Striking device

Abstract

To provide a striking device capable of striking an object to be inspected to perform a striking test even in a place provided with only a small gap from the surface of an outer wall and preventing a striking sound from attenuating even in such a case.SOLUTION: A striking device 1 for striking an object to be inspected to perform a predetermined test includes: a body part 10 including a motor 11; a cam 20 attached to a shaft 12 extending from the motor 11; a hammer block 30 including a trigger part 33 being a contactor provided at a position adjacent to the cam 20 and a hammer part 32 for striking the object to be inspected and rotatably provided around a connection shaft 17 extending from the body part 10; an elastic member 40 for providing energization force to the hammer block 30; and an engagement release mechanism 50 for releasing engagement between the hammer block 30 and the elastic member 40 when striking the object to be inspected.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a striking device. [Background technology]

[0002] Civil engineering structures such as bridges and tunnels for roads and railways that were constructed in the past, as well as the exterior walls of large structures such as buildings and apartment buildings, are deteriorating and aging with time, making the maintenance and management of these structures an urgent task. Conventionally, inspections of these civil engineering structures and large structures have been carried out by striking the concrete surface of the structure with a hammer or the like, and workers listening to changes in the striking sounds produced to determine whether the structure is sound or not.

[0003] For example, Patent Document 1 describes a striking device for hammering inspection using a solenoid. In the striking device for hammering inspection described in Patent Document 1, a hammer shaft equipped with a hammer head is slidably attached to a frame, the hammer shaft is connected to an actuator shaft of a solenoid so as to be slidable within a certain range, the hammer shaft and the hammer head advance together when the actuator shaft advances, and after the actuator shaft reaches the forward end, the hammer shaft and the hammer head advance further and collide with an object to be inspected by hammering the object, and the hammering inspection is performed by the hammering sound generated. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-201676 A Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, on the outer walls of civil engineering structures such as railway bridges and tunnels, and large structures such as buildings and apartment buildings, structures such as rain gutters, drainage pipes, water pipes, electric conduits, gas pipes, and air conditioner pipes are sometimes arranged with a small gap from the surface of the outer wall. In such cases, it is necessary for an impact device to pass through the gap. Therefore, since the impact device for impact testing described in Patent Document 1 has a structure in which the hammer head slides by a solenoid, it is necessary to ensure a certain height from the wall surface, making it difficult for the impact device to pass through the gap, and there is a problem that it is difficult to generate impact sounds in the gap using the impact device for impact testing described in Patent Document 1.

[0006] Furthermore, even if the impact device for impact sound inspection described in Patent Document 1 could pass through the gap, if there is only a small gap like this, there is a problem in that after the impact is delivered by the biased hammer, the elastic body such as a spring does not return to its natural length, and the hammer head is pressed against the object to be inspected, which may attenuate the impact sound.

[0007] Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide an impact device that is capable of striking an object to be inspected to perform a hammering inspection even in a place where there is only a small gap from the surface of an exterior wall, and that does not easily attenuate the impact sound even in such a case. [Means for solving the problem]

[0008] The impact device of the present invention is an impact device for striking an inspection object to perform a specified inspection, and is characterized in that it comprises a main body having a motor, a cam attached to a shaft extending from the motor, a hammer block having a hammer portion for striking the inspection object and rotatably arranged around a connecting shaft extending from the main body, an elastic member that imparts a biasing force to the hammer block, and an engagement release mechanism that releases the engagement between the hammer block and the elastic member when striking the inspection object.

