Non-contact elevator slip amount detection device and method

Abstract

The invention discloses a non-contact type elevator slip amount detection device and method, and relates to the technical field of detection, the device comprises a non-contact type speed measuring instrument and a rotation angle measuring device, the non-contact type speed measuring instrument is used for measuring the instantaneous speed of a traction rope of a traction system; the rotation angle measuring device is used for being arranged outside a traction wheel of the traction system and used for measuring the total rotation angle of the traction wheel. The method comprises the steps that the displacement of a hoisting rope in a sampling time interval can be obtained through the instantaneous speed of the hoisting rope; the displacement of the traction sheave is obtained through the total rotation angle of the traction sheave measured by the rotation angle measuring device, and the absolute value of the difference value of the two displacements is the slippage amount of the rope sheave. The measuring accuracy and the measuring precision can be improved, and arrangement and installation are convenient.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and in particular to a non-contact elevator slippage detection device and method. Background Art

[0002] Elevator traction systems use friction between the traction sheave and wire rope to drive the car and counterweight up and down. Their safety relies on the effective engagement between the traction sheave and wire rope. Traction sheave slip refers to the relative displacement between the traction sheave and wire rope caused by insufficient friction between the two during the operation of an elevator or other equipment. This slip can be characterized by comparing the distance the traction sheave travels during elevator operation with the distance the wire rope actually travels to pull the car. Over long-term use, friction and wear between the traction sheave and wire rope can cause abnormal slippage. If this slippage exceeds a safe threshold, it can lead to a decrease in traction capacity, reduced traction capacity, and decreased elevator leveling accuracy, potentially causing serious accidents such as the car hitting the top or bottom of the car. Furthermore, abnormal slippage can significantly accelerate system failure.

[0003] Traditional elevator slip detection methods rely on manual marking combined with visual inspection to determine slip. This method relies on qualitative assessment based on the subjective experience of the inspector, resulting in low efficiency and cumbersome operation. Subjective errors also lead to high dispersion in measurement results, making it difficult to meet the high-precision testing requirements for safe elevator operation. Existing contact-based sheave slip measurement technology primarily utilizes an encoder directly mechanically coupled to the wire rope. The encoder is invasively installed within the traction sheave to obtain displacement data of the wire rope and sheave. The wire rope displacement data is then compared and calculated with the traction sheave displacement data to determine the slip. While this solution enables real-time monitoring, it has significant drawbacks: prolonged mechanical contact between the encoder and the wire rope not only increases sensor wear and degrades signal stability, but can also cause measurement errors due to uneven contact stress distribution or friction interference. Furthermore, the invasive installation of the encoder requires structural modifications to the traction sheave, resulting in poor compatibility and complex deployment. The above method cannot provide a more accurate quantitative determination of sheave slip. Due to the lack of accurate basis for invalidation, users often fall into the dilemma of "over-replacement" or "delayed replacement", resulting in high maintenance costs and safety hazards. Therefore, a high-precision slip detection device and method is urgently needed to provide a quantitative scientific basis for traction sheave failure determination, thereby balancing safety requirements and economic costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a non-contact elevator slip detection device and method to solve the problems existing in the above-mentioned prior art, without causing wear or impact on the non-contact tachometer, which is conducive to improving the accuracy and precision of measurement and is easy to arrange and install.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a non-contact elevator slippage detection device, comprising a non-contact speedometer and a rotation angle measuring device, wherein the non-contact speedometer is used to measure the instantaneous speed of the traction rope of the traction system; the rotation angle measuring device is used to be arranged outside the traction sheave of the traction system, and the rotation angle measuring device is used to measure the total rotation angle of the traction sheave.

[0007] Preferably, the non-contact velocimeter is a Doppler velocimeter.

[0008] Preferably, the rotation angle measuring device includes a first bracket, a grating disk, a light source, a photosensitive element and a processor, wherein the grating disk is used to be detachably fixedly connected to the end face of the traction wheel; the light source, the photosensitive element and the processor are all mounted on the first bracket; the grating disk is provided with a plurality of light-transmitting holes along the circumference of the grating, the light source and the photosensitive element are arranged on both sides of the grating disk, and 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 wheel.

