Knocking device suitable for elastic wave CT detection

Abstract

The utility model discloses a knocking device suitable for elastic wave CT (Computed Tomography) detection, which comprises a rotating middle shaft and supports positioned at two ends of the rotating middle shaft, and the rotating middle shaft is rotationally connected with the supports; a connecting rod penetrates through the center of the rotating center shaft, the connecting rod is perpendicular to the axis of the rotating center shaft, the connecting rod and the rotating center shaft are relatively fixed, and a knocking hammer is fixed to one end of the connecting rod; one end of each torsional spring is fixedly connected with the support, and the other end of each torsional spring is fixedly connected with the rotating middle shaft; a tension digital display dynamometer is fixed on the peripheral surface, close to the knocking hammer, of the connecting rod, and a pull rope is connected to the tension digital display dynamometer. According to the utility model, the knocking force and position are convenient to adjust and control, the consistency of multiple knocking positions and force is ensured, the accuracy and reliability of prestressed duct grouting defect detection are improved, the operation is convenient, and the practicability is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of elastic wave detection, especially to a knocking device suitable for elastic wave CT detection. BACKGROUND

[0002] As a core component in prestressed beam structures, the importance of prestressed ducts is self-evident. The prestress design of steel strands in the duct aims to effectively offset the bridge surface pressure from vehicles and pedestrians, ensuring the stability and safety of the bridge structure. However, the quality problems of prestressed duct grouting, especially the corrosion and fracture of steel strands caused by non-compactness of corrugated pipe grouting, have become a major hidden danger affecting the service life of the bridge.

[0003] In order to accurately detect the defects of prestressed duct grouting, elastic wave CT detection technology has attracted much attention due to its high theoretical feasibility. However, this method requires high accuracy of data, and the accuracy of the first arrival wave arrival time is particularly critical. Due to the difficulty in ensuring the consistency of the position and force of each knock, the traditional manual knocking method often leads to changes in the propagation path of the wave, thereby affecting the accuracy of the first arrival wave arrival time. SUMMARY

[0004] To solve the above technical problems, the utility model provides a knocking device suitable for elastic wave CT detection, which improves the accuracy and reliability of prestressed duct grouting defect detection, ensures the consistency of the position and force of multiple knocks, is easy to operate, and has good practicality.

[0005] To achieve the above purpose, the utility model provides a knocking device suitable for elastic wave CT detection, which comprises a rotating central shaft and a support located at both ends of the rotating central shaft, the rotating central shaft is rotationally connected with the support; a connecting rod is provided through the center of the rotating central shaft, the connecting rod is perpendicular to the axis of the rotating central shaft, the connecting rod is fixed relative to the rotating central shaft, and one end of the connecting rod is fixed with a knocking hammer; a torsional spring is sleeved on the outer circumferential surface of both ends of the rotating central shaft, one end of the torsional spring is fixedly connected with the support, and the other end is fixedly connected with the rotating central shaft; a tension digital force gauge is fixed on the outer circumferential surface of the connecting rod close to the knocking hammer, and a pull rope is connected to the tension digital force gauge.

[0006] Further, coaxially fixed end rods are provided on the end faces of the rotating central shaft, the diameter of the end rods is smaller than the diameter of the rotating central shaft, bearings are sleeved on the end rods, connecting grooves are provided on the support for embedding and installing the bearings, the bearings are embedded and fixed in the connecting grooves, and the outer diameter of the bearings is less than or equal to the outer diameter of the rotating central shaft.

[0007] Further, the center of the rotating middle shaft is provided with a through hole for the connecting rod, the connecting rod is slidably arranged in the through hole, and the rod body of the locking knob is arranged in the rotating middle shaft and abuts against the outer periphery of the connecting rod.

[0008] Further, both ends of the bottom surface of the support are provided with rollers, the roller comprises a wheel seat and a wheel body rotatably connected to the wheel seat, the wheel seat is hinged to the edge of the bottom surface of the support, a hidden groove matched with the roller is arranged on the side wall adjacent to the roller of the support, and the roller can be turned into the hidden groove of the side wall of the support.

[0009] The utility model discloses the beneficial effect:

[0010] The utility model discloses a kind of knocking device suitable for elastic wave CT detection, it is convenient for operator to adjust and control knocking force and position, ensure that each time knocking has same force, to improve the accuracy and repeatability of test result;Solve the first arrival time deviation problem caused by different knocking position and force, can accurately measure first arrival time, provide strong support for the implementation of elastic wave CT detection technology;And with intelligentization, strong adaptability and other characteristics, can satisfy different bridge structure and detection demand. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the overall structure schematic diagram of the utility model.

