Method and System for Obtaining Equivalent No-Load Kinetic Energy of Escalator

Abstract

The present invention provides a method for obtaining the equivalent no-load kinetic energy of an escalator and a system for obtaining the equivalent no-load kinetic energy of an escalator. In the method for obtaining the equivalent no-load kinetic energy of an escalator, an unloaded braking test and at least one loaded braking test are performed on the escalator; the unloaded braking distance S0 of the unloaded braking test is obtained, the loaded braking distance S1 of the loaded braking test is obtained, and the corresponding load mass M1 is obtained; the equivalent no-load kinetic energy of the escalator is calculated through the equation #imgabs0#; wherein, α is the escalator angle, λ1 is the load influence coefficient, m1 is an arbitrary load mass, and v is the running speed of the escalator under an arbitrary load. The present invention can realize the electronic measurement of the braking distance of the escalator. Compared with the traditional manual measurement method, the electronic measurement not only has high measurement accuracy and small error, but also the test result (braking distance) can be directly obtained, which is convenient and fast to use.

Description

Technical Field

[0001] The present invention relates to the technical field of escalator testing, and more specifically, to a method for obtaining equivalent no-load kinetic energy of an escalator and a system for obtaining equivalent no-load kinetic energy of an escalator. Background Art

[0002] Escalators are indispensable means of transportation for transporting a large number of passengers in public places such as stations, shopping malls, and subways. In recent years, the number of escalators in China has increased rapidly, and their scope of use is extremely wide.

[0003] However, with the increase in the number of escalators, escalator safety accidents have occurred continuously. In particular, the braking performance of escalators and whether they can brake in time directly affect the severity of accidents. However, in the current industry, there are few and inconsistent evaluation methods for braking performance. In addition, there is a lack of specific standard specifications for escalator safety assessment, and escalator safety assessment is still in a state of being unfounded, which restricts the development of escalator safety assessment work.

[0004] Currently, in the field of research on the safe operation of escalators, the European Union is in a leading position in the world. The European Union introduced the idea of safety assessment into the manufacturing, installation, etc. of escalators earlier. For example, in EN115-1-2008 "Safety Rules for the Construction and Installation of Escalators and Moving Walks", the manufacturing, installation requirements and safety requirements for various aspects of elevators are fully integrated, which maximally reflects the idea of putting safety first. In China, the research on escalator safety technology is still in the stage of following the European Union and ISO standards. The basic safety standard for escalators, GB16899, equivalently adopts the European EN115-1 standard, providing a unified technical basis and safety requirements for the manufacturing, installation and inspection of escalators throughout the country, and is the most important part of the current technical regulations related to escalator safety in China. In terms of escalator safety assessment, GB24403.1 and GB20900 are respectively transformed from ISO / TS22559-1 "Safety Requirements for Elevators - Part 1 - Global Basic Safety Requirements" and ISO / TS14798 "Methods for Risk Assessment and Reduction of Elevators, Escalators and Moving Walks", and are two important reference standards in the field of escalator safety assessment in China.

[0005] In the national standards and inspection regulations for the detection of the stopping distance of escalators in China, there are requirements for the detection of the no-load and full-load stopping distances. However, in practice, the detection of the full-load stopping distance is very risky and requires high requirements. A certain number of weights are needed to complete it. During the operation process, there is a risk of damaging the steps and the building once carelessly. In addition, the capture of the braking action of the escalator is also carried out by means of manual observation, and the detection error of the braking distance is extremely large. Summary of the Invention

[0006] In summary, how to provide a new method for obtaining the equivalent no-load kinetic energy of an escalator has become an urgent problem to be solved by those skilled in the art.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a method for obtaining the equivalent no-load kinetic energy of an escalator. In this method for obtaining the equivalent no-load kinetic energy of an escalator:

[0009] Conduct a no-load braking test and at least one load-bearing braking test on the escalator;

[0010] Obtain the no-load braking distance S0 of the no-load braking test, obtain the load-bearing braking distance S1 of the load-bearing braking test and obtain the corresponding load mass M1;

[0011] Through the equation Calculate the equivalent no-load kinetic energy of the escalator;

[0012] Wherein, α is the escalator angle, λ1 is the load influence coefficient, m1 is an arbitrary load mass, and v is the running speed of the escalator under an arbitrary load.

