An elevator leveling detection system based on laser ranging

Abstract

The application discloses an elevator leveling detection system based on laser ranging, comprising: a laser ranging module fixedly installed in an elevator shaft pit; a car bottom reflector fixedly installed at the bottom of an elevator car and opposite to the light path of the laser ranging module; an elevator main control unit connected with the laser ranging module; wherein the laser ranging module is used for measuring real-time distance data between the laser ranging module and the car bottom reflector and sending the real-time distance data to the elevator main control unit; the elevator main control unit receives the real-time distance data and compares the real-time distance data with pre-stored standard leveling distance data of each floor, judges the elevator leveling state according to the comparison result and outputs a control instruction. The application adopts non-contact laser ranging, which ensures the stability and reliability of the leveling detection signal, improves the anti-pollution ability, greatly reduces the complexity of installation and debugging and the labor cost, improves the debugging efficiency, and improves the safety of the elevator.

Description

Technical Field

[0001] This invention relates to the field of elevator leveling detection technology, and specifically to an elevator leveling detection system based on laser ranging. Background Technology

[0002] Elevator leveling detection is a crucial step in ensuring safe elevator operation and passenger comfort. It directly affects the accuracy of elevator landing at floors and the safety of door opening and closing. Currently, the mainstream leveling detection methods in the elevator industry are mainly divided into two categories: magnetic sensors combined with magnetic shielding plates and optical leveling switches combined with light-shielding plates.

[0003] The detection method using magnetic sensors in conjunction with magnetic shielding plates involves installing a magnetic switch on the car side and fixing metal magnetic shielding plates on each floor of the hoistway, relying on changes in the magnetic field to trigger a leveling signal. However, this structure is susceptible to electromagnetic interference from the elevator traction system and surrounding electrical equipment, leading to signal instability. Over long-term use, magnetic attenuation of the magnetic components, corrosion of metal parts, vibration, and other issues can all cause excessive leveling deviations, severely impacting the elevator's operational accuracy and safety.

[0004] Optical leveling switches, when used with light-shielding plates, employ an infrared emitter-receiver through-beam structure, triggering signals by blocking the light path. However, elevator shafts often contain contaminants such as dust, oil, and moisture, which easily adhere to the surface of the photoelectric lens, causing light path obstruction and leading to false triggering or signal failure. More importantly, optical leveling switches can only determine "whether there is obstruction" and cannot quantify the specific distance of leveling offset, making fine-tuning difficult and hindering the achievement of high-precision leveling control.

[0005] The aforementioned traditional leveling detection structures all rely on qualitative switching signals, failing to provide precise real-time values ​​of the elevator's offset from the standard leveling position. This makes the installation and commissioning process highly dependent on repeated manual calibration, time-consuming and labor-intensive, resulting in high maintenance costs. Furthermore, in harsh environments such as high-speed elevators, heavy-duty freight elevators, and damp shafts, traditional leveling devices exhibit high failure rates, severely impacting the elevator's operational stability and reliability. Therefore, there is an urgent need for an elevator leveling detection device that provides high precision, interference resistance, quantifiable detection, and convenient maintenance to address these issues. Existing technologies require significant improvement to address these problems. Summary of the Invention

[0006] This invention discloses an elevator leveling detection system based on laser ranging, which aims to solve the technical problems of existing elevator leveling detection devices, such as susceptibility to electromagnetic interference, unstable signals, susceptibility to contaminants, inability to quantify leveling offset distance, high installation, debugging and maintenance costs, and high failure rate in harsh environments.

[0007] The technical solution of the present invention is as follows: An elevator leveling detection system based on laser ranging includes: The laser ranging module is fixedly installed at the bottom of the elevator shaft pit; A car bottom reflector is fixedly installed at the bottom of the elevator car and is directly opposite the optical path of the laser ranging module. The elevator main control unit is connected to the laser ranging module. The laser ranging module is used to measure the real-time distance between itself and the car floor reflector, and send the data to the elevator main control unit. The elevator main control unit is used to receive the real-time distance data, compare it with the pre-stored standard leveling distance data for each floor, determine the elevator leveling status based on the comparison result, and output control commands.