[0009] In this specification, "disengaging the hammer block from the elastic member" refers to releasing the pressure caused by the elastic force of the elastic member. In other words, it refers to a state in which the hammer block is not subjected to the elastic force from the elastic member. In addition, "disengaging the hammer block from the elastic member" is a concept that includes not only the case in which the hammer block and the elastic member are separated from each other, but also the case in which the hammer block and the elastic member are in contact with each other, as long as the pressure caused by the elastic force of the elastic member is released. Effect of the Invention

[0010] According to the impact device of the present invention, a cam attached to a shaft extending from a motor, a trigger part which is a contact provided at a position adjacent to the cam, and a hammer block which has a hammer part for impacting an object to be inspected and is provided rotatably about a connecting shaft extending from a main body part are provided, so that the rotation of the cam is transmitted to the hammer block via the trigger part, and the object to be inspected can be impacted by the hammer part. Therefore, since it is not necessary to secure an area for sliding the hammer head by a solenoid as in the case of Patent Document 1, the height of the impact device can be reduced. Therefore, even if a structure such as a gutter or a drainage pipe is arranged with a small gap from the surface of the exterior wall, the impact device can pass through the gap and impact the object to be inspected.

[0011] Furthermore, according to the impact device of the present invention, an engagement release mechanism is provided which releases the engagement between the hammer block and the elastic member when the inspection object is struck. Therefore, even when used in a case where there is only a small gap between the surface of the exterior wall and the structure, the hammer part is not pressed against the inspection object after striking the inspection object, and it is possible to prevent the impact sound from being attenuated. [Brief description of the drawings]

[0012] [Figure 1] 1 is a perspective view showing an impact device 1 according to an embodiment. [Diagram 2] 1A and 1B are a side view and a top view showing an impact device 1 according to an embodiment. [Diagram 3] 3A to 3C are diagrams illustrating the relationship between a cam 20, a hammer block 30, and an elastic member 40 in the embodiment. [Figure 4] 3A to 3C are views for explaining the operation of the impact device 1 according to the embodiment. [Diagram 5] 1 is a diagram showing a state in which an impact device 1 according to an embodiment is mounted on an automatic traveling device 100. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The impact device of the present invention will be described below based on the embodiment shown in the drawings. Note that the embodiment described below does not limit the invention according to the claims. Furthermore, not all of the elements and combinations thereof described in the embodiment are necessarily essential to the solution of the present invention.

[0014] [Embodiment] 1. Configuration of impact device 1 according to embodiment FIG. 1 is a perspective view showing an impact device 1 according to an embodiment. FIG. 1(a) is a perspective view of the impact device 1 as viewed obliquely from above the hammer block 30, and FIG. 1(b) is a perspective view of the impact device 1 as viewed obliquely from below the hammer block 30. Reference numeral 36 denotes a head of a member (e.g., a screw) constituting the connecting shaft 17, which also constitutes the connecting shaft 17 and connects the hammer block 30 to the main body 10. FIG. 2 is a side view and a top view showing the impact device 1 according to an embodiment. FIG. 2(a) is a side view of the impact device 1, and FIG. 2(b) is a top view of the impact device 1. FIG. 3 is a view for explaining the relationship between the cam 20, the hammer block 30, and the elastic member 40 in the embodiment.

[0015] 1 to 3, an impact device 1 according to the embodiment includes a main body 10, a cam 20, a hammer block 30, an elastic member 40, and an engagement release mechanism 50. The impact device 1 is used to impact an object to be inspected and perform a predetermined inspection.

[0016] The main body 10 has a motor 11, a shaft 12, a power source 13, a mounting portion 14, a stopper pin 15, a wheel portion 16, a connecting shaft 17, and a fixing pin 18.

[0017] Any suitable motor can be used as the motor 11, but it is preferable that the motor is light in weight and small in size so that it can be attached to a traveling device that travels on a wall surface, for example. The shaft 12 extends from the motor 11 and transmits the rotational motion from the motor 11. A cam 20 is attached to the tip of the shaft 12. The power source 13 supplies power to the motor 11.

[0018] The mounting portion 14 has a mounting plate on which the motor 11 and the power source 13 are placed, and a side wall is erected on one side (the hammer block side) of the mounting plate. A stopper pin 15, a connecting shaft 17, and a fixing pin 18 are provided outward from the side wall, and a hole for the shaft 12 to pass through is provided at a predetermined position. Four wheels 16 are provided on the underside of the mounting plate to enable the mounting portion 14 to be moved stably.