[0012] Figure 2 It is the explosion drawing of the utility model.

[0013] Figure 3 It is the side view of the utility model.

[0014] In the drawing: 1, rotating middle shaft;11, end rod;12, bearing;13, torsional spring;2, support;21, hidden groove;3, connecting rod;31, locking knob;32, tension digital force gauge;4, knocking hammer;5, roller;6, pull rope. DETAILED DESCRIPTION

[0015] Now the utility model will be further explained in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, just with schematic way to show the basic structure of the utility model, so it only shows the structure related to the utility model.

[0016] The utility model discloses a kind of knocking device suitable for elastic wave CT detection.

[0017] Refer to Figure 1 And Figure 2The utility model provides a kind of knocking device suitable for elastic wave CT detection, including rotating central axis 1 and support 2 located at the both ends of rotating central axis 1, rotating central axis 1 is rotationally connected with support 2;Rotating central axis 1 center is provided with connecting rod 3, connecting rod 3 is perpendicular to the axis of rotating central axis 1, connecting rod 3 is relatively fixed with rotating central axis 1, and one end of connecting rod 3 is fixed with knocking hammer 4;Rotating central axis 1 both ends outer circumferential surface is equipped with torsion spring 13, one end of torsion spring 13 is fixedly connected with support 2, and the other end is fixedly connected with rotating central axis 1;Connecting rod 3 is fixed on the outer circumferential surface close to knocking hammer 4 with tension digital force gauge 32, and tension digital force gauge 32 is connected with pull rope 6.

[0018] Referring to Figure 1 And Figure 2 When carrying out the knocking work of elastic wave CT detection, after the knocking device is moved to the required position, connecting rod 3 and the knocking hammer 4 thereon are deflected away from the knocking point by pulling pull rope 6, at this time, torsion spring 13 on rotating central axis 1 is deformed under the torsional action force, and the tension digital force gauge 32 displays the size of the applied tension, when reaching the required value, the pull rope 6 is loosened, and connecting rod 3 and the knocking hammer 4 thereon are rotated under the torsional action force of torsion spring 13, so as to knock on the required position and excite elastic wave; The structure design is convenient for the operator to adjust and control the knocking force, ensures that each time of knocking has the same force, so as to improve the accuracy and repeatability of the test results.

[0019] Referring to Figure 1 And Figure 2 The end rod 11 is coaxially fixed on the end surface of the rotating central axis 1, the diameter of the end rod 11 is smaller than the diameter of the rotating central axis 1, the end rod 11 is sleeved with the bearing 12, the support 2 is provided with the connecting groove for embedding and installing the bearing 12, the bearing 12 is embedded and fixed in the connecting groove, and the outer diameter of the bearing 12 is less than or equal to the outer diameter size of the rotating central axis 1. The design of the bearing 12 ensures the rotation effect of the rotating central axis 1 and the support 2; the design that the outer diameter of the bearing 12 is less than the outer diameter size of the rotating central axis 1 provides space for the connection of the torsion spring 13 and the support 2, so as to avoid the interference between the torsion spring 13 and the bearing 12.

[0020] Referring to Figure 1 And Figure 2 A through hole is provided in the center of the rotating central axis 1 for the sliding of the connecting rod 3, the connecting rod 3 is slidably arranged in the through hole, and the locking knob 31 is threadedly connected to the outer circumferential surface of the rotating central axis 1, the rod body of the locking knob 31 is arranged in the rotating central axis 1 and abuts against the outer circumferential surface of the connecting rod 3. The design of the locking knob 31 ensures the firmness of the connection between the connecting rod 3 and the rotating central axis 1, prevents the sliding of the connecting rod 3 during knocking, and improves the flexibility of adjusting the knocking position.

[0021] Referring to Figure 2 And Figure 3The bottom surface of the support 2 is provided with a roller 5 at both ends, the roller 5 comprising a wheel body and a wheel seat, the wheel seat being hinged to the bottom surface of the support 2, a hidden groove 21 being formed in the side wall of the support 2 adjacent to the roller 5 and being matched with the roller 5, and the roller 5 being capable of being turned into the hidden groove 21 of the side wall of the support 2; and the bottom surface of the support 2 and the inner wall of the hidden groove 21 are both embedded with magnetic blocks capable of attracting the wheel seat. The design not only facilitates the movement of the knocking device, but also hides the roller 5 during the test, so as to avoid the potential influence of rolling or sliding during the knocking on the test result, and further improve the stability and reliability of the test; and the magnetic blocks are used for attracting and fixing the roller 5, so as to ensure the stability of the position.

