In this embodiment, when the rocker arm 11 swings back and forth, the pressure sensing device located at the end of the lower limiting spring 124 will promptly sense the pressure change from the rocker arm 11 and transmit the information to the control device to adjust the warp tension in a timely manner.

[0047] Furthermore, to accurately detect the tension change as soon as it begins to change, the two ends of the feed roller 2 are respectively mounted on the rocker arm 11 on the same side via connecting plates. The connecting plates are elongated strips extending along the warp conveying direction and are symmetrically arranged about the fixed axis 10. Thus, when the warp tension begins to change slightly, the feed roller 2 can increase its rotational torque through the connecting plates, causing the rocker arm 11 to rotate and trigger the pressure sensor 3. This allows for timely feedback of the warp tension change, enabling immediate adjustment of the warp tension as soon as it changes, effectively ensuring the accuracy of the warp tension adjustment device of this invention and further guaranteeing product quality.

[0048] In this embodiment, the structure of the loosening roller 2 can be designed in various ways, as long as it can rotate with the warp yarn to meet the needs of conveying the warp yarn.

[0049] Furthermore, the warp release roller 2 includes a roller and a roller shaft. The roller is rotatably mounted on the roller shaft to transport warp yarns. The two ends of the roller shaft are respectively fixed to the rocker arms 11 of the left swing mechanism and the right swing mechanism 1. The axis of the roller shaft is located directly above the axis of the fixed shaft 10. Specifically, the roller and the roller shaft are connected by bearings.

[0050] Furthermore, the loosening roller 2 can also be designed such that the roller and the roller shaft are fixedly connected to each other, and the two ends of the loosening roller 2 (i.e. the two ends of the roller shaft) are set on the rocker arms 11 of the left swing mechanism and the right swing mechanism 1 through bearings, and the axis of the bearing seat of the bearing is located directly above the axis of the fixed shaft 10.

[0051] Example 2

[0052] Examples of embodiments of the present invention Figure 2-3 As shown, the warp tension adjusting device with the limiting mechanism 12 of the second embodiment described above mainly adds the following features:

[0053] 1) Add upper adjusting screw sleeve 51 and lower adjusting screw sleeve 52

[0054] 2) Add a distance measuring device.

[0055] 3) A tension monitoring device has been added to calculate the tension F2 of the loosening roller 2 based on distances d1 and d2 and real-time pressure F1. The calculated tension F2 is used to adjust the spindle speed to achieve rapid and precise adjustment of the warp tension.

[0056] The upper adjusting sleeve 51 and the lower adjusting sleeve 52 are used. The limiting shaft is fixed on the upper limiting member 121. The upper adjusting sleeve 51 is threadedly connected to the limiting shaft. The lower adjusting sleeve 52 includes a threaded outer ring 521 and a threaded inner ring 522. The threaded outer ring 521 and the threaded inner ring 522 are threadedly connected. Both the threaded outer ring 521 and the threaded inner ring 522 are wrapped around the limiting shaft. The upper adjusting sleeve 51 is located between the upper limiting spring 123 and the upper limiting member 121, and the lower adjusting sleeve 52 is located between the lower limiting spring 124 and the lower limiting member 122. Initially, by adjusting the upper adjusting sleeve 51 and the lower adjusting sleeve 52, the rocker arm 11 is adjusted to the horizontal direction. Furthermore, the lower adjusting screw sleeve 52 cannot contact the limiting shaft, so that the lower limiting spring 124 can sit on the pressure sensing device 3 through the lower adjusting screw sleeve 52, avoiding affecting the pressure sensing device 3's sensing of pressure changes after the rocker arm 11 rotates. Therefore, the lower adjusting screw sleeve 52 is designed to adjust the height by adjusting the relative position of the outer threaded ring 521 and the inner threaded ring 522.

[0057] A distance measuring device is installed on the warp feed wall plate 4. The distance measuring device includes a mounting base, a first distance sensor 61, and a second distance sensor 62. The mounting base is located horizontally on the warp feed wall plate 4. The first distance sensor 61 and the second distance sensor 62 are installed on the mounting base with a horizontal distance between them. The first distance sensor 61 is used to detect the distance d1 between the rocker arm 11 and the mounting base. The second distance sensor 62 is used to detect the distance d2 between the rocker arm 11 and the mounting base. The output ends of the first distance sensor 61, the second distance sensor 62, and the pressure sensing device 3 are all connected to a tension monitoring device. The pressure sensing device 3 is located between the lower adjusting screw sleeve 52 and the lower limit member 122. The pressure sensing device 3 is used to detect the real-time pressure F1 of the rocker arm 11, the lower limit spring 124, and the lower adjusting screw sleeve 52. The tension monitoring device is used to calculate the tension F2 of the loosening roller 2 based on the distance d1, the distance d2, and the real-time pressure F1.

