Hand-held elevator door lock engagement depth detection device
This elevator door lock detection device, which integrates a rigid reference ruler, a movable ruler, a guiding and resetting mechanism, a limit switching mechanism, a micro-detection unit, and a current detection unit, solves the problem of high-efficiency screening and high-precision diagnosis in elevator door lock detection. It achieves rapid and safe identification and accurate measurement, and is suitable for elevator door lock detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-07
- Publication Date
- 2026-04-03
AI Technical Summary
Existing elevator door lock detection methods cannot simultaneously meet the dual requirements of high-efficiency screening and high-precision diagnosis. Traditional mechanical measuring methods are cumbersome to operate and rely on human judgment, while high-precision laser rangefinders are expensive and not portable, and cannot achieve rapid automatic identification.
A handheld elevator door lock engagement depth detection device was designed, integrating a rigid reference ruler, a movable ruler, a guiding and resetting mechanism, a limit switching mechanism, a micro-detection unit, a current detection unit, and a main control unit. It adopts non-contact magnetic field sensing technology and high-precision laser ranging to achieve switching between rapid discrimination mode and precise measurement mode.
It achieves efficient and convenient door lock testing, and can simultaneously detect mechanical engagement depth and electrical circuit status under one-handed operation. It has rapid screening and accurate measurement functions, improving testing efficiency and accuracy, and is suitable for AC and DC door lock circuits.
Smart Images
Figure CN121782967A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of elevator door lock detection technology, specifically a handheld elevator door lock engagement depth detection device. Background Technology
[0002] In elevator inspection and testing, the engagement depth of the door lock is a key parameter to ensure that it will not be accidentally opened when locked. The "Elevator Supervision and Periodic Inspection Rules" (TSG T7001-2023) and the "Elevator Self-Inspection Rules" (TSGT7008-2023) stipulate that the car (carrying device) can only be started when the locking element is engaged by at least 7mm, and each landing door and car door (if any) should be inspected. Therefore, developing a device and method that can accurately, quickly, and conveniently detect the door lock engagement depth and circuit connection sequence is of significant practical importance.
[0003] Currently, there are two main technical solutions for testing this project. The first is the traditional mechanical measuring tool method, where inspectors typically use general-purpose tools such as vernier calipers or depth gauges for manual measurement and estimation. This method is not only cumbersome and inefficient, but also heavily relies on the inspector's experience and visual judgment, resulting in large human reading errors, poor repeatability, and an inability to intuitively and synchronously determine the on / off state of the door lock circuit at a specific engagement depth.
[0004] The second category is measurement methods based on high-precision laser rangefinders. While this method enables non-contact measurement and improves accuracy to some extent, the equipment is typically expensive, and to achieve circuit continuity testing, it still requires additional electrical instruments such as multimeters, and requires two inspectors to operate in tandem. The entire system has low integration and poor portability, and cannot achieve rapid, automatic "one-click" identification, making it difficult to widely apply in fast-paced on-site inspection work.
[0005] Since a single elevator typically has multiple or even dozens of door locks that need to be inspected, there is still a contradiction between technology and efficiency when facing a large number of high-frequency door lock inspection needs on site: if rapid screening is pursued, it is impossible to accurately measure and locate the faults of suspected unqualified door locks; if accurate measurement is pursued, complex and inefficient combination of separate equipment will inevitably be used, resulting in a significant reduction in efficiency.
[0006] Therefore, there is an urgent need for a dedicated testing device that can flexibly switch between rapid discrimination mode and precise measurement mode in a highly integrated device according to the different stages of on-site inspection. This would enable efficient and rapid screening in rapid discrimination mode, and precise measurement mode for accurate measurement and fault location of suspected non-conforming door locks when necessary.
