Non-contact elevator slip amount detection device

Abstract

The utility model discloses a non -contact type elevator slip amount detection device relates to detection technical field, and the device includes non -contact type speedometer and rotation angle measuring device, and non -contact type speedometer is used for measuring the instantaneous speed of the traction rope of traction system, and rotation angle measuring device is used for setting in the outside of the traction wheel of traction system, and rotation angle measuring device is used for measuring the total rotation angle of traction wheel. The utility model is favorable for improving the accuracy of measurement and measurement accuracy, and is convenient for arrangement and installation.

Description

Technical Field

[0001] This utility model relates to the field of detection technology, and in particular to a non-contact elevator slip detection device. Background Technology

[0002] Elevator traction systems drive the car and counterweight by the friction between the traction sheave and the wire rope. Their safety depends on the effective engagement between the traction sheave and the wire rope. Traction sheave slippage refers to the relative displacement between the traction sheave and the wire rope during elevator operation due to insufficient friction. This slippage can be characterized by comparing the distance traveled by the traction sheave with the actual distance the wire rope tractions the car. Over time, friction and wear between the traction sheave and the wire rope can cause abnormal slippage. If the slippage exceeds a safety threshold, it will lead to a decrease in traction capacity, reduced traction power, and decreased elevator leveling accuracy, potentially causing serious accidents such as car overshooting or bottoming out. Furthermore, abnormal slippage significantly accelerates system failure.

[0003] Traditional methods for detecting elevator slippage rely on manual marking and visual inspection to determine the slippage amount. This method depends on the subjective experience of the inspectors for qualitative assessment, which is not only inefficient and cumbersome, but also results in large dispersion of measurement results due to subjective errors, making it difficult to meet the high-precision detection requirements for safe elevator operation. Existing contact-type slippage measurement technology mainly uses direct mechanical coupling between the encoder and the wire rope. The encoder is installed invasively inside the traction sheave to obtain displacement data of the wire rope and the traction sheave. The displacement data of the wire rope is then compared and calculated with the displacement data of the traction sheave to obtain the slippage amount. Although this solution can achieve real-time monitoring, it has significant drawbacks: long-term mechanical contact between the encoder and the wire rope not only leads to accelerated sensor wear and decreased signal stability, but also causes system measurement errors due to uneven contact stress distribution or friction interference; the invasive installation method of the encoder requires structural modification of the traction sheave, resulting in poor compatibility and complex deployment. The methods described above cannot provide a more precise quantitative assessment of sheave slippage. Due to the lack of accurate criteria for determining failure, users often find themselves in a dilemma of "over-replacing" or "delaying replacement," resulting in both high maintenance costs and safety hazards. Therefore, there is an urgent need for a high-precision slippage detection device and method to provide a quantitative scientific basis for traction sheave failure assessment, thereby balancing safety requirements and economic costs. Utility Model Content

[0004] The purpose of this invention is to provide a non-contact elevator slip detection device to solve the problems existing in the prior art. It will not cause wear or affect the non-contact speed measuring instrument, which is conducive to improving the accuracy and precision of the measurement, and is easy to arrange and install.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a non-contact elevator slip detection device, including a non-contact speed measuring instrument and a rotation angle measuring device. The non-contact speed measuring instrument is used to measure the instantaneous speed of the traction rope of the traction system; the rotation angle measuring device is used to be installed outside the traction sheave of the traction system and is used to measure the total rotation angle of the traction sheave.

[0007] Preferably, the non-contact speed measuring instrument is a Doppler speed measuring instrument.

[0008] Preferably, the rotation angle measuring device includes a first bracket, a grating disk, a light source, a photosensitive element, and a processor. The grating disk is detachably fixed to the end face of the traction sheave. The light source, the photosensitive element, and the processor are all mounted on the first bracket. The grating disk has multiple light-transmitting holes arranged along its circumference. The light source and the photosensitive element are located on opposite sides of the grating disk. The light beam emitted by the light source can pass through a portion of the light-transmitting holes and be received by the photosensitive element. The photosensitive element is communicatively connected to the processor. The processor is used to obtain the total rotation angle of the traction sheave.

