A production process of POY yarn

Abstract

The present invention belongs to the technical field of fiber production, and relates to a production process of POY silk. An oiling pump with one inlet and one outlet is used for oiling. During the oiling process, the tow tension of each spindle position is collected once every 1 to 10 minutes, and after each collection, the change trend of the tow tension of each spindle position over time is judged. When the tow tension of a certain spindle position decreases over time, while the tow tension of the spindle position adjacent to it and participating in the splitting process of the same tow does not change over time, abnormal oiling treatment is carried out on this spindle position. When the tow tension of a certain spindle position decreases over time, while the tow tension of the spindle position adjacent to it and participating in the splitting process of the same tow increases over time, abnormal splitting treatment is carried out on these two spindle positions. When the tow tensions of all spindle positions decrease or increase over time, abnormal vehicle speed treatment is carried out on all spindle positions. The present invention can timely and accurately monitor the abnormal tow tension, timely correct the abnormal situation, improve the product quality and reduce the loss.

Description

Technical Field

[0001] The present invention belongs to the technical field of fiber production, and particularly relates to a production process of POY yarn. Background Art

[0002] In the field of POY yarn production, the fineness, oiling rate, and spinning speed of fibers are one of the important process parameter values. When the fiber passes through the oiling unit, the chemical fiber oil agent will be evenly covered on the surface of the filament bundle, making the fiber have certain softness and smoothness, reducing the friction between single filaments and between the filament bundle and the wire guiding porcelain parts, thereby effectively preventing the generation of fuzz and static electricity of POY yarn. Therefore, in the production process of POY yarn, maintaining the continuity of oiling of the filament bundle has a great impact on the quality of the raw yarn. In addition, during the spinning process, if the filaments are misaligned due to plate cleaning and head generation or floating filaments, the fineness of the filament bundle will change; and the abnormality of the spinning speed will also cause the fineness and elongation not to meet the requirements, all of which will seriously affect the quality of the raw yarn.

[0003] In order to address the above situations, in the current production process, various measures are taken to monitor the relevant physical properties of the filament bundle to reflect the stability of the quality of the raw yarn products. For example, for the oiling rate problem, it mainly relies on periodic sampling and testing with a nuclear magnetic resonance fiber oiling rate analyzer. However, this method has obvious deficiencies: First, the periodic sampling time is long, and both sampling and detection require additional time-consuming, and real-time online monitoring cannot be achieved; Second, for the abnormalities occurring during the sampling interval, timely feedback cannot be provided, which not only affects the product quality but also may lead to an increase in losses. For the problem of misaligned filaments, the measures taken include periodic weighing and manual visual inspection. However, periodic weighing also has the problems of long cycle, inability to perform real-time online monitoring and timely feedback of abnormalities, and the uncertainty brought by human factors is relatively large, and it is easy to miss abnormalities. Finally, for the spinning speed problem, it is determined whether there is a problem by periodic sampling and testing the elongation with a tensile tester. However, this method also has the defects of long periodic sampling time and inability to perform real-time online monitoring, and it cannot respond to the abnormalities during the sampling interval in a timely manner. If an attempt is made to shorten the periodic sampling time, although the feedback speed may be increased, it will lead to a significant increase in the workload, thereby increasing the unit cost of the product.

[0004] Therefore, it is necessary to propose a new production process of POY yarn, in order to be able to timely feedback various abnormalities, enable the operator to timely and correctly correct the abnormalities, and thus improve the product quality and reduce losses. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art and provide a production process of POY yarn.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] The present invention first explored the relationship between the change in the tow tension and the corresponding abnormalities (abnormal oiling, abnormal filament splitting, abnormal vehicle speed) when using a 1-in-1-out oiling pump for oiling after filament splitting during the production process of POY filaments.

