A raw silk spinning production device and its draft ratio control method

Abstract

The present invention relates to the field of spinning production technology, and in particular to a raw silk spinning production device and a draft ratio control method thereof, wherein the height position of the liquid level of the material pool is controlled by adjusting the height position of the overflow plate, and the overflow plates on multiple connecting pools are adjusted to make their heights uniform; the liquid in the liquid storage tank is pumped to each connecting pool by a water pump, the liquid level in the material pool is detected by a second liquid level sensor, and the distance between the spinneret and the liquid level in the material pool is detected by a first liquid level sensor; the spinneret on the support frame is adjusted by a servo system to keep a set distance between it and the liquid surface of the material pool; the flow direction of the liquid pump in the liquid storage tank to the material pool is controlled by a water pump, so that the liquid level in the material pool is kept at a set position. The draft ratio of the spinning and spinning stage is controlled by adjusting the distance between the spinneret and the liquid surface of the material pool; multiple connecting pools are interconnected and cooperate with the overflow plates arranged thereon to maintain the same overflow surface height of the connecting pools, ensuring that the overflow surface remains basically unchanged or fluctuates as little as possible, thereby ensuring the spinning quality.

Description

Technical Field

[0001] The invention relates to the technical field of spinning production, and in particular to a raw silk spinning production device and a draft ratio control method thereof. Background Art

[0002] Spinning is a process for manufacturing chemical fibers. The specific steps are as follows: a colloidal solution made of certain polymer compounds is melted or melted into a melt, and then the colloidal solution or melt is sprayed out through the fine holes on the nozzle, so that the colloidal solution or melt enters other liquid chemical liquid materials and produces a chemical reaction, eventually forming a filamentary finished product.

[0003] During the spinning process, the distance between the nozzle and the liquid surface of the chemical liquid below it will affect the shape of the colloidal solution or melt when it enters the chemical liquid. Therefore, the distance between the nozzle and the liquid surface of the chemical liquid needs to be strictly controlled during the spinning process. At present, a magnetostrictive sensor is used to measure the liquid level of the material pool. The float mounted on the detection rod slides along the length of the detection rod as the liquid level rises and falls, but it is easy to get stuck, which affects the regulation of the distance between the spinneret and the liquid surface and affects the quality of raw silk production. Summary of the invention

[0004] The invention provides a raw silk spinning production device and a draft ratio control method thereof, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A raw silk spinning production device comprises a material pool and a spinneret arranged above the material pool, wherein the spinneret is arranged on a support frame and is driven by a servo system to move in a vertical direction, and the bottom of the material pool is connected to a liquid storage tank through a water pump;

[0007] A first mounting seat and a second mounting seat are respectively arranged on the support frame and the side of the material pool trough, and a first liquid level sensor and a second liquid level sensor are respectively arranged on the first mounting seat and the second mounting seat;

[0008] The material pool is divided into a plurality of interconnected connecting pools by partitions, and a plurality of spinnerets are provided corresponding to the connecting pools. The material pool is connected to the liquid storage tank via a liquid inlet opened at the bottom of the connecting pool.

[0009] Furthermore, the first liquid level sensor and the second liquid level sensor are both configured as magnetostrictive sensors, and their detection rods and floats are both extended into the liquid surface of the material pool.

[0010] Furthermore, the detection rod passes through the through holes at both ends of the float along the radial direction, and a limit ring is arranged at the through hole, and the limit ring is made of PTFE material;

[0011] The inner ring of the limiting ring is arranged as a plum blossom structure, including four arc-shaped grooves evenly arranged along its circumference.

[0012] Furthermore, the partitions are evenly arranged along the length direction of the material pool, and one side of the groove edge in the length direction of the material pool is open;

[0013] An overflow plate is arranged at the opening position of the side of the material pool trough, and a plurality of overflow plates are arranged corresponding to the connecting pool.

[0014] Furthermore, the overflow plate is slidably connected to the connecting pool and can move in a vertical direction;

[0015] A water collecting trough is provided near the material pool and on one side thereof where the overflow plate is provided, and the water collecting trough is provided along the length direction of the material pool.

[0016] Furthermore, a plurality of spinneret holes are evenly distributed at the bottom of the spinneret.

