Elevator weighing system and elevator

Abstract

This utility model discloses an elevator weighing system and an elevator. The elevator weighing system includes a first Hall sensor, a second Hall sensor, and a control module. The first and second Hall sensors are used to sample the vibration frequencies at different locations of the elevator's wire rope and generate a first sampling signal and a second sampling signal, respectively. The control module is used to calculate the elevator's weight based on the first and second sampling signals. This elevator weighing system and elevator can calculate the actual weight of the elevator based on the string vibration equation, achieving non-contact dynamic weighing with advantages such as high accuracy, fast response, and ease of maintenance. By setting sampling points at both the elevator rope head plate and the rope sheave, multi-point sampling eliminates resonance interference during elevator operation, effectively improving sampling accuracy. By setting a shielding shell, the frequency acquisition signal-to-noise ratio is increased to over 45dB.

Description

Technical Field

[0001] This utility model belongs to the field of elevator safety monitoring technology, specifically relating to an elevator weighing system and an elevator. Background Technology

[0002] Elevator load measurement is a core component in ensuring safe elevator operation. In existing technologies, the car bottom weighing sensor is easily affected by car deformation, with a measurement error rate reaching 3% to 5%; the machine room rope head weighing device suffers from mechanical transmission lag, resulting in a dynamic response time exceeding 0.5 seconds. Furthermore, traditional solutions are constrained by the elevator structure, making installation and adjustment difficult, and subsequent maintenance also challenging.

[0003] Market research shows that over 68% of elevator safety accidents are related to inaccurate load monitoring, with overloading causing fatigue fractures of steel wire ropes accounting for 37% of these accidents. Therefore, developing a new load measurement system with strong real-time performance, high accuracy, and ease of maintenance has become an urgent need for the industry.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to provide an elevator weighing system and an elevator that can solve the problem of large errors in elevator load measurement.

[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0007] An elevator weighing system includes: a first Hall sensor mounted on the elevator's rope head plate, the first Hall sensor being used to sample the vibration frequency of the wire rope on the rope head plate and generate a first sampling signal; a second Hall sensor mounted on the elevator's rope sheave, the second Hall sensor being used to sample the vibration frequency of the wire rope on the rope sheave and generate a second sampling signal; and a control module connected to the first Hall sensor and the second Hall sensor to receive the first sampling signal and the second sampling signal, the control module being used to calculate the weight of the elevator based on the first sampling signal and the second sampling signal.

[0008] In one or more embodiments of the present invention, the elevator weighing system further includes a first shielding shell, which is installed on the outside of the elevator wire rope and fixedly installed on the elevator rope head plate, and the first Hall sensor is fixedly installed inside the first shielding shell; and / or the elevator weighing system further includes a second shielding shell, which is installed on the outside of the elevator wire rope and fixedly installed on the elevator rope pulley, and the second Hall sensor is fixedly installed inside the second shielding shell.

[0009] In one or more embodiments of the present invention, the elevator weighing system further includes a filtering module, which is connected to a first Hall sensor and a second Hall sensor to filter the first sampling signal and the second sampling signal.

[0010] In one or more embodiments of the present invention, the elevator weighing system further includes a first vibration sensor, which is fixedly installed with a first Hall sensor. The first vibration sensor is used to sample its own vibration frequency and generate a first vibration signal. The filtering module is connected to the first vibration sensor to filter the first sampled signal based on the first vibration signal. And / or the elevator weighing system further includes a second vibration sensor, which is fixedly installed with a second Hall sensor. The second vibration sensor is used to sample its own vibration frequency and generate a second vibration signal. The filtering module is connected to the second vibration sensor to filter the second sampled signal based on the second vibration signal.

[0011] In one or more embodiments of this utility model, the filtering module includes a high-pass filter.

[0012] In one or more embodiments of the present invention, the elevator weighing system further includes a temperature sensor for sampling temperature to generate a temperature signal, and the control module is connected to the temperature sensor to correct and calculate the weight of the elevator based on the temperature signal; and / or the elevator weighing system further includes an early warning module connected to the control module to issue an alarm based on the control of the control module.

[0013] In one or more embodiments of this utility model, the sampling frequency of the first Hall sensor and / or the second Hall sensor is greater than or equal to 10kHz.

[0014] In one or more embodiments of this utility model, the control module includes an ARM Cortex-M7 processor.

