Warp tension adjusting device and loom

Abstract

The invention 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 arranged on warp feeding wallboards on the left side and the right side of the loom respectively and can rotate front and back in the warp conveying direction. The two ends of the warp loosening roller are arranged on the left swing mechanism and the right swing mechanism respectively and used for conveying and lifting warp. According to the warp tension adjusting device, the warp loosening rollers are arranged on the left swing mechanism and the right swing mechanism, the change of the warp tension can be detected in time, and the warp tension can be effectively adjusted in time.

Description

Technical Field

[0001] The invention relates to the technical field of textile equipment, and in particular to a warp tension regulating device and a loom. Background Art

[0002] The warp tension adjustment device in the prior art includes a guide roller, a back beam roller and a connecting arm, and the roller shaft of the back beam roller is fixedly connected to the rotating shaft of the guide roller through the connecting arm. In the working state, the back beam roller is used to transport and lift the warp yarn. When the warp yarn tension changes, the warp yarn will exert an additional force on the back beam roller, and this force will generate a torque on the rotating shaft of the guide roller, thereby driving the rotating shaft of the guide roller to rotate. When the rotating shaft of the guide roller rotates, it will send a signal to the control device of the weaving shaft transmission device. After receiving the signal, the control device will control the speed of the transmission output shaft, so that the speed of the weaving shaft will also change accordingly, and the warp yarn tension can quickly return to normal. However, in the warp tension adjustment device of the prior art, it is possible that although the warp tension changes, the shaft of the guide roller does not rotate. This is because the direction of the force acting on the rear beam roller when the warp tension changes is uncertain. Once the direction of the force acting on the warp tension is close to being parallel to the connecting arm, the torque generated on the shaft of the guide roller will be very small, thereby failing to drive the shaft of the guide roller to rotate or only driving the shaft of the guide roller to rotate a very small angle, resulting in the control device being unable to make accurate adjustments to the rotation speed of the weaving shaft, ultimately resulting in the warp tension being unable to return to normal in time, thus affecting the quality of the product. Summary of the invention

[0003] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a warp tension regulating device which can timely detect the change of warp tension and make timely and effective adjustments to the warp tension, thereby ensuring product quality.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a warp tension adjustment device, comprising a left swing mechanism, a right swing mechanism, a warp easing roller and a pressure sensing device; the left swing mechanism and the right swing mechanism are respectively arranged on the warp feeding wall panels on the left and right sides of the loom and can rotate forward and backward along the conveying direction of the warp yarn; the two ends of the warp easing roller are respectively arranged on the left swing mechanism and the right swing mechanism for conveying and lifting the warp yarn, and when the warp yarn tension on the warp easing roller changes, the left swing mechanism and the right swing mechanism can be driven to rotate forward or backward; 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 swinging of the left swing mechanism and the right swing mechanism and transmit the signal to the control device, and after receiving the signal from the pressure sensing device, the control device will control the rotation speed of the weaving shaft of the loom to restore the warp yarn tension to normal.

[0005] In an optional embodiment of the present invention, the left swing mechanism and the right swing mechanism have basically the same structure and each comprises: a fixed shaft, a rocker arm and a limiting mechanism; the fixed shaft is fixed to the warp feeding wall panel on the same side, and the fixed shaft is parallel to the axis of the warp easing roller; the rocker arm is rotatably arranged on the fixed shaft; the axis of the warp easing roller is arranged on the rocker arm and is located directly above the axis of the fixed shaft; the limiting mechanism is fixed to the warp feeding wall panel 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 also includes a loosening spring, which is vertically arranged 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 pressure sensing device is provided at one end of the loosening spring away from the rocker arm to transmit the expansion and contraction force applied to the loosening spring to the control device.

