Portable hard ladder intelligent detection device and detection method

Abstract

This invention proposes a portable intelligent testing device and method for rigid elevators. The device includes a control host and multiple optional testing modules, including a step detection device, a tension limit detection device, and a horizontal strength detection device. Each testing module is detachably connected to the control host via a unified quick-connect interface. The step and tension limit detection devices adopt a straddle-type tool-free overlapping structure formed by a base and parallel double extension arms. The horizontal strength detection device forms a self-balancing force system through a chassis and support frame. The control host is equipped with an RTOS real-time operating system, which executes PID closed-loop control tasks and independent safety monitoring tasks in parallel, realizing one-click module selection, automatic loading, anomaly protection, and intelligent result interpretation. The test data is collected in real time and automatically generates encrypted reports, supporting cloud upload. This invention integrates portability, intelligence, and digitalization, meeting the needs of rapid on-site testing of electric rigid elevators.

Description

Technical Field

[0001] This invention relates to the field of electrical safety equipment testing technology, and in particular to a portable intelligent testing device and method for rigid ladders. Background Technology

[0002] Elevated ladders are core tools for working at heights and must undergo preventative testing on a regular basis. Currently, most elevator testing equipment is of a modular, heavy structure, making it difficult to move and access confined spaces; its automation level is low, with parameter setting, load application, and result judgment heavily reliant on manual labor, resulting in low efficiency and poor consistency; furthermore, it lacks digital functionality, leading to fragmented data, difficulty in preserving curves, non-standardized reports, and an inability to archive and upload data, making it difficult to meet the digital management and control requirements of the power industry. Summary of the Invention

[0003] This invention provides a portable intelligent testing device and method for rigid ladders to solve the technical problems of rigid ladder testing devices being difficult to carry out on-site testing, relying on manual operation in the testing process, having a low level of automation, and being unable to achieve digital closed-loop management of testing data.

[0004] The portable rigid ladder testing device provided by this invention includes: Multiple testing devices, including a tread testing device for applying load to the treads of a rigid ladder, a tension testing device for applying load to the tension limiting device of an A-frame ladder, and a horizontal strength testing device for applying load to the beam of a rigid ladder. Each testing device includes a testing fixture and a loading execution unit and a force detection unit mounted on the testing fixture. A control host is configured to execute at least a control task and a safety monitoring task in parallel. The control task is used to control the loading execution unit to apply a test load to the rigid ladder based on target parameters and the detection value of the force detection unit. The safety monitoring task is used to monitor abnormal states and trigger protection actions, and the safety monitoring task operates independently of the control task.

[0005] In one optional embodiment of the present invention, the detection fixture includes a step detection fixture, a tension detection fixture, and a horizontal strength detection fixture; The loading execution unit includes multiple execution sub-units, each with different stroke specifications. The step detection fixture, the tension limit detection fixture, and the horizontal strength detection fixture are integrated with their respective execution sub-units to form independent detection modules. Each of the detection modules is detachably connected to the control host via a unified quick-connect interface.

[0006] In one optional embodiment of the present invention, the abnormal states monitored by the safety monitoring task include at least one of the following: abnormal force detection unit signal, force value exceeding a preset threshold, overload, travel limit triggering, current overcurrent, and emergency stop signal.

[0007] In one optional embodiment of the present invention, the loading execution unit is an electric actuator, and the control task outputs a pulse width modulation signal to the electric actuator through PID closed-loop control.

[0008] In one optional embodiment of the present invention, the step detection fixture includes a first base, and at least two parallel outwardly extending first extension arms are provided at the end of the first base. The first base and the first extension arms are straddling between two adjacent steps of the rigid ladder. The first loading execution unit is disposed at the bottom of the first base and is configured to abut between two steps to apply a test load to the steps of the rigid ladder.

[0009] In one optional embodiment of the present invention, the tension limiting detection device includes: The second base has at least two parallel outwardly extending second extension arms at its end, and the second base and the second extension arms are straddling the treads of the left and right ladder legs. The second loading execution unit is disposed at the bottom of the second base and is configured to abut between the two side ladder legs and to extend the ladder legs to apply a test load.

[0010] In one optional embodiment of the present invention, the horizontal strength detection device includes: A special support bracket is set on the testing platform. The special support bracket includes a first support frame and a second support frame for supporting the two ends of the rigid ladder respectively. The bottom of the first support frame and the second support frame is provided with a rolling element and a locking mechanism. A crossbeam is used to be placed horizontally above the two ladder beams of a rigid ladder; The chassis is mounted on the testing platform and located between the first support frame and the second support frame; The third base is mounted on the chassis. The third loading execution unit is mounted on one end of the third base near the crossbeam and connected to the crossbeam. When the third loading execution unit is activated, it drives the crossbeam to apply a vertically downward concentrated load to the ladder beam of the rigid ladder.

[0011] In one optional embodiment of the present invention, the control host is further provided with a parameter matching unit, an intelligent judgment unit, and a data management unit; The parameter matching unit stores parameter data of at least one detection standard, which is used to automatically match the corresponding loading parameters according to the detection mode selected by the user. The loading parameters include at least the target force value, loading speed and holding time. The intelligent interpretation unit is used to automatically output the detection conclusion according to the preset judgment rules after the detection is completed; The data management unit is used to record and store the test data generated during the testing process in real time, and automatically generate a test report based on the test data and the test conclusions. The data management unit is configured to export the test report and / or upload it to an external device via wireless communication.

[0012] This invention also proposes a portable method for detecting rigid ladders, comprising: A portable rigid ladder testing device is provided, which includes a control host and multiple testing devices. The testing devices include a tread testing device for applying load to the treads of the rigid ladder, a tension testing device for applying load to the tension limiting device of the A-frame ladder, and a horizontal strength testing device for applying load to the ladder beam of the rigid ladder. Each testing device includes a testing fixture and a loading execution unit and a force detection unit mounted on the testing fixture. Based on the test items to be tested, select the corresponding testing device from multiple testing devices and install it in place; The control host is started, and the control host runs at least two tasks in parallel: control tasks and security monitoring tasks. When a detection mode is selected, the control host automatically matches the corresponding loading parameters based on the selected mode. After the test begins, the control task controls the loading execution unit to apply a test load to the rigid ladder based on the loading parameters and the detection value of the force detection unit. The security monitoring task runs independently of the control task, monitors abnormal states in real time, and triggers protective actions when an abnormality is detected. The control host records and stores the test data generated during the testing process, and controls the loading execution unit to unload the force after the test is completed.

[0013] In one optional embodiment of the present invention, the step of selecting a corresponding detection device from a plurality of detection devices according to the test item to be detected and installing it in place includes: When selecting step strength testing, select a step testing device, place the step testing device on two adjacent steps of the rigid ladder, and position the first loading execution unit between the two steps. When selecting the tension limiting device strength test, select the tension limiting detection device, place the tension limiting detection device flat between the treads of the left and right legs of the A-frame ladder, and position the second loading execution unit between the two legs. When selecting horizontal strength testing, a horizontal strength testing device is selected, and the two ends of the rigid ladder are respectively supported on the two ends of a special bracket. The crossbeam is placed horizontally above the two ladder beams of the rigid ladder, and one end of the third loading execution unit is connected to the crossbeam.

