Structure striking device

Abstract

The present invention provides a structural striking device that can generate sufficient striking force while having a simple assembly and mechanism, and can reliably suppress variations in striking force. [Solution] The structural hammering device A used for hammering inspection of structures comprises a hammer tip 9 for hammering the structure, a sliding part 7 that is movable while supporting the hammer tip 9, a spring 8 held by the sliding part 7, a cam follower 6 provided on the sliding part 7 for compressing and releasing the spring 8, a cam 5 that can contact the cam follower 6, and a motor gear mechanism 4 for driving the cam 5.

Description

[Technical Field]

[0001] The present invention relates to a structure tapping device used for tapping inspection of structures such as concrete, bricks, steel frames, steel pipes and the like. [Background Art]

[0002] As this type of structure tapping device, a device that taps structures such as concrete, bricks, steel frames, steel pipes and the like with a tapping member (hammer) has been proposed (see, for example, Patent Document 1).

[0003] For example, the device described in Patent Document 1 is configured to tap (strike) a hammer against a structure using a plurality of springs and a partial gear (intermittent gear). [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 60-212569 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] However, in conventional structure tapping devices, when the tapping member ejected by compression and release of the spring hits the structure, the tapping member rebounds in various ways, so that the meshing position of the partial gear is not always constant, and as a result, the spring contracts unevenly for each tapping, which causes the problem that variation occurs in tapping force.

[0006] On the other hand, in the device described in Patent Document 1, a plurality of springs (a pressing spring and a return spring) are provided to prevent rebound of the tapping member, but with such a configuration, sufficient tapping force cannot be obtained, and since a plurality of springs are incorporated, assembly and the mechanism are complicated.

[0007] The present invention has been made in view of the above points, and aims to provide a structural striking device that can generate sufficient striking force while having a simple assembly and mechanism, and can reliably suppress variations in striking force. [Means for solving the problem]

[0008] The present invention A structural tapping device used for tapping inspection of structures, A striking member for striking the aforementioned structure, A sliding part that is movable while supporting the striking member, The spring held in the aforementioned sliding part, A cam follower is provided on the sliding part to compress and release the spring, A cam that can contact the cam follower, A drive mechanism for driving the cam, The present invention provides a structural striking device equipped with the following features.

[0009] In a preferred embodiment of the present invention, The cam follower is positioned along the axis of movement of the sliding portion.

[0010] In a preferred embodiment of the present invention, The striking energy generated by the compression and release of the spring is 0.1 to 1 J.

[0011] In a preferred embodiment of the present invention, The striking member has a hammer-shaped striking surface with a curved radius of 20 to 40.

[0012] In a preferred embodiment of the present invention, The device is equipped with dustproof means to prevent dust from entering the area around the sliding portion.

[0013] In a preferred embodiment of the present invention, The dustproofing means is a grease-filled section provided around the sliding portion.

[0014] In a preferred embodiment of the present invention, The filling portion is provided with an oil filler opening, and the oil or fat can be replenished through the oil filler opening.

[0015] According to the structure striking device of the present invention, it is only necessary to incorporate a single spring so as to be held by the sliding portion, and this spring is constantly compressed and released at a constant position by the cam and the cam follower. Therefore, sufficient striking force can be generated while achieving a simple assembly and mechanism, and variation in striking force can be reliably suppressed.

Effects of the Invention

[0016] According to the present invention, sufficient striking force can be generated while achieving a simple assembly and mechanism, and variation in striking force can be reliably suppressed.

Brief Description of the Drawings

[0017] [Figure 1] It is a diagram schematically showing the internal structure of a structure striking device according to an embodiment of the present invention. [Figure 2] It is a perspective view showing the essential parts of a structure striking device according to an embodiment of the present invention. [Figure 3] It is a diagram for explaining the operation of a structure striking device according to an embodiment of the present invention. [Figure 4] It is a diagram showing an example of use of the structure striking device according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0018] Hereinafter, with reference to the accompanying drawings, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail. In the following drawings, the same or similar elements are denoted by the same reference numerals throughout the description of the embodiment.

[0019] [Device Configuration] Figure 1 is a schematic diagram showing the internal structure of a structural hammering device according to one embodiment of the present invention, and Figure 2 is a perspective view showing its main parts. The structural hammering device A is used to inspect the sound and vibration of structures such as concrete, brick, steel frames, and steel pipes, and serves a role similar to that of a so-called inspection hammer.

