An elevator steel belt internal and external friction slip simulation test device and method

Abstract

The present invention discloses a device and method for simulating the internal and external friction and slippage of an elevator steel belt, and the device includes a frame, a drive unit, a traction wheel, a steel belt, a wrap angle adjustment unit, a loading unit, and a state monitoring unit. The device and method of the present invention can perform friction and slippage tests on elevator steel belts under various working conditions such as static load, single-end dynamic load, and double-end dynamic load, and can monitor the friction and slippage behaviors of multiple contact points between the steel belt coating and the traction wheel, and the friction and slippage behaviors between the steel core and the coating inside the steel belt in real time, and obtain the correlation between the temperature change of the steel belt coating at the friction interface and the friction and slippage of the coating-traction wheel and the friction and slippage of the steel core-coating.

Description

Technical Field

[0001] The invention relates to the technical field of elevator steel belt testing devices, and in particular to an elevator steel belt internal and external friction slip simulation testing device and method. Background Art

[0002] In recent years, as the elevator traction machine has gradually become lighter and smaller, the traditional wire rope suspension device can no longer meet the use needs of the elevator due to its large space occupation. Non-wire rope suspension devices that save more building space, such as coated belts, have gradually been used in elevators. Steel belts are a type of coated belts, which are composed of a steel core and a coating layer. Compared with traditional wire ropes, steel belts have the advantages of greater friction coefficient, better safety, and longer service life. When the elevator is running, the steel belt will be subjected to vibration loads during the start and braking of the traction machine. Under the action of the vibration load, due to the different material mechanical parameters such as elastic modulus and Poisson's ratio of the steel belt coating layer and the steel core, the elastic deformation of the coating layer made of polyurethane material is greater than that of the steel core, and the elastic deformation of the coating layer has hysteresis, which leads to relative slip between the steel core and the coating layer inside the steel belt; at the same time, the coating layer as a flexible body is deformed by force, and the traction wheel can be regarded as a rigid body, so the coating layer outside the steel belt and the traction wheel will also slip relative to each other. When the tension difference at both ends of the steel belt increases to a certain value, slippage will occur between the steel belt and the traction sheave, causing belt transmission failure, endangering the safe use of the elevator, and even causing accidents resulting in economic losses and casualties. Therefore, a test device and method for simulating internal and external friction and slip of elevator steel belts are proposed, which is of great significance for exploring the dynamic friction and slip behavior between the internal steel core and the coating of the elevator steel belt under simulated actual operating conditions, as well as the dynamic friction and slip behavior between the external coating and the traction sheave.

[0003] Patent No.: 201410261395.0 discloses a dynamic friction transmission test device and method for a mining transmission belt, which can simulate the dynamic friction transmission behavior of a mining transmission belt under dynamic load conditions. However, the device can only dynamically load one end of the belt, and cannot perform a test of dynamic loading on both ends of the belt at the same time. In addition, a connecting rod mechanism is used to drive the roller to twist, which cannot meet the requirements of large torque transmission.

[0004] Patent No.: 201610608263.X discloses a composite steel belt testing device, which is used to conduct destructive tests on steel belts, simulating various situations such as changes in the breaking strength of elevator steel belts after damage, but cannot simulate the friction transmission between the steel belt and the traction wheel.

[0005] The patent number: 202010708884.1 discloses a dynamic test operation device for the friction coefficient between the elevator steel belt and the traction wheel. The device makes the operation of the dynamic test of the friction coefficient between the elevator steel belt and the traction wheel simpler and more convenient, but does not provide a test method for the friction coefficient.

[0006] Patent No.: 202111079872.8 discloses a friction steel belt transmission device and its measuring machine, which uses a steel belt combined with a single-stage reducer for friction transmission. The device is used for the transmission of a three-dimensional coordinate measuring machine and cannot be used for friction transmission testing. None of the above patents involve the simulation and monitoring of the friction slip behavior between the inner core and the coating of the transmission belt. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an elevator steel belt internal and external friction and slip simulation test device and method, which can carry out elevator steel belt friction and slip tests under various working conditions such as static load, single-end dynamic load, and two-end dynamic load, and monitor the friction and slip behavior of multiple contact points between the steel belt coating and the traction wheel, as well as the friction and slip behavior between the steel core inside the steel belt and the coating in real time, and obtain the correlation between the temperature change of the steel belt coating at the friction interface and the friction and slip of the coating-traction wheel and the friction and slip of the steel core-coating.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] An elevator steel belt internal and external friction slip simulation test device includes a frame, a drive unit, a traction wheel, a steel belt, an angle adjustment unit, a loading unit and a state monitoring unit, wherein:

[0010] The frame comprises a base, a vertical plate symmetrically arranged on the base, a load-bearing plate arranged on the upper part of the vertical plate, and a driving device is arranged on the load-bearing plate;

