CN111573416B - Constant tension yarn controlled let-off mechanism and control method - Google Patents
Constant tension yarn controlled let-off mechanism and control method Download PDFInfo
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- CN111573416B CN111573416B CN202010480739.2A CN202010480739A CN111573416B CN 111573416 B CN111573416 B CN 111573416B CN 202010480739 A CN202010480739 A CN 202010480739A CN 111573416 B CN111573416 B CN 111573416B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
- B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/02—Rotary devices, e.g. with helical forwarding surfaces
- B65H51/04—Rollers, pulleys, capstans, or intermeshing rotary elements
- B65H51/06—Rollers, pulleys, capstans, or intermeshing rotary elements arranged to operate singly
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
- B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
- B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
- B65H2515/30—Forces; Stresses
- B65H2515/31—Tensile forces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Looms (AREA)
- Warping, Beaming, Or Leasing (AREA)
Abstract
The invention relates to the technical field of rapier looms, in particular to a constant-tension yarn-controlling let-off mechanism which comprises a let-off roller, a back beam, a force transmission rod and a support plate, wherein warps break away from the let-off roller and sequentially pass through the back beam and the force transmission rod. The effect of accurately adjusting the tension of a single warp is achieved.
Description
Technical Field
The invention relates to the technical field of rapier looms, in particular to a let-off mechanism and a control method for controlling constant tension of yarns.
Background
The rapier loom is the most widely used shuttleless loom at present, can adapt to weft insertion of various yarns, and is widely applied to weaving of sofa cloth. The rapier loom consists of a warp beam, a warp let-off device, a working platform, a weft feeder and a cloth rolling device, wherein warp yarns on the warp beam enter the working platform through the warp let-off device, are woven with weft yarns fed by the weft feeder into a roll, and are finally rolled into a finished product through the cloth rolling device.
The prior let-off device can refer to the invention patent with the publication number of CN105220322B, and comprises a let-off roller, a back beam, a dowel bar, bracket plates and a tension detection unit, wherein the let-off roller, the back beam and the dowel bar are all fixed between the two bracket plates, the let-off roller, the back beam and the dowel bar are horizontally arranged in parallel, and when in let-off, warp yarns are separated from the let-off roller and sequentially pass through the back beam and the dowel bar. The tension detection units are arranged at two ends of the dowel bar and used for measuring stress of the dowel bar, namely the sum of tension born by the warp yarns.
The existing technology has the disadvantages that the number of warps on the let-off roll is large, the tension born by each warp is different in the let-off process, the tension detection unit can only measure the sum of the tensions of all the warps, and only can adjust the let-off speed of the let-off roll to adjust the tension born by the warps, if the tension of a single warp is too large and the tensions of other warps are moderate, the detection and adjustment are difficult, and the single warp with large tension is broken for a long time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a constant tension control let-off mechanism and a constant tension control method for yarns, so that the tension control structure of the warp yarns is optimized, and the effect of accurately adjusting the tension of single warp yarns is achieved.
The invention aims to be realized by the following technical scheme:
a constant tension controlled let-off mechanism for yarn is composed of a let-off roller, a back beam, a force transfer rod, two supporting plates, a tension control structure, the tension control structure comprises a supporting rod, supporting plates, supporting rollers and springs, wherein the supporting rod is horizontally arranged and fixedly connected with the support plate, multiple groups of supporting rollers are arranged on the supporting rod, two ends of each group of supporting rollers are connected with the supporting plates, the upper ends of the supporting plates are fixedly connected with the supporting rods, vertical adjusting grooves are formed in the supporting plates, moving blocks are arranged at two ends of each supporting roller, the moving blocks are vertically matched with the adjusting grooves in a sliding mode, the supporting rollers are rotatably connected with the moving blocks, and two ends of each spring are fixedly connected with the moving blocks and the end portions of the adjusting grooves respectively.
By adopting the technical scheme, the warp yarns are separated from the let-off roll and sequentially bypass the back beam, the dowel bar and the supporting roll, when the let-off starts, the warp yarns can apply pressure to the supporting roll, the supporting roll drives the moving block to move along the adjusting groove at the moment, the balance is kept under the elastic force action of the spring, and once the tension of the warp yarns is too large or too small, the warp yarns can both drive the supporting roll to move relative to the supporting plate, so that the effect of accurately adjusting the tension of single warp yarn is achieved.