[0007] The present invention aims to solve the technical problem of how to integrate the above two working modes to simultaneously meet the dual requirements of high-efficiency screening and high-precision diagnosis for on-site inspection of elevator door locks. Summary of the Invention
[0008] The technical problem that this invention aims to solve is that current elevator door lock detection methods cannot simultaneously meet the dual requirements of high-efficiency screening and high-precision diagnosis in on-site elevator door lock inspection.
[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A handheld elevator door lock engagement depth detection device includes a rigid reference ruler 10, a movable ruler 20, a guiding and resetting mechanism 30, a limit switching mechanism 40, a micro-detection unit 50, a current detection unit 60, and a main control unit 100. The rigid reference ruler 10 and the movable ruler 20 are arranged side by side, and the rigid reference ruler 10 is fixed on the handheld housing 1. The fixed end of the movable ruler 20 extends into the handheld housing 1 and is connected to the guide and reset mechanism 30. The limit switching mechanism 40 is located on one side of the handheld housing 1 and is used to limit the displacement of the guide and reset mechanism 30 to achieve the switching between the rapid discrimination mode and the precise measurement mode. The macro detection unit 50 is located in the handheld housing 1 and is used to accurately detect the displacement of the guide and reset mechanism 30; the current detection unit 60 is used to detect the on / off state of the door lock circuit in a non-contact manner; the main control unit 100 is communicatively connected to the macro detection unit 50 and the current detection unit 60.
[0010] In one embodiment of the present invention, the guiding and resetting mechanism 30 includes a movable end plate 31, a fixed base plate 32, a linear bearing 33 and a reset spring 34; the reset spring 34 is sleeved on the linear bearing 33; the two ends of the linear bearing 33 are respectively fixed on the movable end plate 31 and the fixed base plate 32, and the fixed base plate 32 is fixed inside the handheld housing 1.
[0011] In one embodiment of the present invention, the fixed end of the movable ruler 20 is fixed to the movable end plate 31; and the return spring 34 is used to ensure that the rigid reference ruler 10 and the horizontal end of the movable ruler 20 remain at the same height when there is no external force.
[0012] In one embodiment of the present invention, the sensor head of the macro detection unit 50 is fixed on the fixed base plate 32, and the laser emission point is aligned with the lower surface of the movable end plate 31, which can measure the distance change between the movable end plate 31 and the fixed base plate 32 in real time and transmit the measured data to the main control unit 100.
[0013] In one embodiment of the present invention, the limit switching mechanism 40 includes a movable stop 41 and a lever 42; the lever 42 is located on one side of the handheld housing 1 and is connected to the movable stop 41, and is used to switch the position of the movable stop 41 so that the movable stop 41 is in position one or position two.
[0014] In one embodiment of the present invention, when the lever 42 is turned to the "fast" position, the movable stop 41 moves to position one. At this time, the upper protrusion of the movable stop 41 is on the displacement stroke path of the guide and reset mechanism 30 to prevent the movable end plate 31 from continuing to descend beyond the elevator detection rule standard threshold. When lever 42 is moved to the "precise" position, movable stop 110 moves to position two, the upper protrusion of movable stop 41 moves away, and movable end plate 31 can descend to the mechanical limit of linear bearing 33.
[0015] In one embodiment of the present invention, the magnetic field induction probe 61 of the current detection unit 60 is connected to the main control unit 100 via a cable 62.
[0016] In one embodiment of the present invention, both the rigid reference ruler 10 and the movable ruler 20 are "L" shaped, and the thickness of their horizontal ends is the same, and they are at the same height when not in a test state.