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

[0009] In an optional embodiment of the present invention, an upper adjusting screw sleeve and a lower adjusting screw sleeve pass through the limit shaft, the limit shaft is fixed on the upper limit member, the upper adjusting screw sleeve is threadedly connected to the limit shaft, and the lower adjusting screw sleeve includes: a threaded outer ring and a threaded inner ring, the threaded outer ring is threadedly connected to the threaded inner ring, the threaded outer ring and the threaded inner ring are both surrounded by the outside of the limit shaft, the upper adjusting screw sleeve is located between the upper limit spring and the upper limit member, and the lower adjusting screw sleeve is located between the lower limit spring and the lower limit member.

[0010] In an optional embodiment of the present invention, a distance measuring device is installed on the warp let-off wall panel, and the distance measuring device includes: a mounting seat, a first distance sensor and a second distance sensor. A mounting seat located in the horizontal direction is installed on the warp let-off wall panel, and a first distance sensor and a second distance sensor are installed on the mounting seat at a distance in the horizontal direction. The first distance sensor is used to detect the distance d1 between the rocker arm and the mounting seat, and the second distance sensor is used to detect the distance d2 between the rocker arm and the mounting seat. 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 are all connected to a tension monitoring device. The pressure sensing device is located between the lower adjusting screw 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 screw sleeve. The tension monitoring device is used to calculate the tension F2 of the warp loosening roller according to 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 easing roller according to the corrected pressure F5 includes the following steps:

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

[0013] S2, calculating the distance-based predicted pressure F0 according to the distance d1 and the distance d2;

[0014] S3, obtaining a corrected pressure F5 according to the distance-based predicted pressure F0 and the real-time pressure F1;

[0015] S4. Calculate the tension F2 of the easing roller (2), F2 = a + bF5 + cF5 2 +dF5 3 (Formula 1), where a, b, c, and d are constants, F6 is substituted into F2 in Formula 1 and a, b, c, and d are obtained using the regression model.

[0016] In an optional embodiment of the present invention, it is assumed that 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 axis centerline of the through hole on the rocker arm and the axis center of the fixed shaft is L0. In step S2, the distance-based predicted pressure F0 is calculated according to the distance d1 and the distance d2, including the following steps:

[0017] S21, calculate the angle a 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 of the lowering or raising of the perforation position in the rocker arm,

[0019] S23. Calculate the elastic force F3 of the upper limit spring on the rocker arm, F3=k1*[L1-(h1-h0)], 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 elastic force F4 of the lower limit spring on the rocker arm, F4=k2*[L2-(h2-h0)], k2 is the elastic coefficient of the lower limit spring, L2 is the natural extension length 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 type 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 loom, comprising the warp tension adjustment device described in any one of the above and warp feeding wall panels arranged on the left and right sides of the loom, wherein the two ends of the warp tension adjustment device are respectively arranged on the warp feeding wall panels on the left and right sides.

[0023] The warp tension regulating device of the present invention directly sets the easing roller on the left and right swinging mechanisms. When the tension of the warp passing through the easing roller changes, the left and right swinging mechanisms will immediately swing forward or backward, thereby triggering the pressure sensor device to transmit the swinging information to the control device, so that the control device can timely adjust the rotation speed of the weaving shaft to quickly restore the warp tension to normal; at the same time, since the warp is transported from top to bottom through the easing roller, as long as the warp tension changes, it will cause the easing roller to drive the left and right swinging mechanisms to swing forward or backward, and the phenomenon that the change of the warp tension cannot be timely transmitted to the control device in the prior art will not occur. The warp tension regulating device of the present invention can not only detect the change of the warp tension in time and make timely and effective adjustments to the warp tension, thereby ensuring product quality, but also has a simpler structure, omitting the guide roller in the prior art, and effectively reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0026] Figure 2 It is a structural schematic diagram of a warp tension adjustment device provided in Example 2 of the present invention.

