CN113074801A - Real-time monitoring device and method for weighing sensor of aerial work platform - Google Patents
Real-time monitoring device and method for weighing sensor of aerial work platform Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
- B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention provides a real-time monitoring device and a method for a weighing sensor of an aerial work platform, wherein the real-time monitoring device comprises: the detection unit is used for detecting real-time state parameters of the weighing sensor and comparing the real-time state parameters with a normal value range, wherein the real-time state parameters comprise one or more of an inclination angle, vibration, displacement, impact and free falling state of the weighing sensor; and the alarm unit is used for giving an alarm when the real-time state parameters are not in the normal value range. According to the real-time monitoring device and method, the weighing sensor with multiple monitoring indexes is adopted for real-time monitoring, multiple safety designs are provided, the real-time state of the weighing sensor can be effectively monitored, an alarm is given in time, and the safety and reliability of the aerial work platform are improved.
Description
Technical Field
The invention mainly relates to the field of aerial work platform equipment, in particular to a real-time monitoring device and method for an aerial work platform weighing sensor.
Background
The aerial work platform equipment is widely applied to movable system equipment in various industries, such as aerial work, equipment installation, debugging and the like. When the aerial work platform is in operation and use, the load and the posture of the platform are required to be ensured within an allowable safety range so as to ensure the safety of workers in the platform.
As an important safety device in aerial work platforms, the weighing sensor needs to provide accurate and reliable measurement results. Therefore, the safety state of the weighing sensor of the aerial work platform needs to be monitored in real time so as to ensure the safety of the aerial work platform and the measurement precision of the weighing sensor.
Disclosure of Invention
The invention aims to provide a safe and reliable real-time monitoring device and method for a weighing sensor of an aerial work platform.
In order to solve the technical problem, the invention provides a real-time monitoring device of a weighing sensor of an aerial work platform, which is characterized by comprising the following components: the detection unit is used for detecting real-time state parameters of the weighing sensor and comparing the real-time state parameters with a normal value range, wherein the real-time state parameters comprise one or more of an inclination angle, vibration, displacement, impact and free falling state of the weighing sensor; and the alarm unit is used for giving an alarm when the real-time state parameters are not in the normal value range.
In some embodiments, the real-time status parameter is detected using an accelerometer.
In some embodiments, the real-time status parameters further include a natural frequency of the load cell, the natural frequency being related to a loaded weight of the load cell.
In some embodiments, the detection unit detects the natural frequency when the load cell is in a steady state.
In some embodiments, the detection unit includes an acceleration sensor that detects a vibration frequency of the load cell.
In some embodiments, the weighing system further comprises a filtering unit for filtering a loaded weight signal of the weighing sensor, and the filtering characteristic parameters of the filtering unit are adjusted according to the vibration frequency to eliminate the influence of the vibration on the measurement accuracy of the loaded weight and the natural frequency.
In some embodiments, the weighing system further comprises an inclination angle compensation unit, and the inclination angle compensation unit compensates the weighing result of the weighing sensor according to the inclination angle, so that the influence of the inclination angle on the measurement accuracy of the loaded weight is eliminated.
The invention also provides a real-time monitoring method of the aerial work platform weighing sensor for solving the technical problems, which is characterized by comprising the following steps: detecting real-time state parameters of the weighing sensor, and comparing the real-time state parameters with a normal value range, wherein the real-time state parameters comprise one or more of an inclination angle, vibration, displacement, impact and a free-fall state of the weighing sensor; and when the real-time state parameter is not in the normal value range, sending an alarm.
In some embodiments, the real-time status parameters further include a natural frequency of the load cell, the natural frequency being related to a loaded weight of the load cell.
In some embodiments, the natural frequency is detected while the load cell is in a steady state.
In some embodiments, further comprising detecting a vibration frequency of the load cell.
In some embodiments, the method further comprises filtering the loaded weight signal of the weighing sensor according to the vibration frequency, and eliminating the measurement accuracy influence of the vibration on the loaded weight and the natural frequency.
In some embodiments, the method further comprises compensating the loaded weight of the weighing sensor according to the inclination angle, and eliminating the influence of the inclination angle on the measurement accuracy of the loaded weight.
