JP2000055893A - Hammering-sound generation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hammering-sound generation apparatus which is suitable for a hammering inspection and judgment device by which an inside volume filled into a container such as a can, a PET bottle or the like, the appearance (the dent or the like) of the can, the hardness or the viscosity of bean curd, yoghurt or the like and the very small crack or the like of a brake pad, a roof tile or the like are analyzed (of inspected) on the basis of a hammering sound. SOLUTION: A hammering-sound generation apparatus is used to inspect an object, to be inspected, by using a hammering sound. In the apparatus, a hammer 2 which hits the object to be inspected is proivided, a shaft 5 which is fixed to the hammer 2 is provided, a drive part 4 which drives the shaft 5 and which gives a prescribed force to the hammer 2 is provided, and a return spring 7 which is attached to the shaft 5 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the contents of cans, PET bottles, and other containers, the appearance of cans (such as dents), the hardness and viscosity of tofu, yogurt, and the like, as well as brake pads and tiles. The present invention relates to a tapping sound generation device suitable for a tapping sound inspection / judgment device for analyzing (inspection) minute cracks and the like by a tapping sound.

[0002]

2. Description of the Related Art At present, a skilled worker hits a container with a hammer or the like to inspect the contents of a container or a plastic bottle, etc. Inspection / judgment of damage status is performed.
In addition, the worker similarly determines whether there is a minute crack or the like such as a brake pad or a tile by listening to the striking sound.

[0003]

However, in the above-described hammering sound inspection, since a worker performs subtle changes in sound with his / her ear, the operation requires skill and the inspection efficiency is improved. Has limitations. Also, in distinguishing the striking sound, it is necessary to pay attention to the working environment so that the surrounding noise and the like do not influence. On the other hand, the present inventors have already extracted a characteristic of a signal from various input signals, and determined the state of the input signal based on the characteristic (Japanese Patent Application No. 9-3429).
No. 45) and its effectiveness has been confirmed.

[0004] The present invention uses the above-mentioned waveform diagnostic apparatus or the like to measure the internal capacity of containers such as cans and PET bottles, the appearance of cans (such as dents), the hardness and viscosity of tofu and yogurt, and the like. It is an object of the present invention to provide a tapping sound generating device suitable for a tapping sound inspection / determination device capable of accurately judging minute cracks and the like of a brake pad, a tile, etc. by a tapping sound. According to the present invention, it is possible to automate the tapping sound inspection and improve the working efficiency. In addition, by adopting a mechanism that directly hits the test object, it is possible to inspect all the test objects, and it is possible to configure a light and compact tapping sound generating device, and to easily attach it to existing production equipment. It becomes possible.

[0005]

SUMMARY OF THE INVENTION Accordingly, a technical solution taken by the present invention is a tapping sound generating apparatus for inspecting an object to be inspected using a tapping sound. A hammer, a shaft fixed to the hammer, and a driving unit that drives the shaft to apply a predetermined force to the hammer,

A hitting sound generating apparatus for inspecting an object to be inspected using a tapping sound, said apparatus comprising: a hammer for hitting the object to be inspected; a shaft fixed to the hammer; A drive unit 4 for applying a predetermined force to the hammer;
A return sound attached to the shaft;

A hitting sound generating apparatus for inspecting an object to be inspected using a tapping sound, the apparatus including a hammer for hitting the object to be inspected, and a drive unit for applying a predetermined force to the hammer. Wherein the hammer comprises a head and an elastic body supporting the head, and the driving unit includes a driving mechanism for imparting a predetermined speed to the head of the hammer, wherein the hitting sound generating device,

A hitting sound generating device for inspecting an object to be inspected by using a hitting sound, wherein the hitting sound generating device includes a shaft operated by a driving device, a shock absorber holding member attached to the shaft, and a shock absorber. A spring material (leaf spring) attached to the shaft slightly away from the material holding member, a cushioning material is arranged between the cushioning material holding member and the spring material, and a head is attached to the tip of the spring material. It is a tapping sound generating device characterized by comprising

