A yarn bundle twisting apparatus

Abstract

The present application relates to the technical field of twisting, in particular to a yarn bundle twisting equipment. The present application provides a yarn bundle twisting equipment, which comprises an unwinding device, a yarn guide device and a twisting device. The unwinding device is in a columnar shape, and an unwinding yarn tube with a yarn to be twisted is sleeved on the unwinding device. The yarn guide device comprises at least one pulley, and the yarn to be twisted is adjusted in direction by the pulley to enter the twisting device for twisting. The axis of the unwinding device is parallel to the axial direction of the pulley, so that the yarn to be twisted is tangent to the unwinding yarn tube and the pulley. The axis of the unwinding device is parallel to the axial direction of the pulley, so that the yarn to be twisted will not rotate in the process of being transmitted from the unwinding device to the pulley, and no twist is introduced into the yarn to be twisted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of twisting, in particular to a yarn bundle twisting device. BACKGROUND

[0002] The yarn bundle automatic winding device is a device for twisting the yarn bundle. Some large-tow yarns are mainly applied to the field of composite materials, and the yarns can be well woven after low-twist twisting, and finally composed into products with good mechanical properties.

[0003] In the related art, when the yarn bundle with low twist is twisted, the twist of the yarn bundle will be uneven even if a small fluctuation occurs, because the twist is low.

[0004] Therefore, in view of the above problems, there is an urgent need for a yarn bundle twisting device that can ensure the uniformity of the twist of the yarn bundle when twisting the yarn bundle with low twist. SUMMARY

[0005] The embodiment of the present application provides a yarn bundle twisting device, which can ensure the uniformity of the twist of the yarn bundle when twisting the yarn bundle with low twist.

[0006] The embodiment of the present application provides a yarn bundle twisting device, which comprises an unwinding device, a yarn guide device and a twisting device.

[0007] The unwinding device is columnar, and an unwinding yarn pipe for winding the yarn to be twisted is arranged on the unwinding device, the yarn guide device comprises at least one pulley, the yarn to be twisted is adjusted in direction by the pulley and enters the twisting device for twisting, and the axis of the unwinding device is parallel to the axial direction of the pulley, so that the yarn to be twisted is tangent to the unwinding yarn pipe and the pulley.

[0008] In a possible design, the unwinding device is connected with the rotating shaft of a constant tension motor, and the constant tension motor is used to keep the tension of the yarn to be twisted constant.

[0009] In a possible design, the constant tension motor keeps the tension of the yarn to be twisted constant in the following manner:

[0010] The mapping relationship between the torque of the constant tension motor and the external damping is calibrated;

[0011] The constant damping is determined according to the preset constant tension;

[0012] The variable damping is calculated according to the weight loss of the yarn to be twisted on the unwinding yarn pipe;

[0013] The constant damping is corrected according to the variable damping to obtain a corrected damping;

[0014] The torque of the constant tension motor is adjusted according to the modified damping, and the external damping is the modified damping to make the tension of the yarn to be twisted constant.

[0015] In a possible design, the weight loss is determined by the size of the yarn, the yarn feeding speed and the yarn feeding time.

[0016] In a possible design, the twisting device comprises a roller transmission device, a frame device and a spindle.

[0017] The roller transmission device is used to receive the yarn to be twisted introduced by the pulley, and control the speed of the yarn to be twisted fed to the frame device, the frame device is annular and is provided with a yarn hook, the yarn to be twisted fed by the roller transmission device is wound on a twisted yarn tube on the spindle through the yarn hook, the spindle is arranged at the center of the frame device, the twisted yarn tube is arranged vertically at the center of the spindle, the spindle is rotatable and movable up and down, the yarn hook drives the yarn to be twisted to rotate around the spindle for twisting, and the spindle drives the twisted yarn tube to rotate to wind the twisted yarn on the twisted yarn tube.

[0018] In a possible design, the roller transmission device comprises an upper roller and a lower roller which are both cylindrical, the yarn to be twisted passes between the upper roller and the lower roller, and the feeding of the yarn to be twisted is controlled by rotating the upper roller.

[0019] When the yarn is twisted:

[0020] The rotating speed of the upper roller and / or the spindle is adjusted according to the diameter of the twisted yarn tube after winding to keep the twist of the yarn unchanged.

[0021] In a possible design, the rotating speed of the upper roller and / or the spindle is adjusted according to the diameter of the twisted yarn tube after winding to keep the twist of the yarn unchanged, which comprises:

[0022] A change preset value is set;

[0023] The rotating speed of the upper roller and / or the spindle is adjusted to keep the twist of the yarn unchanged every time the diameter of the twisted yarn tube after winding changes by the change preset value.