[0017] A method for controlling the draft ratio of raw silk spinning production, using the raw silk spinning production device, comprises the following steps:

[0018] The height of the liquid level in the material pool is controlled by adjusting the height of the overflow plate, and the overflow plates on multiple connecting pools are adjusted to make their heights uniform;

[0019] The liquid in the liquid storage tank is pumped into each connecting pool by a water pump, the liquid level in the material pool is detected by a second liquid level sensor arranged on the second mounting seat, and the distance between the spinneret and the liquid level in the material pool is detected by a first liquid level sensor on the first mounting seat;

[0020] The spinneret on the support frame is adjusted by the servo system so that the spinneret is kept at a set distance from the liquid surface of the material pool;

[0021] The flow direction of the liquid in the liquid storage tank to the material pool is controlled by a water pump, so that the liquid level in the material pool is maintained at a set position.

[0022] Furthermore, the monitoring values ​​of the first liquid level sensor and the second liquid level sensor are fed back to the control center and the vertical height of the spinneret is adjusted through the servo system, which specifically includes the following steps:

[0023] The height between the liquid level and the liquid surface is detected by the first liquid level sensor and the second liquid level sensor, and recorded as H and h respectively;

[0024] The distance b between the current spinneret and the liquid surface of the material pool is calculated by the following formula:

[0025] b=h+△ha;

[0026] Wherein, △h=Hh, a represents the distance between the installation position of the first liquid level sensor and the spinneret, and the current position s of the servo system is recorded at the same time;

[0027] According to the distance between the spinneret and the liquid surface of the material pool set according to the process requirements, the adjustment distance s1 of the servo system is calculated using the following formula:

[0028] s1=b-b1+s;

[0029] Among them, b1 represents the distance between the spinneret and the liquid surface of the material pool that needs to be set in the process.

[0030] Furthermore, in the process of the second liquid level sensor detecting the liquid level height of the material pool, an integral algorithm is used for processing;

[0031] Specifically, the height detected by the second liquid level sensor is h, data is recorded every 10 ms, the average value is calculated for every ten data, and the above steps are repeated after the value is incremented, including the following steps:

[0032] Record data ten times continuously, such as h1, h2, ..., h10;

[0033] The second liquid level sensor displays the average height △h=(h1+h2+…+h10) / 10, △h is the first value of 100ms;

[0034] Then collect the eleventh data and get h11. Remove h1, then

[0035] The sensor shows the average height △h = (h2+h2+…+h11) / 10. At this time, △h is updated to the first value of 100ms.

[0036] Repeat the above steps.

[0037] Furthermore, the absolute difference between the liquid level of the material pool and the spinneret is maintained, using the following formula:

[0038] s2=s1+△hh=b-b1+s+△hh;

[0039] If the absolute error between △h and the reference height h exceeds 0.01 mm, the servo system is controlled to adjust the height.

[0040] The beneficial effects of the present invention are:

[0041] In the present invention, the drafting ratio of the spinning stage is controlled by adjusting the distance between the spinneret and the liquid level in the material pool to ensure the spinning quality; the water pump pumps the liquid in the liquid storage tank into the material pool, and the liquid level in the material pool is detected by a second liquid level sensor arranged on the side of the material pool trough. Multiple connecting pools are interconnected and cooperate with the overflow plates arranged thereon to maintain the same overflow surface height of the connecting pools, ensuring that the overflow surface remains basically unchanged or fluctuates as little as possible, thereby ensuring the spinning quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 This is a schematic diagram of the installation of the liquid level sensor in the present invention;

[0044] Figure 2 It is a structural schematic diagram of the material pool in the present invention;

[0045] Figure 3 It is a structural schematic diagram of the overflow plate in the present invention;

[0046] Figure 4 It is a structural schematic diagram of the magnetostrictive sensor in the present invention;

[0047] Figure 5 This is a schematic structural diagram of the upper limit ring of the floating head in the present invention;

[0048] Figure 6 It is a schematic diagram of regulating the liquid level height of the material pool in the present invention.

