Stress wave sensor device for nondestructive testing of anchoring quality of anchor rod

Abstract

The utility model belongs to the technical field of roadway anchor rod support quality detection, and particularly discloses a stress wave sensor device for nondestructive testing of anchoring quality of an anchor rod. The stress wave sensor device comprises a fixed base, a supporting seat, a stress wave receiver, a vibration exciter supporting frame and a vibration exciter. The vibration exciter drives the telescopic rod to contract through the motor, after the vibration excitation head compresses the force application spring to the contraction limit, the force application spring recovers deformation and then drives the vibration excitation head to knock the anchor rod, it is guaranteed that the vibration excitation strength of each time is consistent in the detection process, and interference of the vibration excitation process to the accuracy of the detection result is reduced. The stress wave receiver converts the reflected stress wave into an electric signal and transmits the electric signal to a detection instrument, the stress wave detection method avoids damage caused by destructive detection, and nondestructive detection of the anchoring quality is achieved. In addition, the rotator adjusts the distance between the first sensor and the second sensor through rotation of the fan blades, and the detection requirements of anchor rods and anchor cables with different diameters are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of roadway bolt support quality detection, and relates to a stress wave sensor device for non-destructive detection of bolt anchoring quality. Background Technique

[0002] As the main roadway support method, the bolt structure has the characteristics of large aspect ratio and implicit support. Due to construction, environmental and other factors, defects are generated inside the bolt, which makes the bolt anchoring structure have potential hazards and pose a threat to engineering safety. Therefore, it is necessary to detect the anchoring quality of the bolt.

[0003] The traditional bolt anchoring quality detection method is mainly the pull-out force test of the bolt. This method is not only a destructive test, but also the measured pull-out capacity cannot fully reflect the anchoring state of the bolt. To overcome this problem, the non-destructive detection method of bolts has emerged. When the existing bolt non-destructive detection instruments detect the bolt length and anchoring length, the stress wave detection method is usually used. Exciting the bolt is one of the important links in stress wave non-destructive detection. The tester needs to use an exciting hammer to excite along the axial direction of the bolt to generate stress waves. The stress wave receiver installed on the bolt surface transmits the reflected stress waves to the main body of the detection instrument. However, since manual knocking cannot ensure that the force is the same each time, it is easy to cause differences in the detection values and reduce the detection accuracy.

[0004] Based on this, there is an urgent need to propose a new type of non-destructive detection device for bolt anchoring quality to solve the above technical problems existing in the prior art. Content of the Utility Model

[0005] The purpose of the utility model is to propose a stress wave sensor device for non-destructive detection of bolt anchoring quality, ensuring that the exciting force is consistent each time during the non-destructive detection process of bolt anchoring quality and reducing the interference to the detection results.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A stress wave sensor device for non-destructive detection of bolt anchoring quality includes a fixed base, a support base, a stress wave receiver, an exciter and an exciter support frame;

[0008] The fixed base is provided with a first through hole for the bolt to pass through;

[0009] The support base is arranged above the fixed base, and the support base is provided with a second through hole for the bolt to pass through;

[0010] The stress wave receiver is arranged above the support base, and the stress wave receiver is provided with a wiring terminal, and the wiring terminal is connected to a detection instrument through a data transmission line;

[0011] The vibrator is arranged above the second through hole, and the side of the vibrator is fixedly connected to the upper end of the vibrator support frame;

[0012] The lower end of the vibrator support frame is connected to the stress wave receiver.

[0013] Preferably, the vibrator includes a sleeve, a telescopic rod, a vibration head and a biasing spring;

[0014] One end of the sleeve close to the anchor rod is an open end, and the other end of the sleeve is provided with a closed end plate;

[0015] The telescopic rod is arranged in the inner cavity of the sleeve. The upper end of the telescopic rod passes through the end plate. The upper end of the telescopic rod is used to connect the motor, and the lower end of the telescopic rod is connected to the vibration head;

[0016] The biasing spring is sleeved on the telescopic rod, and both ends of the biasing spring abut against the end plate and the vibration head respectively;

[0017] The telescopic rod contracts and extends along the axis direction of the sleeve. The contraction of the telescopic rod is driven by the motor, and the extension of the telescopic rod is driven by the acting force of the biasing spring after being compressed by the vibration head and restoring deformation.

[0018] Preferably, the stress wave receiver includes a first sensor and a second sensor;

[0019] The first sensor and the second sensor are symmetrically arranged on both sides of the second through hole respectively, and grooves are respectively arranged in the central parts of the contact surfaces of the first sensor and the second sensor;

[0020] The lower end of the vibrator support frame is respectively connected to the first sensor and the second sensor.

