Fatigue test device and method for elevator nylon guide wheel

Abstract

The invention relates to a fatigue test device and method for an elevator nylon guide wheel. The fatigue test device comprises a test platform; the pressurizing mechanism is arranged on the testing platform and is used for applying an alternating load or a static load to the nylon guide wheel; the temperature control box is connected to the test platform in a relatively movable manner, and a test space for accommodating the nylon guide wheel is formed in the temperature control box; the transmission mechanism is connected with the temperature control box in a matched mode and drives the temperature control box to move relative to the testing platform so that the temperature control box can be opened or closed, and the nylon guide wheel can be taken and placed in the testing space. The actual working temperature condition of the nylon wheel is simulated through the temperature control box, the alternating load or the static load is output to the nylon wheel through the pressurizing mechanism, the fatigue test is carried out under different temperatures and alternating loads, the relatively real working condition is simulated, and the device is suitable for testing nylon wheels of different specifications.

Description

Technical Field

[0001] The invention relates to the technical field of elevator guide wheel testing, and in particular to a fatigue testing device and method for elevator nylon guide wheels. Background Art

[0002] Compared with cast iron guide wheels, nylon guide wheels used in elevators are widely used in elevators because of their light weight, easy installation, low price, noise absorption and shock absorption. For example, the elevator car anti-ropes and counterweight anti-ropes have become one of the mainstream configurations in the suspension system of traction drive elevators. Nylon guide wheels play a very important role in the safe operation of elevators. Once they fail, they directly affect the performance of the elevator. If measures are not taken in time, they may even affect the safe operation of the entire elevator equipment. Therefore, it is necessary to carry out research on the life and fatigue test of elevator nylon guide wheels, explore the failure mechanism, influencing factors and change law of elevator nylon guide wheels through elevator nylon wheel fatigue test, especially detect the use status and life of bearings in nylon wheel components, and provide strong technical support for preventing and solving the fatigue failure of elevator nylon guide wheels. In the existing detection technology, there is a test fixture for nylon wheel bearings, which uses a special speed component to directly contact the nylon wheel and generate extrusion force, so that the speed wheel can rotate synchronously with the nylon wheel until the nylon wheel fails due to fatigue, to determine whether the quality of the nylon wheel is qualified. However, this technology has some problems: first, only the simulation method is used to test the life of the elevator nylon guide wheel, and the influence of the nylon wheel groove on the test is not considered. In actual working conditions, the force relationship between the wheel groove and the wire rope has a certain influence on the operation of the nylon guide wheel; second, the influence of temperature and alternating load on the fatigue life of the nylon guide wheel is not considered, and the actual working conditions and operation complexity of the nylon guide wheel cannot be simulated. Therefore, how to develop a fatigue test device for elevator nylon guide wheels that can simulate relatively real working conditions and perform fatigue tests under different temperatures and alternating loads is an urgent problem that needs to be solved. Summary of the invention

[0003] In view of the technical problems existing in the prior art, the first purpose of the present invention is to provide a fatigue testing device for elevator nylon guide wheels, including a testing platform, a pressurizing mechanism, a temperature control box and a transmission mechanism. Tests are carried out under different temperatures and alternating loads, and relatively real working conditions can be simulated to test fatigue characteristics (obvious deformation, wear, cracks, fractures) and fatigue life and other parameters.

[0004] The second purpose of the present invention is to provide a fatigue test method for elevator nylon guide wheels, which simulates the actual working temperature conditions of the nylon wheel through a temperature control box, outputs alternating loads or static loads to the nylon wheel through a pressurizing mechanism, and performs fatigue tests under different temperatures and alternating loads to simulate relatively real working conditions. The device is suitable for testing nylon wheels of different specifications.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: A fatigue test device for an elevator nylon guide wheel comprises: a test platform; a pressurizing mechanism, which is arranged on the test platform and is used to apply an alternating load or a static load to the nylon guide wheel; a temperature control box, which is connected to the test platform in a relatively movable manner and has a test space for accommodating the nylon guide wheel formed therein; and a transmission mechanism, which is cooperatively connected to the temperature control box and drives the temperature control box to move relative to the test platform to open or close, so that the nylon guide wheel can be taken and placed in the test space.

[0006] Furthermore, the pressurizing mechanism includes: a support frame, which is arranged on the test platform and located outside the temperature control box; a support, which is located in the test space and is used to support and fix the nylon guide wheel; a pressurizing assembly, which includes a connecting rod, a universal pressure head and a pressure plate arranged in series, one end of the connecting rod is arranged on the support frame and connected to a driver, and the other end of the connecting rod extends downward and enters the test space from the top of the temperature control box, and the bottom of the pressure plate is pressed on the circumferential wall of the nylon guide wheel at a certain wrap angle.

[0007] Furthermore, a pressure sensor is also arranged on the connecting rod for monitoring and feeding back the pressure applied to the nylon guide wheel.

[0008] Furthermore, the support frame includes two columns arranged on the test platform and a crossbeam slidably arranged between the two columns for fixing the connecting rod, and the distance between the pressure plate and the nylon guide wheel is adjusted by adjusting the height of the crossbeam.

[0009] Furthermore, the universal pressure head includes an ear seat and a connecting member, the bottom of the ear seat abuts against the pressure plate, the ear seat is provided with a pin, the lower part of the connecting member is movably connected to the ear seat through the pin, and the upper part of the connecting member is detachably connected to the other end of the connecting rod.

[0010] Furthermore, the nylon guide wheel includes an outer wheel body, an inner wheel body and a plurality of reinforcing ribs, one end of each of the plurality of reinforcing ribs is fixed on the inner wheel body, and the other end thereof is extended and fixed toward the outer wheel body at a certain angle, a process orifice plate is arranged between two adjacent reinforcing ribs, a plurality of first wheel grooves for winding steel wire ropes are arranged on the circumferential wall of the outer wheel body, a bearing is arranged on the inner wheel body, a shaft rod is arranged on the bearing, and both ends of the shaft rod are mounted on the support.

