Service life detection device suitable for pull rope displacement sensor and use method thereof

Abstract

The invention belongs to the technical field of displacement sensor detection, and particularly discloses a service life detection device suitable for a pull rope displacement sensor and a use method of the service life detection device. The service life detection device is characterized in that a machine table is provided with a mounting seat used for temporarily fixing the detected pull rope displacement sensor; the screw rod sliding table is connected with the driving motor, and the screw rod sliding table is driven by the driving motor to do reciprocating rectilinear motion; the movement direction of the screw rod sliding table corresponds to the pull rope direction of the pull rope displacement sensor; the lead screw sliding table is provided with a sliding block used for being connected with a pull head of a tested pull rope displacement sensor. The counter and the motor speed regulator are respectively in communication connection with the limiting sensor; the two limiting sensors are arranged at the two ends of the stroke of the lead screw sliding table respectively. And the limiting sensor is used for detecting a position signal of the slide block moving to a stroke end point, transmitting the signal to the motor speed regulator to control the driving motor to reverse, and transmitting the signal to the counter to record a motion period, so that the authenticity and reliability of test data are ensured.

Description

Technical Field

[0001] This invention belongs to the field of displacement sensor detection technology, and more specifically, relates to a life detection device for a pull-rope displacement sensor and its usage method. Background Technology

[0002] As a widely used displacement measurement device, the draw-wire displacement sensor plays an indispensable role in many important fields such as monitoring, gate opening measurement, and industrial machinery measurement and control. Its core working principle is to accurately measure the target displacement by detecting the length of the pulled-out wire rope, providing reliable data support for operation monitoring and parameter control in various fields. The overall structure of the draw-wire displacement sensor mainly consists of three parts: the wire rope, the internal transmission mechanism, and the electronic components. Among them, the wire rope and the internal transmission mechanism are the key core components that determine the working performance of this type of sensor. Their structural stability, wear degree, and fitting accuracy directly affect the service life, measurement accuracy, and overall reliability of the draw-wire displacement sensor, forming the basis for ensuring the long-term stable operation of the sensor and a key research focus for improving sensor product quality in the industry.

[0003] Currently, existing testing methods for cable displacement sensors have significant limitations. Their testing scope is primarily focused on individual components, specifically the steel wire rope of the sensor and individual parts such as the springs and gears in the internal transmission mechanism. A comprehensive testing solution for the overall performance of key components has not yet been developed. In practical testing, the mainstream method uses a roller-type structure. This structure uses a servo motor to drive a roller to rotate, simulating the expansion and contraction of the steel wire rope by winding it around the roller, thus enabling the testing of related components. Furthermore, dedicated testing equipment for individual components such as steel wire ropes, springs, and gears is independently designed and manufactured, each corresponding to a specific testing object, lacking versatility.

[0004] The aforementioned existing technologies have many shortcomings, making them unable to effectively meet the actual testing needs of wire rope displacement sensors and difficult to achieve accurate, efficient, and low-cost testing of key sensor components. For example, existing testing methods only test a single component and do not consider the cooperation relationship between the wire rope and the internal transmission mechanism. The accuracy of their cooperation directly affects the overall performance of the sensor, resulting in the test results failing to fully reflect the actual working state of the sensor. Secondly, dedicated testing equipment for single components is expensive, and the testing process is complex and difficult to operate, significantly increasing the testing costs and workload for enterprises and hindering the widespread application of testing technologies. Furthermore, the mainstream reel-type detection structure, which uses a servo motor to drive a roller to wind a steel wire rope, is inconsistent with actual user scenarios. In practice, users mostly use a straight-pull method rather than the roller winding method, resulting in a deviation between the detection process and actual operating conditions. This leads to insufficient accuracy in the detection results, failing to truly reflect the sensor's performance in real-world use. In addition, the reel-type detection method requires a long time for the steel wire rope to retract from its fully stretched state to its initial position, extending the entire detection cycle and reducing detection efficiency, thus failing to meet the rapid detection requirements of large-volume sensors. Summary of the Invention

[0005] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a life detection device and its usage method suitable for a draw rope displacement sensor. By integrating various components on the machine, an automated testing device that highly simulates the actual direct pull working conditions is constructed. Moreover, the device has a simple structure, controllable cost, and convenient operation, which not only ensures the authenticity and reliability of the test data, but also meets the dual requirements of high efficiency and economy for industrial batch quality inspection.