[0011] The traction wheel is drivingly connected to the driving device, the steel belt is wound on the traction wheel, and the steel belt consists of an internal steel core and an external coating layer; a traction wheel notch is provided at the contact section between the wheel groove edge and the steel belt on the traction wheel side, a first steel belt notch is provided at the sections tangent to the traction wheel on both sides of the steel belt, a second steel belt notch is provided at the area on the steel belt edge coating layer that can be observed through the traction wheel notch, and a third steel belt notch is provided at the top surface of the steel belt, and the position of the third steel belt notch on the top surface of the steel belt, the second steel belt notch at the edge of the steel belt, and the position of the traction wheel notch are on the same plane, and the steel core inside the steel belt can be observed through the third steel belt notch on the top of the steel belt;

[0012] The wrap angle adjustment unit is arranged between the base and the bearing plate, and is used to adjust the wrap angle of the steel belt on the traction wheel;

[0013] The loading unit is arranged on the base, and includes a linear lateral moving unit 1 and a linear lateral moving unit 2 symmetrically installed on the base, a vertical driving unit 1 and a vertical driving unit 2 installed on the linear lateral moving unit 1 and the linear lateral moving unit 2, and a steel belt clamp 1 and a steel belt clamp 2 respectively installed on the vertical driving unit 1 and the vertical driving unit 2 through a tension sensor 1 and a tension sensor 2; the two ends of the steel belt are respectively fixed on the steel belt clamp 1 and the steel belt clamp 2;

[0014] The state monitoring unit includes a torque sensor, pressure-sensitive paper, a patch-type temperature sensor, a dynamic tension monitoring unit and a slip monitoring unit; wherein,

[0015] The torque sensor is used to detect the torque when the traction wheel is running to indirectly calculate the friction force between the coating layer and the traction wheel;

[0016] The pressure-sensitive paper is arranged on the area of ​​the traction wheel in contact with the steel belt, and is used to detect the magnitude and distribution of the positive pressure between the steel belt and the traction wheel;

[0017] The patch temperature sensor is arranged on the surface of the coating layer at the notch of the steel strip to monitor the temperature of the friction interface;

[0018] The dynamic tension monitoring unit comprises a tension sensor 1 installed on the piston rod of the vertical drive unit 1 and a tension sensor 2 installed on the piston rod of the vertical drive unit 2;

[0019] The slip monitoring unit is used to monitor the slip conditions between the coating layer and the traction wheel, and between the steel core and the coating layer in real time.

[0020] The driving device comprises a servo motor, a planetary reducer, a coupling, a rotating shaft 1, a bearing seat 1, a rotating shaft 2, a sleeve and a bearing seat 2 arranged on a load-bearing plate; the output shaft of the servo motor is connected to the input shaft of the planetary reducer, the output shaft of the planetary reducer is connected to the rotating shaft 1 through a coupling, the rotating shaft 1 passes through the bearing seat 1 and is connected to the rotating shaft 2 through a torque sensor, the rotating shaft 2 is connected to the traction wheel through a key and passes through the traction wheel to be connected to the bearing seat 2; the sleeve is installed on the rotating shaft 2 for axial positioning of the traction wheel on the rotating shaft 2;

[0021] The traction wheel is installed on the second rotating shaft.

[0022] The wrap angle adjustment unit includes a guide wheel bracket plate arranged between the base and the load-bearing plate, and a guide wheel 1 and a guide wheel 2 arranged on the guide wheel bracket plate; a U-shaped groove is arranged on the guide wheel bracket plate, and the guide wheel 1 and the guide wheel 2 are fixed on the U-shaped groove of the guide wheel bracket plate by nuts, and the two ends of the steel belt pass around the guide wheel 1 and the guide wheel 2 respectively, and the position of the guide wheel 1 and the guide wheel 2 on the guide wheel bracket plate is adjusted by the U-shaped groove to realize the adjustment of the wrap angle of the steel belt on the traction wheel.

[0023] The slip monitoring unit is arranged on the bearing plate, and includes a slip monitoring system 1, a slip monitoring system 2, and a slip monitoring system 3, wherein the slip monitoring system 1 includes a camera bracket 1, an axial high-speed industrial camera 1, and a radial high-speed industrial camera 1; the slip monitoring system 2 includes a camera bracket 2, an axial high-speed industrial camera 2, and a radial high-speed industrial camera 2; the slip monitoring system 3 includes a camera bracket 3, an axial high-speed industrial camera 3, and a radial high-speed industrial camera 3; the lenses of the axial high-speed camera 1, the axial high-speed industrial camera 2, and the axial high-speed industrial camera 3 are facing the traction wheel notch on the side of the traction wheel, and the lenses of the radial high-speed industrial camera 1, the radial high-speed industrial camera 2, and the radial high-speed industrial camera 3 are facing the third steel belt notch on the top surface of the steel belt;

[0024] The slip monitoring unit uses a matching analysis system to calibrate reference points on the shooting screen and track the positions of the reference points, so as to monitor the slip between the coating layer and the traction wheel and between the steel core and the coating layer in real time.