According to the real-time monitoring device and method, the weighing sensor with multiple monitoring indexes is adopted for real-time monitoring, multiple safety designs are provided, the real-time state of the weighing sensor can be effectively monitored, an alarm is given in time, and the safety and reliability of the aerial work platform are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the principle of the invention. In the drawings:
FIG. 1 is a block diagram of a real-time monitoring device of a load cell of an aerial work platform according to an embodiment of the invention;
FIG. 2 is an exemplary flow chart of a method for real-time monitoring of aerial platform load cells in accordance with an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only examples or embodiments of the application, from which the application can also be applied to other similar scenarios without inventive effort for a person skilled in the art. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.
Flow charts are used herein to illustrate operations performed by systems according to embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, various steps may be processed in reverse order or simultaneously. Meanwhile, other operations are added to or removed from these processes.
Fig. 1 is a block diagram of a real-time monitoring device of a weighing sensor of an aerial work platform according to an embodiment of the invention. Referring to fig. 1, the real-time monitoring apparatus 100 of this embodiment includes a detection unit 110 and an alarm unit 120. The detection unit 110 detects real-time state parameters of the weighing sensor, and compares the real-time state parameters with a normal value range, wherein the real-time state parameters include one or more of an inclination angle, vibration, displacement, impact and a free fall state of the weighing sensor; when the real-time status parameter is not within the normal value range, the alarm unit 120 issues an alarm.
The present invention is not limited to the measuring device and the measuring method for the real-time status parameters, and those skilled in the art can obtain the real-time status parameters by using any measuring device and any measuring method. Preferably, the invention uses an accelerometer as the measuring device, the accelerometer being integrated in the circuit of the load cell.
In the above real-time status parameters, the tilt angle refers to the tilt angle of the retransmission sensor. Aerial work platform load cells typically have a flat platform. Normally, the weighing platform should be kept horizontal, and the weighing result of the weighing sensor is most accurate in the horizontal state. When the aerial work platform is inclined, measurement errors of the weighing sensors can be caused, and safety problems can be caused.
In a preferred embodiment, for example, a 3-axis acceleration of gravity is obtained using an accelerometer, and the tilt angle of the accelerometer, which includes a vertical angle and a horizontal angle, is calculated from the 3-axis acceleration of gravity, and is used to indicate the tilt angle of the load cell. When the weighing sensor of the aerial work platform is installed, a user can install the weighing sensor by referring to the inclination angle measured by the accelerometer, so that the installed weighing sensor is in the horizontal direction.
The invention is not limited to the specific type of accelerometer, and single-axis, double-axis, 3-axis, 6-axis and other accelerometers can be adopted. The preferred embodiment of the present invention will be described by taking a 3-axis accelerometer as an example.
In some embodiments, the real-time monitoring device further comprises an inclination angle compensation unit, which can compensate according to the weighing result of the inclination angle symmetrical weight sensor, and eliminate the influence of the inclination angle on the measurement precision of the loaded weight. In these embodiments, the measurement result is inaccurate because the inclination may cause the measurement accuracy of the load cell to decrease. Through experiments, the relation among the inclination angle, the loaded weight and the measurement result can be established, so that when the inclination occurs, the measurement result is directly compensated and corrected, and an accurate measurement result is obtained under the condition that the weighing sensor is inclined.
In some embodiments, the tilt angle compensation unit may include a 3-axis accelerometer and a 3-axis magnetometer, which may ensure accurate measurement of tilt angle.
In the above real-time status parameters, the vibration refers to the vibration of the retransmission sensor. When the aerial work platform travels, climbs or rises, violent vibration can occur, so that the weighing data of the weighing sensor is unstable, the problems of zero drift and the like occur, and the measurement precision is reduced.
In a preferred embodiment, an accelerometer is used to detect vibration, so that a vibration signal of 3-axis gravity acceleration can be obtained, whether the magnitude (amplitude or energy) of the vibration signal exceeds a set normal value range is judged, and if the magnitude (amplitude or energy) of the vibration signal exceeds the set normal value range, the alarm unit 120 gives an alarm.
In some embodiments, the vibrations are detected using a best-value detection. The most value detection means detecting a difference between a maximum value and a minimum value of the acceleration signal over a period of time, and calculating the difference Δ W using the following formula (1):
ΔW＝Wmax-Wmin (1)
wherein, WmaxRefers to the maximum value of the acceleration signal, W, over a period of timeminRefers to the minimum value of the acceleration signal over a period of time.
When Δ W exceeds a set normal value range, it is determined that the vibration is abnormal or excessive.
