Auxiliary fixing device based on acoustic emission tunnel defect detection

Abstract

The utility model discloses an auxiliary fixing device based on acoustic emission tunnel defect detection, which comprises a cross rod, one end of the cross rod is rotatably connected with a mounting bracket, a box body is rotatably mounted on the mounting bracket, when the cross rod is in a horizontal position, the opening end of the box body is upward, and the opening end of the box body is downward. A detection probe of an acoustic emission detector is installed in the box body, the orientation of the detection end of the detection probe is the same as the opening direction of the box body, the detection end of the detection probe protrudes out of the opening of the box body, and the rotating center line of the box body is perpendicular to the transverse rod. The position of the detection probe of the acoustic emission sensor can be conveniently adjusted, so that the detection probe is attached to the inner side face of a tunnel to be detected, and the detection precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete crack detection, in particular to an auxiliary fixing device based on acoustic emission tunnel defect detection. Background Art

[0002] Tunnel engineering is a common project for railways, highways, and subways. During tunnel acceptance, the quality of the concrete in the tunnel needs to be tested. With the advancement of technology, acoustic emission sensors are used in concrete crack detection. Acoustic emission detection technology evaluates the quality of concrete structures by detecting tiny cracks and damage inside the concrete. During detection, the sensor is placed on the concrete surface, and the quality of the concrete is judged by detecting the sound wave signal inside the concrete. Because the height of the tunnel is generally high, when testing the tunnel, the inspectors often need to stand on it with the help of tools to place the detection probe of the acoustic emission sensor on the concrete surface of the inner wall of the tunnel. When testing the concrete at the inner top of the tunnel or near the inner top, the inspectors stand at a high position, which poses a great safety hazard.

[0003] The patent with application number 202220756018.4 discloses an auxiliary support device for tunnel defect detection, including a support frame, a support rod installed on the top of the support frame, a cross bar installed on the support rod, the cross bar can rotate around the support rod and swing up and down, a first pull rope is provided at one end of the cross bar, and a second pull rope is provided at the other end; a detector is installed at the end of the cross bar away from the first pull rope. The inspector does not need to use tools, and can directly adjust the position and angle of the cross bar by controlling the first pull rope and the second pull rope, so that it can be located at the left arch waist, right arch waist, left arch top, right arch top or arch top to be detected, ensuring the safety of the detection and solving the installation hidden danger of the inspector standing on the tool for detection. However, the detector and the cross bar of the support device are fixedly connected and the angle cannot be adjusted. If it is used for detection using an acoustic emission sensor, it is difficult to make the probe of the acoustic emission sensor fit the inner side of the tunnel to be detected, which is easy to cause low detection accuracy.

[0004] Therefore, how to make the detection probe of the acoustic emission sensor fit closely with the inner side of the tunnel to be detected is one of the problems that urgently need to be solved in this field. Utility Model Content

[0005] The purpose of the utility model is to provide an auxiliary fixing device for tunnel defect detection based on acoustic emission to solve the deficiencies in the prior art. It can conveniently adjust the position of the detection probe of the acoustic emission sensor so that the detection probe fits the inner side of the tunnel to be detected, thereby improving the detection accuracy.

[0006] The utility model provides an auxiliary fixing device based on acoustic emission tunnel defect detection, comprising a cross bar, wherein one end of the cross bar is rotatably connected to a mounting bracket, a box body is rotatably mounted on the mounting bracket, when the cross bar is in a horizontal position, the opening end of the box body faces upward, a detection probe of an acoustic emission detector is mounted in the box body, the detection end of the detection probe is oriented in the same direction as the opening direction of the box body, the detection end of the detection probe protrudes from the opening of the box body, and the rotation centerline of the box body is perpendicular to the cross bar.

[0007] As described above, the auxiliary fixing device based on acoustic emission tunnel defect detection, wherein, optionally, the mounting bracket includes a first support plate, a second support plate and an arc-shaped connecting plate, the first support plate and the second support plate are arranged in parallel, and the two ends of the arc-shaped connecting plate are respectively fixedly connected to the first support plate and the second support plate to form a U-shaped structure, the box body is located between the first support plate and the second support plate, and the arc-shaped connecting plate is rotatably connected to the cross bar on the side away from the box body.