[0009] Preferably, the rotation angle measuring device further comprises a collimator, which is arranged between the light source and the grating disk, and can convert the light beam emitted by the light source into a parallel light beam.

[0010] Preferably, the rotation angle measuring device also includes a double-hole baffle, which is arranged between the grating disk and the photosensor, and has two through holes; the photosensitive element includes two photosensors, and each of the photosensors is arranged on the first bracket; the two through holes are respectively arranged opposite to the two photosensors, and each of the through holes can be opposite to one of the light-transmitting holes on the grating disk; the parallel light beam can pass through one of the light-transmitting holes and the corresponding through hole in turn and be received by the corresponding photosensor; each of the photosensors is communicatively connected to the processor.

[0011] Preferably, the rotation angle measuring device also includes a shell; the first bracket includes a bracket body and a connecting bracket; the bracket body can produce relative movement perpendicular to the axial direction of the traction wheel relative to the traction wheel; the connecting bracket is movably connected to the bracket body, and the connecting bracket can produce relative movement in the height direction with the bracket body; the shell is movably connected to the connecting bracket, and the shell can produce relative movement with the connecting bracket parallel to the axis direction of the traction wheel; the light source and the collimator are fixedly connected to one end of the shell, and the double-hole baffle, the photosensor and the processor are fixedly connected to the other end of the shell.

[0012] Preferably, the grating disk can be magnetically connected to one end face of the traction wheel.

[0013] Preferably, it also includes a second bracket and a pan-tilt head, the pan-tilt head is connected to the second bracket, and the non-contact speed meter is mounted on the pan-tilt head; the second bracket is used to be arranged on one side of the radial direction of the traction wheel, and the second bracket can produce relative movement perpendicular to the axial direction of the traction wheel relative to the traction wheel; the pan-tilt head can adjust the pitch angle and height of the non-contact speed meter.

[0014] The present invention also provides an elevator slippage detection method based on the non-contact elevator slippage detection device, comprising the following steps:

[0015] Start the traction system, monitor the instantaneous speed of the traction rope within the sampling time interval by the non-contact speed meter, and monitor the total rotation angle of the traction wheel within the sampling time interval by the rotation angle measuring device; obtain the rope line displacement of a point on the traction rope within the sampling time interval by the instantaneous speed of the traction rope within the sampling time interval; obtain the wheel line displacement of a point on the inner bottom wall of the rope groove of the traction wheel within the sampling time interval by the total rotation angle of the traction wheel within the sampling time interval; obtain the difference between the rope line displacement and the wheel line displacement, and the absolute value of the difference between the rope line displacement and the wheel line displacement is the rope slip amount.

[0016] Preferably, the rotation angle measuring device includes a first bracket, a grating disk, a light source, a photosensitive element, and a processor, wherein the grating disk is used to be detachably fixedly connected to the end surface of the traction sheave; the light source, the photosensitive element, and the processor are all mounted on the first bracket; the grating disk is provided with a plurality of light-transmitting holes along the circumference of the grating; the light source and the photosensitive element are arranged on both 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; and the processor is used to obtain the total rotation angle of the traction sheave;

[0017] The rope displacement is obtained by formula 1; the wheel displacement is obtained by formulas 2 and 3; formula 1 is:

[0018]

[0019] Among them, L rope is the cable displacement, t i is the time of the i-th sampling point, v(t i ) is the instantaneous speed of the traction rope at the i-th sampling point, Δt is the sampling time interval, and n is the total number of sampling points;

[0020] Formula 2 and Formula 3 are:

[0021]

[0022]

[0023] Among them, L sheave is the rope displacement, θ is the total rotation angle of the traction wheel, n is the cumulative number of pulses obtained by the processor based on the pulse signal generated by the photosensitive element, N is the number of light-transmitting holes in a single circle of the grating disk, and R is the radius of the traction wheel.

