A three-dimensional garage chain detection system based on fiber Bragg grating

Abstract

The present invention discloses a chain detection system for a three-dimensional garage based on fiber Bragg gratings, which includes chains arranged around the car-carrying board. Fiber Bragg grating sensors are evenly distributed on one side of the chains. A fiber optic temperature sensor is also provided on the chains or the car-carrying board. The fiber Bragg grating sensors and the fiber optic temperature sensor are connected to a fiber Bragg grating demodulator through lead-out optical fibers, and the fiber Bragg grating demodulator is connected to a remote monitoring center. By adopting the above-mentioned chain detection system for a three-dimensional garage based on fiber Bragg gratings, the present invention has a simple structure, small occupied volume, and accurate measurement. It can real-time detect and monitor fiber Bragg grating type stress and strain sensors and corresponding fixed fitting devices, and can real-time sense the strain caused by the force on the chains when the parking spaces of the three-dimensional garage are in use, preventing the occurrence of chain loosening. At the same time, the balance of the car-carrying board can be detected according to the force change of the chains on the same car-carrying board.

Description

Technical Field

[0001] The present invention relates to the technical field of three-dimensional garages, and in particular to a chain detection system for a three-dimensional garage based on fiber Bragg gratings. Background Art

[0002] Three-dimensional garages can save space and effectively solve the problem of tight urban parking spaces, and have been widely used at present. Among them, the lifting and traversing type garages are the most widely used, and the lifting transmission devices mostly adopt chain structures. However, there are many chain failure problems in three-dimensional garages, and the safety is low. When in use, the situation of the chain getting stuck or loosening often occurs and is difficult to detect in advance, which poses a certain safety hazard. If the lifting and traversing mechanism is still used in the case of a loose chain, it may cause the car carrier board to tilt or fall, damaging people's personal and property safety. Therefore, it is crucial to ensure that the transmission chain is in a tense state and avoid slackness.

[0003] Most of the existing chain detections use loose chain detection devices, the structure of which includes a swing arm and a pressing member, which can detect whether the chain is loose and can perform secondary detection to ensure the accuracy of the results. However, the traditional loose chain detection device occupies a large volume, and the method of preventing false alarms by checking one by one is time-consuming, and it cannot perform real-time detection and monitoring on the chain. For the loose chain switch, although it is small in volume during the detection of the three-dimensional garage chain and can give real-time alarms; the disadvantage is that it is not convenient to network when there are a large number of loose chain switches, and it cannot detect the problem of the car carrier board tilting caused by the uneven movement and different movement speeds at both ends of the garage chain.

[0004] Fiber optic sensing technology has gradually matured and has obvious advantages in measurement accuracy, safety and anti-interference ability. As a rapidly developing optical passive device, fiber Bragg gratings have been widely used in the measurement of temperature and stress and strain. Its detection principle is mainly to obtain sensing information by modulating the fiber Bragg wavelength by certain specific external environments or physical factors (such as temperature, stress and strain). Using fiber Bragg gratings to detect the strain of the load-bearing chain during loosening and stress has high precision and saves labor costs. Compared with the traditional chain detection method, it has the advantages of small occupied space, real-time detection and monitoring, immunity to electromagnetic signal interference, strong reliability and convenient networking. Summary of the Invention

[0005] The purpose of the present invention is to provide a chain detection system for a three-dimensional garage based on fiber Bragg gratings, which has a simple structure, small occupied volume, accurate measurement, a fiber Bragg grating type stress and strain sensor that can perform real-time detection and monitoring, a corresponding fixed fitting device, can perceive the strain caused by the force on the chain during the use of the three-dimensional garage parking space in real time, prevent the chain from loosening, and at the same time, can detect the balance of the car carrier board according to the force change of the chain on the same car carrier board.

[0006] To achieve the above object, the present invention provides a three-dimensional garage chain detection system based on fiber Bragg grating, which includes chains arranged around the car-carrying board. Fiber Bragg grating sensors are evenly distributed on one side of each chain, and a fiber optic temperature sensor is also provided on the chain or the car-carrying board. The fiber Bragg grating sensors and the fiber optic temperature sensor are connected to a fiber Bragg grating demodulator through lead-out optical fibers, and the fiber Bragg grating demodulator is connected to a remote monitoring center.

[0007] Preferably, the chain includes outer chain links and inner chain links that are sequentially arranged and connected by rollers. The fiber Bragg grating sensors include soft support plates evenly distributed on one side of the chain. A fiber Bragg grating sensing unit is provided inside the support plate. An upper clamping plate inserted between the rollers is provided above the support plate, and a lower clamping plate inserted between the rollers is provided below it.

