A kind of elbow pressure balance type expansion joint transmission mechanical impedance testing device

Abstract

The application provides a kind of elbow pressure balance type expansion joint transmission mechanical impedance testing device, and its pressing equipment is connected to elbow pressure balance type expansion joint, for elbow pressure balance type expansion joint is pressed;Input end decoupling mechanism is connected to the input end of elbow pressure balance type expansion joint, for elbow pressure balance type expansion joint is excited and elastically limited;Resistance mass mechanism is installed on output end decoupling mechanism, and is connected to the output end of the bottom of elbow pressure balance type expansion joint, for the vibration output of elbow pressure balance type expansion joint is blocked;Output end decoupling mechanism supports and elastically limits elbow pressure balance type expansion joint.The device and method can quickly and accurately test the transmission mechanical impedance characteristics of elbow pressure balance type expansion joint under different pressure conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship pipeline, in particular to a kind of elbow pressure balance type expansion joint transmission mechanical impedance testing device. BACKGROUND

[0002] Elbow pressure balance type expansion joint is composed of two working bellows connected by a working bellows or intermediate pipe, a balance bellows, an elbow or tee, a head, a pull rod and other structural members, which is mainly used in ship pipeline system to absorb axial and lateral combined displacement and balance bellows pressure thrust expansion joint, and its transmission mechanical impedance characteristics are directly related to the safety, stability and service life of pipeline system. Therefore, accurately measuring the transmission mechanical impedance characteristics of elbow pressure balance type expansion joint is an important requirement in the design of ship pipeline system engineering.

[0003] There is currently a lack of tool design method for indirect method transmission mechanical impedance of elbow pressure balance type expansion joint. Since elbow pressure balance type expansion joint exists deformation, deflection or instability under pressure state, it needs to be effectively limited, but the limitation cannot affect the measurement of transmission mechanical impedance, and reasonable decoupling needs to be carried out. SUMMARY

[0004] One of the purposes of the present application is to provide an elbow pressure balance type expansion joint transmission mechanical impedance testing device, which solves the technical problem of simulating the transmission mechanical impedance testing of elbow pressure balance type expansion joint under actual working pressure, can effectively measure the transmission mechanical impedance of elbow pressure balance type expansion joint under different pressures, overcomes the shortcomings of existing transmission mechanical impedance testing technology, and provides an elbow pressure balance type expansion joint transmission mechanical impedance testing device that can simulate the actual working state and working pressure, to meet the reliability and accuracy requirements of elbow pressure balance type expansion joint transmission mechanical impedance measurement.

[0005] The technical solution of the present application is:

[0006] An expansion joint transmission mechanical impedance testing device, comprising a pressure device, an elbow pressure balance type expansion joint, an input end decoupling mechanism, a blocking mass mechanism and an output end decoupling mechanism; the pressure device is connected to the elbow pressure balance type expansion joint, for pressing the elbow pressure balance type expansion joint; the input end decoupling mechanism is connected to the input end of the elbow pressure balance type expansion joint, for exciting and elastically limiting the elbow pressure balance type expansion joint; the blocking mass mechanism is installed on the output end decoupling mechanism and connected to the output end of the bottom of the elbow pressure balance type expansion joint, for blocking the vibration output of the elbow pressure balance type expansion joint; and the output end decoupling mechanism supports and elastically limits the elbow pressure balance type expansion joint.

[0007] As a technical scheme of the present application, the input end decoupling mechanism comprises a portal frame, a plurality of first air bag support groups and an adapter assembly; the portal frame is arranged at the input end of the elbow pressure balance expansion joint at intervals; the adapter assembly is arranged in the inner cavity of the portal frame and connected to the inner circumferential wall of the portal frame through a plurality of first air bag support groups; the adapter assembly is drivingly connected to the input end of the elbow pressure balance expansion joint for exciting the elbow pressure balance expansion joint.

[0008] As a technical scheme of the present application, the first air bag support group comprises at least one first air bag and two support seats; one of the support seats is mounted on the inner wall of the portal frame and the other support seat is mounted on the outer wall of the adapter assembly; the first air bag is mounted between the two support seats.