[0021] Preferably, a first sliding groove is arranged along the length direction at the top of the support seat, and first sliders are respectively arranged at the bottoms of the first sensor and the second sensor. The first sliding groove is slidably connected to the first slider;

[0022] Second sliding grooves are arranged at the tops of the first sensor and the second sensor along the direction parallel to the first sliding groove, and a second slider is arranged at the lower end of the vibrator support frame. The second sliding groove is slidably connected to the second slider;

[0023] A limiting hole is arranged on one side of the second sensor. One end of the orienting shaft is fixedly connected to the first sensor, and the other end of the orienting shaft passes through the limiting hole and extends to the outside of the second sensor.

[0024] Preferably, a limiting rod is connected to the extending section of the orienting shaft extending out of the second sensor.

[0025] Preferably, there are two orienting shafts, and the two orienting shafts are respectively arranged on both sides of the first sensor and the second sensor along the direction parallel to the second sliding groove;

[0026] A limiting rod is connected between the extension sections where two orientation axes extend out of the second sensor.

[0027] Preferably, a return spring is sleeved on the orientation axis, and two ends of the return spring respectively abut against the first sensor and the second sensor.

[0028] Preferably, a rotator is further included, and the rotator includes a rotation axis, fan blades and a rotation handle;

[0029] Wherein, the lower end of the rotation axis is rotationally connected to the fixed base, the fan blades are arranged on the rotation axis, one side of the fan blades abuts against the second sensor, and one end of the rotation handle is connected to the side surface of the rotation axis;

[0030] Both sides of the fan blades respectively abut against the second sensor and the limiting rod. The fan blades rotate to push the second sensor to slide inwards along the first sliding groove, and at the same time, the orientation axis pulls the first sensor to slide inwards.

[0031] Preferably, an installation hole is arranged along the length direction inside the rotation axis;

[0032] A rotation axis fixing rod is arranged on the fixed base, the rotation axis fixing rod is provided with threads, and a fastening nut is arranged at the upper end of the rotation axis fixing rod;

[0033] The rotation axis fixing rod penetrates through the installation hole.

[0034] Preferably, the first through hole and the second through hole are circular holes. The first through hole is arranged at the center position of the fixed base, and the second through hole is arranged at the center position of the support base;

[0035] The sleeve is of a cylindrical structure, and the center of the cross section of the sleeve is coaxial with the centers of the first through hole and the second through hole.

[0036] Compared with the prior art, the utility model has the following beneficial effects:

[0037] As described above, the utility model relates to a stress wave sensor device for non-destructive detection of bolt anchoring quality. The exciter drives the telescopic rod to contract through a motor. After the excitation head compresses the force application spring to the contraction limit, the force application spring restores deformation and then drives the excitation head to strike the bolt, ensuring that the excitation force is consistent each time during the detection process and reducing the interference of the excitation process on the accuracy of the detection result. The stress wave receiver converts the reflected stress wave into an electrical signal and transmits it to the detection instrument. The stress wave detection method avoids the damage caused by destructive detection and realizes the non-destructive detection of the anchoring quality. In addition, the rotator adjusts the distance between the first sensor and the second sensor by the rotation of the fan blades, meeting the detection requirements for bolts and cables with different diameters. Description of the Drawings

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0039] Figure 1 It is a schematic structural diagram of the clamping state of the stress wave sensor device for non-destructive detection of the anchoring quality of the anchor rod in the embodiment of the present invention;

[0040] Figure 2 It is a schematic structural diagram of the open state of the stress wave sensor device for non-destructive detection of the anchoring quality of the anchor rod in the embodiment of the present invention;

[0041] Figure 3 It is a top view of the fixed base in the embodiment of the present invention;

[0042] Figure 4 It is a top view of the support seat in the embodiment of the present invention;

[0043] Figure 5 It is a top view of the stress wave receiver in the embodiment of the present invention;

[0044] Figure 6 It is a schematic structural diagram of the exciter when the telescopic rod is in the retracted state in the embodiment of the present invention;

[0045] Figure 7 It is a schematic structural diagram of the exciter when the telescopic rod is in the extended state in the embodiment of the present invention;

[0046] Figure 8 It is a schematic structural diagram of the rotator in the embodiment of the present invention.

