CN217180721U

CN217180721U - Exciter and detection device for detecting internal defects of concrete by adopting elastic wave CT method

Info

Publication number: CN217180721U
Application number: CN202220787835.6U
Authority: CN
Inventors: 朱纪刚; 姚鑫; 马坤; 雷彤彤
Original assignee: Sichuan Lutong Detection Technology Co ltd
Current assignee: Sichuan Lutong Detection Technology Co ltd
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2022-08-12
Anticipated expiration: 2032-04-07

Abstract

The utility model discloses an adopt elastic wave CT method to detect exciter and detection device of concrete internal defect. According to the first aspect, the exciter for detecting the internal defects of the concrete by adopting the elastic wave CT method comprises an exciter adjusting rod, wherein an exciting hammer is arranged at one end of the exciter adjusting rod, the exciting hammer is connected with an acceleration sensor, an exciting mechanism is arranged between the exciting hammer and a trigger adjusting rod, an exciting controller is arranged on the exciter adjusting rod, and a signal transmitting device is arranged on the exciter adjusting rod. In a second aspect, the detection device for detecting the internal defects of the concrete by adopting the elastic wave CT method comprises a signal receiver, wherein the signal receiver and the elastic wave CT exciter are arranged on two opposite sides of the concrete when in use, the signal receiver comprises a receiving end adjusting rod, at least one receiving end acceleration sensor is arranged on the receiving end adjusting rod, and a receiving end signal transmitting device is arranged on the receiving end adjusting rod. The utility model discloses its simple structure conveniently adapts to the different operating condition in scene, and the security is strong.

Description

Exciter and detection device for detecting internal defects of concrete by adopting elastic wave CT method

Technical Field

The utility model relates to a civil engineering nondestructive test technical field, concretely relates to adopt elastic wave CT method to detect exciter and detection device of concrete internal defect.

Background

In the concrete internal defect detection, an impact elastic wave is usually adopted as a medium, the wave velocity and the signal amplitude are used as calculation bases, an object to be detected is scanned in an all-around manner through a cross survey line, and a structural mass distribution image which can truly reflect the internal condition of the structure is obtained through inversion and reconstruction of collected data, so that the purpose of detecting the internal quality of the structure is achieved.

In the field data acquisition process, the operation conditions of partial areas are poor, and personnel cannot reach the detection operation area, so that the engineering quality of the area cannot be evaluated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an adopt elastic wave CT method to detect exciter and detection device of concrete internal defect, its simple structure conveniently adapts to the different operating condition in scene, and the security is strong.

In order to solve the technical problem, the utility model discloses a following scheme:

on the first hand, the exciter for detecting the internal defects of the concrete by adopting the elastic wave CT method comprises an exciter adjusting rod, wherein one end of the exciter adjusting rod is provided with an exciting hammer, the exciting hammer is connected with an acceleration sensor, an exciting mechanism for driving the exciting hammer to strike the surface of the concrete is arranged between the exciting hammer and the exciter adjusting rod, the exciter adjusting rod is provided with an exciting controller for controlling the exciting mechanism to strike the surface of the concrete, the exciter adjusting rod is provided with a signal transmitting device for transmitting an elastic wave signal generated by striking the surface of the concrete by exciting hammer to an instrument host, the exciter also comprises a power module, the control method of the exciting controller comprises electric signal transmission control or mechanical transmission control, such as a gear, a worm and a conveyor belt mechanism, when the exciting controller adopts the electric signal transmission control, the exciting controller is electrically connected with the power module, and a control cable is connected between the exciting controller and the exciting mechanism, the excitation mechanism is internally provided with a driving device, the driving device adopts a motor or a cylinder, and a control cable is connected with a control switch of the motor or the cylinder. The device has the effects that the excitation controller is operated to control the excitation mechanism to drive the excitation hammer to strike the surface of the concrete to be tested to generate an elastic wave signal, and the acceleration sensor is used for collecting the signal of the striking end and then sending the signal to the instrument host through the signal transmitting device.

Furthermore, an adjusting mechanism used for adjusting the angle between the excitation mechanism and the exciter adjusting rod is arranged between the exciter adjusting rod and the excitation mechanism. The adjusting mechanism comprises a ratchet mechanism which is used for adjusting the angle through clamping and locking or a bolt which is used for increasing the friction force between connecting pieces for locking. The acceleration sensor has the function that the acceleration sensor can adjust the angle between the excitation mechanism and the exciter adjusting rod according to different field conditions.