[0015] In one or more embodiments of the present invention, the elevator weighing system further includes a storage module, which is connected to the control module to store data.

[0016] A specific embodiment of this utility model also provides an elevator, including the elevator weighing system described above.

[0017] Compared with existing technologies, the elevator weighing system and elevator of this invention measure the actual weight of the elevator by sampling the vibration frequency of the elevator wire rope and based on the string vibration equation, thus realizing non-contact dynamic weighing. It has the advantages of high accuracy, fast response and easy maintenance.

[0018] By setting sampling points at both the elevator rope head plate and the rope sheave, multi-point sampling eliminates resonance interference during elevator operation, effectively improving sampling accuracy. The use of a shielding shell further enhances the frequency acquisition signal-to-noise ratio to over 45dB. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the elevator weighing system in one embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the installation structure of the first Hall sensor in one embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the installation structure of the second Hall sensor in one embodiment of the present invention. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0024] The terms "coupled," "connected," or "linked" in this specification include both direct and indirect connections. Indirect connections are those made through an intermediate medium, such as those made through an electrically conductive medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in this specification, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0025] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.

[0026] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0027] For the purposes of this application, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this application, the phrase "A, B and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0028] Various components and devices may be mentioned or shown in the singular form herein, but only for the convenience of discussion, and any element mentioned in the singular form may include multiple such elements as taught herein.

[0029] The description uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," each of which can refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used in relation to embodiments of this application are synonymous.

[0030] like Figures 1-3As shown, the elevator weighing system in one embodiment of this utility model includes a first shielding shell 11, a first Hall sensor 12, a second shielding shell 21, a second Hall sensor 22, a control module 30, a temperature sensor, a filtering module 40, an early warning module 50, and a storage module 60.

[0031] The first shielding shell 11 is installed on the outside of the elevator wire rope and fixedly installed on the elevator rope head plate. The first Hall sensor 12 is fixedly installed inside the first shielding shell 11. The first Hall sensor 12 is used to sample the vibration frequency of the wire rope on the rope head plate and generate a first sampling signal.

[0032] The second shielding shell 21 is installed on the outside of the elevator wire rope and fixedly installed with the elevator sheave. The second Hall sensor 22 is fixedly installed inside the second shielding shell 21. The second Hall sensor 22 is used to sample the vibration frequency of the wire rope on the sheave and generate a second sampling signal.

[0033] The filtering module 40 is connected to the first Hall sensor 12 and the second Hall sensor 22 to filter the first sampling signal and the second sampling signal.

[0034] The control module 30 is connected to the filtering module 40 to receive the filtered first sample signal and the filtered second sample signal. The control module 30 is used to calculate the weight of the elevator based on the filtered first sample signal and the filtered second sample signal.

[0035] A temperature sensor is used to sample the temperature and generate a temperature signal. The control module 30 is connected to the temperature sensor to calculate the weight of the elevator based on the temperature signal.

[0036] The early warning module 50 is connected to the control module 30 to issue an alarm based on the control of the control module 30. The storage module 60 is connected to the control module 30 to store data.

[0037] According to the string vibration equation: Where f is the vibration frequency of the wire rope, L is the effective length of the wire rope, and T is the tension of the wire rope. Given the material density of the wire rope, and its effective length and material density, the tension of the wire rope can be calculated by measuring its vibration frequency, and then further converted into the weight of the elevator.

[0038] At the rope end plate, one end of the wire rope is fixed to the rope end plate, while the other end hangs down (or is pulled up in some cases). At the traction sheave or guide sheave, the wire rope is not fixed. The vibration frequency of the wire rope at these two locations will also deviate. The vibration frequency of the wire rope at these two locations is sampled by the first Hall sensor 12 and the second Hall sensor 22, respectively. The control module 30 can process the first and second sampled signals through methods such as dual-node difference algorithm and mean algorithm to improve the sampling accuracy and eliminate resonance interference during elevator operation. At the same time, by setting the first shielding shell 11 and the second shielding shell 21, electromagnetic interference can be effectively prevented, and the signal-to-noise ratio of the vibration frequency acquisition can be improved to over 45dB.