[0047] Among them, 0 - anchor rod, 1 - fixed base, 11 - first through hole, 12 - rotating shaft fixing rod, 121 - fastening nut, 2 - support seat, 21 - second through hole, 22 - first sliding groove, 3 - stress wave receiver, 31 - wiring terminal, 32 - first sensor, 33 - second sensor;

[0048] 34 - orientation shaft, 35 - groove, 36 - second sliding groove, 37 - limiting rod, 38 - return spring, 4 - exciter support frame, 5 - exciter, 51 - sleeve, 511 - end plate, 52 - telescopic rod, 53 - excitation head, 54 - force - applying spring, 6 - rotator, 61 - rotating shaft, 62 - fan blade, 63 - rotating handle. Specific embodiments

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0050] Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0051] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0052] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0053] In the present utility model, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0054] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0055] Embodiment:

[0056] As Figures 1 to 2 shown, the stress wave sensor device for non-destructive detection of bolt anchoring quality in this embodiment includes a fixed base 1, a support base 2, a stress wave receiver 3, a vibrator support frame 4, a vibrator 5, and a rotator 6.

[0057] The fixed base 1 is rectangular and is located at the bottom of the stress wave sensor device. As Figure 3 shown, a first through hole 11 for the bolt 0 (or cable) to pass through is provided on the fixed base 1. The first through hole 11 is a circular hole and is provided at the center position of the fixed base 1.

[0058] The support base 2 is arranged above the fixed base 1. The shape of the support base 2 is the same as that of the fixed base 1, and the size of the support base 2 is smaller than that of the fixed base 1. The two are of an integral structure. As Figure 4 shown, a second through hole 21 for the anchor rod 0 (or cable) to pass through is arranged on the support base 2. The second through hole 21 is a circular hole and is arranged at the central position of the support base 2.

[0059] A first sliding groove 22 is arranged on the top of the support base 2 along the length direction. There are two sliding grooves 22, and the two sliding grooves 22 are symmetrically arranged on both sides of the second through hole 21 and extend to the two ends of the support base 2 along the length direction respectively.

[0060] As Figure 1 、 Figure 2 and Figure 5 shown, the stress wave receiver 3 is arranged above the support base 2. A wiring terminal 31 is arranged on the stress wave receiver 3, and the wiring terminal 31 is connected to a detection instrument (not shown in the figure) through a data transmission line.

[0061] The stress wave receiver 3 includes a first sensor 32 and a second sensor 33.

[0062] The first sensor 32 and the second sensor 33 are respectively symmetrically arranged on both sides of the second through hole 21. Grooves 35 are respectively arranged at the central parts of the contact surfaces of the first sensor 32 and the second sensor 33. The grooves 35 are triangular in shape and are used to clamp the anchor rod 0. First sliders are respectively arranged at the bottoms of the first sensor 32 and the second sensor 33, and the first sliders are slidably connected to the first sliding groove 22. Second sliding grooves 36 are arranged on the tops of the first sensor 32 and the second sensor 33 along the direction parallel to the first sliding groove 22.

[0063] A limiting hole is arranged on one side of the second sensor 33. One end of the directional shaft 34 is fixedly connected to the first sensor 32, and the other end of the directional shaft passes through the limiting hole and extends to the outside of the second sensor 33. There are two directional shafts 34, and the two directional shafts 34 are respectively arranged on both sides of the first sensor 32 and the second sensor 33 along the direction parallel to the second sliding groove 36. A limiting rod 37 is connected between the extending sections of the two directional shafts 34 extending out of the second sensor 33, and the limiting rod 37 is fixedly connected to the extending sections of the two directional shafts 34 respectively through nuts. A return spring 38 is sleeved on the directional shaft 34, and the two ends of the return spring 38 are respectively abutted against the first sensor 32 and the second sensor 33.

[0064] The exciter 5 is arranged above the second through hole 21. The side surface of the exciter 5 is fixedly connected to the upper end of the exciter support frame 4. A second slider is arranged at the lower end of the exciter support frame 4, and the second slider is slidably connected to the second sliding groove 36.

[0065] The lower end of the exciter support frame 4 remains stationary relative to the fixed base plate 1. When the first sensor 32 and the second sensor 33 on the support base 2 slide inward, they press against the anchor rod 0, and the stress wave sensor device turns into a clamped state. When the first sensor 32 and the second sensor 33 slide outward, they separate, and the stress wave sensor device turns into an open state. By adjusting the distance between the first sensor 32 and the second sensor 33, anchor rods (or cables) with different diameters can pass through the groove 35.

[0066] As Figures 6 to 7 shown, the exciter 5 includes a sleeve 51, a telescopic rod 52, an excitation head 53, and a biasing spring 54.

[0067] The sleeve 51 has a cylindrical structure, and the center of the cross-section of the sleeve 51 is coaxial with the centers of the first through hole 11 and the second through hole 21. One end of the sleeve 51 close to the anchor rod 0 is an open end, and the other end of the sleeve 51 is provided with a closed end plate 511.

