Method for judging operation condition of shifting fork

Abstract

The invention belongs to the technical field of spinning, and relates to a method for judging the operation condition of a shifting fork, which specifically comprises the following steps of: acquiring an operation track image of a single yarn between a yarn guide hook and a shifting fork forming plate for n times of back-and-forth movement, intercepting a rectangular area A from the operation track image, equally dividing the rectangular area A into m sub-areas along a direction X, the pixel number proportion TDI of the moving trajectory in each sub-region is calculated, the sub-region with the TDI higher than the average value is judged as a dense trajectory region, other sub-regions are judged as non-dense trajectory regions, the adjacent dense trajectory regions are added, at least three new regions are obtained and include the region B1, the region C and the region B2, the length of the region B1 in the direction X is LB1, the length of the region B2 in the direction X is LB2, and the length of the region B2 in the direction X is LB2. The area C is located in the middle of the rectangular area A, and the operation condition of the shifting fork is judged according to the number of the new areas, LB1, LB2 and Lg. By acquiring the yarn moving track image, the moving condition of the shifting fork can be judged, and the problem of the shifting fork can be found in time.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning and relates to a method for judging the operating condition of a shift fork. Background Art

[0002] In chemical fiber production, after yarn is shaped, it passes through a winding machine to complete the package formation process. Current mainstream winding equipment uses a shifting fork mechanism to drive the yarn back and forth to form the package. However, as a precision component operating at high speed, even minor faults or damage to the shifting fork can be difficult to detect during operation. Such hidden dangers not only directly impact product quality, but by the time problems become apparent, they often result in batches of abnormal yarn cakes being transferred to downstream processes, causing significant losses for downstream users.

[0003] Despite the significant technological iterations of the winding equipment, the core structure of the fork mechanism still maintains the traditional design - consisting of a fork forming plate 1, two relatively rotating paddles 2 (Y-shaped), and working in conjunction with the left slack guide 3 and the right slack guide 4 (such as Figure 8 As shown in the figure, the paddle 2 drives the yarn 5 to reciprocate along the edge of the shift fork forming plate 1 to achieve uniform winding. In actual production, damage to the shift fork forming plate can cause yarn shaving, resulting in fluffy yarn on the winding surface of the yarn cake. Damage to the shift fork porcelain blades can easily cause yarn scratches, resulting in fluffy yarn or continuous yarn breakage. And deviation in the paddle limit not only leads to abnormal yarn cake winding shape, but can also cause serious quality defects such as "ant spots" during the yarn dyeing process.

[0004] Currently, shift fork quality inspection still primarily relies on manual post-production inspections. This approach is limited by the professional expertise of inspectors and carries a high risk of missed inspections. Furthermore, due to the long inspection cycle, it's difficult to intercept abnormal products in real time, posing risks to the company and its downstream supply chain. In the field of dynamic inspection technology, existing methods measure the temperature at both ends of the bobbin to determine shift fork limit differences. However, because temperature has no direct correlation with mechanical damage to the shift fork (such as defects on the fork forming plate or worn shifting blades), this method can only indirectly reflect some mechanical issues. Furthermore, it is susceptible to environmental interference, resulting in insufficient accuracy. This method fails to cover the diverse fault types of the shift fork assembly and struggles to meet the real-time monitoring needs of the production process.

[0005] Therefore, it is of great significance to study a method for judging the operating status of the shift fork to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems existing in the prior art and to provide a method for judging the operating status of a shift fork.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A method for determining the operating condition of a shift fork comprises the following steps:

[0009] (1) During the operation of the winding machine, collect the trajectory images of a single yarn between the wire guide hook and the fork forming plate for n round trips. n should not be too large, otherwise the dense trajectory area cannot be distinguished later. n is a positive integer less than 4;

[0010] The forward or reverse direction of the yarn is recorded as direction X;

[0011] (2) Cut out the rectangular area A from the running trajectory image;

[0012] A pair of opposite sides of the rectangular area A is parallel to the direction X (i.e., the direction of the line connecting the transition point on the left slack yarn guide and the transition point on the right slack yarn guide), the main portion of the pair of opposite sides is located within the running track area in the running track image, with both ends protruding therefrom, the length of the pair of opposite sides is L, and the length of the other pair of opposite sides is W;