[0014] The beneficial effects of the present invention are as follows: The portable intelligent testing equipment and testing method for rigid ladders proposed in this invention adopts a modular architecture of "one machine with multiple testing modules", which integrates the step testing device, tension limiting testing device and horizontal strength testing device into three independent testing modules. Each module is detachably connected to the control host through a unified quick-connect interface, realizing flexible switching and rapid deployment of testing functions, and is lightweight and portable. The step detection device and tension detection device adopt a "base + parallel double extension arm" straddle-type tool-free overlapping structure, which uses the geometry of the ladder itself to form a counter-locking force system, enabling rapid deployment that is "ready to use as soon as it is placed on the ground". The horizontal strength detection device uses a chassis and support frame structure to form a closed force loop, realizing the self-balancing of internal forces of the system. It can ensure loading stability without relying on a heavy foundation. The horizontal support uses rollers and buckles, which can be pushed and locked, can enter narrow spaces, and is suitable for outdoor mobile detection, solving the problems of traditional equipment being bulky, difficult to transport, and limited by the site. The control host is equipped with an RTOS real-time operating system, which runs control tasks and safety monitoring tasks in parallel through a multi-task scheduling mechanism. The control task outputs PWM signals to drive the electric push rod through a PID closed-loop control algorithm, realizing automatic loading, pressure holding and unloading, achieving smooth loading with slow start and stop and precise force control. The loading speed is adjustable and the force accuracy reaches ±1%. The safety monitoring task runs independently and automatically stops in case of abnormality, which significantly improves the safety and reliability of the detection process. The parameter matching unit automatically matches standard parameters after one-click model selection. The intelligent judgment unit automatically judges the results and marks abnormalities based on curve characteristics, effectively reducing human error, with good consistency and high efficiency. By controlling the host configuration parameter matching unit, intelligent interpretation unit, and data management unit, the entire process of digital closed-loop management is realized, from automatic matching of test parameters, millisecond-level acquisition of test data and real-time curve plotting, automatic judgment of test results, to automatic generation of standardized digital reports, local encrypted storage, and one-click upload to the cloud. The data is traceable and tamper-proof throughout the process, fully meeting the needs of digital, standardized, and archival management of power safety tools and equipment. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1 This is a schematic diagram of the structure of a portable rigid ladder testing device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the module structure of the control host of the portable rigid ladder detection device provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the step detection device of the portable rigid ladder detection equipment provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of the bottom structure of the step detection device of the portable rigid ladder detection equipment provided in one embodiment of the present invention; Figure 5 This is a schematic diagram of the tension detection device of a portable rigid ladder detection equipment provided in one embodiment of the present invention; Figure 6 This is a schematic diagram of the bottom structure of the tension detection device of the portable rigid ladder detection equipment provided in one embodiment of the present invention; Figure 7 This is a schematic diagram of the crossbeam structure of a portable rigid ladder detection device provided in one embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the third base of the portable rigid ladder detection device provided in one embodiment of the present invention; Figure 9 This is a schematic diagram of the chassis structure of a portable rigid ladder testing device provided in one embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of a dedicated bracket for a portable rigid ladder testing device provided in one embodiment of the present invention.

[0017] The attached figures are labeled as follows: 100. Control host; 200. Step detection device; 300. Tension limit detection device; 400. Horizontal strength detection device; 500. Force detection unit; 210. First base; 220. First extension arm; 230. First loading execution unit; 310. Second base; 320. Second extension arm; 330. Second loading execution unit; 410. Crossbeam; 420. Third base; 430. Chassis; 440. Third loading execution unit; 450. First support frame; 460. Second support frame. Detailed Implementation

[0018] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0021] Power ladders are core tools for working at heights and must undergo preventative testing regularly. Current testing equipment has several shortcomings: most are modular, heavy-duty structures, making them bulky, difficult to move, and hard to access confined work areas, hindering on-site transport and testing; automation levels are low, with parameter setting, load application, result judgment, and data recording heavily reliant on manual operation, resulting in low testing efficiency, inconsistent results, and susceptibility to human error; furthermore, digital functionality is lacking, leading to fragmented test data, difficulty in preserving test curves, non-standardized report formats, and an inability to automatically archive and upload data online, failing to meet the digital and intelligent management requirements of the power industry. Therefore, the industry urgently needs a comprehensive testing solution integrating portability, intelligence, and digitalization to meet the needs of rapid, accurate, and compliant on-site testing operations.

[0022] Please see Figures 1 to 10This invention provides a portable rigid ladder testing device that integrates portability, intelligence, and digitalization, meeting the needs of rapid on-site testing of electric rigid ladders. The portable rigid ladder testing device includes multiple testing devices and a control host 100. The device is equipped with multiple optional testing devices, each capable of performing different types of strength tests. Specifically, these include a rung testing device 200 for applying loads to the rigid ladder rungs, a tension testing device 300 for applying loads to the tension limiting device of an A-frame ladder, and a horizontal strength testing device 400 for applying loads to the rigid ladder beams. Each testing device includes a testing fixture and a loading execution unit and a force detection unit 500 mounted on the fixture. The testing devices are detachably connected to the control host 100 via a unified quick-connect interface. The control host 100 serves as the control core of the entire device, internally equipped with a real-time operating system (RTOS). This operating system executes control tasks and safety monitoring tasks at least in parallel. The control task is used to control the loading execution unit to apply precise test loads to the rigid ladder under test through a closed-loop control algorithm, based on pre-set target parameters and real-time feedback detection values ​​from the force detection unit 500. The safety monitoring task operates completely independently of the control task. It monitors various abnormal states that occur during the detection process in real time and immediately triggers protective actions when an abnormality occurs, such as emergency power cut-off and sound and light alarms, to ensure the safety and reliability of the entire detection process.

[0023] Please see Figures 1 to 10 It should be noted that in actual use, operators can flexibly select any of the testing devices according to the testing items. The testing devices and the intelligent host are electrically and signal-connected using quick-connect tool-free connectors. They work independently but share the same control and data management system, forming a modular architecture of "common machine, multi-mode, quick-connect interconnection". When testing the strength of the steps, the step testing device 200 is selected and placed between adjacent steps of the rigid ladder. The control host 100 drives the loading execution unit to apply force to the steps. When testing the strength of the tension limiting device, the tension limiting testing device 300 is selected and placed between the two legs of the A-frame ladder. The loading execution unit opens the ladder legs to both sides to test the tension limiting device. When testing the horizontal strength, the horizontal strength testing device 400 is selected. The rigid ladder is horizontally supported on a special bracket, and a vertically downward concentrated load is applied to the ladder beam through the crossbeam 410.

[0024] Please see Figures 1 to 10In an optional embodiment of the present invention, during the detection process, the force detection unit 500 continuously collects force data and transmits it to the control host 100. The control task adjusts the output of the loading execution unit in real time according to the force feedback to achieve stable and accurate loading control. In a specific embodiment, the force measurement range is 0 to 2kN, the measurement accuracy is ±1%, and the resolution is ≤1N. The safety monitoring task runs independently throughout the process, ensuring timely shutdown protection in case of emergencies such as force exceeding limits, sensor malfunction, overload, limit triggering, overcurrent, and emergency shutdown. This effectively avoids the safety response delay caused by program blocking and avoids the risk of ladder breakage or personnel injury due to response lag. The control host 100 is equipped with a high-definition touch screen as a human-machine interface and has a built-in multi-mode wireless module that supports multiple wireless communication methods such as WiFi, 433MHz, and LoRa, which can meet the data transmission needs in different scenarios. The entire machine is powered by a lightweight lithium battery, which can work continuously for more than 8 hours after a 2-hour charge, meeting the needs of all-weather outdoor operations. The total weight of the machine, including the battery, is controlled at around 30kg, which can be carried and transported by a single person, fully embodying the concept of lightweight design.