[0011] Furthermore, the bottom of the pressing plate has a second wheel groove matching the first wheel groove.

[0012] Furthermore, the temperature control box includes a cover and a box body, the cover plate is arranged on the test platform, one side of the box body is open and slidably connected to the cover plate, the other side of the box body is configured with a heater for adjusting the temperature of the test space, the bottom of the other side of the box body is configured with a support seat for supporting the box body, the support seat makes the other side of the box body leave the ground a certain distance, the bottom of the support seat is configured with a pulley for driving the box body to move, and the outside of the box body is also configured with a controller.

[0013] Furthermore, the transmission mechanism includes a slide rail arranged at the bottom of the cover plate and a slide groove arranged at the bottom of the box body, and the slide rail moves in the slide groove to control the opening or closing operation of the cover plate and the box body.

[0014] According to the method of using the above-mentioned fatigue test device for elevator nylon guide wheels, the method comprises the following steps: The nylon guide wheel to be tested is fixed on the support, and the height of the crossbeam in the support frame is adjusted so that the pressure plate of the pressurizing assembly is pressed on the circumferential wall of the nylon guide wheel at a certain wrap angle; the temperature control box is driven to move relative to the test platform by the transmission mechanism, thereby closing the test space, and the temperature in the test space is adjusted to the preset test temperature by the heater of the temperature control box; the pressurizing assembly is controlled by the driver to apply an alternating load or a static load to the nylon guide wheel, and the pressure value applied to the nylon guide wheel is monitored and recorded by the pressure sensor; the nylon guide wheel is made to work continuously under the preset test conditions to simulate the fatigue process in the actual working conditions.

[0015] The present invention has the following advantages: 1. The fatigue test device for elevator nylon guide wheels of the present invention can simulate various temperature and load changes encountered by nylon guide wheels in actual operation by controlling the temperature conditions in the test space through a temperature control box and combining the alternating load output by a pressurizing mechanism to the nylon guide wheels. This highly simulated test environment makes the test results closer to the actual working conditions, thereby more accurately evaluating the impact of different temperatures and alternating loads on the operating performance of nylon wheels and their bearings.

[0016] 2. The pressurizing mechanism of the present invention includes a support frame, a support and a pressurizing assembly. The pressurizing assembly includes a connecting rod, a universal pressure head and a pressure plate arranged in series. The steel wire rope with a specific wrap angle wrapped around the elevator nylon guide wheel is used as a force transmission medium. These steel wire ropes not only ensure the force balance of each rope on the nylon guide wheel, but also achieve precise positioning and pressure transmission of the steel wire rope through the second wheel groove on the pressure plate, thereby effectively promoting the close fit between the steel wire rope and the nylon guide wheel, and strictly following the strict requirements for the uniform force of the steel wire rope in the industry standard. Such a setting completely eliminates the slipping or sliding problems of the steel wire rope and the nylon guide wheel commonly seen in traditional rope pulling tests, improves the accuracy and reliability of the test, and avoids potential deviations in the test results caused by the slippage of the nylon guide wheel. Furthermore, by applying adjustable and precise force to the pressure plate through the pressure mechanism, the user can flexibly adjust the force and test frequency as needed. At the same time, by using displacement measurement technology (such as built-in displacement sensor in the driver hydraulic cylinder or directly connected to an external dial indicator), real-time and accurate monitoring of the displacement of the pressure plate after force application is achieved, which provides data support for evaluating the fatigue performance of nylon guide wheels under different alternating load conditions and meets complex and changeable testing needs.

[0017] 3. The present invention adopts a movable temperature control box design, which makes the opening and closing operation of the temperature control box simple and quick, and improves the convenience of disassembly and testing of the nylon wheel. In addition, one end of the connecting rod is connected to the pressure sensor, and the other end is in contact with the pressure plate surface through the universal pressure head, which not only ensures the stability of the loading process, but also simplifies the maintenance process and reduces the maintenance cost.

[0018] 4. The present invention can flexibly adapt to the fatigue test of elevator nylon guide wheels of different specifications and sizes by adjusting the crossbeam height of the support frame and the extension length of the driver hydraulic rod, plus the design length of the connecting rod. This height-adjustable design broadens the application scope of the test device and meets the diverse test needs.

[0019] 5. The present invention conducts tests under different temperature conditions and alternating load combinations, and can comprehensively evaluate the quality indicators such as fatigue life, wear and internal cracks of nylon guide wheels under various working conditions. At the same time, it can also conduct comparative tests on different types of elevator anti-ropes (such as nylon pulleys without steel sleeves, nylon pulleys with steel sleeves, steel spoke pulleys and cast iron pulleys), study their failure modes and compare the impact on bearing operating conditions, and provide a scientific basis for the optimal design of elevator systems.

[0020] 6. The present invention can also perform static pressure performance tests through a pressurizing mechanism. This multifunctional testing capability improves test efficiency and enables researchers to obtain more comprehensive performance data in a short period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a three-dimensional structural schematic diagram of a fatigue testing device for elevator nylon guide wheels.

[0022] Figure 2 The present invention is a three-dimensional structural schematic diagram of a fatigue testing device for elevator nylon guide wheels.

[0023] Figure 3 It is a three-dimensional structural schematic diagram of the pressurizing mechanism and the testing platform of the present invention.

[0024] Figure 4 It is a three-dimensional structural schematic diagram of the pressurizing component and the support of the present invention.

[0025] Figure 5 yes Figure 4 main view.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the pressurizing component of the present invention.

[0027] Figure 7 It is a three-dimensional structural schematic diagram of the support of the present invention.