[0024] In a possible design, the change of the diameter of the twisted yarn tube after winding is determined according to the length of the yarn to be twisted fed and the diameter of the twisted yarn tube.

[0025] In a possible design, there is a wrap angle between the pulley and the yarn to be twisted.

[0026] In a possible design, a speed sensor is further included for testing the feeding speed of the yarn to be twisted.

[0027] Compared with the prior art, the present application has at least the following beneficial effects:

[0028] In the embodiment, the axis of the unwinding device is parallel to the axis of the pulley, so that the yarn to be twisted will not rotate during the transmission from the unwinding device to the pulley, and thus no twist is introduced to the yarn to be twisted. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0030] Figure 1 is a front view structural schematic diagram of a yarn bundle twisting device provided by the embodiment of the present application;

[0031] Figure 2 is a side view structural schematic diagram of a yarn bundle twisting device provided by the embodiment of the present application;

[0032] Figure 3 is a yarn guide direction comparison diagram provided by the embodiment of the present application;

[0033] Figure 4 is a structural schematic diagram of a yarn guide device provided by the embodiment of the present application;

[0034] Figure 5 is a structural schematic diagram of an unwinding bobbin provided by the embodiment of the present application;

[0035] Figure 6 is a structural schematic diagram of a twisting device provided by the embodiment of the present application.

[0036] In the drawings:

[0037] 1- unwinding device;

[0038] 11- unwinding bobbin;

[0039] 2- yarn guide device;

[0040] 21- pulley;

[0041] 3- twisting device;

[0042] 31- roller transmission device;

[0043] 311- upper roller;

[0044] 312 - lower roller;

[0045] 313 - speed sensor;

[0046] 32 - program device;

[0047] 33 - spindle;

[0048] 34 - twisted tube. DETAILED DESCRIPTION

[0049] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0050] In the description of the embodiments of the present application, unless explicitly defined and limited, the terms "first", "second" are only for the purpose of description and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated, the term "multiple" means two or more; the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can be detachable connection, or integrally connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the description of the present specification, it is to be understood that the "upper", "lower" and the like described in the embodiments of the present application are described from the angle shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is to be understood that when referring to an element connected to another element "on" or "under", it can be directly connected to another element "on" or "under", or indirectly connected to another element "on" or "under" through an intermediate element.

[0052] As shown in Figure 1 and Figure 2 The embodiments of the present application provide a bundle twisting device, which comprises an unwinding device 1, a guide device 2 and a twisting device 3.

[0053] The unwinding device 1 is columnar, and the unwinding tube 11, on which the yarn to be twisted is wound, is sleeved. The yarn guiding device 2 includes at least one pulley 21. The yarn to be twisted is adjusted in direction by the pulley 21 and enters the twisting device 3 for twisting. The axis of the unwinding device 1 is parallel to the axis of the pulley 21 so that the yarn to be twisted is tangent to both the unwinding tube 11 and the pulley 21.

[0054] In this embodiment, the axis of the unwinding device 1 is parallel to the axis of the pulley 21, so that the yarn to be twisted will not rotate during the process of being transferred from the unwinding device 1 to the pulley 21, and thus no twist will be introduced into the yarn to be twisted.

[0055] It should be noted that in the prior art, the axis of the unwinding tube 11 is perpendicular to the axis of the pulley 21, which causes the yarn to be twisted to exit axially. As a result, twist is introduced during the process of the yarn to be twisted being transferred from the unwinding device 1 to the pulley 21. Furthermore, as the thickness of the yarn to be twisted wrapped on the unwinding tube 11 decreases, the introduced twist will increase, ultimately resulting in uneven twist of the twisted yarn.

[0056] Specifically, please refer to Figure 3 The introduced twist value is T0 = 1 / (πD), where T0 is the introduced twist and D is the current diameter of the yarn to be twisted on the unwinding tube 11. Obviously, as the yarn length increases, the value of D decreases and the introduced twist gradually increases. Moreover, the direction of the introduced twist changes with the installation direction of the yarn tube. Under the influence of various factors, the twist variation coefficient will be large when twisting at low twist.

[0057] like Figure 4 The pulley 21 is mainly composed of a ceramic outer wheel surface, a bearing, a shaft, a separator washer, and a mounting plate. The ceramic outer wheel surface is a smooth and wear-resistant ceramic U-shaped or V-shaped wheel surface, and the size of the wheel groove matches the yarn. The bearing connects the ceramic outer wheel surface to the shaft, making the ceramic outer wheel surface rotate smoothly. The separator washer is placed against the bearing to separate the wheel group, ensuring smooth rotation between multiple wheel groups. The mounting plate installs multiple sets of pulleys 21 onto the yarn feeding frame.

