CN111041638B - Constant-draft-rate unwinding method and device for passive unwinding type beam - Google Patents
Constant-draft-rate unwinding method and device for passive unwinding type beam Download PDFInfo
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- CN111041638B CN111041638B CN201911363643.1A CN201911363643A CN111041638B CN 111041638 B CN111041638 B CN 111041638B CN 201911363643 A CN201911363643 A CN 201911363643A CN 111041638 B CN111041638 B CN 111041638B
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
- D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
- D02J1/227—Control of the stretching tension; Localisation of the stretching neck; Draw-pins
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Abstract
The invention relates to a constant-draft unwinding method and a constant-draft unwinding device for passive unwinding type warp beams, wherein the method comprises the steps of controlling the rotating speed of each warp beam by adopting brake motors corresponding to the warp beams one by one, adopting independent traction rollers and being driven by a main motor, calculating the target rotating speed of the brake motors according to the rotating speed of the main motor, the transmission ratio of the main motor and the traction rollers, the diameter of the traction rollers, the yarn drafting rate and other parameters, and finally controlling the brake motors to rotate at the target rotating speed by a controller. The device includes warp beam frame, warp beam, carry over pinch rolls and compression roller, and the carry over pinch rolls is by main motor drive, fixedly connected with and warp beam one-to-one's brake motor on the warp beam frame, each brake motor is connected to respectively on a controller, main motor expert is same and controller electric connection. The invention regulates and controls the rotating speed of the warp beam in real time through the brake motors which are in one-to-one correspondence with the warp beam so as to regulate the unwinding linear speed of the yarn, thereby ensuring that the draft rates of all the unwound yarns tend to be consistent.
Description
The technical field is as follows:
the invention belongs to the field of textile machinery, and particularly relates to a constant-draft-rate unwinding method and device for a passive unwinding type warp beam
Background art:
in the production process of the yarn, the process of unwinding the yarn on the warp beam is inevitably involved, the unwinding of the warp beam is usually passive unwinding, that is, a traction device at the downstream of the warp beam pulls the yarn sheet on the warp beam to move, the yarn sheet pulls the warp beam to rotate, the process usually needs to set the draft ratio of the yarn sheet, so that the yarn has certain tension and is not intertwined, therefore, the common method is to arrange a brake sheet and a proportional valve on a warp beam frame, apply force to the brake sheet by using the proportional valve, and apply resistance to the warp beam by using the brake sheet, so that the yarn sheet has certain tension.
Due to the limitation of the number of yarn ends on the warp beam, the number of the yarn ends on a single warp beam is difficult to meet the requirement of the number of weaving warps, so that the yarns on a plurality of warp beams are required to be transferred to one beam to increase the number of the yarn ends on the beam, so that the number of the yarn ends on the beam meets the requirement of cloth on the number of the warps, and then the beam is arranged on a weaving machine for weaving. When transferring yarns from a plurality of beams to a beam, the process of beam unwinding is involved.
In actual operation, due to factors such as abrasion of a brake pad and increase of the number of warp beams, the draft ratios of yarns from different warp beams on a loom beam are different, and finally the draft ratios of the yarns on the loom beam are different, so that the problem that the yarns are wasted due to the fact that the unwinding of a certain warp beam is finished and more or less yarns are left on other warp beams, and meanwhile, the problem that the fabric is not flat is caused due to different tension of the yarns wound on the loom beam by each warp beam.
Therefore, in order to reduce the yarn waste and improve the fabric flatness, it is necessary to stabilize the draft ratio of the yarn on each beam during beam unwinding so that the yarn tension on the loom beam is balanced.
The invention content is as follows:
the invention firstly solves the technical problems that: the constant-draft unwinding method can effectively improve the balance of the draft ratio of the yarn in the passive unwinding process.