[0020] As shown in Figures 1 and 2, the structural striking device A is used to strike structures (not shown), and its main components include an outer casing 1, a battery 2, a power control board 3, a motor gear mechanism 4, a cam 5, a cam follower 6, a sliding part 7, a spring 8, and a hammer tip 9 as a striking member for the structure.

[0021] The outer casing 1 has an internal space where a power control board 3 and a motor gear mechanism 4 are arranged, as well as a cylindrical portion 10 into which a slide portion 7 is inserted so as to be able to slide and move horizontally. The front end opening 10a of the cylindrical portion 10 is open so as to expose the striking surface 90 of the hammer tip 9, which will be described later, to the outside. Multiple oil inlets 11 are provided at equal intervals on the outer surface of the front end of the cylindrical portion 10. Sealing oil can be injected into the oil inlets 11, and a filling portion 12 filled with sealing oil is formed between the inner circumferential surface of the front end of the cylindrical portion 10 and the outer circumferential surface of the slide portion 7. For example, a relatively high viscosity grease can be appropriately replenished in the filling portion 12 from the oil inlets 11 using a grease gun B as sealing oil. A felt seal 13 is provided so as to be in close contact between the inner circumferential surface of the cylindrical portion 10 and the outer circumferential surface of the slide portion 7 on the rear end side of the filling portion 12. With this filling section 12 and felt seal 13, a dustproofing mechanism is achieved, effectively preventing dust from entering the cylindrical section 10 from the front end to the interior. The sealing oil in the filling section 12 has lower friction than so-called oil seals and also has the effect of reducing sliding friction between the inner surface of the cylindrical section 10 and the outer surface of the sliding section 7. Multiple guides 14 are provided on the front end surface of the cylindrical section 10 so as to conform to the surface of the structure. A rotatable connecting section 15 for rotatably connecting a pole P (see Figure 3) for working at heights is connected to the lower part of the outer casing 1. Near the rotatable connecting section 15, a wire hole 16 is provided to prevent the structure striking device A from detaching and falling from the pole P by connecting the pole P through a wire (not shown).

[0022] Battery 2 is the power source for the motor gear mechanism 4 and is mounted on the rear of the outer casing 1 in a replaceable manner via a battery cover 20 and a locking pin 21. Battery 2 is connected to the power control board 3 via a power cable 22 so as to be able to supply power. The power cable 22 is secured inside the outer casing 1 via a cable tie 23. The overall dimensions of the structural striking device A, including the outer casing 1, locking pin 21 and battery cover 20, in plan view are approximately 130 mm in height and 120 mm in width.

[0023] The power control board 3 controls the start of the motor gear mechanism 4 and, although not shown in detail in the illustrations, is connectable to an external computer and has communication functions that allow it to exchange acquired sound and vibration data. The power control board 3 has a start switch 30 and is connected to the motor 40 of the motor gear mechanism 4 (described later) via an internal cable 31. The power control board 3 has sensors and a communication control unit (not shown) for acquiring and transmitting sound and vibration data to and from the outside. The power control board 3 is connected to an external computer via a communication interface. The start switch 30 is positioned on the outer surface of the outer casing 1 so as to be pressable. When the start switch 30 is pressed, the motor gear mechanism 4 is operated by the drive of the motor 40. The start switch 30 may be linked to a mechanical operating means such as a trigger.

[0024] The motor gear mechanism 4 is a drive mechanism that operates the slide part 7 by driving force while reducing the rotational drive. The motor gear mechanism 4 is incorporated inside the outer casing 1 as a gearbox having a motor 40 and a plurality of gears 41 to 47. The motor 40 is an overheat protection component with a thermal fuse, and rotates gear 41 fixed to the drive shaft, thereby rotationally driving gear 42 which meshes with gear 41. Gear 42 rotates together with gear 43, and rotates gear 44 which meshes with gear 43. Gear 44 rotates together with gear 45, and rotates gear 46 which meshes with gear 45. Gear 46 meshes with gear 47 fixed to the rotation axis of the cam 5, which will be described later, and rotates gear 47 in one direction. Gear 47 rotates in the clockwise direction shown by the arrow in Figure 1 as an example, thereby rotating the cam 5. The gear 47 (cam 5) rotates at a constant speed determined by the gear ratio, for example, once every 0.6 to 2 seconds during a single sound and vibration test. As a result, the cam 5 rotates repeatedly with each test. In this embodiment, since there are two contact points 50 of the cam 5 (described later), striking can be performed in a cycle of 0.3 to 1 second.