[0009] Preferably, the rotation angle measuring device further includes a collimator disposed between the light source and the grating disk, the collimator being capable of converting the light beam emitted by the light source into a parallel light beam.

[0010] Preferably, the rotation angle measuring device further includes a double-hole baffle, which is disposed between the grating disk and the photosensitive sensor. The double-hole baffle has two through holes. The photosensitive element includes two photosensitive sensors, each of which is disposed on the first bracket. The two through holes are respectively disposed opposite to the two photosensitive sensors, and each through hole can be aligned with a light-transmitting hole on the grating disk. The parallel light beam can pass through a light-transmitting hole and the corresponding through hole in sequence and be received by the corresponding photosensitive sensor. Each photosensitive sensor is communicatively connected to the processor.

[0011] Preferably, the rotation angle measuring device further includes a housing; the light source and the collimator are fixedly connected to one end of the housing, and the double-hole baffle, the photosensitive element and the processor are fixedly connected to the other end of the housing.

[0012] Preferably, the first support includes a support body and a connecting support; the support body is capable of relative movement with respect to the traction sheave perpendicular to the axial direction of the traction sheave; the connecting support is movably connected to the support body and is capable of relative movement with respect to the support body in the height direction; the housing is movably connected to the connecting support and is capable of relative movement with respect to the connecting support in the direction parallel to the axial direction of the traction sheave.

[0013] Preferably, the grating disk can be magnetically connected to one end face of the traction sheave.

[0014] Preferably, it also includes a gimbal, on which the non-contact speed measuring instrument is mounted; the gimbal is capable of adjusting the pitch angle and height of the non-contact speed measuring instrument.

[0015] Preferably, it further includes a second bracket, the gimbal being connected to the second bracket, the second bracket being disposed on one side of the traction wheel in the radial direction, and the second bracket being capable of relative movement with respect to the traction wheel perpendicular to the axial direction of the traction wheel.

[0016] The present invention achieves the following technical advantages over the prior art:

[0017] This invention provides a non-contact elevator slip measurement device, comprising a non-contact tachometer and a rotation angle measuring device. The non-contact tachometer measures the instantaneous speed of the traction rope in the traction system; the rotation angle measuring device is installed outside the traction sheave of the traction system and measures the total rotation angle of the traction sheave. This embodiment employs dual-channel measurement technology to measure slip. Specifically, the non-contact tachometer measures the instantaneous speed of the traction rope, obtaining its displacement within the sampling time interval; the rotation angle measuring device measures the total rotation angle of the traction sheave, obtaining its displacement. The absolute value of the difference between these two displacements is the sheave slip. Because a non-contact tachometer is used, it does not cause wear or affect the tachometer during traction system operation, thus improving measurement accuracy and precision. The rotation angle measuring device is externally mounted on the outside of the traction sheave, facilitating placement and installation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the overall structure of the non-contact elevator slip detection device provided in Example 1;

[0020] Figure 2 A schematic diagram of the non-contact speed measuring instrument and the second support provided in Example 1;

[0021] Figure 3 Schematic diagram of the internal structure of the shell provided in Embodiment 1 Figure 1 ;

[0022] Figure 4 A front view of the internal structure of the housing provided in Embodiment 1;

[0023] Figure 5 Schematic diagram of the internal structure of the shell provided in Embodiment 1 Figure 2 ;

[0024] Figure 6 This is a schematic diagram of the structure of the grating disk provided in Example 1;

[0025] Figure 7 A schematic diagram of the structure of the first support provided in Embodiment 1;

[0026] Figure 8 A flowchart of the rope pulley slip detection method provided in Example 2;

[0027] In the diagram: 100. Non-contact elevator slip detection device; 1. Non-contact speedometer; 2. Rotation angle measuring device; 201. First bracket; 202. Grating disk; 203. Light source; 204. Photosensitive element; 205. Light-transmitting hole; 206. Collimator; 207. Double-hole baffle; 208. Through hole; 209. Housing; 210. Bracket body; 211. Connecting bracket; 212. Schmitt trigger; 213. Signal preprocessing circuit board; 214. Pulse counter; 215. Signal processing module; 3. Traction rope; 4. Traction wheel; 5. Second bracket; 6. Pan-tilt unit; 7. Support structure; 8. Motor; 9. Guide wheel; 10. Magnet. Detailed Implementation

[0028] 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.