The present invention in a preferred example may be further configured to: the side edge of the moving block is rotatably connected with a roller which is in rolling contact with the side wall of the adjusting groove.
By adopting the technical scheme, the friction force between the moving block and the adjusting groove can be reduced, and the sensitivity of the supporting roller for adjusting the warps is improved.
The present invention in a preferred example may be further configured to: the circumferential surface of the supporting roller is provided with a containing groove for containing warp yarns.
Through adopting above-mentioned technical scheme, the warp is blockked by the storage tank, can reduce the possibility that the warp takes off the groove.
The present invention in a preferred example may be further configured to: the let-off mechanism further comprises a tension detector, the tension detector is fixedly connected with the support plate, the dowel bar is rotatably connected with the tension detector, and the tension detector controls the let-off speed of the let-off roller through the controller.
By adopting the technical scheme, the tension detector can detect the tension applied to the force transmission rod by all the warps, and when the total tension is too large, the rotating speed of the let-off roller is timely increased so as to increase the length of the warp in the conveying process and reduce the total tension of the warps; when the overall tension of the warp threads is too small, the rotating speed of the let-off roll is timely reduced, and therefore the overall tension of the warp threads is improved.
The present invention in a preferred example may be further configured to: the photoelectric emitter and the photoelectric receiver are fixedly arranged on the support plate and are respectively fixed on the support plates at two ends of the supporting rod, light rays generated by the photoelectric emitter penetrate through all the adjusting grooves, and the light rays are located below the moving block.
By adopting the technical scheme, when the tension of a single warp is too large, the supporting roller and the moving block can be driven to slide along the adjusting groove until the optical signal of the photoelectric emitter is shielded, the photoelectric receiver cannot receive the optical signal generated by the photoelectric emitter, the photoelectric receiver feeds back information to the controller, and the controller controls the rotation speed of the let-off roller to be gradually increased until the photoelectric receiver receives the optical signal of the photoelectric emitter again, so that the condition that the tension of the single warp is too large and exceeds a limit value is avoided.
The invention aims to be realized by the following technical scheme:
a control method for controlling constant tension of yarn comprises the following steps:
the method comprises the following steps: calculating the safe tension of the warp according to the material and the thickness of the warp, determining the safe position of the support roller in the accommodating groove according to the safe tension, and adjusting the positions of the photoelectric emitter and the photoelectric receiver to enable the light emitted by the photoelectric emitter to be positioned at the safe position of the support roller in the accommodating groove;
step two: the controller continuously receives signals of the photoelectric receiver, when the photoelectric receiver cannot receive optical signals generated by the photoelectric transmitter, the photoelectric receiver feeds back information to the controller, and the controller controls the gradual increase of the rotating speed of the let-off roller until the photoelectric receiver receives the optical signals of the photoelectric transmitter again.
By adopting the technical scheme, in the process of adjusting single warp by the tension control structure, the warp can be timely controlled when reaching the limit tension, and the tension of the warp is reduced by improving the rotating speed of the let-off roll, so that the possibility of warp breakage is reduced.
The present invention in a preferred example may be further configured to: in the first step, the safe tension of all warp yarns is calculated according to the material and thickness of the warp yarns at the same time, and the maximum tension threshold value preset in a controller is determined; the tension value on the tension detector is fed back to the controller in real time, and under the condition that the photoelectric receiver can receive the photoelectric emitter, when the value of the tension detector exceeds a maximum threshold value preset by the controller, the controller controls the rotation speed of the let-off roll to be gradually increased until the value of the tension detector is between the maximum threshold value and a minimum threshold value; when the value of the tension detector is smaller than the minimum threshold value preset by the controller, the controller gradually reduces the rotating speed of the let-off roll until the value of the tension detector is between the maximum threshold value and the minimum threshold value.
Through adopting above-mentioned technical scheme, when the total tension of warp is too little, can in time reduce the rotational speed of let-off roll to promote the tension of warp, also can avoid the whole tension of warp too big simultaneously.
