Measuring device for in-plane displacement of plate edge
By using a counterweight, a flexibly connected slider, and a linear displacement sensor, the problem of multi-directional displacement interference at the edge of a concrete slab by traditional sensors is solved, enabling accurate measurement of in-plane displacement at the edge of the concrete slab and providing a high-precision measurement tool.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-03-24
AI Technical Summary
Traditional linear displacement sensors cannot accurately reflect the true single-dimensional displacement when measuring the in-plane displacement of the edge of a concrete slab, because the multi-directional displacement interference at the edge of the slab causes the probe to tilt or twist, affecting the measurement accuracy.
The system employs a counterweight, a flexibly connected slider, and a linear displacement sensor. The gravity-balanced counterweight defines the in-plane displacement of the plate edge. The vertical sliding cooperation between the slider and the guide rail eliminates vertical interference, maintaining only the horizontal displacement degree of freedom. A linear variable differential transformer is used for measurement.
It achieves clear deconstruction of the composite motion of the plate edge and stable transmission of horizontal displacement, with accurate and reliable measurement, convenient operation, and strong applicability, providing a high-precision measurement tool.
Smart Images
Figure CN224034584U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to panel detection instrument field, especially a kind of measurement device of plate edge surface displacement. BACKGROUND
[0002] In the safety detection of building structure, the bending deformation measurement of concrete slab is an important parameter for evaluating its structural bearing capacity and failure mode. When the concrete slab is subjected to external force, the edge of the slab will not only produce in-plane displacement, but also be accompanied by vertical warping or tilting. This multi-directional composite motion increases the difficulty of measuring single-dimensional displacement.
[0003] The traditional measurement method usually uses a linear displacement sensor fixed directly on the edge of the slab. This scheme has obvious defects: when the probe of the displacement sensor is rigidly connected to the edge of the slab, any displacement of the edge in any direction will be directly transmitted to the probe, causing the probe to not only move horizontally, but also be pulled and tilted or even twisted. Since the measurement principle of the linear displacement sensor relies on the straight-line motion of the probe along the fixed axis, this multi-directional displacement interference makes the sensor unable to accurately reflect the true in-plane displacement of the edge of the test slab.
[0004] Therefore, how to "decompose" the straight-line motion in the target direction from the complex multi-directional motion of the edge of the slab through structural design, and ensure the reliability of displacement transmission during the "decomposition" process, is the core proposition for improving the displacement measurement accuracy of concrete slabs. SUMMARY
[0005] The main technical problem to be solved by the utility model is to provide a measurement device for in-plane displacement of the edge of a slab to accurately and reliably measure the in-plane one-way displacement of the edge of a test slab.
[0006] To solve the above technical problems, the utility model provides a measurement device for in-plane displacement of the edge of a slab, which includes a counterweight, a fixing member, a sliding block and a linear displacement sensor.
[0007] The counterweight is suspended on the edge of a horizontally arranged test slab through the fixing member and maintains a vertical posture; the counterweight and the fixing member are flexibly connected;
[0008] The counterweight is provided with a guide rail in the vertical direction; the sliding block is slidingly installed on the guide rail and is limited in position in the horizontal direction with the counterweight;
[0009] The linear displacement sensor includes a fixed part and a movable probe; the fixed part is horizontally fixed and faces the edge of the test slab perpendicularly; one end of the movable probe is slidingly inserted into the sensing channel of the fixed part, and the other end is connected to the sliding block.
[0010] In a preferred embodiment, the counterweight is a plate arranged in parallel with the edge of the test plate.
[0011] In a preferred embodiment, the top of the counterweight is suspended from the fixing member by flexible pulling members.
[0012] In a preferred embodiment, the top of the counterweight is suspended from the fixing member by flexible pulling members.
[0013] In a preferred embodiment, the top of the counterweight is suspended from the fixing member by flexible pulling members.
[0014] In a preferred embodiment, the fixing member is an expansion bolt, one end of which is anchored in the test plate from the side and the other end of which is cantilevered to connect with the counterweight.
[0015] In a preferred embodiment, the displacement sensor is a linear variable differential transformer, and the fixed part is the coil skeleton of the linear variable differential transformer.
[0016] In a preferred embodiment, the counterweight is a steel plate.
[0017] In a preferred embodiment, the guide rail is a sliding groove arranged through the thickness of the counterweight.
[0018] In a preferred embodiment, the movable probe is fixed perpendicularly to the sliding block.