[0008] As described above, in the auxiliary fixing device based on acoustic emission tunnel defect detection, optionally, two opposite sides of the box body are rotatably connected to the first support plate and the second support plate on the corresponding sides respectively.

[0009] As described above, the auxiliary fixing device based on acoustic emission tunnel defect detection, wherein, optionally, a counterweight limit block is fixedly installed on one side of the box body close to the arc-shaped connecting plate, and a first limit plate is provided at the lower end of the side of the arc-shaped connecting plate close to the box body; when the cross bar is in a horizontal position, the counterweight limit block abuts against the first limit plate.

[0010] As described above, the auxiliary fixing device based on acoustic emission tunnel defect detection, wherein, optionally, a second limiting plate is further provided between the first support plate and the second support plate, and the second limiting plate is located below the box body and at an end away from the arc-shaped connecting plate.

[0011] As described above, in the auxiliary fixing device based on acoustic emission tunnel defect detection, optionally, the detection probe is fixedly installed in the box body and is located between the rotation center line of the box body and the arc-shaped connecting plate.

[0012] As described above, the auxiliary fixing device based on acoustic emission tunnel defect detection, wherein, optionally, a connecting rod is fixedly installed on one end of the arc-shaped connecting plate close to the cross bar, a bearing is sleeved on the connecting rod, and a receiving groove for receiving the bearing is provided on one side of the cross bar close to the arc-shaped connecting plate, and the connecting rod is rotatably connected to the cross bar through the bearing.

[0013] As described above, in the auxiliary fixing device based on acoustic emission tunnel defect detection, optionally, a limiting strip is provided on the arc-shaped connecting plate, and a limiting groove matching with the limiting strip is provided on the cross bar.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. When the utility model detects the inner side of the tunnel, the detection probe of the acoustic emission sensor can be made to fit the inner side of the tunnel to be detected, thereby improving the detection accuracy.

[0016] 2. The utility model arranges a counterweight limit block on one side of the box body close to the arc-shaped connecting plate, thereby ensuring that the end of the box body away from the arc-shaped mounting connecting plate is in a tilted state when the cross bar is in a horizontal position. In this way, when in use, the tilted end of the box body can first contact the inner wall of the tunnel, and by further moving the cross bar, the detection probe installed on the box body is made to rest against the inner wall of the tunnel, thereby preventing the detection probe from contacting the inner wall first, and damaging the detection probe in the process of moving the cross bar to make the detection probe completely contact with the inner wall.

[0017] 3. The utility model designs the mounting bracket and the crossbar to be rotatably connected, thereby making it easier to fit the detection probe to the inner side surface of the tunnel to be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of an auxiliary fixing device based on acoustic emission tunnel defect detection proposed by the utility model;

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure from another perspective;

[0020] Figure 3 Schematic diagram of the installation structure of the mounting bracket, the box body and the connecting rod;

[0021] Figure 4 yes Figure 3 Schematic diagram of the structure from another perspective;

[0022] Figure 5 yes Figure 3 Main view:

[0023] Figure 6 It is a schematic diagram of the structure of the box.

[0024] Description of reference numerals:

[0025] 1-cross bar, 2-mounting bracket, 3-box body, 201-first support plate, 202-second support plate, 203-arc connecting plate, 4-counterweight limit block, 5-first limit plate, 6-second limit plate, 7-connecting rod, 8-bearing, 9-limiting bar, 101-limiting groove, 10-rotating shaft. DETAILED DESCRIPTION

[0026] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] Embodiments of the present utility model: Figure 1-Figure 6 As shown, an auxiliary fixing device based on acoustic emission tunnel defect detection includes a crossbar 1. The auxiliary fixing device proposed in the utility model is used in conjunction with the patent No. 202220756018.4 mentioned in the background technology. Therefore, the crossbar here is the same as the crossbar in the patent mentioned in the background technology. One end of the crossbar 1 is rotatably connected to a mounting bracket 2, and a box body 3 is rotatably mounted on the mounting bracket 2. The rotation centerline of the box body 3 is perpendicular to the crossbar 1. When the crossbar 1 is in a horizontal position, the opening end of the box body 3 is upward, and a mounting hole for mounting the detection probe of the acoustic emission detector is provided in the box body 3. Specifically, the mounting hole can be provided at the bottom of the box body 3 or on the side wall of the box body 3. When the detection probe of the acoustic emission detector is installed in the box body 3, the detection end of the detection probe is oriented in the same direction as the opening direction of the box body 3, and the detection end of the detection probe protrudes from the opening of the box body 3. In this way, it is convenient to adjust the angle between the box body 3 and the mounting bracket 2 so that the detection end of the detection probe fits on the inner side of the tunnel to be detected. In specific implementation, the height of the detection end of the detection probe above the box body 3 is controlled to be 2-10mm. In specific implementation, in order to ensure that the opening of the box body 3 faces upward when the cross bar 1 is in a horizontal state, the cross bar 1 should be connected to the upper middle part of the box body 3 to ensure that the center of gravity of the box body 3 is located below the extension line of the cross bar 1. Under the action of gravity, when the cross bar 1 is in a horizontal state, the box body 3 can keep its opening facing upward.