[0028] Figure 8 It is a three-dimensional structural schematic diagram of the nylon guide wheel of the present invention.

[0029] Fig. 9 It is a three-dimensional structural schematic diagram of another embodiment of the pressing plate and nylon guide wheel of the present invention.

[0030] Fig.10 It is a schematic diagram of the three-dimensional structure of another embodiment of the pressing plate of the present invention.

[0031] Fig.11 It is a three-dimensional structural schematic diagram of the universal pressure head of the present invention.

[0032] Fig.12 It is a three-dimensional structural schematic diagram of the ear seat of the present invention.

[0033] Fig.13 It is a three-dimensional structural schematic diagram of the coupling of the present invention.

[0034] Among them, 1 is a test platform, 2 is a pressurizing mechanism, 201 is a support frame, 201a is a column, 201b is a beam, 201b1 is a driving port, 202 is a support, 202a is a support plate, 202b is a fixing block, 202b1 is a fixing groove, 203 is a pressurizing component, 203a is a connecting rod, 203b is a universal pressure head, 203b1 is an ear seat, 203b2 is a connecting shaft, 203b3 is a pin, 203c is a pressure plate, 203c1 is a second wheel groove, 203c2 is a clamping plate, and 203d is a pressure sensor , 3 is a temperature control box, 3a is a test space, 301 is a cover plate, 302 is a box body, 302a is a strip groove, 303 is a support seat, 304 is a pulley, 305 is a controller, 306 is a signal light, 307 is an observation port, 4 is a transmission mechanism, 401 is a slide rail, 402 is a slide groove, 403 is a guide plate, 5 is a nylon guide wheel, 501 is an outer wheel body, 501a is a first wheel groove, 502 is an inner wheel body, 503 is a reinforcing rib, 504 is a steel wire rope, 505 is a bearing, 506 is a shaft rod, and 507 is a process orifice plate. DETAILED DESCRIPTION

[0035] The following description is essentially only exemplary and is not intended to limit the present invention, its application or use. It will be further understood that the term "include" and / or "comprising" specifies the existence of the features, wholes, steps, operations, elements and / or parts described when used in this specification, but does not exclude the existence of one or more other features, wholes, steps, operations, elements, parts and / or its groups or add one or more other features, wholes, steps, operations, elements, parts and / or its groups. As used in this article, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that when an element, component and / or part is referred to as "connected to another element, component and / or part", it can be directly connected to another element, component and / or part, or there can be an intermediate element. It will be understood that although the terms "first", "second" and the like can be used to describe various elements, components and / or parts in this article, these elements, components and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component or part from another element, component or part. Therefore, the first element, component or part discussed below can be referred to as the second element, component or part without departing from the teaching of the present invention. Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meanings as those commonly understood by those of ordinary skill in the field to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the relevant field and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense, unless clearly defined in this article.

[0036] It should be understood that, in order to clearly show the contents therein, the drawings herein are not drawn to scale, and the same or similar reference numerals indicate the same or similar components or parts. In addition, it should be understood that any embodiments described in this application and the technical features included therein can be combined with each other.

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0038] like Figure 1 and Figure 2As shown, a fatigue test device for elevator nylon guide wheels includes a test platform 1, a pressure mechanism 2, a temperature control box 3 and a transmission mechanism 4. The test platform 1 has a pedestal and a table top fixed to the top of the pedestal. The table top is separated from the ground by a certain distance in the pedestal so that there is a certain space between the table top and the ground. The table top is used to place the nylon guide wheel 5, the pressure mechanism 2, the temperature control box and the transmission mechanism 4. The internal space of the pedestal can be used to place equipment such as a drive device and a control system. The table top and the pedestal are both rectangular structures. The pressure mechanism 2 is arranged on the test platform 1, which is used to apply an alternating load or a static load to the nylon guide wheel 5 to simulate the actual load condition of the nylon guide wheel 5 during elevator operation. The temperature control box is connected to the test platform 1 in a relatively movable manner, and a test space 3a for accommodating the nylon guide wheel 5 is formed inside it. The temperature control box is slidably arranged along the length direction of the test platform 1, and its shape is roughly a rectangular box 302. The transmission mechanism 4 is connected with the temperature control box, driving the temperature control box to move relative to the test platform 1 so as to open or close, so that the nylon guide wheel 5 can be taken and placed in the test space 3a. The temperature condition in the test space 3a is controlled by the temperature control box, and the alternating load output by the pressure mechanism 2 to the nylon guide wheel 5 can simulate various temperature and load changes encountered by the nylon guide wheel 5 in actual operation. Among them, the nylon guide wheel can also be other types of elevator reverse rope wheels, such as nylon pulleys without steel sleeves, nylon pulleys with steel sleeves, steel spoke pulleys and cast iron pulleys, etc., which can all be tested using this device.

[0039] like Figure 2-7 As shown, the pressurizing mechanism 2 includes a support frame 201, a support 202 and a pressurizing assembly 203, wherein the support frame 201 is arranged on the test platform 1 and is located outside the temperature control box; the support 202 is located in the test space 3a, and is used to support and fix the nylon guide wheel 5; the pressurizing assembly 203 includes a connecting rod 203a, a universal pressure head 203b and a pressure plate 203c arranged in series, one end of the connecting rod 203a is arranged on the support frame 201 and is connected to a driver (not shown in the figure), and the other end thereof extends downward and enters the test space 3a from the top of the temperature control box, wherein the outer surface of the connecting rod 203a has a thread, the bottom of the pressure plate 203c is pressed on the circumferential wall of the nylon guide wheel 5 at a certain wrap angle, the upper surface of the pressure plate 203c is a plane, and the plane of the pressure plate 203c abuts against the bottom of the universal pressure head 203b. The bottom of the pressure plate 203c is pressed on the top of the nylon guide wheel 5, and its bottom is in an arc shape and cooperates with the circumferential wall of the nylon guide wheel 5. The bottom of the pressure plate 203c can be constructed into arc wrap angles of different sizes according to the different sizes of the nylon guide wheel 5. The wrap angle α is 90-180 degrees, preferably 90 degrees.