[0008] Furthermore, it also includes: The signal processing unit is electrically connected to both the laser ranging module and the elevator main control unit. It is used to amplify, filter, and perform analog-to-digital conversion on the distance data collected by the laser ranging module, and transmit the processed real-time distance data to the elevator main control unit.

[0009] Furthermore, the signal processing unit has a built-in EMC electromagnetic filter circuit, which is used to suppress electromagnetic interference generated by the elevator traction machine and the frequency converter.

[0010] Furthermore, it also includes: A status display module, connected to the signal processing unit, is used to display the real-time distance data and the status of the planar terrain. The fault alarm module is connected to the signal processing unit and is used to output an alarm signal when the laser signal is lost or the ranging error is out of tolerance.

[0011] Furthermore, the laser ranging module includes a laser emitting module, a laser receiving module, and a mounting base, with the laser emitting module and the laser receiving module integrated into a single structure.

[0012] Furthermore, the mounting base includes a shock-absorbing rubber pad and a metal fixing seat, with the shock-absorbing rubber pad positioned between the metal fixing seat and the ground of the elevator shaft pit.

[0013] Furthermore, the car bottom reflector includes a reflector plate and a fixed bracket, and the reflector plate is fixedly installed at the bottom of the elevator car by the fixed bracket.

[0014] Furthermore, the surface of the reflector is coated with an anti-fouling and wear-resistant coating.

[0015] Furthermore, the thickness of the anti-fouling and wear-resistant coating is 2mm to 5mm.

[0016] Furthermore, the laser ranging module is a pulsed laser ranging sensor.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention discloses an elevator leveling detection system based on laser ranging. Its core lies in using a laser ranging module to measure the distance between the elevator car and the pit in real time, and transmitting the data to the elevator main control unit for comparison and judgment. Compared to the magnetic sensor combined with a magnetic shielding plate and an optical leveling switch mentioned in the background technology, this technical solution has significantly superior performance.

[0018] First, to address the problem of unstable signals caused by electromagnetic interference in magnetic sensors, this invention employs laser ranging technology. Its working principle is based on optical signal transmission, which has natural isolation from electromagnetic interference sources. This effectively avoids electromagnetic interference from the elevator traction system and surrounding electrical equipment, ensuring the stability and reliability of the leveling detection signal.

[0019] Secondly, addressing the issue that photoelectric level switches are susceptible to signal mis-triggers or failures due to contaminants such as dust, oil, and water vapor within the shaft, this invention features an open optical path between the laser ranging module and the car bottom reflector. Furthermore, the laser has strong penetrating power, meaning that even with a small amount of contaminants, the impact on the laser signal is far less than the obstruction effect on traditional photoelectric switches. In addition, a non-fouling and wear-resistant coating is applied to the reflector surface, further enhancing its anti-fouling capabilities.

[0020] Furthermore, traditional leveling detection devices rely on qualitative switching signals, failing to quantify the specific distance of leveling deviation. This leads to significant challenges in fine-tuning and a heavy reliance on repeated manual calibration during installation and debugging. The laser ranging module of this invention provides real-time, precise distance data, enabling quantitative detection of leveling deviation. By comparing the real-time distance data with pre-stored standard leveling distance data, the elevator main control unit can accurately determine the elevator's leveling status and output corresponding control commands. This achieves high-precision leveling control, significantly reducing the complexity and labor costs of installation and debugging, and improving debugging efficiency.

[0021] Finally, because this invention uses non-contact laser ranging, it avoids the problems of wear, corrosion, vibration and displacement of traditional mechanical contact or magnetic components, thus improving the long-term stability and reliability of the device. Especially in harsh environments such as high-speed elevators, heavy-duty freight elevators and damp shafts, its failure rate will be significantly reduced, thereby effectively solving the problem of high failure rate of traditional leveling devices in the prior art and improving the operational stability and safety of elevators. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the installation of the present invention; Figure 2 This is a schematic diagram of signal transmission according to the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] To illustrate the technical solution described in this invention, specific embodiments are described below.