Further, the driving device of the excitation mechanism adopts any one or more of a spring, an air cylinder or a motor.

Further, the excitation mechanism comprises a spring, and the spring is connected with the vibration hammer or the acceleration sensor. The concrete surface is beaten by vibration and hammering when the energy is stored through the spring.

Furthermore, the excitation mechanism comprises an air cylinder, an expansion link of the air cylinder is connected with or corresponds to the exciting hammer, when the air cylinder is connected with the exciting hammer, the air cylinder pushes the exciting hammering to strike the concrete surface and pulls the exciting hammer to reset, when the air cylinder corresponds to the exciting hammer, the excitation mechanism further comprises a reset spring for resetting the exciting hammer, and after the expansion link of the air cylinder pushes the exciting hammering to strike the concrete surface, the reset spring is used for resetting the exciting hammer. The vibration exciting hammering concrete surface beating machine has the effect that the vibration exciting hammering concrete surface beating machine is pushed by the air cylinder.

Furthermore, the excitation mechanism comprises a motor, the output end of the motor is connected with a crank-link mechanism, one end of the connecting rod, which is far away from the motor, is connected with or corresponds to the exciting hammer, when the connecting rod is connected with the exciting hammer, the exciting hammer is pushed to excite the concrete surface to be beaten and the exciting hammer is pulled to reset through the connecting rod, when the connecting rod corresponds to the exciting hammer, one end of the connecting rod is connected with a piston which can be contacted with the exciting hammer, and the exciting hammer is pushed to beat through the piston to reset through a reset spring after the concrete surface is beaten. When one end far away from the motor corresponds to the exciting hammer, the exciting mechanism further comprises a return spring for returning the exciting hammer. The impact hammer is driven by the motor to vibrate and hammer a concrete surface.

Furthermore, the signal transmitting device comprises a BNC signal interface, a signal transmitter and a transmitting antenna, and a low-noise shielding cable is connected between the BNC signal interface and the acceleration sensor.

In a second aspect, a detection device for detecting internal defects of concrete by adopting an elastic wave CT method comprises a signal receiver, wherein the signal receiver and the exciter for detecting internal defects of concrete by adopting an elastic wave CT method are arranged on two opposite sides of the concrete when in use, the signal receiver comprises a receiving end adjusting rod, at least one receiving end acceleration sensor is arranged on the receiving end adjusting rod, and a receiving end signal transmitting device is arranged on the receiving end adjusting rod. The device has the effects that elastic wave signals generated by hammering the concrete surface by exciting vibration are collected at one side of the concrete opposite to the exciting vibration hammer through the receiving end acceleration sensor, and then the signals are sent to the instrument host through the receiving end signal transmitting device.

Furthermore, at least two receiving end acceleration sensors are arranged on the receiving end adjusting rod, a width adjusting rod is arranged on the receiving end adjusting rod, the receiving end acceleration sensors are arranged on the width adjusting rod, and the width adjusting rod is provided with scales and a clamping groove for mounting the receiving end acceleration sensors. The effect of the device is that the distance between the acceleration sensors at the receiving end can be adjusted according to the actual situation on site by arranging the width adjusting rod.

Furthermore, a receiving end adjusting mechanism for adjusting the angle between the receiving end adjusting rod and the width adjusting rod is arranged between the receiving end adjusting rod and the width adjusting rod, and both the exciter adjusting rod and the receiving end adjusting rod can contract and extend. The length of the exciter adjusting rod and the length of the receiving end adjusting rod and the angle between the receiving end adjusting rod and the width adjusting rod can be adjusted according to actual conditions on site.

The utility model discloses beneficial effect who has:

1. the utility model provides a signal receiver simple structure, easily preparation, used material quality is light.

2. The utility model discloses an adjustable regulation pole for acceleration sensor can carry out the adjustment of level and length and angle according to site conditions's difference, has made things convenient for the different operating condition in adaptation scene.

3. The utility model provides an exciter adopts excitation controller control excitation hammer to strike, can effectively solve the problem that the personnel can not reach.