[0025] Please see Figures 1 to 10 In an optional embodiment of the present invention, the control host 100 is equipped with an RTOS real-time operating system and adopts a multi-task scheduling mechanism. The real-time operating system runs control tasks, sensing tasks, motor tasks, and safety monitoring tasks in parallel. The control task runs at millisecond-level cycles. Based on preset target parameters (such as the target force value and loading speed specified by the standard) and the detection value fed back in real time by the force detection unit 500, it outputs a high-frequency pulse width modulation (PWM) signal to the loading execution unit through the internal motor driver, thereby controlling the loading execution unit to smoothly apply the test load to the rigid ladder through the detection device. The sensing task synchronously reads the raw data of the force sensor at high frequency and completes the filtering process. The motor task quickly responds to pressurization, depressurization, and shutdown commands. The safety monitoring task runs independently and in parallel, monitoring for faults such as sensor abnormalities, force over-limits, and emergency shutdowns in real time, and triggering protection actions. The safety monitoring task runs completely independently of other tasks, ensuring that the safety response is not blocked by the main program, and significantly improving the stability, safety, and reliability of the detection process.

[0026] Please see Figures 1 to 10In an optional embodiment of the present invention, the abnormal states monitored by the safety monitoring task include at least a variety of situations such as abnormal force detection unit 500 signal, force value exceeding a preset safety threshold, overload, travel limit triggering, current overcurrent, and emergency stop signal triggering. Abnormal force detection unit 500 signal refers to the sudden loss of sensor output signal, exceeding the normal range, or exhibiting obvious and unreasonable jumps. In this case, the safety monitoring task determines that the sensor may be faulty or loosely connected, and immediately triggers a protection action to prevent the control system from making dangerous decisions based on erroneous feedback. Force value exceeding the preset safety threshold means that the currently applied load exceeds the maximum allowable value specified by the test standard. Once the safety monitoring task detects this situation, it will immediately cut off the power supply to the electric push rod. Overload protection means that when the motor current of the loading execution unit continuously exceeds a certain proportion of the rated value, it determines that the mechanical mechanism may be jammed or overloaded, and the safety monitoring task triggers protection to prevent motor burnout. Travel limit triggering means that when the push rod reaches the mechanical or electronic limit setting point, the safety monitoring task instructs the motor to stop operating to prevent the push rod from impacting the end and causing structural damage. Overcurrent refers to a momentary current in the motor driver exceeding the safe limit, typically caused by a short circuit or stall. The safety monitoring task responds and cuts off the output within microseconds. The emergency stop signal comes from a physical emergency stop button on the device. When the operator discovers any danger and presses the emergency stop button, this signal is sent directly to the safety monitoring task via a hardware interrupt, and the task immediately executes the power-off and alarm procedures. Because the safety monitoring task runs independently of the control task in the RTOS, its response is completely unaffected by the main program's loop cycle or the time consumed by the control algorithm's calculations, ensuring that the device can promptly enter a safe state under extreme conditions, significantly improving the stability, safety, and reliability of the detection process.

[0027] Please see Figures 1 to 10 In an optional embodiment of the present invention, the detection fixture includes a step detection fixture, a tension detection fixture, and a horizontal strength detection fixture. The loading execution unit includes multiple execution sub-units, each with different stroke specifications to adapt to the differentiated displacement requirements of different detection items. The step detection fixture, tension detection fixture, and horizontal strength detection fixture are integrated with their respective execution sub-units to form independent detection modules. Each detection module is detachably connected to the control host 100 via a unified quick-connect interface.

[0028] Understandably, in actual electrical safety equipment testing, the displacement and spatial orientation requirements differ for different testing items. For example, the rigid ladder tread strength test is a localized compression test, requiring a relatively short maximum deformation stroke, but demanding an extremely compact loading mechanism to extend between adjacent treads. In contrast, the tension limit test is a large-span test, requiring the loading mechanism to have a long stroke capacity. To address the significant differences in loading stroke and spatial orientation requirements for different strength tests, this device employs a modular design in its mechanical and electrical interface architecture. The electric actuator unit, serving as the loading execution unit, is divided into multiple execution sub-units, each with different stroke specifications and thrust characteristics. The tread detection fixture, A-frame ladder tension limit detection fixture, and horizontal ladder beam detection fixture are deeply integrated with their corresponding execution sub-units at the factory, forming highly independent and functionally specialized testing modules. For instance, the tread detection module integrates a short-stroke, high-thrust miniature electric actuator; while the horizontal strength testing module integrates a long-stroke, heavy-duty electric actuator. The testing device structure is adaptively designed according to spatial orientation requirements. This mechatronics modular design allows each module to achieve an optimal balance between size and performance in its specific testing scenario. The end of the electric actuator is detachably connected to an extension rod, and different specifications of extension rods can be selected according to different testing requirements.

[0029] Please see Figures 1 to 10Specifically, the step detection fixture is equipped with an electric push rod with a stroke of approximately 50mm as the first loading execution unit 230. Because the displacement required for the step strength test is relatively small, a short-stroke push rod is sufficient to meet the loading requirements. The tension limit detection fixture is equipped with an electric push rod with a stroke of approximately 500mm as the second loading execution unit 330. Because the tension limit device strength test of the A-frame ladder requires significantly extending the legs outwards, a large-stroke push rod is necessary to achieve effective loading. The horizontal strength detection fixture is equipped with an electric push rod with a stroke of approximately 350mm as the third loading execution unit 440 to meet the loading displacement requirements of the ladder beam bending test. The step detection fixture and its corresponding short-stroke push rod are integrated to form an independent step detection module; the tension limit detection fixture and its corresponding large-stroke push rod are integrated to form a tension limit detection module; and the horizontal strength detection fixture and its medium-stroke push rod are integrated to form a horizontal strength detection module. Each detection module internally completes the mechanical assembly and electrical wiring of the push rod, force sensor, and detection device body, leaving only a unified quick-connect electrical interface externally. This quick-connect interface integrates power supply lines, force sensor signal lines, and motor drive control lines. Operators simply need to insert the quick-connect plug of any detection module into the corresponding socket on the control host 100 to complete the electrical connection, without the need for any tools or individual wiring. This highly modular "one machine, multiple detection modules" hardware architecture distributes the overall weight, allowing operators to carry only the control host 100 and the required detection modules each time, reducing the burden of carrying and transporting. The unified electrical interface also ensures the standardization and interchangeability of the detection system, effectively reducing equipment procurement and carrying costs. The main structure of the detection device can be welded from aluminum alloy or high-strength steel pipes, meeting the requirements for lightweight design.