[0029] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "center," "longitudinal," "transverse," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "clockwise," and "counterclockwise," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] The purpose of this invention is to provide a non-contact elevator slip detection device to solve the problems existing in the prior art. It will not cause wear or affect the non-contact speed measuring instrument, which is conducive to improving the accuracy and precision of the measurement, and is easy to arrange and install.

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] like Figures 1-6As shown, this embodiment provides a non-contact elevator slip detection device 100, including a non-contact tachometer 1 and a rotation angle measuring device 2. The non-contact tachometer 1 is used to measure the instantaneous speed of the traction rope 3 of the traction system; the rotation angle measuring device 2 is installed outside the traction sheave 4 of the traction system and is used to measure the total rotation angle of the traction sheave 4. This embodiment uses dual-channel measurement technology to measure slip. Specifically, the non-contact tachometer 1 is used to measure the instantaneous speed of the traction rope 3, and the displacement of the traction rope 3 within the sampling time interval can be obtained through the instantaneous speed of the traction rope 3; the displacement of the traction sheave 4 is obtained by measuring the total rotation angle of the traction sheave 4 through the rotation angle measuring device 2. The absolute value of the difference between the two displacements is the sheave slip. Since the non-contact tachometer 1 is used for measurement, it will not cause wear or affect the non-contact tachometer 1 during the operation of the traction system, which is beneficial to improving the accuracy and precision of the measurement. The rotation angle measuring device 2 is externally mounted on the outside of the traction sheave 4, which facilitates its arrangement and installation.

[0035] In some specific embodiments, the non-contact speed measuring instrument 1 is a Doppler speed measuring instrument. Preferably, the non-contact speed measuring instrument 1 is an enhanced laser Doppler speed measuring instrument. When the elevator is running, the laser Doppler speed measuring instrument emits a high-power laser. Through the high-power laser and the adaptive filtering algorithm built into the laser Doppler speed measuring instrument, the interference of oil stains and vibration on the surface of the traction rope 3 is effectively overcome, and the reflected light signal is captured in real time to calculate the linear velocity of the traction rope 3. Preferably, the speed data throughout the entire process is recorded by a high-speed data acquisition module, and the time integration is performed to finally output the running distance of the traction rope 3 during the operation of the traction system within the sampling time interval, which can achieve millimeter-level displacement detection. There is no need to clean, spray, or mark the traction rope 3 for pretreatment.

[0036] In some specific embodiments, the rotation angle measuring device 2 includes a first support 201, a grating disk 202, a light source 203, a photosensitive element 204, and a processor. The grating disk 202 is detachably fixed to the end face of the traction wheel 4 and can rotate synchronously with the traction wheel 4 around its axis. The light source 203, the photosensitive element 204, and the processor are all mounted on the first support 201. The grating disk 202 has multiple light-transmitting holes 205 arranged along the circumference of the grating. The light source 203 and the photosensitive element 204 are arranged on both sides of the grating disk 202. The light beam emitted by the light source 203 can pass through some of the light-transmitting holes 205 and be received by the photosensitive element 204. The photosensitive element 204 is communicatively connected to the processor. The processor is used to obtain the total rotation angle of the traction wheel 4.

[0037] In some specific embodiments, the rotation angle measuring device 2 further includes a collimator 206, which is disposed between the light source 203 and the grating disk 202. The collimator 206 can convert the light beam emitted by the light source 203 into a parallel light beam.