[0008] Preferably, the end of the upper clamping plate slopes downward, and the lower clamping plate is a horizontal structure.

[0009] Preferably, the upper clamping plate and the lower clamping plate are connected to the support plate through a connecting shaft.

[0010] Preferably, middle clamping plates connected by elastic bands are provided on both sides of the support plate. The middle clamping plates correspond to the positions of the outer chain links, and their ends are provided with smooth structures bent inward.

[0011] Preferably, a fitting device connected to the support plate is provided between the support plate and the elastic band.

[0012] Preferably, a communication optical cable connected to the lead-out optical fiber is provided on one side of the car-carrying board.

[0013] Preferably, the material of the support plate is an elastic material, and an adiabatic material is also coated on the outside of the fiber Bragg grating sensor.

[0014] Therefore, the present invention adopts the above three-dimensional garage chain detection system based on fiber Bragg grating, which has a simple structure, can be monitored in real time, and is convenient and accurate to measure. The detection system of the present invention is connected to both ends of the support plate through both ends of the upper clamping plate and the lower clamping plate, and can extend a certain distance when subjected to tension. The fitting devices on both sides of the support plate closely fit the fiber Bragg grating sensor and the chain to be measured, ensuring that the stress condition of the chain is reflected on the fiber Bragg grating sensor. The fiber Bragg grating sensor transmits the reflected light wavelength signal to the fiber Bragg grating demodulator through the lead-out optical fiber.

[0015] Meanwhile, place an accurately temperature-measuring fiber optic temperature sensor in the environment to be measured (the stereo garage), which can eliminate the influence of the garage environment temperature on the reflection wavelength, so as to accurately obtain the change in the central wavelength caused by strain. The fiber Bragg grating demodulator analyzes the fiber optic wavelength signal and correlates it with the strain condition of the chain to achieve the measurement of the strain of the drive chain. The fiber Bragg grating demodulator transmits each parameter value to the remote monitoring center in real time, and then completes the storage, analysis, and visual display of the data through the structural health analysis software of the remote monitoring center.

[0016] The following further describes the technical solution of the present invention in detail through the accompanying drawings and embodiments. Description of the Drawings

[0017] Figure 1 is a schematic diagram of the application scenario of a stereo garage chain detection system based on fiber Bragg grating;

[0018] Figure 2 is a schematic structural diagram of a support plate in a stereo garage chain detection system based on fiber Bragg grating;

[0019] Figure 3 is a front view of a chain in a stereo garage chain detection system based on fiber Bragg grating;

[0020] Figure 4 is a side view of a chain in a stereo garage chain detection system based on fiber Bragg grating;

[0021] Figure 5 is a schematic diagram of a fitting device in a stereo garage chain detection system based on fiber Bragg grating;

[0022] Figure 6 is a module diagram of a stereo garage chain detection system based on fiber Bragg grating.

[0023] Reference Signs

[0024] 1. Fiber Bragg grating sensor; 1-1. Upper clamping plate; 1-2. Lower clamping plate; 1-3. Fitting device; 1-4. Elastic band; 1-5. Middle clamping plate; 1-6. Fiber Bragg grating sensing unit; 1-7. Support plate; 1-8. Lead-out optical fiber;

[0025] 2. Chain; 2-1. Roller; 2-2. Outer link; 2-3. Inner link;

[0026] 3. Communication optical cable; 4. Carriage plate. Detailed Embodiment

[0027] The following further illustrates the technical solution of the present invention through the accompanying drawings and embodiments.

[0028] Unless otherwise defined, technical terms or scientific terms used in this invention shall have the ordinary meanings as understood by those of ordinary skill in the art to which this invention pertains.

[0029] For those skilled in the art, it is obvious that this invention is not limited to the details of the above-described exemplary embodiments, and without departing from the gist or basic characteristics of this invention, this invention can be implemented in other specific forms. Therefore, from any perspective, the embodiments should be regarded as exemplary and non-restrictive. The scope of this invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within this invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0030] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments understandable by those skilled in the art. These other embodiments are also covered by the protection scope of this invention.

[0031] It should also be understood that the above-described specific embodiments are only used to explain this invention, and the protection scope of this invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by this invention, according to the technical solution and inventive concept of this invention, makes equivalent substitutions or changes, and all should be covered by the protection scope of this invention.