[0006] To achieve the above objectives, the present invention provides a life detection device suitable for a draw rope displacement sensor, comprising: a machine base, a drive motor, a lead screw slide, a limit sensor, a counter, and a motor speed controller mounted on the machine base; The machine base is equipped with a mounting bracket for temporarily fixing the measured rope displacement sensor; The lead screw slide is connected to the drive motor, and the lead screw slide is driven by the drive motor to perform reciprocating linear motion; the direction of motion of the lead screw slide corresponds to the direction of the pull wire of the pull rope displacement sensor; The lead screw slide is equipped with a slider for connecting the pull head of the displacement sensor of the measured rope; The counter and the motor speed controller are respectively connected to the limit sensor; the two limit sensors are respectively located at both ends of the stroke of the lead screw slide; the limit sensor is used to detect the position signal of the slider moving to the end of the stroke, and transmits the signal to the motor speed controller to control the commutation of the drive motor, and at the same time transmits it to the counter to record the motion cycle.

[0007] Furthermore, the mounting base has a rectangular groove structure, with its groove opening facing downwards at the upper end of the machine base and its two sides fixedly connected to the machine base; the upper surface of the mounting base is evenly provided with a plurality of threaded holes, which are used to cooperate with the base adapted on the pull rope displacement sensor to fix the pull rope displacement sensor.

[0008] Furthermore, during a complete reciprocating motion, the slider will sequentially trigger the two limit sensors located at both ends of the stroke once each, and this process will trigger the counter to accumulate and record one motion cycle.

[0009] Furthermore, the counter includes: a main counting unit and a carry display unit; the main counting unit is used to record a single reciprocating motion cycle; the carry display unit is used to record the cumulative lifespan data of the over-range; the main counting unit is configured to: automatically clear to zero when its count value reaches a preset upper limit, and synchronously send a carry signal to the carry display unit to increment the value of the carry display unit by one.

[0010] Furthermore, the life detection device also includes a control module and a grating ruler; The grating ruler is mounted on the upper part of the machine platform and parallel to the lead screw slide. Its moving end moves synchronously with the slider to measure the absolute physical displacement value of the slider in real time. The control module is located on the machine platform and is communicatively connected to the rope displacement sensor, the counter, the motor speed controller, and the grating ruler.

[0011] Furthermore, the control module is configured to: when any of the limit sensors is triggered, synchronously acquire the output signal of the pull rope displacement sensor and the displacement data of the grating ruler, and save a set of comparison data.

[0012] Furthermore, the control module is configured to: compare the output signal of the pull rope displacement sensor with the displacement data of the grating ruler in real time, and calculate the linearity error; when the linearity error exceeds a preset threshold, record the current number of motion cycles and the failed motion mode.

[0013] Furthermore, the control module controls the drive motor to execute a preset non-uniform speed motion mode through the motor speed controller; the non-uniform speed motion mode includes at least a slow pull-fast return mode, a fast pull-slow return mode, or a segmented speed change mode, to simulate the impact condition when the cable retracts.

[0014] Furthermore, the segmented speed change mode includes an S-shaped motion mode, which includes seven consecutive motion stages: acceleration stage, uniform acceleration stage, deceleration stage, uniform speed stage, acceleration / deceleration stage, uniform deceleration stage, and deceleration / deceleration stage.

[0015] A second aspect of the present invention provides a method of using a life detection device suitable for a drawstring displacement sensor, applied to the life detection device as described above, comprising the following steps: S1: Fix the cable displacement sensor to be tested to the mounting base on the machine tool through its base, ensuring that the direction of its cable is aligned with the movement axis of the lead screw slide; then, connect the cable displacement sensor's pull head to the slider on the lead screw slide. S2: Set the operating mode and speed of the drive motor through the motor speed controller; S3: Start the drive motor, which drives the lead screw slide to move in a straight line. The slider then pulls the wire rope of the pull rope displacement sensor to achieve the pulling action. When the slider triggers the limit sensor at one end of the stroke, the limit sensor sends a reversing signal to the motor speed controller, causing the drive motor to reverse. When the slider moves in the opposite direction to the other end of the stroke and triggers the second limit sensor, the drive motor reverses again, completing a complete motion cycle. S4: Each time the slider completes a full reciprocating motion as described in step S3, the counter automatically accumulates one motion cycle and records the accumulated cycle number in real time; S5: Stop the test when the preset life cycle number is reached or the rope displacement sensor fails; S6: Export the total number of cycles and process data recorded by the counter, and after replacing the rope displacement sensor, repeat steps S1 to S5 to conduct a new round of testing.