[0025] The linear lateral movement unit is a screw linear module.

[0026] The vertical driving unit is an electric cylinder.

[0027] The steel belt is symmetrically provided with two first steel belt notches on both sides of the traction wheel and in sections tangent to the traction wheel, three second steel belt notches are provided in the area on the edge coating layer of the steel belt that can be observed through the traction wheel notch, and one third steel belt notch is provided on the top surface of the steel belt; the shapes of the above-mentioned steel belt notches are all square, the side lengths of the first steel belt notch and the third steel belt notch are 1.2 to 1.4 times the diameter of the steel core, and the side length of the second steel belt notch is 0.8 to 1 times the diameter of the steel core.

[0028] A test method based on the elevator steel belt internal and external friction slip simulation test device comprises the following steps:

[0029] a. According to the wrap angle of the steel belt on the traction wheel required by the test, make corresponding notches on the traction wheel and the steel belt, then install the traction wheel on the test device, attach the pressure-sensitive paper to the contact area between the traction wheel and the steel belt, and then install the steel belt. Attach the patch temperature sensor to the surface of the coating layer at the notch of the steel belt, adjust the positions of the guide wheel 1 and the guide wheel 2 so that the wrap angle of the steel belt on the traction wheel meets the test requirements, control the linear traverse unit 1 and the linear traverse unit 2 to drive the vertical drive unit 1 and the vertical drive unit 2 to move so that the steel belt between the guide wheel 1 and the steel belt clamp 1, and between the guide wheel 2 and the steel belt clamp 2 is in a vertical state;

[0030] b. Control the vertical drive unit 1 and the vertical drive unit 2 to operate simultaneously, and tension the two ends of the steel belt synchronously until the readings of the tension sensor 1 and the tension sensor 2 reach the initial tension value;

[0031] c. When simulating static load conditions, the vertical drive unit 2 is controlled to act and tension the steel belt until the indication of the tension sensor 2 reaches the set static load value; when simulating single-end dynamic load conditions, the vertical drive unit 2 is controlled to act and tension the steel belt until the indication of the tension sensor 2 reaches the set value, and then the vertical drive unit 2 is controlled to apply an alternating load to the steel belt; when simulating dynamic load conditions at both ends, the vertical drive unit 1 and the vertical drive unit 2 are controlled to synchronously tension the two ends of the steel belt until the indications of the tension sensor 1 and the tension sensor 2 reach the set value, and then the vertical drive unit 1 and the vertical drive unit 2 are controlled to apply a dynamic alternating load to the two ends of the steel belt;

[0032] d. Control the servo motor to drive the traction wheel to perform a reciprocating twist at a small angle, so that friction slip occurs between the coating layer and the traction wheel; the torque of the traction wheel during operation is measured by the torque sensor to indirectly calculate the friction force between the coating layer and the traction wheel, and the dynamic tension change of the steel belt on both sides of the traction wheel is recorded by the tension sensor 1 and the tension sensor 2; the temperature change of the coating layer at the notch of the steel belt is recorded by the patch temperature sensor; the dynamic friction slip between the coating layer and the traction wheel in different contact sections, and the dynamic friction slip between the steel core and the coating layer are recorded by the slip monitoring unit;

[0033] e. When the number of twists of the traction wheel reaches the set value, turn off the servo motor and the vertical drive unit; remove the steel belt from the steel belt clamp 1 and the steel belt clamp 2, take out the pressure-sensitive paper, and measure the positive pressure value and pressure distribution between the steel belt and the traction wheel through the pressure-sensitive paper; calculate the friction coefficient between the coating layer and the traction wheel based on the positive pressure between the steel belt and the traction wheel measured by the pressure-sensitive paper and the friction between the coating layer and the traction wheel measured in step d;

[0034] f. Change the frequency and forward and reverse angle amplitude of the servo motor, the loading frequency and loading force amplitude of the vertical drive unit 1 and the vertical drive unit 2, replace the traction wheel and the matching steel belt with different notch positions, and study the friction and slip behaviors of the coating and the traction wheel at different contact positions under different frequencies, friction and slip amplitudes, loads, and wrap angles, as well as the friction and slip behaviors between the steel core and the coating. According to the test results, the correlation between the temperature change of the coating at the friction interface and the friction and slip between the coating and the traction wheel, and the friction and slip between the steel core and the coating is obtained.

