A method for oiling spandex spinning

Abstract

This invention relates to the field of spandex spinning production technology, specifically to a method for oiling spandex spinning, comprising the following: setting an oiling roller: the oiling roller used for oiling spandex spinning is set as a frequency conversion oiling roller with adjustable speed; setting a segmented oiling strategy for spandex spinning: the winding process after spandex spinning is divided into multiple working stages according to the winding progress, and the speed of the oiling roller is set to decrease sequentially from the first working stage at the beginning of winding to the last working stage at the end of winding. This invention can overcome the shortcomings of the prior art, prevent the spandex fibers from slipping and falling off the outer layer and collapsing during yarn cake winding, and at the same time prevent the spandex fibers from sticking and breaking at the bottom layer during unwinding, thereby improving the reliability of winding and unwinding operations.

Description

Technical Field

[0001] This invention relates to the field of spandex spinning production technology, and specifically to a method for oiling spandex spinning. Background Technology

[0002] Spandex, also known as multi-block polyurethane fiber, is an elastic fiber with strong elasticity, an elongation of up to 500%, and the ability to return to its original shape. It is widely used in various sectors of the apparel industry. With the continuous growth of domestic production of spandex and its products, higher demands are being placed on its production and processing technology. Currently, spandex production mainly uses dry spinning. After spinning, the spandex fibers need to be wound onto paper tubes using a winding machine to form hollow cylindrical yarn cakes. These yarn cakes then require further unwinding for post-processing.

[0003] To prevent the spandex fibers from sticking together during subsequent unwinding of the yarn cake formed after winding, to ensure smooth unwinding during use, and to meet the subsequent processing requirements for properties such as lubricity, isolation, formability, and antistatic properties, spandex fibers usually need to be oiled before winding.

[0004] Currently, spandex fibers are uniformly oiled using a constant-speed rotating oiling roller. However, this method has drawbacks. Because spandex fibers require a certain winding tension during winding, the stress increases towards the bottom layer of the yarn package. This leads to inconsistent stress release during subsequent unwinding, with stress release becoming increasingly difficult towards the bottom layer. Consequently, the unwinding tension at the bottom layer is significantly greater than that in the middle and outer layers, resulting in issues such as yarn sticking and breakage during unwinding.

[0005] In existing technologies, to ensure smooth unwinding of the bottom layer and solve the problem of high unwinding tension, the overall oiling rate of the yarn roll is generally increased during production. However, increasing the overall oiling rate increases the production cost of the product, and the unwinding tension of the outer layer of the yarn roll will also decrease further. This can lead to issues such as slippage and fraying of the outer layer and edge collapse during yarn roll forming, and can also result in "track yarn" breakage during subsequent use.

[0006] It is difficult to find a balance between ensuring smooth unwinding of the fiber bottom layer and preventing excessive slippage of the surface layer when adjusting the above production process. The process of experimentation and exploration is lengthy, wasteful, and also affects customers' acceptance of product quality. Summary of the Invention

[0007] To address the aforementioned problems, this invention proposes a method for oiling spandex fibers during spinning. This method aims to overcome the shortcomings of existing technologies, preventing the spandex fibers from slipping and falling off the outer layer during yarn winding, and simultaneously preventing the spandex fibers from sticking and breaking off at the bottom layer during unwinding, thereby improving the reliability of winding and unwinding operations. The specific technical solution is as follows:

[0008] A method for oiling spandex spinning includes the following:

[0009] Set the oil supply roller: Set the oil supply roller used for oiling spandex spinning to a variable frequency oil supply roller with adjustable speed;

[0010] Set up a segmented oiling strategy for spandex spinning: Divide the winding process after spandex spinning into multiple working stages according to the winding progress, and set the speed of the oiling roller to decrease sequentially from the first working stage at the beginning of winding to the last working stage at the end of winding.

[0011] Preferably, the winding process after the spandex spinning is divided into three working stages: stage one, stage two, and stage three. Stage one is the bottom layer winding stage of the yarn cake, stage two is the middle layer winding stage of the yarn cake, and stage three is the outer layer winding stage of the yarn cake.

[0012] Specifically, the variable frequency oiling roller is a variable frequency oiling roller driven by a variable frequency motor. By designing a frequency segmented variable frequency control program for the variable frequency motor, the total time is allocated based on the overall winding and forming time of the yarn cake. The oiling of the bottom, middle and outer layers of the yarn cake is controlled in stages to achieve different oil content of the yarn cake at different forming stages.