[0013] Preferably, in the method for obtaining the equivalent no-load kinetic energy of the escalator provided by the present invention, the load influence coefficient λ1 = k0 / k1, wherein, K0 is the no-load test extrapolation coefficient, and K1 is the load-bearing extrapolation coefficient; the obtaining method of the extrapolation coefficient is: set a braking increment unit length D and obtain a discrete braking length according to the braking increment unit length D: 0 - D - 2D - 3D - 4D... nD, where n is a positive integer; for the no-load test extrapolation coefficient K0, if the no-load braking distance S0 falls within the interval of any two adjacent discrete values, then take the larger discrete value in this interval as the no-load extrapolation coefficient K0, if the no-load braking distance S0 falls on a discrete value point, then this discrete value point is the no-load extrapolation coefficient K0; for the load-bearing test extrapolation coefficient K1, if the load-bearing braking distance S1 falls within the interval of any two adjacent discrete values, then take the larger discrete value in this interval as the load-bearing extrapolation coefficient K1, if the load-bearing braking distance S1 falls on a discrete value point, then this discrete value point is the load-bearing extrapolation coefficient K1.

[0014] Preferably, in the method for obtaining the equivalent no-load kinetic energy of the escalator provided by the present invention, the braking increment unit length D is 0.1 cm.

[0015] Preferably, in the method for obtaining the equivalent no-load kinetic energy of the escalator provided by the present invention, the braking distance S is obtained by a distance sensor provided on the escalator.

[0016] Preferably, in the method for obtaining the equivalent no-load kinetic energy of an escalator provided by the present invention, the braking distance S is obtained as follows: a reference point is set relative to the escalator, and a distance sensor is set on the steps of the escalator; the frequency P of the distance sensor for obtaining the real-time distance is set, and a braking threshold M is set; the escalator is braked, and two adjacent distance values S n and S n-1 are obtained by the distance sensor, and ΔS is calculated, where ΔS = ||S n |-|S n-1 ||. When ΔS > the braking threshold M and the ΔS of continuously multiple adjacent points are all greater than the braking threshold M, the magnitude of S n-1 is recorded. When the escalator stops running, the magnitude of S at this time is recorded, and the braking distance magnitude is S - S n-1 .

[0017] Preferably, in the method for obtaining the equivalent no-load kinetic energy of an escalator provided by the present invention, the continuously multiple adjacent points are at least five consecutive adjacent points.

[0018] Preferably, in the method for obtaining the equivalent no-load kinetic energy of an escalator provided by the present invention, before braking the escalator, the escalator is in a uniform running state.

[0019] Preferably, in the method for obtaining the equivalent no-load kinetic energy of an escalator provided by the present invention, a tester with an operable equation is set on the steps of the escalator, and the distance sensor sends real-time distance information to the tester.

[0020] Preferably, in the method for obtaining the equivalent no-load kinetic energy of an escalator provided by the present invention, the test point has a vertical plane facing the escalator; the tester and the distance sensor are set on the same step of the escalator.

[0021] Preferably, in the method for obtaining the equivalent no-load kinetic energy of an escalator provided by the present invention, the distance sensor is a laser ranging sensor.

[0022] The present invention also provides an equivalent no-load kinetic energy obtaining system for an escalator. The equivalent no-load kinetic energy obtaining system for an escalator includes:

[0023] a distance sensor for obtaining the braking distance of the escalator;

[0024] a tester capable of calculating the equation as in claim 1 , the tester is in signal connection with the distance sensor and is used for receiving the real-time distance signal obtained by the distance sensor.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention can realize the electronic measurement of the braking distance of an escalator. Compared with the traditional manual measurement method, the electronic measurement not only has high measurement accuracy and small error, but also can directly obtain the test result (braking distance), which is convenient and fast to use.