[0028] Further, the mounting bracket 2 includes a first support plate 201, a second support plate 202 and an arc-shaped connecting plate 203, the first support plate 201 and the second support plate 202 are arranged in parallel, and the two ends of the arc-shaped connecting plate 203 are respectively fixedly connected to the first support plate 201 and the second support plate 202 to form a U-shaped structure. In a specific implementation, the first support plate 201, the second support plate 202 and the arc-shaped connecting plate 203 can be integrally formed. The box body 3 is rotatably mounted between the first support plate 201 and the second support plate 202, and the side of the arc-shaped connecting plate 203 away from the box body 3 is rotatably connected to the cross bar 1. In a specific implementation, the rotation center line of the box body 3 and the first support plate 201, and the rotation center line of the box body 3 and the second support plate 202 are located on the same straight line.

[0029] Preferably, a rotating shaft 10 is fixedly installed on two opposite sides of the box body 3, and the two rotating shafts 10 are rotatably connected to the first support plate 201 and the second support plate 202 on the corresponding sides, respectively. The center lines of the two rotating shafts 10 are located on the same straight line and are perpendicular to the crossbar 1. The two rotating shafts 10 are arranged at one end of the box body 3 away from the arc-shaped connecting plate 203, and are located near the opening of the box body 3. In this way, the end of the box body 3 close to the arc-shaped connecting plate 203 can be moved downward, and the end away from the arc-shaped connecting plate 203 can be tilted. When the tunnel is detected, the tilted end of the box body 3 can first contact the inner wall of the tunnel, and then the detection probe is attached to the inner wall of the tunnel by adjusting the angle between the box body 3 and the mounting bracket 2. In order to avoid damage to the inner wall of the tunnel when the tilted end of the box body 3 contacts the inner wall of the tunnel, the box mouth of the tilted end of the box body 3 can be set to an arc chamfer.

[0030] In order to further ensure that one end of the box body 3 is tilted away from the arc-shaped connecting plate 203, a counterweight limit block 4 can be fixedly installed on the side of the box body 3 close to the arc-shaped connecting plate 203, and a first limit plate 5 is provided at the lower end of the side of the arc-shaped connecting plate 203 close to the box body 3; when the cross bar 1 is in a horizontal position, the counterweight limit block 4 abuts against the first limit plate 5.

[0031] A second limiting plate 6 is further provided between the first supporting plate 201 and the second supporting plate 202. The second limiting plate 6 is located below the box body 3 and at one end away from the arc-shaped connecting plate 203. By providing the first limiting plate 5 and the second limiting plate 6, the maximum rotation angle of the box body 3 can be limited, so as to prevent the box body 3 from turning over too much during use, which is conducive to ensuring that when the cross bar 1 is in a horizontal state, the opening of the box body 3 is tilted upward.

[0032] Preferably, without setting a counterweight limit block 4, the detection probe can also be fixedly installed in the box body 3 between the rotation center line of the box body 3 and the arc-shaped connecting plate 203, and the weight of the detection probe itself can be used to make one end of the box body 3 away from the arc-shaped connecting plate 203 tilt. Here, the first limit plate 5 and the second limit plate 6 still need to be set to limit the box body 3.

[0033] During use, in order to make it easier for the detection probe installed on the box body 3 to be adjusted to fit the inner wall of the tunnel, the mounting bracket 2 and the crossbar 1 can be set to be rotatably connected, and the rotation center line coincides with the center line of the crossbar 1. Specifically, the crossbar 1 can be rotatably connected to the arc-shaped connecting plate 203. The connection between the mounting bracket 2 and the crossbar 1 is located on the side of the arc-shaped connecting plate 203 away from the first limiting plate 5.