[0013] In the running trajectory image, the distance from the guide wire hook to the fork forming plate is D a , the distance from the rectangular area A to the fork forming plate is D A , D a D A 5-10 times;

[0014] The length of the running track area in the rectangular area A along the direction X is L g ;

[0015] (3) Divide the rectangular area A into m sub-areas along the direction X, where the value of m ranges from 100 to 250. Calculate the percentage of pixels with running trajectories in each sub-area (TDI = number of pixels with running trajectories in the sub-area / total number of pixels in the sub-area × 100%). The sub-areas with TDI higher than the average value are identified as dense trajectory areas, and the other sub-areas are identified as non-dense trajectory areas.

[0016] (4) Add the adjacent dense trajectory areas to obtain at least three new areas, namely area B1, area C and area B2. Area B1 is close to the left end of the rectangular area A and its length along the direction X is L. B1 , area B2 is close to the right end of rectangular area A and its length along direction X is L B2 , area C is located in the middle of rectangular area A;

[0017] (5) Judgment;

[0018] According to the number of new regions, L B1 , L B2 , L g Determine the operating status of the shift fork.

[0019] As the preferred technical solution:

[0020] In the method for determining the operating condition of a shift fork as described above, in step (1), an image acquisition device is used to acquire an image of the operating trajectory;

[0021] The image acquisition device includes a camera and a flash light;

[0022] The preset focal length of the camera is the distance between the camera and the yarn. The exposure time of the camera is set according to the speed of the shift fork at the time of shooting. The shift fork speed is 2000-3000 cpm (driving the yarn to and fro about 30-50 times / s), and the exposure time of the camera is 0.02-0.1s. The shift fork speed and exposure time work together to determine the total number of yarn to and fro movements in the running trajectory image.

[0023] During the shooting process, the yarn is highlighted by the flash light and the background is darkened to facilitate the distinction of the density of the yarn movement trajectory;

[0024] The periodic interval for collecting running trajectory images is 30-60 minutes.

[0025] In the above-mentioned method for judging the running condition of the shift fork, the camera shoots from inside the winding machine to the outside, so that the background of the running track image taken under a certain focal length and fill light is black and the running track of the yarn is white.

[0026] In the method for determining the operating condition of a shift fork as described above, the image acquisition device further includes a drive motor and a guide rail; the guide rail is parallel to the direction X, and the drive motor is used to drive the camera and the flash to move along the guide rail to measure the operating conditions of the shift forks at different spindle positions in the same machine (a machine generally produces 12-16 ingots of silk cakes at the same time, each ingot of silk cake corresponds to an ingot shift fork, and the shift forks are independent of each other. Generally, when a shift fork has an abnormality, only one of the ingot shift forks is abnormal, so the image acquisition device needs to be moved to measure the operating conditions of the shift forks at different spindle positions).

[0027] In the method for judging the operating condition of the shift fork as described above, in step (1), the process of a single reciprocating motion is: the yarn is driven by the shift piece and moves along the shift fork forming plate from the transition point on the left slack guide to the transition point on the right slack guide, and then returns to the transition point on the left slack guide.

[0028] In the above method for judging the operating condition of the shift fork, in step (2), L is 300-500 times W, D a It is 1500-2000 times that of W.

[0029] In the above method for judging the operation status of the shift fork, in step (5), according to the number of new areas, L B1 , L B2 , Lg Judging the operation status of the shift fork is: when L B1 or L B2 Not less than 0.02L g When , it is determined that the shift fork limit is abnormal;

[0030] When there are other new areas in the middle of the rectangular area A in addition to area C, it is determined that the fork forming plate or fork blade is damaged;

[0031] When L g <0.98L g *, it is determined that the shift fork is not shifted, where L g * is the L detected within one consecutive day during the production process of the shift fork without abnormal operation g The average value of the shift fork is that there is no abnormal operation state of the shift fork. You can confirm whether the shift fork is intact by stopping the inspection, and measure the yarn tension value within the process range. After the inspection and confirmation, manually start the detection Lg, and continuously detect for 1 day and take the average value to obtain Lg*;

[0032] When L g >1.02L g *, it is judged that the fork stroke is too large or the yarn tension is too small.