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

[0028] Description of Reference Numerals

[0029] 1 right swing mechanism, 10 fixed shaft, 11 rocker arm, 12 limit mechanism, 121 upper limit member, 122 lower limit member, 123 upper limit spring, 124 lower limit spring, 2 warp easing roller, 3 pressure sensor, 4 warp feeding wallboard, 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 warp easing ring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0032] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0035] Example 1

[0036] like Figure 1 As shown, an embodiment of the present invention provides a warp tension adjustment device, including a left swing mechanism, a right swing mechanism 1, a warp easing roller 2 and a pressure sensing device 3. The left swing mechanism and the right swing mechanism 1 are respectively arranged on the warp feeding wall panels 4 on the left and right sides of the loom and can rotate forward and backward along the conveying direction of the warp yarn; the two ends of the warp easing roller 2 are respectively arranged 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 warp easing roller 2 changes, the left swing mechanism and the right swing mechanism 1 can be driven to rotate forward or backward; the pressure sensing device 3 is connected to the control device of the transmission device of the loom, and the pressure sensing device 3 is configured to sense the forward or backward swinging 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 will control the rotation speed of the weaving shaft of the loom to restore the warp yarn tension to normal.

[0037] In this embodiment, the left swing mechanism and the right swing mechanism 1 can be rotated forward and backward along the conveying direction of the warp yarn and are respectively arranged on the left and right sides of the warp let-off wall panels 4. The prior art looms all include the warp let-off wall panels located on the left and right sides, and the warp let-off wall panels 4 here are the warp let-off wall panels in the prior art, which will not be described in detail here.

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

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

[0040] In this embodiment, the control device is used to control the transmission mechanism of the loom including the weaving shaft, and is used to start, shut down and adjust the rotation speed, etc.

[0041] During the production process, when the warp easing roller 2 is conveying the warp yarn output from the weaving shaft of the loom, if the warp yarn tension changes, the warp easing roller 2 as a whole will be subjected to a forward or backward pulling force. Since the two ends of the warp easing roller 2 are respectively arranged on the left swing mechanism and the right swing mechanism 1, when the two ends of the warp feeding roller 2 produce a forward or backward rotation movement trend under the action of the warp yarn tension, the left swing mechanism and the right swing mechanism 1 will be driven to rotate forward or backward. When the left swing mechanism and the right swing mechanism 1 rotate forward or backward, the pressure sensor device 3 will be triggered. The pressure sensor device 3 transmits the received data to the control device. The control device will analyze the data and adjust the rotation speed of the weaving shaft accordingly so that the warp yarn tension can quickly return to normal. The warp tension adjustment device of the present invention eliminates the guide roller in the prior art, will no longer hinder the disassembly and assembly of the warp beam, and eliminates the process of carrying the guide roller and the rear beam roller connected to the guide roller back and forth when replacing the warp beam in the prior art; the warp tension adjustment device of the present invention directly sets the loosening roller on the left and right swinging mechanisms. When the tension of the warp yarn passing through the loosening roller changes, it will immediately cause the left and right swinging mechanisms to swing forward or backward, thereby triggering the pressure sensor device to transmit the swing information to the control device, so that the control device can adjust the rotation speed of the weaving beam in time to quickly restore the warp tension to normal; at the same time, since the warp yarn is transported from top to bottom through the loosening roller, as long as its warp tension changes, it will cause the loosening roller to drive the left and right swinging mechanisms to swing forward or backward, and the phenomenon that the change of the warp tension cannot be transmitted to the control device in time in the prior art will not occur. The warp tension adjustment device of the present invention can detect the change of warp tension in time and make timely and effective adjustments to the warp tension by directly arranging the easing rollers on the left and right swing mechanisms, thereby ensuring product quality. At the same time, its structure is simpler, eliminating the guide rollers in the prior art, improving the work efficiency of replacing the warp beam, and also reducing production costs.