[0058] In some embodiments of the present invention, the unwinding device 1 is connected to the rotating shaft of a constant tension motor, and the tension of the yarn to be twisted is kept constant by the constant tension motor.

[0059] In this embodiment, the greater the tension of the twisting and unwinding, the more obvious the fuzz on the surface of the twisted yarn, and the greater the yarn damage. When twisting the ply, if the tension of each yarn is uneven, the ply yarn will be loose and tight, affecting the product quality. With the constant tension control of the unwinding device 1, the yarn can be guaranteed to have low damage and high quality consistency at high speed.

[0060] In some embodiments of the present invention, the constant tension motor maintains a constant tension in the yarn to be twisted by means of:

[0061] calibrating the mapping relationship between the torque of the constant tension motor and the external damping;

[0062] determining the constant damping according to the preset constant tension;

[0063] calculating the variable damping according to the weight loss of the to-be-twisted yarn on the unwinding yarn tube 11;

[0064] correcting the constant damping according to the variable damping to obtain the corrected damping;

[0065] adjusting the torque of the constant tension motor according to the corrected damping, so that the external damping is the corrected damping to make the tension of the to-be-twisted yarn constant.

[0066] In the embodiment, first, the mapping relationship between the torque of the constant tension motor and the external damping is calibrated; the preset constant tension is set according to the requirement; the tension and the damping are consistent, and the tension needs to be kept constant, which requires that the damping needs to be kept constant. By keeping the torque constant, the damping can be kept constant, and then the tension can be kept constant. However, as the to-be-twisted yarn is output, the weight of the to-be-twisted yarn on the unwinding yarn tube 11 decreases constantly, which leads to the change of the damping, and then the tension of the yarn cannot be kept constant. In order to keep the tension constant, the variable damping needs to be calculated according to the weight loss of the to-be-twisted yarn, and the constant damping needs to be corrected according to the variable damping to obtain the corrected damping. The torque of the constant tension motor is adjusted according to the corrected damping and the mapping relationship, so that the external damping is the corrected damping to make the tension of the to-be-twisted yarn constant.

[0067] It should be noted that the relationship between the change of the mass on the unwinding yarn tube 11 and the change of the damping can be determined according to experiments.

[0068] As shown in FIG. 1, the constant tension motor is provided with a motor shaft, and the motor shaft is connected to a motor body. Figure 5 The motor shaft of the constant tension motor extends for a long distance, and the shape of the extended end of the motor shaft is a hexagon, forming a mandrel. The mandrel is inserted into a main body of the unwinding device 1 and a plastic core barrel, and drives the core barrel to rotate. The plastic core barrel is a hollow structure, which reduces the overall weight. The core has a through hexagonal hole matched with the mandrel, and the outer surface side has a plurality of pairs of groove groups. Each pair of groove groups is provided with a curved spring sheet. When in use, the unwinding yarn tube 11 is inserted into the core barrel, the spring sheet is squeezed and bent, and the unwinding yarn tube 11 is prevented from slipping relative to the spring sheet.

[0069] In some embodiments of the present application, the weight loss is determined by the size of the yarn, the yarn feeding speed and the yarn feeding time.

[0070] In the embodiment, the change of the mass on the unwinding yarn tube 11 can be calculated according to the output length of the yarn, and the output length of the yarn can be determined according to the yarn feeding speed and the yarn feeding time.

[0071] As shown in FIG. 1, the constant tension motor is provided with a motor shaft, and the motor shaft is connected to a motor body. Figure 6In some embodiments of the present application, the twisting device 3 comprises a roller transmission device 31, a program device 32 and a spindle 33;

[0072] The roller transmission device 31 is used to receive the yarn to be twisted introduced by the pulley 21, and control the speed of the yarn to be twisted fed to the program device 32. The program device 32 is annular and is provided with a yarn hook. The yarn to be twisted fed by the roller transmission device 31 is wound on the twisted yarn tube 34 on the spindle 33 through the yarn hook. The spindle 33 is arranged at the center of the program device 32. The twisted yarn tube 34 is arranged vertically at the center of the spindle 33. The spindle 33 is rotatable and movable up and down. The yarn hook drives the yarn to be twisted to rotate around the spindle 33. The spindle 33 drives the twisted yarn tube 34 to rotate so that the twisted yarn is wound on the twisted yarn tube 34.