[0024] Compared with the prior art, the present invention has achieved the following technical effects:

[0025] The present invention provides a non-contact elevator slip detection device and method, comprising a non-contact tachometer and a rotation angle measuring device. The non-contact tachometer is used to measure the instantaneous velocity 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 to measure the total rotation angle of the traction sheave. This embodiment uses a dual-channel measurement technique to measure slip. Specifically, the non-contact tachometer is used to measure the instantaneous velocity of the traction rope, and the displacement of the traction rope within the sampling time interval can be obtained from the instantaneous velocity of the traction rope. The displacement of the traction sheave is obtained by measuring the total rotation angle of the traction sheave by the rotation angle measuring device. The absolute value of the difference between the two displacements is the sheave slip. Because the non-contact tachometer is used for measurement, the non-contact tachometer will not be worn or affected during the operation of the traction system, which is beneficial for improving the accuracy and precision of the measurement. The rotation angle measuring device is external and installed on the outside of the traction sheave, making it easy to arrange and install. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of the non-contact elevator slippage detection device provided in Example 1;

[0028] Figure 2 A schematic structural diagram of the non-contact speed meter and the second bracket provided in Example 1;

[0029] Figure 3 Schematic diagram of the internal structure of the housing provided in Example 1 Figure 1 ;

[0030] Figure 4 A front view of the internal structure of the housing provided in Example 1;

[0031] Figure 5 Schematic diagram of the internal structure of the housing provided in Example 1 Figure 2 ;

[0032] Figure 6 A schematic diagram of the structure of the grating disk provided in Example 1;

[0033] Figure 7 A schematic diagram of the structure of the first bracket provided in Example 1;

[0034] Figure 8 Flowchart of the sheave slippage detection method provided in Example 2;

[0035] In the figure: 100, non-contact elevator slip detection device; 1, non-contact tachometer; 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, shell; 210, bracket body; 211, connecting bracket; 212, Schmitt trigger; 213, signal pre-processing circuit board; 214, pulse counter; 215, signal processing module; 3, traction rope; 4, traction sheave; 5, second bracket; 6, pan / tilt; 7, supporting structure; 8, motor; 9, guide wheel; 10, magnet. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] It should be noted that in the description of the present invention, terms such as "upper", "lower", "left", "right", "inside", "outside", "front", "back", "center", "longitudinal", "lateral", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "clockwise", and "counterclockwise" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0038] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] The purpose of the present invention is to provide a non-contact elevator slip detection device and method to solve the problems existing in the above-mentioned prior art, without causing wear or impact on the non-contact tachometer, which is conducive to improving the accuracy and precision of measurement and is easy to arrange and install.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] like Figures 1 to 6As shown, this embodiment provides a non-contact elevator slip detection device 100, comprising a non-contact tachometer 1 and a rotation angle measuring device 2. The non-contact tachometer 1 is used to measure the instantaneous velocity of the traction rope 3 of the traction system; the rotation angle measuring device 2 is disposed 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 employs a dual-channel measurement technique to measure slip. Specifically, the non-contact tachometer 1 measures the instantaneous velocity of the traction rope 3, and the displacement of the traction rope 3 within the sampling time interval can be obtained from the instantaneous velocity of the traction rope 3. The displacement of the traction sheave 4 is obtained from the total rotation angle of the traction sheave 4 measured by the rotation angle measuring device 2. The absolute value of the difference between the two displacements is the sheave slip. Because the non-contact tachometer 1 is used for measurement, the non-contact tachometer 1 is not worn or affected during the operation of the traction system, which helps improve the accuracy and precision of the measurement. The rotation angle measuring device 2 is externally mounted on the outside of the traction sheave 4 for ease of arrangement and installation.

[0043] In some specific embodiments, the non-contact velocimeter 1 is a Doppler velocimeter. Preferably, the non-contact velocimeter 1 is an enhanced laser Doppler velocimeter. When the elevator is running, the laser Doppler velocimeter emits a high-power laser. The high-power laser and the laser Doppler velocimeter's built-in adaptive filtering algorithm effectively overcome interference from oil and vibration on the surface of the traction rope 3, capture the reflected light signal in real time, and calculate the linear velocity of the traction rope 3. Preferably, a high-speed data acquisition module records the entire speed data, performs a time integration operation, and ultimately outputs the travel distance of the traction rope 3 during the operation of the traction system within the sampling time interval, enabling millimeter-level displacement detection. No cleaning, spraying, or marking pretreatment of the traction rope 3 is required.