[0042] Optionally, in order 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 have basically the same structure and each includes: a fixed shaft 10, a rocker arm 11, and a limiting mechanism 12; the fixed shaft 10 is fixed to the warp letting wall plate 4 on the same side, and the fixed shaft 10 and the axis of the warp easing roller 2 are parallel to each other; the rocker arm 11 is rotatably arranged on the fixed shaft 10; the axis of the warp easing roller 2 is arranged 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 warp letting wall plate 4 on the same side to limit the swing amplitude of the rocker arm 11. When the warp tension on the warp easing roller 2 changes, since the warp easing roller 2 is located on the rocker arm 11 and above the fixed shaft 10, the warp easing roller 2 will have a tendency to rotate forward or backward along the warp conveying direction under the action of the change in warp tension, thereby driving the rocker arm 11 arranged on the fixed shaft 10 to rotate forward or backward. At this time, the limiting mechanism 12 fixed on the warp letting 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 only needs to be limited within the range that can be sensed by the pressure sensor device 3. Do not rotate it too much to avoid causing the rocker arm to be reset in time.

[0043] Furthermore, in order to limit the rotation range 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 up and down rotation range of the rocker arm 11, and at the same time, the limiting shaft can also limit the rocker arm 11 circumferentially to prevent the rocker arm 11 from circumferentially moving due to machine vibration or other external forces, effectively ensuring that the rocker arm can stably rotate up and down when the warp tension changes. Specifically, the limiting hole opened on the rocker arm 11 for the limiting shaft to pass through can be designed as a waist-shaped hole extending along the warp transmission direction, thereby effectively avoiding the phenomenon of the rocker arm 11 being stuck by the limiting shaft.

[0044] In addition, in order to cushion 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 limit mechanism 12 can be designed as a variety of structures. The following two implementation methods are listed here as preferred methods, which can be selected according to actual needs during specific implementation.

[0045] The first embodiment of the limiting mechanism 12 is: the limiting mechanism 12 also includes a warp loosening spring (not shown in the figure), which is vertically arranged on the limiting shaft and is located between the rocker arm 11 and the lower limiting member 122 or between the rocker arm 11 and the upper limiting member 121. The end of the warp loosening spring away from the rocker arm 11 is provided with a pressure sensing device 3 to transmit the expansion and contraction force of the warp loosening spring to the control device. Specifically, the warp loosening spring is placed vertically and the limiting shaft passes through it. One end of the warp loosening spring is connected to the lower limiting member 122 or the upper limiting member 121, and the other end of the warp feeding spring is connected to the rocker arm 11. In this way, when the rocker arm 11 swings due to the change of the warp tension, the warp loosening spring will be pulled or compressed. The pressure sensing device 3 installed at the end of the warp loosening spring away from the rocker arm will promptly sense the tension or compression force on the spring and transmit it to the control device to timely adjust the warp beam speed so that the warp tension quickly returns to normal.

[0046] The second embodiment of the limit mechanism 12 is as follows: the limit mechanism 12 further includes an upper limit spring 123 and a lower limit spring 124, 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; a pressure sensor 3 is provided at the end of the lower limit spring 124. In order to reduce the influence of gravity, the upper limit spring 123 and the lower limit spring 124 are set to be always in a compressed state during operation. In this embodiment, when the rocker arm 11 swings back and forth, the pressure sensor at the end of the lower limit spring 124 will promptly sense the pressure change from the rocker arm 11, and transmit the information to the control device to timely adjust the warp tension.

[0047] Furthermore, in order to enable the rocker arm to swing in time and accurately detect the tension change when the warp tension just starts to change, the two ends of the warp easing roller 2 are respectively arranged on the rocker arm 11 on the same side through a connecting plate, and the connecting plate is a long strip plate extending along the warp transmission direction, and the connecting plate is symmetrically arranged about the fixed axis 10. In this way, when the warp tension starts to change slightly, the warp letting roller 2 can increase the torque through the connecting plate to rotate the rocker arm 11 to trigger the pressure sensor 3, so that the information of the warp tension change can be fed back in time, so that the warp tension can be adjusted in time when it just changes, effectively ensuring the accuracy of the warp tension adjustment device of the present invention, and further ensuring the product quality.

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

[0049] Furthermore, the easing roller 2 includes a roller and a roller shaft, the roller is rotatably arranged on the roller shaft to convey the warp yarn, the two ends of the roller shaft are respectively fixed on the rocker arms 11 of the left swing mechanism and the right swing mechanism 1, and 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 matched through bearings.