[0038] In some specific embodiments, the rotation angle measuring device 2 further includes a double-hole baffle 207, which is disposed between the grating disk 202 and the photosensitive sensor. The double-hole baffle 207 has two through holes 208. The photosensitive element 204 includes two photosensitive sensors, each of which is disposed on the first bracket 201. The two through holes 208 are respectively disposed opposite to the two photosensitive sensors, and each through hole 208 can be opposite to a light-transmitting hole 205 on the grating disk 202. Parallel light beams can pass through each light-transmitting hole 205 and the corresponding through hole 208 in sequence and be received by the corresponding photosensitive sensor. Each photosensitive sensor is communicatively connected to the processor. Slippage refers to the difference between the distance traveled by the traction rope 3 (such as a wire rope) and the distance traveled by the traction sheave in one stroke. When measuring the slippage of an elevator in one up-and-down stroke, the traction sheave rotates clockwise when the elevator car is going up and counterclockwise when the car is going down. The distance traveled by the traction sheave 4, Lsheave, is a vector value, and its sign is determined by the direction of rotation. Its value is greater than zero when rotating clockwise and less than zero when rotating counterclockwise. If the direction is misjudged (for example, misjudging counterclockwise as clockwise), the slippage will be incorrectly accumulated as a positive value, resulting in a calculated slippage value much larger than the true value. Therefore, it is necessary to determine the rotation direction of the traction sheave 4. When the grating disk 202 rotates, the light-transmitting aperture 205 passes sequentially through the detection areas of two photosensitive sensors (phase A sensor and phase B sensor). Since the two photosensitive sensors are spaced 1 / 4 of the aperture distance apart, after a certain light-transmitting aperture 205 fully triggers the phase A sensor, the grating disk 202 needs to continue rotating by 1 / 4 of the aperture distance before that aperture 205 fully triggers the phase B sensor. Simply put, when the light beam transmitted through a certain light-transmitting aperture 205 of the grating disk 202 is triggered by the phase A sensor, this aperture 205 will pass through the double-aperture baffle 207 at a distance of 1 / 4 of the aperture distance before being triggered by the phase B sensor, thus creating a 90° phase difference. For example, when the traction wheel 4 rotates forward, the phase A pulse signal leads the phase B pulse signal by 90° (phase A triggers first); when the traction wheel 4 rotates in reverse, the phase B pulse signal leads the phase A pulse signal by 90° (phase B triggers first). By detecting the phase relationship between the two pulse signals, the rotation direction can be determined in real time. Therefore, the two photosensitive sensors are constantly receiving light beam signals. The rotation direction of the traction wheel 4 is identified by a phase difference generated when the grating disk 202 rotates through the same hole, due to the obstruction of the double-hole baffle 207 and the grating disk 202. By adjusting the distance between the collimator 206, the double-hole baffle 207, and the grating disk 202, the light beam can pass parallel to the light-transmitting hole 205 and the baffle, ensuring that the light spot falls evenly and clearly onto the photosensitive sensors.

[0039] In some specific embodiments, the rotation angle measuring device 2 further includes a housing 209; the first support 201 includes a support body 210 and a connecting support 211; the support body 210 is capable of relative movement with respect to the traction wheel 4 perpendicular to the axial direction of the traction wheel 4; the connecting support 211 is movably connected to the support body 210, and the connecting support 211 is capable of relative movement with respect to the support body 210 in the height direction; the housing 209 is movably connected to the connecting support 211, and the housing 209 is capable of relative movement with respect to the connecting support 211 in the direction parallel to the axial direction of the traction wheel 4; the light source 203 and the collimator 206 are fixedly connected to one end of the housing 209, and the double-hole baffle 207, the photosensitive element 204, and the processor are fixedly connected to the other end of the housing 209. Through the above arrangement, the height and horizontal position of the rotation angle measuring device 2 can be adjusted, thereby aligning the center of the light source 203, the center of the photosensitive sensor, and the center of the light-transmitting hole 205, and placing the light source 203 and the photosensitive sensor at corresponding positions on both sides of the grating disk 202; as Figure 4 As shown, after power is applied, the position of the light source 203 is finely adjusted back and forth to change the distance between the light source 203 and the collimator 206, thereby changing the beam size and ensuring that the light spot completely covers the light-transmitting holes 205 of the two photosensitive sensors.