[0008] Abnormal oiling: Experiments were conducted using 83 dtex / 144 f filaments. The oiling rate was artificially changed (by changing the rotational speed of the oiling pump), including 5 oiling rate values: 0.48% (standard value), 0.41%, 0.29%, 0.20%, 0.00%. The change in the tow tension of the filaments corresponding to the same filament splitter at 10 bobbins was observed, that is, the tow tension of the filaments on bobbins 1 and 2, the tow tension of the filaments on bobbins 3 and 4, and so on; the results are as Figure 3 shown; from Figure 3 the change in the tow tension of each bobbin shown, it can be seen that when the oiling rate of a certain bobbin changes abnormally (decreases), the tow tension of the filaments on that bobbin decreases, and the tow tension of the filaments on the other bobbin corresponding to the same filament splitter remains unchanged.

[0009] Abnormal filament splitting: Experiments were conducted using 137 dtex / 48 f filaments. The filaments were deliberately mis-split artificially, and the change in the tow tension of the filaments corresponding to the same filament splitter at 10 bobbins was observed, that is, the tow tension of the filaments on bobbins 1 and 2, the tow tension of the filaments on bobbins 3 and 4, and so on; the results are as Figure 4 shown; from Figure 4 the change in the tow tension of the filaments of each bobbin shown, it can be seen that when there is a mis-split of the filaments, the change in the tow tension of the filaments of the two bobbins corresponding to the same filament splitter is opposite, that is, when the tow tension of the filaments on one bobbin increases, the tow tension of the filaments on the other bobbin decreases.

[0010] Abnormal vehicle speed: Experiments were conducted using 83 dtex / 144 f filaments. The vehicle speed was artificially changed to cause abnormal vehicle speed (the normal process vehicle speed is 2480 m / min), and the change in the tow tension of the filaments corresponding to the same filament splitter at 10 bobbins was observed, that is, the tow tension of the filaments on bobbins 1 and 2, the tow tension of the filaments on bobbins 3 and 4, and so on; the results are as Figure 5 shown; from Figure 5 the change in the tow tension of the filaments of each bobbin shown, it can be seen that when the vehicle speed is abnormal, the change in the tow tension of the filaments of the two bobbins corresponding to the same filament splitter is consistent, that is, the tow tension of the filaments on the two bobbins increases or decreases simultaneously.

[0011] Based on the relationship between the change in the tow tension and the corresponding abnormalities obtained from the above exploration, the present application proposes the following technical solutions:

[0012] A production process of POY yarn. During the production of POY yarn, a 1-in-1-out oiling pump is used for oiling. During the oiling process, the tension of the filament bundles at each spindle position is collected once every 1 - 5 minutes. After each collection, the change trend of the tension of the filament bundles at each spindle position over time is judged, and corresponding adjustments are made;

[0013] When the tension of the filament bundle at a certain spindle position decreases over time, and simultaneously, the tension of the filament bundle at the spindle position adjacent to it and participating in the filament splitting process of the same bundle of filaments does not change over time, abnormal oiling treatment is carried out on this spindle position;

[0014] When the tension of the filament bundle at a certain spindle position decreases over time, and simultaneously, the tension of the filament bundle at the spindle position adjacent to it and participating in the filament splitting process of the same bundle of filaments increases over time, abnormal filament splitting treatment is carried out on these two spindle positions;

[0015] When the tension of the filament bundles at all spindle positions decreases over time or increases over time, abnormal vehicle speed treatment is carried out on all spindle positions.

[0016] For a production process of POY yarn as described above, the collection of the tension of the filament bundles at each spindle position is carried out synchronously with the filament guiding. The devices used for both include a filament guiding porcelain part, a metal rod, a metal round tube, a resistance strain gauge, and a computer;

[0017] The filament guiding porcelain part is formed by bending a cylinder a. The metal rod is a cylinder b. The diameters of cylinder a and cylinder b are the same. One end of the filament guiding porcelain part is connected to the metal rod through a plug and glue, and the other end is a free end;

[0018] The metal rod is inserted into the metal round tube, and the two can rotate relative to each other;

[0019] The resistance strain gauge is fixed on the inner wall of the metal round tube and clamped between the metal rod and the metal round tube;

[0020] The horizontal force applied by the filament bundle to the filament guiding porcelain part is conducted to the resistance strain gauge. When the resistance strain gauge is under pressure, its shape and size will change, causing the resistance to change, thereby generating an electrical signal. The computer is used to collect the electrical signal of the resistance strain gauge and perform conversion and analysis to obtain the tension.