[0033] The principle of the change in the trajectory of a single yarn caused by abnormal operation of the shift fork:

[0034] After the yarn passes through the wire guide hook on the machine, it moves back and forth under the action of the shift fork, so that the yarn is wound and formed. Because the shift fork drives the yarn to move back and forth, the yarn trajectory is fan-shaped between the wire guide hook and the shift fork forming plate. At both ends, the pause time is prolonged due to the turning direction of the yarn, resulting in a dense trajectory.

[0035] When the shift fork operates abnormally, such as when the relative limit between the two shift forks (denoted as shift fork A and shift fork B) deviates, the yarn will reach one end of the forming plate under the action of shift fork A, but shift fork B will not reach that position. The yarn cannot return immediately under the action of shift fork B, resulting in a prolonged pause time of the yarn at that position and a dense trajectory.

[0036] When the fork forming plate or the fork blade is damaged, the friction force on the yarn increases when the yarn passes through the damaged point, and the yarn pauses at this point for a longer time, resulting in a dense trajectory;

[0037] If the shift fork is not opened or the stroke is too large, the width of the yarn running track at the fixed position will become smaller or larger; when the tension is too small, the yarn will jitter more between the wire guide hook and the shift fork, and will be in an arc shape on both sides, which will increase the width of the yarn running track at the fixed position.

[0038] Beneficial effects

[0039] A method for judging the operating condition of a shift fork of the present invention uses an image acquisition device to capture the running trajectory of the yarn when it passes between the wire guide hook and the shift fork forming plate to determine whether there is any abnormality in the operating condition of the shift fork. This method can effectively avoid subsequent product defects caused by fork limiting (such as ant spots during dyeing) and yarn fuzz caused by damage to the shift fork forming plate or fork blades.

[0040] The method for judging the operating condition of a shift fork of the present invention can periodically obtain a yarn running trajectory image, thereby achieving the purpose of monitoring the long-term operating condition of the shift fork and ensuring the quality of the produced products. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the motion trajectory of a single yarn and the division of the abnormal judgment area when the shift fork is operating normally. The yarn has narrow and dense trajectories in the turning areas on the left and right sides;

[0042] Figure 2 Schematic diagram of the movement trajectory of a single yarn and the distribution of dense areas when the shift fork limit is abnormal, corresponding to Example 1;

[0043] Figure 3 Schematic diagram of the movement trajectory of a single yarn and the additional dense area when the fork forming plate is damaged, corresponding to Example 2;

[0044] Figure 4 Schematic diagram of the movement trajectory and width abnormality of a single yarn when the yarn tension is too small, corresponding to Example 3;

[0045] Figure 5 The rectangular area A is divided into equal parts and L, W, L g Dimensional diagram;

[0046] Figure 6 For L B1 , L B2 , L C Dimensional diagram;

[0047] Figure 7 A schematic diagram of the installation position of the image acquisition device;

[0048] Figure 8 Schematic diagram of the structure of the shift fork mechanism;

[0049] Among them, 1-fork forming plate, 2-paddle, 3-left slack wire guide, 4-right slack wire guide, 5-yarn, 6-wire guide hook, 7-rectangular area A, 8-conversion point on the left slack wire guide, 9-conversion point on the right slack wire guide, 10-image acquisition device. DETAILED DESCRIPTION

[0050] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, 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 fall equally within the scope limited by the appended claims of the application.

[0051] A method for judging the operating status of a shift fork, the specific steps are as follows:

[0052] (1) Acquire images;

[0053] (1.1) Prepare an image acquisition device, including a camera, a flash, a drive motor, and a guide rail. The guide rail is parallel to the direction X (the direction of the yarn's forward or reverse motion is denoted as direction X). The drive motor is used to drive the camera and flash along the guide rail to measure the operating conditions of the shift forks at different spindle positions within the same machine.

