A raw silk spinning system and a method for adjusting the positioning accuracy of its spinneret.

Abstract

The present invention relates to the field of spinning production technology, and in particular to a raw silk spinning system and a method for adjusting the positioning accuracy of a spinneret thereof, wherein in the raw silk spinning system, a spinneret unit includes a spinneret for extruding a spinning solution; a first detection unit includes a liquid level sensor for detecting the distance between the spinneret and the liquid surface of a liquid pool; a lifting unit synchronously drives the spinneret and the liquid level sensor to move in a vertical direction; and a second detection unit includes a depth gauge arranged based on the same mounting plane as the liquid level sensor, for calibrating the height error of the liquid level sensor. The method for adjusting the positioning accuracy of the spinneret of the raw silk spinning system optimizes the detection accuracy of the liquid level sensor, accurately controls the distance between the spinneret and the liquid surface of the liquid pool, lowers the spinneret to the closest possible distance to the liquid surface, and avoids the spinneret from contacting the liquid surface, thereby causing the spinneret to be scrapped; and the draft ratio of the spinning stage is controlled by the optimized liquid level sensor in conjunction with the lifting system, thereby ensuring the spinning quality.

Description

Technical Field

[0001] This invention relates to the field of spinning production technology, and in particular to a raw silk spinning system and a method for adjusting the positioning accuracy of the spinneret. Background Technology

[0002] Spinning is a process for manufacturing chemical fibers. It involves spraying a colloidal solution or melt made of polymer compounds through a nozzle through a fine hole. The colloidal solution or melt then enters a liquid pool containing chemical liquids to produce a chemical reaction, ultimately forming a filamentous finished product.

[0003] During the spinning process, the distance between the nozzle and the surface of the chemical liquid below it will affect the shape of the colloidal solution or melt when it enters the chemical liquid. Therefore, it is necessary to strictly control the distance between the nozzle and the surface of the chemical liquid during the spinning process.

[0004] Currently, the raising and lowering of the nozzle is achieved through positioning using a corresponding magnetostrictive sensor. When the nozzle is raised away from the liquid surface, the float on the sensor falls back to its initial position and is stopped by the clamp below it. When the nozzle is lowered to the working liquid level, the float on the sensor moves upward under the action of buoyancy. During the movement, there is an accumulated error, which affects the positioning accuracy. After multiple positioning operations, the up and down movement of the float can easily cause water droplets to remain on it, resulting in a change in the weight of the float and thus affecting the positioning accuracy.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] This invention provides a raw silk spinning system and a method for adjusting the positioning accuracy of the spinneret, which can effectively solve the problems in the background art.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A raw silk spinning system, comprising:

[0009] The spinning unit includes a spinneret positioned above the liquid surface of the feed tank for extruding the spinning solution;

[0010] The first detection unit includes a liquid level sensor disposed on the horizontal side of the spinneret, which is used to detect the distance between the spinneret and the liquid surface of the feed tank;

[0011] The lifting unit synchronously drives the spinneret and the liquid level sensor to move vertically;

[0012] The second detection unit includes a depth gauge set on the same mounting plane as the liquid level sensor, used to calibrate the height error of the liquid level sensor.

[0013] Furthermore, the liquid level sensor is configured as a magnetostrictive sensor, including a detection rod and a float sleeved thereon, the float being slidably connected to the detection rod;

[0014] A clamp is provided on the detection rod corresponding to the bottom of the float, and the float is slidably connected to the detection rod through a bushing provided thereon.

[0015] Furthermore, a through hole is provided radially through the float, and the bushing is disposed at the end of the through hole away from the clamp.

[0016] Furthermore, both the liquid level sensor and the depth gauge are mounted on the reference plane of the connecting seat. The connecting seat is positioned on its horizontal side corresponding to the spinneret, and its installation height is higher than the liquid outlet of the spinneret. The lifting unit drives the connecting seat to move vertically through the spinneret.