[0021] For a production process of POY yarn as described above, the resistance strain gauge is a foil - type resistance chip, designed with a rectangular sensitive grid, and the material is an alloy material such as constantan foil or nichrome foil. It is composed of four resistance chips evenly distributed circumferentially around the central axis of the metal round tube and connected in a Wheatstone full - bridge connection method (this connection method has advantages such as high sensitivity, high measurement accuracy, and good reliability). One of the resistance chips is a measuring resistance chip, and the other three resistance chips are temperature compensation resistance chips used to improve the test accuracy.

[0022] A production process of POY yarn as described above, the devices used in both also include an oil collecting tank; the lower surface of the wire guiding porcelain part is wrapped by the oil collecting tank, and there is a gap between the wire guiding porcelain part and the oil collecting tank. The oil collecting tank can catch the oil drops generated by the yarn bundle on the wire guiding porcelain part and recycle them.

[0023] A production process of POY yarn as described above, each spindle position corresponds to an oil agent pump respectively. When performing abnormal oiling treatment on this spindle position, the rotation speed of the oil agent pump for this spindle position is adjusted to R2. , F1 is the tension value when the tension of the yarn bundle at this spindle position has not changed, F2 is the current value of the tension of the yarn bundle at this spindle position, and R1 is the rotation speed of the oil agent pump when the tension of the yarn bundle at this spindle position has not changed.

[0024] A production process of POY yarn as described above, the method for performing abnormal yarn splitting treatment on these two spindle positions is the same. Specifically: first, judge whether the machine-set weight of the yarn bundle at this spindle position is less than 1.5 kg. If not, perform manual restoration on this spindle position, and downgrade the products of the spindle position with mis-split yarn after full winding; otherwise, perform manual restoration and immediately switch this spinning position after restoration.

[0025] A production process of POY yarn as described above, for performing abnormal vehicle speed treatment on all spindle positions, cut off the yarn bundles of all spindle positions, stop spinning all spindle positions, check all process parameters until they are accurate, and then resume production.

[0026] A production process of POY yarn as described above, the specification of POY yarn is that the single filament fineness is between 50D - 200D, the number of filaments is between 48 - 144F, the unqualified rate of abnormal oiling calculated within a 20-day sampling period does not exceed 0.50%, the unqualified rate of abnormal yarn splitting calculated within the longest actual abnormal yarn splitting time of 2 days in the past does not exceed 0.6%, and the unqualified rate of abnormal vehicle speed calculated within the longest actual abnormal vehicle speed time of 1.5 days in the past does not exceed 3%; if the tension is not monitored and adjusted, the unqualified rate of abnormal oiling calculated within a 20-day sampling period will reach 10%, the unqualified rate of abnormal yarn splitting calculated within the longest actual abnormal yarn splitting time of 2 days in the past will reach 2.00%, and the unqualified rate of abnormal vehicle speed calculated within the longest actual abnormal vehicle speed time of 1.5 days in the past will reach 8.00%.

[0027] Beneficial effects

[0028] The production process of POY yarn of the present invention can timely and accurately reflect abnormal tension, judge the specific abnormal reason based on the abnormal tension information, enable the abnormality to be corrected in time, improve the product quality, and reduce the losses caused by abnormal tension. Description of the drawings

[0029] Figure 1Partial structural schematic diagram of the device for synchronously collecting the tension of the tow at each spindle position and guiding the wire in the present invention;

[0030] Figure 2 Schematic diagram of the positional relationship among the oil collecting tank, the wire guiding porcelain part, and the tow in the device for synchronously collecting the tension of the tow at each spindle position and guiding the wire in the present invention;

[0031] Figure 3 Graph of the tow tension change at each spindle position obtained during the abnormal oiling experiment of the present invention;

[0032] Figure 4 Graph of the tow tension change at each spindle position obtained during the abnormal wire splitting experiment of the present invention;