[0039] Combination Figure 1 , 2 As shown, in one embodiment, the rope end plate is fixedly installed in the elevator machine room. The first shielding shell 11 is a metal shell, which is installed at the bottom of the rope end plate. The top and bottom plates of the first shielding shell 11 are provided with through holes for the steel wire rope to pass through. The first Hall sensor 12 is fixedly installed on the inner wall of the first shielding shell 11 and faces the steel wire rope to facilitate sampling the vibration frequency of the steel wire rope.

[0040] Preferably, the elevator weighing system further includes a first vibration sensor 13, which is fixedly installed with a first Hall sensor 12. Specifically, both the first vibration sensor 13 and the first Hall sensor 12 are fixedly installed inside the first shielding shell 11. The first vibration sensor 13 is used to sample its own vibration frequency and generate a first vibration signal. The filtering module 40 is connected to the first vibration sensor 13 to filter the first sampled signal based on the first vibration signal.

[0041] Specifically, even though the rope end plate and the first shielding shell 11 are fixedly installed between themselves and the machine room, vibration is still inevitable. When the first Hall sensor 12 collects the high-frequency vibration of the wire rope, it will also be affected by its own vibration. Since the first vibration sensor 13 and the first Hall sensor 12 are both installed inside the first shielding shell 11, they can be considered to vibrate synchronously. By sampling its own vibration frequency, the filtering module 40 can easily filter out the self-vibration interference of the first Hall sensor 12 from the first sampled signal, thus obtaining more accurate wire rope vibration data.

[0042] In other embodiments, the first shielding shell 11 may be omitted, and the first Hall sensor 12 may be directly mounted on the rope end plate.

[0043] Combination Figure 1 , 3As shown, in one embodiment, the elevator sheave includes a traction sheave, a guide sheave, etc. The second shielding shell 21 is a metal outer shell, installed at the bottom of the traction sheave mounting bracket. Both the top and bottom plates of the second shielding shell 21 have through holes for the wire rope to pass through, allowing the wire rope to move freely when the traction sheave rotates. The second Hall sensor 22 is fixedly installed on the inner wall of the second shielding shell 21, facing the wire rope, to facilitate sampling the vibration frequency of the wire rope.

[0044] Preferably, the elevator weighing system further includes a second vibration sensor 23, which is fixedly installed with the second Hall sensor 22. Specifically, both the second vibration sensor 23 and the second Hall sensor 22 are fixedly installed inside the second shielding shell 21. The second vibration sensor 23 is used to sample its own vibration frequency and generate a second vibration signal. The filtering module 40 is connected to the second vibration sensor 23 to filter the second sampled signal based on the second vibration signal.

[0045] Specifically, vibration interference is also introduced due to factors such as the operation of the traction sheave itself. By sampling the vibration frequency of the traction sheave by the second vibration sensor 23, the filtering module 40 can easily filter out these external interference quantities from the second sampled signal to obtain more accurate wire rope vibration data.

[0046] In other embodiments, the second shielding shell 21, the second Hall sensor 22, and the second vibration sensor 23 can also be installed on the elevator guide wheel. The specific installation method is the same as that at the traction sheave, and will not be described in detail here.

[0047] In other embodiments, the second shielding shell 21 may be omitted, and the second Hall sensor 22 may be directly mounted on the rope end plate.

[0048] Preferably, the sampling frequency of the first Hall sensor 12 and the second Hall sensor 22 is greater than or equal to 10kHz, which enables high-precision sampling of high-frequency vibrations on the wire rope.

[0049] In other embodiments, the filtering module 40 may also include a high-pass filter. Since the vibration on the wire rope is a high-frequency vibration, while the interference caused by external factors is generally of a low frequency, the high-pass filter filters out these low-frequency interferences, retains the vibration of the wire rope, and improves the sampling accuracy. Alternatively, the filtering module 40 may not be provided, in which case the first and second sampled signals are not filtered.

[0050] In one embodiment, two temperature sensors are provided, namely temperature sensor 14 and temperature sensor 24. Temperature sensor 14 is installed inside the first shielding shell 11, and temperature sensor 24 is installed inside the second shielding shell 21. The two temperature sensors can detect the temperature at different locations respectively.

[0051] In other embodiments, one or more temperature sensors may be provided, and these sensors may be placed in other locations as needed and in accordance with actual conditions. Alternatively, no temperature sensors may be provided, in which case the elevator weight is corrected and calculated based on temperature.