[0016] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1. The life testing device of the present invention constructs an automated testing device that highly simulates the actual direct-drive operating conditions through various components integrated on the machine base. The device has a simple structure, controllable cost, and convenient operation, which not only ensures the authenticity and reliability of the test data, but also meets the dual requirements of high efficiency and economy for industrial batch quality inspection.

[0017] 2. The life testing device of the present invention, by setting uniform threaded holes on the mounting base, can be compatible with various specifications of pull rope displacement sensors, which is convenient for replacement and debugging. At the same time, it ensures that the sensor axis is strictly aligned with the movement direction of the lead screw slide, thereby truly reproducing the stress state under the direct pull condition, significantly improving the accuracy and repeatability of the test results, and meeting the requirements of high consistency life testing.

[0018] 3. The life testing device of the present invention, by setting up a main counting unit and a carry display unit, can realize continuous and complete recording of large-scale life test data, avoid data loss due to counting overflow, and facilitate operators to intuitively read long-term test results, significantly enhancing the reliability and practicality of the testing device in high-cycle application scenarios.

[0019] 4. The life testing device of the present invention automatically records the number of motion cycles and the corresponding failure mode when the linearity error exceeds a preset threshold through the control module, thereby realizing the quantitative assessment of the sensor performance degradation process and early failure warning, thus improving the intelligence level of life testing, providing key data support for product quality analysis and reliability improvement, and significantly enhancing the objectivity, accuracy and engineering application value of the test results.

[0020] 5. The life testing device of the present invention tests the cable displacement sensor by executing a preset non-uniform motion mode, which can overcome the limitations of traditional uniform speed testing, making life testing closer to complex field environments, and effectively exposing potential defects of the sensor such as structural fatigue, transmission lag or signal distortion under transient loads. At the same time, different speed modes can be switched as needed, improving the device's adaptability and test coverage for multiple types of cable displacement sensors. Furthermore, by accurately reproducing impact conditions, it significantly enhances the rigor and engineering guidance value of life assessment, providing more representative data support for product reliability verification. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the life detection device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the control module in an embodiment of the present invention; Figure 3 This is a schematic flowchart illustrating the steps of using the life detection device according to an embodiment of the present invention.

[0022] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-rope displacement sensor, 2-machine base, 201-mounting base, 3-drive motor, 4-screw slide, 5-limit sensor, 6-counter, 7-motor speed controller, 8-control module, 801-processor, 802-user interface, 803-network interface, 804-memory, 805-communication bus, 9-grating ruler. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0024] Example 1 Please refer to Figure 1 and Figure 2 This invention provides a life detection device for a pull rope displacement sensor, comprising: a machine base 2, a drive motor 3 mounted on the machine base 2, a lead screw slide 4, a limit sensor 5, a counter 6, and a motor speed controller 7; The machine base 2 is provided with a mounting base 201 for temporarily fixing the measured rope displacement sensor 1; The lead screw slide 4 is connected to the drive motor 3, and the lead screw slide 4 is driven by the drive motor 3 to perform reciprocating linear motion; the direction of motion of the lead screw slide 4 corresponds to the direction of the pull wire of the pull rope displacement sensor 1. The lead screw slide 4 is equipped with a slider for connecting the pull head of the measured rope displacement sensor 1; The counter 6 and the motor speed controller 7 are respectively connected to the limit sensor 5; the two limit sensors 5 are respectively located at both ends of the stroke of the lead screw slide 4; the limit sensor 5 is used to detect the position signal of the slider moving to the end of the stroke, and transmits the signal to the motor speed controller 7 to control the commutation of the drive motor 3, and at the same time transmits it to the counter 6 to record the motion cycle.