[0019] The stopper pin 15 extends from the main body 10 towards the hammer block 30. The stopper pin 15 protrudes from the side wall at a position on the side wall opposite the connecting shaft 17 when viewed from the main body 10 side. The connecting shaft 17 protrudes from the side wall and is connected to the hammer block 30, so that the hammer block 30 is configured to be rotatable. A torsion spring, which is an elastic member 40, is attached to the outer periphery of the connecting shaft 17.

[0020] The fixing pin 18 is provided at a position where, for example, it forms an isosceles triangle together with the connecting shaft 17 and the stopper pin 15, and can hook and fix the first arm 42 extending from the torsion spring which is the elastic member 40. Note that, although the first arm 42 is fixed using the fixing pin 18 in the embodiment, the first arm 42 may be fixed using a clip or other appropriate member.

[0021] The cam 20 is attached to the shaft 12 extending from the motor 11. The cam 20 is a plate cam, and is configured so that the length from the shaft 12 to the outer circumferential surface 22 gradually increases, and has a step portion 21 where the length suddenly decreases.

[0022] The hammer block 30 has a hammer block body 31, a hammer portion 32, a trigger portion 33, a biasing force transmission pin 34, and a weight pin 35. The hammer block 30 is connected to the body portion 10 via a connecting shaft 17 on the surface facing the body portion 10. In the hammer block 30, the trigger portion 33 and the biasing force transmission pin 34 protrude from the surface facing the body portion 10, the hammer portion 32 is provided on the lower surface, and the weight pin 35 and pin 36 are provided on the surface opposite the body portion 10 side.

[0023] As shown in Fig. 3, the hammer block body 31 is a generally polygonal prism with an inclined upper side when viewed from the main body 10. The inclination of the upper surface of the hammer block 30 body is configured so that when the hammer block 30 is inclined by the rotation of the cam 20, the inclination of the upper side becomes generally horizontal (see Fig. 4(b)).

[0024] The hammer portion 32 is provided below the hammer block 30 at a position spaced apart from the connecting shaft 17 by a predetermined distance or more.

[0025] The trigger portion 33 is a contact provided at a position adjacent to the cam 20. The trigger portion 33 is a convex portion having a substantially rectangular parallelepiped shape that protrudes from the hammer block 30 side toward the main body portion 10 side, and when the cam 20 rotates, the trigger portion 33 comes into contact with the outer peripheral surface 22 of the cam 20 and is pushed, causing the hammer block 30 to tilt.

[0026] The biasing force transmission pin 34 is a pin that extends from the hammer block 30 side toward the main body 10 side at a position on the inner periphery side of the stopper pin 15 when viewed from the connecting shaft 17. When the hammer block 30 is tilted by the rotation of the cam 20, the biasing force transmission pin 34 lifts up the second arm 43 of the elastic member 40. Note that in the embodiment, a structure for preventing the elastic member 40 from coming off may be added to the tips of the fixed pin 18, the biasing force transmission pin 34, and the stopper pin 15 (in the embodiment, the tip is shaped like a screw head, but other appropriate structures such as bending the tip, shaping it like a claw, attaching a member, etc.).

[0027] The weight pin 35 is provided on the surface opposite to the main body 10, and has a predetermined weight so that when the hammer portion 32 strikes the surface to be inspected, the impact force is greater than or equal to a predetermined value, and the impact sound generated is greater than or equal to a predetermined volume.

[0028] The elastic member 40 is a torsion spring having a coil portion 41 and a first arm portion 42 and a second arm portion 43 extending from the coil portion 41. The torsion spring refers to a spring having a coil portion and two arms, and is a concept including a coil spring and an L-shaped spring. The coil portion 41 is wound around the connecting shaft 17. The first arm portion 42 is hung on the fixing pin 18 and fixed. The second arm portion 43 is hung on the stopper pin 15, and when the hammer block 30 is tilted by the rotation of the cam 20, the second arm portion 43 lifts the biasing force transmission pin 34, and when the inspection object is struck, the biasing force transmission pin 34 is received by the stopper pin 15, thereby releasing the engagement between the hammer block 30 and the elastic member 40.

