Monitoring device and monitoring method for cycle life of bellow expansion joint

Abstract

The invention discloses a monitoring device and monitoring method for the cycle life of a bellow expansion joint, and the monitoring device comprises a stress sensor which is suitable for being connected with the expansion joint and is used for detecting the stress of the expansion joint; the electronic counter is electrically connected with the stress sensor and is configured to record the number of times that the stress of the expansion joint exceeds the preset pressure; and the display is electrically connected with the stress sensor and the electronic counter and is used for displaying the residual life, the stress and / or the maximum stress of the expansion joint. According to the monitoring device for the cycle life of the bellow expansion joint, the stress sensor, the electronic counter and the display are arranged, so that the cycle life of the bellow expansion joint can be counted, and whether the bellow expansion joint serves under an over-design working condition or not can be detected; and a user unit can carry out replacement work in a targeted manner according to the residual cycle life, so that accidents caused by expiration of the fatigue life can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure pipelines, and in particular to a monitoring device and a monitoring method for the cyclic life of a corrugated expansion joint. Background Art

[0002] With the thermal power units entering flexible operation (such as frequent start-stop, low-load operation, rapid peak regulation, etc.), the cyclic times of the extraction pipeline expansion joints increase significantly, resulting in a sharp reduction in their service time. Since the inspection of the expansion joints needs to be combined with the maintenance cycle, it is impossible to judge whether the appearance state needs to be replaced before the cyclic life reaches. However, when the cyclic life reaches, there may be failures caused by fatigue. If the unit is still running at this time, the safety will be seriously affected.

[0003] The existing detection methods for corrugated expansion joints mostly adopt visual inspection combined with penetrant inspection. Such detection methods are for components with cracks on the surface. When the fatigue life has not been exhausted, there are no cracks on the surface of the expansion joint, but its life cannot support until the next maintenance period. If such problems are not replaced in time, it may lead to leakage of the expansion joint, resulting in shutdown or even personal injury accidents. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. For this reason, the present invention provides a monitoring device for the cyclic life of a corrugated expansion joint. The monitoring device can count the cyclic life of the corrugated expansion joint and detect whether it operates under over-designed conditions, so that the user unit can carry out replacement work targeted according to its remaining cyclic life, thereby avoiding accidents caused by the expiration of the fatigue life.

[0005] The present invention also provides a monitoring method.

[0006] The monitoring device for the cyclic life of a corrugated expansion joint according to the present invention includes: a stress sensor adapted to be connected to the expansion joint for detecting the stress of the expansion joint; an electronic counter electrically connected to the stress sensor and configured to record the number of times the stress of the expansion joint exceeds a preset pressure; and a display electrically connected to the stress sensor and the electronic counter for displaying the remaining life, the stress and / or the maximum stress of the expansion joint.

[0007] The monitoring device for the cyclic life of a corrugated expansion joint according to the present invention can count the cyclic life of the corrugated expansion joint and detect whether it operates under over-designed conditions by setting a stress sensor, an electronic counter and a display, so that the user unit can carry out replacement work targeted according to its remaining cyclic life, thereby avoiding accidents caused by the expiration of the fatigue life.

[0008] According to some embodiments of the present invention, the stress sensor is configured to detect the displacement of the expansion joint, the electronic counter is configured to record the number of times the displacement exceeds a preset displacement, and the display is adapted to display the displacement and / or the maximum displacement.

[0009] According to some embodiments of the present invention, the monitoring device further includes: an alarm device, the alarm device is electrically connected to the stress sensor, and the alarm device is adapted to emit an alarm signal when the stress of the expansion joint exceeds a preset pressure and / or the displacement exceeds a preset displacement.

[0010] According to some embodiments of the present invention, the alarm device is integrated with the display.

[0011] According to some embodiments of the present invention, the alarm signal is a sound alarm signal and / or a light alarm signal.