[0025] Understandably, during use, through the above design, the tested wire rope displacement sensor 1 is temporarily fixed to the machine base 2 via the mounting base 201, and its wire direction is strictly aligned with the reciprocating linear motion direction of the lead screw slide 4, ensuring that the wire rope is always under stress in the actual application scenario during the test, effectively overcoming the problem that the traditional reel-type winding test does not match the user's actual usage method; the drive motor 3 drives the lead screw slide 4 to achieve highly repeatable and highly stable linear reciprocating motion, and the slider is directly connected to the pull head of the wire rope displacement sensor 1, thereby accurately reproducing the full stroke action of pulling out and retracting; the limit sensor 5 is set at both ends of the stroke of the lead screw slide 4, which can detect the signal of the slider reaching the limit position in real time, and simultaneously trigger the motor speed controller 7 to control the drive motor 3 to automatically switch directions, while transmitting the signal to the counter 6 to accurately record the number of complete motion cycles.

[0026] In an optional embodiment, the mounting base 201 has a rectangular groove structure, with its groove opening facing downwards at the upper end of the machine base 2 and its two sides fixedly connected to the machine base 2. The upper surface of the mounting base 201 is uniformly provided with several threaded holes, which are used to mate with the base adapted to the pull rope displacement sensor 1 to fix the pull rope displacement sensor 1. It is understood that through the above design, it is compatible with pull rope displacement sensors 1 of various specifications, facilitating replacement and debugging, while ensuring that the sensor axis is strictly aligned with the movement direction of the lead screw slide 4, thereby truly reproducing the force state under direct pulling conditions, significantly improving the accuracy and repeatability of test results, and meeting the requirements of high-consistency life testing.

[0027] In an optional embodiment, the drive motor 3 includes a servo motor or a stepper motor, and its output end is connected to the input end of the lead screw slide 4 via a coupling or a synchronous belt. It should be noted that when the drive motor 3 drives the lead screw slide 4 to perform reciprocating linear motion via the synchronous belt, the output end of the drive motor 3 and the input end of the lead screw slide 4 are also provided with corresponding synchronous pulleys.

[0028] In an optional embodiment, the drive motor 3 is located at the upper end or inside the machine base 2. It should be noted that when the drive motor 3 is located inside the machine base 2, the machine base 2 is provided with a receiving cavity, and the top of the receiving cavity has a hole for accommodating the passage of the timing belt.

[0029] In an optional embodiment, the limit sensor 5 is a photoelectric sensor. It should be noted that photoelectric sensors have advantages such as fast response speed, high detection accuracy, and strong anti-interference capability. They can quickly and accurately capture the endpoint position signal of the slider, effectively avoiding signal misjudgment, further improving the stability of the detection process and the accuracy of the detection data. They are suitable for high-frequency reciprocating motion detection scenarios in the life detection of pull-rope displacement sensors. Furthermore, their simple structure and convenient installation can reduce the overall maintenance cost of the device. In other embodiments, other types of limit sensors can also be used; no specific limitations are made here.

[0030] In an optional embodiment, the counter 6 and the motor speed controller 7 are disposed on the upper surface of the mounting base 201, thereby facilitating the operator to intuitively observe the working status and real-time data of the counter 6 and the motor speed controller 7 during the testing process.

[0031] In an optional embodiment, during a complete reciprocating motion, the slider will sequentially trigger each of the two limit sensors 5 located at both ends of the stroke once. This process triggers the counter 6 to accumulate and record one motion cycle. It is understood that during use, the slider moves from one end to the other and back to the starting end, constituting one pull-out and retraction action. This mechanism precisely corresponds to one complete working cycle of the pull-string displacement sensor 1 in actual use. Therefore, the number of cycles recorded by the counter 6 accurately reflects the actual number of cycles in the lifespan of the device under test, effectively avoiding counting deviations caused by misjudgments due to a single trigger stroke, and improving the accuracy and repeatability of the lifespan test results.