[0033] Figure 5 Graph of the tow tension change at each spindle position obtained during the abnormal vehicle speed experiment of the present invention;

[0034] Among them, 1 - metal rod, 3 - resistance strain gauge, 4 - plug, 5 - wire guiding porcelain part, 6 - tow, 7 - metal round tube, 8 - oil collecting tank. Detailed implementation manners

[0035] The present invention will be further described below in conjunction with the detailed implementation manners. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0036] Explanation of relevant indicators in the embodiments:

[0037] The unqualified rate of abnormal oiling calculated within a 20-day sampling period: It means that the cycle required for completely sampling and measuring the oil content of 10 spindles of raw silk at one spinning position is 20 days, and the proportion of unqualified products produced within 20 days in the total output of a single spinning position in 20 days;

[0038] The unqualified rate of abnormal wire splitting calculated within the previous actual longest wire splitting abnormal time of 2 days: It is based on the longest time (2 days) from the occurrence of the abnormality to the discovery of the abnormality by manual inspection and the taking of corrective measures during the production process, and the proportion of unqualified products produced within these 2 days in the total output of a single spinning position in 20 days;

[0039] The unqualified rate of abnormal vehicle speed calculated within the previous actual longest vehicle speed abnormal time of 1.5 days: It is based on the longest time (1.5 days) from the occurrence of the abnormality to the discovery of the abnormality by manual inspection and the taking of corrective measures during the production process, and the proportion of unqualified products produced within these 1.5 days in the total output of this spinning position in 20 days.

[0040] A device for synchronously collecting the tension of the tow at each spindle position and guiding the wire, asFigure 1 As shown, it includes a wire guide porcelain part 5, a metal rod 1, a metal round tube 7, an oil collecting tank 8, a resistance strain gauge 3 and a computer;

[0041] The wire guide porcelain part 5 is formed by bending and deforming a cylinder a;

[0042] The metal rod 1 is a cylinder b, and the diameters of the cylinder a and the cylinder b are the same;

[0043] One end of the wire guide porcelain part 5 is connected to the metal rod 1 through a pin 4 and glue, and the other end is a free end; the metal rod 1 is inserted into the metal round tube 7, and the two can rotate relative to each other;

[0044] The lower surface of the wire guide porcelain part 5 is wrapped by the oil collecting tank 8. As Figure 2 shown, there is a gap between the wire guide porcelain part 5 and the oil collecting tank 8; the oil collecting tank 8 can catch the oil drops generated by the filament bundle 6 on the wire guide porcelain part 5;

[0045] As Figure 1 shown, the resistance strain gauge 3 is fixed on the inner wall of the metal round tube 7 and is clamped between the metal rod 1 and the metal round tube 7; the resistance strain gauge 3 is a foil resistance gauge (the material is alloy materials such as constantan foil or nichrome foil, etc.), and adopts a rectangular sensitive grid design. It is composed of four resistance gauges evenly distributed around the central axis of the metal round tube 7 and connected in a Wheatstone bridge manner. One of the resistance gauges is a measuring resistance gauge, and the other three resistance gauges are temperature compensation resistance gauges;

[0046] The computer is used to collect the electrical signals of the resistance strain gauge 3, and perform conversion and analysis to obtain the tension.

[0047] Example 1

[0048] A production process of POY yarn. For oiling, a 1-inlet and 1-outlet oil agent pump is used. During the oiling process, the device for synchronously collecting the tension of the filament bundle at each spindle position and guiding the wire as described above is used to collect the tension of the filament bundle at each spindle position once every 1 minute (collecting the tension of the filament bundle at each spindle position and guiding the wire are carried out synchronously). After each collection, the change trend of the tension of the filament bundle at each spindle position with time is judged, and corresponding adjustments are made;