[0034] As a preferred embodiment, a connecting rod 7 is fixedly mounted on one end of the arc-shaped connecting plate 203 close to the cross bar 1, a bearing 8 is sleeved on the connecting rod 7, a receiving groove for receiving the bearing 8 is provided on the side of the cross bar 1 close to the arc-shaped connecting plate 203, and the connecting rod 7 is rotatably connected to the cross bar 1 through the bearing 8. In order to prevent the mounting bracket 2 from rotating too much around the cross bar 1, a limit strip 9 may be provided on the arc-shaped connecting plate 203, and a limit slot 101 matching the limit strip 9 may be provided on the cross bar 1. Specifically, the rotation angle of the mounting bracket 2 along the cross bar 1 is between 0-120°. When the cross bar 1 is in a horizontal position, the limit strip 9 is located exactly in the middle of the limit slot 101, so that it can be ensured that the maximum angle of rotation of the mounting bracket 2 left and right along the cross bar 1 is the same.

[0035] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above are only preferred embodiments of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. An auxiliary fixing device for tunnel defect detection based on acoustic emission, comprising a crossbar (1), characterized in that: One end of the cross bar (1) is rotatably connected to a mounting bracket (2), and a box body (3) is rotatably mounted on the mounting bracket (2). When the cross bar (1) is in a horizontal position, the opening end of the box body (3) faces upward, and a detection probe of an acoustic emission detector is mounted in the box body (3). The detection end of the detection probe is oriented in the same direction as the opening of the box body (3), and the detection end of the detection probe protrudes from the opening of the box body (3). The rotation centerline of the box body (3) is perpendicular to the cross bar (1).

2. The auxiliary fixing device based on acoustic emission tunnel defect detection according to claim 1 is characterized in that: The mounting bracket (2) comprises a first support plate (201), a second support plate (202) and an arc-shaped connecting plate (203); the first support plate (201) and the second support plate (202) are arranged in parallel; two ends of the arc-shaped connecting plate (203) are respectively fixedly connected to the first support plate (201) and the second support plate (202) to form a U-shaped structure; the box body (3) is located between the first support plate (201) and the second support plate (202); and the arc-shaped connecting plate (203) is rotatably connected to the cross bar (1) at a side away from the box body (3).

3. The auxiliary fixing device based on acoustic emission tunnel defect detection according to claim 2 is characterized in that: Two opposite sides of the box body (3) are rotatably connected to the first support plate (201) and the second support plate (202) on the corresponding sides respectively.

4. The auxiliary fixing device based on acoustic emission tunnel defect detection according to claim 3 is characterized in that: A counterweight limit block (4) is fixedly mounted on one side of the box body (3) close to the arc-shaped connecting plate (203), and a first limit plate (5) is provided at the lower end of the side of the arc-shaped connecting plate (203) close to the box body (3); when the cross bar (1) is in a horizontal position, the counterweight limit block (4) abuts against the first limit plate (5).

5. The auxiliary fixing device based on acoustic emission tunnel defect detection according to claim 2 is characterized in that: A second limiting plate (6) is further provided between the first supporting plate (201) and the second supporting plate (202), and the second limiting plate (6) is located below the box body (3) and at an end away from the arc-shaped connecting plate (203).

6. The auxiliary fixing device based on acoustic emission tunnel defect detection according to claim 3 is characterized in that: The detection probe is fixedly mounted in the box body (3) and is located between the rotation center line of the box body (3) and the arc-shaped connecting plate (203).

7. The auxiliary fixing device based on acoustic emission tunnel defect detection according to claim 6 is characterized in that: A connecting rod (7) is fixedly mounted on one end of the arc-shaped connecting plate (203) close to the cross bar (1); a bearing (8) is sleeved on the connecting rod (7); a receiving groove for receiving the bearing (8) is provided on one side of the cross bar (1) close to the arc-shaped connecting plate (203); and the connecting rod (7) is rotatably connected to the cross bar (1) via the bearing (8).

8. The auxiliary fixing device based on acoustic emission tunnel defect detection according to claim 7 is characterized in that: The arc-shaped connecting plate (203) is provided with a limiting strip (9), and the cross bar (1) is provided with a limiting groove (101) that matches the limiting strip (9).

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