[0044] In some specific embodiments, the rotation angle measuring device 2 includes a first bracket 201, a grating disk 202, a light source 203, a photosensitive element 204 and a processor. The grating disk 202 is used to be detachably fixedly connected to the end face of the traction wheel 4, and the grating disk 202 can rotate synchronously with the traction wheel 4 around the axis of the traction wheel 4; the light source 203, the photosensitive element 204 and the processor are all installed on the first bracket 201; the grating disk 202 is provided with a plurality of light-transmitting holes 205 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, and 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; and the processor is used to obtain the total rotation angle of the traction wheel 4.

[0045] In some specific embodiments, the rotation angle measuring device 2 further includes a collimator 206 . The collimator 206 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.

[0046] In some specific embodiments, the rotation angle measuring device 2 also includes a double-hole baffle 207, which is arranged between the grating disk 202 and the photosensor, and has two through holes 208; the photosensitive element 204 includes two photosensors, each of which is arranged on the first bracket 201; the two through holes 208 are respectively arranged opposite to the two photosensors, and each through hole 208 can be opposite to a light-transmitting hole 205 on the grating disk 202; the parallel light beam can pass through each light-transmitting hole 205 and the corresponding through hole 208 in sequence and be received by the corresponding photosensor; each photosensor is communicatively connected to the processor. Slip refers to the difference between the distance traveled by the traction rope 3 (e.g., a wire rope) and the distance traveled by the traction sheave during a single trip. When measuring the slip during an elevator's up / down travel, the traction sheave rotates forward when the elevator car is ascending and reverses when the car is descending. The distance Lsheave traveled by the traction sheave 4 is a vector value, and its sign is determined by the direction of rotation. Its value is greater than zero during forward rotation and less than zero during reverse rotation. If the direction is misjudged (for example, reverse rotation is mistakenly identified as forward rotation), the slip will be incorrectly accumulated as a positive value, causing the calculated slip value to be much greater than the actual value. Therefore, it is necessary to determine the direction of rotation of the traction sheave 4. As the grating disk 202 rotates, the light holes 205 sequentially pass through the detection areas of two photosensors (the A-phase sensor and the B-phase sensor). Because the two photosensors are separated by 1 / 4 of the aperture pitch, after a particular light hole 205 fully triggers the A-phase sensor, the grating disk 202 must continue rotating by 1 / 4 of the aperture pitch before that light hole 205 fully triggers the B-phase sensor. Simply put, when the light beam passing through a light hole 205 on the grating disk 202 is triggered by the A-phase sensor, this light hole 205 passes through the 1 / 4 of the aperture pitch separating the double-aperture baffle 207 and is then triggered by the B-phase sensor, resulting in a 90° phase difference. For example, when the traction wheel 4 rotates forward, the A-phase pulse signal leads the B-phase pulse signal by 90° (Phase A triggers first). When the traction wheel 4 rotates backward, the B-phase pulse signal leads the A-phase pulse signal by 90° (Phase B triggers first). By detecting the phase relationship between the two pulse signals, the direction of rotation can be determined in real time. Therefore, the two photosensors are constantly receiving light beam signals. However, due to the obstruction of the dual-hole baffle 207, a certain phase difference is generated when the same hole of the grating disk 202 rotates through the two sensors, thereby identifying the rotation direction of the traction sheave 4. By adjusting the distance between the collimator 206, the dual-hole baffle 207, and the grating disk 202, the light beam can pass through the light-transmitting hole 205 and the baffle in parallel, so that the light spot falls evenly and clearly on the photosensors.

[0047] In some specific embodiments, the rotation angle measuring device 2 also includes a housing 209; the first bracket 201 includes a bracket body 210 and a connecting bracket 211; the bracket body 210 can produce relative movement perpendicular to the axial direction of the traction wheel 4 relative to the traction wheel 4; the connecting bracket 211 is movably connected to the bracket body 210, and the connecting bracket 211 can produce relative movement in the height direction with the bracket body 210; the housing 209 is movably connected to the connecting bracket 211, and the housing 209 can produce relative movement with the connecting bracket 211 parallel to the axis 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, so that the center of the light source 203, the photosensor and the center of the light-transmitting hole 205 are aligned, and the light source 203 and the photosensor are placed at corresponding positions on both sides of the grating disk 202; Figure 4 As shown, after power is turned on, the position of the light source 203 is fine-tuned forward and backward, and the distance between the light source 203 and the collimator 206 is changed to change the size of the light beam to ensure that the light spot completely covers the light holes 205 of the two photosensors.