[0032] The terms "including" or "comprising" and the like used in this invention mean that the elements before this word cover the elements listed after this word, and do not exclude the possibility of also covering other elements. The orientation or positional relationship indicated by terms such as "inside", "outside", "above", "below", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to this invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. In this invention, unless otherwise clearly defined and limited, terms such as "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this invention can be understood according to specific situations.

[0033] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary should be understood to have a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such herein.

[0034] Technologies, methods, and devices known to those of ordinary skill in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0035] The content disclosed in the prior art documents cited in the specification of the present invention is incorporated into the present invention by reference in its entirety, and thus is part of the disclosure content of the present invention.

[0036] Embodiment 1

[0037] A three-dimensional garage chain detection system based on fiber Bragg grating includes chains 2 arranged around the vehicle-carrying board 4. Fiber Bragg grating sensors 1 are evenly distributed on one side of the chains. The fiber Bragg grating sensors are connected to a fiber Bragg grating demodulator through lead-out optical fibers, and the fiber Bragg grating demodulator is connected to a remote monitoring center. A communication optical cable 3 connected to the lead-out optical fiber 1-8 is provided on one side of the vehicle-carrying board to stably transmit the data collected by the fiber Bragg grating sensors to the remote monitoring center.

[0038] The chain includes outer chain links 2-2 and inner chain links 2-3 that are sequentially arranged and connected by rollers 2-1. The fiber Bragg grating sensors include soft support plates 1-7 evenly distributed on one side of the chain. A fiber Bragg grating sensing unit 1-6 is provided inside the support plate. The material of the support plate is an elastic material to ensure that the fiber Bragg grating sensing unit effectively collects the data information of the chain.

[0039] An upper clamping plate 1-1 inserted between the rollers is provided above the support plate, and a lower clamping plate 1-2 inserted between the rollers is provided below it. The end of the upper clamping plate slopes downward, and the lower clamping plate is a horizontal structure. The stable connection of the support plate is realized through the upper clamping plate and the lower clamping plate. The upper clamping plate and the lower clamping plate are connected to the support plate through a connecting shaft to realize the adjustment of the angle during the change of the support plate.

[0040] Middle clamping plates 1-5 connected by elastic bands 1-4 are provided on both sides of the support plate to realize the position change of the middle clamping plates through the elastic bands. The position of the middle clamping plate corresponds to that of the outer chain link, and its end is provided with a smooth structure bent inward to ensure the stable connection between the middle clamping plate and the outer chain link. A fitting device 1-3 connected to the support plate is provided between the support plate and the elastic band. The fitting device ensures the stable connection between the support plate and the chain while ensuring that the support plate accurately reflects the stress of the chain.

[0041] When the detection system of the present invention is in use, first, the upper clamping plates and the lower clamping plates at both ends of the support plate are fixed on the rollers, and then the middle of the support plate is fixed through the middle clamping plate to prevent the fiber grating sensor from sliding during measurement and affecting the accuracy of the detection result. At this time, the chain between the upper clamping plate and the lower clamping plate is the detection target. During detection, there is no need to remove the chain, and it can be directly fixed on the chain to realize the functions of real-time detection and monitoring of the lifting and horizontal garage chain.

[0042] Moreover, both sides of the support plate are clamped with the outer link of the chain through the fitting device. The cross-section of the middle clamping plate is triangular, and the outer link of the chain is stably clamped in the middle, realizing the close fitting of the fiber grating sensor on the surface of the chain, reducing the fiber strain changes caused by other irrelevant factors (the fiber is not tightly fitted with the chain, and the fiber plastic plate is extruded and bulged), and further improving the accuracy of the detection result.

[0043] When the chain slides, deforms or is stretched under force, the generated stress can be transmitted to the fiber Bragg grating sensing unit through the elastic material of the support plate. The fiber grating sensor then transmits the signal through the lead-out optical fiber to the fiber grating demodulator. Through signal analysis and processing, the strain condition of the chain detection device is obtained, and further the length of the three-dimensional garage chain is obtained to judge whether there are phenomena such as chain loosening, and potential safety hazards are eliminated in a timely manner.

[0044] Embodiment 2

[0045] The outside of the fiber Bragg grating sensing unit is wrapped with special heat-insulating material to prevent the optical fiber from being affected by heat and causing inaccurate measurement results. For the change of ambient temperature, an optical fiber temperature sensor is also provided on the chain or the car carrier plate to realize the acquisition of temperature data. The "space division multiplexing combined with wavelength division multiplexing" scheme is adopted, and the sensing network needs to be set according to the monitoring key points of the parking space transmission structure.