[0009] As a technical scheme of the present application, the adapter assembly comprises an adapter frame, an exciter and a first transition cover plate; one end of the adapter frame is connected to the inner circumferential wall of the portal frame through a plurality of first air bag support groups and the other end is connected to one side of the first transition cover plate; the other side of the first transition cover plate is connected to the input end of the elbow pressure balance expansion joint, the first transition cover plate is provided with excitation holes at the center and the circumferential radial direction, force sensors are arranged in the excitation holes at the center or the circumferential radial direction for detecting excitation force response; a plurality of first acceleration sensors are arranged on the first transition cover plate at intervals, the direction of the first acceleration sensors is consistent with the excitation direction of the exciter for obtaining the vibration response of the input end of the elbow pressure balance expansion joint; the exciter is connected to the force sensor through a top rod for providing excitation along the length direction of the top rod to the elbow pressure balance expansion joint.

[0010] As a technical scheme of the present application, the adapter frame comprises a mouth-shaped frame, a plurality of positioning plates and an annular plate; the mouth-shaped frame is connected to the inner circumferential wall of the portal frame through a plurality of first air bag support groups at the circumferential side and has a circular positioning port on one side; the annular plate is mounted on the first transition cover plate and coaxially arranged with the first transition cover plate; a plurality of positioning plates are arranged at intervals outside the circumferential side of the exciter and the two ends are respectively connected to the side wall of the mouth-shaped frame and the annular plate.

[0011] As a technical scheme of the present application, the first transition cover plate is provided with a water injection hole and an exhaust hole for connecting with the pressing equipment.

[0012] As a technical scheme of the present application, the blocking mass mechanism comprises a second transition cover plate and a blocking mass; the second transition cover plate is installed on the top of the blocking mass and connected with the flange of the output end of the elbow pressure balance expansion joint; the blocking mass is installed on the output end decoupling mechanism and a plurality of second acceleration sensors are installed on the outer circumferential wall of the blocking mass at intervals; the blocking mass is used to block the vibration output of the elbow pressure balance expansion joint; the direction of the second acceleration sensor is consistent with the direction of the excitation generated by the input end decoupling mechanism, and the vibration response of the output end of the elbow pressure balance expansion joint is obtained.

[0013] As a technical scheme of the present application, the output end decoupling mechanism comprises an adapter plate, two groups of second air bag support groups, four groups of third air bag support groups, a support frame and four support plates; the adapter plate is installed at the middle part of the top surface of the support frame; the blocking mass mechanism is installed on the adapter plate; the support plates are arranged at intervals below the support frame and correspond to the four side edges of the support frame one by one; two groups of the second air bag support groups are respectively installed between the bottom of the support frame and the top surface of the corresponding support plate; four groups of the third air bag support groups are respectively connected between the top of the periphery of the support frame and the top surface of the corresponding support plate.

[0014] As a technical scheme of the present application, the second air bag support group comprises a second air bag and a limiting seat, the limiting seat is installed between the bottom of the support frame and the top surface of the corresponding support plate; the second air bag is installed in the cavity of the limiting seat; the third air bag support group comprises a third air bag, a connecting seat and a positioning seat, the positioning seat is installed on the top of the periphery of the support frame, the connecting seat is installed on the top surface of the support plate, and the third air bag is installed between the positioning seat and the connecting seat.

