Method for improving the consistency of the length of a wire rope for a pull cord sensor

Abstract

The present application relates to a kind of methods for improving the consistency of long winding rope of pull rope sensor, the method comprises the following steps: 1) assemble the pull rope sensor product coil spring to be wound;2) assemble winding tool, and load the pull rope sensor product to be wound;3) start motor to complete automatic winding.The present application can greatly reduce the distance between binding port and fixed seat inlet by setting multiple uniformly distributed binding ports on winding wheel, directly reduce the inconsistency caused by the position of binding port, in addition, multiple outer hook installation grooves are set on the inner wall of fixed seat, the pre-tightening force of coil spring is controlled within a smaller extent, and the winding tightness of flexible cable is controlled, which can effectively improve the calibration detection precision.

Description

Technical Field

[0001] This invention relates to the field of sensor device testing, and in particular to a method for improving the consistency of the winding rope length of a pull-rope sensor. Background Technology

[0002] A pull-cord sensor, also known as a pull-cord displacement sensor, pull-wire sensor, pull-cord electronic ruler, or pull-cord encoder, is a precision length measuring device that uses a flexible cable, a spring-loaded drum, and a sensor to accurately measure linear position. Its travel range can vary from several hundred millimeters to tens of meters. The length of the flexible cable significantly affects the sensor's range, travel, and accuracy; therefore, ensuring consistent cable length is crucial in actual production.

[0003] The consistency of rope length and measurement accuracy of a pull-rope sensor are related to its product structure and manufacturing process. The pull-rope sensor's structure includes a base, a coil spring, a rotating shaft, and a winding wheel. The winding wheel is mounted on the rotating shaft and has a binding slot. The inner hook of the coil spring is engaged with the winding wheel via a mounting slot, while the outer hook is engaged with the mounting base via a mounting slot.

[0004] Currently, the automated production process for winding involves connecting the motor and the pull rope sensor shaft via a coupling, using an automatic winding method. However, this process is affected by the manufacturing process of the coil spring on the pull rope sensor. Figure 1 As shown, even within the same batch of coil springs, the relative positions of the inner and outer hooks are not consistent. This results in variations in the position of the binding hole on the winding reel after the shaft is aligned with the motor's zero position. Although the products are installed in the same location, the inconsistent positions of the binding holes, coupled with the same number of motor rotations, lead to inconsistent cable lengths being wound in, affecting product performance. Furthermore, the coil springs may experience pre-tensioning during the alignment process, increasing the pre-tension force and causing excessively tight winding. This, in turn, affects the coil spring's lifespan and the accuracy of subsequent flexible cable calibration processes.

[0005] Therefore, a new method is needed to improve the consistency of rope length in pull-wire sensors in order to solve the problems mentioned in the background art. Summary of the Invention

[0006] To address the technical problems in the background art, the present invention provides a method for improving the consistency of the winding rope length of a pull rope sensor, the method comprising the following steps:

[0007] 1) Assemble the coil spring of the pull rope sensor product to be wound;

[0008] 2) Assemble the winding fixture and load the pull rope sensor product to be wound;

[0009] 3) Start the motor to complete the automatic winding.

[0010] Preferably, the pull rope sensor product includes a fixed base, a winding wheel, a rotating shaft, a coil spring rotating sleeve, and a coil spring. The fixed base has a winding wheel mounting chamber on one side for mounting the winding wheel, and a coil spring mounting chamber on the other side for mounting the coil spring. The rotating shaft passes through the center holes of the winding wheel and the fixed base in sequence and then mounts the coil spring rotating sleeve. The inner hook of the coil spring is engaged and fixed with the inner hook mounting groove of the coil spring rotating sleeve, and the outer hook is engaged and fixed with the outer hook mounting groove on the inner wall of the coil spring mounting chamber. The coil spring is tightened and loosened under the drive of the rotating shaft.

[0011] Preferably, multiple binding holes are opened at equal intervals along the circumferential direction on the side wall of the winding wheel.

[0012] Preferably, the number of binding holes N ≥ 10, and the angle range covered by each binding hole is...

[0013] Preferably, multiple external hook mounting slots are provided at equal intervals along the circumferential direction on the inner wall of the coil spring mounting chamber.

[0014] Preferably, the number of external hook mounting slots M≥15, and M≥N.