[0019] Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:
[0020] The measurement device provided by the utility model defines the displacement in the edge surface of the test plate by means of the counterweight self-balanced by gravity. The sliding block is disengaged from the vertical interference caused by the movement of the counterweight by vertical sliding cooperation with the guide rail, and only maintains translational freedom in the horizontal extension direction of the movable probe. Then, the sliding block is horizontally limited with the counterweight, and the same horizontal displacement occurs, which ingeniously disassembles the one-way horizontal displacement from the multidirectional composite motion of the edge of the test plate and macroscopically expresses it, so as to facilitate the linear displacement sensor to directly measure. The measurement device realizes clear disassembly of the edge composite movement and stable transmission of the horizontal displacement by innovative structural design, is not only convenient to operate and has strong applicability, but also is scientific and accurate in measurement, and provides a novel practical tool for related field research. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 FIG. 1 is a front view of a measurement device according to an embodiment of the utility model;
[0022] Figure 2 Figure 2 is a side view of the counterweight structure connection according to the embodiment of the present application.
[0023] Figure 1 The middle dotted line part shows the position change after the displacement of the test plate edge.
[0024] In the figure, 1 is a steel plate, 11 is a guide rail, 2 is a sliding block, 3 is an expansion bolt, 4 is a flexible traction member, 5 is an LVDT sensor, 51 is a coil skeleton, 52 is a movable probe, 6 is a test plate, and 7 is a support. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0026] In the description of the present application, it should be pointed out that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to 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. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0027] In the description of the present application, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be wall-mounted connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, can be indirectly connected through an intermediate medium, can be the communication between two elements, and 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.
[0028] As shown in Figure 1 , Figure 2 The embodiment of the present application provides a plate edge in-plane displacement measuring device, which comprises a displacement decoupling assembly and a linear displacement sensor. The displacement decoupling assembly comprises a counterweight, a sliding block 2 and a fixed part. In the embodiment, the counterweight adopts a steel plate 1, and the fixed part adopts an expansion bolt 3.
[0029] In the present embodiment, the measurement object is a rectangular concrete slab, including ordinary reinforced concrete slab and prestressed concrete slab, etc., hereinafter also referred to as test slab 6. As shown in Figure 1 , the test slab 6 is horizontally placed on the support 7 and will buckle when subjected to external force, resulting in out-of-plane and in-plane displacement of the slab edge. The measurement device is used to measure the in-plane displacement of the test slab 6 after buckling, i.e. the horizontal displacement of the slab edge in the present embodiment.
[0030] The top of the steel plate 1 is fixed to the side edge of the test slab 6 by the expansion bolt 3. Specifically, the expansion bolt 3 is anchored in the test slab 6 from the side at one end and cantilevered at the other end, with the steel plate 1 suspended by the flexible traction member 4. The flexible traction member 4 can be a steel wire or a high-strength fiber rope, which will not be described in detail herein. The steel plate 1 is flexibly connected to the expansion bolt 3, so that the steel plate 1 is not affected by the change in the angle of the slab edge when the test slab 6 buckles, and always maintains a stable vertical state relying on its own gravity. To accurately define the in-plane displacement of the test slab 6, the steel plate 1 needs to maintain a stable spatial posture, therefore, the steel plate 1 is preferably made of high-density material. In other embodiments, counterweight can also be achieved by hanging weights on the bottom of a rigid plate. To avoid the steel plate 1 from deflecting during measurement and affecting the measurement accuracy, in the present embodiment, as shown in Figure 2 , a plurality of groups of flexible traction members 4 are connected to the top of the steel plate 1 in the width direction, and are suspended under the expansion bolt 3 in a multi-point manner, so as to keep the plane direction of the steel plate 1 parallel to the edge of the test slab 6. As an equivalent alternative to the present embodiment, in other embodiments, the steel plate 1 can also be hinged with the expansion bolt 3 in the plane perpendicular to the edge by a rigid connecting member, without the need to set multiple groups of expansion bolts 3 to solve the deflection problem of the steel plate 1.
[0031] As shown in Figure 2As shown, the steel plate 1 is provided with a guide rail 11 in the vertical direction. The guide rail 11 can be provided in various forms. In the present embodiment, the guide rail 11 is a chute provided through the thickness of the steel plate 1. The slider 2 is provided on the guide rail 11 to freely slide in the vertical direction on the steel plate 1. The slider 2 is limited in the out-of-plane direction of the steel plate 1 (i.e. in the horizontal direction). The slider 2 is provided to decompose the movement of the steel plate 1 along the edge of the test plate 6 into vertical movement and horizontal movement when the test plate 6 is bent under force. The slider 2 is decoupled from the vertical movement of the steel plate 1 by relative sliding with the guide rail 11, so that it can always move at the same horizontal level. The slider 2 is limited in the out-of-plane direction of the steel plate 1 to move horizontally with the steel plate 1, thereby representing the horizontal displacement of the steel plate 1. In this way, the in-plane displacement of the edge of the test plate 6 is converted into the horizontal displacement of the slider 2, greatly facilitating the measurement work.