[0030] Please see Figures 1 to 10In an optional embodiment of the present invention, the loading execution unit adopts an electric actuator, and the control task outputs a PWM signal to the electric actuator through PID closed-loop control. The loading execution unit uses an electric actuator driven by a DC motor, and the actuator integrates a lead screw transmission mechanism, which can convert the rotational motion of the motor into the linear extension and retraction motion of the actuator, outputting a stable and controllable thrust. The control task runs in a fixed cycle at the millisecond level. In each cycle, it first obtains the target force value that should be reached at the current moment in the target force value curve. This target force value is automatically generated by the parameter matching unit according to the selected detection mode and standard. Then, it reads the real-time force value after filtering by the force detection unit 500 as a feedback signal. Then, it calculates the deviation between the target force value and the real-time force value, inputs the deviation into the PID control algorithm, and performs calculations through proportional, integral, and derivative stages to obtain the current required control output. The control task converts this output into a PWM signal with a corresponding duty cycle, which drives the DC motor of the electric actuator to operate through the motor drive circuit. When the deviation is large, the PWM duty cycle is large, and the push rod quickly approaches the target. As the deviation gradually decreases, the PID algorithm automatically reduces the duty cycle, and the push rod slowly approaches the target force value, achieving a smooth loading effect with gradual start and stop. The loading speed can be adjusted within the range of 100mm / min to 300mm / min to adapt to different standards and test requirements. During the pressure holding stage, the control task switches to constant force control mode. When a decrease in force value is detected due to slight material deformation, the PID closed loop automatically compensates with a small-amplitude load to maintain a constant force value. The sensing task synchronously reads the raw data from the force sensor at high frequency and performs filtering processing to provide a stable and reliable force feedback value for the control task. The motor task quickly responds to pressurization, depressurization, and shutdown commands to ensure timely execution. Through this closed-loop control method, the force value control accuracy can be stabilized within ±1%, and the loading process is uniform and smooth, effectively avoiding the influence of impact loading on the test results and significantly improving the consistency and reliability of the test data.

[0031] Please see Figures 1 to 10 In an optional embodiment of the present invention, within the RTOS multi-task architecture, the sensing task synchronously reads the raw data from the force sensor at high frequency and performs filtering processing to provide a stable and reliable force feedback value for the control task; the motor task quickly responds to pressurization, depressurization, and shutdown commands to ensure the timeliness of the execution actions. Compared with open-loop control or manual adjustment, this closed-loop control method can stabilize the force value control accuracy within ±1%, and the loading process is uniform and smooth, effectively avoiding the influence of impact loading on the detection results, and significantly improving the consistency and reliability of the detection data.

[0032] Please see Figures 1 to 4In an optional embodiment of the present invention, the step detection device 200 includes a first base 210, at least two parallel outwardly extending first extension arms 220 are provided at the end of the first base 210, and a first loading execution unit 230 is disposed at the bottom of the first base 210. The first base 210 and the first extension arms 220 span between two adjacent steps of the rigid ladder, and the first loading execution unit 230 abuts against the two steps to apply a test load to the steps of the rigid ladder. The end of the first loading execution unit 230 that abuts against the step (output end) may also be provided with a grooved pressure head or pressure plate. The geometry of the grooved pressure head or pressure plate is designed to match the outer diameter of the ladder step specified in the standard, and a tightly fitting rubber protective pad is provided on its inner wall; thereby, when applying a test load, it can effectively alleviate the stress concentration problem caused by hard metal contact, realize the uniform transmission of load, ensure the accuracy of vertical load application, and protect the surface of the insulated ladder.

[0033] Please see Figures 1 to 4In an optional embodiment of the present invention, the first extension arm 220 adopts a square tube structure, with two parallel extension square tubes. The first extension arm 220 and the first base 210 are detachably connected by a threaded screw. In the storage state, the extension arm can be removed, reducing the storage volume while ensuring that the first extension arm 220 and the first base 210 can basically meet the detection and loading requirements of various rigid ladders. A push rod cover is provided at the bottom of the first base 210, and the first loading execution unit 230 (i.e., the electric push rod sub-unit specifically used for step testing) is set inside the push rod cover. One end (fixed end) is fixed and equipped with a force sensor (force detection unit 500). An extension rod and a pressure plate are detachably installed at the end of the first loading execution unit 230 by a threaded or snap-fit ​​method. In actual use, the operator takes the first base 210 from the toolbox, screws the first extension arm 220 onto the end of the base, connects the extension rod to the first loading execution unit 230 at the bottom of the base, and plugs in the quick-connect cable to connect to the controller, completing the rapid assembly of the step clamp. Then, the assembled step clamp is placed flat on two adjacent steps of the rigid ladder, with the first base 210 and the two first extension arms 220 spanning the two steps. The clamp rests securely on the steps by its own weight. The first loading execution unit 230 at the bottom is located in the space between the two steps to apply force, eliminating the need for bolts, clamps, or other fasteners, achieving true "placing it on and using" tool-free installation. During testing, the end face of the sensor base acts as a static reaction point against the top or bottom surface of one step, while the output end of the first loading execution unit 230 extends and abuts against the opposite side (bottom or top surface) of the other step to be tested. When the push rod extends outward, it applies force to one side of the step, while the reaction force acts on the other step through the sensor seat on the other side, forming a counter-force system that directly applies the test load to the step itself. After the test is completed, simply remove the clamp from the step, disassemble the extension arm and push rod, place them in the toolbox, unplug the quick-connect cable, and store them. The entire machine is lightweight and can be easily moved by a single person. This double-beam straddle structure uses the first base 210 and parallel double-extension square tubes to construct a straddle support frame. It is not picky about the material of the ladder; whether it is bamboo, wood, or fiberglass step, it can be stably connected. It uses the geometry of the ladder itself to form a stable counter-locking force system. The structure is simple, the operation is convenient, and there is no need to drill holes or tie anything to the ladder, protecting the integrity of the ladder itself. With the PID closed-loop control of the control host 100, the first loading execution unit 230 smoothly loads the standard force value at the set speed, completing the load application for step strength testing. During the testing process, the force sensor collects data in milliseconds, and the control host 100 displays the force value, speed, and test curve in real time.

[0034] Please see Figures 1 to 4In one specific embodiment, during the treadle test, after the operator performs a self-test upon power-on, they select the "Treadle Strength" test mode on the touchscreen of the control host 100. The system automatically matches the treadle strength test parameters specified in the DL / T 1476-2023 standard, including the target force value, loading speed, and holding time. After positioning the ladder and aligning it with the testing device, the system enters intelligent calibration with a single click. The system automatically identifies the sensor zero point and completes the calibration. After starting the test, the system achieves intelligent loading through closed-loop control, with gradual start and stop, and smooth operation. It displays the force value, speed, test curve, equipment status, and alarm information in real time. When the standard force value is reached, if plastic deformation occurs in the treadle, the safety monitoring task quickly detects abnormal fluctuations in the force value, the system automatically stops and alarms, and the intelligent interpretation unit automatically outputs a "non-compliant" conclusion, generates an anomaly report, and uploads it to the cloud. If the step strength is qualified, the push rod is smoothly loaded to the target force value, and the system automatically completes the pressure holding time. During the pressure holding process, the force value remains stable within the qualified range. After the pressure holding is completed, the control task controls the push rod to smoothly unload the force, and the intelligent judgment unit determines "qualified". After the test is completed, the system automatically generates a standard report of force-displacement curves. The data is stored locally with encryption and supports PDF export and WiFi upload to the management platform.

[0035] Please see Figures 1 to 6 In an optional embodiment of the present invention, the tension limiting detection device 300 includes a second base 310, and at least two parallel outwardly extending second extension arms 320 are provided at the end of the second base 310. A second loading execution unit 330 is disposed at the bottom of the second base 310. The second base 310 and the second extension arms 320 span between the treads of the left and right ladder legs. The second loading execution unit 330 is configured to abut against the ladder legs on both sides and open the ladder legs to apply a test load. It is understood that since the ladder legs themselves have a certain opening angle when in use, the tension limiting detection device 300 needs to have sufficient stroke margin to open the ladder legs to the standard required test state. Therefore, in specific implementations, the second base 310 can be designed as a slender structure and equipped with a large stroke push rod, such as a push rod with a stroke of 500mm, to ensure that the load can be effectively applied to the tension limiting device on ladders of various specifications. The entire loading process is controlled in a closed loop by the control host 100, smoothly loading to the standard-specified force value (e.g., 765N) and holding the pressure for a specified time (e.g., 5 minutes) to verify whether the tension limiting device can effectively restrain the opening of the ladder legs and test whether its strength meets safety requirements. Similar to the step detection device 200, this structure can also achieve tool-free quick installation.