[0054] (1.2) During the operation of the winding machine, if Figure 1 As shown, an image acquisition device is used to capture running trajectory images of a single yarn 5 located between the wire guide hook 6 and the shift fork forming plate 1 making n reciprocating motions (the process of a single reciprocating motion is: the yarn 5, driven by the shifting piece 2, moves along the shift fork forming plate 1 from the transition point 8 on the left slack wire guide 3 to the transition point 9 on the right slack wire guide 4, and then returns to the transition point 8 on the left slack wire guide 3), where n is a positive integer less than 4;

[0055] Specific parameter settings: the preset focal length of the camera is the distance between the camera and the yarn 5, the fork running speed is 2000-3000 cpm, the camera exposure time is 0.02-0.1s; during the shooting process, the flash is used to fill in the light to highlight the yarn 5 and darken the background (such as Figure 7 As shown, the camera of the image acquisition device 10 shoots from inside the winding machine to the outside); the cycle interval for collecting the running trajectory image is 30-60 minutes;

[0056] (2) Cut out the rectangular area A7 from the running trajectory image;

[0057] A set of opposite sides of the rectangular area A7 is parallel to the direction X, the main part of the set of opposite sides is located in the running track area in the running track image, and the two ends are exposed therefrom, the length of the set of opposite sides is L, and the length of the other set of opposite sides is W, where L is 300-500 times W;

[0058] In the running track image, the distance between the wire guide hook 6 and the fork forming plate 1 is D a The distance from the rectangular area A7 to the fork forming plate 1 is D A , D a D A 5-10 times of Da 1500-2000 times of W;

[0059] The length of the running track area in the rectangular area A7 along the direction X is L g (L, W, L g The size of Figure 5 shown);

[0060] (3) Divide the rectangular area A7 into m sub-areas along the direction X, where the value of m ranges from 100 to 250 (e.g. Figure 5 As shown in the figure, calculate the percentage of pixels of running tracks in each sub-area (TDI), and determine the sub-area with TDI higher than the average value as dense track area, and the other sub-areas as non-dense track area;

[0061] (4) Add the adjacent dense trajectory areas to obtain at least three new areas, namely area B1, area C and area B2. Area B1 is close to the left end of the rectangular area A7 and its length along the direction X is L. B1 , area B2 is close to the right end of rectangular area A7 and its length along direction X is L B2 , area C is located in the middle of rectangular area A 7 and its length along direction X is L C (L B1 , L B2 , L C The size of Figure 6 shown);

[0062] (5) Judgment;

[0063] According to the number of new regions, L B1 , L B2 , L g Determine the operating status of the shift fork, specifically:

[0064] When L B1 or L B2 Not less than 0.02L g When , it is determined that the shift fork limit is abnormal;

[0065] When there are other new areas in the middle of the rectangular area A 7 in addition to the area C, it is determined that the fork forming plate 1 is damaged or the fork blade is damaged;

[0066] When L g <0.98L g *, it is determined that the shift fork is not shifted, where L g * is the L detected within one consecutive day during the production process of the shift fork without abnormal operation g The average value of

[0067] When L g >1.02Lg *, it is determined that the fork stroke is too large or the tension of the yarn 5 is too small.

[0068] Example 1

[0069] A shift fork with abnormal limit was selected, and the limit deviation between the fork blades was measured to be 4mm. The shift fork was installed on the 11th spindle position of a certain machine and then spun into yarn. During the spinning process, the shift fork operating status was analyzed in real time according to the above method for judging the operating status of the shift fork.

[0070] The spinning process parameters are as follows: product specification 83dtex / 36f, winding speed 5000m / min;

[0071] The speed of the shift fork at a certain moment during the operation of the machine is 2784 cpm. Based on the speed of the shift fork at this time, the exposure time of the camera is set to 0.043 s, and the running trajectory image of the 11th spindle single yarn making two round trip movements is obtained (such as Figure 2 shown);

[0072] The running trajectory image processing parameters are: D a D A 10 times, D a is 1800 times of W, L is 500 times of W, and the rectangular area A is divided into 250 sub-areas along the direction X;

[0073] The parameters obtained by image analysis are as follows: the length Lg of the yarn running track area in the rectangular area A along the direction X is 88.2 mm; by adding the adjacent dense track areas, three new areas (area B1, area C and area B2) are obtained, L B1 5.1mm, L B2 0.9mm, L C 0.8mm;

[0074] According to the judgment rules, because L B1 Not less than 0.02L g Therefore, it is determined that the shift fork limit is abnormal, indicating that the above method for judging the operating status of the shift fork can accurately identify the shift fork limit abnormality, which matches the actual 4mm limit deviation fault, verifying the accuracy of the above method.