[0049] Figure numerals: 1. support frame; 11. first mounting seat; 2. material pool; 21. second mounting seat; 22. partition; 23. connecting pool; 231. liquid inlet; 24. overflow plate; 3. spinneret; 4. liquid storage tank; 41. water pump; 5. second liquid level sensor; 51. detection rod; 52. float; 521. through hole; 53. limit ring; 531. arc-shaped groove; 6. first liquid level sensor. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0051] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0053] like Figures 1 to 6 A raw silk spinning production device shown in the figure includes a material pool 2 and a spinneret 3 arranged above it, the spinneret 3 is arranged on a support frame 1 and is driven by a servo system to move in a vertical direction, and the bottom of the material pool 2 is connected to a liquid storage tank 4 through a water pump 41; a first mounting seat 11 and a second mounting seat 21 are respectively arranged on the support frame 1 and the groove edge of the material pool 2, and a first liquid level sensor 6 and a second liquid level sensor 5 are respectively arranged on the first mounting seat 11 and the second mounting seat 21; the material pool 2 is divided into a plurality of interconnected connecting pools 23 by a partition 22, and a plurality of spinnerets 3 are correspondingly arranged with the connecting pools 23, and the material pool 2 is connected to the liquid storage tank 4 through a liquid inlet 231 opened at the bottom of the connecting pool 23.

[0054] Furthermore, the partition 22 is evenly arranged along the length direction of the material pool 2, and one side of the groove edge in the length direction of the material pool 2 is open; an overflow plate 24 is arranged at the opening position of the groove edge of the material pool 2, and a plurality of overflow plates 24 and the connecting pool 23 are arranged correspondingly. The overflow plate 24 is slidably connected to the connecting pool 23 and can move in the vertical direction; a water collecting trough is arranged near the material pool 2 and on the side where the overflow plate 24 is arranged, and the water collecting trough is arranged along the length direction of the material pool 2. A plurality of spinneret holes are evenly arranged at the bottom of the spinneret 3.

[0055] In the present invention, the drafting ratio in the spinning stage is controlled by adjusting the distance between the spinneret 3 and the liquid surface of the material pool 2 to ensure the spinning quality. Specifically, the distance between the spinneret 3 and the liquid surface is controlled to be as small as possible, while also preventing the spinneret 3 from contacting the liquid surface to prevent the spinneret 3 from being scrapped.

[0056] Due to the different overflow surface heights of each connecting pool 23 and the difference in water tension, the water pump 41 pumps the liquid in the liquid storage tank 4 into the material pool 2, and the second liquid level sensor 5 arranged at the edge of the material pool 2 detects the liquid level in the material pool 2. The multiple connecting pools 23 are interconnected and cooperate with the overflow plates 24 arranged thereon to maintain the same overflow surface height of the connecting pools 23, ensuring that the overflow surface remains basically unchanged or fluctuates as little as possible, thereby ensuring the spinning quality.

[0057] In the present invention, the first liquid level sensor 6 and the second liquid level sensor 5 are both configured as magnetostrictive sensors, and their detection rod 51 and float 52 are both extended into the liquid surface of the material pool 2. The magnetostrictive sensor can accurately detect the absolute position of the movable magnetic ring through internal non-contact measurement and control technology, and the position detected is the most accurate, and the influence of friction during the detection process is minimal, which can effectively improve the accuracy of the detected data.

[0058] As a preferred embodiment of the present invention, the detection rod 51 radially penetrates the through holes 521 at both ends of the float 52, and a limit ring 53 is arranged at the through hole 521, and the limit ring 53 is made of PTFE material; the inner ring of the limit ring 53 is arranged as a plum blossom structure, including four arc grooves 531 evenly arranged along its circumference.

[0059] The rotation angle of the detection rod 51 is limited by the limit ring 53 set in the through holes 521 at both ends of the float 52, and the contact part between the inner circle of the limit ring 53 and the detection rod 51 is made of soft material, which solves the problem that the detection rod 51 and the float 52 of the traditional magnetostrictive sensor are prone to getting stuck.

[0060] Considering the importance of the stability of the distance between the spray and the liquid surface in the chemical spinning industry, which affects the quality of the finished product, the present invention further discloses a method for controlling the draft ratio of raw silk spinning production, using the raw silk spinning production device, comprising the following steps:

[0061] The height position of the liquid level in the material pool 2 is controlled by adjusting the height position of the overflow plate 24, and the overflow plates 24 on the multiple connecting pools 23 are adjusted to make their heights uniform; the liquid in the liquid storage tank 4 is pumped into each connecting pool 23 by the water pump 41, and the liquid level height in the material pool 2 is detected by the second liquid level sensor 5 arranged on the second mounting seat 21, and the liquid level distance between the spinneret 3 and the material pool 2 is detected by the first liquid level sensor 6 on the first mounting seat 11; the spinneret 3 on the support frame 1 is adjusted by the servo system to keep a set distance between it and the liquid surface of the material pool 2; the flow direction of the liquid pump in the liquid storage tank 4 to the material pool 2 is controlled by the water pump 41, so that the liquid level in the material pool 2 is maintained at a set position.