[0022] The working principle of the knocking device suitable for elastic wave CT detection is as follows: during the detection, first, the to-be-detected member and the position of the measurement line are determined, the to-be-detected area is polished flat and smooth by using sandpaper, and then a marker pen is used to draw a measurement line mark to provide a guide for subsequent operation. Then, the locking knob 31 on the tension knocking device is loosened, and the position of the knocking hammer 4 on the connecting rod 3 is adjusted. Then, the knocking device is moved to the approximate position, and the roller 5 is turned and hidden; then, the knocking hammer 4 is connected to the corresponding interface of the concrete multifunctional detector by using the BNC connecting line for signal transmission. Then, the detection can be carried out, the rotating track of the knocking hammer 4 is ensured to coincide with the measurement line and correspond to the first measurement point; the continuous acquisition function of the detector is started by clicking, then the fixed support 2 is pressed, the knocking hammer 4 is lifted by pulling the pull rope 6, the pulling force is observed by the tension digital force gauge 32, the pull rope 6 is loosened, and the knocking hammer 4 is rotated to accurately knock on the first measurement point to excite the elastic wave, and the related data is collected. The above operation is repeated until all the preset measurement points are detected by knocking. The knocking device effectively improves the accuracy and reliability of the prestressed duct grouting defect detection. By ensuring the consistency of the knocking position and the force, the device can accurately measure the first arrival time, and provides strong support for the implementation of the elastic wave CT detection technology. In addition, the device also has the characteristics of intelligence and strong adaptability, and can meet the detection needs of different bridge structures.

[0023] Based on the above ideal embodiments of the present application, the related personnel can make various changes and modifications without deviating from the technical concept of the present application. The technical scope of the present application is not limited to the contents in the specification, and must be determined according to the scope of the claims.

Claims

1. A tapping device suitable for use in elastic wave CT detection, characterized by: The utility model provides a kind of percussion hammer, including rotating central axis (1) and support (2) at both ends of rotating central axis (1), rotating central axis (1) is rotatably connected with support (2);Connecting rod (3) is provided in the center of rotating central axis (1), the axis of connecting rod (3) is perpendicular to rotating central axis (1), connecting rod (3) is opposite fixed with rotating central axis (1), one end of connecting rod (3) is fixed with knock hammer (4);Rotating central axis (1) both ends outer circumferential surface is equipped with torsion spring (13), one end of torsion spring (13) is fixedly connected with support (2), and the other end is fixedly connected with rotating central axis (1);Tension digital force gauge (32) is fixed on the outer circumferential surface of connecting rod (3) close to knock hammer (4), and pull rope (6) is connected on tension digital force gauge (32).

2. A tapping device suitable for use in elastic wave CT detection according to claim 1, characterized in that: The both ends of the rotating central axis (1) are coaxially fixed with end rod (11), the diameter of the end rod (11) is less than the diameter of the rotating central axis (1), the end rod (11) is equipped with bearing (12), the support (2) is provided with connecting groove for embedding and installing the bearing (12), the bearing (12) is embedded and fixed in the connecting groove, and the outer diameter of the bearing (12) is less than or equal to the outer diameter of the rotating central axis (1).

3. A tapping device suitable for use in elastic wave CT detection according to claim 2, characterized in that: The center of the rotating central axis (1) is provided with a through hole for the connecting rod (3) to pass through, the connecting rod (3) is slidably embedded in the through hole, and the outer circumferential surface of the rotating central axis (1) is threadedly connected with a locking knob (31), the rod body of the locking knob (31) is embedded in the rotating central axis (1) and abuts against the outer circumferential surface of the connecting rod (3).

4. A tapping device suitable for use in elastic wave CT detection according to claim 3, characterized in that: The bottom of the support (2) is provided with a roller (5), the roller (5) includes a wheel seat and a wheel body rotatably connected to the wheel seat, the wheel seat is hingedly connected to the edge of the bottom of the support (2), the side wall adjacent to the support (2) is provided with a hidden groove (21) matched with the roller (5), and the roller (5) can be turned into the hidden groove (21) of the side wall of the support (2); The bottom of the support (2) and the inner wall of the hidden groove (21) are embedded with magnetic blocks that can adsorb the wheel seat.

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