[0013] In this invention, the segmented frequency control time and the corresponding frequency of the variable frequency motor in the frequency segmented frequency control program of the variable frequency motor can be manually set according to the winding process requirements.

[0014] By comparing data from multiple unwinding tension tests, the appropriate unwinding tension for each stage of the yarn cake—bottom, middle, and outer layers—was determined, along with the corresponding oiling rate data for the spandex fibers.

[0015] The oiling rate of the yarn cake was adjusted by changing the frequency of the variable frequency motor multiple times, and test data on the oiling rate of the yarn cake were obtained. Based on the test data on the oiling rate of the yarn cake, a curve showing the relationship between the frequency of the variable frequency motor and the oiling rate of the yarn cake was established, which is convenient for use when adjusting the oil content setting later.

[0016] In a method for oiling spandex spinning according to the present invention, a dynamic real-time oiling quantity monitor is also provided for real-time monitoring of the oiling quantity of the oiling roller; the spandex spinning oiling control system dynamically adjusts the frequency of the variable frequency motor in real time according to the oiling quantity error data of the oiling roller monitored by the dynamic real-time oiling quantity monitor, thereby accurately controlling the oiling rate.

[0017] Preferably, the dynamic real-time oil supply monitor includes a pair of fiber optic displacement sensors, which are respectively placed on both sides of the oil supply roller and the contact oil supply point of the spandex fiber. The center of the fiber optic probe of the fiber optic displacement sensor is aligned with the outer circular surface of the oil supply roller and is located on an annular band at the contact oil supply point of the oil supply roller and the spandex fiber in the axial direction.

[0018] The spandex spinning oiling control system uses a pair of fiber optic displacement sensors to detect the oil film thickness on both sides of the oiling roller, thereby obtaining the difference in oil film thickness on both sides of the oiling roller, and obtaining the amount of oil applied by the oiling roller based on the difference in oil film thickness; then, based on the amount of oil applied by the oiling roller and the rotation speed of the oiling roller, the oiling rate of the spandex fiber can be obtained.

[0019] The working principle of the fiber optic displacement sensor for measuring oil film thickness is as follows: Light emitted by a semiconductor laser is projected onto the bottom surface of the groove of the oil supply roller through a transmitting optical fiber. Part of the light reflected back from the bottom surface of the groove is received by the receiving optical fiber. The energy received by the receiving optical fiber has a certain functional relationship with the oil film thickness. By measuring the energy received by the receiving optical fiber, the thickness of the oil film can be determined. Then, the thickness difference of the oil film on both sides of the oil supply roller can be calculated. Combined with the rotational speed of the oil supply roller, the actual oil supply speed of the oil supply roller can be obtained.

[0020] Preferably, the outer circumference of the oiling roller is provided with an annular groove for contacting the spandex fiber, and the center of the fiber optic probe of the fiber optic displacement sensor is aligned with the center of the bottom of the annular groove.

[0021] Preferably, the fiber optic displacement sensor has a custom-designed fiber optic probe, which contains several transmitting fibers and several receiving fibers. The transmitting and receiving fibers are arranged alternately in a single direction, and each transmitting and receiving fiber is accurately aligned with the annular groove on the oiling roller.

[0022] Preferably, the front end of the customized fiber optic probe is an arc-shaped end that is equidistant from the outer circle of the oiling roller.

[0023] In this invention, the upper part of the oiling roller is in contact with the spandex fiber, and the lower part of the oiling roller is immersed in the oil tank; an oiling roller immersion depth control device is also provided for controlling the immersion depth of the oiling roller in the oil tank, and the spandex spinning oiling control system precisely controls the immersion depth of the oiling roller in the oil tank through the oiling roller immersion depth control device.

[0024] On the one hand, the immersion depth of the oil supply roller can be precisely adjusted by the oil supply roller immersion depth control device, thereby precisely controlling the amount of oil supplied by the oil supply roller.

[0025] On the other hand, by controlling the immersion depth of the oil supply roller, the gradual consumption of oil in the oil tank can be avoided, which would cause changes in the immersion depth of the oil supply roller and affect the precise control of the amount of oil supplied to the oil supply roller.

[0026] Preferably, the oil roller immersion depth control device includes an oil level measuring probe and an oil tank lifter. The oil level measuring probe is fixedly installed above the oil tank, and the oil tank is fixedly installed on the oil tank lifter.

[0027] Preferably, the oil tank lifting device includes a base, several guide columns erected vertically on the bottom of the outer side of the oil tank, and several guide holes disposed on the base and slidably engaged with the guide columns. The oil tank is moved vertically on the base via the guide columns, and a servo electric push rod is connected between the oil tank and the base.