[0062] The magnetostrictive sensor is selected and combined with the integral processing to reduce the sudden change caused by the liquid level fluctuation. The stage-triggered servo system can avoid the oscillation caused by frequent adjustment. Specifically, the monitoring values ​​of the first liquid level sensor 6 and the second liquid level sensor 5 are fed back to the control center and the vertical height of the spinneret 3 is adjusted through the servo system, which specifically includes the following steps:

[0063] The height between the liquid level and the liquid surface is detected by the first liquid level sensor and the second liquid level sensor, and recorded as H and h respectively;

[0064] The distance b between the current spinneret and the liquid surface of the material pool is calculated by the following formula:

[0065] b=h+△ha;

[0066] Wherein, △h=Hh, a represents the distance between the installation position of the first liquid level sensor and the spinneret, and the current position s of the servo system is recorded at the same time;

[0067] According to the distance between the spinneret and the liquid surface of the material pool set according to the process requirements, the adjustment distance s1 of the servo system is calculated using the following formula:

[0068] s1=b-b1+s;

[0069] Among them, b1 represents the distance between the spinneret and the liquid surface of the material pool that needs to be set in the process.

[0070] In the specific implementation process, a magnetostrictive sensor is installed on the first mounting seat of the support frame, and a fixed torque is set by a torque wrench to tighten it. The servo system controls the sensor to move, and the float enters the liquid surface and floats up. After the value is displayed, the current sensor current value is recorded and converted into a height value H. In this embodiment, 4~20mA corresponds to a range of 0~100mm, and the height corresponding to each milliampere is 100mm / (20-4mA), that is, 6.25mm / mA, H=i*6.25.

[0071] The above liquid level detection assumes that the liquid level is static. In fact, the liquid level fluctuates. Here, the liquid level is processed by an integral algorithm and follows the equipment in stages. In the process of the second liquid level sensor detecting the liquid level of the material pool, the integral algorithm is used for processing;

[0072] Specifically, the height detected by the second liquid level sensor is h, data is recorded every 10 ms, the average value is calculated for every ten data, and the above steps are repeated after the value is incremented, including the following steps:

[0073] Record data ten times continuously, such as h1, h2, ..., h10;

[0074] The second liquid level sensor displays the average height △h=(h1+h2+…+h10) / 10, △h is the first value of 100ms;

[0075] Then collect the eleventh data and get h11. Remove h1, then

[0076] The sensor shows the average height △h = (h2+h2+…+h11) / 10. At this time, △h is updated to the first value of 100ms.

[0077] Repeat the above steps, and so on, to ensure the risk of data mutation and that the data will not fluctuate greatly with the liquid after integration.

[0078] Furthermore, the absolute difference between the liquid level of the material pool and the spinneret is maintained, using the following formula:

[0079] s2=s1+△hh=b-b1+s+△hh;

[0080] If the absolute error between △h and the reference height h exceeds 0.01 mm, the servo system is controlled to adjust the height.

[0081] In the present invention, the water pump cooperates with the second liquid level sensor arranged on the material pool to perform PID control on the flow rate, such as Figure 6 In the spinning control process, the draft ratio is related to the spinning speed, the number of spinneret holes, and the hole size of the spinneret. Specifically, under a constant spinning pressure, the spinneret hole size and the number of spinneret holes are inversely proportional to the spinning speed.

[0082] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A raw silk spinning production device, characterized in that: It comprises a material pool (2) and a spinneret (3) arranged above the material pool, wherein the spinneret (3) is arranged on a support frame (1) and is driven by a servo system to move in a vertical direction, and the bottom of the material pool (2) is connected to a liquid storage tank (4) via a water pump (41); A first mounting seat (11) and a second mounting seat (21) are respectively arranged on the support frame (1) and the groove edge of the material pool (2); a first liquid level sensor (6) and a second liquid level sensor (5) are respectively arranged on the first mounting seat (11) and the second mounting seat (21); The material pool (2) is divided into a plurality of interconnected connecting pools (23) by a partition (22), a plurality of the spinnerets (3) are provided corresponding to the connecting pools (23), and the material pool (2) is connected to the liquid storage tank (4) via a liquid inlet (231) provided at the bottom of the connecting pools (23); The first liquid level sensor (6) and the second liquid level sensor (5) are both configured as magnetostrictive sensors, and their detection rods (51) and floats (52) are both extended into the liquid surface of the material pool (2); The detection rod (51) radially penetrates through the through holes (521) at both ends of the floating ball (52), and a limit ring (53) is provided at the through hole (521), and the limit ring (53) is made of PTFE material; The inner ring of the limiting ring (53) is configured as a plum blossom-shaped structure, comprising four arc-shaped grooves (531) evenly distributed along its circumference.