[0027] 2. The present invention can easily obtain the equivalent no-load kinetic energy of the escalator by acquiring the no-load braking distance, the braking distance after loading a load, and the load weight of the escalator. The present invention only needs to measure the braking distance twice, and the number of measurements is greatly reduced. This not only improves the test efficiency, simplifies the test operation, and standardizes the test process, but also has no requirement for the load weight during the test of the braking distance with load. The test can be completed with a light load, and the operation is simple without causing damage to the device under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The attached drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0029] Figure 1 is a schematic structural diagram when the equivalent no-load kinetic energy acquisition system of the escalator in the embodiment of the present invention is set on the escalator step for testing;

[0030] Figure 2 is a block diagram of the internal circuit of the tester in the embodiment of the present invention.

[0031] In Figure 1 and Figure 2 the corresponding relationship between the component names and the reference numerals is as follows:

[0032] Escalator step 1, distance sensor 2, tester 3, reference point 4;

[0033] CPU 5, clock circuit module 51, reset circuit module 52, touch screen display module 53, WIFI communication module 54, power supply module 55, braking distance calculation module 56, laser ranging sensor interface 57, acceleration sensor interface 58. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention rather than a limitation thereof. In fact, those skilled in the art will appreciate that modifications and variations can be made to the present invention without departing from the scope or spirit thereof. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. Accordingly, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0035] In the description of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "connected" and "coupled" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through intermediate components. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] Please refer to Figure 1 and Figure 2 , where Figure 1 is a schematic structural diagram when the equivalent no-load kinetic energy acquisition system of the escalator in the embodiment of the present invention is set on the escalator steps for testing; Figure 2 is a block diagram of the internal circuit of the tester in the embodiment of the present invention.

[0037] The present invention provides a method for obtaining the equivalent no-load kinetic energy of an escalator. In this method, for obtaining the equivalent no-load kinetic energy of the escalator, the method flow of the present invention is as follows:

[0038] First step, accurately measure the braking distance of the escalator.

[0039] It should be noted that: all escalators operate obliquely, that is, obliquely upward or obliquely downward along a straight line. In the testing process of the present invention, the obtained braking distance is the projected distance of the testing point of the escalator (the point where the testing device is set on the escalator) on the horizontal plane.

[0040] The present invention uses an electronic testing device to obtain the braking distance of an escalator. The specific structure of the electronic testing device is as follows: it includes a vertically arranged reference point, a distance sensor 2 to be set on the escalator step 1, and a tester 3 (the tester 3 is wired to the distance sensor 2 and is simultaneously set on the escalator step 1). To improve the accuracy of obtaining the braking distance, the side of the reference point 4 facing the escalator is a vertical plane. The distance sensor 2 is set on the escalator step 1 and can obtain the distance from the reference point 4 (specifically referring to the vertical plane of the reference point facing the escalator) in real time. The tester 3 has a data processing function and a digital operation function, and determines whether the escalator starts to brake and automatically calculates the braking distance of the escalator based on the real-time distance information obtained by the distance sensor 2.

[0041] Specifically, the distance sensor used in the present invention is a laser ranging sensor, and a horizontal ranging laser is emitted from the laser ranging sensor to the test point. The laser ranging sensor has the characteristics of high measurement accuracy and sensitive response. Of course, the present invention can also adopt an ultrasonic ranging device, etc.

[0042] Regarding how to determine the start of braking of the escalator, the method adopted by the present invention is as follows:

[0043] First, set the frequency P at which the distance sensor obtains the real-time distance, and then set a braking threshold M according to the experience of those skilled in the art;

[0044] Then, place the distance sensor and the tester on the escalator step, and set the reference point at the same time. After powering on and starting the escalator to run, when the escalator runs at a constant speed, start the distance sensor and the tester to start measuring and calculating the distance change relative to the test point;

[0045] Finally, start the braking button of the escalator. The distance sensor obtains the real-time distance from the reference point at the frequency P and sends the real-time distance information to the tester. The tester processes and analyzes the real-time distance information. When the position change amount is greater than the braking threshold M, that is, ΔS = ||S n |-|S n-1 || > braking threshold M, and the ΔS of five consecutive adjacent points are all greater than the braking threshold M, record the magnitude of S n-1 When the escalator stops running, record the magnitude of S at this time, then the braking distance magnitude is S - S n-1 .