[0025] The cam 5 causes the cam follower 6 to move linearly along the central axis C. The cam 5 has a pair of contact portions 50 that are point-symmetric with respect to its axis of rotation. The contact portions 50 are formed on a cam profile curved surface such that their contact points are generally always aligned with the central axis C until they are in contact with the cam follower 6 and then become non-contact. In such a cam 5, when it rotates once, the two contact portions 50 come into contact with the cam follower 6 once each. In this embodiment, two cams 5 are provided, but there may be just one cam 5, or three or more cams 5 may be provided at equal intervals. The fewer the number of cams 5, the more efficiently they can rotate without deceleration, and the more cams there are, the more times they can come into contact efficiently and periodically.

[0026] A pair of cam followers 6 are fixed to the outer surfaces of both sides of the slide portion 7, each capable of contacting the contact portion 50 of the cam 5. When the cam follower 6 is in contact with the contact portion 50 and then becomes non-contact, its contact portion is formed on a curved surface with an oval shape (elliptical cross-section in the example shown in Figure 1) such that it is always roughly aligned with the central axis of movement C. When the cam 5 rotates in the clockwise direction indicated by the arrow in Figure 1, the cam follower 6 moves to the right along the central axis of movement C, while the contact portion remains in contact with the contact portion 50, together with the slide portion 7. As the cam 5 rotates further in the same direction, the cam follower 6 eventually becomes non-contact with the contact portion 50. At this point, the compressive elastic force of the spring 8, described later, is released, causing the slide portion 7 to move rapidly to the left. Note that the cam follower 6 could be a simple pin with a circular cross-section, for example, as long as the contact portion can roughly align with the central axis of movement C.

[0027] The slide portion 7 moves the hammer tip 9 forcefully in the striking direction (leftward as shown in Figure 1) by the compressive elastic force of the spring 8. The slide portion 7 has a spring housing 70 that houses the spring 8 in a position along the central axis of movement C, and a cylinder 71 which is integrated with the outside of the spring housing 70 and has cam followers 6 provided on both outer surfaces. The spring housing 70 receives the compressive elastic force of the spring 8 housed inside at its front end, and is biased to the leftward as shown in Figure 1 by this compressive elastic force. The cylinder 71 is integrated with the spring housing 70 and moves together with the cam followers 6 along the central axis of movement C. As a result, the slide portion 7 moves to the rightward as shown in Figure 1 to compress the spring 8, and when the compressive elastic force of the spring 8 is released, it moves forcefully to the leftward as shown in Figure 1 by the compressive elastic force. In this embodiment, the slide portion 7 is formed in a prismatic shape, but it may also be formed in a cylindrical shape.

[0028] The spring 8 is used to move the slide portion 7 in the striking direction by compressive elastic force. The front end to the middle portion of the spring 8 is housed in the spring housing 70. The base end of the spring 8 is held by a spring locking portion 80 provided at the bottom of the cylindrical portion 10. The spring 8 is positioned so that its axis roughly coincides with the axis of movement C. For such a spring 8, if the spring constant is k and the amount of compression is x, the compressive elastic force (elastic energy E) is as follows. E = (1 / 2) × k × x 2 In other words, the striking force (striking energy), ignoring energy loss due to friction, etc., is roughly equivalent to the elastic energy E when the spring 8 is most compressed. In the structural striking device A of this embodiment, the striking force is set to be approximately 0.1 to 1 J.

[0029] The hammer tip 9 is made of steel, for example, and is used to strike the surface of a structure. The hammer tip 9 has a gently curved (hammer-shaped) striking surface 90 and is fixed to the front end of the slide portion 7 (cylinder 71) via a shoulder bolt 91. The striking surface 90 has, for example, an SR (Sphere Radius) of 20 to 40, with the maximum diameter at the front being approximately 17 mm and the maximum diameter at the base being approximately 16 mm. As the slide portion 7 is moved forcefully by the compressive elastic force of the spring 8, the hammer tip 9 is launched from the front end opening 10a of the cylindrical portion 10 toward the front side where the structure is located, striking the surface of the structure.