[0058] The tension F2 of the loosening roller 2 is calculated based on the corrected pressure F5, including the following steps:

[0059] S1. Obtain test data, including the following steps: S311. Test preparation: An annular pressure sensor is installed on the warp loosening roller 2. The outer diameter of the annular pressure sensor is equal to the outer diameter of the middle part of the warp loosening roller 2. S312. The warp tension adjustment device is working normally. The warp yarns pass around the outer walls of the warp loosening roller 2 and the annular pressure sensor. During the process, the annular pressure sensor outputs test pressure F6, and the pressure sensing device 3 obtains the real-time pressure F1. At the same time, the first distance sensor 61 and the second distance sensor 62 obtain the distances d1 and d2, respectively. S313. Replace the annular pressure sensor with a warp loosening ring 7. The outer diameter of the warp loosening ring 7 is equal to the outer diameter of the annular pressure sensor, and the weight of the warp loosening ring 7 is equal to that of the annular pressure sensor. S314. End the experiment.

[0060] S2. Calculate the distance-based predicted pressure F0 based on distances d1 and d2;

[0061] S3. Obtain the corrected pressure F5 based on the distance-based predicted pressure F0 and the real-time pressure F1;

[0062] S4. Calculate the tension F2 of the loosening roller 2, F2 = a + bF5 + cF5 2 +dF5 3 (Formula 1) In Formula 1, a, b, c, and d are constants. We use F6 to substitute into F2 in Formula 1 and use a regression model to obtain a, b, c, and d.

[0063] Assume that the rocker arm 11 has a through hole for the limiting shaft to pass through, the diameter of the through hole is larger than the diameter of the limiting shaft, and the distance between the center line of the through hole on the rocker arm 11 and the center of the fixed shaft 10 is L0. The calculation of the distance-based predicted pressure F0 based on the distances d1 and d2 in step S2 includes the following steps:

[0064] S21. Calculate the angle α between the rocker arm 11 and the horizontal direction. d0 is the distance between the first distance sensor 61 and the second distance sensor 62;

[0065] S22. Calculate the distance h0 that the perforation position in rocker arm 11 is lowered or raised.

[0066] S23. Calculate the elastic force F3 exerted by the upper limit spring 123 on the rocker arm 11. F3 = k1 * [L1 - (h1 - h0)], where k1 is the elastic coefficient of the upper limit spring 123, L1 is the natural elongation length of the upper limit spring 123, and h1 is the height of the upper limit spring 123 when the rocker arm 11 is in the horizontal direction.

[0067] S24. Calculate the elastic force F4 of the lower limit spring 124 on the rocker arm 11. F4 = k2 * [L2 - (h2 - h0)], where k2 is the elastic coefficient of the lower limit spring 124, L2 is the natural elongation length of the lower limit spring 124, and h2 is the height of the lower limit spring 124 when the rocker arm 11 is in the horizontal direction.

[0068] S25, Distance-based predicted pressure F0 = F4 + M1 + M2, where M1 is the weight of the lower adjusting screw sleeve 52 and M2 is the weight of the lower limit spring 124.

[0069] Step S3 includes the following steps:

[0070] S31. Calculate the distance-based predicted pressure F0 corresponding to distances d1 and d2 in the test data;

[0071] S32. All distance-based predicted pressures F0 obtained from the test data constitute the distance pressure sequence U1.

[0072] S33. All real-time pressures F1 in the test data form a real-time pressure sequence U2, all distances d1 in the test data form a distance sequence D1, and all distances d2 in the test data form a distance sequence D2.

[0073] S34. Calculate the difference sequence ΔU, ΔU=(U2-U1) / 2;

[0074] S35. Establish a relational model between the difference sequence ΔU, the distance sequence D1, and the distance sequence D2:

[0075] △U=e0+e1 D1+e2D2, the constants e0, e1 and e2 are obtained by the least squares method;

[0076] S36. Calculate F5 = F1 + △U.