[0015] Preferably, step 1) specifically includes the following steps:

[0016] 11) Install the coil spring rotating sleeve on the rotating shaft, and engage and fix the inner hook of the coil spring with the inner hook mounting slot on the coil spring rotating sleeve;

[0017] 12) Rotate the flat end of the shaft in the corresponding direction and hold it in the set position, i.e., the motor zero position;

[0018] 13) Place the coil spring with the inner hook fixed in its natural state in the coil spring mounting compartment of the fixed seat, and engage and fix the outer hook of the coil spring with the nearest outer hook mounting slot.

[0019] Preferably, the winding fixture includes a base plate, a motor bracket fixed on the base plate, a motor mounted on the motor bracket, a motor bushing, a connecting shaft sleeve, and a product bushing. The motor bushing is a cylindrical sleeve with two symmetrically distributed sliding grooves on its cylindrical surface. The upper end of the motor bushing has a flat opening and is fixedly connected to the output shaft of the motor. The connecting shaft sleeve is inserted into the lower flat opening of the motor bushing. Pins are installed on the left and right side walls of the connecting shaft sleeve. The pins slide up and down and are limited within the sliding grooves of the motor bushing. The lower end of the product bushing has a flat groove and is connected to a rotating shaft. A shoulder is provided in the middle, and the upper end is a flat shaft that matches the shape of the lower end of the connecting shaft sleeve.

[0020] Preferably, step 2) specifically includes the following steps:

[0021] 21) Fix the motor by connecting the motor's output shaft to the flat slot on the motor shaft sleeve and tightening it with nut screws;

[0022] 22) Control the motor to rotate, causing the motor bushing to rotate, so that the flat end faces the set position;

[0023] 23) Secure the lower end of the product bushing to the rotating shaft using a flat mounting method;

[0024] 24) Slide the connecting cylinder upward along the motor shaft sleeve to install the rope sensor product into the mounting position on the base plate and fix it;

[0025] 25) Rotate the shaft to the set position so that the shaft is aligned with the output shaft of the motor.

[0026] 26) After alignment, the sleeve will automatically fall due to gravity, thus achieving alignment and connection between the rotating shaft and the motor output shaft.

[0027] Preferably, step 3) specifically includes the following steps:

[0028] 41) Determine the number of rotations T of the motor required based on the range of the pull rope sensor product to be wound, start and control the motor to rotate to the set number of rotations and then stop to complete the spring tightening process.

[0029] 42) After the coil spring is tightened, fix one end of the flexible cable at the binding hole closest to the set position;

[0030] 43) Start the motor and rotate it in the opposite direction according to the set number of reverse rotations P. During the reverse rotation, the flexible cable is wound onto the winding wheel.

[0031] 44) Slide the connecting shaft cylinder upwards to separate the lower end of the connecting shaft cylinder from the product bushing. Remove the pull rope sensor product to be wound, and then remove the product bushing to complete the winding process.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. Good consistency in line length:

[0034] This invention, by setting multiple evenly distributed binding holes on the winding reel, allows for direct selection of the binding hole closest to the motor's zero position during winding, thereby reducing the distance between the binding hole and the motor's zero position to a minimum. Compared to existing winding reels with only one fixed wire-binding port, the new reel significantly reduces the distance between the wire-binding port and the wire inlet of the fixed seat, directly reducing inconsistencies caused by the position of the wire-binding port.

[0035] II. Improve accuracy

[0036] This invention, by setting multiple external hook mounting slots, allows the coil spring to remain in a near-natural state during installation, maintaining consistent relative positions of its inner and outer hooks. This eliminates the need for significant shaft rotation and additional preload to the coil spring when aligning the shaft with the motor's zero position. In traditional methods, this preload could reach a full turn, leading to an overly tight coil spring during subsequent calibration, causing the cable to be closer to the winding reel and affecting the length of each turn, thus impacting accuracy. This invention significantly reduces the additional preload, to a maximum of only [amount missing]. The coil is controllable, and the tightness of the flexible cable winding can be controlled by adjusting the preload of the coil spring within a reasonable range, thus improving accuracy.

[0037] III. Specific solutions can be selected based on needs.