In summary, the present invention has the following technical effects:
1. by arranging the tension control mechanism, the effect of accurately adjusting the tension of each warp is achieved;
2. through setting up photoemitter and photoelectric receiver, can in time adjust when the tension of single warp is too big.
Drawings
FIG. 1 is a schematic three-dimensional structure of the present embodiment;
FIG. 2 is an enlarged view of FIG. 1 taken at detail A;
FIG. 3 is a schematic cross-sectional view showing the structure of the roller.
In the figure, 1, let-off roll; 2. a rear beam; 3. a dowel bar; 4. a mounting plate; 41. a photo-emitter; 42. a photoelectric receiver; 5. a tension control structure; 51. a support bar; 52. a support plate; 521. an adjustment groove; 53. a support roller; 531. a containing groove; 54. a spring; 55. a moving block; 551. a roller; 6. a tension detector.
Detailed Description
The first embodiment is as follows:
as shown in fig. 1, the present embodiment introduces a constant tension yarn-controlled let-off mechanism, which includes a let-off roller 1, a back beam 2, a dowel bar 3, support plates 4 and a tension control structure 5, wherein the let-off roller 1, the back beam 2 and the dowel bar 3 are all rotatably connected between the two support plates 4, the let-off roller 1, the back beam 2 and the dowel bar 3 are horizontally arranged in parallel, and the tension control structure 5 is located between the two support plates 4. The warp yarns are separated from the let-off roller 1 and then sequentially pass through the back beam 2, the dowel bar 3 and the tension control structure 5, and each warp yarn can be subjected to tension adjustment at the tension control structure 5, so that the tension of each warp yarn is approximately balanced, and the woven cloth is smoother.
As shown in fig. 2, the tension control structure 5 includes a support rod 51, a support plate 52, support rollers 53 and a spring 54, the support rod 51 is horizontally disposed and fixedly connected to the support plate 4, multiple sets of support rollers 53 are disposed on the support rod 51, both ends of each set of support rollers 53 are connected to the support plate 52, the upper end of the support plate 52 is fixedly connected to the support rod 51, a vertical adjustment groove 521 is disposed on the support plate 52, both ends of the support rollers 53 are provided with moving blocks 55, the moving blocks 55 are vertically slidably engaged with the adjustment grooves 521, the support rollers 53 are rotatably connected to the moving blocks 55, and both ends of the spring 54 are respectively fixedly connected to the moving blocks 55 and the ends of the adjustment grooves 521. When the let-off starts, the warp applies pressure to the supporting roller 53, at the moment, the supporting roller 53 drives the moving block 55 to move along the adjusting groove 521, the balance is kept under the elastic force of the spring 53, once the tension of the warp is increased or decreased, the warp can drive the supporting roller 53 to move relative to the supporting plate 52, the tightness degree of the warp is adjusted, and therefore the effect of accurately adjusting the tension of a single warp is achieved.
The tension of the warp cannot be adjusted without limitation only by the warp driving the supporting roller 53 and the moving block 55 to move in the adjusting groove 521, and when the tension of a single warp is too large, the moving block 55 is continuously driven to move in the adjusting groove 521, so that the tension applied to the supporting roller 53 by the warp is balanced with the elastic force of the spring 54, but the adjusting effect is gradually reduced along with the gradual stretching of the spring 54, and finally the warp is broken due to the too large tension. In order to avoid the above situation, as shown in fig. 1, a photo-emitter 41 and a photo-receiver 42 may be fixedly disposed on the supporting frame plate 4, the photo-emitter 41 and the photo-receiver 42 are respectively fixed on the supporting frame plate 4 at both ends of the supporting rod 51, the light generated by the photo-emitter 41 passes through all the adjusting grooves 521, and the light is located below the moving block 55. When the tension of a single warp is too large, the supporting roller 53 and the moving block 55 are driven to slide along the adjusting groove 521 until the optical signal of the photoelectric emitter 41 is shielded, the photoelectric receiver 42 cannot receive the optical signal generated by the photoelectric emitter 41, the photoelectric receiver 42 feeds back information to the controller, and the controller controls to gradually increase the rotating speed of the let-off roller 1 until the photoelectric receiver 42 receives the optical signal of the photoelectric emitter 41 again, so that the situation that the tension of the single warp exceeds a limit value due to the fact that the tension of the single warp is too large is avoided.