[0040] In some specific embodiments, the grating disk 202 can be magnetically connected to one end face of the traction sheave 4, allowing for quick replacement to fit different sizes of traction sheaves 4. The installation of the grating disk 202 can be achieved without drilling, cutting or other mechanical modifications to the traction sheave 4.

[0041] In some specific embodiments, a second support 5 and a gimbal 6 are also included. The gimbal 6 is connected to the second support 5, preferably in a fixed connection. The non-contact speed measuring instrument 1 is mounted on the gimbal 6. The second support 5 is positioned on one side of the traction sheave 4 in the radial direction and can move relative to the traction sheave 4 perpendicular to its axial direction. The gimbal 6 can adjust the pitch angle and height of the non-contact speed measuring instrument 1. The distance between the second support 5 and the traction rope 3 can be adjusted according to testing requirements, and / or the pitch angle and / or height of the non-contact speed measuring instrument 1 can be adjusted, thereby adjusting the emission angle of the laser emitted by the non-contact speed measuring instrument 1. This allows the laser emitted by the non-contact speed measuring instrument 1 to be uniformly and obliquely projected onto the surface of the traction rope 3, adapting to installation scenarios of traction sheaves 4 with different diameters. This ensures that the laser accurately covers the effective measurement area of ​​the wire rope, without requiring contact with the wire rope or modification of the traction sheave 4 structure, and can meet the testing requirements of different models of traction sheaves 4.

[0042] In some specific embodiments, two photosensitive sensors are arranged along the circumference of the grating disk 202 at intervals of 1 / 4 of the aperture spacing. A parallel light beam passing through the same aperture 205 can sequentially trigger the two photosensitive sensors. When the grating disk 202 rotates, the aperture 205 periodically triggers the two photosensitive sensors to generate pulse signals with a phase difference of 90°. Specifically, assuming that the grating disk 202 has N apertures 205, the aperture spacing P = 2πR / N, and the 1 / 4 aperture spacing = P / 4.

[0043] In some specific embodiments, the processor includes a Schmitt trigger 212, a signal preprocessing circuit board 213, and a pulse counter 214. The signal preprocessing circuit board 213 and the Schmitt trigger 212 are integrated into a single unit, forming a signal processing module 215. The Schmitt trigger 212, the signal preprocessing circuit board 213, and the pulse counter 214 are all fixedly connected to the end of the housing 209 furthest from the light source 203 and from the photosensor. The raw electrical signal received by the photosensor is transmitted to the signal preprocessing circuit board 213 for initial processing. The processed analog signal is then converted into a digital square wave pulse signal by the Schmitt trigger 212. After shaping by the Schmitt trigger 212, the signal is input to the pulse counter 214. The pulse counter 214 acquires the cumulative pulse count and determines the rotation direction. After operation, the cumulative pulse count n and the rotation direction are read from the pulse counter 214 module. The pulse counter 214 is connected to the signal processing module 215. The signal processing module 215 obtains the running distance of the traction wheel 4 in one stroke based on the cumulative number of pulses, the radius of the traction wheel 4, and the number of light-transmitting holes 205.

[0044] In some specific embodiments, the grating disk 202 is annular and needs to be customized according to the diameter of the traction wheel 4. The inner ring of the grating disk 202 is provided with multiple magnets 10 arranged circumferentially around the grating disk 202. The magnets 10 can be attracted to the end face of the traction wheel 4 to attach the grating disk 202 to the outer edge of the traction wheel 4. The number and selection of magnets 10 ensure that the grating disk 202 does not shift after being attracted. The outer ring of the grating disk 202 has multiple light-transmitting holes 205 equidistantly spaced, and the number of light-transmitting holes 205 is configured according to the accuracy requirements.

[0045] In some specific embodiments, the rotation angle measuring device 2 is disposed on the top of the traction sheave 4, the length direction of the housing 209 is parallel to the axis of the traction sheave 4, the housing 209 is disposed directly above the traction sheave 4, and the middle part hangs above the grating disk 202. U-shaped housings 209 are mounted on both ends of the top of the traction sheave 4. The support body 210 is disposed behind the traction sheave 4.