[0017] In one embodiment of the present invention, the method of using the detection device includes: Step S1: Mode selection; Select the working mode: quick judgment mode or precise measurement mode, and manually adjust the movable stop 41 to the position one or position two corresponding to the selected mode according to the selected mode; Step S2: Device installation and simulated engagement; With one hand, open the movable hook of the elevator door lock, and with the other hand, hold the detection device and reliably hook the horizontal end 11 of the rigid reference ruler 10 onto the fixed hook of the door lock and keep it horizontal; then, slowly release the movable hook so that it falls naturally and presses against the movable ruler 20, causing the movable ruler 20 to move downward, converting the engagement depth of the hook into the displacement of the movable ruler 20. Step S3: Synchronous detection and logical judgment; During the process of the movable locking hook lowering the movable ruler 20, the main control unit 100 synchronously performs the following operations: The displacement of the movable ruler 20, which represents the engagement depth of the elevator door lock, is monitored in real time by the micro-detection unit 50. The magnetic field induction probe 61 of the current detection unit 60 is placed next to the electrical circuit wire of the elevator door lock to monitor the changes in the magnetic field generated by the current in the electrical circuit of the elevator door lock in real time in a non-contact manner. The judgment logic is as follows: When in rapid judgment mode, it is determined whether the elevator door lock electrical circuit is connected before the displacement of the movable ruler 20 reaches the standard threshold of the elevator inspection rules; if so, it is judged as unqualified. When in precise measurement mode, the moment when the elevator door lock electrical circuit changes from open to closed is captured, and the displacement at this moment is recorded as the elevator door lock engagement depth value.
[0018] In one embodiment of the present invention, the process of determining whether the elevator door lock electrical circuit is connected by the current detection unit 60 includes: Acquire the instantaneous output voltage value of the current detection unit 60; Calculate the absolute difference between the instantaneous output voltage value and the reference voltage value; When the absolute difference exceeds a preset voltage threshold, the elevator door lock electrical circuit is determined to be connected.
[0019] Compared with the prior art, the beneficial effects of the present invention are: Extremely high detection efficiency and reliability: The rapid discrimination mode achieves ultimate efficiency with "one click and release, results in seconds"; the precise measurement mode can accurately capture the critical point of circuit connection. The differential threshold method is used to determine magnetic field jumps, effectively suppressing environmental interference and ensuring objective and accurate interpretation results.
[0020] Feature-rich and versatile: A single device provides both rapid security screening and precise data analysis. Its non-contact detection solution makes it applicable to both AC and DC door lock circuits, offering excellent versatility.
[0021] High integration and ultimate portability: Mechanical measurement, micro-sensing, magnetic field detection and intelligent control are highly integrated into a single handheld housing. Combined with an efficient power management solution, the testing equipment is made "integrated" and "pocket-sized", perfectly supporting one-handed operation.
[0022] Non-destructive testing: Employing non-contact current detection technology based on the A1363 linear Hall sensor, it eliminates the need to disconnect or connect any door lock circuit wires, simplifying the testing operation to "just get close," greatly improving safety and convenience, and representing a significant advancement in on-site testing methods.
[0023] This invention overcomes the shortcomings of existing elevator door lock detection technologies, such as poor portability, cumbersome operation, and the inability to simultaneously and accurately interpret geometric quantities and electrical signals without disconnecting the circuit. It provides a highly integrated, handheld method and device for detecting the engagement depth of elevator door locks. Its core objective is to provide a highly integrated, handheld elevator door lock engagement depth detector capable of simultaneously and automatically detecting the mechanical engagement depth and electrical circuit continuity of the door lock. The core innovation of the device lies in employing non-contact magnetic field sensing technology to detect the circuit status, combined with high-precision laser ranging and an intelligent limit mechanism, achieving both rapid safety judgment and precise numerical measurement modes, meeting the high standards of portability, efficiency, and accuracy required for on-site inspection. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of a handheld elevator door lock engagement depth detection device according to an embodiment of the present invention.
[0025] Figure 2 This is a schematic diagram of the internal structure of the detection device according to an embodiment of the present invention.
[0026] Figure 3 This is a circuit system block diagram of the detection device according to an embodiment of the present invention.
[0027] Figure 4 This is a flowchart illustrating the rapid discrimination mode in an embodiment of the present invention.