[0032] In an optional embodiment, the counter 6 includes a main counting unit and a carry display unit; the main counting unit is used to record a single reciprocating motion cycle; the carry display unit is used to record the cumulative lifespan data exceeding the range; the main counting unit is configured to automatically reset to zero when its count value reaches a preset upper limit, and simultaneously send a carry signal to the carry display unit to increment the value of the carry display unit by one, thereby achieving continuous and complete recording of large-scale lifespan test data, avoiding data loss due to count overflow, and facilitating operators to intuitively read long-term test results, significantly enhancing the reliability and practicality of the testing device in high-cycle application scenarios.

[0033] Furthermore, the life testing device also includes a control module 8; the control module 8 is mounted on the machine base 2 and is communicatively connected to the counter 6 and the motor speed controller 7. Understandably, during use, the above design enables the control module 8 to collect motion cycle data recorded by the counter 6 in real time and dynamically adjust the output of the motor speed controller 7 according to preset parameters, thereby precisely controlling the running speed, start-stop sequence, and commutation logic of the drive motor 3. Simultaneously, through integrated control, not only is the automation level of the testing process improved, but the system's adaptability to different models of cable displacement sensors 1 is also enhanced. Furthermore, as a central coordination unit, the control module 8 can realize fault diagnosis, data storage, and human-machine interaction functions, significantly improving testing efficiency, data traceability, and operational safety, providing strong support for the high-reliability life verification of the cable displacement sensor 1.

[0034] It should be noted that the control module 8 further includes a processor 801, a user interface 802, a network interface 803, a memory 804, and at least one communication bus 805; wherein: the communication bus 805 is used to realize the connection and communication between these components; wherein, the user interface 802 may include a display screen and a keyboard, and optionally the user interface 802 may also include a standard wired interface and a wireless interface; the network interface 803 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface); the memory 804 may be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage device; the memory 804 may optionally be at least one storage device located away from the aforementioned processor 801; the memory 804, as a computer-readable storage medium, may include an operating system, a network communication module, a user interface module, and a device control application program; the network interface 803 provides network communication functions; the user interface 802 is mainly used to provide an input interface for the user; and the processor 801 can be used to call the device control application program stored in the memory 804.

[0035] It should be understood that in some feasible implementations, the processor 801 described above may be a central processing unit (CPU), or it may be other general-purpose processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor 801 may be a microprocessor or any conventional processor. The memory 804 may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of the memory 804 may also include non-volatile random access memory. For example, the memory 804 may also store device type information.

[0036] Furthermore, the life testing device also includes: a grating ruler 9; the grating ruler 9 is disposed on the upper end of the machine base 2 and parallel to the lead screw slide 4, and its moving end moves synchronously with the slider to measure the absolute physical displacement value of the slider in real time; the control module 8 is communicatively connected to the grating ruler 9 and the rope displacement sensor 1.

[0037] In an optional embodiment, the control module 8 is configured to: synchronously acquire the output signal of the pull-string displacement sensor 1 and the displacement data of the grating ruler 9 and save a set of comparison data when any of the limit sensors 5 is triggered. It is understood that through the above design, highly consistent reference and measured values ​​can be obtained at each stroke endpoint (i.e., the pull-out limit and the retraction limit position), effectively eliminating measurement deviations caused by asynchronous sampling timing. Simultaneously, by periodically recording the comparison data of the endpoint positions, not only can the changing trends of key performance indicators such as zero-point drift, repeatability, and endpoint consistency of the pull-string displacement sensor 1 be tracked throughout the entire life test process, but a reliable basis is also provided for subsequent failure analysis and quality assessment.

[0038] In an optional embodiment, the control module 8 is configured to: compare the output signal of the pull rope displacement sensor 1 with the displacement data of the grating ruler 9 in real time, and calculate the linearity error; when the linearity error exceeds a preset threshold, record the current number of motion cycles and the failed motion mode. It should be noted that the motion mode is a specific motion pattern performed by the slider to simulate actual working conditions.

[0039] It should be noted that in this embodiment, the grating ruler 9 is a common displacement measuring device in the prior art. In other embodiments, other types of displacement devices, such as magnetic grating rulers, may also be used. No specific limitation is made here.