[0073] The yarn needs to move up and down in the axial direction of the twisted yarn tube 34 to be evenly wound on the twisted yarn tube 34. In this embodiment, the up and down movement is not completed by the program plate, but by the spindle 33. The structure is driven by a servo motor and synchronous pulley transmission to control the lifting. In this way, the relative distance between the roller transmission device 31 and the program device 32 is constant. Under the reasonable weight of the nylon yarn hook, the yarn speed of the yarn tube recovery is basically the line speed of the yarn fed by the roller transmission device 31. In this way, the twist will not fluctuate due to the change of the distance, further improving the uniformity of the twist.

[0074] In this embodiment, the upper and lower rollers 312 are clamped to the yarn bundle by pneumatic, and the lower roller 312 is driven to rotate by the motor, driving the yarn to be fed. Since there is no relative sliding between the yarn and the roller, the surface speed of the roller is the feeding speed of the yarn.

[0075] In some embodiments of the present application, the roller transmission device 31 comprises an upper roller 311 and a lower roller 312, both of which are cylindrical. The yarn to be twisted passes between the upper roller 311 and the lower roller 312. The feeding of the yarn to be twisted is controlled by rotating the upper roller 311.

[0076] When twisting the yarn:

[0077] The rotation speed of the upper roller 311 and / or the spindle 33 is adjusted according to the diameter of the twisted yarn tube 34 after winding, so that the twist of the yarn is constant.

[0078] In some embodiments of the present application, the rotation speed of the upper roller 311 and / or the spindle 33 is adjusted according to the diameter of the twisted yarn tube 34 after winding, so that the twist of the yarn is constant, comprising:

[0079] A preset value is set;

[0080] Whenever the diameter of the twisted yarn tube 34 after winding changes by a preset value, the rotational speed of the upper roller 311 and / or the spindle 33 is adjusted so that the twist of the yarn remains unchanged.

[0081] In the present embodiment, since the sum of the rotational speed of the yarn hook in the program and the recovery rotational speed of the twisted yarn tube is the rotational speed of the twisted yarn tube, the rotational speed of the twisted yarn tube is basically consistent with the rotational speed of the spindle 33, and the twist corresponds to the rotational speed of the yarn hook in the program, so that the added twist formula of the untwisted yarn entering later is as follows: T = (n2-d1n1 / d2) / (πd1n1) = n2 / πd1n1-1 / πd2, wherein n1 is the rotational speed of the upper roller 311, n2 is the rotational speed of the spindle 33, d1 is the diameter of the upper roller 311, and d2 is the diameter of the twisted yarn tube after winding. It can be seen from the formula that, under the determined rotational speed of the roller and the rotational speed of the spindle, the parameter affecting the uniformity of the twist is the diameter of the yarn tube after winding. In order to further improve the uniformity of twisting at low twist, multi-section speed control is adopted, and the trigger point of the rotational speed is the twisting length, so as to reduce the twist change caused by the twisting length. First, the forming mode of the twisted yarn tube is selected as a cylindrical shape. The diameter of the twisted yarn tube will continuously change after winding. According to the current technical means and accuracy requirements, a preset value Δ of the twisted yarn tube after winding is determined. The rotational speed of the upper roller 311 and / or the spindle 33 is adjusted once every time the diameter of the twisted yarn tube after winding changes by one Δ. Whether the diameter changes by one Δ can be determined by the length of the twisting, that is, Δ = (l n+1 -l n )d0 / l1, wherein l n is the twisting length of n sections, and d0 is the initial outer diameter of the twisted yarn tube. According to the twist formula T = n2 / πd1n1-1 / πd2, when d2 changes by one Δ, the rotational speed of the spindle 33 is changed to ensure that the twist remains unchanged, the roller speed is updated, and the twisting is continued, so as to reduce the influence of the diameter of the yarn tube after winding and further improve the uniformity of the twisting at low twist.

[0082] It should be noted that, in order to improve the uniformity of the twist, the rotational speed of the roller and / or the rotational speed of the spindle 33 can be adjusted according to the change of the diameter of the twisted yarn tube after winding. That is, the upper roller 311 can be adjusted alone, the spindle 33 can be adjusted alone, and the upper roller 311 and the spindle 33 can be adjusted simultaneously. Preferably, the upper roller 311 and the spindle 33 are adjusted simultaneously, because according to the set value of the twist, there is a ratio between the rotational speed of the upper roller 311 and the rotational speed of the spindle 33, and therefore, in order to keep the ratio unchanged, the rotational speed of the upper roller 311 and the rotational speed of the spindle 33 are preferably adjusted simultaneously.