Meanwhile, when the warp is too loose, the tension control structure 5 is difficult to adjust the tension of the warp, as shown in fig. 1, a tension detector 6 can be arranged, the tension detector 6 is fixedly connected with the bracket plate 4, the dowel bar 3 is rotatably connected with the tension detector 6, and the tension detector 6 controls the let-off speed of the let-off roller 1 through a controller. The tension detector 6 can detect the tension applied by all warp yarns to the force transmission rod 3, and when the overall tension is too large, the rotating speed of the let-off roller 1 is timely increased to increase the length of the warp yarns in the conveying process so as to reduce the overall tension of the warp yarns; when the overall tension of the warp threads is too small, the rotating speed of the let-off roll 1 is timely reduced, so that the overall tension of the warp threads is improved.
As shown in fig. 3, in order to increase the sensitivity of the moving block 55 to slide in the adjustment groove 521, a plurality of rollers 551 may be rotatably connected to the side of the moving block 55, the rollers 551 are in rolling contact with the side walls of the adjustment groove 521, and the rollers 551 can reduce the friction between the moving block 55 and the adjustment groove 521, thereby increasing the sensitivity of the support rollers to adjust the warp.
As shown in fig. 2, the circumferential surface of the support roller 53 may be provided with a receiving groove 531 for receiving the warp, and at this time, the warp is blocked by the receiving groove 531, so that the possibility of the warp being separated from the receiving groove can be reduced.
Example two:
the embodiment introduces a control method for controlling constant tension of yarn, which comprises the following steps:
the method comprises the following steps: calculating the safe tension of the warp according to the material and the thickness of the warp, determining the safe position of the supporting roller 53 in the accommodating groove 531 according to the safe tension, and adjusting the positions of the photoelectric emitter 41 and the photoelectric receiver 42 so that the light emitted by the photoelectric emitter 41 is positioned at the safe position of the supporting roller 53 in the accommodating groove 531;
step two: the controller continuously receives the signal of the photoelectric receiver 42, when the photoelectric receiver 42 cannot receive the optical signal generated by the photoelectric emitter 41, the photoelectric receiver 42 feeds back the information to the controller, and the controller controls to gradually increase the rotating speed of the let-off roll 1 until the photoelectric receiver 42 receives the optical signal of the photoelectric emitter 41 again.
Meanwhile, in the first step, the safe tension of all the warp yarns can be calculated according to the material and thickness of the warp yarns, and the maximum tension threshold value preset in the controller is determined; the tension value on the tension detector 6 is fed back to the controller in real time, and under the condition that the photoelectric receiver 42 can receive the photoelectric emitter 41, when the value of the tension detector 6 exceeds a maximum threshold value preset by the controller, the controller controls to gradually increase the rotating speed of the let-off roll 1 until the value of the tension detector 6 is between the maximum threshold value and the minimum threshold value; when the value of the tension detector 6 is smaller than the minimum threshold value preset by the controller, the controller gradually reduces the rotating speed of the let-off roll 1 until the value of the tension detector 6 is between the maximum threshold value and the minimum threshold value.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (4)
1. A constant tension controlled let-off mechanism for yarns comprises a let-off roller (1), a back beam (2), a dowel bar (3) and support plates (4), wherein the let-off roller (1), the back beam (2) and the dowel bar (3) are rotatably connected between the two support plates (4), the let-off roller (1), the back beam (2) and the dowel bar (3) are horizontally arranged in parallel, warp yarns are separated from the let-off roller (1) and sequentially pass through the back beam (2) and the dowel bar (3), the constant tension controlled let-off mechanism is characterized by further comprising a tension control structure (5), the tension control structure (5) comprises a support rod (51), a support plate (52), support rollers (53) and a spring (54), the support rod (51) is horizontally arranged and fixedly connected with the support plates (4), a plurality of groups of support rollers (53) are arranged on the support rod (51), and two ends of each group of support rollers (53) are connected with the support plates (52), the upper end of the supporting plate (52) is fixedly connected with the supporting rod (51), the supporting plate (52) is provided with a vertical adjusting groove (521), two ends of the supporting roller (53) are respectively provided with a moving block (55), the moving block (55) is vertically matched with the adjusting groove (521) in a sliding manner, the supporting roller (53) is rotatably connected with the moving block (55), and two ends of the spring (54) are respectively fixedly connected with the moving block (55) and the end part of the adjusting groove (521); the circumferential surface of the supporting roller (53) is provided with a containing groove (531) for containing warp yarns; the let-off mechanism further comprises a tension detector (6), the tension detector (6) is fixedly connected with the support plate (4), the dowel bar (3) is rotatably connected with the tension detector (6), and the tension detector (6) controls the let-off speed of the let-off roller (1) through a controller; a photoelectric emitter (41) and a photoelectric receiver (42) are fixedly arranged on the support plate (4), the photoelectric emitter (41) and the photoelectric receiver (42) are respectively fixed on the support plate (4) at two ends of the support rod (51), light rays generated by the photoelectric emitter (41) penetrate through all the adjusting grooves, and the light rays are positioned below the moving block (55).