[0017] A method for adjusting the positioning accuracy of the spinneret in a raw silk spinning system, applied to the aforementioned raw silk spinning system, includes the following steps:

[0018] Adjust the initial limit position of the float ball on the liquid level sensor in the first detection unit;

[0019] The difference between the theoretical and actual values ​​measured by the liquid level sensor is measured by the second detection unit.

[0020] The detected difference is added as error compensation to the control system of the lifting unit;

[0021] The lifting unit, in conjunction with the liquid level sensor, drives the spinneret to descend to the working height for spinning operation.

[0022] Furthermore, adjusting the initial limit position of the float ball on the liquid level sensor in the first detection unit includes the following steps:

[0023] The lengths of the projected lengths of the float and its upper bushing in the liquid level sensor onto the detection rod are measured respectively, and recorded as follows: 2R and H ;

[0024] The spinneret is moved to the working height by the lifting unit, and the projected length of the portion of the float submerged below the liquid surface on the detection rod is measured. R 1 and the length of the detection rod submerged below the liquid surface. L ;

[0025] Adjust the position of the clamp on the detection rod so that the distance between the side of the clamp facing the float and the bottom end of the detection rod is [distance missing]. l 1 Specifically, it is calculated using the following formula:

[0026] L-2R-R 1 +H＜l 1 <L-2R 1 .

[0027] Furthermore, the step of measuring the difference between the theoretical and actual values ​​of the liquid level sensor through the second detection unit includes the following steps:

[0028] Install the depth gauge on the same reference plane as the liquid level sensor;

[0029] The spinneret is driven to the working height by the lifting unit, at which point the theoretical value of the distance between the reference plane and the liquid surface is a;

[0030] Adjust the electronic depth gauge to distance a and observe whether it is in contact with the liquid surface;

[0031] If the electronic depth gauge is submerged in water, then the electronic depth gauge is adjusted to a distance b(b). <a);

[0032] If, upon further observation, the electronic depth gauge is not submerged in water, then the electronic depth gauge is adjusted to a distance c(b). <c);

[0033] The electronic depth gauge adjustment steps are repeated using a binary method, measuring N times until the electronic depth gauge contacts the liquid surface, and at this time the electronic depth gauge is adjusted to a distance n.

[0034] The difference between the actual distance and the theoretical distance of the liquid level sensor is recorded as na, and added to the control system of the lifting unit.

[0035] Furthermore, the depth gauge is selected as an electronic depth gauge with a measurement accuracy at the micrometer level.

[0036] Furthermore, when the lifting unit drives the spinneret to descend to the working height, the float reaches the automatic calibration liquid surface, remains stationary for a preset time, and then starts automatic calibration after the liquid surface stabilizes.

[0037] Furthermore, the preset time is set to ten seconds.

[0038] The beneficial effects of this invention are as follows:

[0039] This invention optimizes the detection accuracy of the liquid level sensor to precisely control the distance between the spinneret and the liquid surface in the feed tank, allowing the spinneret to descend as close to the liquid surface as possible while avoiding contact with the liquid surface that could damage the spinneret. The optimized liquid level sensor, in conjunction with the lifting system, controls the draw ratio during the spinning stage, thereby ensuring spinning quality. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of the raw silk spinning system in this invention;

[0042] Figure 2 This is a schematic diagram showing the lowest installation position of the clamp in the liquid level sensor of the present invention;

[0043] Figure 3 This is a schematic diagram showing the highest installation position of the clamp in the liquid level sensor of the present invention;

[0044] Figure 4 This is a schematic diagram illustrating the principle of multiple depth gauge measurements in this invention.

[0045] Reference numerals: 1. Spinneret; 2. Liquid level sensor; 21. Detection rod; 22. Float; 221. Through hole; 222. Bushing; 23. Clamp; 3. Connecting seat; 4. Depth gauge. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0047] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0049] This invention discloses a raw silk spinning system and a method for adjusting the positioning accuracy of the spinneret. By optimizing the detection accuracy of the liquid level sensor, the distance between the spinneret and the liquid surface of the feed tank is precisely controlled, so that the spinneret descends to be as close to the liquid surface as possible, and the spinneret is prevented from contacting the liquid surface and causing it to be scrapped. The optimized liquid level sensor, in conjunction with the lifting system, controls the draw ratio during the spinning stage, thereby ensuring the spinning quality.