In order to solve the technical problems, the invention adopts the technical scheme that: the constant drafting rate unwinding method for passive unwinding type warp beam includes controlling the rotation speed of the warp beams with brake motors corresponding to the warp beams, each brake motor is electrically connected with a controller, the controller controls the rotating speed of the brake motors, an independent traction roller is used as a driving roller to draw yarns on each warp beam, the traction roller is driven to rotate by a main motor, the main motor is electrically connected with the controller and feeds back the rotating speed to the controller, the controller calculates the roller surface linear speed V of the traction roller to be pi MD/Q according to the rotating speed M of the main motor, the transmission ratio Q of the main motor to the traction roller and the diameter D of the traction roller, and calculating the target rotating speed m of the brake motor which is Vq/pi Pd according to the linear speed V of the roller surface of the traction roller, the yarn drafting rate P, the real-time diameter d of a yarn roll on the warp beam and the transmission ratio q of the brake motor and the warp beam, and controlling the brake motor to rotate at the target rotating speed m by the controller.
As a preferred scheme, the controller is a PLC, the brake motor is a servo motor or a stepping motor provided with an encoder, the main motor is a servo motor or a stepping motor provided with an encoder, and the controller is electrically connected with the encoder of the brake motor and the encoder of the main motor respectively.
Preferably, the electric energy generated by the braking motor during braking is fed back to a power supply circuit of the sizing machine through an inverter.
Preferably, the real-time diameter d of the yarn on the warp beam is d0-2h, wherein h is the thickness reduction amount of the yarn detected by the distance sensors corresponding to the warp beams one by one, d0 is the initial diameter of the yarn roll on the warp beam, and d0 is obtained by measurement.
The invention has the beneficial effects that: the invention regulates and controls the rotating speed of the warp beam in real time through the brake motors which are in one-to-one correspondence with the warp beam so as to regulate the unwinding linear speed of the yarn, and through the mode, the brake motors can be respectively controlled through the controller, the proper rotating speed of the warp beam is adjusted according to the real-time diameters of yarn rolls on different warp beams, so that the unwinding speed of the yarn on the warp beam and the traction speed of the traction roller are always kept in a certain proportional relation, the drafting rate of each yarn between the warp beam and the traction roller is always kept constant, and further, the drafting rates of all the unwound yarns tend to be consistent and the tensions are basically the same.
In order to solve the technical problem, the invention adopts another technical scheme that: the constant draft ratio unwinding method of the passive unwinding type warp beam comprises the steps of controlling the rotating speed of each warp beam by adopting a brake motor corresponding to the warp beam one by one, electrically connecting each brake motor with a controller, controlling the rotating speed of each brake motor by the controller, using an independent traction roller as a driving roller to pull yarns on each warp beam, wherein a main motor is in transmission connection with the traction roller, the rotating speed of the main motor is fed back to the controller, a tension sensor is adopted to detect the tension of yarn pieces combined by the warp beams and feed the tension back to the controller, the controller adjusts the rotating speed of each brake motor according to the proportional relation between real-time tension and target tension, and the target tension is set manually according to the unwinding requirement of the yarns.
Preferably, the initial linear speed of the pulling roll is the same as the initial unwinding linear speed of the warp beam package, and then the unwinding linear speed of the warp beam package is adjusted based on the difference between the real-time tension and the target tension.
The beneficial effects of this technical scheme are: the technical scheme also adopts the brake motors which are in one-to-one correspondence with the warp beams to regulate and control the rotating speed of the warp beams in real time so as to regulate the unwinding linear speed of the yarns and ensure that the tension of the yarns tends to be constant in the unwinding process, thereby achieving the technical aim of balancing the drafting effect of single yarns between the traction roller and the warp beams in the unwinding process. According to the technical scheme, all the brake motors are regulated and controlled in the same mode according to the difference value between the actual tension and the target tension of the yarn piece, and the brake device is simpler in structure, simpler in control program and more stable in operation process compared with the technical scheme.
The invention further aims to solve the technical problems that: a constant draft unwinding device of a passive unwinding type warp beam is provided, which can control the rotation speed of the warp beam to make the ratio of the unwinding linear speed of yarn to the linear speed of yarn being drawn to a constant value, thereby controlling the draft ratio of the yarn between the warp beam and a drawing roller to be constant.