[0012] According to some embodiments of the present invention, the monitoring device further includes: a fixing bracket, both ends of the fixing bracket are respectively adapted to be fixedly connected to both ends of the expansion joint, and the stress sensor, the electronic counter and the display are fixed on the fixing bracket.

[0013] According to some embodiments of the present invention, the fixing bracket is welded to the expansion joint.

[0014] According to the monitoring method of the second aspect of the present invention, the monitoring method is used for the monitoring device of the cyclic life of the corrugated expansion joint according to the first aspect of the present invention, and the monitoring method includes: the stress sensor detects the real-time operation parameters of the expansion joint; when the real-time operation parameters are greater than the preset parameters, the electronic counter counts; according to the count value of the electronic counter, calculate the remaining life of the expansion joint; the display displays the remaining life and the real-time operation parameters.

[0015] According to the monitoring method of the present invention, by displaying the remaining life through the display, the remaining life of the expansion joint can be more intuitively understood, so that the staff can carry out replacement work targeted according to its remaining cyclic life, avoiding the occurrence of material damage and personal injury incidents.

[0016] According to some embodiments of the present invention, the real-time operation parameters include stress parameters and / or displacement parameters.

[0017] According to some embodiments of the present invention, the monitoring method further includes: when the real-time operation parameters are greater than the preset parameters, the alarm device issues an alarm message.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0019] Figure 1 is a schematic connection diagram of a monitoring device and an expansion joint according to an embodiment of the present invention; Figure 2 is a schematic diagram of a monitoring device according to an embodiment of the present invention.

[0020] Reference Signs: 100, monitoring device; 10, stress sensor; 20, electronic counter; 30, display; 40, fixed bracket; 200, expansion joint. Detailed Embodiment

[0021] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0022] Reference is made below Figure 1 - Figure 2 to describe a monitoring device 100 for the cyclic life of a corrugated expansion joint according to an embodiment of the present invention.

[0023] As Figure 1 - Figure 2 shown, a monitoring device 100 for the cyclic life of a corrugated expansion joint according to an embodiment of the present invention includes: a stress sensor 10, an electronic counter 20, and a display 30. The stress sensor 10 is adapted to be connected to the expansion joint 200 and is used to detect the stress of the expansion joint 200. Specifically, the stress sensor 10 is an instrument that calculates stress by measuring the elastic deformation of an object. Among them, the stress sensor 10 has a simple structure, small volume, light weight, high reliability, and is not easily affected by environmental factors. Therefore, by using the stress sensor 10 to detect the stress of the expansion joint 200 in this device, the detection accuracy of the stress can be improved, and at the same time, the production cost of the entire monitoring device 100 can be reduced.

[0024] The electronic counter 20 is electrically connected to the stress sensor 10 and is configured to record the number of times the stress of the expansion joint 200 exceeds a preset pressure.

[0025] It should be noted that the preset pressure is the pressure threshold set for the expansion joint 200 according to the design data, and the number of times the stress of the expansion joint 200 exceeds the preset pressure is the number of cycles of the expansion joint 200. Therefore, the electronic counter 20 can be used to record the number of cycles of the expansion joint 200.

[0026] The display 30 is electrically connected to the stress sensor 10 and the electronic counter 20, and is used to display the remaining life, stress, and / or maximum stress of the expansion joint 200.

[0027] Specifically, the remaining life of the expansion joint 200 refers to the expected time or number of cycles during which it can continue to work safely and effectively under its current operating conditions. Thus, by displaying the remaining life of the expansion joint 200 on the display 30, the staff can more intuitively understand the remaining life of the expansion joint 200, and can carry out replacement work targeted according to its remaining cycle life, avoiding accidents caused by the expiration of the fatigue life.

[0028] In addition, the display 30 can also be used to display the real-time stress or the maximum stress, or can display the real-time stress and the maximum stress simultaneously. In this way, personnel can more intuitively judge whether the expansion joint 200 is operating under conditions exceeding the design conditions.