[0046] In some specific embodiments, the collimator 206 is a cylindrical lens, and the light beam emitted by the light source 203 passes through the cylindrical lens perpendicularly to the cylindrical surface to form a parallel light band, which then illuminates the photosensitive sensor.

[0047] In some specific embodiments, the positions of the first bracket 201 and the second bracket 5 can be adjusted by manual movement, or wheels can be provided at the bottom of the base of the first bracket 201 and the second bracket 5 to adjust their positions by pushing.

[0048] In some specific embodiments, the end of the support body 210 is provided with a first elongated hole extending along the height direction, and one end of the connecting support 211 is provided with a first connector, which passes through the first elongated hole and is threadedly connected to a nut; the other end of the connecting support 211 is provided with a second elongated hole extending along the axial direction of the traction wheel 4, and the upper end of the housing 209 is provided with a second connector, which passes through the second elongated hole and is threadedly connected to a nut. When height and horizontal displacement adjustment are required, the corresponding nuts are loosened to move the first connector in the first elongated hole to the desired position, and the second connector in the second elongated hole to the desired position. Then, the corresponding nuts are tightened to lock the first and second connectors.

[0049] In a preferred embodiment, the light source 203 is an LED light source.

[0050] As a preferred implementation, the total sampling time is the time required for the elevator to complete one full journey.

[0051] In a preferred embodiment, the non-contact elevator slip detection device 100 is placed in the elevator machine room to measure the slip between the elevator traction sheave 4 and the traction rope 3. The traction rope 3 is a steel wire rope, and the traction sheave 4 is fixed on the support structure 7. The traction sheave 4 is driven to rotate by a motor 8. The traction system also includes a guide wheel 9, with the steel wire rope wound around the traction sheave 4 and the guide wheel 9. It should be noted that this embodiment is not limited to elevators, but can also be applied to crane drums and pulley blocks in industrial lifting equipment, mine hoist drums in mine hoisting systems, quay cranes and gantry crane pulleys in port hoisting equipment, drive wheels and guide wheels in cable car and ropeway systems, tower crane winches and construction hoist traction sheaves in construction machinery, anchor winches and mooring winches in shipbuilding and marine engineering, and other scenarios.

[0052] This embodiment systematically overcomes the limitations of traditional detection methods through non-contact measurement, modular adaptation, and data fusion technology. Its high detection accuracy, zero-wear long lifespan, rapid deployment capability, and adaptability to all working conditions provide a reliable technical tool for elevator safety supervision. This embodiment effectively balances safety requirements and economic benefits, promoting the upgrade of the elevator maintenance industry towards intelligence and standardization.

[0053] Example 2

[0054] This embodiment provides an elevator slip detection method based on the non-contact elevator slip detection device 100 in Embodiment 1, including the following steps:

[0055] The traction system is started. The instantaneous velocity of the traction rope 3 within the sampling time interval is monitored by the non-contact velocimeter 1, and the total rotation angle of the traction sheave 4 within the sampling time interval is monitored by the rotation angle measuring device 2. The rope line displacement of a point on the traction rope 3 within the sampling time interval is obtained by measuring the instantaneous velocity of the traction rope 3 within the sampling time interval. The wheel line displacement of a point on the inner bottom wall of the rope groove of the traction sheave 4 within the sampling time interval is obtained by measuring the total rotation angle of the traction sheave 4 within the sampling time interval. The difference between the rope line displacement and the wheel line displacement is obtained, and the absolute value of the difference between the rope line displacement and the wheel line displacement is the rope sheave slippage.

[0056] In some specific embodiments, the rotation angle measuring device 2 includes a first support 201, a grating disk 202, a light source 203, a photosensitive element 204, and a processor. The grating disk 202 is used to detachably fix it to the end face of the traction wheel 4. The light source 203, the photosensitive element 204, and the processor are all mounted on the first support 201. The grating disk 202 has a plurality of light-transmitting holes 205 arranged along the circumference of the grating. The light source 203 and the photosensitive element 204 are arranged on both sides of the grating disk 202. The light beam emitted by the light source 203 can pass through part of the light-transmitting holes 205 and be received by the photosensitive element 204. The photosensitive element 204 is communicatively connected to the processor. The processor is used to obtain the total rotation angle of the traction wheel 4.

