Beam string bending detection sensor

Abstract

The utility model provides a string beam bending detection sensor which comprises an outer pipe, an inner pipe is arranged in the outer pipe, a plurality of strain gauges are arranged on the side wall of the inner pipe in an annular mode, the annular strain gauges form a group, and a plurality of groups of strain gauges are arranged on the side wall of the inner pipe at equal intervals. The side wall of the outer pipe is fixedly connected with a plurality of supports, the inner wall of the outer pipe is fixedly connected with second limiting inclined plane strips at equal angles, the side wall of the inner pipe is fixedly connected with first limiting inclined plane strips at equal angles, and the contact faces between the first limiting inclined plane strips and the second limiting inclined plane strips are inclined planes and are arranged in a staggered mode. According to the utility model, the deformation of the string beam is obtained through the strain gauges.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bending monitoring sensor, especially string beam bending detection sensor. BACKGROUND

[0002] The string beam structure is a kind of hybrid structural system formed by rigid component upper chord, flexible cable and intermediate strut, and its structural composition is a new type of self-balancing system, is a kind of large-span prestressed space structure system, and is a relatively successful creation in the development of hybrid structural system.The string beam structure system is simple, clear in stress, various in structural form, gives full play to the advantages of rigid and flexible materials, and is simple and convenient to manufacture, transport and construct, thus having good application prospect.

[0003] After being put into use, the health condition of building needs to be acquired in real time to provide support for subsequent maintenance and repair.The bending change of string beam is one of health indicators, which represents the stress condition of string beam and the like.The existing technical means for measuring the bending of string beam include vibrating string strain gauge, fiber bragg grating (FBG) sensor and laser ranging, but in the above, vibrating string strain gauge needs to be pre-buried, and installation is complex, fiber bragg grating (FBG) sensor is expensive in demodulation equipment, and laser ranging is affected by ambient light. SUMMARY

[0004] To solve the above problems, the utility model discloses a kind of string beam bending detection sensors, including outer tube, the inside of outer tube is provided with inner tube, the side wall of inner tube is provided with strain gauge, and several strain gauges are annularly arranged, and the strain gauge of annular arrangement is a group, and several groups are arranged at the side wall of inner tube at equal intervals.When inner tube deforms, corresponding strain gauge on it also deforms, i.e.

[0005] The side wall of the outer tube is fixedly connected with a plurality of supports, the inner wall of the outer tube is fixedly connected with a second limiting inclined surface strip at equal angles, the side wall of the inner tube is fixedly connected with a first limiting inclined surface strip at equal angles, the contact surface between the first limiting inclined surface strip and the second limiting inclined surface strip is an inclined surface, and the two are staggered.The arrangement of the plurality of supports ensures that the sensor can deform with the deformation of the string beam, and the first limiting inclined surface strip and the second limiting inclined surface strip are arranged to ensure that the deformation of the string beam can be fully transmitted to the inner tube, ensuring the accuracy of detection.

[0006] Preferably, the outer tube is provided with end caps at both ends, and the end caps abut against the ends of the inner tube, and a sealing ring is arranged between the end caps and the outer tube. The end caps and the sealing ring ensure the relative stability of the inner tube, and facilitate the normal operation of the strain gauges.

[0007] Preferably, a cable is arranged in the middle of one of the end caps. The cable is used for power supply and data transmission.

[0008] Preferably, the middle of the slope of the first limiting slope strip is provided with a positioning groove, and the middle of the slope of the second limiting slope strip is provided with a protruding strip. The positioning groove and the protruding strip are arranged in cooperation. The arrangement of the positioning groove and the protruding strip ensures the accurate position between the outer tube and the inner tube.

[0009] Preferably, the bracket comprises a lower support and an upper support, the lower support and the upper support are arranged in an arc shape, both ends of the lower support are provided with first connecting ends, both ends of the upper support are provided with second connecting ends, the first connecting ends and the second connecting ends are provided with through holes, and bolts and nuts are arranged. The lower support and the upper support are fixed to the outer tube, and the bolts and the nuts are used to fixedly connect the lower support and the upper support.