[0029] It should be noted that the remaining life is generally calculated by the difference between the designed preset remaining life and the number of cycles of the expansion joint 200.

[0030] According to the monitoring device 100 for the cyclic life of the corrugated expansion joint of the embodiment of the present invention, by setting the stress sensor 10, the electronic counter 20, and the display 30, the cyclic life counting of the corrugated expansion joint 200 can be realized and whether it is operating under conditions exceeding the design conditions can be detected, so that the user unit can carry out replacement work targeted according to its remaining cycle life, thereby avoiding accidents caused by the expiration of the fatigue life.

[0031] According to some embodiments of the present invention, the stress sensor 10 is configured to detect the displacement of the expansion joint 200, the electronic counter 20 is configured to record the number of times the displacement exceeds the preset displacement, and the display 30 is adapted to display the displacement and / or the maximum displacement. Among them, the number of times the displacement exceeds the preset displacement is the number of cycles of the expansion joint 200. Thus, the electronic counter 20 records the number of cycles of the expansion joint 200. In this way, the staff can monitor the number of cycles of the expansion joint 200 in real time, and then can formulate a more scientific and reasonable preventive maintenance plan according to the number of cycles, avoiding safety accidents or production interruptions caused by the sudden failure of the expansion joint 200.

[0032] "The display 30 is adapted to display the displacement and / or the maximum displacement" can be understood as that the display 30 can display the real-time displacement, can also only display the maximum displacement, or can display the real-time displacement and the maximum displacement. In this way, personnel can more intuitively judge whether the expansion joint 200 is damaged, thereby improving the monitoring efficiency.

[0033] It should be noted that the displacement in this embodiment is the tensile or compressive amount of the expansion joint 200; the preset displacement is the displacement threshold set for the expansion joint 200 according to the design data, that is, the maximum compressive or tensile amount that the expansion joint 200 can withstand compression or tension without failure.

[0034] Optionally, the display 30 can limit the number of cycles of the expansion joint 200. In this way, the number of cycles of the expansion joint 200 can be more intuitively displayed, thereby improving the monitoring efficiency.

[0035] According to some embodiments of the present invention, the monitoring device 100 further includes: an alarm device, which is electrically connected to the stress sensor 10, and the alarm device is adapted to emit an alarm signal when the stress of the expansion joint 200 exceeds the preset pressure and / or the displacement exceeds the preset displacement. In this way, the staff can timely discover the abnormal state of the expansion joint 200 during operation, and can thus respond and process in a timely manner, thereby reducing other problems caused by the abnormality of the expansion joint 200.

[0036] It can be understood that in this embodiment, the alarm device can be set to emit an alarm signal when the stress of the expansion joint 200 exceeds the preset pressure, or the alarm device can be set to emit an alarm signal when the displacement of the expansion joint 200 exceeds the preset displacement, or the alarm device can be set to emit an alarm signal when the stress of the expansion joint 200 exceeds the preset pressure and at the same time the displacement of the expansion joint 200 exceeds the preset displacement.

[0037] According to some embodiments of the present invention, the alarm device and the display 30 are integrated into one body. In this way, the overall size of the monitoring device 100 can be further reduced, and thus the space required for installing the monitoring device 100 and the expansion joint 200 can be reduced, thereby improving the installation adaptability of the monitoring device 100.

[0038] According to some embodiments of the present invention, the alarm signal is a sound alarm signal and / or a light alarm signal. It can be understood that the alarm signal can be a sound alarm signal, or a light alarm signal, or a sound and light alarm signal.

[0039] Among them, the sound alarm signal has a wide propagation range and a fast propagation speed, which can enable personnel to immediately know the on-site situation even if they are not on-site, enabling personnel to timely discover the abnormality of the expansion joint 200, thereby shortening the processing time and reducing other problems caused by the abnormality of the expansion joint 200.