[0050] Furthermore, the warp easing roller 2 can also be designed so that the roller and the roller shaft are fixedly connected to each other, and the two ends of the warp easing roller 2 (i.e., the two ends of the roller shaft) are arranged 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] Embodiments of the present invention Figure 2-3 As shown, the following features are mainly added to the warp tension adjustment device having the limiting mechanism 12 of the second embodiment described above:

[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 is added to calculate the tension F2 of the easing roller 2 according to the distance d1, the distance d2 and the real-time pressure F1. The rotation speed of the rotating shaft is adjusted by the calculated tension F2 to achieve the effect of quickly and accurately adjusting the warp tension.

[0056] The upper adjusting screw sleeve 51 and the lower adjusting screw sleeve 52, the limit shaft is fixed on the upper limit member 121, the upper adjusting screw sleeve 51 is threadedly connected with the limit shaft, the lower adjusting screw sleeve 52 comprises: 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, the threaded outer ring 521 and the threaded inner ring 522 are both surrounded outside the limit shaft, the upper adjusting screw sleeve 51 is located between the upper limit spring 123 and the upper limit member 121, and the lower adjusting screw sleeve 52 is located between the lower limit spring 124 and the lower limit member 122. Initially, by adjusting the upper adjusting screw sleeve 51 and the lower adjusting screw sleeve 52, the rocker arm 11 is adjusted to the horizontal direction. And the lower adjusting screw sleeve 52 cannot contact with the limit shaft, so that the lower limit spring 124 can sit on the pressure sensing device 3 through the lower adjusting screw sleeve 52, avoiding affecting the pressure change of the pressure sensing device 3 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 threaded outer ring 521 and the threaded inner ring 522.

[0057] A distance measuring device is installed on the warp letting wall panel 4, and the distance measuring device includes: a mounting seat, a first distance sensor 61 and a second distance sensor 62. A mounting seat located in the horizontal direction is installed on the warp letting wall panel 4, and a first distance sensor 61 and a second distance sensor 62 are installed on the mounting seat with a spacing in the horizontal direction. The first distance sensor 61 is used to detect the distance d1 between the rocker arm 11 and the mounting seat, and the second distance sensor 62 is used to detect the distance d2 between the rocker arm 11 and the mounting seat. The output end of the first distance sensor 61, the output end of the second distance sensor 62 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 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 warp easing roller 2 according to the distance d1, the distance d2 and the real-time pressure F1.

[0058] Calculating the tension F2 of the easing roller 2 according to the corrected pressure F5 includes the following steps:

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

[0060] S2, calculating the distance-based predicted pressure F0 according to the distance d1 and the distance d2;

[0061] S3, obtaining a corrected pressure F5 according to the distance-based predicted pressure F0 and the real-time pressure F1;

[0062] S4. Calculate the tension F2 of the easing roller 2, F2 = a + bF5 + cF5 2 +dF5 3 (Formula 1), where a, b, c, and d are constants, F6 is substituted into F2 in Formula 1 and a, b, c, and d are obtained using the regression model.

[0063] Assume that the rocker arm 11 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 axis centerline of the through hole on the rocker arm 11 and the axis center of the fixed shaft 10 is L0. In step S2, the distance-based predicted pressure F0 is calculated according to the distance d1 and the distance d2, including the following steps:

[0064] S21, calculate the angle a 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, calculating the distance h0 of the perforation position in the rocker arm 11 being lowered or raised,

[0066] S23, calculate the elastic force F3 of the upper limit spring 123 on the rocker arm 11, F3 = k1*[L1-(h1-h0)], k1 is the elastic coefficient of the upper limit spring 123, L1 is the natural extension 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)], k2 is the elastic coefficient of the lower limit spring 124, L2 is the natural extension 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, calculating the distance-based predicted pressure F0 corresponding to the distance d1 and the distance d2 in the test data;