[0068] The telescopic rod 52 is arranged in the inner cavity of the sleeve 51. The upper end of the telescopic rod 52 passes through the end plate 511. The upper end of the telescopic rod is used to connect to the motor. The lower end of the telescopic rod 52 is connected to the excitation head 53. The telescopic rod 52 and the excitation head 53 are of an integral structure. The biasing spring 54 is sleeved on the telescopic rod 52, and both ends of the biasing spring 54 abut against the end plate 511 and the excitation head 53 respectively. The telescopic rod 52 contracts and extends along the axis direction of the sleeve 51. The contraction of the telescopic rod 52 is driven by the motor, and the extension of the telescopic rod 52 is driven by the acting force of the biasing spring 54 when it recovers from deformation after being compressed by the excitation head 53.

[0069] The upper end of the telescopic rod is connected to the power end of the motor (not shown in the figure). The motor drives the telescopic rod 52 to contract. The telescopic rod 52 drives the excitation head 53 to move towards the direction close to the end plate 511. After the excitation head 53 compresses the biasing spring 54 to the limit, the motor stops driving. The biasing spring 54 recovers from deformation and pushes the excitation head 53 away from the end plate 511. The telescopic rod 52 extends, and the end of the excitation head 53 knocks on the exposed end of the anchor rod 0 to generate stress waves.

[0070] As Figures 1 to 3 and Figure 8 shown, the rotator 6 includes a rotating shaft 61, fan blades 62, and a rotating handle 63.

[0071] An installation hole is arranged along the length direction inside the rotating shaft 61. A rotating shaft fixing rod 12 is arranged at a position close to the end of the short side of the fixed base 1. The rotating shaft fixing rod 12 passes through the installation hole. Threads are arranged on the rotating shaft fixing rod 12, and a fastening nut 121 is arranged at the upper end of the rotating shaft fixing rod 12. The fan blades 62 are arranged on the rotating shaft 61, and both sides of the fan blades 62 abut against the second sensor 33 and the limiting rod 37 respectively. One end of the rotating handle 63 is connected to the side surface of the rotating shaft 61.

[0072] When the rotating handle 63 rotates, it drives the rotating shaft 61 and the fan blade 62 to rotate. The fan blade 62 pushes the outer side of the second sensor 33, causing the second sensor 33 to slide inward along the first sliding groove 22. At the same time, the orientation shaft 34 pulls the first sensor 32 to slide inward to adjust the distance between the first sensor 32 and the second sensor 33. Tighten the fastening nut 121, and the rotator 6 stops rotating and is fixed on the rotating shaft fixing rod 12. The first sensor 32 and the second sensor 33 cooperate to clamp the bolt 0.

[0073] The working process of the stress wave sensor device for non-destructive detection of bolt anchoring quality in this embodiment is as follows:

[0074] In use, the side of the fixed base 1 facing away from the first sliding groove 22 faces the coal wall, and the bolt 0 is sleeved in the inner cavity of the sleeve 51. Manually rotate the rotating handle 63. Under the push of the fan blade 62, the second sensor 33 moves inward. At the same time, the orientation shaft 34 drives the first sensor 32 to move inward. When the groove 35 between the first sensor 32 and the second sensor 33 clamps the bolt 0, stop rotating the rotating handle 63, and then tighten the fastening nut 121. The rotator 6 stops rotating and is fixed on the rotating shaft fixing rod 12, and the stress wave sensor device changes from the open state to the clamped state.

[0075] Connect the data transmission line of the detection instrument to the wiring terminal 31. Input the relevant parameters required for detection in the detection instrument. After input is completed, perform the detection. The motor drives the telescopic rod 52 to contract. The telescopic rod 52 drives the excitation head 53 to move towards the end plate 511. After the excitation head 53 compresses the force application spring 54 to the limit, the motor stops driving. The force application spring 54 restores deformation and pushes the excitation head 53 away from the end plate 511. The telescopic rod 52 extends, and the end of the excitation head 53 knocks on the exposed end of the bolt 0 to generate stress waves. The stress wave receiver 3 converts the reflected stress waves into electrical signals and transmits them to the detection instrument through the data transmission line.

[0076] So far, this embodiment has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the stress wave sensor device for non-destructive detection of bolt anchoring quality of the present invention. Of course, the above is only the preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention and should be protected by the present invention.

