A device for detecting missing steps on an automated walkway

Abstract

This utility model relates to the field of moving walkway technology, specifically to a device for detecting missing steps on moving walkways. It includes a first missing step sensor and a second missing step sensor installed behind the steps of an escalator. The first and second missing step sensors are installed in series, and the distance between them is less than the distance between two shafts following the same step. This invention uses a dual proximity switch signal series connection to achieve signal AND functionality, shielding some pulse signals and enabling the acquisition and judgment of missing step detection pulses. It solves the problem, in a simple way, that moving walkways with shaft-connected steps in large lifting staircases cannot monitor missing steps.

Description

Technical Field

[0001] This utility model relates to the field of automatic walkway technology, specifically to an automatic walkway step missing detection device. Background Technology

[0002] With the implementation of the new elevator inspection standard TSG T7001-2023, and the frequent incidents of injuries and fatalities caused by missing steps on older escalators and moving walkways built before 2011, the installation of missing steps on older escalators and moving walkways has become an increasingly important issue. However, there are technical challenges in installing missing steps on older moving walkways. Existing step-missing detection technologies primarily rely on proximity switches to detect the ridges on the back of the steps and use pulse counting to determine if a step is missing.

[0003] like Figure 1 and Figure 2 As shown, A is the escalator missing detection switch, and B is the escalator step. It can be seen that each escalator step B has only one edge D. Combined with... Figure 4 and Figure 5 It can be seen that after the escalator starts running, step B passes by the escalator missing detection switch A in sequence. When step D passes by, the escalator missing detection switch detects it and generates a pulse. The safety monitoring board monitors the proximity switch signal in real time, and if... Figure 2 When the step is missing as shown, the pulse signal is as follows: Figure 5 If one pulse is missing, the safety monitoring board will detect this and stop the device, reporting a fault.

[0004] The difference between moving walkway steps and escalator steps is that... Figure 6 He Ru Figure 7 As shown, step B consists of two ribs D. Step B is mounted on shaft E. Therefore, when the pedestrian walkway is near the missing detection switch C, as... Figure 7 As shown, since the shaft is still present when step B is removed, as... Figure 8 and Figure 9 As shown, when the ladder is missing, the pulse does not... Figure 5 The problem is that while there are still missing steps, the pulses become narrower, so the system safety monitoring board cannot determine the missing steps based on the pulse count and therefore cannot report a fault. Consequently, the single proximity switch solution is ineffective. Therefore, it is extremely important to invent a missing step detection device for automatic walkways with lifting chains and shafts. Utility Model Content

[0005] The purpose of this invention is to provide a reasonably designed automatic pedestrian walkway step missing detection device that addresses the defects and shortcomings of the existing technology, thereby solving the aforementioned deficiencies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: it includes a step missing sensor 1 and a step missing sensor 2 installed behind the steps of the escalator. The step missing sensor 1 and the step missing sensor 2 are installed in series, and the distance between the step missing sensor 1 and the step missing sensor 2 is less than the distance between the two shafts behind the same step.

[0007] Preferably, the positive and negative terminals of the first step-missing sensor and the positive terminal of the second step-missing sensor are respectively connected to the power supply port, the output terminal of the first step-missing sensor is connected to the negative terminal of the second step-missing sensor, and the output terminal of the second step-missing sensor is connected to the input port of the safety monitoring board.

[0008] Preferably, both the first step-missing sensor and the second step-missing sensor are NPN type proximity switches.

[0009] Preferably, the positive and negative terminals of the first step missing sensor and the negative terminal of the second step missing sensor are respectively connected to the power supply port, the output terminal of the first step missing sensor is connected to the positive terminal of the second step missing sensor, and the output terminal of the second step missing sensor is connected to the input port of the safety monitoring board.

[0010] Preferably, both the first and second step-missing sensors are PNP type proximity switches.

[0011] The beneficial effects of this utility model after adopting the above structure are:

[0012] This invention uses a dual proximity switch signal series connection to achieve the signal AND function, shielding some pulse signals and realizing the acquisition and judgment of missing step detection pulses. It solves the problem that the automatic walkway steps connected by shafts in large lifting step chains cannot monitor missing step phenomena in a simple way. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the existing escalator step missing detection principle (under normal conditions);

[0014] Figure 2 This is a schematic diagram of the existing escalator step missing detection principle (when a step is missing);

[0015] Figure 3 This is a schematic diagram of the electrical principle for detecting missing steps on existing escalators;

[0016] Figure 4 This is a timing diagram of an existing escalator (when the steps are normal);

[0017] Figure 5 This is a timing diagram of an existing escalator (when steps are missing);

[0018] Figure 6 This is a schematic diagram of an existing moving walkway system (when the steps are normal).

[0019] Figure 7 This is a schematic diagram of an existing moving walkway scheme (when steps are missing);

[0020] Figure 8 This is a timing diagram of an existing moving walkway system (when the steps are normal).