[0071] S32, all the distance-predicted pressures F0 obtained through the test data form a 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 △U, △U=(U2-U1) / 2;

[0074] S35, establish the relationship model between the difference sequence △U, the distance sequence D1 and the distance sequence D2:

[0075] △U=e0+e1 D1+e2D2, constants e0, e1 and e2 are obtained by the least square 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 △U required for correction is obtained through the distance sequence D1 and the distance sequence D2; then, the difference sequence △U is used to correct and obtain the corrected pressure F5. Since there must be a difference between the theoretical value F0 and the real-time pressure F1, the theoretical value F0 is subject to a slight movement difference that is ignored during calculation (that is, the axis of the perforation on the rocker arm 11 is offset from the axis of the limit shaft after rotation, which results in a difference), and the real-time pressure F1 also has an error due to the detection of the pressure sensing device 3, half of the difference △U is used to correct the real-time pressure F1 to obtain the corrected pressure F5, making 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 annular pressure sensor cannot be in contact with the warp for a long time during normal processes and is easily damaged, a pressure sensing device 3, a first distance sensor 61 and a second distance sensor 62 are set to indirectly obtain F2. Therefore, in normal use, a loose warp ring 7 is used to replace the pressure sensing device 3 during experimental testing 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] The embodiment of the present invention further discloses a loom, comprising the warp tension adjusting device described in any one of the above embodiments and warp letting wall panels 4 arranged on the left and right sides of the loom, and the two ends of the warp tension adjusting device are respectively arranged on the warp letting wall panels 4 on the left and right sides. The loom of the present invention can detect the change of warp tension timely and accurately by adopting the above warp tension adjusting device, and restore the warp tension to a normal state in time through the control device, thereby effectively improving the production efficiency and ensuring the product quality.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 adjustment device, characterized in that: It comprises a left swing mechanism, a right swing mechanism (1), a warp easing roller (2) and a pressure sensing device (3); The left swing mechanism and the right swing mechanism (1) are respectively arranged on the warp let-off wall panels (4) on the left and right sides of the loom and can rotate forward and backward along the conveying direction of the warp yarns; The two ends of the easing roller (2) are respectively arranged 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 easing roller (2) changes, the left swing mechanism and the right swing mechanism (1) can be driven 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 swinging 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 weaving shaft of the loom so that the warp tension returns to normal.

2. The warp tension adjustment device according to claim 1, characterized in that: The left swing mechanism and the right swing mechanism (1) have substantially the same structure and each comprises: a fixed shaft (10), a rocker arm (11) and a limiting mechanism (12); The fixed shaft (10) is fixed to the warp delivery wall plate (4) on the same side, and the fixed shaft (10) and the axis of the warp easing roller (2) are parallel to each other; The rocker arm (11) is rotatably arranged on the fixed shaft (10); The axis of the easing roller (2) is arranged 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 warp-feeding wall plate (4) on the same side and is used 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 mechanism (12) comprises an upper limiting member (121), a lower limiting member (122) and a limiting shaft; 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.

4. The warp tension adjusting device according to claim 3, characterized in that: The limiting mechanism (12) also includes a warp loosening spring, which is vertically arranged on the limiting shaft and is located between the rocker arm (11) and the lower limiting member (122) or between the rocker arm (11) and the upper limiting member (121). The end of the warp loosening spring away from the rocker arm (11) is provided with the pressure sensing device (3) to transmit the expansion and contraction force exerted on the warp loosening spring to the control device.

5. The warp tension adjusting device according to claim 3, characterized in that: The limit mechanism (12) further comprises an upper limit spring (123) and a lower limit spring (124); 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); the pressure sensing device (3) is provided at the end of each of the lower limit springs (124).

