A method for judging the operating condition of a shift fork

Abstract

This invention belongs to the field of spinning technology and relates to a method for judging the running status of a shift fork. Specifically, it involves: acquiring an image of the running trajectory of a single yarn moving n times back and forth between the guide hook and the shift fork forming plate; extracting a rectangular region A from the image; dividing rectangular region A into m sub-regions along the X direction; calculating the pixel count ratio (TDI) of the running trajectory in each sub-region; identifying sub-regions with a TDI higher than the average value as dense trajectory regions and other sub-regions as non-dense trajectory regions; and adding adjacent dense trajectory regions to obtain at least three new regions, namely region B1, region C, and region B2, where region B1 has a length L along the X direction. B1 The length of region B2 along direction X is L. B2 Region C is located in the middle of rectangular region A. Based on the number of new regions and L... B1 , L B2 , L g Determine the operating status of the shift fork. This invention can determine the operating status of the shift fork by acquiring images of the yarn's trajectory, and can promptly detect any problems with the shift fork.

Description

Technical Field

[0001] This invention belongs to the field of spinning technology and relates to a method for judging the operating status of a shift fork. Background Technology

[0002] In the chemical fiber production process, after the yarn undergoes setting, it needs to be wound into a package using a winding machine. Currently, most mainstream winding equipment uses a shift fork mechanism to drive the yarn in a reciprocating motion to achieve the winding process. However, as a high-speed, precision component, even minor faults or damage to the shift fork are extremely difficult to detect during equipment operation. Such hidden dangers not only directly affect product quality, but also often result in a batch of abnormal yarn packages flowing into subsequent processes by the time the problem is exposed, causing significant losses to downstream users.

[0003] Despite significant technological advancements in the overall winding equipment, the core structure of the shift fork mechanism remains a traditional design—consisting of a shift fork forming plate 1 and two relatively rotating shift plates 2 (Y-shaped), working in conjunction with the left relaxation guide 3 and the right relaxation guide 4 (e.g., Figure 8 As shown in the diagram, the yarn 5 is driven by the lever 2 to reciprocate along the edge of the lever forming plate 1 to achieve uniform winding. In actual production, damage to the lever forming plate can cause yarn fraying, resulting in fuzzy yarn on the winding surface of the yarn cake; damage to the ceramic parts of the lever blades can easily cause yarn scratches, resulting in fuzzy yarn or continuous breakage; and deviation in the lever's limiting position can not only lead to abnormal winding shape of the yarn cake, but may also cause serious quality defects such as "ant spots" during the yarn dyeing process.

[0004] Currently, shift fork quality inspection still relies primarily on manual checks after machine shutdown. This method is limited by the professional capabilities of inspectors, resulting in a high risk of missed detections. Furthermore, the long inspection cycle makes it difficult to intercept abnormal products in real time, posing risks to the company and its downstream supply chain. In the field of dynamic detection technology, existing methods that determine shift fork limit differences by measuring the temperature at both ends of the wire cake are not directly related to mechanical damage to the shift fork (such as defects in the shift fork forming plate or wear on the shift blade). They can only indirectly reflect some mechanical problems and are easily affected by environmental factors, leading to insufficient accuracy. They also cannot cover the diverse types of faults in shift fork components and cannot 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 in order to solve the above problems. Summary of the Invention

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

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

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

[0009] (1) During the operation of the winding machine, the trajectory image of a single yarn moving back and forth n times between the guide hook and the fork forming plate is collected. n should not be too large, otherwise the dense trajectory area cannot be distinguished in the later stage. n is a positive integer less than 4.

[0010] The direction of the yarn's forward or backward movement is denoted as direction X;

[0011] (2) Extract a rectangular region A from the trajectory image;

[0012] A pair of opposite sides of rectangular region A are parallel to direction X (i.e., the direction of the line connecting the transition point on the left relaxation guide wire and the transition point on the right relaxation guide wire). The main body of this pair of opposite sides is located within the running trajectory area in the running trajectory image, with both ends protruding from it. The length of this pair of opposite sides is L, and the length of the other pair of opposite sides is W.

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

[0014] The length of the trajectory region located within the rectangular region A along the X direction is L. g ;

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

[0016] (4) Add the adjacent dense trajectory regions together to obtain at least three new regions, namely region B1, region C and region B2. Region B1 is close to the left end of rectangular region A and has a length of L along the direction X. B1 Region B2 is located near the right end of rectangular region A and has a length of L along the direction X. B2 Region C is located in the middle of rectangular region A;

[0017] (5) Judgment;

[0018] Based on the number of new areas, L B1 L B2 L g Determine the operating status of the shift fork.