[0049] When the tension of the filament bundle at a certain spindle position decreases with time, and synchronously, when the tension of the filament bundle at the spindle position adjacent to it and jointly participating in the splitting process of the same filament bundle does not change with time, abnormal oiling treatment is carried out on this spindle position: each spindle position corresponds to an oil agent pump respectively. Carrying out abnormal oiling treatment on this spindle position means adjusting the rotation speed of the oil agent pump of this spindle position to R2, , where F1 is the tension value when the tension of the filament bundle at this spindle position does not change, F2 is the current value of the tension of the filament bundle at this spindle position, and R1 is the rotation speed of the oil agent pump when the tension of the filament bundle at this spindle position does not change;

[0050] When the tension of the tow at a certain spindle position decreases with time, and synchronously, the tension of the tow at the spindle position adjacent to it and jointly participating in the tow splitting process of the same tow increases with time, perform tow splitting abnormality processing on these two spindle positions; the methods for performing tow splitting abnormality processing on these two spindle positions are the same. Specifically: first, determine whether the weight of the tow at this spindle position is less than 1.5 kg in the machine setting. If not, perform manual restoration on this spindle position, and downgrade the products at the spindle positions where the wrong tow is split after full winding; otherwise, perform manual restoration and immediately switch this spinning position after restoration;

[0051] When the tensions of the tows at all spindle positions all decrease with time or all increase with time, perform vehicle speed abnormality processing on all spindle positions: that is, cut off the tows at all spindle positions, stop spinning all spindle positions, check all process parameters until they are accurate, and then resume production;

[0052] The specification of the produced POY tow is 50D / 144f. During the spinning process, the number of spindle positions is 10. The temperature after the heat exchanger is 278.2 °C, the heat medium temperature of the melt pipe is 282.7 °C, the cooling air speed is 0.28 m / s, the cooling air temperature is 19 °C, the cooling air pressure is 460 Pa, the cooling air humidity is 88%, the spinning speed is 2480 m / s, and the oil content is 0.48%;

[0053] The unqualified rate of abnormal oiling calculated within a 20-day sampling period is 0.25%. The unqualified rate of tow splitting abnormality calculated within the longest actual tow splitting abnormality time of 2 days in the past is 0.51%. The unqualified rate of vehicle speed abnormality calculated within the longest actual vehicle speed abnormality time of 1.5 days in the past is 2.53%.

[0054] Example 2

[0055] A production process of POY tow uses the same spinning equipment as in Example 1.

[0056] The specification of the produced POY tow is 75D / 72f. During the spinning process, the tension of the tow at each spindle position is collected once every 2 minutes. The number of spindle positions is 10. The temperature after the heat exchanger is 282.5 °C, the heat medium temperature of the melt pipe is 282.7 °C, the cooling air speed is 0.4 m / s, the cooling air temperature is 19.5 °C, the cooling air pressure is 480 Pa, the cooling air humidity is 92%, the spinning speed is 2950 m / s, and the oil content is 0.36%;

[0057] The unqualified rate of abnormal oiling calculated within a 20-day sampling period is 0.13%. The unqualified rate of tow splitting abnormality calculated within the longest actual tow splitting abnormality time of 2 days in the past is 0.26%. The unqualified rate of vehicle speed abnormality calculated within the longest actual vehicle speed abnormality time of 1.5 days in the past is 1.29%.

[0058] Example 3

[0059] A production process of POY yarn, using the same spinning equipment as in Example 1.

[0060] The produced POY yarn has a specification of 150D / 48F. During the spinning process, the tension of the filament bundles at each spindle position is collected once every 3 minutes. The number of spindle positions is 10. The temperature after the heat exchanger is 277.6°C, the heat medium temperature of the melt pipe is 282.7°C, the cooling air speed is 0.62 m / s, the cooling air temperature is 18°C, the cooling air pressure is 450 Pa, the cooling air humidity is 83%, the spinning speed is 3200 m / s, and the oil content is 0.28%;

[0061] The unqualified rate of abnormal oiling calculated within a 20-day sampling period is 0.06%. The unqualified rate of abnormal filament splitting calculated within the longest actual filament splitting abnormal time of 2 days in the past is 0.12%. The unqualified rate of abnormal vehicle speed calculated within the longest actual vehicle speed abnormal time of 1.5 days in the past is 0.60%.

