Elevator cable tension and break load testing device

Abstract

The utility model provides a kind of elevator cable tensile and broken load testing device, belong to cable testing technical field, including fixed support;Driving device, fixed end is installed on the fixed support, output end is connected with steel wire rope reel through shaft coupling;Steel wire rope, upper end is wound on the steel wire rope reel, lower end is connected with the upper end of the cable to be tested through a cable net cover;A force value sensor is arranged between the steel wire rope and the cable net cover;Loading unit, is hung in the lower end of the cable through another cable net cover;Control device, is installed on the fixed support, with the driving device, the force value sensor and the both ends of the cable are electrically connected respectively.The overall structure of the utility model is simple in design, easy to install, simple in test operation, stable in loading, and highly automated, can be used for simulating the actual operating conditions of elevator cable, and can accurately and reliably test the tensile properties and breaking load of the cable.

Description

Technical Field

[0001] This utility model relates to the field of cable testing technology, specifically to a device for testing the tensile strength and breaking load of elevator cables. Background Technology

[0002] During the operation of the elevator, the cable, as a critical component for power and signal transmission, must withstand frequent dynamic mechanical stresses such as tension and bending over a long period of time. Its tensile strength and breaking load performance directly affect the operational reliability and safety of the elevator system.

[0003] Currently, most existing tensile testing devices and breaking force testing devices apply static tensile force, while elevator cables are subjected to dynamic tensile force under actual operating conditions. Therefore, existing tensile testing devices and breaking force testing devices cannot simulate the actual operating conditions of elevator cables, which leads to inaccurate test results and makes it difficult to truly reflect the mechanical properties of the cable under actual operating conditions.

[0004] Therefore, there is an urgent need in this field to develop a tensile and breaking load testing device that is simple in structure, easy to operate, stable in loading, and reliable in test results. This device can specifically simulate the dynamic tensile force experienced by the elevator cable under actual operating conditions, thereby ensuring that the elevator cable maintains stable performance in actual operation and ensuring its safety in use. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a testing device for the tensile and breaking load of elevator cables. This device can simulate the dynamic stress of elevator cables under actual operating conditions to test their tensile performance and breaking load, thereby improving the accuracy of the test results.

[0006] To achieve the above and other objectives, this utility model is implemented through the following technical solution: This utility model provides a testing device for the tensile and breaking load of a hoist cable, including a fixed bracket; a drive device, with its fixed end mounted on the fixed bracket and its output end connected to a wire rope reel via a coupling; a wire rope, with its upper end wound around the wire rope reel and its lower end connected to the upper end of the cable to be tested via a cable mesh sleeve; a force sensor disposed between the wire rope and the cable mesh sleeve; a loading unit, suspended from the lower end of the cable via another cable mesh sleeve; and a control device, mounted on the fixed bracket and electrically connected to the drive device, the force sensor, and both ends of the cable.

[0007] In one embodiment, the tensile strength of the wire rope is higher than the expected maximum load of the cable.

[0008] In one embodiment, the loading unit includes a load-bearing tray and a set of weights. The load-bearing tray is connected to the cable mesh sleeve via a hook. The set of weights consists of standard weights of different weight specifications. During testing, the set of weights corresponding to the required load weight is placed on the load-bearing tray.

[0009] In one embodiment, the cable mesh is a retractable braided structure that tightly wraps around the outside of the cable, and has an elastic buffer layer inside.

[0010] In one embodiment, the control device has a built-in online conductor resistance monitoring device electrically connected to both ends of the cable.

[0011] In one embodiment, another force sensor is provided between the cable mesh sleeve at the lower end of the cable and the loading unit.

[0012] In one embodiment, a displacement sensor is also included, which is communicatively connected to the control device, for measuring the cable elongation.

[0013] In one embodiment, the displacement sensor is fixed on the fixed bracket and positioned directly opposite the loading unit.