[0048] In some specific embodiments, the grating disk 202 can be magnetically connected to one end face of the traction sheave 4, and can be quickly replaced to adapt to traction sheaves 4 of different sizes. The grating disk 202 can be installed without drilling, cutting or other mechanical modifications to the traction sheave 4.

[0049] In some specific embodiments, the apparatus further includes a second bracket 5 and a pan / tilt platform 6. The pan / tilt platform 6 is connected to the second bracket 5, preferably fixedly connected, and the non-contact speed meter 1 is mounted on the pan / tilt platform 6. The second bracket 5 is positioned radially to one side of the traction sheave 4 and is capable of relative movement perpendicular to the axial direction of the traction sheave 4. The pan / tilt platform 6 is capable of adjusting the pitch angle and height of the non-contact speed meter 1. The distance between the second bracket 5 and the traction rope 3 and / or the pitch angle and / or height of the non-contact speed meter 1 can be adjusted according to test requirements, thereby adjusting the emission angle of the laser beam emitted by the non-contact speed meter 1. This ensures that the laser beam emitted by the non-contact speed meter 1 is uniformly and obliquely projected onto the surface of the traction rope 3, adapting to installation scenarios with traction sheaves 4 of varying diameters. This ensures that the laser beam 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. This allows for testing of different traction sheave models.

[0050] In some embodiments, two photosensors are arranged along the circumference of the grating disk 202, spaced 1 / 4 the aperture pitch. A parallel light beam passing through the same aperture 205 can sequentially trigger the two photosensors. As the grating disk 202 rotates, the aperture 205 periodically triggers the two photosensors to generate pulse signals with a 90° phase difference. Specifically, assume that the grating disk 202 has N apertures 205, the aperture pitch P = 2πR / N, and the 1 / 4 aperture pitch = P / 4.

[0051] 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 signal processing module 215. The Schmitt trigger 212, the signal preprocessing circuit board 213, and the pulse counter 214 are all fixedly connected to an end of the housing 209 away from the light source 203 and the photosensor. The raw electrical signal received by the photosensor 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 into the pulse counter 214. The pulse counter 214 obtains the accumulated pulse count and determines the rotation direction. After the operation is completed, the accumulated pulse count n and the rotation direction are read from the pulse counter 214 module. The pulse counter 214 is signal-connected to the signal processing module 215 . The signal processing module 215 obtains the running distance of the traction wheel 4 in one stroke according to the accumulated pulse number, the radius of the traction wheel 4 , and the number of the light-transmitting holes 205 .

[0052] In some specific embodiments, the grating disk 202 is annular and needs to be customized according to the diameter of the traction sheave 4. The inner ring of the grating disk 202 is equipped with multiple magnets 10 arranged along its circumference. The magnets 10 can be attracted to the end surface of the traction sheave 4 to attach the grating disk 202 to the outer edge of the traction sheave 4. The number and type of magnets 10 ensure that the grating disk 202 does not deviate after attraction. The outer ring of the grating disk 202 is evenly spaced with multiple light-transmitting holes 205. The number of light-transmitting holes 205 is configured according to the required precision.

[0053] In some embodiments, the rotation angle measurement device 2 is mounted on top of the traction sheave 4. The length of the housing 209 is parallel to the axial direction of the traction sheave 4. The housing 209 is positioned directly above the traction sheave 4, with its center portion suspended above the grating disk 202. U-shaped housings 209 are mounted at both ends of the top of the traction sheave 4. The bracket body 210 is positioned behind the traction sheave 4.

[0054] In some specific embodiments, the collimator 206 is a cylindrical lens. The light beam emitted by the light source 203 passes through the cylindrical lens perpendicular to the cylindrical surface to form a parallel light band, and then illuminates the photosensor.

[0055] In some specific embodiments, the positions of the first bracket 201 and the second bracket 5 can be adjusted by manually moving them, or walking wheels are provided at the bottom of the bases of the first bracket 201 and the second bracket 5 to adjust their positions by pushing them.