[0019] As a preferred technical solution:

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

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

[0022] The camera's preset focal length is the distance between the camera and the yarn. The camera's exposure time is set according to the speed of the fork at the shooting time. The fork's speed is 2000-3000 cpm (driving the yarn back and forth about 30-50 times / s), and the camera's exposure time is 0.02-0.1s. The fork's speed and the exposure time work together to determine how many times the yarn goes back and forth in the trajectory image.

[0023] During the shooting process, a flash was used to highlight the yarn and the background was darkened to make it easier to distinguish the density of the yarn's movement trajectory.

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

[0025] As described above, in one method for judging the operating status of the shift fork, the camera shoots outward from inside the winding machine. This ensures that, under certain focal length and supplementary lighting, the background of the image of the running trajectory is black, and the running trajectory of the yarn is white.

[0026] As described above, the method for judging the operating status of the shift fork includes an image acquisition device that also includes a drive motor and a guide rail. The guide rail is parallel to the X direction, and the drive motor is used to drive the camera and flash to move along the guide rail to measure the operating status of the shift forks at different spindle positions within the same machine (a machine typically produces 12-16 spindles of yarn at the same time, each spindle of yarn corresponds to one shift fork, and the shift forks are independent of each other. Generally, when a shift fork malfunctions, it is only one of the spindle shift forks that is malfunctioning. Therefore, the image acquisition device needs to be moved to measure the operating status of the shift forks at different spindle positions).

[0027] As described above, in a method for judging the operating status of the shift fork, in step (1), the process of a single reciprocating motion is as follows: the yarn moves along the shift fork forming plate from the conversion point on the left relaxation guide to the conversion point on the right relaxation guide under the drive of the shift plate, and then returns to the conversion point on the left relaxation guide.

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

[0029] As described above, in a method for judging the operating status of a shift fork, step (5) involves determining the number of new areas and L. B1 L B2 Lg Judging the operating status of the shift fork refers to: when L B1 or L B2 Not less than 0.02L g When this occurs, it is determined that the fork limit is abnormal;

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

[0031] When L g <0.98L g When * occurs, it is determined that the shift fork is not disengaged, where L g *Refers to L detected within one consecutive day during a production process where the shift fork is operating abnormally without any faults. g The average value of the shift fork is used to check whether the shift fork is in good condition. The yarn tension value is measured to be within the process range. After the check is confirmed, the Lg test is manually started and tested continuously for 1 day to obtain the average value of Lg*.

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

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

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

[0035] When the fork operates abnormally, such as when there is a deviation in the relative limit between the two forks (denoted as fork A and fork B), the yarn will reach one end of the forming plate under the action of fork A, but fork B will fail to reach that position. The yarn cannot return immediately under the action of fork B, resulting in a longer pause time for the yarn at that point and the appearance of dense tracks.

[0036] When the fork forming plate or the fork blade is damaged, the yarn experiences increased friction when passing through the damaged point, and the yarn pauses at that point for a longer period of time, resulting in a dense track.

[0037] If the shift fork is not moved out or the stroke is too large, the width of the yarn's running track at the fixed position will become smaller or larger. When the tension is too small, the yarn will vibrate more between the guide hook and the shift fork, forming an arc shape on both sides, which will increase the width of the yarn's running track at the fixed position.

[0038] Beneficial effects

[0039] The present invention provides a method for judging the operating status of a shift fork. By acquiring the running trajectory of the yarn as it passes between the guide hook and the shift fork forming plate using an image acquisition device, the method can determine whether there is any abnormality in the operating status of the shift fork. This method can effectively avoid defects in subsequent products caused by shift fork limiting (such as ant spots in dyeing) and yarn fuzz caused by damage to the shift fork forming plate or shift fork blades.

[0040] The present invention provides a method for judging the operating status of a shift fork, which can periodically acquire images of the yarn running trajectory to monitor the long-term operating status of the shift fork and ensure the quality of the produced products. Attached Figure Description

[0041] Figure 1 This diagram illustrates the movement trajectory of a single yarn and the division of abnormal judgment areas during normal operation of the shift fork. The yarn has a narrow and dense trajectory in the turning areas on both the left and right sides.