[0014] In one embodiment, the displacement sensor is a laser rangefinder, which is disposed at the lower end of the wire rope and / or the upper end of the loading unit, for measuring the distance between the two cable mesh sleeves.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The overall structure of this utility model is simple, easy to install, easy to test and operate, and stable under load. It is also highly automated and can be used to simulate the actual operating conditions of elevator cables. Through the force sensor and the online conductor resistance monitoring device in the control device, the tensile performance and breaking load of the cable can be accurately and reliably tested to ensure that the quality inspection of the elevator cable is accurate and effective and can be safely and stably used in elevators.

[0017] 2. The loading unit design of this utility model enables precise simulation of the force at the lower end of the cable by adding or removing weights, and it is inexpensive;

[0018] 3. The design of the cable mesh sleeve and elastic buffer layer of this utility model can effectively avoid excessive local stress on the cable and ensure that the tensile force is evenly distributed on the entire circumference of the cable.

[0019] 4. The design of this utility model with two force sensors can monitor the dynamic changes of the tension force on the cable in real time during the test and cross-verify the force measurement results to ensure the reliability of the test data;

[0020] 5. The displacement sensor of this utility model can automatically measure the cable elongation, reducing the workload of operators and further improving the automation level of the entire testing process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a testing device for the tensile and breaking load of a lifting cable according to the present invention. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0023] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0024] In this invention, the serial numbers assigned to components, such as "first," "second," etc., are merely for distinguishing the described objects and have no sequential or technical meaning. The terms "a," "an," or "the," etc., used in this invention do not indicate a quantity limitation, but simply indicate the presence of at least one. The term "connection," unless otherwise specified, includes both direct and indirect connections. The terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, encompassing not only the listed elements but also other elements not expressly listed.

[0025] To avoid confusion with this utility model, some technical features known in the art have not been described.

[0026] Please see Figure 1 This utility model provides a testing device for the tensile and breaking load of elevator cables, including a fixed bracket 1, a driving device 2, a wire rope reel 3, a wire rope 4, a cable mesh sleeve 5, weights 6, and a control device 7.

[0027] The fixed bracket 1 serves as the supporting foundation for the entire testing device. It is made of high-strength metal and can be fixed to the ground or test platform with anchor bolts to ensure that it will not shake under external forces. This ensures the stable operation of the testing device during the test and provides a reliable foundation and safety guarantee for accurate testing.

[0028] The fixed end of the drive device 2 is fixedly installed on the top of the fixed bracket 1, and the output end is connected to the wire rope reel 3 through a coupling. It can achieve precise speed and position control and stable torque output according to the preset program of the controller 7, thereby achieving uniform speed lifting of the cable and simulating the stress conditions of the lifting cable at different speeds in actual use scenarios. Specifically, the drive device 2 can be a high-precision servo motor with characteristics such as small electromechanical time constant and high linearity, which can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft.

[0029] The wire rope reel 3 is connected to the output end of the drive device 2 via a coupling, which can synchronously drive the motor shaft of the drive device 2 to rotate, thereby converting the rotation of the motor shaft into the vertical lifting motion of the wire rope 4 wound on it.

[0030] The upper end of the wire rope 4 is wound on the wire rope reel 3, and the lower end is connected to the upper end of the cable A through a connecting structure (e.g., a hook) and a cable mesh sleeve 5. The wire rope 4 can be made of high-strength, high-flexibility wire rope, and its tensile strength is much higher than the expected maximum load of the cable A under test. During the test, it is responsible for transmitting the tension applied by the drive device 2, and applying the tension evenly to the cable A.

[0031] The loading unit 6 is suspended from the lower end of cable A via cable mesh sleeve 5, and includes a load-bearing tray with hooks and a set of weights. The load-bearing tray is connected to cable mesh sleeve 5 via hooks; the set of weights consists of standard weights of different weight specifications, and the surface of the weights is treated with anti-rust treatment, providing good wear resistance and corrosion resistance. The weight set corresponding to the required load weight is placed on the load-bearing tray to simulate the load that cable A needs to withstand, and the tensile force applied to cable A is adjusted by increasing or decreasing the number of weights.

[0032] Furthermore, the cable mesh sleeve 5 is designed as a retractable braided structure that can tightly wrap around the outside of cable A. The cable mesh sleeve 5 has an internal elastic buffer layer with a uniform structure. When tensile force is transmitted, it can effectively prevent excessive local stress on cable A, ensuring that the tensile force is evenly distributed across the entire circumference of cable A. This makes the stress on cable A more scientific and reasonable, improving the accuracy of test results.