In order to solve the technical problems, the invention adopts the technical scheme that: the constant draft ratio unwinding device of passive backing-off type warp beam, including warp beam frame, rotate a plurality of warp beam of connection on warp beam frame and be used for pulling the carry over pinch rolls of the epaxial yarn of warp, the carry over pinch rolls rotates to be connected on the carry over pinch rolls, and the carry over pinch rolls rotates and rotates by main motor drive, still rotates on the carry over pinch rolls to be connected with the compression roller of carry over pinch rolls butt, fixedly connected with and warp beam one-to-one on the warp beam frame, be used for applying the brake motor of brake force to the warp beam, each brake motor is connected to a controller through the first encoder of one-to-one respectively, main motor passes through second encoder and controller electric connection.
As a preferable scheme, distance sensors corresponding to the warp beams one to one are arranged on the warp beam frame, the distance sensors face the axis of the warp beams and are used for detecting the vertical distance from the distance sensors to the surface of the yarn roll, and each distance sensor is electrically connected with the controller respectively.
As a preferable scheme, a tension sensor is arranged between the creel and the traction roller and used for detecting the combined tension of the combined yarn pieces, and the tension sensor is electrically connected with the controller and sends a detection result to the controller.
Preferably, the brake motor is connected to the power supply circuit of the unwinding device via an inverter.
The invention has the beneficial effects that: according to the invention, the rotating speed of the warp beam is regulated and controlled in real time through the brake motors which are in one-to-one correspondence with the warp beam so as to regulate the unwinding linear speed of the yarn. The braking motors are adopted to control the rotating speed more accurately, different control schemes of each braking motor can be designed for different warp beams and different yarn diameters, independent control is achieved, and the drafting rates of all yarns in the unwinding process are guaranteed to meet respective requirements respectively.
The invention further adopts a distance sensor to detect the thickness reduction amount of the yarn roll, thereby calculating the implementation diameter of the yarn roll in the unwinding process according to the original diameter of the yarn roll, calculating the real-time yarn unwinding linear speed of the yarn roll through a controller according to the implementation diameter of the yarn roll, comparing the difference value with the unwinding speed of a traction roller, and adjusting the rotating speed of a speed reducing motor corresponding to a warp beam where the yarn roll is positioned through the controller to enable the difference value to return to a reasonable range. Therefore, the independent control of each speed reducing motor can be realized, and the drafting rate of all yarns in the unwinding process is ensured to be the same and the drafting rate of any yarn in the front body process tends to be stable.
In addition, the invention adopts the tension sensor to detect the combined tension of the yarn sheets, and the uniform rotating speed adjustment is carried out on all the brake motors through the comparison of the detection result and the target tension value, so that the combined tension value detected by the tension sensor is close to the target tension value, and the drafting rate of the yarn in the unwinding process tends to be stable.
The invention further feeds back the electric energy generated by the braking motor in the braking process to the power supply circuit through the inverter, thereby reducing the heating of the motor, simultaneously forming energy recycling and saving energy.
Description of the drawings:
the following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic view showing a specific structure of a constant draft unwinding device of a passive unwinding type beam according to the present invention;
FIG. 2 is an electrical schematic of the constant draft unwind apparatus of the passive unwind type beam of FIG. 1;
FIG. 3 is a schematic view of another embodiment of the constant draft unwinding device of the passive unwinding type beam according to the present invention;
fig. 4 is an electrical schematic of the constant draft unwind apparatus of the passive unwind type beam shown in fig. 3.
In fig. 1 to 4: 1. the yarn tension device comprises a creel, 2, a warp beam, 3, yarns, 4, a traction roller, 5, a traction frame, 6, a main motor, 7, a compression roller, 8, a brake motor, 9, a first encoder, 10, a controller, 11, a second encoder, 12, a distance sensor, 13, a yarn roll, 14, a tension sensor, 15 and an inverter.