[0015] The present application has the following beneficial effects:

[0016] The bending pipe pressure balance type expansion joint transmission mechanical impedance testing device of the application can effectively ensure the reliability and accuracy of data through dynamic decoupling of the exciter by a plurality of first air bags, weakening of the coupling between the blocking mass and other structures by a plurality of second air bags and a plurality of third air bags, and transmission of the input end decoupling mechanism, the blocking mass mechanism and the output end decoupling mechanism. Meanwhile, the device obtains the vibration transmission rate through the data measured by the first acceleration sensor at the input end and the second acceleration sensor at the output end, and obtains the blocking force through the blocking mass and the second acceleration sensor at the output end, so as to obtain the transmission mechanical impedance of the bending pipe pressure balance type expansion joint, greatly improving the efficiency of the test. Moreover, the device and method solve the technical problem of testing the transmission mechanical impedance of the bending pipe pressure balance type expansion joint under the actual working pressure, and the transmission mechanical impedance of the bending pipe pressure balance type expansion joint under different pressures can be effectively measured through the device. In addition, the device overcomes the shortcomings of the existing transmission mechanical impedance testing technology, and provides a bending pipe pressure balance type expansion joint transmission mechanical impedance testing device capable of simulating the actual working state and working pressure, so as to meet the demand for reliability and accuracy of the bending pipe pressure balance type expansion joint transmission mechanical impedance measurement. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0018] Figure 1 The expansion joint transmission mechanical impedance testing device provided by the embodiments of the application is shown in the schematic diagram.

[0019] Figure 2 The first angle schematic diagram of the expansion joint transmission mechanical impedance testing device provided by the embodiments of the application is shown.

[0020] Figure 3 The input end decoupling mechanism provided by the embodiments of the application is shown in the schematic diagram.

[0021] Figure 4 The switching assembly provided by the embodiments of the application is shown in the schematic diagram.

[0022] Figure 5 The blocking mass mechanism provided by the embodiments of the application is shown in the schematic diagram.

[0023] Figure 6 The output end decoupling mechanism provided by the embodiments of the application is shown in the schematic diagram.

[0024] Figure 7A first angle diagram of an output decoupling mechanism provided by the embodiment of the present application;

[0025] Figure 8 A connection diagram of components in a mechanical impedance test method provided by the embodiment of the present application.

[0026] Icon: 1 - pressing device; 2 - elbow pressure balance expansion joint; 3 - input decoupling mechanism; 4 - blocking mass mechanism; 5 - output decoupling mechanism; 6 - gantry; 7 - first air bag support group; 8 - adapter assembly; 9 - first air bag; 10 - support seat; 11 - adapter frame; 12 - exciter; 13 - first transition cover plate; 14 - force sensor; 15 - first acceleration sensor; 16 - ejector rod; 17 - mouth frame; 18 - positioning plate; 19 - ring plate; 20 - second transition cover plate; 21 - blocking mass; 22 - second acceleration sensor; 23 - adapter plate; 24 - support frame; 25 - support plate; 26 - second air bag; 27 - limit seat; 28 - third air bag; 29 - connecting seat; 30 - positioning seat; 31 - signal generator; 32 - power amplifier; 33 - vibration acquisition and analysis system; 34 - foundation. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts are within the scope of protection of the present application.

[0029] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] Furthermore, in the present application, unless specifically stated and limited otherwise, the first feature above or below the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, over and on the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in horizontal height than the second feature. The first feature below, under and under the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the first feature is lower in horizontal height than the second feature.

[0032] Furthermore, the terms "horizontal", "vertical" and the like terms do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the present application, it should also be noted that, unless specifically stated and limited otherwise, the terms "provided", "connected", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] Embodiment:

[0035] Please refer to Figure 1 , combined with reference to Figures 2 to 8The application provides a kind of expansion joint transmission mechanical impedance testing device, it mainly includes pressing equipment 1, elbow pressure balance type expansion joint 2, input end decoupling mechanism 3, resistance mass mechanism 4 and output end decoupling mechanism 5;Wherein, its pressing equipment 1 is connected to elbow pressure balance type expansion joint 2, for elbow pressure balance type expansion joint 2 is pressed;While, its input end decoupling mechanism 3 is connected to the input end of elbow pressure balance type expansion joint 2, for elbow pressure balance type expansion joint 2 is excited and elastically limited, also for isolating the coupling effect between elbow pressure balance type expansion joint 2 and other structures;In addition, resistance mass mechanism 4 is installed on output end decoupling mechanism 5, and is connected to the output end of the bottom of elbow pressure balance type expansion joint 2, for resisting the vibration output of elbow pressure balance type expansion joint 2 and determining the size of resistance force;Output end decoupling mechanism 5 is arranged on foundation 34 and is connected resistance mass block 21, and elbow pressure balance type expansion joint 2 is elastically limited, for supporting elbow pressure balance type expansion joint 2 and limiting its output end deformation, and for weakening the coupling effect between resistance mass block 21 and other structures.The testing device structure is reasonable, fills the blank of elbow pressure balance type expansion joint 2 indirect method in high frequency band transmission mechanical impedance measurement method.