In some embodiments, variance detection is employed to detect vibrations. The variance detection means that the variance of each axis acceleration signal in a period of time is calculated, and if the variance exceeds a set normal value range, the vibration is judged to be abnormal or excessive.
In some embodiments, mean square detection is used to detect vibrations. The detection of the mean square value means to calculate the mean square value of the vibration acceleration signal over a period of time, for example, the mean square value is calculated by the following formula (2)
Wherein, XiRefers to one of the N acceleration signals.
When the mean square value
If the vibration is beyond the set normal value range, the vibration is judged to be abnormal or excessive.
In some embodiments, root mean square detection is employed to detect vibrations. The detection of the root mean square value refers to calculating the root mean square value of the vibration acceleration signal in a period of time, for example, calculating the root mean square value by using the following formula (3)
Wherein, XiOf N acceleration signalsOne.
When the root mean square value
If the vibration is beyond the set normal value range, the vibration is judged to be abnormal or excessive.
In some embodiments, mean square detection is employed to detect vibrations. The mean square detection means that the square of the mean of the vibration acceleration signal over a period of time is calculated, and is expressed by { E (x) } 2. The squared mean value represents the power of the dc component of the signal. And when the mean square value exceeds a set normal value range, judging that the vibration is abnormal or excessive.
In the above real-time status parameters, the displacement refers to the displacement of the retransmission sensor. In the use process of the aerial work platform, the stress point of the weighing sensor is displaced due to frequent vibration and shaking, and the bearing head of the weighing sensor is seriously abraded, so that the weighing data is inaccurate. In some embodiments, the load cell comprises a column sensor coupled to the platform such that when the aerial platform vibrates, the platform is displaced relative to the column sensor, and in severe cases the column sensor may break. Through the detection to the displacement, can discover weighing sensor's displacement state to avoid sensor fracture, weighing data consequence such as inaccurate.
In a preferred embodiment, an accelerometer is used to detect the displacement. The acceleration signal obtained by the accelerometer is integrated for the first time, so that the speed of 3 axes can be obtained; the displacement can be obtained by integrating the velocity once again, as shown in the following equations (4) to (6):
DX＝∫∫ax (4)
DY＝∫∫aY (5)
Dz＝∫∫aZ (6)
wherein, aX、aY、aZRespectively representing the acceleration signals of the 3 axes obtained by the 3-axis accelerometer, DX、DY、DZIs 3 axial positionsAnd (6) moving.
The alarm unit 120 issues an alarm when any one of the displacements is out of its normal value range.
In some embodiments, the real-time monitoring device of the present invention records the number of times the displacement exceeds a normal range of values, the historical maximum displacement, and the time at which it occurred. When the number of times exceeds a set normal value range, the alarm unit 120 issues an alarm.
In the real-time state parameters, the impact weighing weight sensor bears excessive load instantly, which causes zero drift of the weighing sensor, changes of metering performances such as sensitivity, linearity, hysteresis, creep and the like, which leads to inaccurate weighing, and seriously leads to breakage or deformation of the sensor, thus affecting the service life of the weighing sensor.
In a preferred embodiment, an accelerometer is used for shock detection. When impact occurs, the accelerometer can give an interrupt signal, and the weighing result of the weighing sensor, the time when the impact occurs and the number of times of the impact occur are recorded. When the weighing result exceeds the set normal value range, the alarm unit 120 issues an alarm. Alternatively, the alarm unit 120 issues an alarm when the number of times of occurrence of the impact exceeds a set normal value range.
In the real-time status parameters, the free-fall status indicates that the motion sensor has a free-fall motion. For example, in the transportation process or during installation, the weighing sensor falls from a certain height due to accidents, so that the performances of zero point, sensitivity and the like of the weighing sensor are changed, and even the weighing sensor cannot be used.
In a preferred embodiment, an accelerometer is used to detect a free fall condition. When the weighing sensor provided with the accelerometer performs free-fall movement, the amplitude of the acceleration signal of the 3 axes of the accelerometer is very small, namely about 0. And when the acceleration signal is smaller than a set threshold value, judging that the free falling body movement occurs, and recording the time and the occurrence frequency of the free falling body movement. In some embodiments, the alarm unit 120 issues an alarm upon detecting the occurrence of a free fall movement.