The specific implementation mode is as follows:
specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1:
in order to clearly explain the implementation process of the present embodiment, the present embodiment uses fig. 1 and 2 to describe the implementation process in detail.
A constant-draft unwinding method of a passive unwinding type warp beam comprises the steps of controlling the rotating speed of each warp beam 2 by adopting a brake motor 8 corresponding to each warp beam 2 one by one, electrically connecting each brake motor 8 with a controller 10, controlling the rotating speed of each brake motor 8 by the controller 10, using an independent traction roller 4 as a driving roller to draw yarns 3 on each warp beam 2, driving the traction roller 4 to rotate by a main motor 6, electrically connecting the main motor 6 with the controller 10, feeding back the rotating speed to the controller 10 by a second encoder 11, calculating the roller surface linear speed V of the traction roller 4 as pi MD/Q according to the rotating speed M of the main motor 6, the transmission ratio Q of the main motor 6 with the traction roller 4 and the diameter D of the traction roller 4 by the controller 10, and calculating the roller surface linear speed V of the traction roller 4 as pi MD/Q according to the roller surface linear speed V of the traction roller 4, the yarn draft ratio P (determined by a user), and the real-time diameter D and D of yarn rolls (wound rolls) on the warp beams 2, The target rotation speed m of the brake motor 8 is calculated from the transmission ratio q between the brake motor 8 and the beam 2 as Vq/pi Pd, and the controller 10 controls the brake motor 8 to rotate at the target rotation speed m, where the unit of the rotation speed M, m is r/min.
In this embodiment, the controller 10 is a PLC, the brake motor 8 is a servo motor or a stepping motor provided with a first encoder 9, the main motor 6 is a servo motor or a stepping motor provided with a second encoder 11, and the controller 10 is electrically connected to the first encoder 9 of the brake motor 8 and the second encoder 11 of the main motor 6, respectively.
In the present embodiment, the encoders are divided into the first encoder 9 and the second encoder 11 for easy understanding, and actually, the first encoder 9 and the second encoder 11 may be the same or different.
The electric energy generated by the brake motor 8 during braking is fed back to the power supply circuit of the sizing machine through the inverter 15.
The real-time diameter d of the yarn 3 on the warp beam 2 is d0-2h, wherein h is the yarn thickness reduction detected by the distance sensors 12 corresponding to the warp beam 2 one by one, d0 is the initial diameter of the yarn roll 13 on the warp beam 2, and d0 is obtained by measurement.
Example 2:
in order to clearly explain the implementation of the present embodiment, the present embodiment uses fig. 3 and 4 to describe the implementation in detail.
The constant-draft-rate unwinding method of the passive unwinding type warp beam comprises the steps of controlling the rotating speed of each warp beam 2 by adopting a brake motor 8 corresponding to each warp beam 2 one by one, electrically connecting each brake motor 8 with a controller 10, controlling the rotating speed of each brake motor 8 by the controller 10, using an independent traction roller 4 as a driving roller to pull yarns 3 on each warp beam 2, wherein a main motor 6 is connected to the traction roller 4 in a transmission manner, the rotating speed of the main motor 6 is fed back to the controller 10 through a second encoder 11, detecting the tension of yarn pieces combined by the warp beams 2 by using a tension sensor 14 and feeding back to the controller 10, adjusting the rotating speed of each brake motor 8 by the controller 10 according to the proportional relation between real-time tension and target tension, and manually setting the target tension according to yarn unwinding requirements.
In the present embodiment, the encoders are also divided into the first encoder 9 and the second encoder 11 for easy understanding, and actually, the first encoder 9 and the second encoder 11 may be the same or different.
The initial linear speed of the traction roller 4 is consistent with the initial unwinding linear speed of the yarn roll 13 of the warp beam 2, and then the unwinding linear speed of the yarn roll 13 on the warp beam 2 is adjusted according to the difference value between the real-time tension and the target tension, so that the real-time tension tends to the target tension, the tension applied to the yarn at the initial unwinding stage can be reduced, and the variation range of the yarn drafting rate between the warp beam 2 and the traction roller 4 is reduced and tends to be stable in the whole unwinding process of the yarn roll 13 on the warp beam 2.