[0042] Figure 2 This is a schematic diagram of the movement trajectory of a single yarn and the distribution of dense areas when the fork limiter malfunctions, corresponding to Example 1;

[0043] Figure 3 This is a 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 This is a schematic diagram showing the abnormal movement trajectory and width of a single yarn when the yarn tension is too low, corresponding to Example 3;

[0045] Figure 5 Divide the rectangular region A into equal subregions and define L, W, and L'. g Dimensional diagram;

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

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

[0048] Figure 8 This is a schematic diagram of the shift fork mechanism;

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

[0050] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0051] A method for determining the operating status of a shift fork, with the following specific steps:

[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 direction X (the direction of the yarn’s forward or backward movement is called direction X), and the drive motor is used to drive the camera and flash to move along the guide rail to measure the operating status of the shift forks at different spindle positions in 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 acquire the trajectory image of a single yarn 5 located between the guide hook 6 and the fork forming plate 1 as it makes n reciprocating movements (the process of a single reciprocating movement is: the yarn 5 moves along the fork forming plate 1 from the conversion point 8 on the left relaxation guide 3 to the conversion point 9 on the right relaxation guide 4 under the drive of the fork 2, and then returns to the conversion point 8 on the left relaxation guide 3), where n is a positive integer less than 4;

[0055] Specific parameter settings: The camera's preset focal length is the distance between the camera and yarn 5; the fork's operating speed is 2000-3000 cpm; the camera's exposure time is 0.02-0.1 s; during shooting, use a flash to supplement light to highlight yarn 5 and darken the background (e.g., Figure 7 As shown, the camera of the image acquisition device 10 captures images from inside the winding machine (the period interval for acquiring images of the running trajectory is 30-60 minutes).

[0056] (2) Extract a rectangular region A7 from the trajectory image;

[0057] A pair of opposite sides of rectangular region A 7 are parallel to direction X. The main body of this pair of opposite sides is located within the trajectory area in the trajectory image, with both ends protruding from it. The length of this pair of opposite sides is L, and the length of another pair of opposite sides is W. L is 300-500 times W.

[0058] In the trajectory image, the distance from guide wire hook 6 to shift fork forming plate 1 is D. a The distance from rectangular region A7 to the fork forming plate 1 is D. A , D a D A 5-10 times that of Da It is 1500-2000 times that of W;

[0059] The length of the trajectory region located within the rectangular area A7 along the X direction is L. g (L, W, L) g Size such as Figure 5 (as shown)

[0060] (3) Divide the rectangular region A7 into m sub-regions along the direction X, where m ranges from 100 to 250 (e.g., ...). Figure 5 As shown in the figure, the pixel count ratio (TDI) of the running trajectory in each sub-region is calculated. Sub-regions with TDI higher than the average value are identified as dense trajectory regions, and other sub-regions are identified as non-dense trajectory regions.

[0061] (4) Add the adjacent dense trajectory regions together to obtain at least three new regions, namely region B1, region C and region B2. Region B1 is close to the left end of rectangular region A7 and has a length of L along the direction X. B1 Region B2 is located near the right end of rectangular region A7 and has a length of L along the X direction. B2 Region C is located in the middle of rectangular region A7 and has a length of L along the X direction. C (L) B1 L B2 L C Size such as Figure 6 (as shown)

[0062] (5) Judgment;

[0063] Based on the number of new areas, L B1 L B2 L g To determine the operating status of the shift fork, the following steps are taken:

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

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

[0066] When L g <0.98L g When * occurs, it is determined that the shift fork is not disengaged, where L g *Refers to L detected within one consecutive day during a production process where the shift fork is operating abnormally without any faults. g The average value;

[0067] When L g >1.02Lg * If the fork travel is too large, or the yarn tension is too low, it is determined that the fork travel is too large or the yarn tension is too low.

[0068] Example 1

[0069] Select a fork with abnormal limit position, and measure the limit deviation between the fork blades to be 4mm. Then install it on the machine at the 11th spindle position and carry out spinning production. During the spinning process, the operating status of the fork is analyzed in real time according to the above method for judging the operating status of the fork.

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

[0071] At a certain moment during the machine's operation, the fork's operating speed was 2784 cpm. Based on this speed, the camera's exposure time was set to 0.043 s, resulting in an image of the trajectory of the 11th spindle's single yarn undergoing two reciprocating motions (e.g., ...). Figure 2 (as shown)

[0072] The parameters for processing the trajectory image are: D a D A 10 times that, D a The rectangular region A is 1800 times the size of W, and L is 500 times the size of W. The rectangular region A is divided into 250 sub-regions along the direction X.