2. A constant tension controlled let-off mechanism according to claim 1, characterized in that the side of the moving block (55) is rotatably connected with a roller (551), and the roller (551) is in rolling contact with the side wall of the adjusting groove (521).
3. A method for controlling constant tension control of a yarn using the let-off mechanism according to claim 1, characterized by the steps of: calculating the safe tension of the warp according to the material and the thickness of the warp, determining the safe position of the support roller (53) in the accommodating groove (531) according to the safe tension, and adjusting the positions of the photoelectric emitter (41) and the photoelectric receiver (42) so that the light emitted by the photoelectric emitter (41) is positioned at the safe position of the support roller (53) in the accommodating groove (531); step two: the controller continuously receives signals of the photoelectric receiver (42), when the photoelectric receiver (42) cannot receive the optical signals generated by the photoelectric emitter (41), the photoelectric receiver (42) feeds back information to the controller, and the controller controls the rotation speed of the let-off roll (1) to be gradually increased until the photoelectric receiver (42) receives the optical signals of the photoelectric emitter (41) again.
4. A method for controlling constant tension of yarns according to claim 3, characterized in that in the step one, the safe tension of all warp yarns is calculated according to the material and thickness of the warp yarns at the same time, and the maximum tension threshold value preset in the controller is determined; the tension value on the tension detector (6) is fed back to the controller in real time, and under the condition that the photoelectric receiver (42) can receive the photoelectric emitter (41), when the value of the tension detector (6) exceeds a maximum threshold value preset by the controller, the controller controls the rotating speed of the let-off roll (1) to be gradually increased until the value of the tension detector (6) is between the maximum threshold value and a minimum threshold value; when the value of the tension detector (6) is smaller than the minimum threshold value preset by the controller, the controller gradually reduces the rotating speed of the let-off roll (1) until the value of the tension detector (6) is between the maximum threshold value and the minimum threshold value.
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| CN202010480739.2A CN111573416B (en) | 2020-05-30 | 2020-05-30 | Constant tension yarn controlled let-off mechanism and control method |
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| CN202010480739.2A CN111573416B (en) | 2020-05-30 | 2020-05-30 | Constant tension yarn controlled let-off mechanism and control method |
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| CN111573416A CN111573416A (en) | 2020-08-25 |
| CN111573416B true CN111573416B (en) | 2021-10-26 |
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| CN113123003B (en) * | 2021-03-29 | 2023-03-10 | 南京玻璃纤维研究设计院有限公司 | Self-adaptive yarn slicing tension control device and three-dimensional fabric loom |
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| CN206015216U (en) * | 2016-08-25 | 2017-03-15 | 江苏德顺纺织有限公司 | A kind of loom let-off mechanism |
| CN208379102U (en) * | 2018-07-18 | 2019-01-15 | 桐乡市康吉织造有限公司 | A kind of ventilated bacterium-suppressing fiber washs sticky cloth weaving warping machine |
| CN208747375U (en) * | 2018-08-07 | 2019-04-16 | 台山宝捷弹性织物厂有限公司 | A kind of yarn is drawn through the tenslator of machine |
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