[0035] Beneficial effects:

[0036] 1. The present invention adopts two guide wheels to adjust the wrap angle between the steel belt and the traction wheel. By adjusting the positions of the two guide wheels, the simulated friction slip test under different wrap angle conditions can be carried out; the screw linear module is used to drive the two electric cylinders to move horizontally, which can ensure that the steel belt between the steel belt clamp and the guide wheel is in a vertical state during the test, avoiding the bending stress generated inside the steel belt when the steel belt is bent in this section and affecting the test results.

[0037] 2. The present invention manufactures multiple small notches on the steel belt and the traction wheel and uses multiple high-speed industrial cameras to perform real-time synchronous monitoring of the slip between the steel belt coating and the traction wheel at the notches and between the steel core inside the steel belt and the coating. This can achieve real-time monitoring of the friction and slip behaviors of multiple contact points between the steel belt coating and the traction wheel and between the steel core inside the steel belt and the coating without affecting the transmission effect. The temperature variation law of the coating at the friction interface and its correlation with the friction and slip of the coating-traction wheel and the friction and slip of the steel core-coating can be obtained, providing a method and basis for the service safety assessment and scrapping of the steel belt based on the temperature field and friction and slip.

[0038] 3. By changing the position of the notch on the top surface of the steel belt, the present invention can obtain the relative slip law between the same steel core and the coating layer inside the steel belt at different arc contact positions and the slip law between different steel cores and the coating layer at the same busbar position of the traction wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the present invention;

[0040] Figure 2 It is a front view of the present invention;

[0041] Figure 3 for Figure 2 AA view;

[0042] Figure 4 for Figure 1 A partial enlarged view of part I;

[0043] Figure 5 for Figure 1 Schematic diagram of the structure of the middle steel strip;

[0044] Figure 6 This is a partial enlarged view of the gap between the assembled traction wheel and the steel belt;

[0045] Figure numerals: 1, base; 2, screw linear module 1; 3, vertical plate; 4, electric cylinder 1; 5, tension sensor 1; 6, steel belt clamp 1; 7, guide wheel bracket plate; 8, guide wheel 1; 9, load-bearing plate; 10, seat bearing 2; 11, servo motor; 12, planetary reducer; 13, traction wheel; 14, guide wheel 2; 15, steel belt; 15-1, steel core; 15-2, coating layer; 16, steel belt clamp 2; 17, tension sensor 2; 18, electric cylinder 2; 19, screw linear module 2; 20, sleeve; 21, rotating shaft 2; 22, torque sensor; 2 3. Bearing with seat 1; 24. Rotating shaft 1; 25. Coupling; 26. Slip monitoring system 1; 26-1. Camera bracket 1; 26-2. Axial high-speed industrial camera 1; 26-3. Radial high-speed industrial camera 1; 27. Slip monitoring system 2; 27-1. Camera bracket 2; 27-2. Axial high-speed industrial camera 2; 27-3. Radial high-speed industrial camera 2; 28. Slip monitoring system 3; 28-1. Camera bracket 3; 28-2. Axial high-speed industrial camera 3; 28-3. Radial high-speed industrial camera 3; 29-Pressure sensitive paper; 30-SMD temperature sensor. DETAILED DESCRIPTION

[0046] An embodiment of the present invention is further described below in conjunction with the accompanying drawings.

[0047] like Figures 1 to 4 As shown, the elevator steel belt internal and external friction slip simulation test device of the present invention is mainly composed of a frame, a driving unit, a traction wheel 13, a steel belt 15, a wrap angle adjustment unit, a loading unit, and a state monitoring unit.

[0048] The frame includes a base 1 , a vertical plate 3 symmetrically arranged on the base 1 , and a load-bearing plate 9 arranged on the upper part of the vertical plate 3 .

[0049] The driving device includes a servo motor 11, a planetary reducer 12, a coupling 25, a rotating shaft 24, a bearing seat 23, a rotating shaft 21, a sleeve 20, and a bearing seat 210 arranged on a load-bearing plate 9; the servo motor 11 is connected to the planetary reducer 12, the output shaft of the planetary reducer 12 is connected to the rotating shaft 24 through the coupling 25, the rotating shaft 24 passes through the bearing seat 23, and is connected to the rotating shaft 21 through the torque sensor 22, the rotating shaft 21 is connected to the traction wheel 13 through a key and passes through the traction wheel 13 to be connected to the bearing seat 2 10; the sleeve 20 is installed on the rotating shaft 21, and is used for axial positioning of the traction wheel 13 on the rotating shaft 21.