[0050] In this embodiment, if Figure 1 The illustrated raw filament spinning system includes a spinneret unit, comprising a spinneret 1 positioned above the liquid surface of a feed tank for extruding spinning solution; a first detection unit, comprising a liquid level sensor 2 positioned on the horizontal side of the spinneret 1 for detecting the distance between the spinneret 1 and the liquid surface of the feed tank; a lifting unit, synchronously driving the spinneret 1 and the liquid level sensor 2 to move vertically; and a second detection unit, comprising a depth gauge 4 positioned on the same mounting plane as the liquid level sensor 2 for calibrating the height error of the liquid level sensor 2.

[0051] The liquid level sensor 2 is a magnetostrictive sensor, including a detection rod 21 and a float 22 sleeved on it, with the float 22 slidably connected to the detection rod 21. A clamp 23 is provided on the detection rod 21 corresponding to the bottom of the float 22, and the float 22 is slidably connected to the detection rod 21 through a bushing 222. A through hole 221 is provided radially through the float 22, and the bushing 222 is located at the end of the through hole 221 away from the clamp 23.

[0052] The hollow structure of the float 22 facilitates its movement up and down on the detection rod 21. The rotation of the float 22 in the water is restricted by the bushing 222 set at the upper end of the float 22, ensuring the monitoring stability of the liquid level sensor 2. When the lifting unit lifts the liquid level sensor 2 out of the water surface, the float 22 on the liquid level sensor 2 is in the limiting position of the lower clamp 23, preventing the float 22 from falling into the liquid pool.

[0053] Furthermore, the liquid level sensor 2 and the depth gauge 4 are both installed on the reference plane of the connecting seat 3. The connecting seat 3 is set on its horizontal side corresponding to the spinneret 1, and its installation height is higher than the liquid outlet of the spinneret 1. The lifting unit drives the connecting seat 3 to move vertically through the spinneret 1.

[0054] In this invention, the level sensor 2, which works in conjunction with the lifting unit to control the movement of the spinneret 1, is a magnetostrictive sensor. During use, both its detection rod 21 and float 22 extend into the liquid surface of the feed tank. The magnetostrictive sensor can accurately detect the absolute position of the moving float 22 through internal non-contact measurement and control technology. When the lifting unit drives the level sensor 2 to gradually extend into the liquid surface of the feed tank, the float 22, which is sleeved on the detection rod 21, is subjected to buoyancy and begins to move upward. It continuously moves upward from the initial limit position until the spinneret 1 descends to the working liquid surface. The entire displacement process of the float 22 has cumulative errors, which will affect the positioning accuracy of the spinneret 1.

[0055] This invention addresses the existing accuracy issues of the liquid level sensor 2 by proposing a method for adjusting the positioning accuracy of the spinneret 1 in a raw silk spinning system. Applied to the aforementioned raw silk spinning system, the method includes the following steps:

[0056] Adjust the initial limit position of the float ball 22 on the liquid level sensor 2 in the first detection unit; measure the difference between the theoretical and actual values ​​of the liquid level sensor 2 through the second detection unit; add the detected difference as error compensation to the control system of the lifting unit; the lifting unit, in conjunction with the liquid level sensor 2, drives the spinneret 1 to descend to the working height for spinning operation.

[0057] In this embodiment, by adjusting the initial limiting position of the float on the detection rod, the moving distance of the float in the displacement sensor is reduced, the accumulated error during the movement is reduced, thereby improving the positioning accuracy of the spinneret.

[0058] For details, see Figure 2 and Figure 3 As shown, adjusting the initial limit position of the float ball on the liquid level sensor in the first detection unit includes the following steps:

[0059] Measure the lengths of the projections of the float and its upper sleeve onto the detection rod in the liquid level sensor, and record them as follows: 2R and H The spinneret is moved to the working height by a lifting unit, and the projected length of the part of the float submerged below the liquid surface on the detection rod is measured. R 1 And the length of the detection rod submerged below the liquid surface. L Adjust the position of the clamp on the detection rod so that the distance between the side of the clamp facing the float and the bottom of the detection rod is [distance missing]. l 1 Specifically, it is calculated using the following formula: L-2R-R 1 +H＜l 1 <L-2R 1 .