[0029] The disengagement mechanism 50 is composed of a stopper pin 15 and a force transmission pin 34. When the hammer block 30 tilts due to the rotation of the cam 20, the force transmission pin 34 lifts the second arm 43, thereby applying a force to the elastic member 40. When the cam 20 disengages from the trigger portion 33 and strikes the object to be inspected, the second arm 43 is received by the stopper pin 15, thereby releasing the engagement between the hammer block 30 and the elastic member 40.

[0030] Specifically, the state is as follows. After the biasing force transmission pin 34 lifts the second arm 43 and the elastic member 40 contracts, when the force that had been contracting the elastic member 40 due to the step of the cam 20 is released, an elastic force acts on the elastic member 40, and it tries to return to its original length (return to its natural length). Therefore, the hammer block 30 is receiving an elastic force from the elastic member 40, and the pressure due to the elastic force has not yet been released. Then, when the elastic member 40 is received by the stopper pin 15 and the hammer block 30 is freed from the elastic member 40, the hammer block 30 is no longer receiving an elastic force from the elastic member 40, and the engagement between the hammer block 30 and the elastic member 40 is released.

[0031] 2. Operation of the impact device 1 according to the embodiment Next, the operation of the impact device 1 according to the embodiment will be described. Fig. 4 is a diagram for explaining the operation of the impact device according to the embodiment 1. Fig. 4(a) shows the state of the cam 20, the hammer block 30, the elastic member 40, and the disengagement mechanism 50 when the hammer block 30 is not tilted, Fig. 4(b) shows the state of the cam 20, the hammer block 30, the elastic member 40, and the disengagement mechanism 50 when the hammer block 30 is tilted, and Fig. 4(c) shows the state of the cam 20, the hammer block 30, the elastic member 40, and the disengagement mechanism 50 when the hammer block 30 strikes the inspection object. Figs. 4(a) to 4(c) are cross-sectional views of a cross section at a predetermined position between the main body 10 and the hammer block 30, as viewed from the main body 10 side.

[0032] 4(a), when the cam 20 and the trigger portion 33 are not in contact with each other, the hammer block 30 is not tilted. The first arm 42 of the elastic member 40 is fixed by being hung on the fixing pin 18, and the second arm 43 is hung on the stopper pin 15.

[0033] Next, as shown in FIG. 4(b), when the cam 20 rotates and the outer peripheral surface 22 of the cam 20 presses the trigger portion 33, the hammer block 30 rotates and tilts about the connecting shaft 17 (clockwise in FIG. 4(b)). At this time, the biasing force transmission pin 34 fixed to the hammer block 30 lifts the second arm portion 43. This applies a biasing force to the elastic member 40.

[0034] Next, as shown in Fig. 4(c), when the cam 20 further rotates and the step portion 21 passes the end of the trigger portion 33, the inclination of the hammer block 30 is eliminated and the hammer block 30 rotates (counterclockwise in Fig. 4(b)) due to the biasing force applied to the elastic member 40, and the hammer portion 32 collides with the surface to be inspected. This generates a hammering sound, which allows a hammering inspection to be performed.

[0035] At this time, the second arm 43 is received by the stopper pin 15, so that the biasing force transmission pin 34 and the elastic member 40 are separated from each other, and the engagement between the hammer block 30 and the elastic member 40 is released. Therefore, the hammer block 30 that has struck the inspection object bounces off the inspection object surface, and a slight gap can be created between the hammer portion 32 and the inspection object surface. Therefore, after striking the inspection object, the hammer block 30 (hammer portion 32) is not pressed against the inspection object surface.