[0036] Further, input end decoupling mechanism 3 mainly includes portal frame 6, multiple groups of first air bag support groups 7 and adapter assembly 8;Wherein, portal frame 6 is arranged at the input end of elbow pressure balance type expansion joint 2 with interval, and it includes two bottom plates, door-shaped frame and connecting base, door-shaped frame is installed on two bottom plates, connecting base is parallel with bottom plate, and its two ends are vertically connected to the inner walls of opposite sides of door-shaped frame respectively, and it forms a mouth-shaped together with door-shaped frame, and is surrounded with door-shaped frame to form a cavity for installing first air bag support group 7 and adapter assembly 8;While, its adapter assembly 8 is arranged in the inner cavity of portal frame 6, and the periphery is connected with the inner peripheral wall of portal frame 6 through multiple groups of first air bag support groups 7.First air bag support group 7 is used for limiting and dynamically decoupling the input end of elbow pressure balance type expansion joint 2.

[0037] Specifically, the first air bag support group 7 comprises two first air bags 9 and two support seats 10, one of which is installed on the corresponding inner wall of the door-shaped frame or the connecting base, and the other is installed on the corresponding outer wall of the mouth-shaped frame 17 on the adapter frame 11 in the adapter assembly 8, and the two first air bags 9 are installed between the two support seats 10 at intervals; the adapter assembly 8 is drivingly connected to the input end of the elbow pressure balance expansion joint 2 for exciting the elbow pressure balance expansion joint 2. At the same time, the support seat 10 comprises a connecting bracket and an adjusting plate, the adjusting plate is provided with a plurality of vertically arranged strip-shaped holes, the door frame 6 is provided with a plurality of connecting holes arranged at intervals along the length direction, the connecting bracket is connected between the first air bag 9 and the adjusting plate, and the adjusting plate is detachably connected to the corresponding connecting hole of the door frame 6 through bolts. When it is necessary to adjust the installation position of the first air bag 9 on the door frame 6, only the bolts need to be removed, the adjusting plate is moved to the set position, and then the adjusting plate is installed on the door frame 6 through the bolts.

[0038] Therefore, the input end decoupling mechanism 3 is connected with the flange of the input end of the elbow pressure balance expansion joint 2 through the adapter assembly 8 of the input end, can adjust the input end to the balance position by adjusting the air pressure in the first air bag 9, thereby preventing the input end from being deformed unstably when the elbow pressure balance expansion joint 2 is pressed, and can weaken the coupling effect between the elbow pressure balance expansion joint 2 and other structures through the first air bag support group 7.