[0062] Example 4

[0063] A production process of POY yarn, using the same spinning equipment as in Example 1.

[0064] The produced POY yarn has a specification of 200D / 48f. During the spinning process, the tension of the filament bundles at each spindle position is collected once every 4 minutes. The number of spindle positions is 10. The temperature after the heat exchanger is 278°C, the heat medium temperature of the melt pipe is 283°C, the cooling air speed is 0.66 m / s, the cooling air temperature is 18°C, the cooling air pressure is 450 Pa, the cooling air humidity is 86%, the spinning speed is 3200 m / s, and the oil content is 0.33%;

[0065] The unqualified rate of abnormal oiling calculated within a 20-day sampling period is 0.05%. The unqualified rate of abnormal filament splitting calculated within the longest actual filament splitting abnormal time of 2 days in the past is 0.09%. The unqualified rate of abnormal vehicle speed calculated within the longest actual vehicle speed abnormal time of 1.5 days in the past is 0.46%.

[0066] Example 5

[0067] A production process of POY yarn, using basically the same spinning equipment as in Example 1, except that: the computer in the device for synchronously collecting the tension of the filament bundles at each spindle position and guiding the filaments is removed, and during the production process, the tension of the filament bundles at each spindle position is collected once every 1 minute through an additional tensiometer.

[0068] The produced POY yarn has a specification of 50D / 144f, and the process parameters during the spinning process are the same as in Example 1;

[0069] The unqualified rate of abnormal oiling calculated within a 20-day sampling period is 0.48%. The unqualified rate of abnormal filament splitting calculated within the longest actual abnormal filament splitting time of 2 days in the past is 0.8%. The unqualified rate of abnormal vehicle speed calculated within the longest actual abnormal vehicle speed time of 1.5 days in the past is 2.9%.

[0070] Compared with Example 1, the unqualified rate of abnormal oiling and the unqualified rate of abnormal filament splitting in Example 5 are increased. This is because during the production process of POY filaments in Example 5, the tensions of guiding the filaments and collecting the filament bundles at each spindle position are not carried out simultaneously, and the abnormal tension of the filament bundles cannot be monitored in a timely and accurate manner, resulting in the inability to correct the abnormality in a timely manner and increasing the unqualified rate of the produced products.

[0071] Example 6

[0072] A production process of POY filaments, using a spinning device basically the same as that in Example 1, with the only difference being that:

[0073] The resistance strain gauge is composed of four resistance chips distributed on both sides of the inner wall of the metal circular tube and connected in a 1 / 4 bridge connection method (single-arm bridge connection method). One of the resistance chips is a measuring resistance chip located on one side of the inner wall of the metal circular tube, and the other three are standard resistance chips (with fixed resistance values) located on the other side of the inner wall of the metal circular tube and evenly distributed along the axial direction of the metal circular tube.

[0074] The specification of the produced POY filaments is 50D / 144f, and the process parameters during the spinning process are the same as those in Example 1;

[0075] The unqualified rate of abnormal oiling calculated within a 20-day sampling period is 0.35%. The unqualified rate of abnormal filament splitting calculated within the longest actual abnormal filament splitting time of 2 days in the past is 0.6%. The unqualified rate of abnormal vehicle speed calculated within the longest actual abnormal vehicle speed time of 1.5 days in the past is 2.7%.

[0076] Compared with Example 1, the unqualified rate of abnormal oiling and the unqualified rate of abnormal filament splitting in Example 6 are increased. This is because the resistance chips in Example 6 are connected in a 1 / 4 bridge connection method (single-arm bridge connection method). In a single-arm bridge, the standard resistance chip and the measuring resistance chip are connected on a proportional arm. This connection method has relatively low sensitivity, and the temperature changes of the measuring resistance chip and the standard resistance chip will have a greater impact on the measurement result, resulting in inaccurate detection results and the inability to correct the abnormality correctly in a timely manner, increasing the unqualified rate of the produced products.