[0056] In some embodiments, the end of the bracket body 210 is provided with a first elongated hole extending in the height direction. A first connector is provided at one end of the connecting bracket 211, which passes through the first elongated hole and is threadedly connected to a nut. The other end of the connecting bracket 211 is provided with a second elongated hole extending axially along the traction sheave 4. A second connector is provided at the upper end of the housing 209, which passes through the second elongated hole and is threadedly connected to the nut. To adjust the height and horizontal displacement, the corresponding nuts are loosened to move the first connector to the desired position in the first elongated hole and the second connector to the desired position in the second elongated hole. The corresponding nuts are then tightened to lock the first and second connectors.

[0057] As a preferred embodiment, the light source 203 is an LED light source.

[0058] As a preferred embodiment, the total sampling time each time is the time it takes for the elevator to complete a full trip.

[0059] As a preferred embodiment, the non-contact elevator slippage detection device 100 of this embodiment is used to be placed in the elevator machine room to measure the slippage between the elevator traction sheave 4 and the traction rope 3. The traction rope 3 is a steel wire rope. The traction sheave 4 is fixed to the support structure 7, and the traction sheave 4 is driven to rotate by the motor 8. The traction system also includes a guide wheel 9, and the steel wire rope is wound around the traction sheave 4 and the guide wheel 9. It should be noted that this embodiment is not limited to application in elevators, but can also be applied to crane drums and pulley blocks in industrial lifting equipment, mine hoist drums in mine hoisting systems, port gantry crane pulleys in port hoisting equipment, drive wheels and guide wheels in cable cars and ropeway systems, tower crane winches in construction machinery, construction elevator traction sheaves, anchor winches and mooring winches in ships and marine engineering, etc.

[0060] This embodiment systematically overcomes the limitations of traditional detection methods through non-contact measurement, modular adaptation, and data fusion technologies. Its high detection accuracy, zero-wear, long lifespan, rapid deployment, and adaptability to all operating environments provide a reliable technical tool for elevator safety supervision. This embodiment effectively balances safety requirements and economic benefits, driving the elevator maintenance industry toward intelligent and standardized advancements.

[0061] Example 2

[0062] This embodiment provides an elevator slippage detection method based on the non-contact elevator slippage detection device 100 in Embodiment 1, comprising the following steps:

[0063] Start the traction system and make the rotation angle measuring device 2 rotate synchronously with the traction wheel 4 around the axis of the traction wheel 4; monitor the instantaneous speed of the traction rope 3 within the sampling time interval through the non-contact speed meter 1, and monitor the total rotation angle of the traction wheel 4 within the sampling time interval through the rotation angle measuring device 2; obtain the rope line displacement of a point on the traction rope 3 within the sampling time interval through the instantaneous speed of the traction rope 3 within the sampling time interval; obtain the wheel line displacement of a point on the inner bottom wall of the rope groove of the traction wheel 4 within the sampling time interval through the total rotation angle of the traction wheel 4 within the sampling time interval; obtain the difference between the rope line displacement and the wheel line displacement, and the absolute value of the difference between the rope line displacement and the wheel line displacement is the rope slip amount.

[0064] In some specific embodiments, the rotation angle measuring device 2 includes a first bracket 201, a grating disk 202, a light source 203, a photosensitive element 204, and a processor. The grating disk 202 is used to be detachably fixedly connected to the end surface of the traction sheave 4; the light source 203, the photosensitive element 204, and the processor are all mounted on the first bracket 201; the grating disk 202 is provided with a plurality of light-transmitting holes 205 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, and 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; and the processor is used to obtain the total rotation angle of the traction sheave 4;

[0065] The rope displacement is obtained by formula 1; the wheel displacement is obtained by formulas 2 and 3; formula 1 is:

[0066]

[0067] Among them, L rope is the cable displacement, t i is the time of the i-th sampling point, v(t i ) is the instantaneous speed of the traction rope 3 at the i-th sampling point, Δt is the sampling time interval, and n is the total number of sampling points;

[0068] Formula 2 and Formula 3 are:

[0069]

[0070] Among them, L sheave is the rope displacement, θ is the total rotation angle of the traction wheel 4, n is the cumulative number of pulses obtained by the processor according to the pulse signal generated by the photosensitive element 204, N is the number of single-circle light-transmitting holes 205 of the grating disk 202, and R is the radius of the traction wheel 4.