[0036] Please see Figures 1 to 6In an optional embodiment of the present invention, the second base 310 also adopts an aluminum alloy welded structure, which has sufficient rigidity and light weight. At least two parallel outwardly extending second extension arms 320 are detachably provided at the end of the second base 310. These are also two parallel extending square tubes. The square tubes and the second base 310 can be quickly installed and disassembled by screwing them together. The overall span of the second base 310 and the two second extension arms 320 is adapted to the tread spacing of the left and right legs of the A-frame ladder, ensuring that it can basically meet the detection and loading requirements of various rigid ladders. The second loading execution unit 330 is integrated into the push rod cover at the bottom of the second base 310 and works in conjunction with the force detection unit 500.

[0037] Understandably, the structure and installation method of the tension limiting detection device 300 are similar to those of the step detection device 200. When performing strength testing on the tension limiting device, the operator takes out the components of the tension limiting device from the toolbox, installs the second extension arm 320 and the push rod extension rod on the second base 310, and connects the quick-connect cable. On-site deployment does not require changing the normal standing posture of the A-frame ladder. Simply lay the tension limiting clamp flat, with its second base 310 and second extension arm 320 straddling the steps of the left and right legs of the A-frame ladder. The clamp is horizontally suspended between the two legs by its own weight. The ends of the two extension square tubes overlap the step on one side of the ladder, and the end of the second base 310 overlaps the step on the other side. The entire device is horizontally suspended by the physical span between the two square tubes and the outer casing. A force sensor is installed on the fixed end of the second loading execution unit 330. During testing, the sensor seat abuts against the side of the step of one ladder leg, while the output end of the second loading execution unit 330 abuts against the side of the step of the other ladder leg. When the push rod extends outward, the output end expands one ladder leg outward, and the reaction force acts on the other ladder leg through the sensor seat on the other side. The push rod expands both ladder legs outward to generate a test load, which is then transferred to the tension limiting device of the A-frame ladder through the ladder legs. The operation is convenient and safe. After the test is completed, the detection device can be removed from the A-frame ladder, the quick-connect cable can be unplugged, and the cable can be folded up for storage. The whole machine is lightweight and can be easily moved by a single person.

[0038] Please see Figures 1 to 6In one specific embodiment, during the tension limit test of the A-frame ladder, the operator quickly installs the tension limit detection device 300 onto the ladder and connects it to the control host 100, completing the preparation process quickly. After power-on self-test, the operator selects the "tension limit strength" test mode on the touch screen, and the system automatically matches the parameters of the DL / T 1476-2023 standard: force value 765N, speed 100mm / min, and pressure holding time 5min. After the ladder is in place, a one-click calibration is performed, and the system automatically completes zero-point identification and calibration. After the test is started, the system automatically loads, holds pressure, and releases force, without human intervention, and displays the force value and test curve in real time. During the pressure holding stage, if the tension limit device slips, breaks, or undergoes plastic deformation, it will cause the two ladder legs to open abnormally, and the force value will fluctuate or decrease accordingly. After the safety monitoring task detects this abnormality, it will immediately trigger the shutdown protection. After the pressure holding is completed, the system automatically interprets the result: if the tension limit device remains intact during the pressure holding period and does not break or undergo permanent deformation that affects its use, it is considered qualified. After the test, the system automatically determines that the test is qualified, generates a standard report of the force-displacement curve, stores it locally with encryption, and supports PDF export and WiFi upload to the management platform. Finally, the testing device is disassembled, the cables are bundled, and the entire unit is portable and portable.

[0039] Please see Figures 1 to 10 In an optional embodiment of the present invention, the horizontal strength testing device 400 is a complete loading platform, which includes a dedicated support, a crossbeam 410, a third base 420, a chassis 430, and a third loading execution unit 440. The dedicated support is set on the testing platform (ground) and includes a first support frame 450 and a second support frame 460, which are used to support the two ends of the rigid ladder to be tested, respectively. The main body of the first support frame 450 and the second support frame 460 is welded from steel pipes. The top is provided with a support rod for supporting the ladder beam, and the bottom is equipped with rolling elements and a locking mechanism. The rolling elements are universal rollers, which allow the operator to easily push the entire support to the designated position, solving the problem that the horizontal testing equipment is difficult to move due to its heavy weight. After reaching the target position, the locking mechanism's buckle pedal is stepped on, and the buckle makes tight contact with the roller and locks it, so that the support will not move during the loading process, realizing flexible switching between the three states of movement, temporary fixation, and locking.

[0040] Please see Figures 1 to 10In an optional embodiment of the present invention, the chassis 430 is mounted on the testing platform, located between the first support frame 450 and the second support frame 460, and is a frame structure welded from rectangular steel pipes. The third base 420 is fixed to the center of the chassis 430. Specifically, the crossbeam 410 is a metal beam of sufficient strength, placed horizontally above the two ladder beams of the rigid ladder. The third base 420 can be detachably fixed to the center of the chassis 430 by bolts or quick-release clips. The chassis 430 can be set perpendicular to the first support frame 450 and the second support frame 460, and both ends of the chassis 430 are respectively snapped into the first support frame. The bottom of the frame 450 and the second support frame 460 does not require additional fastening. The third base 420 serves as the base of the detection device and the push rod cover. The electric push rod assembly of the third loading execution unit 440 is vertically mounted on the third base 420. The dimensions of the third base 420 and the third loading execution unit 440 are designed in coordination with the height of the special bracket. A hook is provided in the center of the crossbeam 410. When the clamp is installed, the force-applying end of the push rod can be hung on the hook. After the detection is started, the hook is pulled down. A corresponding force detection unit 500 (not shown in the figure) is provided at the end of the electric push rod for real-time detection of the loading force.

[0041] After the detection is initiated, the control host 100 drives the push rod of the third loading execution unit 440 to apply a concentrated downward load to the ladder beam through the crossbeam 410. The crossbeam 410 and the rigid ladder bear downward tension. When the push rod pulls the crossbeam 410 downward, the push rod, the third base 420, and the chassis 430 are subjected to an upward reaction force. This reaction force is transmitted through both ends of the chassis 430 to the bottom of the support frames on both sides, thus forming a closed force loop between the chassis 430, the support frames, and the crossbeam 410. The entire system achieves self-balancing of forces and can maintain stability without relying on additional fixing mechanisms. This effectively prevents the chassis 430 from tipping over or tilting upward during loading, ensuring high stability of the system during loading and achieving tool-free assembly and convenient disassembly. The push rod continues to load until the standard specified force value is reached. The system automatically completes pressure holding and unloading, and the entire process is controlled by a closed loop to ensure the smoothness of loading and the accuracy of the force value. For rigid ladders of different lengths, the spacing between the first support frame 450 and the second support frame 460 on the testing platform can be flexibly adjusted. The length of the chassis 430 can also be selected according to the support frame spacing, or a telescopic structure can be adopted to adapt to ladders of different widths, ensuring versatility and adaptability. The chassis 430 frame and the bottom of the dedicated support can also be quickly fitted with a counterweight base, the weight of which can be increased or decreased according to test needs, ensuring the stability of the chassis 430, smooth push-rod pulling action, and accurate force loading. By internalizing the load into the structural design of the device itself, the reliance on heavy fixed foundations is reduced, facilitating on-site testing.