[0040] The light alarm signal can transmit the working state of the expansion joint 200 to people through lights of different colors. For example, when the expansion joint 200 is in an abnormal state, the alarm device can be set to flash a red signal, and when the expansion joint 200 is in a normal working state, the alarm device can be set to a long green state. In this way, the staff can more intuitively understand the working state of the expansion joint 200.

[0041] According to some embodiments of the present invention, as Figure 1 - Figure 2 shown, the monitoring device 100 further includes: a fixed bracket 40, both ends of the fixed bracket 40 are respectively adapted to be fixedly connected to both ends of the expansion joint 200, and the stress sensor 10, the electronic counter 20 and the display 30 are fixed on the fixed bracket 40. Among them, the fixed bracket 40 mainly provides an installation platform for the stress sensor 10, the electronic counter 20 and the display 30, which is beneficial to the connection between the stress sensor 10 and the expansion joint 200.

[0042] For example Figure 2 shown, the fixed bracket 40 includes a cross bar and two longitudinal bars. Among them, the two longitudinal bars are respectively connected to both ends of the cross bar, so that the fixed bracket 40 is formed into a U shape. The stress sensor 10, the electronic counter 20 and the display 30 are respectively connected in series on the cross bar and are respectively fixed on the expansion joint 200 through both ends of the two longitudinal bars.

[0043] According to some embodiments of the present invention, the fixed bracket 40 is welded to the expansion joint 200. Among them, the welded connection has high connection strength. Therefore, by welding the fixed bracket 40 to the expansion joint 200, the connection strength between the fixed bracket 40 and the expansion joint 200 can be increased, thereby improving the use safety of the monitoring device 100.

[0044] Preferably, the expansion joint 200 includes two end pipes connected to the pipeline equipment and a corrugated pipe connected between the two end pipes. Both ends of the fixed bracket 40 are respectively welded to the end pipes. In this way, interference between the fixed bracket 40 and the corrugated pipe can be avoided, thereby preventing damage to the expansion joint 200.

[0045] According to the monitoring method of the second aspect embodiment of the present invention, the monitoring method is used for the monitoring device 100 for monitoring the cyclic life of the corrugated expansion joint according to the first aspect embodiment of the present invention. The monitoring method includes: The stress sensor 10 detects the real-time operation parameters of the expansion joint 200; specifically, the real-time operation parameters can be stress parameters, displacement parameters, etc.

[0046] When the real-time operating parameter is greater than the preset parameter, the electronic counter 20 counts; for example, when the stress parameter is greater than the preset stress value, the electronic counter 20 counts; or when the displacement parameter is greater than the preset stress value, the electronic counter 20 counts. It should be noted that the preset parameter can be designed according to the actual situation of the expansion joint 200, and the preset parameter can be the stress threshold or displacement threshold of the expansion joint 200.

[0047] According to the count value of the electronic counter 20, calculate the remaining life of the expansion joint 200; specifically, the service life of the expansion joint 200 can be preset, and the difference between the preset service life and the count value of the electronic counter 20 is the remaining life.

[0048] The display 30 displays the remaining life and the real-time operating parameter. In this way, the remaining life of the expansion joint 200 can be more intuitively understood, enabling the staff to carry out replacement work targeted according to its remaining cycle life and avoiding material damage and personal injury incidents.

[0049] According to the monitoring method of the embodiment of the present invention, by displaying the remaining life through the display 30, the remaining life of the expansion joint 200 can be more intuitively understood, enabling the staff to carry out replacement work targeted according to its remaining cycle life and avoiding material damage and personal injury incidents.

[0050] According to some embodiments of the present invention, the real-time operating parameter includes a stress parameter and / or a displacement parameter. Specifically, the stress parameter is mainly the tensile stress or compressive stress generated by the expansion joint 200 during operation, mainly reflecting the force condition of the expansion joint 200 during operation. The displacement parameter is mainly the compression amount or tensile amount generated by the expansion joint 200 during operation, mainly reflecting the force deformation condition of the expansion joint 200 during operation. Among them, it can be determined whether the expansion joint 200 has fatigue damage according to the stress parameter and / or displacement parameter.