These real-time condition parameters are all related to the performance of the load cell, and each has its normal range of values. By detecting the real-time status parameters, when at least one of the parameters is not within the corresponding normal value range, the status is abnormal, and the alarm unit 120 sends out an alarm, so that the user can know the status of the weighing sensor in time and take corresponding treatment measures.
In some embodiments, the real-time condition parameters detected by the real-time monitoring device of the present invention further include a natural frequency of the load cell, the natural frequency being related to a loaded weight of the load cell.
Under normal use conditions, the mechanical natural frequency of the load cell is stabilized within a certain range, and if the natural frequency is beyond a normal value range, the natural frequency indicates that the performance of the load cell may be changed or affected, such as cracks and the like.
In a normal state, a correspondence list between the natural frequency of the load cell and the loaded weight of the load cell can be obtained by actual measurement.
In a preferred embodiment, an accelerometer is used to detect the natural frequency of the load cell. The frequency of the output signal of 3 axes can be detected in real time by the accelerometer. When the object is loaded on the weighing sensor, the weighing result and the frequency of the output signal are recorded, the corresponding list is compared, and the natural frequency range corresponding to the weighing result is found according to a table look-up method. If the frequency of the output signal exceeds the natural frequency range, which indicates that the weighing sensor is abnormal, the alarm unit 120 gives an alarm.
In some embodiments, the real-time monitoring device of the present invention detects the natural frequency only when the load cell is in a steady state. When the aerial work platform is in the processes of ascending, descending and the like, the weighing sensor is in a motion state, and the natural frequency does not need to be detected. Only when the aerial work platform is in a static state, the weighing sensor is in a stable state, the natural frequency is detected, and the interference of dynamic factors is avoided.
In some embodiments, the real-time monitoring device further includes a filtering unit for filtering the loaded weight signal of the sensor, and the filtering characteristic parameters of the filtering unit are adjusted according to the vibration frequency to eliminate the influence of vibration on the measurement accuracy of the loaded weight and the natural frequency.
The detection circuit of a general weighing sensor comprises a filtering unit which is responsible for processing a loaded weight signal obtained by a symmetrical weighing sensor so as to filter out environmental noise. The real-time monitoring device of the invention adopts the acceleration transducer to detect the vibration frequency of the weighing sensor, can adjust the filter characteristic parameters of the original filter unit according to the vibration frequency, filters unnecessary vibration signals from the loaded weight signals, and is equivalent to form a self-adaptive filter system, thereby still obtaining stable loaded weight signals in a vibration state and obtaining accurate weighing results.
In some embodiments, the filtering unit is also used in the detection of the natural frequency of the symmetric retransmission sensor. By adopting the loaded weight signal processed by the filtering unit, the interference of vibration to the natural frequency can be filtered, so that more accurate natural frequency can be obtained.
In a preferred embodiment, accelerometer measurements are used to obtain accelerometer signals for each axis from which the magnitude of the vibration frequency is obtained. The method of frequency detection may include a fast fourier transform fft method, for example, using the following equations (7) to (9):
Fx＝fft(X) (7)
FY＝fft(Y) (8)
Fz＝fft(Z) (9)
wherein X, Y, Z are the accelerometer signals for the 3 axes, respectively, FX、FY、FZRespectively, are the vibration frequency signals obtained after FFT.
In some embodiments, the vibration frequency signal may also be obtained using zero-crossing detection. For example, the following formulas (10) to (12) are employed:
wherein X in the formula (10)iIs one of N sampling signals in the accelerometer signal, and the average value of a piece of data (data of N +1 sampling points) can be obtained according to the formula (10)
The average value is taken as the reference zero.
Counting the over-reference zero point in all the sampling signals according to the formula (11)
The number of sampling points is counted according to the formula (12), and the number of sampling points in all the sampling signals is less than or equal to the reference zero point
And obtaining the vibration frequency of the accelerometer signal.
Compared with the FFT method, the zero-crossing detection method has the advantages that the calculated amount is small, the expenditure can be saved, and the efficiency is improved.
According to the real-time monitoring device, the weighing sensors with various monitoring indexes are adopted for real-time monitoring, multiple safety designs are provided, the real-time state of the weighing sensors can be effectively monitored, an alarm can be given out in time, and the safety and the reliability of the aerial work platform are improved.
FIG. 2 is an exemplary flow chart of a method for real-time monitoring of aerial platform load cells in accordance with an embodiment of the present invention. The real-time monitoring method of the present invention can be performed by the real-time monitoring device described above, and therefore, fig. 1 and the description of the foregoing can be used to describe the real-time monitoring method of the present invention, and repeated descriptions will not be repeated. Of course, other devices may be employed to perform the real-time monitoring method of the present invention.