[0042] Please see Figures 1 to 10In an optional embodiment of the present invention, when performing horizontal strength testing, the operator first pushes the special bracket into place, places the rigid ladder to be tested horizontally, and places its two ends on the designated positions on the support rods at the top of the first support frame 450 and the second support frame 460, respectively. Then, the rollers are locked, and then the chassis 430 is installed under the third base 420. If necessary, a counterweight base is added to complete the load configuration. The chassis 430 is placed perpendicular to the two support frames, with its two ends respectively inserted into the bottom of the support frames. The crossbeam 410 is placed at the designated stress points of the two main side beams of the ladder, and the crossbeam 410 is connected to the output end of the push rod below. Finally, the quick-connect cable is inserted to complete the setup. The subsequent intelligent model selection, automatic calibration, closed-loop loading, real-time monitoring, intelligent interpretation of results, digital report generation, cloud upload, and lightweight storage processes are all consistent with the aforementioned embodiments, completing the testing process in a fully automated and standardized manner. After the test is initiated, the control host 100 drives the push rod of the third loading execution unit 440 to move, causing the crossbeam 410 to apply a concentrated vertical downward load to the ladder beam. During this process, a stable force loop is formed inside the testing device. By adopting the above-mentioned structural combination design, the heavy foundation is transformed into a movable reaction system, which not only solves the problem of difficult movement of bulky equipment, but also ensures the stability of the test loading. The push rod continues to load until the force value specified by the standard is reached. The system automatically completes pressure holding and unloading. The entire process is controlled by a closed loop to ensure the smoothness of loading and the accuracy of the force value.

[0043] Please see Figures 1 to 10 In an optional embodiment of the present invention, each detection module is an independent physical unit that can be stored in a toolbox. Each detection device has a handle on its base for easy removal from the toolbox. The base, loading execution unit, and extension arm are all detachably connected, allowing for disassembly and storage, significantly saving storage and transportation space. A unified quick-connect electrical interface is provided externally. This quick-connect interface integrates power supply lines, force sensor signal lines, and motor drive control lines. Operators only need to insert the quick-connect plug of any detection module into the corresponding socket on the control host 100 to complete the electrical connection, without the need for any tools or individual wiring. This highly modular "one machine, multiple detection modules" hardware architecture distributes the overall weight, allowing operators to carry only the control host 100 and the toolbox containing each detection module, significantly reducing the burden of carrying and transporting. The unified electrical interface also ensures the standardization and interchangeability of the detection system, effectively reducing equipment procurement and carrying costs. The main structure of the detection device is welded from aluminum alloy or high-strength steel pipes, meeting the requirements for lightweight design.

[0044] Please see Figures 1 to 10In an optional embodiment of the present invention, the bases of each testing fixture and the main load-bearing components such as each extension arm are all made of high-strength aluminum alloy sheet metal parts through bending and welding. This allows for the achievement of the load-bearing strength required for 0 to 2 kN test loads with a smaller wall thickness, while ensuring sufficient bending and torsional stiffness of the components. At the same time, it significantly reduces the self-weight of the parts and the amount of material used, providing key process support for the goal of lightweighting. Since the sheet metal parts are usually thin, directly tapping them results in very few effective thread turns, which can easily lead to stripping or thread failure during repeated disassembly and assembly. To achieve reliable detachable connections between the extension arm and the base, and between the push rod extension rod and the execution unit, rivet nuts are provided at the holes on each sheet metal part for installation and connection, forming a stable threaded connection point to ensure that the components can maintain a reliable tight connection after multiple on-site disassembly and assembly. Based on this reliable threaded connection, the extension arms and rods of each testing device can be quickly and manually screwed and disassembled without tools. After testing, each component can be disassembled and stored in the foam padding groove of a special toolbox, greatly reducing its size and achieving a unified modular storage and rapid on-site assembly.

[0045] Please see Figures 1 to 10 In an optional embodiment of the present invention, the control host 100 is internally configured with a parameter matching unit, an intelligent interpretation unit, and a data management unit. The parameter matching unit stores complete parameter data of at least one testing standard. In a specific embodiment, the power industry standard DL / T 1476-2023 is the primary standard, and it can also be expanded to store parameter libraries of other relevant standards. When the operator selects the testing mode (such as "step strength", "tension limiter strength" or "horizontal strength") and the rated load level of the ladder through the high-definition touch screen, the parameter matching unit automatically retrieves all loading parameters, such as the target force value, loading speed, and holding time specified in the corresponding standard, and displays them on the screen for the operator to confirm. It supports one-click confirmation or manual fine-tuning according to special needs, fundamentally eliminating the risk of manual table lookup and parameter input errors. The operation threshold is low, the consistency is good, and the efficiency is high.

[0046] Please see Figures 1 to 10In an optional embodiment of the present invention, the intelligent interpretation unit automatically runs after the detection process is completed. It has multiple preset judgment rules, formulated based on detection standards and engineering experience. These rules not only include basic judgments such as whether the force value meets the standard and whether the holding time is satisfied, but also perform in-depth analysis based on the morphological characteristics of the force-displacement curve. For example, if the curve shows an unexpected step-like drop during the holding stage, even if the final force value is barely within the acceptable range, the intelligent interpretation unit can still determine it as abnormal and mark a warning message in the report. This intelligent analytical capability is not available in traditional manual visual interpretation, effectively reducing human error. The data management unit begins recording all raw data collected by the force detection unit 500, as well as auxiliary information such as timestamps and loading speed, in real time when the detection starts. This data is encrypted and stored in local memory at millisecond-level frequency, supporting real-time recording of the test curve. After the detection is completed, the data management unit automatically integrates the equipment number, detection time, operator, applicable standard, complete force-displacement curve, raw data, and the detection conclusion output by the intelligent interpretation unit, generating a standardized, tamper-proof digital report according to a preset template. This report includes complete content such as basic information, raw data, force-displacement curves, judgment criteria, and test conclusions. It supports exporting to PDF files via USB interface, and can also be uploaded to the cloud-based safety tool management system with one click via the multi-mode wireless module (WiFi, 433MHz, or LoRa) built into the control host 100, achieving real-time synchronization and permanent archiving of test data from the field to the backend. The entire data process is authentic, complete, traceable, and tamper-proof, fully meeting the requirements for digital, standardized, and archival management of power safety tools, and can be connected to the test management system data interface.

[0047] Please see Figures 1 to 10 This invention also provides a portable rigid ladder testing method, which is implemented based on the testing device described in any of the foregoing embodiments. First, a portable rigid ladder testing device is provided, comprising a control host 100 and multiple testing devices. The testing devices include a runner testing device 200 for applying load to the runners of the rigid ladder, a tension limiting testing device 300 for applying load to the tension limiting device of an A-frame ladder, and a horizontal strength testing device 400 for applying load to the ladder beams of the rigid ladder. Each testing device includes a testing fixture and a loading execution unit and a force detection unit 500 mounted on the testing fixture. The operator selects the corresponding testing device from the runner testing device 200, tension limiting testing device 300, and horizontal strength testing device 400 according to the test item to be tested, and installs it on the rigid ladder to be tested. The entire preliminary preparation process is simple and efficient, including selecting and matching the corresponding testing device, quick docking and installation, and adjusting cable length, allowing for rapid readiness.