[0083] In some embodiments of the present application, the change of the diameter of the twisted yarn tube 34 after winding is determined according to the length of the twisted yarn to be fed and the diameter of the twisted yarn tube 34.

[0084] In the embodiment, the diameter of the twisted yarn tube 34 after winding is difficult to measure in the twisting process, so the activity can be calculated by collecting the feeding length and the diameter of the twisted yarn tube 34.

[0085] In some embodiments of the application, there is a wrap angle between the pulley 21 and the yarn to be twisted.

[0086] In the embodiment, there is a wrap angle between the pulley 21 and the yarn, and the friction between the yarn and the pulley 21 is rolling friction, which further reduces the damage to the yarn.

[0087] In some embodiments of the application, a speed sensor 313 is further included, and the speed sensor 313 is used to test the feeding speed of the yarn to be twisted.

[0088] In the embodiment, the speed sensor 313 can be arranged on the lower roller 312.

[0089] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A bundle twisting apparatus characterized by, The device comprises an unwinding device (1), a guide device (2) and a twisting device (3); The unwinding device (1) is in a column shape, and an unwinding bobbin (11) of a yarn to be twisted is sleeved on the unwinding device (1); the guide device (2) comprises at least one pulley (21), the yarn to be twisted is adjusted in direction by the pulley (21) and then enters the twisting device (3) to be twisted; the axis of the unwinding device (1) is parallel to the axial direction of the pulley (21), so that the yarn to be twisted is tangent to the unwinding bobbin (11) and the pulley (21); The unwinding device (1) is connected with the rotating shaft of a constant tension motor, and the constant tension motor is used to make the tension of the yarn to be twisted constant; The constant tension motor makes the tension of the yarn to be twisted constant by the following way: The mapping relationship between the torque of the constant tension motor and external damping is calibrated; A constant damping is determined according to a preset constant tension; A variable damping is calculated according to the weight loss of the yarn to be twisted on the unwinding bobbin (11); The constant damping is corrected according to the variable damping to obtain a corrected damping; The torque of the constant tension motor is adjusted according to the corrected damping, so that the external damping is the corrected damping to make the tension of the yarn to be twisted constant; The weight loss is determined by the size of the yarn, the unwinding speed and the unwinding time; The twisting device (3) comprises a roller transmission device (31), a program device (32) and a spindle (33); The roller transmission device (31) is used to receive the yarn to be twisted introduced by the pulley (21) and control the speed of the yarn to be twisted fed to the program device (32); the program device (32) is in a ring shape and is provided with a yarn hook; the yarn to be twisted fed by the roller transmission device (31) passes through the yarn hook and is wound on a twisted yarn bobbin (34) on the spindle (33); the spindle (33) is arranged at the center of the program device (32); the twisted yarn bobbin (34) is arranged vertically at the center of the spindle (33); the spindle (33) is rotatable and movable up and down; the yarn hook drives the yarn to be twisted to rotate around the spindle (33) to twist; the spindle (33) drives the twisted yarn bobbin (34) to rotate to wind the twisted yarn on the twisted yarn bobbin (34); The roller transmission device (31) comprises an upper roller (311) and a lower roller (312) which are both in a column shape; the yarn to be twisted passes between the upper roller (311) and the lower roller (312); the feeding of the yarn to be twisted is controlled by rotating the upper roller (311); When the yarn is twisted: The rotating speed of the upper roller (311) and / or the spindle (33) is adjusted according to the diameter of the twisted yarn bobbin (34) after winding, so that the twist of the yarn is unchanged; wherein the sum of the rotating speed of the yarn hook on the program and the recovery rotating speed of the twisted yarn bobbin is the rotating speed of the twisted yarn bobbin. The twist of the yarn is unchanged when the rotation speed of the upper roller (311) and / or the spindle (33) is adjusted according to the diameter of the twisted yarn tube (34) after winding. A change preset value is set. The rotation speed of the upper roller (311) and / or the spindle (33) is adjusted every time the diameter of the twisted yarn tube (34) after winding changes by the change preset value, so that the twist of the yarn is unchanged. The change of the diameter of the twisted yarn tube (34) after winding is determined according to the length of the yarn to be twisted and the diameter of the twisted yarn tube (34).

2. A bundle twisting apparatus according to claim 1, characterised in that, There is a wrap angle between the pulley (21) and the yarn to be twisted.

3. A bundle twisting apparatus according to any one of claims 1-2, characterized in that, A speed sensor (313) is further included for testing the feeding speed of the yarn to be twisted.

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