[0038] In this invention, the structural improvements, tooling improvements, and process improvements used to improve the consistency of the pull rope sensor line length each have slightly different focuses. Increasing the number of binding holes reduces unnecessary excess winding, thus improving winding consistency. Increasing the number of external hook mounting slots allows the coil spring to be in a natural state, reducing the inconsistency of the coil spring's preload before winding, resulting in more uniform winding. This ensures winding consistency while effectively improving calibration accuracy. Improving the winding tooling allows the flat part of the rotating shaft to be aligned with the motor's zero position without requiring extensive rotational alignment, while also ensuring synchronous rotation of the motor shaft and the rotating shaft, thereby guaranteeing winding consistency. It is evident that these three improvements can be implemented separately or in combination. Different improvement methods can be selected to achieve different technical effects depending on the specific situation. Attached Figure Description

[0039] Figure 1 This is a schematic diagram illustrating the relative positional difference between the inner and outer hooks of a coil spring.

[0040] Figure 2 Figure 2a shows a schematic diagram comparing the wire binding port structure of the winding wheel for the pull rope sensor. Figure 2b shows a schematic diagram of the existing wire binding port structure of the winding wheel before improvement, and Figure 2a shows a schematic diagram of the improved wire binding port structure of the winding wheel of the present invention.

[0041] Figure 3 Figure 3a shows a schematic diagram of the existing hook mounting slot structure for the pull-rope sensor base before improvement, and Figure 3b shows a schematic diagram of the improved hook mounting slot structure for the pull-rope sensor base of the present invention.

[0042] Figure 4 A schematic diagram of the tooling used to manufacture the rope sensor.

[0043] Figure 5 This is a schematic diagram of the sleeve assembly.

[0044] Figure 6 A schematic diagram of the tooling used in the production of the pull-rope sensor.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Shaft, 2. Winding wheel, 21. Binding port, 3. Fixing base, 31. Outer hook mounting slot, 32. Outlet, 4. Coil spring rotating sleeve, 41. Inner hook mounting slot, 6. Coil spring, 61. Outer hook, 62. Inner hook, 7. Product, 8. Base plate, 9. Motor bracket, 10. Motor, 11. Motor bushing, 12. Connecting shaft sleeve, 13. Product bushing. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0048] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0049] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product 7 is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0050] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0051] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0052] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0053] To address the aforementioned issues, this invention provides a method for improving the consistency of the winding length of a pull-cord sensor, which not only ensures the consistency of the winding length of the pull-cord sensor product 7 but also improves the calibration and measurement accuracy of the pull-cord sensor.

[0054] like Figure 2 As shown in Figure a, the existing pull rope sensor structure includes a fixed base 3, a winding wheel 2, a rotating shaft 1, a coil spring rotating sleeve 4, and a coil spring 6. The fixed base 3 has a winding wheel mounting chamber on one side for mounting the winding wheel 2, and a wire outlet 32 ​​communicating with the winding wheel mounting chamber. The other side has a coil spring mounting chamber for mounting the coil spring 6. The rotating shaft 1 is installed on the center hole of the winding wheel 2 and the fixed base 3 and fitted with the coil spring rotating sleeve 4. The inner hook 62 of the coil spring 6 is engaged and fixed with the inner hook mounting slot 41, and the outer hook 61 is engaged and fixed with the outer hook mounting slot 31. There is only one outer hook mounting slot 31, and its position is fixed relative to the wire outlet 32. When calculating the winding length, the distance between the wire outlet 32 ​​and the binding port 21 needs to be considered, which is also the main reason for the inconsistent length.

[0055] like Figure 2 As shown in b, this invention modifies the structure of the winding wheel 2 of the existing pull rope sensor, allowing the position of the binding port 21 to be selected during winding. This is mainly achieved by increasing the number of binding ports 21 on the winding wheel 2 of the pull rope sensor. For example, at least N (N≥10) binding ports 21 are evenly opened along the circumference of the winding wheel 2, preferably 10-12. The angle range covered by each binding port 21 is... The more wire-binding ports 21 there are, the smaller the angle range covered by each wire-binding port 21. Therefore, during the process of adjusting the rotating shaft 1 to be directly aligned with the set position (motor zero position), the distance between the wire inlet and the wire-binding port 21 fixed on the mounting base 3 will be shortened. Within the arc length range; during production, the binding port 21 closest to the motor zero position (set position) is used for binding, ensuring that the difference in wire length between each pull rope sensor does not exceed [the specified range]. This effectively improves the consistency of the cable length in pull-cord sensors, thereby ensuring that the flexible cable length error of each pull-cord sensor product is within a certain range. Inside.