[0010] Preferably, the lower part of the lower support is fixedly connected with connecting legs on both sides, and the connecting legs are provided with through holes. The connecting legs are fixed with the string beam.

[0011] The beneficial effects of the utility model are as follows:

[0012] 1. A plurality of strain gauges are arranged on the side wall of the inner tube. When the sensor deforms along with the string beam, the resistance of the strain gauge changes. By combining each strain gauge and converting, the bending degree of the string beam can be obtained, which has the advantages of simple installation and easy use.

[0013] 2. A plurality of brackets, first limiting slope strips and second limiting slope strips are arranged, which can ensure that the deformation of the string beam is transmitted to the strain gauges on the inner tube, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic view of the utility model;

[0015] Figure 2 It is an explosion schematic view of the utility model;

[0016] Figure 3 It is Figure 2 It is an enlarged view of A in the middle;

[0017] Figure 4 It is a three-dimensional schematic view of the bracket of the utility model.

[0018] LIST OF REFERENCE NUMERALS:

[0019] 1, outer tube; 2, support; 3, cable; 4, inner tube; 5, sealing ring; 6, end cover; 7, strain gauge; 8, alignment groove; 9, first limiting inclined surface bar; 10, convex strip; 11, second limiting inclined surface bar;

[0020] 21, connecting leg; 22, lower supporting member; 23, first connecting end; 24, second connecting end; 25, upper supporting member. DETAILED DESCRIPTION

[0021] The utility model will be further illustrated below in conjunction with the drawings and specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the utility model and not used to limit the scope of the utility model. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a particular component.

[0022] As shown in the drawings, a string beam bending detection sensor comprises an outer tube 1, which is a circular pipe. An inner tube 4 is arranged inside the outer tube 1. The inner tube 4 has the same structure as the outer tube 1. A strain gauge 7 is arranged on the side wall of the inner tube 4. When the strain gauge 7 deforms, its resistance changes, so that the deformation amount can be calculated. The strain gauges 7 are arranged in a ring shape and form a group. Several groups of strain gauges 7 are arranged at equal distances on the side wall of the inner tube 4. The arrangement of multiple strain gauges 7 can obtain the overall bending condition of the inner tube 4. Figures 1 to 4 The outer tube 1 is fixedly connected with several supports 2. The sensor is fixedly connected to the string beam through the supports 2. The arrangement of multiple supports 2 ensures that the outer tube 1 can deform along with the deformation of the string beam, thereby improving the accuracy of detection. The inner wall of the outer tube 1 is fixedly connected with a second limiting inclined surface bar 11 at equal angles. The side wall of the inner tube 4 is fixedly connected with a first limiting inclined surface bar 9 at equal angles. The contact surface between the first limiting inclined surface bar 9 and the second limiting inclined surface bar 11 is an inclined surface. The arrangement of the inclined surface facilitates the placement of the inner tube 4 inside the outer tube 1. The two are arranged staggered. After the inner tube 4 is placed in the outer tube 1, the inner tube 4 is further pushed, so that the first limiting inclined surface bar 9 and the second limiting inclined surface bar 11 are in full contact, i.e. there is a radial force between the two inclined surfaces. After the outer tube 1 deforms, the first limiting inclined surface bar 9 and the second limiting inclined surface bar 11 can transmit the deformation to the inner tube 4, which is conducive to improving the accuracy of detection.

[0023]

[0024] ​The outer tube 1 is threadedly connected with end covers 6 at both ends, the end covers 6 block the two ends of the outer tube 1, and the end of the end cover 6 abuts against the end of the inner tube 4, that is, the end cover 6 limits the axial movement of the inner tube 4, and a sealing ring 5 is arranged between the end cover 6 and the outer tube 1, and the sealing ring 5 improves the sealing property of the inner part of the outer tube 1.