[0060] Among them, when the floating ball floats on the water surface, the height of the underwater part is R1 and the height of the whole floating ball is 2R The height of the floating ball bushing is H The distance that the floating ball moves from the initial position to the working liquid level is set to S To ensure that the bushing does not get wet, the moving distance of the floating ball should not exceed the difference between the height of the floating ball and the height of the bushing. As shown in Figure 2 and Figure 3 The reasonable moving distance range is R 1 <S<2R- H . This can ensure that the bushing does not get wet and thus improve the positioning accuracy of the spinneret.

[0061] Move the position of the hoop upward to raise the initial limit position of the floating ball and shorten the moving distance to reduce the cumulative error. The floating ball adopts a hollow structure and moves up and down the detection rod of the liquid level sensor. The fixed bushing at the upper end of the floating ball is used to limit the rotation of the floating ball in the water. During the working process of the liquid level sensor, when the floating ball floats on the liquid surface, the height of its immersion below the liquid surface is R 1 . The detection rod will also be immersed in the water, resulting in some water remaining on the detection rod. When the position of the hoop is too low, there will be a situation where residual water droplets adhere to the bushing when the floating ball moves downward, causing a change in the weight of the floating ball and affecting the positioning accuracy. Therefore, it is necessary to prevent the upper bushing of the floating ball from getting wet.

[0062] In this embodiment, as shown in Figure 4 , measure the difference between the theoretical measurement value and the actual value of the liquid level sensor through the second detection unit, including the following steps:

[0063] Install the depth gauge on the same reference plane as the liquid level sensor; drive the spinneret to the working height through the lifting unit. At this time, the theoretical value of the distance between the reference plane and the liquid surface is a; adjust the electronic depth gauge to a distance of a and observe whether it contacts the liquid surface; if the electronic depth gauge is immersed in the water, adjust the electronic depth gauge to a distance of b (b < a); observe again. If the electronic depth gauge is not immersed in the water, adjust the electronic depth gauge to a distance of c (b < c); use the bisection method to cycle the adjustment steps of the electronic depth gauge and measure N times until the electronic depth gauge contacts the liquid surface, and at this time, the electronic depth gauge is adjusted to a distance of n; record the difference between the actual distance and the theoretical distance of the liquid level sensor as n - a and add it to the control system of the lifting unit to improve the positioning accuracy of the spinneret. Among them, the depth gauge selects an electronic depth gauge with a measurement accuracy of wire level.

[0064] When the lifting unit drives the spinneret to descend to the working height, at this time, the floating ball reaches the automatic calibration liquid level, maintains static and stays for a preset time, and then starts automatic calibration after the liquid surface is stable; among them, the preset time is set to ten seconds.

[0065] During the descent of the spinneret driven by the lifting unit, as the liquid level sensor probe gradually extends into the liquid surface, the float begins to contact the solution, causing surface oscillations. When the float reaches the automatic calibration liquid level, the current liquid level position is recorded. If the liquid level fluctuation is large at this moment, it will cause excessive calibration errors, resulting in poor spinneret positioning accuracy. Therefore, during program processing, when the float reaches the automatic calibration liquid level, it remains stationary for ten seconds until the liquid level stabilizes before resuming automatic calibration, thereby improving the spinneret positioning accuracy.