[0050] The traction wheel 13 is mounted on the second rotating shaft 21, and the steel belt 15 is wound on the traction wheel 13. Figure 5 As shown, the steel belt 15 is composed of an inner steel core 15-1 and an outer coating layer 15-2; a notch is provided in the contact section between the edge of the wheel groove of the traction wheel 13 and the steel belt 15 and the tangent section between the steel belt 15 and the traction wheel 13 on both sides; a notch is provided in the area on the edge coating layer 15-2 of the steel belt 15 that can be observed through the notch of the traction wheel 13; a notch is also provided on the top surface of the steel belt 15, and the notch position on the top surface of the steel belt 15 is in the same plane as the notch position on the edge of the steel belt 15 and the notch position on the traction wheel 13; the steel core 15-1 inside the steel belt 15 can be observed through the notch on the steel belt 15. The notch provided on the assembled traction wheel and the steel belt is shown in FIG. Figure 6 shown.

[0051] The wrap angle adjustment unit includes a guide wheel bracket plate 7 arranged between the base 1 and the load-bearing plate 9, a guide wheel 1 8 and a guide wheel 2 14 arranged on the guide wheel bracket plate 7; a U-shaped groove is arranged on the guide wheel bracket plate 7, and the guide wheel 1 8 and the guide wheel 2 14 are fixed on the U-shaped groove of the guide wheel bracket plate 7 by nuts, and the two ends of the steel belt 15 are respectively passed around the guide wheel 1 8 and the guide wheel 2 14, and the position of the guide wheel 1 8 and the guide wheel 2 14 on the guide wheel bracket plate 7 is adjusted by the U-shaped groove to achieve the adjustment of the wrap angle of the steel belt 15 on the traction wheel 13.

[0052] The loading unit includes a screw linear module 1 2 and a screw linear module 2 19 symmetrically mounted on a base 1 by bolts, an electric cylinder 1 4 and an electric cylinder 2 18 respectively mounted on the screw linear module 1 and the screw linear module 2 19 by bolts, and a steel belt clamp 1 6 and a steel belt clamp 2 16 respectively mounted on the electric cylinder 1 4 and the electric cylinder 2 18 by tension sensor 1 5 and tension sensor 2 17; the two ends of the steel belt 15 are respectively fixed on the steel belt clamp 1 6 and the steel belt clamp 2 16, and the screw linear module 1 2 and the screw linear module 2 19 are controlled to drive the electric cylinder 1 4 and the electric cylinder 2 18 to move so that the steel belt 15 between the guide wheel 1 8 and the steel belt clamp 1 6 and between the guide wheel 2 14 and the steel belt clamp 2 16 is in a vertical state, so as to avoid bending stress inside the steel belt in this section during loading.

[0053] The state monitoring unit includes a torque sensor 22, a pressure-sensitive paper 29, a patch temperature sensor 30, a dynamic tension monitoring unit, and a slip monitoring unit; the torque sensor 22 is installed between the rotating shaft 1 24 and the rotating shaft 21, and the friction between the coating layer 15-2 and the traction wheel 13 is indirectly calculated by detecting the torque when the traction wheel 13 is running; the pressure-sensitive paper 29 is set on the traction wheel 13 in the area in contact with the steel belt 15, and is used to detect the size and distribution of the positive pressure between the steel belt 15 and the traction wheel 13; Figure 6 As shown, the patch temperature sensor 30 is arranged on the surface of the coating layer 15-2 at the notch of the steel strip 15, and is used to monitor the temperature of the friction interface; the dynamic tension monitoring unit includes a tension sensor 15 installed on the piston rod of the electric cylinder 14, and a tension sensor 217 installed on the piston rod of the electric cylinder 218; the slip monitoring unit is arranged on the load-bearing plate 9, including a slip monitoring system 126, a slip monitoring system 27, and a slip monitoring system 328. The slip monitoring system 126 includes a camera bracket 126-1, an axial high-speed industrial camera 126-2, and a radial high-speed industrial camera 126-3. The slip monitoring system 27 includes a camera bracket 27-1, an axial high-speed industrial camera 27-2, and a radial high-speed industrial camera 22 7-3, the slip monitoring system 3 28 includes a camera bracket 3 28-1, an axial high-speed industrial camera 3 28-2, and a radial high-speed industrial camera 3 28-3; the lenses of the axial high-speed camera 1 26-2, the axial high-speed industrial camera 2 27-2, and the axial high-speed industrial camera 3 28-2 are facing the notch on the side of the traction wheel 13, and the lenses of the radial high-speed industrial camera 1 26-3, the radial high-speed industrial camera 2 27-3, and the radial high-speed industrial camera 3 28-3 are facing the notch on the top surface of the steel belt 15; the slip monitoring unit uses a matching analysis system to calibrate reference points on the shooting picture and track the position of the reference points, and monitor the slip between the coating 15-2 and the traction wheel 13 and between the steel core 15-1 and the coating 15-2 in real time.