[0040] like Figure 1-3As shown, the support frame 201 includes two columns 201a arranged on the test platform 1 and a crossbeam 201b slidably arranged between the two columns 201a for fixing the connecting rod 203a. The distance between the pressing plate 203c and the nylon guide wheel 5 is adjusted by adjusting the height of the crossbeam 201b. The two columns 201a are respectively located at two opposite outer sides of the temperature control box. The two columns 201a extend upward from the test platform 1 to a certain height. The crossbeam 201b is slidably sleeved on the two columns 201a and is located above the temperature control box. The range of adjusting the height of the crossbeam 201b is 0-300mm.

[0041] In an embodiment not shown, the test platform 1 is also provided with a hydraulic drive, which includes a hydraulic cylinder arranged on the test platform 1 and a hydraulic rod telescopically connected to the hydraulic cylinder. The hydraulic rod extends upward from the output end of the hydraulic cylinder to a certain height and is fixedly connected to the end of the crossbeam 201b, so that the hydraulic rod is roughly parallel to the column 201a. The hydraulic cylinder drives the hydraulic rod to telescope back and forth in the vertical direction, and drives the crossbeam 201b to slide up and down between the two columns 201a to adjust the distance between the pressure plate 203c and the nylon guide wheel 5.

[0042] In an embodiment not shown, a cam bearing follower and a locking nut are disposed at the connection between the upright column 201a and the cross beam 201b. When the cross beam 201b is adjusted to a suitable position, the locking nut is tightened to generate a pressing force on the cam bearing follower, thereby locking the height of the cross beam 201b. When the position of the cross beam 201b needs to be adjusted, the locking nut only needs to be rotated in the opposite direction to release the pressing force on the cam bearing follower, so that the height adjustment of the cross beam 201b can be achieved. After the adjustment is completed, the locking nut is tightened again to fix the new position.

[0043] like Figure 2-6As shown, the middle part of the crossbeam 201b has a driving port 201b1 for receiving one end of the connecting rod 203a, and a driver (not shown in the figure) is connected to one end of the connecting rod 203a through the driving port 201b1. The driver includes a hydraulic cylinder and a hydraulic rod telescopically connected to the hydraulic cylinder, and the hydraulic rod passes through the driving port 201b1 and is connected to one end of the connecting rod 203a. One end of the hydraulic cylinder is connected to an external hydraulic system and control system to provide a set static load or alternating load for the hydraulic rod connected to the hydraulic cylinder. The connecting rod 203a is also provided with a pressure sensor 203d, which is used to monitor and feedback the pressure applied to the nylon guide wheel 5, wherein the pressure sensor 203d is arranged at the connection between the hydraulic rod and the connecting rod 203a, the upper end of the pressure sensor 203d is threadedly connected to the hydraulic rod, the lower end of the pressure sensor 203d is threadedly connected to the connecting rod 203a, the pressure sensor 203d is connected in communication with an external control system, and the pressure sensor 203d can collect the thrust output by the hydraulic cylinder in real time, that is, measure the load acting on the nylon guide wheel 5 in real time. In an embodiment not shown, the connecting rod 203a is also provided with a square block, which is used for a wrench to hold the position, and the connecting rod 203a can be rotated under the action of the wrench to achieve detachability, and the connecting rods 203a of different lengths can be replaced according to the size of the nylon guide wheel 5.

[0044] like Figure 11-13As shown, the universal pressure head 203b includes an ear seat 203b1 and a connecting shaft 203b2, the bottom of the ear seat 203b1 abuts against the pressure plate 203c, the ear seat 203b1 is provided with a pin 203b3, the lower part of the connecting shaft 203b2 is movably connected to the ear seat 203b1 through the pin 203b3, and the upper part of the connecting shaft 203b2 is detachably connected to the other end of the connecting rod 203a, and the detachable connection method can be threaded connection, snap connection and hinge connection, etc. The connecting shaft 203b2 has a clamping part, the top of the clamping part has a sleeve threadedly connected to the other end of the connecting rod 203a, the clamping end of the clamping part is movably connected to the pin 203b3, and is positioned by a screw bolt, and its clamping force can be adjusted according to the test force and direction, and the clamping part and the pin 203b3 form a cross bearing structure to achieve universal rotation. When the driver starts to apply the alternating load, the periodically changing force first acts on the connecting rod 203a. Since the connecting rod 203a is fixedly connected to the coupling 203b2, the alternating load will be transferred to the coupling 203b2. As the load changes periodically, the load is then transferred to the ear seat 203b1 through the coupling 203b2, acting on the pressing plate 203c, and finally acting on the nylon guide wheel. At the same time, the coupling 203b2 and the ear seat 203b1 are movably connected by the pin 203b3, which enables the connecting rod 203b2 to rotate or swing in a small range around the pin 203b3 when subjected to the alternating load. This rotation or swing further drives the pressing plate 203c and the nylon guide wheel 5 connected thereto to produce mutual displacement. Due to the periodic change of the alternating load, the displacement between the pressing plate 203c and the nylon guide wheel 5 also presents periodic changes. This displacement change not only realizes the effective application of alternating loads, but also enables the entire structure to adapt to the changing requirements under different working conditions, ensuring the stable operation and precise control of the system. In addition, it should be emphasized that this displacement can be eliminated by fixing the rotation of the nylon guide wheel 5. At this time, the rotation or swing of the universal pressure head 203b can ensure that the pressure block is completely attached to the outer surface of the nylon guide wheel 5 to achieve balanced force.