[0075] Example 2

[0076] A shift fork with a damaged forming plate was selected. Measurements showed that the defect on the fork forming plate was 17 mm from the right slack yarn guide along the X direction, and the defect width was 1 mm. The fork was then installed at the 10th spindle position on a certain machine for spinning production. During the spinning process, the shift fork's operating status was analyzed in real time using the above-mentioned method for determining the shift fork's operating status.

[0077] The spinning process parameters are as follows: product specification 167dtex / 48f, winding speed 4700m / min;

[0078] The speed of the shift fork at a certain moment in the machine operation is 2592 cpm. According to the speed of the shift fork at this time, the exposure time of the camera is set to 0.046 s, and the running trajectory image of the 10th spindle single yarn making two round trip movements is obtained (such as Figure 3 shown);

[0079] The running trajectory image processing parameters are: D a D A 5 times, D a is 2000 times of W, L is 400 times of W, and the rectangular area A is equally divided into 100 sub-areas along the direction X;

[0080] The parameters obtained by image analysis are as follows: the length of the yarn running track area in the rectangular area A along the direction X is Lg, which is 70.9 mm. By adding the adjacent dense track areas, four new areas are obtained (area B1, area C, area B2, and area D. Area D is located in the middle of the rectangular area A and between areas B1 and C. The length of area D along the direction X is recorded as L D ), L B1 0.8mm, L B2 0.9mm, L C 0.7mm, L D 1.6mm;

[0081] According to the judgment rules, since there is area D in addition to areas B1, B2, and C, it is determined to be a damage to the fork forming plate or the fork blade, which matches the actual defect fault on the fork forming plate, which is 17 mm away from the right slack wire guide in the X direction and 1 mm wide. This shows that the above method for judging the operating condition of the fork can accurately identify defect-type damage on the fork forming plate, and can locate the damage position through trajectory abnormalities, verifying the accuracy of the above method.

[0082] Example 3

[0083] Select a machine that is operating normally during the spinning process, and adjust the yarn tension to reduce the yarn tension (the average winding tension measured initially is 16 cN, L g * is 90.0 mm), and according to the above method for judging the operating status of the shift fork, the operating status of the shift fork during the spinning process is analyzed in real time;

[0084] The spinning process parameters are as follows: product specification 83dtex / 36f, winding speed 5150m / min, and the average winding tension after adjustment is 11cN;

[0085] The speed of the shift fork at a certain moment during the operation of the machine is 2187 cpm. Based on the speed of the shift fork at this time, the exposure time of the camera is set to 0.055 s, and the running trajectory image of the single yarn of the 5th spindle making two round trip movements is obtained (such as Figure 4 shown);

[0086] The running trajectory image processing parameters are: D a D A 10 times, D a is 1500 times of W, L is 500 times of W, and the rectangular area A is divided into 250 sub-areas along the direction X;

[0087] The parameters obtained by image analysis are as follows: the length Lg of the yarn running track area in the rectangular area A along the direction X is 98.6 mm; by adding the adjacent dense track areas, three new areas (area B1, area C and area B2) are obtained, L B1 1.0mm, L B2 1.1mm, L C 0.9mm;

[0088] According to the judgment rules, because L g >1.02L g *, so it is determined that the fork stroke is too large or the yarn tension is too small, which matches the actual working condition of adjusting the winding tension to 11 cN. This shows that the above method for judging the operating condition of the fork can accurately identify the track width abnormality caused by yarn tension adjustment, verifying the accuracy of the above method.

[0089] Example 4

[0090] An abnormal fork with a missing sharp corner of the fork blade was selected. The missing sharp corner length of the fork blade was measured to be 1.5 mm. The fork was installed on the second spindle position of a certain machine and then spun for production (L g * is 84.5mm), during the spinning process, the operating status of the shift fork is analyzed in real time according to the above method for judging the operating status of the shift fork;

[0091] The spinning process parameters are as follows: product specification 55dtex / 36f, winding speed 5270m / min;

[0092] The shift fork's operating speed at a certain moment during the machine's operation was 2979 cpm. Based on the shift fork's operating speed at that moment, the camera's exposure time was set to 0.060 s, and an image of the trajectory of the single yarn in the second spindle making three reciprocating motions was obtained.