[0057] The rope displacement is obtained using Formula 1; the wheel displacement is obtained using Formulas 2 and 3; Formula 1 is:

[0058]

[0059] Among them, L rope For the displacement of the rope, t i Let v(t) be the time of the i-th sampling point. i ) represents the instantaneous velocity of the traction rope 3 at the i-th sampling point, Δt represents the sampling time interval, and n represents the total number of sampling points;

[0060] Formulas two and three are:

[0061]

[0062] Among them, L sheave θ is the displacement of the rope line, θ is the total rotation angle of the traction wheel 4, n is the cumulative number of pulses obtained by the processor based on the pulse signal generated by the photosensitive element 204, N is the number of light-transmitting holes 205 in a single turn of the grating disk 202, and R is the radius of the traction wheel 4.

[0063] In some specific implementations, the method for obtaining Formula 1 includes: integrating the absolute value of the instantaneous velocity over time to calculate the running distance L of the wire rope within the sampling time interval [t1, t2]. rope Formula 4 is obtained; Formula 1 is obtained by calculating the discrete velocity data using numerical integration methods (such as the trapezoidal method).

[0064]

[0065] Where v(t) is the instantaneous velocity of the traction rope 3, t1 is the start time of the sampling time interval, and t2 is the end time of the sampling time interval.

[0066] In some specific embodiments, the process also includes device debugging before testing: adjusting the non-contact speed measuring instrument 1 to be at the same height as the center of the wire rope, moving the non-contact speed measuring instrument 1 so that its laser probe is directly facing the wire rope and the laser beam is directly facing the middle of the wire rope. The pan-tilt unit 6 is rotated downwards or downwards to adjust the pitch angle of the non-contact speed measuring instrument 1. Different laser incident angles are adjusted according to different situations, so that the high-power laser emitted by the non-contact speed measuring instrument 1 is projected onto the surface of the wire rope in an oblique incident manner, and the laser beam is focused into a spot covering the middle of the wire rope. At this point, the device debugging is complete. Adjust the height and horizontal position of the rotation angle measuring device 2 to align the center of the light source 203, the center of the photosensitive sensor, and the center of the light-transmitting hole 205, so that the light source 203 and the photosensitive sensor are placed in corresponding positions on both sides of the grating disk 202. After powering on, finely adjust the position of the light source 203 back and forth to change the distance between the light source 203 and the collimator 206 to change the beam size, ensuring that the light spot completely covers the light-transmitting holes 205 of the two photosensitive sensors. At this time, the rotation angle measuring device 2 is debugged.

[0067] In some specific embodiments, the method further includes: after the device is debugged, the elevator is started to run. The grating disk 202 rotates synchronously with the traction sheave 4. The divergent light emitted by the light source 203 is focused by the cylindrical lens and converted into a parallel light band. The parallel light band passes perpendicularly through the light-transmitting hole 205 of the grating disk 202. Stray light is blocked by the double-hole block, that is, light passing through the light-transmitting hole 205 of the grating disk 202 is allowed to pass through the through hole 208. Ambient light in other directions is completely blocked to suppress ambient light interference and prevent ambient light from destroying the phase relationship of the two photosensitive sensors. The two photosensitive sensors are A / B phase dual photosensitive sensors. The A / B phase dual photosensitive sensors are set at a distance of 1 / 4 of the light-transmitting hole 205 along the rotation direction of the grating disk 202, generating pulses with a phase difference of 90°. The raw electrical signal received by the photosensitive sensor is transmitted to the signal preprocessing circuit board 213 for primary processing. The processed analog signal is then converted into a digital square wave pulse signal by the Schmitt trigger 212. After being shaped by the Schmitt trigger 212, it is input to the pulse counter 214. The pulse counter 214 obtains the cumulative pulse count and determines the rotation direction. After the operation is completed, the cumulative pulse count n and the rotation direction are read from the pulse counter 214 module.