[0052] Ambient temperature affects the elastic coefficient and expansion coefficient of the wire rope, which in turn causes changes in parameters such as the wire rope's linear density, tension, and actual length. The control module 30 can perform compensation calculations on these parameters based on the sampled temperature, thereby correcting the actual weight of the elevator. The specific methods for correcting the elevator weight based on temperature are well known to those skilled in the art, and the specific principles will not be elaborated here.

[0053] Preferably, the control module 30 includes an ARM Cortex-M7 processor with a processing speed of 320 DMIPS, ensuring real-time elevator weight calculation. When the control module 30 detects an elevator overload, it can control the early warning module 50 to issue an alarm. The storage module 60 can store elevator load data, multiple sets of characteristic parameter libraries for different types of wire ropes, etc., and supports various functions such as on-site calibration, dynamic record query, and historical data encryption.

[0054] Preferably, the early warning module 50 has an RS485 / Modbus interface, which can be linked with the elevator control system to realize overload protection. Specifically, the early warning module 50 can be an audible and visual alarm.

[0055] In other embodiments, the warning module 50 and / or storage module 60 may not be provided.

[0056] This embodiment also provides an elevator, including the elevator weighing system described above.

[0057] In actual operation, the vibration frequency of the elevator wire rope at different locations is sampled by the first Hall sensor 12 and the second Hall sensor 22. The filter module 40 filters out various interference signals, and the control module 30 calculates the actual weight of the elevator based on the string vibration equation, realizing non-contact dynamic weighing, which has the advantages of high accuracy, fast response and easy maintenance.

[0058] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0059] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An elevator weighing system, characterized in that, include: The first Hall sensor is installed on the rope head plate of the elevator. The first Hall sensor is used to sample the vibration frequency of the wire rope on the rope head plate and generate a first sampling signal. The second Hall sensor is installed on the elevator's pulley. The second Hall sensor is used to sample the vibration frequency of the wire rope on the pulley and generate a second sampling signal. A control module, connected to a first Hall sensor and a second Hall sensor, receives a first sampling signal and a second sampling signal. The control module is used to calculate the weight of the elevator based on the first sampling signal and the second sampling signal.

2. The elevator weighing system according to claim 1, characterized in that, The elevator weighing system further includes a first shielding shell, which is installed on the outside of the elevator's wire rope and fixedly installed on the elevator's rope head plate. The first Hall sensor is fixedly installed inside the first shielding shell; and / or The elevator weighing system also includes a second shielding shell, which is installed on the outside of the elevator's wire rope and fixedly installed on the elevator's sheave. The second Hall sensor is fixedly installed inside the second shielding shell.

3. The elevator weighing system according to claim 1, characterized in that, The elevator weighing system also includes a filtering module, which is connected to the first Hall sensor and the second Hall sensor to filter the first sampling signal and the second sampling signal.

4. The elevator weighing system according to claim 3, characterized in that, The elevator weighing system further includes a first vibration sensor, which is fixedly installed with a first Hall sensor. The first vibration sensor is used to sample its own vibration frequency and generate a first vibration signal. The filtering module is connected to the first vibration sensor to filter the first sampled signal based on the first vibration signal; and / or The elevator weighing system also includes a second vibration sensor, which is fixedly installed with a second Hall sensor. The second vibration sensor is used to sample its own vibration frequency and generate a second vibration signal. The filtering module is connected to the second vibration sensor to filter the second sampled signal based on the second vibration signal.

5. The elevator weighing system according to claim 3, characterized in that, The filtering module includes a high-pass filter.

6. The elevator weighing system according to claim 1, characterized in that, The elevator weighing system also includes a temperature sensor, which samples the temperature to generate a temperature signal. The control module is connected to the temperature sensor to correct and calculate the elevator's weight based on the temperature signal; and / or The elevator weighing system also includes an early warning module, which is connected to the control module to issue an alarm based on the control of the control module.

7. The elevator weighing system according to claim 1, characterized in that, The sampling frequency of the first Hall sensor and / or the second Hall sensor is greater than or equal to 10kHz.

8. The elevator weighing system according to claim 1, characterized in that, The control module includes an ARM Cortex-M7 processor.

9. The elevator weighing system according to claim 1, characterized in that, The elevator weighing system also includes a storage module, which is connected to the control module to store data.

10. An elevator, characterized in that, Includes the elevator weighing system as described in any one of claims 1 to 9.

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