Claims

1. A stress wave sensor device for non-destructive testing of bolt anchorage quality, comprising a fixed base, a support base, a stress wave receiver, an exciter and an exciter support frame; characterized in that, A first through hole for the bolt to pass through is provided on the fixed base; The support base is arranged above the fixed base, and a second through hole for the bolt to pass through is provided on the support base; The stress wave receiver is arranged above the support base, a wiring terminal is provided on the stress wave receiver, and the wiring terminal is connected to a detection instrument through a data transmission line; The exciter is arranged above the second through hole, and the side of the exciter is fixedly connected to the upper end of the exciter support frame; The lower end of the exciter support frame is connected to the stress wave receiver.

2. The stress wave sensor device for non-destructive testing of bolt anchorage quality according to claim 1, characterized in that, The exciter includes a sleeve, a telescopic rod, an excitation head and a biasing spring; One end of the sleeve close to the bolt is an open end, and the other end of the sleeve is provided with a closed end plate; The telescopic rod is arranged in the inner cavity of the sleeve, the upper end of the telescopic rod passes through the end plate, the upper end of the telescopic rod is used to connect a motor, and the lower end of the telescopic rod is connected to the excitation head; The biasing spring is sleeved on the telescopic rod, and both ends of the biasing spring are abutted against the end plate and the excitation head respectively; The telescopic rod contracts and extends along the axis direction of the sleeve, the contraction of the telescopic rod is driven by the motor, and the extension of the telescopic rod is driven by the acting force of the biasing spring after being compressed by the excitation head and restoring deformation.

3. The stress wave sensor device for non-destructive testing of bolt anchorage quality according to claim 1, characterized in that, The stress wave receiver includes a first sensor and a second sensor; The first sensor and the second sensor are symmetrically arranged on both sides of the second through hole respectively, and the first sensor and Grooves are respectively arranged at the central parts of the contact surfaces of the second sensors; The lower end of the exciter support frame is connected to the first sensor and the second sensor respectively.

4. The stress wave sensor device for non-destructive testing of bolt anchorage quality according to claim 3, characterized in that, A first sliding groove is arranged along the length direction on the top of the support base, first sliders are respectively arranged at the bottoms of the first sensor and the second sensor, and the first sliding groove is slidably connected to the first slider; Second sliding grooves are arranged along the direction parallel to the first sliding groove on the tops of the first sensor and the second sensor, second sliders are arranged at the lower ends of the exciter support frame, and the second sliding grooves are slidably connected to the second sliders; A limiting hole is arranged on one side of the second sensor, one end of a directional shaft is fixedly connected to the first sensor, and the other end of the directional shaft penetrates through the limiting hole and extends outside the second sensor.

5. The stress wave sensor device for non-destructive testing of bolt anchorage quality according to claim 4, characterized in that, A limiting rod is connected to the extending section of the directional shaft extending out of the second sensor.

6. The stress wave sensor device for non-destructive testing of bolt anchorage quality according to claim 5, characterized in that, There are two orientation axes, which are respectively arranged on both sides of the first sensor and the second sensor along a direction parallel to the second sliding groove; A limiting rod is connected between the extending sections of the two orientation axes extending out of the second sensor.

7. The stress wave sensor device for non-destructive detection of bolt anchoring quality according to any one of claims 4 to 6, characterized in that A return spring is sleeved on the orientation axis, and both ends of the return spring abut against the first sensor and the second sensor respectively.

8. The stress wave sensor device for non-destructive detection of bolt anchoring quality according to claim 5 or 6, characterized in that It further includes a rotator, and the rotator includes a rotating shaft, a fan blade and a rotating handle; Wherein, the lower end of the rotating shaft is rotatably connected to the fixed base, the fan blade is arranged on the rotating shaft, and one end of the rotating handle is connected to the side surface of the rotating shaft; Both sides of the fan blade abut against the second sensor and the limiting rod respectively. When the fan blade rotates, it pushes the second sensor to slide inwards along the first sliding groove. At the same time, the orientation axis pulls the first sensor to slide inwards.

9. The stress wave sensor device for non-destructive detection of bolt anchoring quality according to claim 8, characterized in that An installation hole is arranged along the length direction inside the rotating shaft; A rotating shaft fixing rod is arranged on the fixed base. The rotating shaft fixing rod is provided with threads, and a fastening nut is arranged at the upper end of the rotating shaft fixing rod; The rotating shaft fixing rod penetrates through the installation hole.

10. The stress wave sensor device for non-destructive detection of bolt anchoring quality according to claim 2, characterized in that The first through hole and the second through hole are circular holes. The first through hole is arranged at the center position of the fixed base, and the second through hole is arranged at the center position of the support base; The sleeve is a cylindrical structure, and the center of the cross-section of the sleeve is coaxial with the centers of the first through hole and the second through hole.

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