[0048] After the testing device is installed, the power to the control host 100 is turned on. The real-time operating system built into the control host 100 immediately starts running and executes control tasks and safety monitoring tasks in parallel. The equipment automatically completes a power-on self-test. The operator selects the testing mode corresponding to the current test via the touch screen. The control host 100 automatically matches the corresponding loading parameters from the built-in standard database according to the selected mode, including the target force value, loading speed, and holding time. After the operator confirms, the testing state can be entered. After clicking "Start Testing," the control task begins to run. Based on the preset loading parameters and the real-time detection values ​​fed back by the force detection unit 500, the output of the loading execution unit is adjusted using a PID closed-loop control algorithm to smoothly and accurately apply the test load to the rigid ladder through the testing device. The system achieves intelligent loading through closed-loop control, with gradual start and stop, and smooth operation. The force sensor collects data in milliseconds and displays the force value, speed, test curve, equipment status, and alarm information in real time. No manual operation is required throughout the process, and the holding and unloading of pressure can be completed automatically.

[0049] Throughout the testing process, the safety monitoring task operates independently of the control task, continuously monitoring the signal status of the force detection unit 500, whether the force value exceeds the limit, whether the limit switch is triggered, whether there is overcurrent, and whether the emergency stop button is pressed. If any abnormality is detected, a protective action is immediately triggered, such as cutting off the power output and issuing an alarm. This response is unaffected by the operating status of the control task, ensuring real-time and reliable safety protection. After the test is completed, the control task controls the loading execution unit to unload the force. The control host 100 automatically records and stores the test data generated throughout the entire testing process, including force value, displacement, time, loading speed, and complete force-displacement curves, providing complete raw data support for subsequent report generation and data analysis. After all tests are completed, the operator can easily disassemble the testing device, store the cables, and fold the bracket to put the equipment away. The entire machine is lightweight and can be easily moved and transported by a single person.

[0050] Please see Figures 1 to 10 In an optional embodiment of the present invention, when the operator selects the step strength detection mode on the touch screen, the first base 210 of the step clamp is taken out from the toolbox, the first extension arm 220 is screwed onto the end of the base, the extension rod is installed onto the end of the first loading execution unit 230, the quick-connect cable is plugged into the control host 100, and then the assembled step clamp is placed on two adjacent steps of the rigid ladder. The detection device is stably strung across by its own weight, so that the first loading execution unit 230 is located between the two steps. The installation can be completed without any tools. The whole setup process is simple and quick. During the test, one side of the step detection device 200 abuts against the top or bottom surface of one of the steps through the force application end (output end) of the push rod, and the other end of the detection device abuts against the opposite side of the other step.

[0051] When the tension limiting device strength testing mode is selected, take out the base of the tension limiting fixture from the toolbox, install the second extension arm 320 and the second loading execution unit 330, connect the quick-connect cable, place the assembled tension limiting fixture flat between the rungs of the left and right legs of the A-frame ladder, and position the second loading execution unit 330 between the two legs. Use its own weight to make the testing device horizontally suspended above the two legs. During testing, one side of the tension limiting testing device 300 abuts against one leg through the force application end of the second loading execution unit 330, and the other side of the testing device abuts against the opposite leg, ensuring that when the push rod extends outward, it can open the legs to both sides and transfer the load to the tension limiting device at the top of the A-frame ladder.

[0052] When selecting the horizontal strength testing mode, first push the dedicated bracket with universal casters to the testing station. Adjust the distance between the left and right brackets according to the ladder length. Support both ends of the rigid ladder on the two ends of the dedicated bracket and lock the dedicated bracket in place. Then, place the crossbeam 410 horizontally above the two ladder beams of the rigid ladder at the designated stress points. Next, install the chassis 430 below the third base 420. Place the chassis 430 and the third base 420 between the two support frames, ensuring that the chassis 430 is perpendicular to the two support frames, with both ends snapped into the bottom of the support frames. Connect the force-applying end of the third loading execution unit 440 to the crossbeam 410. After the testing device is set up, connect the quick-connect cables on the corresponding testing devices to the control host 100 and adjust the cable tension to complete the preliminary preparation. The installation methods of the above fixtures all achieve modular disassembly and storage and rapid on-site assembly, fully embodying the lightweight design concept.

[0053] It should be noted that all modules of the entire device can be stored in one or more dedicated toolboxes. The toolboxes are equipped with custom-molded foam padding, with corresponding grooves milled into the shape of each module to accommodate the control host 100, the step detection device 200, the tension detection device 300, the horizontal strength detection device 400, and various connecting accessories. The base body has a handle, allowing operators to easily lift and remove the required module with one hand after opening the toolbox. Each extension arm is threaded to the base; the end of the extension arm is machined with external threads, and the corresponding position on the base has an internal threaded hole. During installation, manual tightening is sufficient for reliable fixation without the need for any tools. The extension rod of the loading execution unit also uses a threaded interface or quick-release clip for detachable connection. This fully modular and fully detachable storage and assembly scheme minimizes the device's size during transportation and storage. A standard-sized toolbox can accommodate all detection modules, easily fitting into the trunk of an engineering vehicle or being carried into the confined space of an equipment room within a substation. At the work site, operators can complete the entire process from unpacking to assembly in just a few minutes, truly achieving the goal of lightweight design that allows for convenient storage and rapid deployment.

[0054] In summary, the portable rigid ladder testing equipment and method provided by this invention are systematically designed from three dimensions: hardware architecture, control method, and digital management, addressing the actual needs of on-site preventive testing of electric rigid ladders. In terms of hardware architecture, this invention adopts a modular design concept of "one machine with multiple detection modules," integrating the step detection device 200, tension limit detection device 300, and horizontal strength detection device 400 into three independent detection modules with dedicated functions. These modules are connected to the control host 100 via a unified quick-connect electrical interface, enabling tool-free rapid connection. Each detection module is equipped with electric push rods of different stroke specifications to adapt to varying displacement requirements. The total weight of the entire machine, including the battery, is controlled to around 30kg, allowing for single-person carrying and operation. The step detection device 200 and tension limit detection device 300 employ a "base + parallel double extension arm" straddle-type tool-free overlapping structure, utilizing the ladder's own geometry to form a stable opposing self-locking force system, achieving rapid deployment with "just place it on the ground." The horizontal strength detection device 400 adopts a "430-degree base snap-fit, closed-loop force self-balancing" structural design, ensuring loading stability without relying on a heavy foundation. The components of the testing device are connected by detachable methods such as screwing, and can be disassembled and stored in a dedicated toolbox when stored, achieving a balance between portable storage and rapid deployment.

[0055] In terms of control methods, the control host 100 of this invention is equipped with an RTOS real-time operating system and adopts a multi-task scheduling mechanism to run control tasks, sensing tasks, motor tasks, and safety monitoring tasks in parallel. The control task executes a PID closed-loop control algorithm with a millisecond cycle, and drives the electric actuator by outputting a PWM signal based on the target force value and real-time force feedback, achieving smooth loading with gradual start and stop and precise force value control. The safety monitoring task runs completely independently of the control task, monitoring various abnormal states in real time, such as abnormal signals from the force detection unit 500, force exceeding limits, overload, limit triggering, overcurrent, and emergency stop. The response is not blocked by the main program, ensuring the safety and reliability of the detection process. Combined with functions such as one-click model selection for automatic matching of standard parameters, one-click intelligent calibration, fully automatic loading, pressure holding and unloading, and intelligent result interpretation, the degree of manual intervention and the operational threshold are greatly reduced.