[0077] First, the real-time pressure F1 is obtained through the pressure sensing device 3. Then, the difference sequence ΔU required for correction is obtained through distance sequence D1 and distance sequence D2. Next, the correction pressure F5 is obtained by correcting with the difference sequence ΔU. Since there is definitely a difference between the theoretical value F0 and the real-time pressure F1, the theoretical value F0 is affected by slight movement differences ignored during calculation (that is, the center line of the perforation axis on the rocker arm 11 is offset from the center line of the limit axis after rotation, which causes a difference). The real-time pressure F1 also has errors due to the detection of the pressure sensing device 3. Therefore, half of the difference ΔU is used to correct the real-time pressure F1 to obtain the correction pressure. F5 makes the correction pressure F5 more accurate, reducing the error of the correction pressure F5 value to the final tension F2; finally, F2 is calculated using Formula 1. Since the ring pressure sensor cannot be in contact with the warp for a long time during normal operation, it is easy to cause damage. Therefore, F2 is indirectly obtained by setting pressure sensing device 3, first distance sensor 61 and second distance sensor 62. Therefore, in normal use, the loose warp ring 7 is used to replace the pressure sensing device 3 during the experimental test to ensure that the pressure sensing device 3 and the loose warp ring 7 have the same weight, and the outer diameter of the pressure sensing device 3 is equal to the outer diameter of the loose warp ring 7.

[0078] Example 3

[0079] Embodiments of the present invention also disclose a weaving machine, including the warp tension adjusting device described in any of the above embodiments and warp feed wall plates 4 disposed on the left and right sides of the weaving machine. The two ends of the warp tension adjusting device are respectively disposed on the left and right warp feed wall plates 4. By employing the aforementioned warp tension adjusting device, the weaving machine of the present invention can detect changes in warp tension in a timely and accurate manner, and restore the warp tension to a normal state promptly through a control device, effectively improving production efficiency and ensuring product quality.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A warp tension adjusting device, characterized in that: It includes a left swing mechanism, a right swing mechanism (1), a loosening roller (2), and a pressure sensing device (3); The left swing mechanism and the right swing mechanism (1) are respectively installed on the warp feed wall plates (4) on the left and right sides of the loom and can rotate back and forth along the warp feed direction; The two ends of the loosening roller (2) are respectively set on the left swing mechanism and the right swing mechanism (1) for conveying and lifting the warp yarn, and when the warp yarn tension on the loosening roller (2) changes, it can drive the left swing mechanism and the right swing mechanism (1) to rotate forward or backward. The pressure sensing device (3) is connected to the control device of the loom. The pressure sensing device (3) is configured to sense the forward or backward swing of the left swing mechanism and the right swing mechanism (1) and transmit the signal to the control device. After receiving the signal from the pressure sensing device (3), the control device controls the rotation speed of the loom's warp beam to restore the warp tension to normal. The left swing mechanism and the right swing mechanism (1) have basically the same structure and each includes: a fixed shaft (10), a rocker arm (11) and a limiting mechanism (12). The limiting mechanism (12) includes an upper limiting component (121), a lower limiting component (122), and a limiting shaft; The limiting mechanism (12) further includes an upper limiting spring (123) and a lower limiting spring (124); the lower limiting spring (124) is provided with the pressure sensing device (3) at its end. A distance measuring device is installed on the wire feeding wall panel (4). The distance measuring device includes: a mounting base, a first distance sensor and a second distance sensor. The first distance sensor is used to detect the distance d1 between the rocker arm (11) and the mounting base, and the second distance sensor is used to detect the distance d2 between the rocker arm (11) and the mounting base. The tension F2 of the loosening roller (2) is calculated based on the corrected pressure F5, including the following steps: S1. Obtain test data, including the following steps: S311. Test preparation: An annular pressure sensor is installed on the loosening roller (2), and the outer diameter of the annular pressure sensor is equal to the outer diameter of the middle part of the loosening roller (2); S312. The warp tension adjustment device works normally, and the warp yarns pass around the outer walls of the loosening roller (2) and the annular pressure sensor. During the process, the annular pressure sensor outputs test pressure F6, and the pressure sensing device (3) obtains real-time pressure F1. At the same time, the first distance sensor and the second distance sensor obtain distance d1 and distance d2 respectively; S313. Replace the annular pressure sensor with a loosening ring, the outer diameter of the loosening ring is equal to the outer diameter of the annular pressure sensor, and the weight of the loosening ring is equal to that of the annular pressure sensor; S314. End the experiment; S2. Calculate the distance-based predicted pressure F0 based on distances d1 and d2; S3. Obtain the corrected pressure F5 based on the distance-based predicted pressure F0 and the real-time pressure F1; S4. Calculate the tension F2 of the loosening roller (2). (Formula 1), in Formula 1 As a constant, substitute F6 into F2 in Formula 1 and use a regression model to obtain... .