4. The utility model provides a signal emission device can effectively solve wired transmission's drawback with elastic wave signal wireless transmission to ground instrument host computer of gathering.

5. By adopting the detection device, the problems that no operation surface (such as scenes of high altitude, underwater and the like) exists in a part of areas, the danger coefficient is high and the like can be effectively solved.

Drawings

Fig. 1 is a schematic view of the detection principle of the present invention;

FIG. 2 is a schematic structural view of an exciter for detecting internal defects of concrete according to example 1 by an elastic wave CT method;

FIG. 3 is a schematic structural view of an adjusting mechanism in embodiment 1;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 2;

FIG. 5 is a schematic diagram of a signal receiver;

FIG. 6 is a schematic diagram of electrical connections between a power module, a driving device, and an excitation controller;

FIG. 7 is a schematic diagram of signal transmission among the acceleration sensor, the signal emitting device and the instrument host;

FIG. 8 is a schematic structural view of an exciter for detecting internal defects of concrete according to example 2 by an elastic wave CT method;

FIG. 9 is a schematic structural view of an exciter for detecting internal defects of concrete according to example 3 by an elastic wave CT method;

FIG. 10 is an enlarged schematic view of the piston moving backward by the connecting rod at B in FIG. 9;

FIG. 11 is an enlarged schematic structural view of the piston driven by the connecting rod at B in FIG. 9 to move toward the exciting hammer;

fig. 12 is an enlarged schematic structural diagram of the case where the connecting rod at B in fig. 9 drives the piston to push the exciting hammer to move.

The reference numerals are explained below: 1. an exciter adjusting rod; 2. a vibration hammer is excited; 3. an acceleration sensor; 4. an excitation mechanism; 5. an excitation controller; 6. a signal transmitting device; 7. an adjustment mechanism; 8. a spring; 9. a cylinder; 10. a motor; 11. a return spring; 12. a low noise shielded cable; 13. a signal receiver; 14. a receiving end adjusting rod; 15. receiving an acceleration sensor; 16. a receiving end signal transmitting device; 17. a width adjusting rod; 18. calibration; 19. a card slot; 20. a receiving end adjusting mechanism; 21. a concrete excitation end to be detected; 22. a control cable; 23. an instrument host; 24. a ratchet wheel; 25. a rotating shaft; 26. a pawl; 27; a spring plate; 28. a boss portion; 29. a disc; 30. a force receiving portion; 31. a cavity; 32. a connecting rod; 33. a piston; 34. a power supply module; 35. a drive device.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and the terms are only for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be further noted that, unless otherwise explicitly specified or limited, the terms "disposed," "opened," "mounted," "connected," and "connected" are to be construed broadly, e.g., as either a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

On the first hand, as shown in fig. 2, an exciter for detecting internal defects of concrete by using an elastic wave CT method comprises an exciter adjusting rod 1, wherein one end of the exciter adjusting rod 1 is provided with an exciting hammer 2, the exciting hammer 2 is connected with an acceleration sensor 3, the acceleration sensor 3 is in threaded connection with the exciting hammer 2, an exciting mechanism 4 for driving the exciting hammer 2 to strike the surface of the concrete is arranged between the exciting hammer 2 and the exciter adjusting rod 1, the exciter adjusting rod 1 is provided with an excitation controller 5 for controlling the exciting mechanism 4 to strike the surface of the concrete, the exciter adjusting rod 1 is provided with a signal transmitting device 6 for transmitting an elastic wave signal generated by the exciting hammer 2 striking the surface of the concrete to an instrument host 23, the exciter further comprises a power module 34, the control method of the excitation controller 5 adopts electric signal transmission control, and the excitation controller 5 is electrically connected with the power module 34, a control cable 22 is connected between the excitation controller 5 and the excitation mechanism 4, a driving device 35 is arranged in the excitation mechanism 4, the driving device 35 adopts a motor 10, and the control cable 22 is connected with the motor 10. The device has the effects that the excitation controller 5 is operated to control the excitation mechanism 4 to drive the excitation hammer 2 to strike the surface of the concrete to be tested so as to generate an elastic wave signal, and the acceleration sensor 3 is used for collecting a signal of a striking end and then sending the signal to the instrument host 23 through the signal transmitting device 6.