[0040] In an optional embodiment, the threshold for the linearity error is 0.4% to 0.5%, and when the linearity error exceeds the limit for five consecutive motion cycles, the product is determined to be faulty, that is, a shutdown procedure is executed and an alarm is triggered.

[0041] In an optional embodiment, the control module 8 controls the drive motor 3 to execute a preset non-uniform speed motion mode through the motor speed controller 7. The non-uniform speed motion mode includes at least a slow pull-fast return mode, a fast pull-slow return mode, or a segmented speed change mode to simulate the impact condition when the pull cable retracts. It is understood that, in use, the above design can overcome the limitations of traditional uniform speed testing, making life testing closer to complex field environments, effectively exposing potential defects of sensors such as structural fatigue, transmission lag, or signal distortion under transient loads; at the same time, different speed change modes can be switched as needed, improving the adaptability and test coverage of the device to multiple types of pull cable displacement sensors 1, and thus significantly enhancing the rigor and engineering guidance value of life assessment by accurately reproducing impact conditions, providing more representative data support for product reliability verification.

[0042] In an optional embodiment, the segmented speed change mode includes an S-shaped motion mode, which includes seven consecutive motion stages: acceleration stage, uniform acceleration stage, deceleration stage, uniform speed stage, acceleration and deceleration stage, uniform deceleration stage, and deceleration and deceleration stage. This highly replicates the smooth start-stop and speed change pulling process applied to the rope displacement sensor 1 by manual operation or hydraulic actuator in actual working conditions.

[0043] Example 2 Please refer to Figure 3 This invention provides a method for using a life detection device suitable for a pull-rope displacement sensor, comprising the following steps: S1: Fix the cable displacement sensor 1 to be tested to the mounting base 201 on the machine tool 2 through its base, and ensure that its cable direction is aligned with the movement axis of the lead screw slide table 4; then, connect the cable displacement sensor 1 to the slider on the lead screw slide table 4. S2: Set the operating mode and speed of the drive motor 3 through the motor speed controller 7; S3: Start the drive motor 3, which drives the lead screw slide 4 to move in a straight line. The slider then pulls the wire rope of the pull rope displacement sensor 1 to achieve the pulling action. When the slider triggers the limit sensor 5 at one end of the stroke, the limit sensor 5 sends a reversing signal to the motor speed controller 7, causing the drive motor 3 to reverse. When the slider moves in the opposite direction to the other end of the stroke and triggers the second limit sensor 5, the drive motor 3 reverses again, completing a complete motion cycle. S4: Each time the slider completes a full reciprocating motion as described in step S3, the counter 6 automatically accumulates one motion cycle and records the accumulated cycle number in real time; S5: Stop the test when the preset life cycle number is reached or the rope displacement sensor 1 fails; S6: Export the total number of cycles and process data recorded by the counter 6, and after replacing the rope displacement sensor 1, repeat steps S1 to S5 to conduct a new round of testing.

[0044] Example 3 This invention also provides a computer-readable storage medium storing a computer program that is executed by a processor to implement the various steps in the life detection device usage method described above. For details, please refer to the implementation methods provided for the various steps described above, which will not be repeated here.

[0045] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0046] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0047] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0048] In this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit it; those skilled in the art will readily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lifespan detection device for a drawstring displacement sensor, characterized in that, include: Machine base (2), drive motor (3), lead screw slide (4), limit sensor (5), counter (6) and motor speed controller (7) mounted on the machine base (2); The machine base (2) is provided with a mounting base (201) for temporarily fixing the measured pull rope displacement sensor (1). The lead screw slide (4) is connected to the drive motor (3), and the lead screw slide (4) is driven by the drive motor (3) to perform reciprocating linear motion; the direction of motion of the lead screw slide (4) corresponds to the direction of the pull wire of the pull rope displacement sensor (1); The lead screw slide (4) is provided with a slider for connecting the pull head of the measured pull rope displacement sensor (1); The counter (6) and the motor speed controller (7) are respectively connected to the limit sensor (5); the two limit sensors (5) are respectively located at both ends of the stroke of the lead screw slide (4); the limit sensor (5) is used to detect the position signal of the slider moving to the end of the stroke, and transmits the signal to the motor speed controller (7) to control the commutation of the drive motor (3), and transmits it to the counter (6) to record the motion cycle.