[0039] Specifically, the adapter assembly 8 comprises an adapter frame 11, an exciter 12 and a first transition cover plate 13, the adapter frame 11 comprises a mouth frame 17, a plurality of positioning plates 18 and an annular plate 19, the peripheral side of the mouth frame 17 is connected with the inner peripheral wall of the portal frame 6 through a plurality of first air bags 9, and a circular positioning port is formed on one side of the mouth frame 17; the annular plate 19 is installed on one side surface of the first transition cover plate 13 and is coaxially arranged with the first transition cover plate 13; the exciter 12 is connected with the force sensor 14 through a top rod 16, is used for generating an excitation force, and provides excitation along the length direction of the top rod 16 to the elbow pressure balance type expansion joint 2; the plurality of positioning plates 18 are peripherally arranged outside the peripheral side of the exciter 12, and the two ends are respectively connected with the side wall of the mouth frame 17 and the annular plate 19; the first transition cover plate 13 is a circular plate, the other side surface of the first transition cover plate 13 is connected with a flange at the input end of the elbow pressure balance type expansion joint 2, and excitation holes are arranged at the center and the circumferential radial direction of the first transition cover plate 13, the force sensor 14 is one, is installed in the excitation hole at the center or the excitation hole at the circumferential radial direction, and is used for detecting an excitation force response; a plurality of first acceleration sensors 15 are also peripherally arranged on the first transition cover plate 13, the direction of the first acceleration sensors 15 is consistent with the excitation direction generated by the exciter 12, is used for acquiring a vibration response of the input end of the elbow pressure balance type expansion joint 2 and collecting acceleration signals of the input end of the elbow pressure balance type expansion joint 2 in real time, specifically, in the embodiment, the first acceleration sensors 15 are four, and are peripherally arranged on the first transition cover plate 13 at equal intervals. In addition, the first transition cover plate 13 is provided with a water injection hole and an exhaust hole for connecting with the pressing equipment 1, before testing, the elbow pressure balance type expansion joint 2 can be pressurized by using a pump to inject water into the inside of the elbow pressure balance type expansion joint 2 to the required pressure, and then the water injection hole and the exhaust hole are sealed. After the elbow pressure balance type expansion joint 2 is pressurized, the water injection hole and the exhaust hole need to be sealed, and the air pressure of the first air bag 9 needs to be adjusted to ensure that the elbow pressure balance type expansion joint 2 is in a balanced state.

[0040] It should be noted that when the axial excitation is performed, the force sensor 14 is installed in the central excitation hole of the first transition cover plate 13, and a limiting table is installed in the circular positioning port of the mouth frame 17, the exciter 12 is installed on the limiting table and is connected with the force sensor 14 through the top rod 16, can generate an excitation force, and provides excitation along the length direction of the top rod 16 to the elbow pressure balance type expansion joint 2; when the radial excitation is performed, the force sensor 14 is installed in the excitation hole at the circumferential radial direction of the first transition cover plate 13, and a support table is peripherally arranged at a position corresponding to the force sensor 14, the exciter 12 is placed on the support table, and the exciter 12 is connected with the force sensor 14 through the top rod 16, can generate an excitation force, and provides excitation along the length direction of the top rod 16 to the elbow pressure balance type expansion joint 2.

[0041] In addition, the exciter 12 can be replaced by a force hammer, etc., to generate the excitation force by the force hammer.

[0042] When the input end of the elbow pressure balance expansion joint 2 is deformed unstably due to the pressurization during the test, the adapter frame 11 connected with the flange of the input end is displaced, and then the adapter frame 11 is eccentric and not at the center position of the portal frame 6, the adapter frame 11 can be returned to the set center position by adjusting the air pressure of the first air bag 9 around the adapter frame 11.

[0043] Further, the blocking mass mechanism 4 comprises a second transition cover plate 20 and a blocking mass 21; the second transition cover plate 20 is a circular plate, which is installed on the top of the blocking mass 21 and connected with the flange of the output end of the elbow pressure balance expansion joint 2; the blocking mass 21 is in the shape of a cylinder, which is installed on the adapter plate 23 of the output end decoupling mechanism 5, and a plurality of second acceleration sensors 22 are installed on the outer peripheral wall of the blocking mass 21 at intervals; the blocking mass 21 is used to block the vibration output of the elbow pressure balance expansion joint 2, so that the vibration of the blocking mass 21 is consistent with the vibration of the flange of the output end of the elbow pressure balance expansion joint 2, and the size of the blocking force is determined, and the shape and mass of the blocking mass 21 need to be selected according to the upper limit of the test frequency; specifically, in the embodiment, the second acceleration sensors 22 are four and arranged on the outer peripheral wall of the blocking mass 21 at equal intervals, the acceleration of the blocking mass 21 is measured by the second acceleration sensors 22 of the output end, so as to determine the size of the blocking force; at the same time, the directions of the second acceleration sensors 22 are consistent with the excitation direction generated by the exciter 12, which is used to obtain the vibration response of the output end of the elbow pressure balance expansion joint 2.