Specifically, as shown in fig. 2, an adjusting mechanism 7 for adjusting an angle between the exciter adjusting lever 1 and the exciter adjusting lever 4 is provided between the exciter adjusting lever 1 and the exciter adjusting lever 4.

Specifically, as shown in fig. 3, the adjusting mechanism 7 adopts a ratchet 24 mechanism to adjust the angle by clamping and locking, the adjusting mechanism 7 comprises a ratchet 24, a rotating shaft 25 with a strip-shaped cross section is connected to the center of the ratchet 24, the rotating shaft 25 is arranged on the excitation mechanism 4, a pawl 26 is meshed outside the ratchet 24, the side wall of the pawl 26 is in contact with a spring piece 27, one end of the pawl 26, which is far away from the ratchet 24, is arranged outside the adjusting mechanism 7, the rotating angle of the excitation mechanism 4 relative to the exciter adjusting rod 1 is fixed by clamping the pawl 26 with the ratchet 24, and the ratchet 24 can rotate clockwise by swinging the pawl 26. The acceleration sensor 3 can adjust the angle between the excitation mechanism 4 and the exciter adjusting rod 1 according to different field conditions.

Specifically, as shown in fig. 4, the driving device of the excitation mechanism 4 employs a spring 8.

Specifically, as shown in fig. 4, the exciting mechanism 4 includes a spring 8, the spring 8 is used for pushing the exciting hammer 2 to strike the concrete surface when the length of the exciting hammer is restored by releasing energy after energy storage, and the spring 8 is connected with the exciting hammer 2. By arranging the disc 29 with the protruding part 28 on the side wall, the disc 29 is driven by a motor (the view angle is not shown in the figure) to rotate, the motor controls the rotation through a control cable 22 connected with the excitation controller 5, the tail end of the hammer handle of the excitation hammer 2 is provided with a stress part 30 with the outer diameter larger than that of the hammer handle, a cavity 31 for the stress part 30 to move along the advancing direction of the excitation hammer 2 is arranged in the excitation mechanism 4, a through hole for the protruding part 28 of the disc 29 to pass through during rotation is arranged on the cavity 31, the protruding part 28 can push the top end of the stress part 30 of the hammer handle of the excitation hammer 2 to move towards the extrusion spring 8 during counterclockwise rotation of the disc 29, when the disc 29 is continuously rotated along the counterclockwise direction, the protruding part 28 moves out of the cavity 31, the spring 8 can push the bottom end of the stress part 30 of the hammer handle to enable the excitation hammer 2 to strike the concrete surface through the energy storage before releasing. The effect is that the vibration exciter 2 strikes the concrete surface when the spring 8 is used for energy storage.

Specifically, the signal transmitting device 6 includes a BNC signal interface, a signal transmitter, and a transmitting antenna, and a low-noise shielded cable 12 is connected between the BNC signal interface and the acceleration sensor 3.

In a second aspect, as shown in fig. 5, a device for detecting internal defects of concrete by using an elastic wave CT method includes a signal receiver 13, where the signal receiver 13 and the above exciter for detecting internal defects of concrete by using an elastic wave CT method are disposed on opposite sides of concrete when in use, the signal receiver 13 includes a receiving end adjusting lever 14, at least one receiving end acceleration sensor 15 is disposed on the receiving end adjusting lever 14, and a receiving end signal emitting device 16 is disposed on the receiving end adjusting lever 14. The effect of the device is that an elastic wave signal generated when the vibration hammer 2 strikes the concrete surface is collected at one side of the concrete opposite to the vibration hammer 2 through the receiving end acceleration sensor 15, and then the signal is sent to the instrument host 23 through the receiving end signal transmitting device 16.

Specifically, as shown in fig. 5, at least two receiving end acceleration sensors 15 are arranged on the receiving end adjusting rod 14, a width adjusting rod 17 is arranged on the receiving end adjusting rod 14, the receiving end acceleration sensors 15 are arranged on the width adjusting rod 17, and scales 18 and a clamping groove 19 for mounting the receiving end acceleration sensors 15 are arranged on the width adjusting rod 17. The function of the device is that the distance between the acceleration sensors 15 at the receiving end can be adjusted according to the actual situation on site by arranging the width adjusting rod 17.