[0046] Through the above method, the electronic measurement of the braking distance of the escalator can be realized. Compared with the traditional manual measurement method, the electronic measurement not only has high measurement accuracy and small error, but also the test result (braking distance) can be directly obtained, which is convenient and fast to use.

[0047] Step 2: Test the no-load braking distance S0 when the escalator is unloaded, and calculate the braking distance S1 when the load mass is m1.

[0048] The method for calculating the braking distance S1 with load is as follows: S1 = k * m1 + S0, where k is the calculation coefficient.

[0049] The calculation coefficient k is set as follows: Set a braking increment unit length D, then the discrete braking lengths are: 0 - D - 2D - 3D - 4D...... nD, where n is a positive integer. Then, during the no-load braking test, the no-load braking distance S0 will surely fall within the interval between any two adjacent discrete values or on a discrete value point. If the no-load braking distance S0 falls within the interval between any two adjacent discrete values, then the larger discrete value in this interval is used as the calculation coefficient k. If the no-load braking distance S0 falls on a discrete value point, then this discrete value point is the calculation coefficient k.

[0050] For example, if the braking increment unit length D is 0.1, then the discrete braking lengths are: 0 - 0.1 - 0.2 - 0.3 - 0.4…… n * 0.1. When S0 <= 0.2, k = 0.2; when S0 <= 0.3, k = 0.3; when S0 <= 0.4, k = 0.4; when S0 <= 0.5, k = 0.5; when S0 <= 0.6, k = 0.6.

[0051] Then, when the escalator is unloaded, we have:

[0052] FS0 = k0E0;

[0053] When a load with a mass of m1 is installed, we have Equation 1:

[0054]

[0055] The no-load kinetic energy is Equation 2:

[0056]

[0057] By testing the no-load braking distance S0 and analyzing the load influence coefficient, the equivalent no-load kinetic energy of the escalator can be calculated, that is, the kinetic energy other than the load that needs to be dissipated by braking.

[0058] Compare Equation 1 with Equation 2, that is, divide the two equations, cancel out F, and use λ1 to replace k0 / k1 to obtain the equivalent no-load kinetic energy of the escalator, that is, Equation 3 is as follows:

[0059]

[0060] In the above formula: α is the inclination angle of the escalator; λ1 is the load influence coefficient, that is, k0 / k1; V is the running speed of the escalator.

[0061] The calculation formula of λ1 is as follows:

[0062]

[0063] It should be noted that: The load influence coefficient is obtained through repeated derivation based on experimental data. The derivation idea is to first derive a formula according to the law of conservation of energy, and then use the experimental data to reverse-derive the coefficient in the formula. For example, the same escalator can be tested differently, such as no-load braking test, braking test when the load is M1, braking test when the load is M2, braking test when the load is M3... In this way, through multiple sets of (braking distance, corresponding load) data obtained, λ1 = k0 / k1 can be calculated.

[0064] After obtaining Equation 3, the equivalent no-load kinetic energy of the escalator can be easily obtained by acquiring the no-load braking distance of the escalator, the braking distance after loading the load, and the load weight. The present invention only needs to measure the braking distance twice, and the number of measurements is greatly reduced. This not only improves the test efficiency, simplifies the test operation, and standardizes the test process, but also, when testing the braking distance with load, the present invention has no requirements for the load weight, and the test can be completed with a light load. Its operation is simple and will not cause damage to the device under test.

[0065] In the present invention, the structure of the tester used is: including a CPU5 and multiple functional modules connected to the CPU5. The multiple functional modules specifically include a clock circuit module 51, a reset circuit module 52, a touch screen display module 53, a WIFI communication module 54, a power supply module 55, and a braking distance calculation module 56. At the same time, multiple interfaces are also connected to the CPU. The multiple interfaces specifically include a laser ranging sensor interface 57 and an acceleration sensor interface 58.