6. The warp tension adjusting device according to claim 5, characterized in that: An upper adjusting screw sleeve and a lower adjusting screw sleeve pass through the limit shaft. The limit shaft is fixed on the upper limit member (121). The upper adjusting screw sleeve is threadedly connected to the limit shaft. The lower adjusting screw sleeve comprises: a threaded outer ring and a threaded inner ring. The threaded outer ring is threadedly connected to the threaded inner ring. Both the threaded outer ring and the threaded inner ring surround the outside of the limit shaft. The upper adjusting screw sleeve is located between the upper limit spring (123) and the upper limit member (121). The lower adjusting screw sleeve is located between the lower limit spring (124) and the lower limit member (122).

7. The warp tension adjustment device according to claim 6, characterized in that: A distance measuring device is installed on the warp letting wall panel (4), and the distance measuring device comprises: a mounting seat, a first distance sensor and a second distance sensor. The warp letting wall panel (4) is installed with a mounting seat located in the horizontal direction, and the mounting seat is installed with a first distance sensor and a second distance sensor spaced apart in the horizontal direction. The first distance sensor is used to detect the distance d1 between the rocker arm (11) and the mounting seat, and the second distance sensor is used to detect the distance d2 between the rocker arm (11) and the mounting seat. The output end of the first distance sensor, the output end of the second distance sensor and the output end of the pressure sensor device (3) are all connected to a tension monitoring device. The pressure sensor device (3) is located between the lower adjusting screw sleeve and the lower limit member (122). The pressure sensor 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 warp easing roller (2) according to the distance d1, the distance d2 and the real-time pressure F1.

8. The warp tension adjustment device according to claim 7, characterized in that: Calculating the tension F2 of the easing roller (2) according to the corrected pressure F5 comprises the following steps: S1. Obtaining test data, including the following steps: S311. Test preparation: an annular pressure sensor is installed on the easing roller (2), and the outer diameter of the annular pressure sensor is equal to the outer diameter of the middle part of the easing roller (2); S312. The warp tension adjustment device works normally, and the outer walls of the easing roller (2) and the annular pressure sensor are bypassed by the warp. During the process, the annular pressure sensor outputs a test pressure F6, and the pressure sensing device (3) obtains a real-time pressure F1. At the same time, the first distance sensor and the second distance sensor respectively obtain the distance d1 and the distance d2; S313. The annular pressure sensor is replaced by an easing ring, and the outer diameter of the easing ring is equal to the outer diameter of the annular pressure sensor, and the weight of the easing ring is equal to that of the annular pressure sensor; S314. End the experiment; S2, calculating the distance-based predicted pressure F0 according to the distance d1 and the distance d2; S3, obtaining a corrected pressure F5 according to the distance-based predicted pressure F0 and the real-time pressure F1; S4. Calculate the tension F2 of the easing roller (2), F2 = a + bF5 + cF5 2 +dF5 3 (Formula 1), where a, b, c, and d are constants, F6 is substituted into F2 in Formula 1 and a, b, c, and d are obtained using the regression model.

9. The warp tension adjusting device according to claim 8, characterized in that: Assuming that the rocker arm (11) 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 axis centerline of the through hole on the rocker arm (11) and the axis center of the fixed shaft (10) is L0, the distance formula prediction pressure F0 is calculated according to the distance d1 and the distance d2 in step S2, including the following steps: S21, calculate the angle a between the rocker arm (11) and the horizontal direction, d0 is the distance between the first distance sensor and the second distance sensor; S22, calculating the distance h0 by which the perforation position in the rocker arm (11) is lowered or raised, S23, calculating the elastic force F3 of the upper limit spring (123) on the rocker arm (11), F3=k1*[L1-(h1-h0)], 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, calculating the elastic force F4 of the lower limit spring (124) on the rocker arm (11), F4=k2*[L2-(h2-h0)], 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 type predicted pressure F0 = F4 + M1 + M2, wherein M1 is the weight of the lower adjusting screw sleeve, and M2 is the weight of the lower limit spring (124).

10. A loom, characterized in that: It comprises a warp tension regulating device as described in any one of claims 1 to 8 and warp letting wall panels (4) arranged on the left and right sides of the loom, wherein the two ends of the warp tension regulating device are respectively arranged on the warp letting wall panels (4) on the left and right sides.

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