[0045] like Figure 8As shown, the nylon guide wheel 5 includes an outer wheel body 501, an inner wheel body 502 and a plurality of reinforcing ribs 503, one end of each of the plurality of reinforcing ribs 503 is fixed on the inner wheel body 502, and the other end thereof is extended and fixed toward the outer wheel body 501 at a certain angle, a process orifice plate 507 is arranged between two adjacent reinforcing ribs 503, a plurality of first wheel grooves 501a for winding a steel wire rope 504 are arranged on the circumferential wall of the outer wheel body 501, a bearing 505 is arranged on the inner wheel body 502, wherein a steel inner ring can also be arranged between the inner wheel body and the bearing, a shaft rod 506 is arranged on the bearing 505, and both ends of the shaft rod 506 are mounted on the support 202, wherein the number of the first wheel grooves 501a is 4-8. When the driver is started, the static load or alternating load generated is sequentially transmitted through the connecting rod 203a, the universal pressure head 203b and the pressure plate 203c and acts on the steel wire rope 504 located on the first wheel groove 501a, and then acts on the nylon guide wheel 5 through the steel wire rope 504. The bottom of the pressure plate 203c has a second wheel groove 203c1 matched with the first wheel groove 501a, so that the steel wire rope 504 wound on the first wheel groove 501a is confined between the first wheel groove 501a and the second wheel groove 203c1.

[0046] like Fig. 9 and Fig.10 As shown, another embodiment of the pressing plate 203c is shown in the figure, the bottom of the pressing plate 203c has a second wheel groove 203c1 matched with the first wheel groove 501a, wherein the number of the second wheel groove 203c1 is 4-8, the bottom of the pressing plate 203c has an arc segment and a straight segment arranged at both ends of the arc segment, the arc segment matches the circumferential wall of the nylon guide wheel 5, the steel wire 504 is embedded in the second wheel groove 203c1, and the straight segment is also provided with a clamping plate 203c2 for fixing the steel wire 504 in the second wheel groove 203c1, which serves as a lock buckle for the steel wire 504 in the second wheel groove 203c1, ensuring that the steel wire 504 can remain stable and not shift during the test process. In this arrangement, there is no need to configure the steel wire 504 in the first wheel groove 501a of the nylon guide wheel 5, but the steel wire 504 is embedded in the second wheel groove 203c1, which simplifies the operation process and improves the test efficiency.

[0047] like Figure 7 As shown, the support 202 has a pair of support plates 202a that are relatively arranged, and the pair of support plates 202a are fixed on the test platform 1 and form a space for accommodating the nylon guide wheel 5 therebetween. A fixing block 202b is arranged on the top of the support plate 202a, and the fixing block 202b is connected to the top of the support plate 202a by bolts. A fixing groove 202b1 for setting up the shaft rod 506 of the nylon guide wheel 5 is provided on the fixing block 202b, and the fixing groove 202b1 is a V-shaped structure.

[0048] like Figure 1 and Figure 2 As shown, the temperature control box includes a cover plate 301 and a box body 302, the cover plate 301 is arranged on the test platform 1, one side of the box body 302 is open and slidably connected to the cover plate 301, one side of the box body 302 cooperates with the cover plate 301, and the other side of the box body 302 is configured with a heater (not shown in the figure) for adjusting the temperature of the test space 3a, and the bottom of the other side of the box body 302 is configured with a support seat 303 for supporting the box body 302, and the support seat 303 makes the other side of the box body 302 leave the ground for a certain distance, and the bottom of the support seat 303 is configured with a pulley 304 for driving the box body 302 to move, and the outside of the box body 302 is also configured with a controller 305, and the controller 305 is respectively connected to the pressurizing mechanism 2, the transmission mechanism 4 and the heater circuit. The bottom of the box 302 is also open to form a rectangular through hole. When the cover 301 and the box 302 are closed, the space enclosed by the cover 301, the box 302 and the test platform 1 is the test space 3a. The cover 301 is vertically arranged on the test platform 1, and a U-shaped strip groove 302a is provided on the top of the box 302. The strip groove 302a is 500-1000mm long and 20-80mm wide. Preferably, the length is 820mm and the width is 50mm. The strip groove 302a is not only used to receive and allow the connecting rod 203a to pass through the inside of the test space 3a, but is also equipped with a detachable strip plate (not shown in the figure). When the box 302 is moved to a suitable position, the strip plate cover is arranged on the strip groove 302a, effectively reducing the heat loss in the test space 3a. In addition, both the cover plate 301 and the box body 302 are provided with an observation port 307 for observing the situation of the nylon guide wheel 5 in the test space 3a. A signal light 306 is also arranged on the top of the box body 302, and the signal light 306 is connected to the circuit of the controller 305, and the working status of the box body 302 is visually fed back through color and flashing mode: the red light is on when the operation stops, the green light flashes intermittently during the heating process (the flashing cycle is 1 second), and the green light is always on when the set temperature is reached and maintained. Among them, an insulation layer is also arranged on the inner wall of the box body 302 to prevent heat loss. Among them, the heater heats the gas through a resistance wire to adjust the temperature in the test space 3a, and an air inlet is arranged on the top of the box body 302, with a diameter of 50mm, and an air outlet is arranged on the side of the box body, with a diameter of 50mm, and the air inlet and the air outlet are connected through an external circulating fan.

[0049] In an embodiment not shown, a temperature sensor is also configured in the box 302, and the temperature sensor is respectively connected to the heater and the controller 305 circuit to ensure that the temperature in the test space 3a reaches and maintains the set temperature value, and the temperature range is 25°C-100°C. An illuminator is also configured in the box 302 for clearly observing the situation in the test space 3a. In addition, a refrigerator can also be configured in the box 302, and the refrigerator is used to reduce the temperature in the box 302 to below 0°C to test the fatigue of the nylon guide wheel under low temperature conditions.