[0066] The load influence coefficient involved in the present invention is obtained through repeated derivation based on experimental data. The idea is to first derive a formula according to the law of conservation of energy, and then use the experimental data to reverse-derive the coefficient in the formula.

[0067] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for obtaining the equivalent no-load kinetic energy of an escalator, characterized in that: Conduct no-load braking tests and at least one loaded braking test on the escalator; Obtain the no-load braking distance S0 of the no-load braking test, obtain the loaded braking distance S1 of the loaded braking test, and obtain the corresponding load mass M1; Calculate the equivalent no-load kinetic energy of the escalator through the equation ​ Wherein, α is the escalator angle, λ1 is the load influence coefficient, m1 is any load mass, and v is the running speed of the escalator under any load; The load influence coefficient λ1 = k0 / k1, where K0 is the no-load test extrapolation coefficient and K1 is the loaded extrapolation coefficient; The method for obtaining the extrapolation coefficient is as follows: Set the braking increment unit length D and obtain the discrete braking lengths according to the braking increment unit length D: 0 - D - 2D - 3D - 4D... nD, where n is a positive integer; For the no-load test extrapolation coefficient K0, if the no-load braking distance S0 falls within the interval of any two adjacent discrete values, then take the larger discrete value in this interval as the no-load extrapolation coefficient K0. If the no-load braking distance S0 falls on a discrete value point, then this discrete value point is the no-load extrapolation coefficient K0; For the loaded test extrapolation coefficient K1, if the loaded braking distance S1 falls within the interval of any two adjacent discrete values, then take the larger discrete value in this interval as the loaded extrapolation coefficient K1. If the loaded braking distance S1 falls on a discrete value point, then this discrete value point is the loaded extrapolation coefficient K1.

2. The method for obtaining the equivalent no-load kinetic energy of an escalator according to claim 1, characterized in that, The braking increment unit length D is 0.1 cm.

3. The method for obtaining the equivalent no-load kinetic energy of an escalator according to claim 1, characterized in that The braking distance S is obtained by a distance sensor provided on the escalator.

4. The method for obtaining the equivalent no-load kinetic energy of an escalator according to claim 3, characterized in that, The method for obtaining the braking distance S is as follows: Set a reference point relative to the escalator and set a distance sensor on the escalator step; Set the frequency P at which the distance sensor obtains the real-time distance and set the braking threshold M; Brake the escalator, and obtain two adjacent distance values S by the distance sensor n and S n-1 , and calculate ΔS, where ΔS = ||S n | - |S n-1 ||. When ΔS > braking threshold M and ΔS of multiple consecutive adjacent points are all greater than braking threshold M, record the magnitude of S n-1 . When the escalator stops running, record the magnitude of S at this time, then the braking distance magnitude is S - S n-1 .

5. The method for obtaining the equivalent no-load kinetic energy of an escalator according to claim 4, characterized in that, The continuous multiple adjacent points are at least five consecutive adjacent points.

6. The method for obtaining the equivalent no-load kinetic energy of an escalator according to claim 5, characterized in that, Before braking the escalator, the escalator is in a uniform running state.

7. The method for obtaining the equivalent no-load kinetic energy of an escalator according to claim 5, characterized in that An equation calculator is provided on the step of the escalator. The distance sensor sends real-time distance information to the calculator.

8. The method for obtaining the equivalent no-load kinetic energy of an escalator according to claim 7, characterized in that, The tester has a vertical plane facing the escalator; The tester and the distance sensor are arranged on the same escalator step.

9. The method for obtaining the equivalent no-load kinetic energy of an escalator according to any one of claims 5 to 8, characterized in that: The distance sensor is a laser ranging sensor.

10. An equivalent no-load kinetic energy acquisition system for an escalator, characterized in that, Comprising: A distance sensor for obtaining the braking distance of the escalator; A tester capable of calculating the equation in claim 1 The tester is signal-connected to the distance sensor and is configured to receive real-time distance signals acquired by the distance sensor.

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