[0066] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for adjusting the positioning accuracy of the spinneret in a raw silk spinning system, characterized in that, This is applied to a raw silk spinning system, which includes: The spinning unit includes a spinneret (1) disposed above the liquid surface of the feed tank for extruding the spinning solution; The first detection unit includes a liquid level sensor (2) disposed on the horizontal side of the spinneret (1) for detecting the distance between the spinneret (1) and the liquid surface of the feed tank; The lifting unit synchronously drives the spinneret (1) and the liquid level sensor (2) to move in the vertical direction; The second detection unit includes a depth gauge (4) set on the same mounting plane as the liquid level sensor (2) for calibrating the height error of the liquid level sensor (2); The liquid level sensor (2) is configured as a magnetostrictive sensor, including a detection rod (21) and a float (22) sleeved thereon, wherein the float (22) is slidably connected to the detection rod (21); A clamp (23) is provided on the detection rod (21) corresponding to the bottom of the float (22), and the float (22) is slidably connected to the detection rod (21) through a bushing (222) provided thereon; A through hole (221) is provided in the float (22) along its radial direction, and the bushing (222) is provided at the end of the through hole (221) away from the clamp (23); The method for adjusting the positioning accuracy of the spinneret includes the following steps: Adjust the initial limit position of the float ball on the liquid level sensor in the first detection unit; The difference between the theoretical and actual values ​​measured by the liquid level sensor is measured by the second detection unit. The detected difference is added as error compensation to the control system of the lifting unit; The lifting unit, in conjunction with the liquid level sensor, drives the spinneret to descend to the working height for spinning operation; Adjusting the initial limit position of the float ball on the liquid level sensor in the first detection unit includes the following steps: The lengths of the projected lengths of the float and its upper bushing in the liquid level sensor onto the detection rod are measured respectively, and recorded as follows: 2R and H ; The spinneret is moved to the working height by the lifting unit, and the projected length of the portion of the float submerged below the liquid surface on the detection rod is measured. R 1 and the length of the detection rod submerged below the liquid surface. L ; If the upper bushing of the float is not wetted, set the distance the float moves from its initial position to the working fluid surface to be... S ,satisfy: R 1 < S < 2R- H ; Adjust the position of the clamp on the detection rod so that the distance between the side of the clamp facing the float and the bottom end of the detection rod is [distance missing]. l 1 Specifically, it is calculated using the following formula: L-2R-R 1 +H＜l 1 <L-2R 1 。 2. The method for adjusting the positioning accuracy of the spinneret in a raw silk spinning system according to claim 1, characterized in that, The liquid level sensor (2) and the depth gauge (4) are both installed on the reference plane of the connecting seat (3). The connecting seat (3) is set on its horizontal side corresponding to the spinneret (1), and its installation height is higher than the liquid outlet of the spinneret (1). The lifting unit drives the connecting seat (3) to move vertically through the spinneret (1).

3. The method for adjusting the positioning accuracy of the spinneret in a raw silk spinning system according to claim 1, characterized in that, The step of measuring the difference between the theoretical and actual values ​​of the liquid level sensor through the second detection unit includes the following steps: The depth gauge is mounted on the same reference plane as the liquid level sensor; The spinneret is driven to the working height by the lifting unit, at which point the theoretical value of the distance between the reference plane and the liquid surface is a; Adjust the depth gauge to distance a and observe whether it is in contact with the liquid surface; If the depth gauge is submerged in water, then the depth gauge is adjusted to a distance b (b <a); If the depth gauge is not submerged in water upon further observation, then adjust the depth gauge to a distance c(b). <c); The depth gauge adjustment steps are repeated using a binary method, measuring N times until the depth gauge contacts the liquid surface, and at this point the depth gauge is adjusted to a distance n. The difference between the actual distance and the theoretical distance of the liquid level sensor is recorded as na, and added to the control system of the lifting unit.

4. The method for adjusting the positioning accuracy of the spinneret in a raw silk spinning system according to claim 3, characterized in that, The depth gauge selected is an electronic depth gauge with a measurement accuracy at the micrometer level.

5. The method for adjusting the positioning accuracy of the spinneret in a raw silk spinning system according to claim 1, characterized in that, When the lifting unit drives the spinneret to descend to the working height, the float reaches the automatic calibration liquid surface, remains stationary for a preset time, and then starts automatic calibration after the liquid surface stabilizes.

6. The method for adjusting the positioning accuracy of the spinneret in a raw silk spinning system according to claim 5, characterized in that, The preset time is set to ten seconds.

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