[0033] The control device 7 is mounted on the fixed bracket 1 and is communicatively connected to the drive device 2. The control device 7 integrates a PLC control system and a touchscreen with a human-machine interface. It can automatically control the operating status of the drive device 2 according to preset conditions, realizing automated control of the testing process. The height of the control device 7 should be convenient for operators to operate the touchscreen. Operators can easily set test parameters, including lifting speed, loading time, and tensile threshold, through the touchscreen. The control device 7 has a built-in online conductor resistance monitoring device, which is electrically connected to both ends of cable A to monitor the core resistance value of cable A in real time to determine whether the core of cable A has broken.

[0034] Furthermore, the control device 7 can monitor various data during the test process in real time, including cable resistance value, tensile force, cable elongation, test time, etc., and analyze, process and store the data.

[0035] Regarding the measurement of tensile force, the tensile force at the lower end of cable A is mainly provided by the total weight of loading unit 6, and its static tensile force value is the weight value of loading unit 6. However, since cable A is pulled by drive device 2 during testing, the tensile force value it experiences changes dynamically during the test. Therefore, a force sensor needs to be added to the testing device to monitor the tensile force in real time. Specifically, a force sensor (such as an S-type tensile sensor or a column-type tensile sensor) can be connected in series between wire rope 4 and cable mesh sleeve 5, and the force sensor can be connected to control device 7 for communication. When drive device 2 drives wire rope reel 3 to rotate and winds wire rope 4, the tensile force is transmitted through wire rope 4. This tensile force directly acts on the force sensor connected in series along this path, allowing the sensor to accurately measure the tensile force applied to the upper end of cable A in real time and feed it back to control device 7.

[0036] Furthermore, in order to cross-verify the force measurement results and ensure the reliability of the test data, another force sensor can be connected in series between the cable mesh sleeve 5 at the lower end of cable A and the loading unit 6, and this force sensor can be connected to the control device 7 for communication.

[0037] Regarding the measurement of cable elongation, the cable elongation can be calculated by manually measuring the cable length A before and after the test using a high-precision measuring tape or other length measuring tools. To reduce the workload of operators and further improve the automation of the entire testing process, a displacement sensor can be added to the testing device to automatically measure the cable elongation, and the displacement sensor can be communicatively connected to the control device 7. For example, in some embodiments, a laser displacement sensor is used as the displacement sensor. The laser displacement sensor is fixed on the fixed bracket 1 and positioned directly opposite the load-bearing tray of the loading unit 6. The measured change in the displacement of the load-bearing tray before and after the test is the cable elongation. In other embodiments, the displacement sensor can be a laser rangefinder, located at the lower end of the wire rope 4 and / or the upper end of the loading unit 6, directly used to measure the distance change between the two cable mesh sleeves 5.

[0038] The installation and debugging process of this utility model is as follows: The fixed bracket 1 is securely installed on the test platform using anchor bolts, ensuring that the fixed bracket 1 is horizontal and stable; the drive device 2 is installed, and the wire rope reel 3 and wire rope 4 are connected; two cable mesh sleeves 5 are respectively placed on the upper and lower ends of the cable A to be tested, and then the upper cable mesh sleeve 5 is securely connected to the hook on the wire rope 4, and the lower cable mesh sleeve 5 is securely connected to the hook on the load-bearing tray; the control device 7 is installed, and the electrical wiring between it and each component (including the drive device 2, the online conductor resistance monitoring device, and the displacement sensor) is connected; the weight set is prepared, and the weight of each weight is checked to ensure accuracy; after the device is installed, debugging is performed to check whether the drive device 2 operates normally and whether the functions of the control device 7 are accurate.

[0039] The following section uses the tensile and breaking load tests of the H07BQ-F4G1.5 elevator cable as an example to introduce the specific operation procedures for conducting tensile performance tests and breaking load tests using this utility model:

[0040] 1. Tensile strength test:

[0041] S1. The cable to be tested, A, is vertically suspended on the test device through the cable mesh sleeve 5.