[0030] [Device Operation] Figure 3 is a diagram illustrating the operation of the structural striking device A. Figure (a) shows the state before the spring 8 is compressed and strikes, and Figure (b) shows the state at the moment the spring 8 is released and strikes.

[0031] As shown in Figure 3(a), when the cam 5 rotates to a certain extent from the state shown in Figure 1, the contact portion 50 contacts the cam follower 6 and pushes the cam follower 6 to the right. This moves the slide portion 7 to a predetermined position to the right, and the spring 8 housed inside it is compressed until the contact between the contact portion 50 and the cam follower 6 is released. At this time, the contact area between the contact portion 50 and the cam follower 6 is displaced along the central axis C of movement, which roughly coincides with the axis of the spring 8. Therefore, it is difficult for a couple (rotational moment) that would bend the spring 8 housed in the slide portion 7 and the cylindrical portion 10 to act upon it. In other words, the spring 8 is compressed while maintaining a generally straight posture, and can maintain a sufficient elastic compressive force corresponding to the striking force.

[0032] When the spring 8 maintains sufficient elastic compressive force, the striking surface 90 of the hammer tip 9 is positioned behind the front end opening 10a of the cylindrical portion 10, relative to the guide 14 which is in contact with a structure (not shown), and a sufficient striking distance is formed between them without the striking surface 90 contacting the structure.

[0033] Furthermore, since an oil-filled section 12 and a felt seal 13 are provided between the front end opening 10a of the cylindrical section 10 and the bottom where the spring-locking section 80 is located, dust near the surface of the structure does not penetrate deep into the cylindrical section 10, and the sliding section 7 moves smoothly with relatively low friction.

[0034] As the cam 5 rotates further from the state shown in Figure 3(a), the contact portion 50 disengages from the cam follower 6 without making contact. Then, as shown in Figure 3(b), the compressive elastic force of the spring 8 is released, and accordingly the slide portion 7 moves rapidly to the left, causing the striking surface 90 of the hammer tip 9 to be launched forward of the front end opening 10a of the cylindrical portion 10 and the guide 14. As a result, the surface of the structure is struck by the striking surface 90 of the hammer tip 9.

[0035] When the hammer tip 9 strikes the structure, the slide portion 7 is slightly displaced to the right and inward of the cylindrical portion 10 against the compressive elastic force of the spring 8 as the hammer tip 9 bounces back. As a result, the cam follower 6 also moves slightly to the right, but at this time, the contact portion 50 located below and the cam follower 6 are separated and have not yet come into contact, so the cam 5 is rotated with ample margin until the next contact portion 50 comes into contact with the cam follower 6. In other words, the spring 8 is repeatedly compressed and released by the contact and separation of the cam 5 and the cam follower 6, so that the compressive elastic force of the spring 8 is always constant, and consequently the striking force is always constant.

[0036] This striking motion is repeated twice, for example, every time the cam 5 rotates once, and the sound and vibration data acquired during this process are transmitted to an external computer.

[0037] [Examples of device usage] Figure 4 shows an example of the use of the structural beating device A. As shown in the example in the figure, the structural beating device A is detachably attached to the tip of a retractable pole P. Worker X uses this pole P to inspect the sound and vibration of a light fixture L at a high position. The pole P has a rotatable rotating part (not shown) attached to its tip. This rotating part is connected to the rotating coupling part 15 of the structural beating device A. When moving the structural beating device A in the vertical or horizontal direction, the rotating part can be moved using auxiliary connectors or support rods.

[0038] Furthermore, if the structure striking device A is designed to be attachable to pole P, the activation switch 30 may be pressed by operating the trigger via an operating mechanism provided on pole P, or it may be designed to maintain the trigger's operating state (for example, by holding the trigger and pressing and holding the activation switch 30). The structure striking device A may also be mounted on a suitable mobile device instead of pole P.

[0039] [Effects and Effects of the Device] As is clear from the above description, the structural striking device A of this embodiment can exhibit the following excellent effects.

[0040] According to the structural striking device A, it is simply necessary to incorporate a single spring 8 so as to hold it in the sliding part 7, and since this spring 8 is always compressed and released at a constant contact position and release position by the cam 5 and cam follower 6, it is possible to generate sufficient striking force while keeping the assembly and mechanism simple, and to reliably suppress variations in striking force.