Claims

1. A production process of POY yarn, characterized in that, During the production process of POY yarn, a 1-in-1-out oiling pump is used for oiling. During the oiling process, the tension of the tow at each spindle position is collected once every 1 - 5 minutes. After each collection, the change trend of the tension of the tow at each spindle position over time is judged, and corresponding adjustments are made; When the tension of the tow at a certain spindle position decreases over time, and synchronously, the tension of the tow at the spindle position adjacent to it and participating in the filament splitting process of the same tow does not change over time, abnormal oiling treatment is carried out on this spindle position; When the tension of the tow at a certain spindle position decreases over time, and synchronously, the tension of the tow at the spindle position adjacent to it and participating in the filament splitting process of the same tow increases over time, abnormal filament splitting treatment is carried out on these two spindle positions; When the tension of the tows at all spindle positions decreases or increases over time, abnormal vehicle speed treatment is carried out on all spindle positions.

2. The production process of a POY yarn according to claim 1, characterized in that, The collection of the tension of the tows at each spindle position is carried out synchronously with wire guiding. The devices used for both include a wire guiding porcelain part (5), a metal rod (1), a metal round tube (7), a resistance strain gauge (3), and a computer; The wire guiding porcelain part (5) is formed by bending a cylinder a. The metal rod (1) is a cylinder b. The diameters of cylinder a and cylinder b are the same. One end of the wire guiding porcelain part (5) is connected to the metal rod (1), and the other end is a free end; The metal rod (1) is inserted into the metal round tube (7), and the two can rotate relative to each other; The resistance strain gauge (3) is fixed on the inner wall of the metal round tube (7) and clamped between the metal rod (1) and the metal round tube (7); The computer is used to collect the electrical signals of the resistance strain gauge (3), and perform conversion and analysis to obtain the tension.

3. The production process of a POY yarn according to claim 2, characterized in that, The resistance strain gauge is a foil resistance chip, designed with a rectangular sensitive grid, and is composed of four resistance chips evenly distributed around the central axis of the metal round tube (7) and connected in a Wheatstone full bridge connection. One of the resistance chips is a measuring resistance chip, and the other three resistance chips are temperature compensation resistance chips.

4. The production process of a POY yarn according to claim 2, characterized in that, The devices used for both also include an oil collecting tank (8); the lower surface of the wire guiding porcelain part (5) is wrapped by the oil collecting tank (8), and there is a gap between the wire guiding porcelain part (5) and the oil collecting tank (8).

5. The production process of a POY filament according to claim 1, characterized in that Each spindle position corresponds to an oil agent pump respectively. When performing abnormal oiling treatment on this spindle position, the rotation speed of the oil agent pump for this spindle position is adjusted to R2. , F1 is the tension value when the tension of the tow at this spindle position does not change, F2 is the current value of the tension of the tow at this spindle position, and R1 is the rotation speed of the oil agent pump when the tension of the tow at this spindle position does not change.

6. The production process of a POY yarn according to claim 1, characterized in that, The method for abnormal filament splitting treatment of these two spindle positions is the same. Specifically, first judge whether the specified weight of the tow at this spindle position is less than 1.5 kg. If not, perform manual restoration on this spindle position, and downgrade the products of the spindle positions with mis-split filaments at this spinning position after full winding; otherwise, perform manual restoration, and immediately switch this spinning position after restoration.

7. The production process of a POY filament according to claim 1, characterized in that, Performing abnormal vehicle speed treatment on all spindle positions means cutting off the tows at all spindle positions, stopping spinning at all spindle positions, checking all process parameters until they are accurate, and then resuming production.

8. A production process of POY yarn according to any one of claims 1 to 7, characterized in that, The specification of POY yarn is that the single filament fineness is between 50D - 200D, and the number of filaments is between 48 - 144F. The unqualified rate of abnormal oiling calculated within a 20-day sampling period does not exceed 0.50%. The unqualified rate of abnormal filament splitting calculated within the longest actual filament splitting abnormal time of 2 days in the past does not exceed 0.6%. The unqualified rate of abnormal vehicle speed calculated within the longest actual vehicle speed abnormal time of 1.5 days in the past does not exceed 3%.

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