[0071] In some specific embodiments, the method for obtaining Formula 1 includes: performing time integration on the absolute value of the instantaneous velocity to calculate the running distance L of the wire rope within the sampling time interval [t1, t2] rope , and obtain formula 4; use numerical integration methods (such as trapezoidal method) to calculate the discrete velocity data and obtain formula 1.

[0072]

[0073] Wherein, v(t) is the instantaneous speed of the traction rope 3, t1 is the starting time of the sampling time interval, and t2 is the ending time of the sampling time interval.

[0074] In some embodiments, prior to testing, the device is debugged. The following steps are performed: the non-contact speedometer 1 is adjusted to the same height as the center of the wire rope. The non-contact speedometer 1 is moved so that its laser probe faces the wire rope and the laser beam is oriented directly toward the center of the wire rope. The pan / tilt 6 is rotated upward or downward to adjust the pitch angle of the non-contact speedometer 1. The laser incident angle is adjusted to suit different situations, so that the high-power laser emitted by the non-contact speedometer 1 is projected obliquely onto the surface of the wire rope. The laser beam is focused into a spot covering the center of the wire rope. This completes the device debugging. Adjust the height and horizontal position of the rotation angle measuring device 2 so that the light source 203, the center of the photosensor and the center of the light-transmitting hole 205 are aligned, and the light source 203 and the photosensor are placed at corresponding positions on both sides of the grating disk 202. After power is turned on, fine-tune the position of the light source 203 back and forth, and change the distance between the light source 203 and the collimator 206 to change the light beam size to ensure that the light spot completely covers the light-transmitting holes 205 of the two photosensors. At this time, the debugging of the rotation angle measuring device 2 is completed.

[0075] In some embodiments, after the device is debugged, the elevator starts running, the grating disc 202 rotates synchronously with the traction sheave 4, the divergent light of the light source 203 is focused into parallel light bands through the cylindrical lens, the parallel light bands pass through the light transmission holes 205 of the grating disc 202 vertically, the stray light is blocked by the double-hole block, that is, the light passing through the light transmission holes 205 of the grating disc 202 passes through the through holes 208, and the ambient light in other directions is completely blocked to suppress the interference of ambient light and prevent the ambient light from destroying the phase relationship of the two photosensitive sensors. The two photosensitive sensors are A / B phase double photosensitive sensors, which are arranged along the rotation direction of the grating disc 202 with a spacing of 1 / 4 of the interval of the light transmission holes 205, to generate pulses with a phase difference of 90°. The original electrical signals received by the photosensitive sensors are transmitted to the signal pre-processing circuit board 213 for primary processing of the electrical signals, and the processed analog signals are converted into digital square wave pulse signals through the Schmidt trigger 212, and then input to the pulse counter 214 after being shaped by the Schmidt trigger 212. The cumulative pulse number is obtained by the pulse counter 214, and the rotation direction is judged, and after the running is completed, the cumulative pulse number n and the rotation direction are read from the pulse counter 214 module.

[0076] In some embodiments, the linear speed of the steel wire rope is measured in real time based on the laser Doppler frequency shift principle, and millimeter-level displacement detection is realized through high-speed sampling; an external photoelectric encoding device (rotational angle measuring device 2) is synchronously used to obtain the running distance of the traction sheave 4 through grating pulse counting and rotational angle conversion. The two systems independently run, and the slip amount is finally obtained through difference calculation, and the comprehensive accuracy is significantly better than that of the traditional image marking method and the contact type sensor measurement method, which can effectively identify slight slip abnormalities and is suitable for complex working conditions such as oil pollution and vibration.

[0077] In the present application, specific examples are used to illustrate the principles and embodiments of the present application. The above examples are only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific embodiments and application scope will be changed. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A non-contact elevator slippage detection device, characterized in that: It includes a non-contact speedometer and a rotation angle measuring device. The non-contact speedometer is used to measure the instantaneous speed of the traction rope of the traction system; the rotation angle measuring device is used to be arranged outside the traction wheel of the traction system, and the rotation angle measuring device is used to measure the total rotation angle of the traction wheel.