[0051] According to some embodiments of the present invention, the monitoring method further includes: When the real-time operating parameter is greater than the preset parameter, the alarm device issues an alarm message.

[0052] Specifically, when the stress of the expansion joint 200 detected by the stress sensor 10 is greater than the preset stress or the detected displacement is greater than the preset displacement, the alarm device issues an alarm signal. At this time, the staff can switch the flow pipeline and then detect and repair the expansion joint 200, thereby effectively avoiding material damage and personal injury incidents caused by the damage of the expansion joint 200.

[0053] It should be noted that the preset parameter in this embodiment can be the preset parameter in the above embodiment, or a preset alarm value set according to the actual situation.

[0054] It should be further noted that the alarm signal here is a light signal. The alarm device displays a red signal through the display 30 to represent the abnormal operation of the expansion joint 200, and displays a green signal through the display 30 for normal operation.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present 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, and therefore should not be construed as a limitation of the present invention.

[0056] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "plurality" is two or more unless otherwise specifically defined.

[0057] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of 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 the present invention can be understood according to specific circumstances.

[0058] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A monitoring device (100) for the cyclic life of a corrugated expansion joint, characterized in that, Comprising: A stress sensor (10), which is adapted to be connected to an expansion joint (200) for detecting the stress of the expansion joint (200); An electronic counter (20), which is electrically connected to the stress sensor (10) and is configured to record the number of times the stress of the expansion joint (200) exceeds a preset pressure; A display (30), which is electrically connected to the stress sensor (10) and the electronic counter (20) and is used for displaying the remaining life, the stress and / or the maximum stress of the expansion joint (200).

2. The monitoring device (100) for the cyclic life of the corrugated expansion joint according to claim 1, characterized in that, The stress sensor (10) is configured to detect the displacement of the expansion joint (200), the electronic counter (20) is configured to record the number of times the displacement exceeds a preset displacement, and the display (30) is adapted to display the displacement and / or the maximum displacement.

3. The monitoring device (100) for the cyclic life of the corrugated expansion joint according to claim 2, characterized in that, Further comprising: An alarm device, which is electrically connected to the stress sensor (10) and is adapted to emit an alarm signal when the stress of the expansion joint (200) exceeds a preset pressure and / or the displacement exceeds a preset displacement.

4. The monitoring device (100) for the cyclic life of the corrugated expansion joint according to claim 3, characterized in that, The alarm device is integrated with the display (30).

5. The monitoring device (100) for the cyclic life of the bellows expansion joint according to claim 3, characterized in that, The alarm signal is a sound alarm signal and / or a light alarm signal.

6. The monitoring device (100) for the cyclic life of the corrugated expansion joint according to claim 1, wherein, Further comprising: A fixed bracket (40), both ends of which are respectively adapted to be fixedly connected to both ends of the expansion joint (200), and the stress sensor (10), the electronic counter (20) and the display (30) are fixed on the fixed bracket (40).

7. The monitoring device (100) for the cyclic life of the corrugated expansion joint according to claim 6, characterized in that, The fixed bracket (40) is connected to the expansion joint (200) by welding.

8. A monitoring method, characterized in that, The monitoring method is used for a monitoring device (100) for the cyclic life of a corrugated expansion joint according to any one of claims 1-7, characterized in that the monitoring method comprises: The stress sensor (10) detects the real-time operating parameters of the expansion joint (200); When the real-time operating parameters are greater than the preset parameters, the electronic counter (20) counts; According to the count value of the electronic counter (20), the remaining life of the expansion joint (200) is calculated; The display (30) displays the remaining life and the real-time operating parameters.

9. The monitoring method according to claim 8, wherein The real-time operating parameters include stress parameters and / or displacement parameters.

10. The monitoring method according to claim 8, wherein Further comprising: When the real-time operating parameters are greater than the preset parameters, the alarm device issues an alarm message.

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