[0032] In the present embodiment, the linear displacement sensor is a linear variable differential transformer, hereinafter referred to as LVDT sensor 5. As shown, Figure 1 The LVDT sensor 5 includes a fixed part and a movable probe 52. Specifically, the fixed part is the coil frame 51 of the LVDT sensor 5, and the movable probe 52 is the inner core of the probe of the LVDT sensor 5. The coil frame 51 is fixed horizontally and faces the edge of the test plate 6. It should be understood that the sensing channel in the coil frame 51 is opposite the guide rail 11 on the steel plate 1, otherwise the probe cannot be connected to the slider 2. The movable probe 52 includes a first end and a second end arranged opposite each other. The first end of the movable probe 52 is provided in the sensing channel of the coil frame 51, and the second end is connected to the slider 2 on the guide rail 11, so that the slider 2 has only one degree of freedom in the extension direction of the movable probe 52. Preferably, the second end of the movable probe 52 is perpendicularly fixed to the slider 2 to further control the steel plate 1 to remain parallel to the edge of the test plate 6 by the linear stiffness of the probe itself. When the test plate 6 is bent under force, the steel plate 1 drives the slider 2 to move horizontally approximately the same as the edge of the test plate 6, and the horizontal movement of the slider 2 drives the end of the movable probe 52 to move axially in the coil frame 51. The coil frame 51 converts this axial displacement into a voltage difference through electromagnetic induction, and the in-plane displacement of the test plate 6 is obtained after calibration and conversion.
[0033] In conclusion, the measuring device provided by the utility model embodiment defines the inboard displacement of the test plate 6 through the gravity self-balancing steel plate 1. The slider 2 is matched with the vertical sliding of the guide rail 11 to remove the vertical interference caused by the movement of the steel plate 1, and only keeps the translational freedom in the horizontal extension direction of the movable probe 52. Then, the slider 2 is matched with the horizontal limiting of the steel plate 1 to have the same horizontal displacement with the latter, ingeniously deconstructs the one-way horizontal displacement from the multidirectional composite motion of the plate edge of the test plate 6 and carries out macro expression, and the LVDT sensor 5 directly measures conveniently. The measuring device realizes the clear deconstruction of the plate edge composite movement and the stable transmission of the horizontal displacement through the innovative structural design, is not only convenient to operate and strong in applicability, but also scientific and accurate in measurement, and provides a novel practical tool for the related field research.
[0034] The above merely describes the preferred specific implementation of the utility model, and does not limit the patent range of the utility model, and any equivalent transformation of the technical contents in the utility model specification belongs to the protection range of the utility model.
Claims
1. A device for measuring in-plane displacement of a plate edge, characterized in that: Includes counterweights, fixtures, sliders, and linear displacement sensors; The counterweight is suspended from the edge of the horizontally set test plate by the fixing member and maintains a vertical posture; the counterweight and the fixing member are flexibly connected. The counterweight is provided with a guide rail in the vertical direction; the slider is slidably mounted on the guide rail and is limited in the horizontal direction with the counterweight. The linear displacement sensor includes a fixed part and a movable probe; the fixed part is horizontally fixed and faces the edge of the test plate perpendicular to it; one end of the movable probe slides through the sensing channel of the fixed part, and the other end is connected to the slider.
2. The measuring device for in-plane displacement of a plate edge according to claim 1, characterized in that: The counterweight is a plate that is set parallel to the edge of the test plate.
3. The measuring device for in-plane displacement of a plate edge according to claim 1, characterized in that: The top of the counterweight is suspended from the fixing member by a flexible traction member.
4. The measuring device for in-plane displacement of a plate edge according to claim 3, characterized in that: The top of the counterweight is connected to multiple sets of flexible traction members at intervals in the width direction, and is suspended at multiple points below the fixing member.
5. The measuring device for in-plane displacement of a plate edge according to claim 1, characterized in that: The top of the counterweight is hinged to the fixing member in a plane perpendicular to the edge of the test plate via a rigid connector.
6. A measuring device for in-plane displacement of a plate edge according to any one of claims 1 to 5, characterized in that: The fastener is an expansion bolt; one end of the expansion bolt is anchored to the test plate from the side, and the other end protrudes out to connect with the counterweight.
7. A measuring device for in-plane displacement of a plate edge according to any one of claims 1 to 5, characterized in that: The displacement sensor employs a linear variable differential transformer; the fixing part is the coil frame of the linear variable differential transformer.
8. The measuring device for in-plane displacement of a plate edge according to claim 2, characterized in that: The counterweight is a steel plate.
9. A measuring device for in-plane displacement of a plate edge according to any one of claims 2 or 8, characterized in that: The guide rail is a groove that extends through the counterweight in the thickness direction.
10. The measuring device for in-plane displacement of a plate edge according to claim 1, characterized in that: The movable probe is perpendicularly fixed to the slider.