[0028] During operation, the spandex spinning oiling control system dynamically adjusts the vertical position of the oil tank via a servo electric push rod based on the immersion depth of the oil supply roller in the oil tank measured by the oil level measuring probe, thereby ensuring that the immersion depth of the oil supply roller in the oil tank reaches the set value.

[0029] The beneficial effects of this invention are:

[0030] First, the present invention provides a method for oiling spandex spinning. By setting the oiling roller to a frequency conversion oiling roller and setting a segmented oiling strategy for spandex spinning, the method reasonably solves the problems of bottom unwinding adhesion and breakage of the yarn cake without increasing the overall oiling rate of the yarn roll. Furthermore, while ensuring normal unwinding of the bottom layer of the yarn roll, it does not affect the state of the surface fibers of the yarn cake, thereby reducing the number of products downgraded due to abnormal fiber oiling and oil content.

[0031] Secondly, the method for oiling spandex spinning of the present invention adopts a segmented oiling strategy for spandex spinning, which also reduces the overall amount of oil used in the yarn cake and lowers production costs.

[0032] Third, the spandex spinning oiling method of the present invention can further improve the control accuracy of the oiling rate of the yarn cake at each stage by setting a dynamic real-time oiling quantity monitor. Furthermore, the dynamic real-time oiling quantity monitor has advantages such as high sensitivity, wide bandwidth, large measurement range, strong anti-interference ability, resistance to corrosion, and stable and reliable operation even in flammable and explosive environments, realizing online measurement and automatic control of the oiling quantity.

[0033] Fourth, the method for oiling spandex spinning of the present invention includes an oiling roller immersion depth control device, which can prevent the oil in the oil tank from gradually being consumed, causing changes in the immersion depth of the oiling roller and affecting the precise control of the oiling amount on the oiling roller. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of an oiling method for spandex spinning according to the present invention;

[0035] Figure 2 This is a structural diagram showing how the silk cake is divided into bottom, middle and outer layers;

[0036] Figure 3 This is a schematic diagram of the structure of the real-time dynamic oil level monitor;

[0037] Figure 4 This is a schematic diagram of the oil roller immersion depth control device;

[0038] Figure 5 This is a frontal view of the front end face of a custom-designed fiber optic probe.

[0039] In the diagram: 1. Oil supply roller, 2. Silk cake, 3. Bottom layer, 4. Middle layer, 5. Outer layer, 6. Paper tube, 7. Spandex fiber, 8. Dynamic real-time oil supply monitor, 9. Fiber optic displacement sensor, 10. Fiber optic probe, 11. Transmitting fiber, 12. Receiving fiber, 13. Arc-shaped end, 14. Oil tank, 15. Oil supply roller immersion depth control device, 16. Oil level ranging probe, 17. Oil tank lifter, 18. Base, 19. Guide column, 20. Servo electric push rod. Detailed Implementation

[0040] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0041] like Figures 1 to 5 The following is an embodiment of an oiling method for spandex spinning according to the present invention, which includes the following:

[0042] Set the oil supply roller: Set the oil supply roller 1 used for oiling spandex spinning to a variable frequency oil supply roller with adjustable speed;

[0043] Set up a segmented oiling strategy for spandex spinning: Divide the winding process after spandex spinning into multiple working stages according to the winding progress, and set the rotation speed of the oiling roller 1 to decrease sequentially from the first working stage at the beginning of winding to the last working stage at the end of winding.

[0044] Preferably, the winding process after the spandex spinning is divided into three working stages: stage one, stage two, and stage three. Stage one is the bottom layer winding stage of the yarn cake, stage two is the middle layer winding stage of the yarn cake, and stage three is the outer layer winding stage of the yarn cake.

[0045] Specifically, the variable frequency oiling roller 1 is a variable frequency oiling roller driven by a variable frequency motor. By designing a frequency segmented variable frequency control program for the variable frequency motor, the total time is allocated based on the overall winding and forming time of the yarn cake 2. The oiling status of the bottom layer 3, middle layer 4 and outer layer 5 of the yarn cake 2 is controlled in stages to achieve different oil content of the yarn cake 2 at different forming stages.

[0046] In this embodiment, in the frequency segmented frequency conversion control program of the variable frequency motor, the segmented control time and the corresponding frequency of the variable frequency motor can be manually set according to the winding process requirements.

[0047] By comparing data from multiple unwinding tension tests, the appropriate unwinding tension for each stage of the yarn cake (bottom, middle, and outer layers) was determined, along with the corresponding oiling rate data for spandex fiber 7.