2. The non-contact elevator slippage detection device according to claim 1, characterized in that: The non-contact velocimeter is a Doppler velocimeter.

3. The non-contact elevator slippage 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 used to be detachably fixedly connected to the end face of the traction wheel; the light source, the photosensitive element and the processor are all installed on the first bracket; the grating disk is provided with a plurality of light-transmitting holes along the circumference of the grating, the light source and the photosensitive element are arranged on both sides of the grating disk, and 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 wheel.

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

5. The non-contact elevator slippage detection device according to claim 4, characterized in that: The rotation angle measuring device also includes a double-hole baffle, which is arranged between the grating disk and the photosensor, and has two through holes; the photosensitive element includes two photosensors, each of which is arranged on the first bracket; the two through holes are respectively arranged opposite to the two photosensors, and each through hole can be opposite to one of the light-transmitting holes on the grating disk; the parallel light beam can pass through one of the light-transmitting holes and the corresponding through hole in turn and be received by the corresponding photosensor; each of the photosensors is communicatively connected to the processor.

6. The non-contact elevator slippage detection device according to claim 5, characterized in that: The rotation angle measuring device also includes a shell; the first bracket includes a bracket body and a connecting bracket; the bracket body can produce relative movement perpendicular to the axial direction of the traction wheel relative to the traction wheel; the connecting bracket is movably connected to the bracket body, and the connecting bracket can produce relative movement in the height direction with the bracket body; the shell is movably connected to the connecting bracket, and the shell can produce relative movement with the connecting bracket parallel to the axis direction of the traction wheel; the light source and the collimator are fixedly connected to one end of the shell, and the double-hole baffle, the photosensor and the processor are fixedly connected to the other end of the shell.

7. The non-contact elevator slippage detection device according to claim 3, characterized in that: The grating disk can be magnetically connected to one end surface of the traction wheel.

8. The non-contact elevator slippage detection device according to claim 1, characterized in that: It also includes a second bracket and a pan-tilt head, the pan-tilt head is connected to the second bracket, and the non-contact speed meter is mounted on the pan-tilt head; the second bracket is used to be arranged on one side of the radial direction of the traction wheel, and the second bracket can produce relative movement perpendicular to the axial direction of the traction wheel relative to the traction wheel; the pan-tilt head can adjust the pitch angle and height of the non-contact speed meter.

9. A method for detecting an elevator slippage amount based on the non-contact elevator slippage amount detection device according to any one of claims 1 to 8, characterized in that: The steps include: Start the traction system, monitor the instantaneous speed of the traction rope within the sampling time interval by the non-contact speed meter, and monitor the total rotation angle of the traction wheel within the sampling time interval by the rotation angle measuring device; obtain the rope line displacement of a point on the traction rope within the sampling time interval by the instantaneous speed of the traction rope within the sampling time interval; obtain the wheel line displacement of a point on the inner bottom wall of the rope groove of the traction wheel within the sampling time interval by the total rotation angle of the traction wheel within the sampling time interval; obtain the difference between the rope line displacement and the wheel line displacement, and the absolute value of the difference between the rope line displacement and the wheel line displacement is the rope slip amount.

10. The elevator slippage detection method according to claim 9, 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 used to be detachably fixedly connected to the end surface of the traction wheel; the light source, the photosensitive element, and the processor are all mounted on the first bracket; the grating disk is provided with a plurality of light-transmitting holes along the circumference of the grating; the light source and the photosensitive element are arranged on both 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; and the processor is used to obtain the total rotation angle of the traction wheel; The rope displacement is obtained by formula 1; the wheel displacement is obtained by formulas 2 and 3; formula 1 is: Among them, L rope is the cable displacement, t i is the time of the i-th sampling point, v(t i ) is the instantaneous speed of the traction rope at the i-th sampling point, Δt is the sampling time interval, and n is the total number of sampling points; Formula 2 and Formula 3 are: Among them, Lsheave is the rope displacement, θ is the total rotation angle of the traction wheel, n is the cumulative number of pulses obtained by the processor based on the pulse signal generated by the photosensitive element, N is the number of light-transmitting holes in a single circle of the grating disk, and R is the radius of the traction wheel.

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