[0026] Example This embodiment provides an elevator leveling detection system based on laser ranging. See [link to documentation]. Figure 1 , Figure 2 The system mainly comprises a laser ranging module 1, a car bottom reflector 2, and an elevator main control unit 3. The laser ranging module 1 is fixedly installed in the elevator shaft pit, while the car bottom reflector 2 is fixedly installed at the bottom of the elevator car, directly opposite the optical path of the laser ranging module 1. The elevator main control unit 3 is electrically connected to the laser ranging module 1.

[0027] Specifically, the laser ranging module 1 is a sensor used to measure distance. Its working principle involves emitting a laser beam, receiving the laser light reflected back from an object, and calculating the distance based on the laser's time of flight or phase difference. In this embodiment, the laser ranging module 1 is used to measure the real-time distance data between itself and the car floor reflector. This real-time distance data is then sent to the elevator main control unit 3. As a preferred embodiment, the laser ranging module 1 can employ a pulsed laser ranging sensor, which features high accuracy and fast response, meeting the real-time requirements of elevator leveling detection.

[0028] The car bottom reflector 2 is a reflective surface installed at the bottom of the elevator car. Its function is to reflect the laser beam emitted by the laser ranging module back to the laser ranging module. The surface of the car bottom reflector 2 is usually made of a highly reflective diffuse reflective material to ensure that the laser signal can be effectively reflected, thereby improving the accuracy and stability of the ranging.

[0029] The elevator main control unit 3 is the core control component of the entire system. Its function is to receive real-time distance data from the laser ranging module. The elevator main control unit 3 stores pre-stored standard leveling distance data for each floor. Upon receiving the real-time distance data, the elevator main control unit 3 compares it with the pre-stored standard leveling distance data. Based on the comparison result, the elevator main control unit 3 can determine the current leveling status of the elevator and output corresponding control commands, such as deceleration, stopping, or door opening commands.

[0030] During normal elevator operation, the laser ranging module 1 continuously emits a laser beam. After being reflected by the car bottom reflector 2, the laser beam is received by the laser ranging module 1, which measures the real-time distance between itself and the reflector 2. This real-time distance data is sent to the elevator main control unit 3. Upon receiving the real-time distance data, the elevator main control unit 3 compares it with pre-stored standard leveling distance data for that floor. If the real-time distance data is within a preset offset threshold range, the elevator is determined to be in a precise leveling state, and the elevator main control unit outputs stop and door opening commands. If the real-time distance data exceeds the offset threshold range, the elevator is determined to have deviated from the leveling position, and the elevator main control unit 3 outputs deceleration and fine-tuning control commands based on the offset to ensure the elevator car accurately stops at the leveling position. Therefore, this system achieves quantitative, high-precision, all-weather detection of the elevator's leveling position, effectively reducing environmental interference, simplifying installation and commissioning processes, and significantly improving the stability and safety of elevator operation.

[0031] Furthermore, a signal processing unit 4 is included. This unit is electrically connected to both the laser ranging module 1 and the elevator main control unit 3. The signal processing unit 4 amplifies, filters, and performs analog-to-digital conversion on the distance data collected by the laser ranging module 1, and then transmits the processed real-time distance data to the elevator main control unit 3. The introduction of the signal processing unit 4 ensures that the distance data collected by the laser ranging module 1 undergoes professional amplification, filtering, and analog-to-digital conversion before being transmitted to the elevator main control unit 3, greatly improving the signal-to-noise ratio and accuracy of the data.

[0032] Preferably, the signal processing unit 4 has a built-in EMC electromagnetic filter circuit to suppress electromagnetic interference generated by the elevator traction machine and the frequency converter. The EMC electromagnetic filter circuit is a circuit specifically designed to suppress electromagnetic interference; its main function is to filter out electromagnetic noise of various frequencies carried in power lines or signal lines, ensuring the normal operation of the circuit.

[0033] Furthermore, it also includes a status display module 5 and a fault alarm module 6. The status display module 5 is connected to the signal processing unit 4 and is used to display real-time distance data and leveling status. The fault alarm module 6 is connected to the signal processing unit 4 and is used to output an alarm signal when the laser signal is lost or the ranging error exceeds the limit. The status display module 5 can intuitively display the elevator's real-time operating data and current leveling status to operators or maintenance personnel; the fault alarm module 6 can promptly alert relevant personnel to potential faults and handle them, ensuring the safe operation of the elevator.