2. The raw silk spinning production device according to claim 1, characterized in that: The partitions (22) are evenly arranged along the length direction of the material pool (2), and one side of the groove edge in the length direction of the material pool (2) is open; An overflow plate (24) is arranged at the opening position of the groove edge of the material pool (2), and a plurality of overflow plates (24) are arranged corresponding to the connecting pool (23).

3. The raw silk spinning production device according to claim 2, characterized in that: The overflow plate (24) is slidably connected to the connecting pool (23) and can move in a vertical direction; A water collecting trough is provided close to the material pool (2) and on the side where the overflow plate (24) is provided, and the water collecting trough is provided along the length direction of the material pool (2).

4. The raw silk spinning production device according to claim 1, characterized in that: A plurality of spinning holes are evenly distributed at the bottom of the spinneret (3).

5. A method for controlling the draft ratio of raw silk spinning production, characterized in that: The raw silk spinning production device according to any one of claims 1 to 4 above comprises the following steps: The height of the liquid level in the material pool (2) is controlled by adjusting the height of the overflow plate (24), and the overflow plates (24) on the plurality of connecting pools (23) are adjusted to make their heights uniform; The liquid in the liquid storage tank (4) is pumped into each connecting pool (23) by a water pump (41), the liquid level in the material pool (2) is detected by a second liquid level sensor (5) arranged on the second mounting seat (21), and the distance between the spinneret (3) and the liquid level in the material pool (2) is detected by a first liquid level sensor (6) on the first mounting seat (11); The spinneret (3) on the support frame (1) is adjusted by a servo system so as to maintain a set distance between the spinneret (3) and the liquid surface of the material pool (2); The flow direction of the liquid in the liquid storage tank (4) to the material pool (2) is controlled by a water pump (41), so that the liquid level in the material pool (2) is maintained at a set position.

6. The method for controlling the draft ratio of raw silk spinning production according to claim 5, characterized in that: The monitoring values ​​of the first liquid level sensor and the second liquid level sensor are fed back to the control center and the vertical height of the spinneret is adjusted through the servo system, which specifically includes the following steps: The height between the liquid level and the liquid surface is detected by the first liquid level sensor and the second liquid level sensor, and recorded as H and h respectively; The distance b between the current spinneret and the liquid surface of the material pool is calculated by the following formula: b=h+△ha; Wherein, △h=Hh, a represents the distance between the installation position of the first liquid level sensor and the spinneret, and the current position s of the servo system is recorded at the same time; According to the distance between the spinneret and the liquid surface of the material pool set according to the process requirements, the adjustment distance s1 of the servo system is calculated using the following formula: s1=b-b1+s; Among them, b1 represents the distance between the spinneret and the liquid surface of the material pool that needs to be set in the process.

7. The method for controlling the draft ratio of raw silk spinning production according to claim 5, characterized in that: In the process of the second liquid level sensor detecting the liquid level height of the material pool, an integral algorithm is used for processing; Specifically, the height detected by the second liquid level sensor is h, data is recorded every 10 ms, the average value is calculated for every ten data, and the above steps are repeated after the value is incremented, including the following steps: Record data ten times continuously, such as h1, h2, ..., h10; The second liquid level sensor displays the average height △h=(h1+h2+…+h10) / 10, △h is the first value of 100ms; Then collect the eleventh data and get h11. Remove h1, then The sensor shows the average height △h = (h2+h2+…+h11) / 10. At this time, △h is updated to the first value of 100ms. Repeat the above steps.

8. The method for controlling the draft ratio of raw silk spinning production according to claim 7, characterized in that: The absolute difference between the liquid level in the material pool and the spinneret is maintained using the following formula: s2=s1+△hh=b-b1+s+△hh; If the absolute error between △h and the reference height h exceeds 0.01 mm, the servo system is controlled to adjust the height.

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