[0044] When the excitation direction is changed, the directions of the first acceleration sensors 15 of the input end and the second acceleration sensors 22 of the output end also need to be adjusted to be consistent with the excitation direction; which is used to measure the acceleration signals of the input end and the output end in real time. The shape and mass of the blocking mass 21 need to be selected according to the upper limit of the test frequency.

[0045] Further, the output decoupling mechanism 5 comprises a transition plate 23, two sets of second air bag support groups, four sets of third air bag support groups, a support frame 24 and four support plates 25; wherein the circular transition plate 23 is installed at the middle part of the top surface of the support frame 24 in a grid shape; the blocking mass 21 is installed on the transition plate 23; the four support plates 25 are all arranged at intervals below the support frame 24 and correspond to the four sides of the support frame 24 one by one, wherein two support plates 25 are directly below the opposite two sides of the support frame 24, and the other two support plates 25 are obliquely below the other two sides of the support frame 24; the two sets of second air bag support groups are respectively installed between the bottom of the support frame 24 and the top surface of the corresponding support plate 25, and are used to support the output end of the elbow pressure balance expansion joint 2 and weaken the coupling action between the blocking mass 21 and other structures, and each set of second air bag support group comprises a second air bag 26 and a limiting seat 27, the limiting seat 27 is installed between the bottom of one side of the support frame 24 and the top surface of the corresponding support plate 25, and the second air bag 26 is installed in the cavity of the limiting seat 27; the four sets of third air bag support groups are respectively connected between the top of the periphery of the support frame 24 and the top surface of the corresponding support plate 25, and are used to limit the deformation of the output end of the elbow pressure balance expansion joint 2 and weaken the coupling action between the blocking mass 21 and the second air bag support group, and each set of third air bag support group comprises a third air bag 28, a connecting seat 29 and a positioning seat 30, the positioning seat 30 is installed on the top of the edge of the support frame 24, the connecting seat 29 is installed on the top surface of the support plate 25, and the third air bag 28 is installed between the positioning seat 30 and the connecting seat 29.

[0046] The support frame 24 connects the blocking mass 21 and the foundation 34, and is supported and limited by the second air bag 26 group and the third air bag 28 group to weaken the coupling action between the blocking mass 21 and other structures.

[0047] It should be noted that in the present embodiment, each group of second air bag support group includes four second air bags 26, the limiting seat 27 includes a bottom plate and a top plate, the bottom plate is fixed on the top surface of the support plate 25 by a plurality of bolts, the top plate is installed on the top of the second air bag 26, and the second air bag 26 is placed on the bottom plate; the support bolts are arranged on the four corner ends of the top plate, when the second air bag 26 is full of gas before testing and placed on the bottom plate, the grid-shaped support frame 24 on the support plate 25 is supported during the testing process, at this time, the second air bag 26 is in an inflated state, and there is a certain gap between the support bolt and the support plate 25; when the testing is completed, the second air bag 26 is in a deflated state, in order to prevent the structure above the second air bag 26 from being excessively crushed and damaged, the structure above the second air bag 26 presses the four support bolts to the position of abutting on the support plate 25 at this time, and the support bolt abuts on the top surface of the support plate 25, thereby supporting the structure above the second air bag 26.

[0048] Each group of third air bag support group includes two third air bags 28, and a plurality of connecting holes are formed on the support plate 25, and a plurality of strip-shaped holes are formed on the connecting seat 29, and the strip-shaped holes of the connecting seat 29 are connected with the connecting holes on the support plate 25 by a plurality of bolts; if the position of the third air bag 28 is to be adjusted, the bolts are removed, the connecting seat 29 is moved to the set position, and then the strip-shaped holes on the connecting seat 29 are connected with the connecting holes on the support plate 25 by a plurality of bolts.