[0050] like Figure 1 and Figure 2 As shown, the transmission mechanism 4 includes a slide rail 401 arranged at the bottom of the cover plate 301 and a slide groove 402 arranged at the bottom of the box body 302. The slide rail 401 moves in the slide groove 402 to control the opening or closing operation of the cover plate 301 and the box body 302. There are two slide rails 401 at the bottom of the cover plate 301, and two slide grooves 402 are arranged on both sides of the bottom of the box body 302. Through the interaction between the slide rail 401 and the slide groove 402, the box body 302 can move freely in the horizontal direction in an electric or manual manner, and its travel range is 0-800mm, which is convenient for taking and placing the nylon guide wheel 5. In addition, the top of the cover plate 301 can also be configured with a guide plate 403, which is slidably connected to the inner side of the top of the box body 302 to achieve more accurate docking of the cover plate 301 and the box body 302. In an embodiment not shown, a limit switch is also configured on the test platform 1. The limit switch corresponds to the end of the slide rail 401 and senses the sliding position of the box 302. When the box 302 slides outward and the end of the slide groove 402 reaches the end of the slide rail 401, the limit position of the stroke has been reached. At this time, the limit switch outputs a signal to the control system, which controls the box 302 to stop sliding through the control system to prevent the slide groove 402 from separating and loosening from the slide rail 401.

[0051] In an embodiment not shown, the bottom of the cover 301 is also configured with a sliding base plate, which is fixed on the test platform 1. The cover 301 is slidably mounted on the sliding base plate, and the bottom sides of the box 302 are slidably connected to the cover 301 through guide rods, so that the box 302 can follow the slide rail track more smoothly during movement, thereby further improving the fluency and accuracy of the overall operation.

[0052] According to the method using the above-mentioned fatigue test device for elevator nylon guide wheels, the method comprises the following steps: The nylon guide wheel 5 to be tested is fixed on the support 202, and the height of the beam 201b in the support frame 201 is adjusted so that the pressure plate 203c of the pressurizing assembly 203 is pressed on the circumferential wall of the nylon guide wheel 5 at a certain wrap angle; the temperature control box is driven to move relative to the test platform 1 by the transmission mechanism 4, so as to close the test space 3a, and the temperature in the test space 3a is adjusted to the preset test temperature by the heater and controller 305 of the temperature control box; the pressurizing assembly 203 is controlled by the driver to apply an alternating load or a static load to the nylon guide wheel 5, and the pressure value applied to the nylon guide wheel 5 is monitored and recorded by the pressure sensor 203d; the nylon guide wheel 5 is made to work continuously under the preset test conditions to simulate the fatigue process in the actual working conditions.

[0053] The specific test process is as follows: Test preparation stage: First, turn off the power switch of the temperature control box through the controller 305 to ensure safe operation. Move the box 302 and open the test space 3a to facilitate the installation and fixation of the nylon guide wheel 5 to be tested. Fix the nylon guide wheel 5 on the support 202 to ensure stability without deviation. Adjust the crossbeam 201b in the support frame 201 to a predetermined height and fix it with a locking mechanism so that the pressure plate 203c of the pressurizing assembly 203 can be pressed on the circumferential wall of the nylon guide wheel 5 at a suitable wrap angle. Install the pressure sensor 203d and its connecting parts, including connecting one end of the connecting rod 203a to the lower end of the pressure sensor 203d, and connecting the other end of the connecting rod 203a to the universal pressure head 203b, and select a pressure plate 203c of a suitable size for installation. The steel wire rope 504 is put on the first wheel groove 501a of the nylon guide wheel 5, and then the steel wire rope 504 is put on the second wheel groove 203c1 on the pressure plate 203c in a one-to-one correspondence to ensure uniform loading.

[0054] Closing and temperature adjustment of the test space 3a: The temperature control box is driven by the transmission mechanism 4 to move relative to the test platform 1 to close the test space 3a. The strip plate is used to cover the strip groove 302a on the top of the box body 302 to reduce heat loss. The required test temperature is set on the controller 305 of the temperature control box, and the heater is started to adjust the temperature in the test space 3a to the preset value.

[0055] Loading and test execution: The driver controls the hydraulic rod to extend to an appropriate length, so that the universal pressure head 203b is in full contact with the pressure plate 203c plane, and starts to apply the preset alternating load or static load to the nylon guide wheel 5. The pressure sensor 203d is used to monitor and record the pressure value applied to the nylon guide wheel 5 in real time to ensure the accuracy of the test data. The test time and conditions are set to simulate the fatigue process in actual working conditions, so that the nylon guide wheel 5 can work continuously under the preset test conditions.

[0056] Test observation and evaluation: After a certain period of time, stop the test, open the test space 3a, and check whether the surface of the nylon guide wheel 5 is worn or deformed. Further check whether there is any damage such as cracks inside the nylon guide wheel 5. Observe and evaluate the matching between the hole of the nylon guide wheel 5 and the outer ring of the bearing 505 to comprehensively judge whether the quality of the nylon guide wheel 5 is qualified.