Example 3:
the present invention relates to a constant draft unwinding device for passive unwinding type warp beam, as shown in fig. 1 and 2, comprising a warp beam frame 1, four warp beams 2 rotatably connected to the warp beam frame 1, and a traction roller 4 for drawing a yarn 3 on the warp beams 2, wherein the traction roller 4 is rotatably connected to the traction frame 5, the present invention has no specific limitation on the structure of the traction frame 5 as long as the traction roller 4 can be fixed without interfering with the movement of the yarn, the traction roller 4 is driven by a main motor 6 to rotate, the traction frame 5 is further rotatably connected with a compression roller 7 abutting against the traction roller 4, the warp beam frame 1 is fixedly connected with brake motors 8 corresponding to the warp beams 2 one by one for applying braking force to the warp beams 2, each brake motor 8 is connected to a controller 10 through a first encoder 9 corresponding to one by one, the main motor 6 is electrically connected to the controller 10 through a second encoder 11, the controller 10 monitors the dynamic information such as the rotating speed, the number of turns and the like of each brake motor 8 and the main motor 6 through the first encoder 9 and the second encoder 11 respectively.
As shown in fig. 1, distance sensors 12 corresponding to the warp beams 2 one by one are provided on the creel 1, the distance sensors 12 face the axial center of the warp beam 2 and detect the vertical distance from the distance sensors 12 to the surface of the yarn package 13, and as shown in fig. 2, the distance sensors 12 are electrically connected to the controller 10, respectively, and send the detection results to the controller 10.
In this embodiment, the brake motor 8 is connected to the power supply circuit of the unwinding device through the inverter 15, so that the electric energy generated by the brake motor 8 during braking can be fed back to the power supply circuit for reuse.
The working process of this embodiment can refer to embodiment 1, and is not described herein again.
Example 4:
the present invention relates to a constant draft unwinding device for passive unwinding type warp beam, as shown in fig. 3 and 4, comprising a warp beam frame 1, four warp beams 2 rotatably connected to the warp beam frame 1, and a traction roller 4 for drawing yarns 3 on the warp beams 2, wherein the traction roller 4 is rotatably connected to the traction frame 5, the present invention has no specific limitation on the structure of the traction frame 5 as long as the traction roller 4 can be fixed without interfering with the movement of the yarns, the traction roller 4 is driven by a main motor 6 to rotate, the traction frame 5 is further rotatably connected with a compression roller 7 abutting against the traction roller 4, the warp beam frame 1 is fixedly connected with brake motors 8 corresponding to the warp beams 2 one by one for applying braking force to the warp beams 2, each brake motor 8 is connected to a controller 10 through a first encoder 9 corresponding to one by one, the main motor 6 is electrically connected to the controller 10 through a second encoder 11, the controller 10 monitors the dynamic information such as the rotating speed, the number of turns and the like of each brake motor 8 and the main motor 6 through the first encoder 9 and the second encoder 11 respectively.
In this embodiment, a tension sensor 14 is provided between the creel 1 and the drawing roll 4, the tension sensor 14 is used for detecting the combined tension of the combined yarn pieces, and the tension sensor 14 is electrically connected to the controller 10 and sends the detection result to the controller 10.
As shown in fig. 4, the brake motor 8 is connected to the power supply circuit of the unwinding device via an inverter 15.
The working process of this embodiment can refer to the constant draft unwinding method of passive unwinding type beam described in embodiment 2, and will not be described herein.
The above embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and are not intended to limit the invention; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.