[0041] According to the structural beating device A, the beating action is repeated simply by operating the start switch 30, so the worker X can perform the work automatically without needing to use arm strength or grip strength.

[0042] According to the structural beating device A, by mounting it on a pole P or a mobile device, etc., the worker X does not need to approach the surface of the structure, and inspection work can be performed without the need for, for example, an aerial work platform.

[0043] The structural impact device A improves work efficiency, which in turn reduces inspection time and consequently lowers inspection costs.

[0044] The structural impact device A can generate a constant impact force without requiring special work skills, thereby improving inspection accuracy.

[0045] In the structural striking device A, the cam follower 6 is positioned along the central axis C of movement of the slide portion 7. More specifically, the contact area between the cam 5 and the cam follower 6 is always aligned with the central axis C of movement, which roughly coincides with the axis of the spring 8, even when the slide portion 7 is displaced. This allows the spring 8 to be compressed almost straight without bending, and consequently, a sufficient striking force corresponding to the elastic compressive force of the spring 8 can be generated. Furthermore, friction of the cam follower 6 and deformation of the spring 8 during compression can be reduced, improving the stability of the striking operation and driving efficiency, and consequently extending the battery life.

[0046] The structural hammering device A can produce the same impact force (0.1-1J) and vibration as manual hammering using a handheld hammer, and the same sound and vibration as manual hammering can be obtained. Therefore, the same anomaly detection methods used for manual hammering can be applied to data analysis. In addition, it can minimize damage to the structure from the impact without causing unexpected damage.

[0047] With the structural beating device A, the filling section 12 and the felt seal 13 prevent dust from entering the inner part of the cylindrical section 10, thereby preventing damage to the motor gear mechanism 4 and preventing malfunctions.

[0048] According to the structural hammering device A, since the sealing oil in the filling section 12 has relatively low friction, the sliding friction of the sliding section 7 can be reduced as much as possible.

[0049] With the structural hammering device A, when sealing oil is replenished from the oil inlet 11, the existing sealing oil mixed with dust can be pushed out from the filling section 12 through the area around the hammer tip 9 (the front end opening 10a of the cylindrical section 10) to the outside, thus eliminating the need for disassembly and cleaning of the device and making it easy to handle.

[0050] It should be noted that the present invention is not limited to the embodiments described above. The external shape of the structural striking device A is not particularly limited, but for example, it may be handgun-shaped and handheld for operation. Furthermore, the number, size, type, and material of the striking members, internal gears, and springs are not particularly limited and can be designed as appropriate. In addition, the structures to be inspected for sound and vibration are not particularly limited, and the structural striking device A can be applied to all kinds of structures. [Explanation of Symbols]

[0051] A Structure striking device C Center axis of movement 1. Outer casing 10 Cylinder part 10a Front end opening 11 Fuel filler cap 12 Filling section (dustproofing means) 13. Felt seal (dustproofing measure) 2 batteries 3 Power Control Board 4. Motor gear mechanism (drive mechanism) 5 Cam 50 Contact part 6 Cam Followers 7. Slide section 8 springs 9. Hammer tip (striking element) 90 Hitting surface

Claims

1. A structural tapping device used for tapping inspection of structures, A striking member for striking the aforementioned structure, A sliding part that is movable while supporting the striking member, The spring held in the aforementioned sliding part, A cam follower is provided on the sliding part to compress and release the spring, A cam that can contact the cam follower, A drive mechanism for driving the cam, A structural striking device equipped with the following features.

2. The cam follower is positioned along the central axis of movement of the slide portion. The structural striking device according to claim 1.

3. The striking energy generated by the compression and release of the spring is 0.1 to 1 J. The structural striking device according to claim 1.

4. The striking member has a hammer-shaped striking surface with a curved radius of 20 to 40. The structural striking device according to claim 1.

5. The sliding portion is equipped with a dustproof means to prevent dust from entering the surrounding area. The structural striking device according to claim 1.

6. The dustproofing means is a grease-filled section provided around the slide portion. The structural striking device according to claim 5.

7. The filling section is provided with a fuel inlet, and the oil can be replenished through the fuel inlet. The structural striking device according to claim 6.

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