[0073] Image analysis yielded the following parameters: the length Lg of the yarn's trajectory within rectangular region A along direction X is 88.2 mm; by adding adjacent dense trajectory regions, three new regions (region B1, region C, and region B2) were obtained, L... B1 It is 5.1mm, L B2 It is 0.9mm, L C It is 0.8mm;

[0074] According to the judgment rule, because L B1 Not less than 0.02L g Therefore, it was determined that the shift fork limit was abnormal, indicating that the above method for judging the operation 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] Select a fork with a damaged fork forming plate. Measure the distance of the defect on the fork forming plate along the X direction from the right relaxation guide to 17mm and the width of the defect to 1mm. Install it on the machine at the 10th spindle position and carry out spinning production. During the spinning process, analyze the fork's operating status in real time according to the above method for judging the fork's operating status.

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

[0078] At a certain moment during the machine's operation, the fork's running speed was 2592 cpm. Based on this speed, the camera's exposure time was set to 0.046 s, resulting in an image of the trajectory of the 10th spindle's single yarn undergoing two reciprocating motions (e.g., ...). Figure 3 (as shown)

[0079] The parameters for processing the trajectory image are: D a D A 5 times, D a The length of the rectangle A is 2000 times that of W, and the length of the rectangle A is 400 times that of W. The rectangle A is divided into 100 sub-regions along the direction X.

[0080] Image analysis yielded the following parameters: the length Lg of the yarn's trajectory within rectangular region A along direction X is 70.9 mm; by adding adjacent dense trajectory regions, four new regions were obtained (region B1, region C, region B2, and region D, with region D located in the middle of rectangular region A and between region B1 and region C, and its length Lg along direction X is denoted as Lg). D ), L B1 It is 0.8mm, L B2 It is 0.9mm, L C It is 0.7mm, L D It is 1.6mm;

[0081] According to the judgment rules, since there is area D other than areas B1, B2, and C, it is determined to be damage to the shift fork forming plate or the shift fork blade. This matches the defect fault on the actual shift fork forming plate, which is 17mm away from the right relaxation guide and 1mm wide along the X direction. This shows that the above method for judging the operation status of the shift fork can accurately identify defect-type damage to the shift fork forming plate and can locate the damage location through trajectory anomalies, thus verifying the accuracy of the above method.

[0082] Example 3

[0083] Select a spinning machine that is operating normally during the spinning process, and reduce the yarn tension by adjusting it (the initial average winding tension was measured to be 16 cN, L). g * is 90.0 mm), and based on the above method for judging the operation status of the shift fork, the operation status of the shift fork during the spinning process is analyzed in real time;

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

[0085] At a certain moment during the machine's operation, the fork's running speed was 2187 cpm. Based on this speed, the camera's exposure time was set to 0.055 s, resulting in an image of the trajectory of the 5th spindle's single yarn undergoing two reciprocating motions (e.g., ...). Figure 4 (as shown)

[0086] The parameters for processing the trajectory image are: D a D A 10 times that, D a The rectangular region A is 1500 times the size of W, and L is 500 times the size of W. The rectangular region A is divided into 250 sub-regions along the direction X.

[0087] Image analysis yielded the following parameters: the length Lg of the yarn's trajectory within rectangular region A along direction X is 98.6 mm; by adding adjacent dense trajectory regions, three new regions (region B1, region C, and region B2) were obtained, L... B1 It is 1.0mm, L B2 It is 1.1mm, L C It is 0.9mm;

[0088] According to the judgment rule, because L g >1.02L g Therefore, it was determined that the fork travel was too large or the yarn tension was too small, which matched the actual working condition of adjusting the winding tension to 11cN. This shows that the above method for judging the operating status of the fork can accurately identify the abnormal trajectory width caused by the adjustment of yarn tension, and verifies the accuracy of the above method.

[0089] Example 4

[0090] An abnormal shift fork with a missing sharp corner was selected. The length of the missing sharp corner was measured to be 1.5 mm. This fork was then installed on the second spindle of a certain machine for spinning production (L). g *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: the product specification is 55dtex / 36f, and the winding speed is 5270m / min.

[0092] The speed of the shift fork at a certain moment during the operation of the machine is 2979 cpm. Based on the speed of the shift fork at this moment, the exposure time of the camera is set to 0.060s, and the trajectory image of the second spindle single yarn making 3 round trips is obtained.