[0093] The running trajectory image processing parameters are: D a D A 8 times, D ais 1500 times of W, L is 300 times of W, and the rectangular area A is divided into 200 sub-areas along the direction X;

[0094] The parameters obtained by image analysis are as follows: the length Lg of the yarn running track area in the rectangular area A along the direction X is 81.9 mm; by adding the adjacent dense track areas, three new areas (area B1, area C and area B2) are obtained, L B1 0.8mm, L B2 2.6mm, L C 0.8mm;

[0095] According to the judgment rules, because L B2 Not less than 0.02L g , and L g <0.98L g *, so it is determined that the shift fork limit is abnormal and the shift fork is not shifted, which matches the actual fault of the shift fork blade missing 1.5mm sharp corner, indicating that the above method of judging the operating status of the shift fork can accurately identify the complex abnormalities caused by damage to the shift fork blade, verifying the accuracy of the above method.

Claims

1. A method for judging the operating condition of a shift fork, characterized in that: The following steps are involved: (1) During the operation of the winding machine, the trajectory image of a single yarn between the wire guide hook and the fork forming plate is collected for n round trip movements, where n is a positive integer less than 4; The forward or reverse direction of the yarn is recorded as direction X; (2) Cut out the rectangular area A from the running trajectory image; A set of opposite sides of the rectangular area A is parallel to the direction X. The main part of the set of opposite sides is located in the running track area in the running track image, with both ends exposed therefrom. The length of the set of opposite sides is L, and the length of the other set of opposite sides is W. In the running trajectory image, the distance from the guide wire hook to the fork forming plate is D a , the distance from the rectangular area A to the fork forming plate is D A , D a D A 5-10 times; The length of the running track area in the rectangular area A along the direction X is L g ; (3) Divide the rectangular area A into m sub-areas along the direction X, where the value of m ranges from 100 to 250. Calculate the percentage of pixels of the running trajectory in each sub-area, TDI. The sub-area with TDI higher than the average value is determined as a dense trajectory area, and the other sub-areas are determined as non-dense trajectory areas. (4) Add the adjacent dense trajectory areas to obtain at least three new areas, namely area B1, area C and area B2. Area B1 is close to the left end of the rectangular area A and its length along the direction X is L. B1 , area B2 is close to the right end of rectangular area A and its length along direction X is L B2 , area C is located in the middle of rectangular area A; (5) Judgment; According to the number of new regions, L B1 , L B2 , L g Determine the operating status of the shift fork.

2. A method for judging the operating condition of a shift fork according to claim 1, characterized in that: In step (1), an image acquisition device is used to collect the running trajectory image; The image acquisition device includes a camera and a flash light; The preset focal length of the camera is the distance between the camera and the yarn, the fork running speed is 2000-3000 cpm, and the exposure time of the camera is 0.02-0.1s; During the shooting process, the yarn is highlighted by the flash and the background is darkened; The periodic interval for collecting running trajectory images is 30-60 minutes.

3. A method for judging the operating condition of a shift fork according to claim 2, characterized in that: The camera shoots from inside the winding machine.

4. A method for judging the operating condition of a shift fork according to claim 2, characterized in that: The image acquisition device also includes a drive motor and a guide rail; the guide rail is parallel to the direction X, and the drive motor is used to drive the camera and flash to move along the guide rail to measure the operating conditions of different spindle position forks in the same machine.

5. The method for judging the operating condition of a shift fork according to claim 1, characterized in that: In step (1), the process of a single reciprocating motion is as follows: driven by the paddle, the yarn moves along the paddle forming plate from the conversion point on the left slack guide to the conversion point on the right slack guide, and then returns to the conversion point on the left slack guide.

6. A method for judging the operating condition of a shift fork according to claim 1, characterized in that: In step (2), L is 300-500 times W, D a It is 1500-2000 times that of W.

7. The method for judging the operating condition of a shift fork according to claim 1, characterized in that: In step (5), according to the number of new regions, L B1 , L B2 , L g Judging the operation status of the shift fork is: when L B1 or L B2 Not less than 0.02L g When , it is determined that the shift fork limit is abnormal; When there are other new areas in the middle of the rectangular area A in addition to area C, it is determined that the fork forming plate or fork blade is damaged; When L g <0.98L g *, it is determined that the shift fork is not shifted, where L g * is the L detected within one consecutive day during the production process of the shift fork without abnormal operation g The average value of When L g >1.02L g *, it is judged that the fork stroke is too large or the yarn tension is too small.

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