[0056] like Figure 3 As shown in Figure a, in the existing structure of the pull rope sensor fixing seat 3, there is only one outer hook mounting slot 31 on the side wall of the coil spring mounting chamber. The relative position of the outer hook mounting slot 31 and the outlet 32 ​​is also fixed. Therefore, for the coil spring 6 in different natural states, the position of its outer hook 61 is fixed, while the position of the inner hook 62 is random. This will increase the preload by no more than 1 turn during the subsequent adjustment of the zero position of the positive motor, which will affect the tightness of the winding.

[0057] like Figure 3 As shown in b, the present invention changes the structure of the existing pull rope sensor fixing seat 3 so that the snapping position of the outer hook 61 of the coil spring 6 can be selected during production. This is mainly achieved by increasing the number of outer hook mounting slots 31 on the pull rope sensor base. For example, at least M (M≥15) outer hook mounting slots 31 are evenly arranged circumferentially on the inner wall of the fixing seat 3 of the pull rope sensor, preferably 15-20, and generally M≥N.

[0058] During the production process, when installing the coil spring 6, the inner hook is first fixed so that it engages with the inner hook mounting slot 41 on the coil spring rotating sleeve 4. The rotating shaft 1 is then rotated to the motor zero position (set position). When the coil spring 6 is in its natural state, the outer hook 61 of the coil spring 6 is fixed in the outer hook mounting slot 31 closest to its position. In this way, the consistency of the position of the rope sensor binding port 21 is greatly improved. Therefore, during automated production, the coil spring 6 is always in a near-natural state, thus keeping the preload of the coil spring 6 nearly consistent. Since the number of preload turns and release turns of the motor 10 are consistent, the consistency of the length of the flexible cable wound into the winding wheel 2 is further improved.

[0059] like Figure 4 and 5 As shown, this invention also improves the production process by designing a production fixture for the pull-rope sensor. This ensures that the output shaft of the motor 10 is in a set position when it starts to rotate, and also guarantees that the output shaft of the motor 10 rotates synchronously with the pull-rope sensor shaft 1, facilitating operation, reducing operational errors, and improving line length consistency. The fixture structure mainly consists of a base plate 8, a motor bracket 9, a motor 10, a motor bushing 11, a floating connecting shaft cylinder 12, and a product bushing 13. The motor bushing 11 is a cylindrical sleeve with two symmetrically distributed sliding grooves on its cylindrical surface. The upper end of the motor bushing 11 is fixedly connected to the output shaft of the motor 10 and rotates synchronously with the output shaft of the motor 10. The lower opening of the motor bushing 11 is flat, allowing insertion into the connecting shaft cylinder 12, and it can slide up and down inside the motor bushing 11. The outer contour of the connecting shaft cylinder 12 with a flat section matches the shape of the lower end of the motor bushing 11. The internal opening of the connecting shaft cylinder 12 is also a round hole with a flat section. Pins are installed on the left and right side walls of the connecting shaft cylinder 12. These pins slide up and down and are limited in the left and right sliding grooves of the motor bushing 11. The product bushing 13 is connected to the rotating shaft 1 of the pull rope sensor at one end with a flat groove and a shoulder in the middle. The other end is a flat shaft that matches the shape of the lower end of the connecting shaft cylinder 12.

[0060] In use, first, fix the upper end of the motor bushing 11 to the output shaft of the motor 10, and insert the connecting shaft cylinder 12 into the motor bushing 11 from the lower end. The pin hole on the connecting shaft cylinder 12 and the sliding groove on the motor bushing 11 are connected by a pin with a perforated shoulder, thus completing the assembly of the floating connecting shaft cylinder 12. At this time, the connecting shaft cylinder 12 can slide up and down relative to the motor bushing 11. Then, assemble the flat groove at the lower end of the product bushing 13 with the rotating shaft 1 (also flat) of the pull rope sensor. Finally, slide the connecting shaft cylinder 12 upward to provide installation space in the vertical direction. After fixing the pull rope sensor product 7 with the product bushing 13 on the mounting position of the base plate 8, slide the connecting shaft cylinder 12 down and connect it to the upper end of the product bushing 13, thus completing the preparation work for winding the pull rope sensor.

[0061] The motor bushing 11 and the connecting shaft cylinder 12 slide up and down to make room for the installation of product 7. The product bushing 13 and the connecting shaft cylinder 12 are clearance fit. After the motor 10 rotates, the two lock together to achieve transmission.