[0042] S2. Place an initial weight of 10kg on the load-bearing tray at the lower end of cable A to straighten cable A. After 5 minutes, use a displacement sensor to record the initial length of the cable as L0 = 1000mm.

[0043] S3. Increase the weight of the weight to 50kg, and set the lifting speed of the drive device 2 to 1mm / min through the control device 7. During the loading process, the control device 7 collects the extension data and tensile data of cable A in real time. The test time is 30min.

[0044] S4. Stop drive device 2, keep cable A suspended, and reduce the weight to 10kg. After 5 minutes, use displacement sensor to record the length of cable A at this time as L1=1008mm, and calculate the extension of cable as ΔL=L1-L0=8mm.

[0045] S5. Based on the judgment, ΔL is within the maximum extension range of 10mm specified in the standard, and there is no accumulation phenomenon in the appearance. The resistance of the cable core wire monitored by the online conductor resistance monitoring device does not show significant changes. Therefore, the tensile performance of the cable is qualified.

[0046] 2. Breaking load test:

[0047] S1. After the tensile performance test is passed, keep the installation state of cable A unchanged, and gradually increase the weight of the weight in increments of 10 kg. Wait 2 minutes after each increase of weight to allow cable A to fully adapt to the load change.

[0048] S2. During the loading process, continuously observe the state of cable A and monitor the resistance of the cable core wire through an online conductor resistance monitoring device. When the total weight of the weights reaches 150kg, a sudden increase in the resistance of the cable core wire is detected, indicating that the cable core wire has broken. Immediately stop adding weights and record the total weight of the weights at this time as 150kg. This weight is the breaking load value of this type of cable.

[0049] In summary, the lifting cable tensile and breaking load testing device provided by this utility model has a simple structure, is easy to install, and is simple to operate. It can simulate actual working conditions and accurately and reliably test the tensile performance and breaking load of the cable, providing an effective technical means for the quality inspection of lifting cables.

[0050] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value. The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An elevator cable tension and break load testing device, comprising: include Fixed bracket; The drive unit has its fixed end mounted on the fixed bracket and its output end connected to the wire rope reel via a coupling. A steel wire rope, with its upper end wound on the steel wire rope reel and its lower end connected to the upper end of the cable to be tested via a cable mesh sleeve; a force sensor is installed between the steel wire rope and the cable mesh sleeve. The loading unit is suspended from the lower end of the cable by another cable mesh sleeve; The control device is mounted on the fixed bracket and is electrically connected to the drive device, the force sensor, and both ends of the cable, respectively.

2. The elevator cable tension and break load testing device of claim 1, wherein, The tensile strength of the wire rope is higher than the expected maximum load of the cable.

3. The elevator cable tension and break load testing apparatus of claim 1, wherein, The loading unit includes a load-bearing tray and a set of weights. The load-bearing tray is connected to the cable mesh sleeve via a hook. The set of weights consists of standard weights of different weight specifications. During testing, the set of weights corresponding to the total weight is placed on the load-bearing tray according to the required load weight.

4. The elevator cable tension and break load testing apparatus of claim 1, wherein, The cable mesh sleeve is a retractable braided structure that tightly wraps around the outside of the cable, and has an elastic buffer layer inside.

5. The lifting cable tensile and breaking load testing device according to claim 1, characterized in that, The control device has a built-in online conductor resistance monitoring device that is electrically connected to both ends of the cable.

6. The elevator cable tension and break load testing apparatus according to claim 1, wherein, Another force sensor is installed between the cable mesh sleeve at the lower end of the cable and the loading unit.

7. The lifting cable tensile and breaking load testing device according to claim 1, characterized in that, It also includes a displacement sensor, which is communicatively connected to the control device, for measuring the cable elongation.

8. The elevator cable tension and break load testing apparatus according to claim 7, wherein, The displacement sensor is fixed on the fixed bracket and positioned directly opposite the loading unit.

9. The elevator cable tension and break load testing apparatus according to claim 7, wherein, The displacement sensor is a laser rangefinder, which is installed at the lower end of the wire rope and / or the upper end of the loading unit, and is used to measure the distance between the two cable mesh sleeves.

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