2. The warp tension adjusting device according to claim 1, characterized in that: The fixed shaft (10) is fixed to the warp feeding wall plate (4) on the same side, and the fixed shaft (10) is parallel to the axis of the warp loosening roller (2); The rocker arm (11) is rotatably mounted on the fixed shaft (10). The axis of the loosening roller (2) is set on the rocker arm (11) and is located directly above the axis of the fixed shaft (10); The limiting mechanism (12) is fixed to the same side of the feed wall plate (4) to limit the swing amplitude of the rocker arm (11).

3. The warp tension adjusting device according to claim 2, characterized in that: The limiting shaft is fixed between the upper limiting member (121) and the lower limiting member (122); The rocker arm (11) has a limiting hole at its first end away from the fixed shaft (10) for the limiting shaft to pass through.

4. The warp tension adjusting device according to claim 3, characterized in that: The upper limit spring (123) is located between the rocker arm (11) and the upper limit member (121), and the lower limit spring (124) is located between the rocker arm (11) and the lower limit member (122).

5. The warp tension adjusting device according to claim 4, characterized in that: An upper adjusting screw sleeve and a lower adjusting screw sleeve pass through the limiting shaft. The limiting shaft is fixed on the upper limiting member (121). The upper adjusting screw sleeve is threadedly connected to the limiting shaft. The lower adjusting screw sleeve includes a threaded outer ring and a threaded inner ring. The threaded outer ring and the threaded inner ring are threadedly connected. Both the threaded outer ring and the threaded inner ring are wrapped around the limiting shaft. The upper adjusting screw sleeve is located between the upper limiting spring (123) and the upper limiting member (121). The lower adjusting screw sleeve is located between the lower limiting spring (124) and the lower limiting member (122).

6. The warp tension adjusting device according to claim 5, characterized in that: A mounting base located in the horizontal direction is installed on the warp feed wall plate (4). A first distance sensor and a second distance sensor with a gap in the horizontal direction are installed on the mounting base. The output end of the first distance sensor, the output end of the second distance sensor, and the output end of the pressure sensing device (3) are all connected to a tension monitoring device. The pressure sensing device (3) is located between the lower adjusting screw sleeve and the lower limit member (122). The pressure sensing device (3) is used to detect the real-time pressure F1 of the rocker arm (11), the lower limit spring (124), and the lower adjusting screw sleeve. The tension monitoring device is used to calculate the tension F2 of the loosening roller (2) based on the distance d1, the distance d2, and the real-time pressure F1.

7. The warp tension adjusting device according to claim 6, characterized in that: Assume that the rocker arm (11) has a through hole for the limiting shaft to pass through, the diameter of the through hole is larger than the diameter of the limiting shaft, and the distance between the center line of the through hole on the rocker arm (11) and the center line of the fixed shaft (10) is L0. The calculation of the distance-based predicted pressure F0 in step S2 based on the distance d1 and the distance d2 includes the following steps: S21. Calculate the angle α between the rocker arm (11) and the horizontal direction. d0 is the distance between the first distance sensor and the second distance sensor; S22. Calculate the distance h0 that the perforation position in the rocker arm (11) is lowered or raised. ; S23. Calculate the elastic force F3 exerted by the upper limit spring (123) on the rocker arm (11). k1 is the elastic coefficient of the upper limit spring (123), L1 is the natural elongation length of the upper limit spring (123), and h1 is the height of the upper limit spring (123) when the rocker arm (11) is in the horizontal direction. S24. Calculate the elastic force F4 exerted by the lower limit spring (124) on the rocker arm (11). k2 is the elastic coefficient of the lower limit spring (124), L2 is the natural elongation length of the lower limit spring (124), and h2 is the height of the lower limit spring (124) when the rocker arm (11) is in the horizontal direction. S25, Distance-based predicted pressure F0 = F4 + M1 + M2, where M1 is the weight of the lower adjusting screw sleeve and M2 is the weight of the lower limit spring (124).

8. A loom, characterized in that: The device includes the warp tension adjusting device as described in any one of claims 1-6 and the warp feed wall plates (4) disposed on the left and right sides of the loom, wherein the two ends of the warp tension adjusting device are respectively disposed on the warp feed wall plates (4) on the left and right sides.

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