Specifically, as shown in fig. 3 and 5, a receiving end adjusting mechanism 20 for adjusting an angle between the receiving end adjusting lever 14 and the width adjusting lever 17 is provided between the receiving end adjusting lever 14 and the width adjusting lever 17, and both the exciter adjusting lever 1 and the receiving end adjusting lever 14 can be contracted and extended. The length of the exciter adjusting rod 1 and the receiving end adjusting rod 14 and the angle between the receiving end adjusting rod 14 and the width adjusting rod 17 can be adjusted according to actual conditions on site.

The working principle of the embodiment is explained as follows:

as shown in fig. 6, the power module 34 is used for supplying power to the driving device 35, and the excitation controller 5 is used for controlling the on/off of the driving device 35;

as shown in fig. 1, firstly, adjusting the adjusting rod to a proper angle according to the condition of the detection area to ensure that the acceleration sensor 3 on the exciter is well coupled with the surface of the concrete, the acceleration sensor 3 in the exciter is connected with the vibration hammer 2 through a connecting screw, the vibration hammer 2 is placed above the excitation end 21 of the concrete to be detected, the excitation controller 5 controls the excitation mechanism 4 to drive the vibration hammer 2 to knock the surface of the concrete to generate an elastic wave signal, as shown in fig. 7, the acceleration sensor 3 connected with the vibration hammer 2 sends the collected signal to the instrument host 23 through the signal transmitting device 6, the receiving end acceleration sensor 15 on the signal receiver 13 opposite to the concrete also sends the collected signal to the instrument host 23 through the receiving end signal transmitting device 16, and by calculating the wave velocity and the energy of a plurality of received signals, and whether the interior of the concrete has defects or not and the coordinates of the positions of the defects can be quickly judged.

Example 2

As shown in fig. 8, the driving device of the excitation mechanism 4 adopts a cylinder 9, the driving device adopts a cylinder, and a control cable is connected with a control switch of the cylinder.

Specifically, as shown in fig. 8, the excitation mechanism 4 includes a cylinder 9, and the cylinder 9 is connected to the acceleration sensor 3. The telescopic link of cylinder 9 is connected with acceleration sensor 3, and the acceleration sensor 3 other end is connected with exciting hammer 2, and cylinder 9 controls the start-up through excitation controller 5, starts behind the cylinder 9 and promotes acceleration sensor 3 by the telescopic link and then promotes exciting hammer 2 and hit the concrete face. The effect is that the cylinder 9 is used for pushing the vibration hammer 2 to strike the concrete surface.

The rest of the structure and the operation principle are the same as those of the embodiment 1.

Example 3

As shown in fig. 9, the driving means of the excitation mechanism 4 employs a motor 10.

Specifically, as shown in fig. 9, the excitation mechanism 4 includes a motor 10, an output end of the motor 10 is connected with a crank-link 32 mechanism, one end of the link 32 away from the motor 10 corresponds to the exciting hammer 2, and the excitation mechanism 4 further includes a return spring 11 for returning the exciting hammer 2. The motor 10 is electrically connected with the excitation controller 5, after the motor 10 is started through the excitation controller 5, the output end of the motor 10 drives the connected rotary table to rotate, the tail end of a connecting rod 32 connected to the non-circle center of the rotary table is connected with a piston 33 used for striking the bottom end of the hammer handle of the excitation hammer 2, and the piston 33 is connected to a piston 33 frame of a cavity 31 in the excitation mechanism 4. As shown in fig. 10, when the end of the connecting rod 32 remote from the hammer 2 is rotated to the farthest position from the hammer 2, the piston 33 is located at the farthest position from the hammer 2; as shown in fig. 11, when the link 32 is located between the farthest position and the closest position from the hammer 2 from the end of the hammer 2 and is rotated toward the hammer 2, the piston 33 moves toward the hammer 2; as shown in fig. 12, when the end of the connecting rod 32 remote from the hammer 2 is rotated to the nearest position from the hammer 2, the piston 33 pushes the hammer 2 forward. The motor 10 is used for driving the vibration hammer 2 to strike the concrete surface.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and the technical essence of the present invention is that within the spirit and principle of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments are all within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides an adopt elastic wave CT method to detect exciter of concrete internal defect, adjusts pole (1) including the exciter, its characterized in that: exciter regulation pole (1) one end is equipped with exciting hammer (2), acceleration sensor (3) that are used for gathering initial signal and send out the time of shaking are installed to exciting hammer (2), exciting hammer (2) and exciter are equipped with between regulation pole (1) and are used for driving exciting mechanism (4) of exciting hammer (2), be equipped with on exciter regulation pole (1) and be used for controlling exciting mechanism (4) and get into operating condition and make exciting hammer (2) hit beat exciting controller (5) of beating concrete surface, be equipped with on exciter regulation pole (1) and be used for beating exciting hammer (2) and hit elastic wave signal transmission to the signal emission device (6) of instrument host computer that concrete surface produced.