[0062] In summary, as Figure 6 As shown, combining the above improvements to the structure and manufacturing tooling of the pull-cord sensor product 7, the specific production steps of the method for improving the consistency of the winding rope length of the pull-cord sensor provided by this invention are as follows:

[0063] Example 1

[0064] This embodiment takes the production process of a pull-cord sensor with a measuring range of 8m and a winding length maintained within the range of 8.05±0.01m as an example to improve the consistency of winding length:

[0065] 1. Assemble the coil spring 6 of product 7, which is the pull rope sensor.

[0066] 11) Install the coil spring rotating sleeve 4 on the rotating shaft 1, and engage and fix the inner hook 62 of the coil spring 6 with the inner hook mounting slot 41 on the coil spring rotating sleeve 4;

[0067] 12) Keep the flat end of shaft 1 in the set position, i.e., the motor zero position;

[0068] 13) Place the coil spring 6 with the inner hook fixed in its natural state in the fixing base 3. At this time, select the outer hook mounting slot 31 that is closest to the outer hook 61 of the coil spring 6, and engage and fix the outer hook 61 with the outer hook mounting slot 31. At this time, the angle between the inner hook and the outer hook 61 of the coil spring 6 is approximately the natural original angle, and the angle difference is less than 1 / 3. When M is 15, the angle difference is less than 12°. Taking an 8m range rope sensor as an example, it requires 36 turns of coiled spring, with each turn about 250mm long. Therefore, the total difference in the winding length can be controlled within the range of 8.05±0.01m.

[0069] 2. Assembly fixtures

[0070] 21) After fixing the motor 10 with the motor bracket 9, connect the output shaft of the motor 10 to the flat groove on the motor bushing 11 and tighten it with a nut screw.

[0071] 22) Rotate the motor 10 to the set position, i.e., the motor zero position, which is the initial position when the coil spring 6 is tightened for 6 turns;

[0072] 23) Install the lower end of the product bushing 13 onto the rotating shaft 1 of the pull rope sensor via a flat mounting;

[0073] 3. Load product 7

[0074] 31) Slide the connecting cylinder 12 upward along the motor bushing 11 to create a vertical space for the installation of product 7, and install the fixing seat 3 of the pull rope sensor product 7 into the mounting position on the base plate 8 for fixation;

[0075] 32) Since the coil spring 6 is already in a near-natural state when it is installed, in order to align the shaft 1 and the motor 10 shaft, it is necessary to overcome a small coil spring force to rotate the shaft 1 to the set position so that the flat end of the shaft 1 is in the same direction as the set position.

[0076] 33) After alignment, the connecting cylinder 12 will automatically fall due to gravity, thus achieving the alignment and connection between the rotating shaft 1 and the motor shaft 10.

[0077] 4. Automatic winding

[0078] 41) Determine the number of rotations T of motor 10 required based on the range of the pull rope sensor product 7 (the number of rotations required to tighten the coil spring 6 varies for pull rope sensors of different lengths. In this example, the 8m range corresponds to 636 rotations of the coil spring 6. Start and control motor 10 to rotate to the set number of rotations and then stop to complete the tightening process of coil spring 6.

[0079] 42) After the coil spring 6 tightens and the motor 10 stops, select the binding port 21 closest to the set position to fix one end of the flexible cable. At this time, the angle between the binding port 21 and the set position does not exceed

[0080] 43) Start motor 10 and rotate motor 10 in the opposite direction according to the set number of reverse rotations P. In this example, the 8m range corresponds to 30.8 reverse rotations. During the reverse rotation, the flexible cable is wound onto the winding wheel 2, thereby completing the winding.

[0081] In this invention, the number of forward rotations T is generally greater than the number of reverse rotations P. A set preload is applied to the coil spring 6. In this example, the 8m range product has a preload of 5.2 rotations. In order to ensure consistent winding tightness with the preload corresponding to this number of preload rotations during subsequent calibration, standardization and measurement, and thus ensure that the difference in the flexible cable length of each rotation remains consistent after multiple rotations, the pull-out length can also be kept consistent during subsequent calibration, which can effectively improve the accuracy of calibration, standardization and measurement.

[0082] 44) Slide the connecting shaft cylinder 12 upwards to separate the lower end of the connecting shaft cylinder 12 from the product bushing 13. Then remove the pull rope sensor from the mounting position on the base plate 8, and finally remove the product bushing 13.

[0083] In summary, the current winding process for rope sensors typically uses a fixed shaft and rotating base. This method has the advantage of requiring only the rotation of the base to tighten the coil spring, and the motor only needs to rotate once. However, the base is not a rotating component and is relatively large, making it prone to wobbling during rotation. This can easily lead to uneven winding due to interference. This invention redesigns the winding process, using a forward and reverse rotation method to drive the shaft instead of the rotating base commonly used by manufacturers in this field. It provides a new method that differs from existing methods while achieving the required winding consistency and accuracy. This opens up new ideas and methods for product manufacturing in this field, facilitating product technology upgrades and domestic substitution.