[0068] In some specific implementations, the linear velocity of the wire rope is measured in real time based on the laser Doppler frequency shift principle, and millimeter-level displacement detection is achieved through high-speed sampling. Simultaneously, an external photoelectric encoding device (rotation angle measuring device 2) is used to obtain the running distance of the traction sheave 4 by counting grating pulses and converting the rotation angle. The two systems operate independently, and the slippage is finally calculated through difference. The overall accuracy is significantly better than traditional image marking methods and contact sensor measurement methods. It can effectively identify minute slippage anomalies and is suitable for complex working conditions such as oil stains and vibration.

[0069] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A non-contact elevator slip detection device, characterized in that: It includes a non-contact speed measuring instrument and a rotation angle measuring device. The non-contact speed measuring instrument is used to measure the instantaneous speed of the traction rope of the traction system. The rotation angle measuring device is installed outside the traction sheave of the traction system and is used to measure the total rotation angle of the traction sheave.

2. The non-contact elevator slip detection device according to claim 1, characterized in that: The non-contact speed measuring instrument is a Doppler speed measuring instrument.

3. The non-contact elevator slip detection device according to claim 1, characterized in that: The rotation angle measuring device includes a first bracket, a grating disk, a light source, a photosensitive element, and a processor. The grating disk is detachably fixed to the end face of the traction sheave. The light source, the photosensitive element, and the processor are all mounted on the first bracket. The grating disk has multiple light-transmitting holes along its circumference. The light source and the photosensitive element are located on opposite sides of the grating disk. The light beam emitted by the light source can pass through some of the light-transmitting holes and be received by the photosensitive element. The photosensitive element is communicatively connected to the processor. The processor is used to obtain the total rotation angle of the traction sheave.

4. The non-contact elevator slip detection device according to claim 3, characterized in that: The rotation angle measuring device also includes a collimator, which is disposed between the light source and the grating disk. The collimator is capable of converting the light beam emitted by the light source into a parallel light beam.

5. The non-contact elevator slip detection device according to claim 4, characterized in that: The rotation angle measuring device further includes a double-hole baffle, which is disposed between the grating disk and the photosensitive element. The double-hole baffle has two through holes. The photosensitive element includes two photosensitive sensors, each of which is disposed on the first bracket. The two through holes are respectively disposed opposite to the two photosensitive sensors, and each through hole can be aligned with a light-transmitting hole on the grating disk. The parallel light beam can pass through a light-transmitting hole and the corresponding through hole in sequence and be received by the corresponding photosensitive sensor. Each photosensitive sensor is communicatively connected to the processor.

6. The non-contact elevator slip detection device according to claim 5, characterized in that: The rotation angle measuring device also includes a housing; the light source and the collimator are fixedly connected to one end of the housing, and the double-hole baffle, the photosensitive element and the processor are fixedly connected to the other end of the housing.

7. The non-contact elevator slip detection device according to claim 6, characterized in that: The first support includes a support body and a connecting support; the support body is capable of relative movement with respect to the traction sheave perpendicular to the axial direction of the traction sheave; the connecting support is movably connected to the support body and is capable of relative movement with respect to the support body in the height direction; the housing is movably connected to the connecting support and is capable of relative movement with respect to the connecting support in the direction parallel to the axial direction of the traction sheave.

8. The non-contact elevator slip detection device according to claim 3, characterized in that: The grating disk can be magnetically attached to one end face of the traction sheave.

9. The non-contact elevator slip detection device according to claim 1, characterized in that: It also includes a gimbal, on which the non-contact speed measuring instrument is mounted; the gimbal is capable of adjusting the pitch angle and height of the non-contact speed measuring instrument.

10. The non-contact elevator slip detection device according to claim 9, characterized in that: It also includes a second bracket, the gimbal being connected to the second bracket, the second bracket being disposed on one side of the radial direction of the traction wheel, and the second bracket being capable of relative movement with respect to the traction wheel perpendicular to the axial direction of the traction wheel.

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