[0048] The oiling rate of the silk cake 2 was adjusted by changing the frequency of the variable frequency motor multiple times, and test data of the oiling rate of the silk cake 2 were obtained. Based on the test data of the oiling rate of the silk cake 2, a curve showing the relationship between the frequency of the variable frequency motor and the oiling rate of the silk cake 2 was established, which is convenient for use when adjusting the oil content setting later.

[0049] In this embodiment of the spandex spinning oiling method, a real-time oiling quantity dynamic monitor 9 is also provided for real-time monitoring of the oiling quantity of the oiling roller 1; the spandex spinning oiling control system dynamically adjusts the frequency of the variable frequency motor in real time according to the oiling quantity error data of the oiling roller 1 monitored by the real-time oiling quantity dynamic monitor 8, thereby accurately controlling the oiling rate.

[0050] Preferably, the dynamic real-time oil supply monitor 8 includes a pair of fiber optic displacement sensors 9, and the pair of fiber optic displacement sensors 9 are respectively placed on both sides of the oil supply roller 1 and the oil supply point where the spandex fiber 7 contacts the oil supply point. The center of the fiber optic probe 10 of the fiber optic displacement sensor 9 is aligned with the outer circular surface of the oil supply roller 1 and is located on an annular band in the axial direction at the oil supply point where the oil supply roller 1 contacts the spandex fiber 7.

[0051] The spandex spinning oiling control system uses a pair of fiber optic displacement sensors 9 to detect the oil film thickness on both sides of the oiling roller 1, thereby obtaining the difference in oil film thickness on both sides of the oiling roller 1, and obtaining the amount of oil applied by the oiling roller 1 based on the difference in oil film thickness; then, based on the amount of oil applied by the oiling roller 1 and the rotation speed of the oiling roller 1, the oiling rate of the spandex fiber can be obtained.

[0052] The working principle of the fiber optic displacement sensor 9 for measuring oil film thickness is as follows: light emitted by a semiconductor laser is projected onto the bottom surface of the groove of the oil supply roller 1 through the transmitting fiber 11. Part of the light reflected back from the bottom surface of the groove is received by the receiving fiber optic cable. The energy received by the receiving fiber optic cable has a certain functional relationship with the oil film thickness. By measuring the energy received by the receiving fiber optic cable, the thickness of the oil film can be determined. Then, the thickness difference of the oil film on both sides of the oil supply roller 1 can be calculated. Combined with the rotational speed of the oil supply roller 1, the actual oil supply speed of the oil supply roller 1 can be obtained.

[0053] Preferably, the outer circumference of the oiling roller 1 is provided with an annular groove for contacting the spandex fiber 7, and the center of the fiber optic probe 10 of the fiber optic displacement sensor 9 is aligned with the center of the bottom of the annular groove.

[0054] Preferably, the fiber optic probe 10 of the fiber optic displacement sensor 9 is a customized fiber optic probe, which is provided with a plurality of transmitting fibers 11 and a plurality of receiving fibers 12, and the transmitting fibers 11 and receiving fibers 12 are arranged alternately in a single direction, so that each transmitting fiber 11 and receiving fiber 12 is accurately aligned with the annular groove on the oiling roller 1.

[0055] Preferably, the front end of the customized fiber optic probe 10 is an arc-shaped end 13 that is equidistant from the outer circle of the oiling roller 1.

[0056] In this embodiment, the upper part of the oiling roller 1 is in contact with the spandex fiber 7, and the lower part of the oiling roller 1 is immersed in the oil tank 14; an oiling roller immersion depth control device 15 is also provided for controlling the immersion depth of the oiling roller 1 in the oil tank 14, and the spandex spinning oiling control system precisely controls the immersion depth of the oiling roller 1 in the oil tank 14 through the oiling roller immersion depth control device 15.

[0057] On the one hand, the immersion depth of the oil supply roller 1 can be precisely adjusted by the oil supply roller immersion depth control device 15, thereby precisely controlling the amount of oil supplied by the oil supply roller 1.

[0058] On the other hand, by controlling the oil supply roller immersion depth control device 15, the gradual consumption of oil in the oil tank 14 can prevent changes in the immersion depth of the oil supply roller 1 from affecting the precise control of the oil supply roller 1's oil quantity.

[0059] Preferably, the oil roller immersion depth control device 15 includes an oil level measuring probe 16 and an oil tank lifter 17. The oil level measuring probe 16 is fixedly installed above the oil tank 14, and the oil tank 14 is fixedly installed on the oil tank lifter 17.