[0054] The method of using the above elevator steel belt internal and external friction slip simulation test device has the following specific steps:

[0055] a. According to the test requirements, the wrap angle of the steel belt 15 on the traction wheel 13 is made into corresponding notches on the traction wheel 13 and the steel belt 15, and then the traction wheel 13 is installed on the test device. The pressure-sensitive paper 29 is attached to the contact area between the traction wheel 13 and the steel belt 15, and then the steel belt 15 is installed. The surface-mount temperature sensor 30 is attached to the surface of the coating layer 15-2 at the notch of the steel belt 15, and the positions of the guide wheel 18 and the guide wheel 2 14 are adjusted so that the wrap angle of the steel belt 15 on the traction wheel 13 meets the test requirements. The screw linear module 12 and the screw linear module 2 19 drive the electric cylinder 14 and the electric cylinder 2 18 to move so that the steel belt 15 between the guide wheel 18 and the steel belt clamp 16 and between the guide wheel 2 14 and the steel belt clamp 2 16 is in a vertical state;

[0056] b. Controlling the electric cylinder 14 and the electric cylinder 18 to act simultaneously, the ends of the steel belt 15 are tensioned synchronously until the indications of the tension sensor 15 and the tension sensor 17 reach the initial tension value;

[0057] c. When simulating static load conditions, the electric cylinder 2 18 is controlled to act, and the steel belt 15 is stretched until the indication of the tension sensor 2 reaches the set static load value; when simulating single-end dynamic load conditions, the electric cylinder 2 18 is controlled to act, and the steel belt 15 is stretched until the indication of the tension sensor 2 17 reaches the set value, and then the electric cylinder 2 18 is controlled to apply an alternating load to the steel belt 15; when simulating dynamic load conditions at both ends, the electric cylinder 1 4 and the electric cylinder 2 18 are controlled to synchronously stretch the two ends of the steel belt 15 until the indications of the tension sensor 1 5 and the tension sensor 2 17 reach the set value, and then the electric cylinder 1 4 and the electric cylinder 2 18 are controlled to apply a dynamic alternating load to the two ends of the steel belt 15;

[0058] d. Control the servo motor 11 to drive the traction wheel 13 to perform a reciprocating twist at a small angle, so that friction slip occurs between the coating layer 15-2 and the traction wheel 13; the torque of the traction wheel 13 during operation is measured by the torque sensor 22 to indirectly calculate the friction force between the coating layer 15-2 and the traction wheel 13; the dynamic tension change of the steel belt 15 on both sides of the traction wheel 13 is recorded by the tension sensor 15 and the tension sensor 2 17; the temperature change of the coating layer 15-2 at the notch of the steel belt 15 is recorded by the patch temperature sensor 30; the dynamic friction slip between the coating layer 15-2 and the traction wheel 13 in different contact sections and the dynamic friction slip between the steel core 15-1 and the coating layer 15-2 are recorded by the slip monitoring system 1 26, the slip monitoring system 2 27, and the slip monitoring system 3 28;

[0059] e. When the number of twists of the traction sheave 13 reaches the set value, turn off the servo motor 11 and the electric cylinder 14 and the electric cylinder 2 18; remove the steel belt 15 from the steel belt clamp 16 and the steel belt clamp 2 16, take out the pressure-sensitive paper 29, and measure the positive pressure value and pressure distribution between the steel belt 15 and the traction sheave 13 through the pressure-sensitive paper 29; calculate the friction coefficient between the coating layer 15-2 and the traction sheave 13 based on the positive pressure between the steel belt 15 and the traction sheave 13 measured by the pressure-sensitive paper 29 and the friction force between the coating layer 15-2 and the traction sheave 13 measured in step d;

[0060] f. Change the frequency and forward and reverse angle amplitude of the servo motor 11, the loading frequency and loading force amplitude of the electric cylinder 14 and the electric cylinder 2 18, replace the traction wheel 13 and the matching steel belt 15 with different notch positions, and study the friction and slip behaviors of the coating 15-2 and the traction wheel 13 at different contact positions and the friction and slip behaviors between the steel core 15-1 and the coating 15-2 under different frequencies, friction and slip amplitudes, loads, and wrap angles. According to the test results, the correlation between the temperature change of the friction interface coating 15-2 and the friction and slip of the coating 15-2-traction wheel 13 and the friction and slip of the steel core 15-1-coating 15-2 is obtained.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should be regarded as within the scope of protection of the present invention.