[0049] In addition, the first air bag 9, the second air bag 26 and the third air bag 28 all have air holes, and the first air bag 9, the second air bag 26 and the third air bag 28 can be inflated by an air compressor. The model and size of the first air bag 9, the second air bag 26 and the third air bag 28 are not specifically required, but the natural frequency thereof needs to be much smaller than the lower limit frequency of the test, and the air pressure of the first air bag 9, the second air bag 26 and the third air bag 28 needs to be adjusted by the air compressor after each pressing, so that the elbow pressure balance type expansion joint 2 remains in a balanced state.

[0050] The input end decoupling mechanism 3 can also be suspended by a flexible sling to better simulate the free state of the input end of the elbow pressure balance type expansion joint 2. The first acceleration sensor 15 of the input end is pasted on the first transition cover plate 13 of the input end with an aluminum block base, and the second acceleration sensor 22 of the output end is pasted on the second transition cover plate 20 of the output end with an aluminum block base, which are respectively used for measuring the acceleration data of the input end and the output end in real time.

[0051] It should be noted that the mechanical impedance test using the present device mainly includes the following steps:

[0052] The input end of the elbow pressure balance expansion joint 2 is limited by the first air bag support group 7, the output end of the elbow pressure balance expansion joint 2 is installed on the blocking mass 21 supported and limited by the second air bag support group and the third air bag support group, and is fixed on the foundation 34;

[0053] The elbow pressure balance expansion joint 2 is water-pressurized to the set pressure by using the pressurizing equipment 1;

[0054] The sweep frequency or white noise signal in the test frequency range is set by the signal generator 31, the sweep frequency or white noise signal in the test frequency range is amplified by the power amplifier 32, and is transmitted to the exciter 12; after receiving the signal, the exciter 12 excites the elbow pressure balance expansion joint 2 through the first transition cover plate 13; the first acceleration sensor 15 at the input end is used to measure the acceleration signal on the first transition cover plate 13, the second acceleration sensor 22 at the output end is used to measure the acceleration signal on the blocking mass 21, and the measurement signals are sent to the vibration collection and analysis system 33 for data collection and analysis, so as to indirectly calculate the transmission mechanical impedance of the elbow pressure balance expansion joint 2.

[0055] As can be seen from the above, the elbow pressure balance expansion joint transmission mechanical impedance test device can effectively ensure the reliability and accuracy of the data through the transmission of the input end decoupling mechanism 3, the blocking mass mechanism 4 and the output end decoupling mechanism 5; at the same time, the device obtains the vibration transmission rate through the data measured by the first acceleration sensor 15 at the input end and the second acceleration sensor 22 at the output end, and obtains the blocking force through the blocking mass 21 and the second acceleration sensor 22 at the output end, so as to obtain the transmission mechanical impedance of the elbow pressure balance expansion joint 2, which greatly improves the test efficiency. Moreover, the device and method solve the technical problem of testing the transmission mechanical impedance of the elbow pressure balance expansion joint 2 under the simulated actual working pressure, and the transmission mechanical impedance of the elbow pressure balance expansion joint 2 under different pressures can be effectively measured by the device. In addition, the device overcomes the shortcomings of the existing transmission mechanical impedance test technology, and provides an elbow pressure balance expansion joint 2 transmission mechanical impedance test device which can simulate the actual working state and working pressure, so as to meet the reliability and accuracy requirements of the elbow pressure balance expansion joint 2 transmission mechanical impedance measurement.