[0060] Preferably, the oil tank lifting device 17 includes a base 18, a plurality of guide columns 19 vertically arranged on the bottom of the outer side of the oil tank 14, and a plurality of guide holes arranged on the base 18 and slidably engaged with the guide columns 19. The oil tank 14 is moved vertically on the base 18 via the guide columns 19, and a servo electric push rod 20 is connected between the oil tank 14 and the base 18.

[0061] During operation, the spandex spinning oiling control system dynamically adjusts the vertical position of the oil tank 14 via the servo electric push rod 20 based on the immersion depth of the oil supply roller 1 in the oil tank 14 measured by the oil level measuring probe 16, so that the immersion depth of the oil supply roller 1 in the oil tank 14 reaches the set value.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for oiling spandex spinning, characterized in that, Includes the following: Set the oil supply roller: Set the oil supply roller used for oiling spandex spinning to a variable frequency oil supply roller with adjustable speed; Set up a segmented oiling strategy for spandex spinning: Divide the winding process after spandex spinning into multiple working stages according to the winding progress, and set the speed of the oiling roller to decrease sequentially from the first working stage at the beginning of winding to the last working stage at the end of winding. A dynamic real-time oiling monitor is also provided for real-time monitoring of the oiling amount applied to the oiling roller. The dynamic real-time oiling monitor includes a pair of fiber optic displacement sensors, which are respectively placed on both sides of the oiling point where the oiling roller contacts the spandex fiber. The center of the fiber optic probe of the fiber optic displacement sensor is aligned with the outer circumferential surface of the oiling roller and is located on an annular band at the oiling point where the oiling roller contacts the spandex fiber. The spandex spinning oiling control system uses the dynamic real-time oiling monitor to detect the oil film thickness on both sides of the oiling roller through the pair of fiber optic displacement sensors, thereby obtaining the difference in oil film thickness on both sides of the oiling roller, monitoring the oiling amount error data of the oiling roller, and dynamically adjusting the frequency of the variable frequency motor in real time to change the rotation speed of the oiling roller, thereby accurately controlling the oiling rate. The winding process after the spandex spinning is divided into three working stages: stage one, stage two, and stage three. Stage one is the bottom layer winding stage of the yarn cake, stage two is the middle layer winding stage of the yarn cake, and stage three is the outer layer winding stage of the yarn cake. The variable frequency oiling roller is a variable frequency oiling roller driven by a variable frequency motor. By designing a frequency segmented variable frequency control program for the variable frequency motor, the total time is allocated based on the overall winding and forming time of the yarn cake. The oiling of the bottom, middle, and outer layers of the yarn cake is controlled in stages to achieve different oil content of the yarn cake at different forming stages.

2. The method for oiling spandex spinning according to claim 1, characterized in that, In the frequency segmented frequency conversion control program of the variable frequency motor, the segmented control time and the corresponding frequency of the variable frequency motor can be manually set according to the winding process requirements.

3. The method for oiling spandex spinning according to claim 1, characterized in that, By comparing data from multiple unwinding tension tests, the appropriate unwinding tension for each stage of the yarn cake—bottom, middle, and outer layers—was determined, along with the corresponding oiling rate data for the spandex fibers.

4. The method for oiling spandex spinning according to claim 1, characterized in that, The oiling rate of the yarn cake was adjusted by changing the frequency of the variable frequency motor multiple times, and test data on the oiling rate of the yarn cake were obtained. Based on the test data on the oiling rate of the yarn cake, a curve showing the relationship between the frequency of the variable frequency motor and the oiling rate of the yarn cake was established, which is convenient for use when adjusting the oil content setting later.

5. The method for oiling spandex spinning according to claim 1, characterized in that, The upper part of the oiling roller is in contact with the spandex fiber, and the lower part of the oiling roller is immersed in the oil tank. An oiling roller immersion depth control device is also provided to control the immersion depth of the oiling roller in the oil tank. The spandex spinning oiling control system precisely controls the immersion depth of the oiling roller in the oil tank through this device. The oiling roller immersion depth control device includes an oil level measuring probe and an oil tank lifter. The oil level measuring probe is fixedly installed above the oil tank, and the oil tank is fixedly installed on the oil tank lifter. During operation, the spandex spinning oiling control system dynamically adjusts the vertical position of the oil tank through a servo electric push rod based on the immersion depth of the oiling roller measured by the oil level measuring probe, thereby ensuring that the immersion depth of the oiling roller in the oil tank reaches the set value.

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