[0025] The middle part of one of the end covers 6 is provided with a cable 3, and the cable 3 is used for data transmission and power supply.

[0026] The middle part of the inclined surface of the first limiting inclined surface strip 9 is provided with a positioning groove 8, and the middle part of the inclined surface of the second limiting inclined surface strip 11 is provided with a protruding strip 10, the positioning groove 8 and the protruding strip 10 are arranged in cooperation, so that the first limiting inclined surface strip 9 and the second limiting inclined surface strip 11 are matched in position, and the rotation of the inner tube 4 is prevented.

[0027] The bracket 2 comprises a lower supporting piece 22 and an upper supporting piece 25, and the lower supporting piece 22 and the upper supporting piece 25 are both arranged in an arc shape, that is, the outer tube 1 is clamped and fixed between the two, the two ends of the lower supporting piece 22 are provided with first connecting ends 23, the two ends of the upper supporting piece 25 are provided with second connecting ends 24, the first connecting ends 23 and the second connecting ends 24 are both provided with through holes, and bolts and nuts are arranged, the lower supporting piece 22 and the upper supporting piece 25 are fixedly connected by the bolts and nuts, and the outer tube 1 is clamped and held.

[0028] The lower part of the lower supporting piece 22 is fixedly connected with connecting legs 21 on both sides, and the connecting legs 21 are provided with through holes, and bolts and the like are inserted into the through holes to fixedly connect the bracket 2 to the chord beam.

[0029] Further, the outer tube 1 is made of transparent or translucent material, and an LED lamp bead is arranged on one side of the strain gauge 7, so that the sensor can be used as a lamp for lighting or decoration, and a temperature compensation threshold of the strain gauge 7 is further arranged to reduce or even eliminate the influence of temperature.

[0030] The technical means disclosed in the utility model scheme is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes technical schemes composed of any combination of the above technical features.

Claims

1. A string-beam bending detection sensor characterized by, Including outer tube (1), the inside of outer tube (1) is provided with inner tube (4), the side wall of inner tube (4) is provided with strain gauge (7), and several strain gauges (7) are annularly arranged, the annularly arranged strain gauges (7) are a group, and several groups are arranged equidistantly on the side wall of inner tube (4); The side wall of outer tube (1) is fixedly connected with several supports (2), the inner wall of outer tube (1) is fixedly connected with second limiting inclined surface strip (11) at equal angles, the side wall of inner tube (4) is fixedly connected with first limiting inclined surface strip (9) at equal angles, the contact surface between first limiting inclined surface strip (9) and second limiting inclined surface strip (11) is inclined surface, and the two are staggered.

2. A string beam bending detection sensor according to claim 1, characterized in that: Both ends of outer tube (1) are threadedly connected with end cover (6), and the end of end cover (6) abuts against the end of inner tube (4), and sealing ring (5) is arranged between end cover (6) and outer tube (1).

3. A string beam bending detection sensor according to claim 2, characterized in that: The middle part of one of end cover (6) is provided with cable (3).

4. The string beam bending detection sensor of claim 1, wherein: The inclined surface middle part of first limiting inclined surface strip (9) is provided with alignment groove (8), the inclined surface middle part of second limiting inclined surface strip (11) is provided with convex strip (10), and alignment groove (8) and convex strip (10) are matched.

5. The string beam bending detection sensor of claim 1, wherein: The support (2) includes a lower support (22) and an upper support (25), the lower support (22) and the upper support (25) are both arc-shaped, both ends of the lower support (22) are provided with a first connecting end (23), both ends of the upper support (25) are provided with a second connecting end (24), the first connecting end (23) and the second connecting end (24) are both provided with a through hole, and a bolt and a nut are arranged.

6. A string beam bending detection sensor according to claim 5, wherein: The lower part of the lower support (22) is fixedly connected with a connecting leg (21) on both sides, and the connecting leg (21) is provided with a through hole.

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