A hitting sound generating device for inspecting an object to be inspected using a tapping sound, said device comprising: a shaft operated by a driving device; and a spring material attached to the shaft. The material is composed of two spring materials having both ends fixed, and is fixed to the shaft at the center of one spring material 15, and a head is attached to the approximate center of the other spring material by appropriate means. A hitting sound generating device characterized in that a cushioning material is attached between them.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a sound generating apparatus according to an embodiment of the present invention. FIG. 1 is an external view of the tapping sound generating device, and FIG. 2 is a sectional view of the tapping sound generating device in a stationary state. Hammering inspection using the hammering equipment
A schematic configuration of the determination device will be described. 1 is a hammering sound generating device according to the present invention, 2 is a hammer of the hammering sound generating device, 3 is a hammering sound collecting microphone provided on the hammering sound generating device, and 21 is a hammering sound generating device. A sensor 22 for operation, a hitting sound determination device 22 for inspecting / determining the hitting sound generated by the hitting sound generating device, and a reference numeral 23 for a test object (for example, a can) placed on a belt conveyor 24. In the tapping sound inspection / judging device, when the sensor 21 detects an object to be inspected, the tapping sound generating device 1 is operated at an appropriate timing via a control circuit (not shown), and the hammer 2
Hits the test object 23 with. Then, the tapping sound at this time is collected by the microphone 3, and the tapping sound determination device 22 performs the tapping sound determination to determine the internal capacity of the test object.

The sensor 21 uses a known sensor, and the hitting sound judging device 22 can use various waveform judging devices currently in practical use. The use of the waveform diagnosis device enables more accurate waveform diagnosis.

FIG. 2 is an enlarged sectional view of the hitting sound generating device in a stationary state, in which 2 is a hammer provided at the tip of a shaft, 4 is a solenoid type driving unit for driving the hammer 2,
5 is a shaft, 6 and 6 are bearings, 7 is a return spring, and 8 is a casing. The shaft 5 is slidably supported by a bearing 6 provided in the casing 8. A return spring 7 is disposed on the shaft 5, and the hammer 2 is always in an initial state by the action of the return spring 7 as shown in FIG. 2. Further, the casing 8 is provided with a microphone 3 for collecting a tapping sound generated when the user hits the hammer 2. The microphone 3 does not necessarily need to be attached to the casing 8 and may be arranged at a position where the tapping sound can be reliably collected. Also, the return springs 7 can be arranged at a plurality of positions on the shaft 5 as necessary.

The operation of the hitting sound generating device having the above-described configuration will be described. When the sensor 21 detects an object 23 (eg, can) placed and moving on the belt conveyor 24,
A predetermined current flows through the solenoid 4 by a control circuit (not shown), and the shaft 5 instantaneously moves rightward in FIG. 2 against the urging force of the return spring 7 and strikes the test object 23.
The striking sound at this time is detected by the microphone 3, and the striking sound determination device 22 determines the waveform of the striking sound.
3 is determined. The hammering force of the hammer 2 can be set in advance for each hammering device, but the strength of the current flowing through the solenoid 4 can be controlled to reduce the hammering force. It is also possible to select freely.

The hitting sound generator 1 is suitable for various test objects by attaching a hammer 2 to the tip of a shaft 5 operated by a solenoid 4 and freely setting a tapping force according to the strength of the solenoid 4. A hitting force can be obtained, and accurate hitting sound determination can be performed. In the above example, the solenoid 5 is used as the drive unit of the shaft 5, but a drive unit that can obtain a striking force by releasing the force accumulated in the spring at a time can be used. Of course, any other form can be used as long as it can generate instantaneous axial movement of the shaft 5.

Next, a modified example (embodiment) of the hammer 2 constituting the tapping sound generating device will be described with reference to FIGS. Each of the second and third embodiments is a system in which the hitting force is obtained by using the weight of the head. In the case of FIGS. 3 and 4, the head is light in weight and a light hitting force can be obtained. 5 and 6, the weight of the head is heavy and a relatively large hitting force can be obtained. At the same time, the kinetic energy immediately before the head accelerated by the drive unit 4 collides with the inspection object 23 is determined by the mass and speed of the head 14 and the reaction force due to the bending of the cushioning material holding member 11 in FIGS. This is independent of the weight and condition of the shaft 5 and the return spring 7. 5 and 6, the mass and speed of the head 14 and the spring members 15, 1
6 is determined by the reaction force due to the bending. As described above, the impact force that collides with the inspection object 23 can be determined regardless of the weight of the member that accelerates the head 14 and the like.
The most suitable striking force for knowing the structural defects and the like can always be stably maintained.