2. The lifespan detection device according to claim 1, characterized in that, The mounting base (201) has a rectangular groove structure, with its groove opening facing downwards at the upper end of the machine base (2) and its two sides fixedly connected to the machine base (2); the upper surface of the mounting base (201) is uniformly provided with a number of threaded holes, which are used to cooperate with the base adapted on the pull rope displacement sensor (1) to fix the pull rope displacement sensor (1).

3. The lifespan detection device according to claim 1 or 2, characterized in that, During a complete reciprocating motion, the slider will trigger the two limit sensors (5) located at both ends of the stroke once in sequence. This process triggers the counter (6) to accumulate and record one motion cycle.

4. The life detection device according to claim 3, characterized in that, The counter (6) includes a main counting unit and a carry display unit; the main counting unit is used to record the cycle of a single reciprocating motion; the carry display unit is used to record the cumulative life data of the over-range; the main counting unit is configured to automatically clear to zero when its count value reaches a preset upper limit, and simultaneously send a carry signal to the carry display unit to increment the value of the carry display unit by one.

5. The lifespan detection device according to claim 3, characterized in that, The life detection device also includes a control module (8) and a grating ruler (9). The grating ruler (9) is located on the upper end of the machine base (2) and parallel to the lead screw slide (4). Its moving end moves synchronously with the slider and is used to measure the absolute physical displacement value of the slider in real time. The control module (8) is located on the machine base (2) and is communicatively connected to the rope displacement sensor (1), the counter (6), the motor speed controller (7) and the grating ruler (9).

6. The lifespan detection device according to claim 5, characterized in that, The control module (8) is configured to: when any of the limit sensors (5) is triggered, synchronously collect the output signal of the pull rope displacement sensor (1) and the displacement data of the grating ruler (9) and save a set of comparison data.

7. The lifespan detection device according to claim 6, characterized in that, The control module (8) is configured to: compare the output signal of the pull rope displacement sensor (1) with the displacement data of the grating ruler (9) in real time, and calculate the linearity error. When the linearity error exceeds the preset threshold, record the current number of motion cycles and the failure motion mode.

8. The lifespan detection device according to claim 7, characterized in that, The control module (8) controls the drive motor (3) to execute a preset non-uniform speed motion mode through the motor speed regulator (7); the non-uniform speed motion mode includes at least a slow pull-fast return mode, a fast pull-slow return mode, or a segmented speed change mode, in order to simulate the impact condition when the pull line retracts.

9. The lifespan detection device according to claim 8, characterized in that, The segmented speed change mode includes an S-shaped motion mode, which includes seven consecutive motion stages: acceleration stage, uniform acceleration stage, deceleration stage, uniform speed stage, acceleration-deceleration stage, uniform deceleration stage, and deceleration-deceleration stage.

10. A method of using a life detection device for a drawstring displacement sensor, applied to the life detection device according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Fix the pull rope displacement sensor (1) to be tested to the mounting base (201) on the machine (2) through its base, and ensure that its pull line direction is aligned with the motion axis of the lead screw slide (4); then, connect the pull head of the pull rope displacement sensor (1) to the slider on the lead screw slide (4); S2: Set the operating mode and speed of the drive motor (3) through the motor speed controller (7); S3: Start the drive motor (3) to drive the lead screw slide (4) to move in a straight line. The slider then pulls the wire rope of the pull rope displacement sensor (1) to achieve the pull-out action. When the slider triggers the limit sensor (5) at one end of the stroke, the limit sensor (5) sends a reversing signal to the motor speed controller (7) to reverse the drive motor (3). When the slider moves in the opposite direction to the other end of the stroke and triggers the second limit sensor (5), the drive motor (3) reverses again to complete a complete motion cycle. S4: Each time the slider completes a full reciprocating motion as described in step S3, the counter (6) automatically accumulates one motion cycle and records the accumulated cycle number in real time; S5: Stop the test when the preset life cycle number is reached or the rope displacement sensor (1) fails; S6: Export the total number of cycles and process data recorded by the counter (6), and repeat steps S1 to S5 for a new round of testing after replacing the rope displacement sensor (1).

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