[0056] In terms of digital management, the control host 100 of this invention is equipped with a parameter matching unit, an intelligent interpretation unit, and a data management unit to realize full-process digital closed-loop management, from automatic matching of test parameters, millisecond-level acquisition of test data and real-time curve plotting, automatic judgment of test results, to automatic generation of standardized digital reports, local encrypted storage, and one-click upload to the cloud. The data is traceable and tamper-proof throughout the process, fully meeting the needs of digital, standardized, and archival management of power safety tools and equipment.

[0057] This invention achieves synergistic progress in three dimensions—portability, intelligence, and digitalization—through the coordinated use of the aforementioned hardware architecture, control methods, and digital management. It effectively solves problems such as bulky and inconvenient equipment handling, high dependence on manual operation, and lack of traceability of test data, providing a complete, efficient, and compliant comprehensive testing solution for on-site preventive testing of power elevators.

[0058] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0059] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

[0060] Throughout this specification, the terms "an embodiment," "embodiment," or "specific embodiment" refer to a particular feature, structure, or characteristic described in connection with an embodiment that is included in at least one embodiment of the invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the invention.

[0061] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0062] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0063] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0064] The above description of the embodiments shown in this invention (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the invention to the precise forms disclosed herein. Although specific embodiments and examples of the invention have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the invention, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the invention in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the invention.

[0065] This document has generally described the systems and methods in detail to aid in understanding the invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention can be practiced without one or more specific details, or using other means, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

[0066] Therefore, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the foregoing disclosure, and it should be understood that in some cases, certain features of the invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the invention will be defined only by the appended claims.

Claims

1. A portable rigid ladder testing device, characterized in that, include: Multiple testing devices, including a tread testing device for applying load to the treads of a rigid ladder, a tension testing device for applying load to the tension limiting device of an A-frame ladder, and a horizontal strength testing device for applying load to the beam of a rigid ladder. Each testing device includes a testing fixture and a loading execution unit and a force detection unit mounted on the testing fixture. A control host is configured to execute at least a control task and a safety monitoring task in parallel. The control task is used to control the loading execution unit to apply a test load to the rigid ladder based on target parameters and the detection value of the force detection unit. The safety monitoring task is used to monitor abnormal states and trigger protection actions, and the safety monitoring task operates independently of the control task.

2. The portable rigid ladder testing device according to claim 1, characterized in that, The testing fixtures include a step testing fixture, a tension testing fixture, and a horizontal strength testing fixture; The loading execution unit includes multiple execution sub-units, each with different stroke specifications. The step detection fixture, the tension limit detection fixture, and the horizontal strength detection fixture are integrated with their respective execution sub-units to form independent detection modules. Each of the detection modules is detachably connected to the control host via a unified quick-connect interface.

3. The portable rigid ladder testing device according to claim 1, characterized in that, The abnormal states monitored by the safety monitoring task include at least one of the following: abnormal force detection unit signal, force value exceeding the preset threshold, overload, travel limit trigger, current overcurrent, and emergency stop signal.

4. The portable rigid ladder testing device according to claim 1, characterized in that, The loading execution unit is an electric actuator, and the control task outputs a pulse width modulation signal to the electric actuator through PID closed-loop control.

5. The portable rigid ladder testing device according to claim 2, characterized in that, The step detection fixture includes a first base, and at least two parallel outward extending first extension arms are provided at the end of the first base. The first base and the first extension arms are straddling between two adjacent steps of the rigid ladder. The first loading execution unit is disposed at the bottom of the first base and is configured to abut between two steps to apply a test load to the steps of the rigid ladder.

6. The portable rigid ladder testing device according to claim 2, characterized in that, The tension limit detection device includes: The second base has at least two parallel outwardly extending second extension arms at its end, and the second base and the second extension arms are straddling the treads of the left and right ladder legs. The second loading execution unit is disposed at the bottom of the second base and is configured to abut between the two side ladder legs and to extend the ladder legs to apply a test load.

7. The portable rigid ladder testing device according to claim 2, characterized in that, The horizontal strength detection device includes: A special support bracket is set on the testing platform. The special support bracket includes a first support frame and a second support frame for supporting the two ends of the rigid ladder respectively. The bottom of the first support frame and the second support frame is provided with a rolling element and a locking mechanism. A crossbeam is used to be placed horizontally above the two ladder beams of a rigid ladder; The chassis is mounted on the testing platform and located between the first support frame and the second support frame; The third base is mounted on the chassis. The third loading execution unit is mounted on one end of the third base near the crossbeam and connected to the crossbeam. When the third loading execution unit is activated, it drives the crossbeam to apply a vertically downward concentrated load to the ladder beam of the rigid ladder.

8. The portable rigid ladder testing device according to claim 1, characterized in that, The control host is also equipped with a parameter matching unit, an intelligent interpretation unit, and a data management unit; The parameter matching unit stores parameter data of at least one detection standard, which is used to automatically match the corresponding loading parameters according to the detection mode selected by the user. The loading parameters include at least the target force value, loading speed and holding time. The intelligent interpretation unit is used to automatically output the detection conclusion according to the preset judgment rules after the detection is completed; The data management unit is used to record and store the test data generated during the testing process in real time, and automatically generate a test report based on the test data and the test conclusions. The data management unit is configured to export the test report and / or upload it to an external device via wireless communication.

9. A portable method for detecting rigid ladders, characterized in that, include: A portable rigid ladder testing device is provided, which includes a control host and multiple testing devices. The testing devices include a tread testing device for applying load to the treads of the rigid ladder, a tension testing device for applying load to the tension limiting device of the A-frame ladder, and a horizontal strength testing device for applying load to the beam of the rigid ladder. Each testing device includes a testing fixture and a loading execution unit and a force detection unit mounted on the testing fixture. Based on the test items to be tested, select the corresponding testing device from multiple testing devices and install it in place; The control host is started, and the control host runs at least two tasks in parallel: control tasks and security monitoring tasks. When a detection mode is selected, the control host automatically matches the corresponding loading parameters based on the selected mode. After the test begins, the control task controls the loading execution unit to apply a test load to the rigid ladder based on the loading parameters and the detection value of the force detection unit. The security monitoring task runs independently of the control task, monitors abnormal states in real time, and triggers protective actions when an abnormality is detected. The control host records and stores the test data generated during the testing process, and controls the loading execution unit to unload the force after the test is completed.

10. The portable rigid ladder detection method according to claim 9, characterized in that, The step of selecting a corresponding testing device from multiple testing devices based on the test item to be tested, and installing it in place, includes: When selecting step strength testing, select a step testing device, place the step testing device on two adjacent steps of the rigid ladder, and position the first loading execution unit between the two steps. When selecting the tension limiting device strength test, select the tension limiting detection device, place the tension limiting detection device flat between the treads of the left and right legs of the A-frame ladder, and position the second loading execution unit between the two legs. When selecting horizontal strength testing, a horizontal strength testing device is selected, and the two ends of the rigid ladder are respectively supported on the two ends of a special bracket. The crossbeam is placed horizontally above the two ladder beams of the rigid ladder, and one end of the third loading execution unit is connected to the crossbeam.

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