Claims

1. An elevator steel belt internal and external friction slip simulation test device, characterized in that: It includes a frame, a driving unit, a traction wheel, a steel belt, an angle adjustment unit, a loading unit and a state monitoring unit, wherein the frame includes a base, a vertical plate symmetrically arranged on the base, a bearing plate arranged on the upper part of the vertical plate, and a driving device is arranged on the bearing plate; The traction wheel is drivingly connected to the driving device, the steel belt is wound on the traction wheel, and the steel belt consists of an internal steel core and an external coating layer; a traction wheel notch is provided at the contact section between the wheel groove edge and the steel belt on the traction wheel side, a first steel belt notch is provided at the sections tangent to the traction wheel on both sides of the steel belt, a second steel belt notch is provided at the area on the steel belt edge coating layer that can be observed through the traction wheel notch, and a third steel belt notch is provided at the top surface of the steel belt, and the position of the third steel belt notch on the top surface of the steel belt, the second steel belt notch at the edge of the steel belt, and the position of the traction wheel notch are on the same plane, and the steel core inside the steel belt can be observed through the third steel belt notch on the top of the steel belt; The wrap angle adjustment unit is arranged between the base and the bearing plate, and is used to adjust the wrap angle of the steel belt on the traction wheel; The loading unit is arranged on the base, and includes a linear lateral moving unit 1 and a linear lateral moving unit 2 symmetrically installed on the base, a vertical driving unit 1 and a vertical driving unit 2 installed on the linear lateral moving unit 1 and the linear lateral moving unit 2, and a steel belt clamp 1 and a steel belt clamp 2 respectively installed on the vertical driving unit 1 and the vertical driving unit 2 through a tension sensor 1 and a tension sensor 2; the two ends of the steel belt are respectively fixed on the steel belt clamp 1 and the steel belt clamp 2; The state monitoring unit includes a torque sensor, pressure-sensitive paper, a patch-type temperature sensor, a dynamic tension monitoring unit and a slip monitoring unit; wherein, The torque sensor is used to detect the torque when the traction wheel is running to indirectly calculate the friction force between the coating layer and the traction wheel; The pressure-sensitive paper is arranged on the area of ​​the traction wheel in contact with the steel belt, and is used to detect the magnitude and distribution of the positive pressure between the steel belt and the traction wheel; The patch temperature sensor is arranged on the surface of the coating layer at the notch of the steel strip to monitor the temperature of the friction interface; The dynamic tension monitoring unit comprises a tension sensor 1 installed on the piston rod of the vertical drive unit 1 and a tension sensor 2 installed on the piston rod of the vertical drive unit 2; The slip monitoring unit is used to monitor the slip between the coating and the traction sheave, and between the steel core and the coating in real time; The wrap angle adjustment unit includes a guide wheel bracket plate arranged between the base and the load-bearing plate, and a guide wheel 1 and a guide wheel 2 arranged on the guide wheel bracket plate; a U-shaped groove is arranged on the guide wheel bracket plate, and the guide wheel 1 and the guide wheel 2 are fixed on the U-shaped groove of the guide wheel bracket plate by nuts, and the two ends of the steel belt pass around the guide wheel 1 and the guide wheel 2 respectively, and the position of the guide wheel 1 and the guide wheel 2 on the guide wheel bracket plate is adjusted by the U-shaped groove to realize the adjustment of the wrap angle of the steel belt on the traction wheel.

2. The elevator steel belt internal and external friction slip simulation test device according to claim 1 is characterized in that: The driving device comprises a servo motor, a planetary reducer, a coupling, a rotating shaft 1, a bearing seat 1, a rotating shaft 2, a sleeve and a bearing seat 2 arranged on a load-bearing plate; the output shaft of the servo motor is connected to the input shaft of the planetary reducer, the output shaft of the planetary reducer is connected to the rotating shaft 1 through a coupling, the rotating shaft 1 passes through the bearing seat 1 and is connected to the rotating shaft 2 through a torque sensor, the rotating shaft 2 is connected to the traction wheel through a key and passes through the traction wheel to be connected to the bearing seat 2; the sleeve is installed on the rotating shaft 2 for axial positioning of the traction wheel on the rotating shaft 2; The traction wheel is installed on the second rotating shaft.

3. The elevator steel belt internal and external friction slip simulation test device according to claim 1, characterized in that: The slip monitoring unit is arranged on the bearing plate, and includes a slip monitoring system 1, a slip monitoring system 2, and a slip monitoring system 3, wherein the slip monitoring system 1 includes a camera bracket 1, an axial high-speed industrial camera 1, and a radial high-speed industrial camera 1; the slip monitoring system 2 includes a camera bracket 2, an axial high-speed industrial camera 2, and a radial high-speed industrial camera 2; the slip monitoring system 3 includes a camera bracket 3, an axial high-speed industrial camera 3, and a radial high-speed industrial camera 3; the lenses of the axial high-speed industrial camera 1, the axial high-speed industrial camera 2, and the axial high-speed industrial camera 3 are facing the traction wheel notch on the side of the traction wheel, and the lenses of the radial high-speed industrial camera 1, the radial high-speed industrial camera 2, and the radial high-speed industrial camera 3 are facing the third steel belt notch on the top surface of the steel belt; The slip monitoring unit uses a matching analysis system to calibrate reference points on the shooting screen and track the positions of the reference points, so as to monitor the slip between the coating layer and the traction wheel and between the steel core and the coating layer in real time.