[0057] Example 1 Taking a nylon guide wheel of an elevator as an example, the set alternating load is output by the pressure mechanism 2, and fatigue tests are carried out under different temperatures and alternating loads to simulate relatively real working conditions and observe the deformation and fatigue cracking of the nylon guide wheel 5. The specific test steps are as follows: S1. Test load calculation: When simulating the uniform motion of the elevator, the test load is calculated according to the diameter of the selected nylon guide wheel 5 and the deadweight of the applicable elevator counterweight, the gravity of the compensation chain suspended on the counterweight and other parameters; When simulating elevator braking and deceleration, the maximum force of the counterweight and 1.8 times the weight of the compensation chain hanging on the counterweight (its inertia force is calculated based on the maximum deceleration of 0.8gn) is used as the test load. The test load applied by the pressure mechanism 2 is constant and does not change with the deformation; S2. Test frequency calculation: simulate the rotation of the nylon guide wheel 5 for one cycle; f=v / 2πR, v is the rope speed, R is the pitch circle radius. For example: the rated speed of the elevator is 1.75m / s, R=0.2m, the test frequency of the nylon guide wheel 5 is f=2v / 2πR=2.8, the cycle T=0.36s, the test is 48 hours, and the number of cycles is 480,000 times; the test frequency of the nylon guide wheel 5 is f=v / 2πR=1.4, and the cycle T=0.72s; S3, test preparation: prepare the nylon guide wheel 5 for the elevator, and install it on the support 202 according to the installation requirements of the nylon guide wheel 5; S4. Temperature setting and preheating: Set the temperature of the temperature control box according to the test temperature level, and preheat at the set starting temperature. The preheating duration is 4 hours. S5. Apply alternating load: After preheating, apply alternating force load at each temperature level according to the calculation model of alternating force for 48 hours. Monitor the change of radial deformation during the test, record the whole process in high definition, and extend the test time if necessary. According to the rated speed of the elevator 1.75m / s, R=0,2m, nylon guide wheel 5 cycle T=0.36s, test for 48 hours, equivalent to 480,000 cycles; anti-ropes cycle T=0.72s, test for 48 hours, equivalent to 240,000 cycles.

[0058] S6. Unload and let stand for 30 minutes, then measure the external dimensions of the nylon guide wheel 5 to determine whether it is deformed, observe whether the nylon guide wheel 5 is worn or cracked, and observe the matching between the nylon guide wheel hole and the bearing 505.

[0059] S7. If no serious deformation is found, an alternating load fatigue test is performed at the same setting temperature for 48 hours; S8. Repeat this process to carry out each round of fatigue test with alternating loads; S9. If deformation, wear or cracks, misalignment between the nylon guide wheel hole and the bearing 505, etc. are found, the test is terminated after recording and taking photos.

[0060] S10, recording the number of running cycles and parameters such as the deformation amount of each cycle.

[0061] Among them, for each nylon guide wheel sample, the temperature setting value is tested from low to high.

[0062] In summary, when conducting the test, the change in force during the rotation of the wheel axle was taken into consideration, and the alternating load output by the pressurizing mechanism was converted based on the rotational speed and force, which is more consistent with reality.

[0063] Example 2 Taking a nylon guide wheel of an elevator as an example, according to the above fatigue test method for the nylon guide wheel of an elevator, it can be used for the static pressure test / static load test of the nylon guide wheel. The specific test steps are as follows: S1. Install the nylon guide wheel 5 onto the support 202, install the steel wire rope 504 on the first wheel groove 501a of the nylon guide wheel 5, the wrap angle of the pressure plate 203c is 90°, and the center of the wrap angle is aligned with the weak point (such as the weight reduction hole) of the nylon guide wheel 5; S2, operate the pressurizing mechanism 2, so that the hydraulic rod of the driver applies twice the maximum design load force of the nylon guide wheel 5, and record the relationship between the force and the deformation; S3, the load force is maintained for 1 min, the deformation after the load force is applied is measured, and then the load is unloaded; S4, after unloading and standing for 30 minutes, measure the deformation of the nylon guide wheel 5; S5, gradually increase the load force to 10 times the maximum design load force, record the relationship between the force and the deformation, and repeat steps S3 and S4; observe whether the nylon guide wheel 5 body has any breakage or cracks; S6. If conditions permit, continue loading until the first obvious damage appears, and record the loading force, deformation, duration, and obvious damage location of the entire process.

[0064] In general, the fatigue test device for the elevator nylon guide wheel of the present invention controls the temperature conditions in the test space through the temperature control box, and combines the alternating load output by the pressure mechanism to the nylon guide wheel, so as to simulate various temperature and load changes encountered by the nylon guide wheel in actual operation. This highly simulated test environment makes the test results closer to the actual working conditions, so as to more accurately evaluate the influence of different temperatures and alternating loads on the operating performance of the nylon wheel and its bearings. The pressure mechanism of the present invention includes a support frame, a support and a pressure assembly, and the pressure assembly includes a connecting rod, a universal pressure head and a pressure plate arranged in series, and uses a steel wire rope with a specific wrap angle wrapped around the elevator nylon guide wheel as a force transmission medium. These steel wire ropes not only ensure the force balance of each rope on the nylon guide wheel, but also realize the precise positioning and pressure transmission of the steel wire rope through the second wheel groove on the pressure plate, thereby effectively promoting the close fit between the steel wire rope and the nylon guide wheel, and strictly following the strict requirements for the force uniformity of the steel wire rope in the industry standard. Such a setting completely eliminates the common problem of slipping or sliding of the wire rope and the nylon guide wheel in the traditional rope pulling test, improves the accuracy and reliability of the test, and avoids the potential deviation of the test results caused by the slip of the nylon guide wheel. Furthermore, the pressure mechanism applies an adjustable and precise force to the pressure plate, and the user can flexibly adjust the force and test frequency according to the needs. At the same time, the displacement measurement technology (such as the built-in displacement sensor of the driver hydraulic cylinder or the direct external dial indicator) is used to realize the real-time and accurate monitoring of the displacement of the pressure plate after the force is applied, which provides data support for evaluating the fatigue performance of the nylon guide wheel under different alternating load conditions and meets the complex and changeable test requirements. The present invention adopts a movable temperature control box design, which makes the opening and closing operation of the temperature control box simple and fast, and improves the convenience of disassembly and testing of the nylon wheel. In addition, one end of the connecting rod is connected to the pressure sensor, and the other end is in contact with the pressure plate surface through the universal pressure head. The design not only ensures the stability of the loading process, but also simplifies the maintenance process and reduces the maintenance cost. The present invention can flexibly adapt to fatigue tests of elevator nylon guide wheels of different specifications and sizes by adjusting the crossbeam height of the support frame and the extension length of the driver hydraulic rod, plus the design length of the connecting rod. This height-adjustable design broadens the scope of application of the test device and meets the diverse test requirements. The present invention conducts tests under different temperature conditions and alternating load combinations, and can comprehensively evaluate the quality indicators such as fatigue life, wear and internal cracks of the nylon guide wheel under various working conditions. At the same time, it can also conduct comparative tests on different types of elevator anti-ropes (such as nylon pulleys without steel sleeves, nylon pulleys with steel sleeves, steel spoke pulleys and cast iron pulleys), study their failure modes and compare the effects on bearing operating conditions, and provide a scientific basis for the optimal design of the elevator system. The present invention can also conduct static pressure performance tests through a pressurizing mechanism. This multifunctional testing capability improves the test efficiency, allowing researchers to obtain more comprehensive performance data in a short time.