2. The exciter according to claim 1, wherein the exciter is used for detecting internal defects of concrete by an elastic wave CT method, and is characterized in that: be equipped with between exciter regulation pole (1) and the excitation mechanism (4) and be used for adjusting the adjustment mechanism (7) of angle between excitation mechanism (4) and exciter regulation pole (1), adjustment mechanism (7) are locked through the joint through ratchet and are come angle regulation or adopt the bolt increase frictional force between the connecting piece to lock and come angle regulation.

3. The exciter according to claim 1, wherein the exciter is used for detecting internal defects of concrete by an elastic wave CT method, and is characterized in that: the driving device of the excitation mechanism (4) adopts any one or more of a spring (8), an air cylinder (9) or a motor (10).

4. The exciter according to claim 3, wherein the exciter is used for detecting the internal defects of the concrete by an elastic wave CT method, and is characterized in that: the excitation mechanism (4) comprises a spring (8), and the spring (8) is connected with the vibration hammer (2).

5. The exciter according to claim 3, wherein the exciter is used for detecting the internal defects of the concrete by an elastic wave CT method, and is characterized in that: the excitation mechanism (4) comprises an air cylinder (9), the air cylinder (9) is connected with or corresponds to the exciting hammer (2), and the excitation mechanism (4) also comprises a return spring (11) for returning the exciting hammer (2) when the air cylinder (9) corresponds to the exciting hammer (2).

6. The exciter according to claim 3, wherein the exciter is used for detecting the internal defects of the concrete by an elastic wave CT method, and is characterized in that: the excitation mechanism (4) comprises a motor (10), the output end of the motor (10) is connected with a crank-link mechanism, one end, far away from the motor (10), of the connecting rod is connected with or corresponds to the vibration hammer (2), and when one end, far away from the motor (10), of the connecting rod corresponds to the vibration hammer (2), the excitation mechanism (4) further comprises a reset spring (11) used for enabling the vibration hammer (2) to reset.

7. The exciter according to claim 1, wherein the exciter is used for detecting internal defects of concrete by an elastic wave CT method, and is characterized in that: the signal transmitting device (6) comprises a BNC signal interface, a signal transmitter and a transmitting antenna, and a low-noise shielding cable (12) is connected between the BNC signal interface and the acceleration sensor (3).

8. A detection device for detecting concrete internal defects by adopting an elastic wave CT method comprises a signal receiver (13), and is characterized in that: the signal receiver (13) and the exciter for detecting the internal defects of the concrete by the elastic wave CT method as claimed in any one of claims 1 to 7 are arranged on two opposite sides of the concrete in use, the signal receiver (13) comprises a receiving end adjusting rod (14), at least one receiving end acceleration sensor (15) is arranged on the receiving end adjusting rod (14), and a receiving end signal transmitting device (16) is arranged on the receiving end adjusting rod (14).

9. The apparatus for detecting internal defects of concrete according to claim 8, wherein: the receiving end acceleration sensor device is characterized in that at least two receiving end acceleration sensors (15) are arranged on the receiving end adjusting rod (14), a width adjusting rod (17) is arranged on the receiving end adjusting rod (14), the receiving end acceleration sensors (15) are arranged on the width adjusting rod (17), and scales (18) and clamping grooves (19) used for installing the receiving end acceleration sensors (15) are arranged on the width adjusting rod (17).

10. The apparatus for detecting internal defects of concrete according to claim 8, wherein: a receiving end adjusting mechanism (20) used for adjusting the angle between the receiving end adjusting rod (14) and the width adjusting rod (17) is arranged between the receiving end adjusting rod (14) and the width adjusting rod (17), and both the exciter adjusting rod (1) and the receiving end adjusting rod (14) can contract and extend.