[0034] Specifically, the laser ranging module 1 includes a laser emitting module, a laser receiving module, and a mounting base. The laser emitting module and the laser receiving module are integrated into a single structure, which helps to simplify the installation process and improve the compactness of the system.

[0035] Furthermore, the mounting base includes a shock-absorbing rubber pad and a metal fixing seat, with the shock-absorbing rubber pad positioned between the metal fixing seat and the floor of the elevator shaft pit. By introducing the shock-absorbing rubber pad into the mounting base, an effective shock-absorbing layer is formed between the laser ranging module and the floor of the elevator shaft pit.

[0036] Specifically, the car bottom reflector 2 includes a reflector plate and a fixed bracket. The reflector plate is fixedly installed at the bottom of the elevator car via the fixed bracket. The fixed bracket provides a solid and reliable support structure for the reflector plate, which can effectively resist the vibration and impact generated during elevator operation, thereby ensuring that the position and angle of the reflector plate remain stable at all times.

[0037] Preferably, the surface of the reflector is coated with a 2mm to 5mm anti-fouling and wear-resistant coating. This gives the reflector surface anti-fouling and wear-resistant properties, enabling the laser ranging module 1 to continuously receive stable and clear reflected signals, thereby ensuring the accuracy of real-time distance data.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An elevator leveling detection system based on laser ranging, characterized in that, include: The laser ranging module is fixedly installed at the bottom of the elevator shaft pit; A car bottom reflector is fixedly installed at the bottom of the elevator car and is directly opposite the optical path of the laser ranging module. The elevator main control unit is connected to the laser ranging module. The laser ranging module is used to measure the real-time distance between itself and the car floor reflector, and send the data to the elevator main control unit. The elevator main control unit is used to receive the real-time distance data, compare it with the pre-stored standard leveling distance data for each floor, determine the elevator leveling status based on the comparison result, and output control commands.

2. The elevator leveling detection system based on laser ranging according to claim 1, characterized in that, Also includes: The signal processing unit is electrically connected to both the laser ranging module and the elevator main control unit. It is used to amplify, filter, and perform analog-to-digital conversion on the distance data collected by the laser ranging module, and transmit the processed real-time distance data to the elevator main control unit.

3. The elevator leveling detection system based on laser ranging according to claim 2, characterized in that, The signal processing unit has a built-in EMC electromagnetic filter circuit, which is used to suppress electromagnetic interference generated by the elevator traction machine and frequency converter.

4. The elevator leveling detection system based on laser ranging according to claim 2, characterized in that, Also includes: A status display module, connected to the signal processing unit, is used to display the real-time distance data and the status of the planar terrain. The fault alarm module is connected to the signal processing unit and is used to output an alarm signal when the laser signal is lost or the ranging error is out of tolerance.

5. The elevator leveling detection system based on laser ranging according to claim 1, characterized in that, The laser ranging module includes a laser emitting module, a laser receiving module, and a mounting base, with the laser emitting module and the laser receiving module integrated into a single structure.

6. The elevator leveling detection system based on laser ranging according to claim 5, characterized in that, The mounting base includes a shock-absorbing rubber pad and a metal fixing seat, with the shock-absorbing rubber pad positioned between the metal fixing seat and the ground of the elevator shaft pit.

7. The elevator leveling detection system based on laser ranging according to claim 1, characterized in that, The car bottom reflector includes a reflector plate and a fixed bracket, and the reflector plate is fixedly installed at the bottom of the elevator car by the fixed bracket.

8. The elevator leveling detection system based on laser ranging according to claim 7, characterized in that, The surface of the reflector is coated with a dirt-resistant and wear-resistant coating.

9. The elevator leveling detection system based on laser ranging according to claim 8, characterized in that, The thickness of the anti-fouling and wear-resistant coating is 2mm to 5mm.

10. The elevator leveling detection system based on laser ranging according to claim 1, characterized in that, The laser ranging module is a pulsed laser ranging sensor.

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