[0065] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A fatigue test device for elevator nylon guide wheels, characterized in that: include: Test platform; A pressurizing mechanism, which is arranged on the test platform and is used to apply an alternating load or a static load to the nylon guide wheel; A temperature control box, the temperature control box is connected to the test platform in a relatively movable manner, and a test space for accommodating the nylon guide wheel is formed inside the temperature control box; The transmission mechanism is connected with the temperature control box to drive the temperature control box to move relative to the test platform to open or close, so that the nylon guide wheel can be taken and placed in the test space.

2. A fatigue testing device for elevator nylon guide wheels according to claim 1, characterized in that: The pressurizing mechanism comprises: A support frame, the support frame is arranged on the test platform and located outside the temperature control box; A support, the support is located in the test space and is used to support and fix the nylon guide wheel; A pressurizing assembly, the pressurizing assembly includes a connecting rod, a universal pressure head and a pressure plate arranged in series, one end of the connecting rod is arranged on the support frame and connected to a driver, and the other end thereof extends downward and enters the test space from the top of the temperature control box, and the bottom of the pressure plate is pressed on the circumferential wall of the nylon guide wheel at a certain wrap angle.

3. A fatigue testing device for elevator nylon guide wheels according to claim 2, characterized in that: The connecting rod is also provided with a pressure sensor for monitoring and feeding back the pressure applied to the nylon guide wheel.

4. A fatigue testing device for elevator nylon guide wheels according to claim 2, characterized in that: The support frame includes two columns arranged on the test platform and a crossbeam slidably arranged between the two columns for fixing the connecting rod, and the distance between the pressing plate and the nylon guide wheel can be adjusted by adjusting the height of the crossbeam.

5. A fatigue testing device for elevator nylon guide wheels according to claim 2, characterized in that: The universal pressure head includes an ear seat and a connecting shaft. The bottom of the ear seat abuts against the pressure plate. A pin is arranged on the ear seat. The lower part of the connecting shaft is movably connected to the ear seat through the pin. The upper part of the connecting shaft is detachably connected to the other end of the connecting rod.

6. A fatigue testing device for elevator nylon guide wheels according to claim 2, characterized in that: The nylon guide wheel includes an outer wheel body, an inner wheel body and a plurality of reinforcing ribs, one end of each of the plurality of reinforcing ribs is fixed on the inner wheel body, and the other end thereof is extended and fixed toward the outer wheel body at a certain angle, a process orifice plate is arranged between two adjacent reinforcing ribs, a plurality of first wheel grooves for winding steel wire ropes are arranged on the circumferential wall of the outer wheel body, a bearing is arranged on the inner wheel body, a shaft rod is arranged on the bearing, and both ends of the shaft rod are mounted on the support.

7. A fatigue testing device for elevator nylon guide wheels according to claim 6, characterized in that: The bottom of the pressing plate has a second wheel groove matched with the first wheel groove.

8. A fatigue testing device for elevator nylon guide wheels according to claim 1, characterized in that: The temperature control box includes a cover and a box body, the cover plate is arranged on the test platform, one side of the box body is open and slidably connected to the cover plate, the other side of the box body is provided with a heater for adjusting the temperature of the test space, the bottom of the other side of the box body is provided with a support seat for supporting the box body, the support seat makes the other side of the box body leave the ground a certain distance, the bottom of the support seat is provided with a pulley for driving the box body to move, and the outside of the box body is also provided with a controller.

9. A fatigue testing device for elevator nylon guide wheels according to claim 8, characterized in that: The transmission mechanism comprises a slide rail arranged at the bottom of the cover plate and a slide groove arranged at the bottom of the box body, and the slide rail moves in the slide groove to control the opening or closing operation of the cover plate and the box body.

10. A method for using a fatigue testing device for an elevator nylon guide wheel according to any one of the above claims, characterized in that: The method comprises the following steps: Fix the nylon guide wheel to be tested on the support, and adjust the height of the crossbeam in the support frame so that the pressure plate of the pressure assembly is pressed on the circumferential wall of the nylon guide wheel at a certain wrap angle; The temperature control box is driven to move relative to the test platform through the transmission mechanism, thereby closing the test space, and the temperature in the test space is adjusted to the preset test temperature through the heater of the temperature control box; Controlling the pressurizing component through a driver to apply an alternating load or a static load to the nylon guide wheel, and using a pressure sensor to monitor and record the pressure value applied to the nylon guide wheel; The nylon guide wheel is made to work continuously under preset test conditions to simulate the fatigue process in actual working conditions.

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