4. The elevator steel belt internal and external friction slip simulation test device according to claim 1, characterized in that: The linear lateral movement unit is a screw linear module.

5. The elevator steel belt internal and external friction slip simulation test device according to claim 1, characterized in that: The vertical driving unit is an electric cylinder.

6. The elevator steel belt internal and external friction slip simulation test device according to claim 1, characterized in that: The steel belt is symmetrically provided with two first steel belt notches on both sides of the traction wheel and in sections tangent to the traction wheel, three second steel belt notches are provided in the area on the edge coating layer of the steel belt that can be observed through the traction wheel notch, and one third steel belt notch is provided on the top surface of the steel belt; the shapes of the above steel belt notches are all square, the side lengths of the first steel belt notch and the third steel belt notch are 1.2 to 1.4 times the diameter of the steel core, and the side length of the second steel belt notch is 0.8 to 1 times the diameter of the steel core.

7. A test method based on the elevator steel belt internal and external friction slip simulation test device according to any one of claims 1 to 6, characterized in that: The following steps are involved: a. According to the wrap angle of the steel belt on the traction wheel required by the test, make corresponding notches on the traction wheel and the steel belt, then install the traction wheel on the test device, attach the pressure-sensitive paper to the contact area between the traction wheel and the steel belt, and then install the steel belt. Attach the patch temperature sensor to the surface of the coating layer at the notch of the steel belt, adjust the positions of the guide wheel 1 and the guide wheel 2 so that the wrap angle of the steel belt on the traction wheel meets the test requirements, control the linear traverse unit 1 and the linear traverse unit 2 to drive the vertical drive unit 1 and the vertical drive unit 2 to move so that the steel belt between the guide wheel 1 and the steel belt clamp 1, and between the guide wheel 2 and the steel belt clamp 2 is in a vertical state; b. Control the vertical drive unit 1 and the vertical drive unit 2 to operate simultaneously, and tension the two ends of the steel belt synchronously until the readings of the tension sensor 1 and the tension sensor 2 reach the initial tension value; c. When simulating static load conditions, the vertical drive unit 2 is controlled to act and tension the steel belt until the indication of the tension sensor 2 reaches the set static load value; when simulating single-end dynamic load conditions, the vertical drive unit 2 is controlled to act and tension the steel belt until the indication of the tension sensor 2 reaches the set value, and then the vertical drive unit 2 is controlled to apply an alternating load to the steel belt; when simulating dynamic load conditions at both ends, the vertical drive unit 1 and the vertical drive unit 2 are controlled to synchronously tension the two ends of the steel belt until the indications of the tension sensor 1 and the tension sensor 2 reach the set value, and then the vertical drive unit 1 and the vertical drive unit 2 are controlled to apply a dynamic alternating load to the two ends of the steel belt; d. Control the servo motor to drive the traction wheel to perform a small reciprocating twist, so that friction slip occurs between the coating layer and the traction wheel; The torque sensor is used to measure the torque of the traction wheel during operation, and the friction force between the coating and the traction wheel is indirectly calculated. The tension sensor 1 and the tension sensor 2 are used to record the dynamic tension change of the steel belt on both sides of the traction wheel. The patch temperature sensor is used to record the temperature change of the coating at the notch of the steel belt. The slip monitoring unit is used to record the dynamic friction slip between the coating and the traction wheel in different contact sections, and the dynamic friction slip between the steel core and the coating. e. When the number of twists of the traction wheel reaches the set value, turn off the servo motor and the vertical drive unit; remove the steel belt from the steel belt clamp 1 and the steel belt clamp 2, take out the pressure-sensitive paper, and measure the positive pressure value and pressure distribution between the steel belt and the traction wheel through the pressure-sensitive paper; calculate the friction coefficient between the coating layer and the traction wheel based on the positive pressure between the steel belt and the traction wheel measured by the pressure-sensitive paper and the friction between the coating layer and the traction wheel measured in step d; f. Change the frequency and forward and reverse angle amplitude of the servo motor, the loading frequency and loading force amplitude of the vertical drive unit 1 and the vertical drive unit 2, replace the traction wheel and the matching steel belt with different notch positions, and study the friction and slip behaviors of the coating and the traction wheel at different contact positions under different frequencies, friction and slip amplitudes, loads, and wrap angles, as well as the friction and slip behaviors between the steel core and the coating. According to the test results, the correlation between the temperature change of the coating at the friction interface and the friction and slip between the coating and the traction wheel, and the friction and slip between the steel core and the coating is obtained.

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