Referring to fig. 2, the real-time monitoring method of this embodiment includes the following steps:
step S210: detecting real-time state parameters of the weighing sensor, and comparing the real-time state parameters with a normal value range, wherein the real-time state parameters comprise one or more of an inclination angle, vibration, displacement, impact and free-fall state of the weighing sensor; and
step S220: and when the real-time state parameter is not in the normal value range, an alarm is given.
In some embodiments, the real-time status parameters further include a natural frequency of the load cell, the natural frequency being related to a loaded weight of the load cell.
In some embodiments, the natural frequency is detected while the load cell is in a steady state.
In some embodiments, detecting a vibration frequency of the load cell is also included.
In some embodiments, the method further comprises filtering the loaded weight signal of the weighing sensor according to the vibration frequency, so as to eliminate the influence of vibration on the measurement accuracy of the loaded weight and the natural frequency.
In some embodiments, the method further comprises the step of compensating the loaded weight of the sensor according to the inclination angle, so that the influence of the inclination angle on the measurement accuracy of the loaded weight is eliminated.
Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing disclosure is by way of example only, and is not intended to limit the present application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.
Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.
Similarly, it should be noted that in the preceding description of embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.
Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.
Claims (13)
1. The utility model provides an aerial working platform weighing sensor's real-time supervision device which characterized in that includes:
the detection unit is used for detecting real-time state parameters of the weighing sensor and comparing the real-time state parameters with a normal value range, wherein the real-time state parameters comprise one or more of an inclination angle, vibration, displacement, impact and free falling state of the weighing sensor; and
and the alarm unit gives an alarm when the real-time state parameters are not in the normal value range.
2. The real-time monitoring device of claim 1, wherein the real-time status parameter is detected using an accelerometer.
3. The real-time monitoring device of claim 1, wherein the real-time status parameter further comprises a natural frequency of the load cell, the natural frequency being related to a loaded weight of the load cell.
4. The real-time monitoring device of claim 3, wherein the detection unit detects the natural frequency when the load cell is in a steady state.
5. The real-time monitoring device of claim 3, wherein the detection unit comprises an acceleration sensor that detects a vibration frequency of the load cell.
6. The real-time monitoring device of claim 5, further comprising a filtering unit for filtering a loaded weight signal of the weighing sensor, wherein a filtering characteristic parameter of the filtering unit is adjusted according to the vibration frequency, so that the influence of the vibration on the measurement accuracy of the loaded weight and the natural frequency is eliminated.
7. The real-time monitoring device according to claim 3, further comprising an inclination angle compensation unit for compensating the weighing result of the weighing sensor according to the inclination angle, so as to eliminate the influence of the inclination angle on the measurement accuracy of the loaded weight.
8. A real-time monitoring method for a weighing sensor of an aerial work platform is characterized by comprising the following steps:
detecting real-time state parameters of the weighing sensor, and comparing the real-time state parameters with a normal value range, wherein the real-time state parameters comprise one or more of an inclination angle, vibration, displacement, impact and a free-fall state of the weighing sensor; and
and when the real-time state parameter is not in the normal value range, an alarm is given.
9. The real-time monitoring method of claim 8, wherein the real-time status parameters further include a natural frequency of the load cell, the natural frequency being related to a loaded weight of the load cell.
10. The real-time monitoring method of claim 9, wherein the natural frequency is detected while the load cell is in a steady state.
11. The real-time monitoring method of claim 9, further comprising detecting a vibration frequency of the load cell.
12. The real-time monitoring method of claim 11, further comprising filtering a loaded weight signal of the load cell according to the vibration frequency to remove measurement accuracy effects of the vibration on the loaded weight and the natural frequency.
13. The real-time monitoring method according to claim 9, further comprising compensating the loaded weight of the load cell according to the inclination angle, and eliminating the influence of the inclination angle on the measurement accuracy of the loaded weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110321818.3A CN113074801A (en) | 2021-03-25 | 2021-03-25 | Real-time monitoring device and method for weighing sensor of aerial work platform |
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| CN113551759A (en) * | 2021-07-22 | 2021-10-26 | 合肥金果缘视觉科技有限公司 | Fruit weighing error control method |
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