[0056] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An apparatus for testing the transfer of mechanical impedance of an expansion joint, comprising: The device comprises a pressing device, a bend pressure balance type expansion joint, an input end decoupling mechanism, a blocking mass mechanism and an output end decoupling mechanism; the pressing device is connected to the bend pressure balance type expansion joint and used for pressing the bend pressure balance type expansion joint; the input end decoupling mechanism is connected to the input end of the bend pressure balance type expansion joint and used for exciting and elastically limiting the bend pressure balance type expansion joint, and comprises a portal, a plurality of first air bag support groups and an adapter assembly; the portal is arranged at the input end of the bend pressure balance type expansion joint at intervals; the adapter assembly comprises an adapter frame and a first transition cover plate; one end of the adapter frame is connected to the inner circumferential wall of the portal through a plurality of first air bag support groups, and the other end is connected to one side of the first transition cover plate; the other side of the first transition cover plate is connected to the input end of the bend pressure balance type expansion joint; the blocking mass mechanism is installed on the output end decoupling mechanism and connected to the output end of the bottom of the bend pressure balance type expansion joint, and used for blocking the vibration output of the bend pressure balance type expansion joint, and comprises a second transition cover plate and a blocking mass; the second transition cover plate is installed on the top of the blocking mass and connected to the flange of the output end of the bend pressure balance type expansion joint; the output end decoupling mechanism supports and elastically limits the bend pressure balance type expansion joint, and comprises an adapter plate, two second air bag support groups, four third air bag support groups, a support frame and four support plates; the adapter plate is installed at the middle part of the top surface of the support frame; the blocking mass mechanism is installed on the adapter plate; the support plates are arranged at intervals below the support frame and correspond to the four side edges of the support frame one by one; two second air bag support groups are respectively installed between the bottom of the support frame and the top surface of the corresponding support plate; four third air bag support groups are respectively connected between the top of the periphery of the support frame and the top surface of the corresponding support plate.

2. The expansion joint transfer mechanical impedance test device of claim 1, wherein, The adapter assembly is drivingly connected to the input end of the bend pressure balance type expansion joint and used for exciting the bend pressure balance type expansion joint.

3. The expansion joint transfer mechanical impedance test device of claim 2, wherein, The first air bag support group comprises at least one first air bag and two support seats; one of the support seats is installed on the inner wall of the portal, and the other support seat is installed on the outer wall of the adapter assembly; the first air bag is installed between the two support seats.

4. The expansion joint transfer mechanical impedance test apparatus of claim 2, wherein, The adapter assembly further comprises an exciter; the first transition cover plate is provided with excitation holes at the center and the circumferential radial direction; force sensors are arranged in the excitation holes at the center or the circumferential radial direction and used for detecting excitation force response; a plurality of first acceleration sensors are arranged on the first transition cover plate at intervals and used for acquiring the vibration response of the input end of the bend pressure balance type expansion joint; the exciter is connected to the force sensor through a top rod and used for providing excitation along the length direction of the top rod to the bend pressure balance type expansion joint.

5. The expansion joint transfer mechanical impedance test apparatus of claim 4, wherein, The adapter frame comprises a mouth frame, a plurality of positioning plates and a ring plate; the mouth frame is connected to the inner circumferential wall of the portal frame through a plurality of first air bag support groups, and has a circular positioning port on one side; the ring plate is coaxially arranged on the first transition cover plate; a plurality of positioning plates are arranged at intervals outside the circumferential side of the exciter, and the two ends are respectively connected to the side wall of the mouth frame and the ring plate.

6. The expansion joint transfer mechanical impedance test apparatus of claim 4, wherein, The first transition cover plate is provided with a water injection hole and an exhaust hole for connecting to the pressing equipment.

7. The expansion joint transfer mechanical impedance test apparatus of claim 1, wherein, A plurality of second acceleration sensors are arranged at intervals on the outer circumferential wall of the blocking mass, and the blocking mass is used for blocking the vibration output of the elbow pressure balance type expansion joint; the direction of the second acceleration sensor is consistent with the excitation direction generated by the input end decoupling mechanism, and is used for obtaining the vibration response of the output end of the elbow pressure balance type expansion joint.

8. The expansion joint transfer mechanical impedance test apparatus of claim 1, wherein, The second air bag support group comprises a second air bag and a limiting seat, the limiting seat is arranged between the bottom of the support frame and the top surface of the corresponding support plate, and the second air bag is arranged in the cavity of the limiting seat; the third air bag support group comprises a third air bag, a connecting seat and a positioning seat, the positioning seat is arranged on the top of the periphery of the support frame, the connecting seat is arranged on the top surface of the support plate, and the third air bag is arranged between the positioning seat and the connecting seat.

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