[0084] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A method for improving the consistency of the winding rope length of a pull rope sensor, the pull rope sensor comprising a fixed base (3), a winding wheel (2), a rotating shaft (1), a coil spring rotating sleeve (4), and a coil spring (6), wherein the fixed base (3) has a winding wheel mounting chamber on one side for mounting the winding wheel (2) and a coil spring mounting chamber on the other side for mounting the coil spring (6), the rotating shaft (1) passes through the center holes of the winding wheel (2) and the fixed base (3) in sequence and then mounts the coil spring rotating sleeve (4), the inner hook (62) of the coil spring (6) is engaged and fixed with the inner hook mounting groove (41) of the coil spring rotating sleeve (4), the outer hook (61) is engaged and fixed with the outer hook mounting groove (31) on the inner wall of the coil spring mounting chamber, and the coil spring (6) is tightened and loosened under the drive of the rotating shaft (1), characterized in that, The winding wheel (2) has multiple binding holes (21) arranged at equal intervals along the circumference on the side wall, and the spring mounting chamber has multiple hook mounting slots (31) arranged at equal intervals along the circumference on the inner wall. The winding tooling includes a base plate (8), a motor (10), a motor bushing (11), a connecting shaft (12), and a product bushing (13). Includes the following steps: 1) Assemble the coil spring of the pull rope sensor to be wound, specifically including the following steps: 11) Install the coil spring rotating sleeve (4) on the rotating shaft (1) and engage and fix the inner hook (62) of the coil spring (6) with the inner hook mounting slot (41) on the coil spring rotating sleeve (4); 12) Rotate the flat end of the shaft (1) in the corresponding direction and keep it in the set position, i.e., the motor zero position; 13) Place the coil spring (6) with the inner hook (62) fixed in a natural state in the coil spring mounting compartment of the fixing seat (3), and engage and fix the outer hook (61) of the coil spring (6) with the nearest outer hook mounting slot (31); 2) Assemble the winding fixture and insert the pull rope sensor to be wound, specifically including the following steps: Install the rope sensor into the mounting position on the base plate (8) and fix it. Rotate the shaft (1) to the set position so that the shaft (1) and the output shaft of the motor (10) are aligned to the set position, so as to achieve the alignment connection between the shaft (1) and the output shaft of the motor (10). 3) Start the motor to complete the automatic winding process, which includes the following steps: 31) Determine the number of rotations T of the motor (10) required based on the range of the pull rope sensor to be wound, start and control the motor (10) to rotate to the number of rotations T and then stop, thus completing the tightening process of the coil spring (6); 32) After the coil spring is tightened, fix one end of the flexible cable at the binding hole (21) closest to the set position; 33) Start the motor (10) and rotate it in the opposite direction according to the set number of reverse rotations P. During the reverse rotation, the flexible cable is wound onto the winding wheel (2). 34) Slide the connecting shaft cylinder (12) upward to separate the lower end of the connecting shaft cylinder (12) from the product bushing (13), remove the pull rope sensor to be wound, and then remove the product bushing to complete the winding process.

2. The method for improving the consistency of the winding rope length of a pull-rope sensor according to claim 1, characterized in that, The number of binding holes (21) And the angle range covered by each binding hole is .

3. The method for improving the consistency of the winding rope length of a pull-rope sensor according to claim 1, characterized in that, The number of the outer hook mounting slots (31) ,and .

4. The method for improving the consistency of the winding rope length of a pull-rope sensor according to claim 1, characterized in that, The motor bushing (11) is a cylindrical sleeve with two symmetrically distributed grooves on its cylindrical surface. The upper end of the motor bushing (11) has a flat opening and is fixedly connected to the output shaft of the motor (10). The connecting shaft sleeve (12) is inserted into the lower flat opening of the motor bushing (11). Pins are installed on the left and right side walls of the connecting shaft sleeve (12). The pins slide up and down and are limited in the groove of the motor bushing (11). The lower end of the product bushing (13) is a flat groove and is connected to the rotating shaft (1). A shoulder is provided in the middle, and the upper end is a flat shaft that matches the shape of the lower end of the connecting shaft sleeve (12).

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