[0021] Figure 9 This is a sequence diagram of an existing moving walkway scheme (when steps are missing);

[0022] Figure 10 This is a schematic diagram of the automatic walkway scheme (when the steps are normal) in this utility model;

[0023] Figure 11 This is a schematic diagram of the automatic walkway scheme (when steps are missing) in this utility model;

[0024] Figure 12 This is a schematic diagram of the electrical principle of the ladder missing in Embodiment 1 of this utility model;

[0025] Figure 13 This is the pulse logic diagram for the ladder-level missing detection in this utility model (forward rotation);

[0026] Figure 14 This is the inverted step-by-step missing detection pulse logic diagram of this utility model;

[0027] Figure 15 This is a schematic diagram of the electrical principle of the ladder missing in Embodiment 2 of this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Missing step sensor one; 2. Missing step sensor two; A. Escalator missing detection switch; B. Step; C. Sidewalk missing detection switch; D. Beam; E. Shaft. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1:

[0032] See Figures 10-14As shown, it includes a step missing sensor 1 and a step missing sensor 2 installed behind the step of the escalator. The step missing sensor 1 and the step missing sensor 2 are installed in series, and the distance between the step missing sensor 1 and the step missing sensor 2 is less than the distance between the two shafts behind the same step.

[0033] Both the step-missing sensor 1 and the step-missing sensor 2 are NPN type proximity switches. The positive and negative terminals of the step-missing sensor 1 and the positive terminal of the step-missing sensor 2 are connected to the power supply port, respectively. The output terminal of the step-missing sensor 1 is connected to the negative terminal of the step-missing sensor 2, and the output terminal of the step-missing sensor 2 is connected to the input port of the safety monitoring board.

[0034] In this embodiment, step-missing sensor 1 and step-missing sensor 2 are connected in series. The output of step-missing sensor 1 is connected to the negative terminal of the power supply of step-missing sensor 2. Only when the output of step-missing sensor 1 is triggered and the output is low-level, are the positive and negative terminals of step-missing sensor 2 fully connected. That is, step-missing sensor 2 only starts working and sends a signal when step-missing sensor 1 has an output. The signal logic is high-level sleep and low-level trigger. The signal is parsed by the safety monitoring board to obtain the required pulse signal; such as Figure 13 As shown, in this case, JP4.1 (the input point of the safety monitoring board) has a pulse signal in stages 2-5, but no pulse signal in stages 1 and 6-9. Figure 14 As shown, there are pulse signals in stages 5-8, but no pulse signals in stages 1, 4, and 9.

[0035] like Figure 11 As shown, in the case of a missing step, since the two proximity switches cannot be turned on simultaneously, there is no pulse signal when passing over the missing step, and JP4.1 has no pulse signal input. Therefore, the safety monitoring board determines that the step is missing by monitoring the pulse frequency, and will stop the equipment to protect the safety of passengers and equipment.

[0036] Example 2:

[0037] See Figure 15 As shown, the difference from the above embodiment 1 is that both the ladder missing sensor 1 and the ladder missing sensor 2 are PNP type proximity switches. The positive and negative terminals of the ladder missing sensor 1 and the negative terminal of the ladder missing sensor 2 are respectively connected to the power supply port. The output terminal of the ladder missing sensor 1 is connected to the positive terminal of the ladder missing sensor 2, and the output terminal of the ladder missing sensor 2 is connected to the input port of the safety monitoring board.

[0038] In this embodiment, a PNP type proximity switch is used. Therefore, the ladder missing sensor 2 outputs a high level. The signal logic is low level sleep and high level trigger. The safety monitoring board can obtain the required pulse signal after parsing the pulse signal.

[0039] It should be understood that the above-described specific embodiments of this utility model are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within the protection scope of this utility model. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A moving walkway step absence detection device, characterized by: It contains the step missing sensor one (1) and step missing sensor two (2) installed behind the step of escalator, the step missing sensor one (1) and step missing sensor two (2) are installed in series, the distance between step missing sensor one (1) and step missing sensor two (2) is less than the distance between two shafts behind the same step.

2. A moving walk step absence detection device according to claim 1, characterized in that: The positive and negative poles of the step missing sensor one (1) and the positive pole of the step missing sensor two (2) are connected to the power supply port respectively, the output end of the step missing sensor one (1) is connected to the negative pole of the step missing sensor two (2), and the output end of the step missing sensor two (2) is connected to the input port of the safety monitoring board.

3. A moving walk step absence detection device according to claim 2, characterized in that: The step missing sensor one (1) and step missing sensor two (2) are both NPN type proximity switches.

4. The moving walkway step-loss detection device of claim 1, wherein: The positive and negative poles of the step missing sensor one (1) and the negative pole of the step missing sensor two (2) are connected to the power supply port respectively, the output end of the step missing sensor one (1) is connected to the positive pole of the step missing sensor two (2), and the output end of the step missing sensor two (2) is connected to the input port of the safety monitoring board.

5. A moving walk step absence detection device according to claim 4, characterized in that: The step missing sensor one (1) and step missing sensor two (2) are both PNP type proximity switches.

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