[0036] By repeating this process, multiple areas of the object can be inspected.

[0037] 5 is a diagram showing a state when the impact device 1 according to the first embodiment is mounted on the automatic traveling device 100. For example, if the impact device 1 according to the first embodiment is mounted on the automatic traveling device 100 that can freely move on civil engineering structures such as railway bridges and tunnels, and on wall surfaces such as the exterior walls of large structures such as buildings and condominiums, it is possible to perform impact testing even in places that are out of reach of workers.

[0038] The automatic traveling device 100 can use any suitable device, and the following can be used. That is, the automatic traveling device 100 includes a mobile body 110 having an adhesion drive unit 111 and an unsupported running belt 112 that is suspended and driven by driven wheels and driving wheels, and can travel on a wall surface S while adhering to the wall surface S with the adhesion drive unit 111. By attaching an impact device 1 and a sound collection unit (e.g., a microphone, not shown) to the rear of the automatic traveling device 100, a hammering test can be performed while moving on the wall surface S.

[0039] For example, when there is a structure A such as a rain gutter, a drain pipe, a water pipe, an electric conduit, a gas pipe, or an air conditioner pipe, the automatic traveling device 100 approaches between the structure A and a wall surface S from the impact device 1 side, and the impact device 1 passes through the gap between the structure A and the wall surface S. Then, the hammer block 30 can be tilted and the hammer part can strike the wall surface. This makes it possible to perform a hammering inspection near the structure A, which could not be performed with a conventional impact device.

[0040] 3. Effects of the impact device 1 according to the embodiment According to the impact device 1 of the embodiment, the impact device 1 includes a cam 20 attached to a shaft 12 extending from a motor 11, a trigger unit 33 which is a contact provided at a position adjacent to the cam 20, and a hammer block 30 which has a hammer unit 32 for impacting an object to be inspected and is provided rotatably around a connecting shaft 17 extending from a main body unit 10. Therefore, the rotation of the cam 20 is transmitted to the hammer block 30 via the trigger unit 33, and the hammer unit 32 can impact the object to be inspected. Therefore, since it is not necessary to secure an area for sliding the hammer head by a solenoid as in the case of Patent Document 1, the height of the impact device can be reduced. Therefore, even if a structure such as a gutter or a drainage pipe is arranged with a small gap from the surface of the exterior wall, the impact device can pass through the gap and impact the object to be inspected.

[0041] Furthermore, according to the impact device 1 of the embodiment, it is equipped with an engagement release mechanism 50 that releases the engagement between the hammer block 30 and the elastic member 40 when striking the object to be inspected. Therefore, even when used in a case where there is only a small gap between the surface of the exterior wall and the structure, the hammer portion 32 is not pressed against the object to be inspected after striking the object to be inspected, and it is possible to prevent the impact sound from being attenuated.

[0042] Furthermore, according to the impact device 1 of the embodiment, the trigger portion 33 is a convex portion that protrudes from the hammer block 30 toward the main body portion 10, and as the cam 20 rotates, the trigger portion 33 is pushed in the outer circumferential direction centered on the connecting shaft 17, tilting the hammer block 30. In addition, a biasing force is applied to the hammer block 30 by the elastic member 40, so that the height of the impact device can be made lower compared to when the hammer head is slid.

[0043] In addition, in the impact device 1 according to the embodiment, the disengagement mechanism 50 is configured to include a stopper pin 15 extending from the main body 10 toward the hammer block 30 and a biasing force transmission pin 34 extending from the hammer block 30 toward the main body 10. When the hammer block 30 tilts due to the rotation of the cam 20, the biasing force transmission pin 34 lifts the second arm 43, and when the test object is struck, the second arm 43 is received by the stopper pin 15, thereby disengaging the hammer block 30 from the elastic member 40. With this configuration, it is possible to reliably prevent the hammer part 32 from being pressed against the test object when striking the test object. In addition, the hammer part bounces off the test object surface, forming a gap between the test object surface and the hammer part, thereby generating a tapping sound that is optimal for tapping inspection.