[0046] The fiber Bragg grating sensing unit is connected to the fiber grating demodulator through the lead-out optical fiber. By analyzing and deducting the influence of temperature on the reflection wavelength, an accurate strain value can be obtained. Finally, the chain stress strain value is corresponded to the chain detection standard to judge whether there may be a loosening situation and eliminate the risk.

[0047] Specifically, the fiber Bragg grating sensing unit mainly dynamically monitors the strain changes of the vertical and horizontal chains, and the fiber optic temperature sensor mainly dynamically monitors the ambient temperature changes. The signals of the fiber Bragg grating sensing units are backpropagated and then transmitted to the multi-channel dynamic fiber grating demodulation system through the communication optical cable, which demodulates the wavelength drift of each fiber Bragg grating sensing unit in real time and calculates the corresponding external parameter values. The external parameter values of each fiber Bragg grating sensing unit demodulated by the multi-channel dynamic fiber grating demodulation system are transmitted to the structural health analysis software of the remote garage operation and maintenance monitoring center in real time through the computer Ethernet to complete the storage, analysis, and visual display of the data.

[0048] Embodiment 3

[0049] Consider the case where the car carrier tilts. The car carrier tilts due to unbalanced chain movement or different movement speeds. Fiber optic grating sensors same as those in Embodiment 1 are respectively installed on the chains connecting the car carrier, and the fiber optic detection sensors are grouped. The devices for detecting the same car carrier are in one group. By comparing the return values of the four fiber Bragg grating sensing units in the same group, the force conditions of each chain are analyzed to determine whether there is a tilting problem with the car carrier. A detection threshold is set. If the sensor signal changes beyond the threshold, it indicates that the car carrier is tilted.

[0050] Therefore, the present invention adopts the above-mentioned fiber grating-based three-dimensional garage chain detection system, which has a simple structure, small occupied volume, and accurate measurement. The fiber grating type stress-strain sensor and the corresponding fixed fitting device that can be detected and monitored in real time can sense the strain caused by the force on the chain during the use of the three-dimensional garage parking space in real time, prevent the chain from loosening, and at the same time, can detect the balance of the car carrier according to the force change of the chains of the same car carrier.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A three-dimensional garage chain detection system based on fiber Bragg grating, characterized in that: It includes chains arranged around the car-carrying board. Fiber Bragg grating sensors are evenly distributed on one side of each chain. A fiber optic temperature sensor is also provided on the chain or the car-carrying board. The fiber Bragg grating sensors and the fiber optic temperature sensor are connected to a fiber Bragg grating demodulator through lead-out optical fibers, and the fiber Bragg grating demodulator is connected to a remote monitoring center; The chain includes outer link sections and inner link sections that are sequentially arranged and connected by rollers. The fiber Bragg grating sensors include soft support plates evenly distributed on one side of the chain. A fiber Bragg grating sensing unit is provided inside the support plate. An upper clamping plate inserted between the rollers is provided above the support plate, and a lower clamping plate inserted between the rollers is provided below it; The end of the upper clamping plate slopes downward, and the lower clamping plate is a horizontal structure; Middle clamping plates connected by elastic bands are provided on both sides of the support plate. The middle clamping plates correspond to the positions of the outer link sections, and their ends are provided with smooth structures bent inward; A fitting device connected to the support plate is provided between the support plate and the elastic band; The chain between the upper clamping plate and the lower clamping plate is the detection target. During detection, there is no need to remove the chain, and it can be directly fixed on the chain, realizing the function of real-time detection and monitoring of the lifting and horizontal garage chain; Both sides of the support plate are clamped to the outer link section of the chain through the fitting device. The cross-section of the middle clamping plate is triangular, and the outer link section of the chain is stably clamped in the middle, realizing that the fiber Bragg grating sensor is closely attached to the surface of the chain.

2. The three-dimensional garage chain detection system based on fiber Bragg grating according to claim 1, characterized in that: The upper clamping plate and the lower clamping plate are connected to the support plate through a connecting shaft.

3. The three-dimensional garage chain detection system based on fiber Bragg grating according to claim 1, characterized in that: A communication optical cable connected to the lead-out optical fiber is provided on one side of the car-carrying board.

4. A three-dimensional garage chain detection system based on fiber Bragg grating according to claim 1, characterized in that: The material of the support plate is an elastic material, and an adiabatic material is also coated on the outside of the fiber Bragg grating sensor.

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