[0093] The parameters for processing the trajectory image are: D a D A 8 times that of D aThe rectangle A is 1500 times the size of W, and L is 300 times the size of W. The rectangular region A is divided into 200 sub-regions along the direction X.

[0094] Image analysis yielded the following parameters: the length Lg of the yarn's trajectory within rectangular region A along direction X is 81.9 mm; by adding adjacent dense trajectory regions, three new regions (region B1, region C, and region B2) were obtained, L... B1 It is 0.8mm, L B2 It is 2.6mm, L C It is 0.8mm;

[0095] According to the judgment rule, because L B2 Not less than 0.02L g And L g <0.98L g Therefore, it was determined that the shift fork limit was abnormal and the shift fork was not disengaged. This matched the actual fault of the shift fork blade missing a 1.5mm sharp corner, indicating that the above method for judging the operation of the shift fork can accurately identify the complex abnormality caused by damage to the shift fork blade, and verified the accuracy of the above method.

Claims

1. A method for judging the operating status of a shift fork, characterized in that, Includes the following steps: (1) During the operation of the winding machine, the trajectory image of a single yarn moving back and forth n times between the guide hook and the fork forming plate is collected, where n is a positive integer less than 4; The direction of the yarn's forward or backward movement is denoted as direction X; (2) Extract a rectangular region A from the trajectory image; A pair of opposite sides of a rectangular region A are parallel to the direction X. The main body of this pair of opposite sides is located within the trajectory area in the trajectory image, with both ends protruding from it. The length of this pair of opposite sides is L, and the length of the other pair of opposite sides is W. In the trajectory image, the distance from the guide wire hook to the fork forming plate is D. a The distance from rectangular region A to the fork forming plate is D. A , D a D A 5-10 times; The length of the trajectory region located within the rectangular region A along the X direction is L. g ; (3) Divide the rectangular area A into m sub-regions along the direction X, where m ranges from 100 to 250. Calculate the percentage of pixels (TDI) of the running trajectory in each sub-region. Sub-regions with TDI higher than the average value are identified as dense trajectory areas, while other sub-regions are identified as non-dense trajectory areas. (4) Add the adjacent dense trajectory regions together to obtain at least three new regions, namely region B1, region C and region B2. Region B1 is close to the left end of rectangular region A and has a length of L along the direction X. B1 Region B2 is located near the right end of rectangular region A and has a length of L along the direction X. B2 Region C is located in the middle of rectangular region A; (5) Judgment; Based on the number of new areas, L B1 L B2 L g Determine the operating status of the shift fork.

2. The method for determining the operating status of a shift fork according to claim 1, characterized in that, In step (1), an image acquisition device is used to collect images of the running trajectory; The image acquisition device includes a camera and a flash; The camera's preset focal length is the distance between the camera and the yarn, the fork's operating speed is 2000-3000 cpm, and the camera's exposure time is 0.02-0.1s. During the shoot, a flash was used to highlight the yarn and darken the background. The periodic interval for acquiring images of the running trajectory is 30-60 minutes.

3. The method for judging the operating status of a shift fork according to claim 2, characterized in that, The camera is shooting from inside the winding machine.

4. The method for judging the operating status 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 X direction, and the drive motor is used to drive the camera and flash to move along the guide rail to measure the operating status of the shift forks at different spindle positions within the same machine.

5. The method for determining the operating status of a shift fork according to claim 1, characterized in that, In step (1), the process of a single round trip is as follows: the yarn moves along the forming plate of the fork from the conversion point on the left relaxation guide to the conversion point on the right relaxation guide, and then returns to the conversion point on the left relaxation guide.

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

7. The method for determining the operating status of a shift fork according to claim 1, characterized in that, In step (5), based on the number of new regions and L B1 L B2 L g Judging the operating status of the shift fork refers to: when L B1 or L B2 Not less than 0.02L g When this occurs, it is determined that the fork limit is abnormal; When there are other new areas in the middle of rectangular area A besides area C, it is determined that the shift fork forming plate is damaged or the shift fork blade is damaged. When L g <0.98L g When * occurs, it is determined that the shift fork is not disengaged, where L g *Refers to L detected within one consecutive day during a production process where the shift fork is operating abnormally without any faults. g The average value; When L g >1.02L g * If the fork travel is too large or the yarn tension is too small, it is determined that the fork travel is too large or the yarn tension is too small.

Images