[0028] Figure 5 This is a flowchart of the precise measurement mode according to an embodiment of the present invention. Detailed Implementation
[0029] To facilitate understanding of the technical solution of the present invention by those skilled in the art, the technical solution of the present invention will now be further described in conjunction with the accompanying drawings.
[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0031] Please see Figure 1 and Figure 2 As shown, the present invention provides a handheld elevator door lock engagement depth detection device, including a rigid reference ruler 10, a movable ruler 20, a guiding and resetting mechanism 30, a limit switching mechanism 40, a micro-detection unit 50, a current detection unit 60, and a main control unit 100.
[0032] The rigid reference ruler 10 and the movable ruler 20 are arranged side by side, and the rigid reference ruler 10 is fixed on the handheld housing 1. The fixed end of the movable ruler 20 extends into the handheld housing 1 and is connected to the guide and reset mechanism 30. The limit switching mechanism 40 is located on one side of the handheld housing 1 and is used to limit the displacement of the guide and reset mechanism 30 to achieve the switching between the rapid discrimination mode and the precise measurement mode.
[0033] The macro detection unit 50 is located in the handheld housing 1 and is used to accurately detect the displacement of the guide and reset mechanism 30. The current detection unit 60 is used to detect the on / off state of the door lock circuit in a non-contact manner; the main control unit 100 is communicatively connected to the macro detection unit 50 and the current detection unit 60.
[0034] In one embodiment of the present invention, the handheld housing 1 is made of ABS engineering plastic and has an internal mounting frame to facilitate the installation of components located within the housing. Furthermore, the handheld housing 1 is ergonomically designed.
[0035] In one embodiment of the present invention, the rigid reference ruler 10 is mainly an L-shaped ruler body made of stainless steel, with its vertical portion fixed to the upper part of the handheld housing 1 by screws, and its horizontal end 11 extending forward horizontally. The movable ruler 20 is also an L-shaped stainless steel ruler body, arranged side by side with the rigid reference ruler 10, with its vertical bottom end fixed to a movable end plate 31 made of aluminum alloy by screws. Furthermore, the horizontal end 11 of the rigid reference ruler 10 and the horizontal end 21 of the movable ruler 20 have the same thickness, and in the non-detection state, their horizontal ends are at the same height.
[0036] In one embodiment of the present invention, the guiding and resetting mechanism 30 includes a movable end plate 31, a fixed base plate 32, a linear bearing 33, and a reset spring 34. The reset spring 34 is sleeved on the linear bearing 33, and both ends of the linear bearing 33 are respectively fixed to the movable end plate 31 and the fixed base plate 32, with the fixed base plate 32 fixed inside the handheld housing 1. The reset spring 34 ensures that the horizontal ends of the rigid reference ruler 10 and the movable ruler 20 remain at the same height when there is no external force. Specifically, the diameter of the linear bearing 33 is 6 mm.
[0037] In one embodiment of the present invention, the limit switching mechanism 40 includes a movable stop 41 and a lever 42. The lever 42 is located on one side of the handheld housing 1 and is connected to the movable stop 41, used to switch the position of the movable stop 41, so that the movable stop 41 is in position one or position two. Specifically, the movable stop 41 and the lever 42 are rigidly connected, with a hole at the connection point, and are fixed to the mounting base 43 by a miniature pin. The mounting base 43 is fixed to one side of the housing, so that the movable stop 41 and the lever 42 can rotate as a whole along the miniature pin at the fixed point. Moving the lever 42 to both sides causes the movable stop 41 to be in position one or position two.
[0038] In this embodiment, when the lever 42 is moved to the "fast" position, the movable stop 41 moves to position one. At this time, the upper protrusion of the movable stop 41 is on the displacement travel path of the guide and reset mechanism 30, so as to prevent the movable end plate 31 from continuing to descend beyond the elevator detection rule standard threshold. In this embodiment, the elevator detection rule standard threshold is 7mm.