Claims (7)
1. The constant drafting rate unwinding method of passive unwinding type warp beam features that the braking motors corresponding to the warp beams are used to control the rotation speed of the warp beams, and each brake motor is electrically connected with a controller, the controller controls the rotating speed of the brake motors, an independent traction roller is used as a driving roller to draw the yarns on each warp beam, the traction roller is driven to rotate by a main motor, the main motor is electrically connected with the controller and feeds back the rotating speed to the controller, the controller calculates the roller surface linear speed V = pi MD/Q of the traction roller according to the rotating speed M of the main motor, the transmission ratio Q between the main motor and the traction roller and the diameter D of the traction roller, and calculating a target rotating speed m = Vq/pi Pd of the brake motor according to the linear speed V of the roller surface of the traction roller, the yarn drafting ratio P, the real-time diameter d of a yarn roll on the warp beam and the transmission ratio q of the brake motor and the warp beam, and controlling the brake motor to rotate at the target rotating speed m by the controller.
2. The constant draft unwinding method of a passive unwinding type warp beam according to claim 1, wherein the controller is a PLC, the brake motor is a servo motor or a stepping motor provided with an encoder, the main motor is a servo motor or a stepping motor provided with an encoder, and the controller is electrically connected to the encoder of the brake motor and the encoder of the main motor, respectively.
3. The constant draft unwinding method of a passive unwinding type beam according to claim 1, wherein the electric energy generated by the brake motor when braking is fed back to the power supply circuit of the slasher through an inverter.
4. The constant draft unwinding method of passive unwinding type warp beam according to claim 1, characterized in that the real time diameter of the yarn on the beam d = d0-2h, where h is the amount of thickness reduction of the yarn detected by the distance sensors in one-to-one correspondence with the beam, d0 is the initial diameter of the package on the beam, d0 is obtained by measurement.
5. The constant-draft-rate unwinding device of the passive unwinding type warp beam comprises a warp beam frame (1), a plurality of warp beams (2) rotatably connected to the warp beam frame (1) and a traction roller (4) used for drawing yarns (3) on the warp beams (2), wherein the traction roller (4) is rotatably connected to a traction frame (5), the traction roller (4) is driven by a main motor (6) to rotate, the traction frame (5) is also rotatably connected with a compression roller (7) abutted to the traction roller (4), the constant-draft-rate unwinding device is characterized in that the warp beam frame (1) is fixedly connected with brake motors (8) which are in one-to-one correspondence with the warp beams (2) and used for applying braking force to the warp beams (2), each brake motor (8) is respectively connected to a controller (10) through a first encoder (9) in one-to-one correspondence, and the main motor (6) is electrically connected with the controller (10) through a second encoder (11), the warp beam frame (1) is provided with distance sensors (12) which correspond to the warp beams (2) one by one, the distance sensors (12) face to the axis of the warp beams (2) and are used for detecting the vertical distance from the distance sensors (12) to the surface of a yarn roll (13), and each distance sensor (12) is electrically connected with the controller (10) respectively.
6. The constant draft unwinding device of a passive-unwinding type warp beam according to claim 5, characterized in that a tension sensor (14) is arranged between the beam frame (1) and the pulling roll (4), the tension sensor (14) is used for detecting the combined tension of the combined yarn pieces, the tension sensor (14) is electrically connected with the controller (10) and sends the detection result to the controller (10).
7. The constant-draft unwinding device of a passive-unwinding type warp beam according to claim 5, characterized in that said braking motor (8) is connected to the power supply circuit of the unwinding device through an inverter (15).
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| CN114990754A (en) * | 2022-07-15 | 2022-09-02 | 河南光远新材料股份有限公司 | Method for two-axis doubling of electronic grade glass fiber yarn doubling machine and application thereof |
| CN115339963B (en) * | 2022-08-19 | 2024-04-26 | 江苏祥盛宜江智能科技有限公司 | Intelligent control method and device for unwinding length of multiple warp beams of interconnected high-precision sizing machine |
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| EP2933364A1 (en) * | 2014-04-17 | 2015-10-21 | Karl Mayer Textilmaschinenfabrik GmbH | Device for applying liquor to a filament web |
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