[0044] Furthermore, in the impact device 1 according to the embodiment, the center of gravity of the hammer block 30 overlaps with the area in which the cam 20 is disposed when viewed from the main body 10 side, so that the cam 20 and the hammer block 30 can be configured compactly while maintaining a sufficient biasing force to generate an impact sound. Therefore, it is not necessary to increase the height of the impact device in order to apply a biasing force to the hammer block 30.

[0045] Although the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment. It can be embodied in various forms without departing from the spirit of the present invention, and for example, the following modifications are also possible.

[0046] (1) The positions, connections, quantities, etc. described in the above embodiment are merely examples and can be changed without impairing the effects of the present invention.

[0047] (2) In the above embodiment, the impact device 1 is attached to the automatic traveling device 100 to strike the surface to be inspected, but the present invention is not limited to this. For example, the impact device 1 may be attached to an unmanned aerial vehicle such as a drone to strike the surface to be inspected, or may be attached to a handle and pressed against a wall or the like by an operator to strike the surface to be inspected, or may be struck by any other appropriate method.

[0048] (3) In the above embodiment, a torsion spring is used as the elastic member, but the present invention is not limited to this. A spring other than a torsion spring may be used as long as it applies a biasing force to the hammer block, or another elastic member such as rubber may be used.

[0049] (4) In the above embodiment, the trigger is located at the lower right of the hammer block when viewed from the main body, but the present invention is not limited to this. The trigger may be located at the lower left when viewed from the main body. In this case, the connecting shaft is located at the lower left of the hammer block, and the hammer is located at the lower right of the hammer block. The trigger may also be located on the upper side of the hammer block. [Explanation of symbols]

[0050] 1...impact device, 10...main body, 11...motor, 12...shaft, 13...power source, 14...mounting portion, 15...stopper pin, 16...wheel portion, 17...connecting shaft, 18...fixed pin, 20...cam, 21...step portion, 22...outer periphery, 30...hammer block, 31...hammer block main body, 32...hammer portion, 33...trigger portion, 34...force transmission pin, 35...weight pin, 36...pin, 40...elastic member (torsion spring), 41...coil portion, 42...first arm portion, 43...second arm portion, 50...disengagement mechanism, 100...automatic traveling device, 110...mobile body, 111...adsorption drive portion, 112...unsupported traveling belt, A...structure, S...wall surface

Claims

1. An impact device for impacting an object to be inspected to perform a predetermined inspection, A main body having a motor; a cam attached to a shaft extending from the motor; a hammer block having a trigger portion, which is a contact provided at a position adjacent to the cam, and a hammer portion for striking an object to be inspected, the hammer block being rotatably provided around a connecting shaft extending from the main body portion; An elastic member that applies a biasing force to the hammer block; and a disengagement mechanism for disengaging the hammer block from the elastic member when striking an object to be inspected.

2. The trigger portion is a protrusion that protrudes from the hammer block side toward the main body side, 2. The impact device according to claim 1, wherein the trigger portion is pushed in a direction away from the connecting shaft by rotation of the cam, thereby tilting the hammer block, and a biasing force is applied to the hammer block by the elastic member.

3. the elastic member is a torsion spring having a coil portion and a first arm portion and a second arm portion extending from the coil portion, the first arm portion being fixed; The disengagement mechanism includes: A stopper pin extending from the main body side toward the hammer block side; and a biasing force transmission pin extending from the hammer block side toward the main body side, When the hammer block is tilted by the rotation of the cam, the biasing force transmission pin lifts the second arm, 3. The impact device according to claim 2, wherein, when the inspection object is to be impacted, the engagement between the hammer block and the elastic member is released by receiving the second arm portion with the stopper pin.

4. 4. The impact device according to claim 1, wherein the center of gravity of the hammer block, as viewed from the main body side, overlaps with an area in which the cam is disposed.

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