[0039] When lever 42 is moved to the "Precision" position, movable stop 110 moves to position two, the upper protrusion of movable stop 41 moves away, and movable end plate 31 can descend to the mechanical limit of linear bearing 33. Specifically, the mechanical limit of linear bearing 33 is approximately 25mm.
[0040] In one embodiment of the present invention, the macro detection unit 50 employs a Keyence IL-065 laser displacement sensor. The sensor head of the laser displacement sensor is fixed to the base plate 32 via a mounting bracket, and the laser emission point is precisely aligned with a frosted, flat area on the lower surface of the movable end plate 31. Through holes are provided in the base plate 32 to prevent obstruction of the laser sensor's signal transmission and reception. Specifically, the sensor operates at 12V, and its analog output (0-5V) is connected to the ADC1 pin of the STM32F411 main control chip.
[0041] In one embodiment of the present invention, the core sensor of the current detection unit 60 is an Allegro A1363LLUTR-1-T linear Hall effect sensor, which is soldered together with a 100nF decoupling capacitor onto a small PCB board. This PCB board is encapsulated in a plastic probe housing, the head of which is marked with a sensing surface, forming a magnetic field sensing probe 61. The magnetic field sensing probe 61 is connected to the host computer via a cable 62 approximately 50cm long, with the signal line connected to the ADC2 pin of the main control chip. Specifically, the cable 62 uses a four-core shielded corrugated tube containing 5V, GND, and signal lines.
[0042] Please see Figures 1 to 3 As shown, in one embodiment of the present invention, the detection device further includes a power supply unit 70. The power supply unit 70 uses a 703450 lithium polymer battery (BAT1) with a nominal voltage of 3.7V and a capacity of 1200mAh as the total power source. The power supply unit 70 also uses a TI TPS61093 synchronous boost converter to boost the battery voltage to a stable 12V to power the macro detection unit. A TI TPS62090 synchronous buck converter is used to convert the battery voltage to a stable 5V. An ST LD39080 LDO chip is used to convert the 5V voltage to a stable 3.3V to power the main control unit (100), the touchscreen logic circuit, and the buzzer.
[0043] In one embodiment of the present invention, the main control unit 100 uses STMicroelectronics' STM32F411CEU6 microcontroller as its core as the main control chip 110. It is mounted on the main control PCB board 120 inside the handheld housing and connects to peripherals through its rich I / O interfaces.
[0044] In one embodiment of the present invention, the detection device further includes a human-machine interaction unit. The human-machine interaction unit mainly includes a touchscreen 81 and a buzzer 82. The touchscreen 81 is a 2.0-inch TFT LCD capacitive touchscreen with a resolution of 240x320, connected to the main control PCB board 120 via an FPC cable, and communicates with the main control chip 110 using an SPI interface. The buzzer 82 is a 5V active buzzer, driven by the GPIO pin of the main control chip 110 through an S8050 transistor.
[0045] Please see Figures 1 to 5 As shown, in one embodiment of the invention, the method of using the detection device includes: System power-on and initialization: When the user turns on the power switch, the main control unit 100 starts up, and the touch screen 81 displays the main interface. The main control chip 110 reads the initial value of the macro detection unit 50 and stores it as the reference distance L0. At the same time, the main control chip 110 collects the output voltage of the current detection unit 60, takes the average value within one second, and stores it as the magnetic field reference value V_base.
[0046] Implementation process of rapid discrimination mode: The user selects the "Quick Discrimination" mode via the touch screen 81 and moves the lever 42 to the "Quick" position (the active stop 41 is in position one).
[0047] The inspector opens the elevator door lock with one hand and holds the testing device with the other. The horizontal end 11 of the rigid reference ruler 10 is reliably hooked onto the fixed hook of the door lock and kept horizontal. Then, the movable hook is slowly released so that it presses against the horizontal end 21 of the movable ruler 20 and compresses the movable ruler 20 downward.
[0048] During the compression process, the main control chip 110 continuously executes: a) Read the micro-detection unit 50 and calculate the real-time displacement D=L0-L_current.
[0049] b) Calculate the absolute difference |ΔV|=|V_current-V_base| based on the voltage V_current output by the current detection unit 60.
[0050] The main control chip 110 continuously determines whether the absolute difference |ΔV| exceeds the preset voltage threshold V_threshold (for example, the magnetic field change corresponding to a 50mA current) before the displacement D reaches the standard threshold of the elevator detection rules (7mm + the thickness of the horizontal end 21 of the movable ruler 20 in this embodiment).
[0051] If the displacement D is less than the standard threshold of the elevator inspection rules, and |ΔV| > V_threshold, then the main control chip 110 will immediately drive the buzzer 82 to sound a continuous alarm and display "Unqualified: Circuit connected too early" on the screen.
[0052] If |ΔV| does not exceed the threshold until the movable ruler 20 reaches the "elevator inspection rule standard threshold", then the buzzer 82 will not sound; the detection device can be removed and the next door lock can continue to be tested in the quick judgment mode until the quick judgment result is unqualified, or the quick judgment mode can be manually exited.
[0053] Implementation process of precise measurement mode: The user selects the precise measurement mode via the touchscreen 81 and moves the lever 42 to the "precise" position (the movable stop 41 is in position two).
[0054] Install the detector and release the active locking hook in the same manner as in the quick discrimination mode.
[0055] During the compression process, the main control chip 110 synchronously samples the displacement D and |ΔV| at high speed.
[0056] When the main control chip 110 detects that |ΔV| exceeds the voltage threshold V_threshold for the first time, it immediately triggers an interrupt. In this interrupt service routine, it "freezes" and records the displacement data D=L0-L_current at this moment.
[0057] The main control chip 110 calculates D_trigger = D - the thickness of the horizontal end 21 of the movable ruler 20, and finally displays "Door lock engagement depth: D_trigger mm" on the touch screen 81. At the same time, the buzzer 82 beeps briefly to indicate that the measurement is complete.
[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.
[0059] The above embodiments are merely examples of implementation methods of the invention. The scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.
Claims
1. A handheld elevator door lock engagement depth detection device, characterized in that, It includes a rigid reference ruler (10), a movable ruler (20), a guiding and resetting mechanism (30), a limit switching mechanism (40), a micro-detection unit (50), a current detection unit (60), and a main control unit (100). The rigid reference ruler (10) and the movable ruler (20) are arranged side by side, and the rigid reference ruler (10) is fixed on the handheld housing (1). The fixed end of the movable ruler (20) extends into the handheld housing (1) and is connected to the guide and reset mechanism (30). The limit switching mechanism (40) is located on one side of the handheld housing (1) and is used to limit the displacement of the guide and reset mechanism (30) to achieve the switching between the rapid discrimination mode and the precise measurement mode. The macro detection unit (50) is located in the handheld housing (1) and is used to accurately detect the displacement of the guide and reset mechanism (30); the current detection unit (60) is used to detect the on / off state of the door lock circuit in a non-contact manner; the main control unit (100) is connected to the macro detection unit (50) and the current detection unit (60) in communication.
2. The handheld elevator door lock engagement depth detection device according to claim 1, characterized in that, The guiding and resetting mechanism (30) includes a movable end plate (31), a fixed base plate (32), a linear bearing (33), and a reset spring (34); the reset spring (34) is sleeved on the linear bearing (33); the two ends of the linear bearing (33) are respectively fixed on the movable end plate (31) and the fixed base plate (32), and the fixed base plate (32) is fixed inside the handheld housing (1).
3. The handheld elevator door lock engagement depth detection device according to claim 2, characterized in that, The fixed end of the movable ruler (20) is fixed to the movable end plate (31); and the return spring (34) is used to ensure that the rigid reference ruler (10) and the horizontal end of the movable ruler (20) remain at the same height when there is no external force.
4. The handheld elevator door lock engagement depth detection device according to claim 2, characterized in that, The sensor head of the micro-detection unit (50) is fixed on the fixed base plate (32), and the laser emission point is aligned with the lower surface of the movable end plate (31). It can measure the distance change between the movable end plate (31) and the fixed base plate (32) in real time and transmit the measured data to the main control unit (100).
5. The handheld elevator door lock engagement depth detection device according to claim 2, characterized in that, The limit switching mechanism (40) includes a movable stop (41) and a lever (42); the lever (42) is located on one side of the handheld housing (1) and connected to the movable stop (41), and is used to switch the position of the movable stop (41) so that the movable stop (41) is in position one or position two.
6. The handheld elevator door lock engagement depth detection device according to claim 5, characterized in that, When the lever (42) is moved to the "fast" position, the movable stop (41) moves to position one. At this time, the upper protrusion of the movable stop (41) is on the displacement stroke path of the guide and reset mechanism (30) to prevent the movable end plate (31) from continuing to descend beyond the standard threshold of the elevator detection rules. When the lever (42) is moved to the "precise" position, the movable stop (110) moves to position two, the upper protrusion of the movable stop (41) moves away, and the movable end plate (31) can descend to the mechanical limit of the linear bearing (33).
7. The handheld elevator door lock engagement depth detection device according to claim 1, characterized in that, The magnetic field induction probe (61) of the current detection unit (60) is connected to the main control unit (100) via a cable (62).
8. The handheld elevator door lock engagement depth detection device according to claim 1, characterized in that, Both the rigid reference ruler (10) and the movable ruler (20) are "L" shaped, and the thickness of their horizontal ends is the same, and they are at the same height when not in the test state.
9. The handheld elevator door lock engagement depth detection device according to claim 5, characterized in that, The methods for using the detection device include: Step S1: Mode selection; Select the working mode: quick judgment mode or precise measurement mode, and manually adjust the active stop (41) to the position one or position two corresponding to the selected mode according to the selected mode; Step S2: Device installation and simulated engagement; With one hand, open the movable hook of the elevator door lock, and with the other hand, hold the detection device and reliably hook the horizontal end (11) of the rigid reference ruler (10) onto the fixed hook of the door lock and keep it horizontal; then, slowly release the movable hook so that it falls naturally and presses against the movable ruler (20), causing the movable ruler (20) to move downward, converting the engagement depth of the hook into the displacement of the movable ruler (20); Step S3: Synchronous detection and logical judgment; During the process of the movable locking hook lowering the movable ruler (20), the main control unit (100) simultaneously performs the following operations: The displacement of the elevator door lock engagement depth is characterized by the moving ruler (20) monitored in real time by the micro-detection unit (50). The magnetic field induction probe (61) of the current detection unit (60) is placed next to the electric circuit wire of the elevator door lock to monitor the magnetic field changes generated by the current in the electric circuit of the elevator door lock in real time in a non-contact manner. The judgment logic is as follows: When in rapid judgment mode, determine whether the elevator door lock electrical circuit is connected before the displacement of the movable ruler (20) reaches the standard threshold of the elevator inspection rules; if so, it is judged as unqualified. When in precise measurement mode, the moment when the elevator door lock electrical circuit changes from open to closed is captured, and the displacement at this moment is recorded as the elevator door lock engagement depth value.
10. The handheld elevator door lock engagement depth detection device according to claim 9, characterized in that, The process of determining whether the elevator door lock electrical circuit is connected by the current detection unit (60) includes: Acquire the instantaneous output voltage value of the current detection unit (60); Calculate the absolute difference between the instantaneous output voltage value and the reference voltage value; When the absolute difference exceeds a preset voltage threshold, the elevator door lock electrical circuit is determined to be connected.