In FIGS. 3 and 4, reference numeral 8 denotes a casing of the tapping sound generator, and the casing 8 has a built-in drive unit for the shaft 5 similar to the above-described tapping sound generator. A buffer material holding member 11 having a predetermined length is attached to the shaft 5 protruding from the casing 8. The elastic body 12 having the same size is fixed. In this example, a leaf spring is used as the elastic body, but a member having another similar function (for example, a rubber material or a rod-shaped member) may be used. A cushioning material 13 held by the cushioning material holding member 11 is arranged between the cushioning material holding member 11 and the spring material 12, and a head 14 is attached to a tip of the spring material 12. In this example,
Although the cushioning material holding member 11 is formed of an aluminum material, other materials can be used.

In this hitting sound generating device, when the shaft 5 is momentarily moved downward to generate a hitting sound, the spring material 12 is bent as shown in FIG. When the head 14 moves downward and strikes the test object, and the head 14 returns to the initial position by the spring member 12, the impact force of the head 14 can be absorbed by the cushioning member 13. The provision of the cushioning material 13 prevents vibration of the head 14. In this embodiment, the tapping force can be reduced because a light head is used. Note that the cushioning material can be attached to the hammer side if necessary.

In the embodiment shown in FIGS. 5 and 6, the center of one side elastic body 15 of elastic bodies 15 and 16 whose both ends are connected to the shaft 5 projecting from the casing 8 by appropriate means such as screws is fixed. A heavy head 14 is attached to a substantially central portion of the side elastic body 16 by appropriate means, and a cushioning material 13 is attached between the elastic bodies 15 and 16. In this example, two leaf springs are used as the elastic body, but any other material (such as a bar-shaped spring material) can be used as long as it can perform the same function.

In this hitting sound generating device, when the shaft 5 moves downward, the head 14 attached to the lower spring material 16 moves downward while bending the spring materials 15 and 16 by the reaction at this time, and When the head 14 returns to the initial position by the spring members 15 and 16,
4 can be absorbed.
In this type, a heavy head can be used, so that the hitting force can be increased.

FIGS. 7 and 8 show an example of a use state of the tapping sound generating apparatus according to the present invention. FIG. 7 shows an inspection of the inspection object 23 on the belt conveyor. The test object is detected by the signal, and at the same time the test object comes below the tap sound generating device, the tap sound generating device is driven to generate a tap sound. The tapping sound at this time is collected by a microphone and determined by a controller including a tapping sound determination unit. FIG. 8 shows a simplified type for inspecting cans one by one. The hitting sound generator is attached to a stand 20. The inspection object is inspected by placing the can of the inspection object below the hitting sound generating device and generating a tapping sound for each can. In this form, continuous processing is not possible, but since the apparatus is small, it can be used easily anywhere. As described above, according to the present invention, it is possible to provide a hitting sound generating device capable of obtaining a hitting force suitable for an object to be inspected, so that various inspections of the object to be inspected can be realized. In addition, the present invention may be embodied in various other ways without departing from the spirit and essential characteristics thereof.

[0021]

As described in detail above, according to the present invention, a direct hitting mechanism is employed, so that the material to be inspected is not selected, and is lightweight, compact, easy to carry, and can be attached to existing production equipment. Eliminates the need for a skilled person who can easily recognize subtle changes in sound. Work efficiency is improved. It is possible to accurately determine the striking sound even in the surrounding noise. Since the impact force that collides with the inspection object can be determined regardless of the weight of the member that accelerates the head, the optimal impact force for knowing the structural defect of the inspection object is always stably maintained. And excellent effects can be achieved.

[Brief description of the drawings]

FIG. 1 is an external view of a tapping sound generating device.

FIG. 2 is a sectional view of the hitting sound generating device of FIG. 1 in a stationary state.

FIG. 3 is a configuration diagram of a hammer 2 according to a second embodiment.

FIG. 4 is an operation diagram of a hammer 2 according to a second embodiment.

FIG. 5 is a configuration diagram of a hammer 2 according to a third embodiment.

FIG. 6 is an operation diagram of a hammer 2 according to a third embodiment.

FIG. 7 is an example showing a use state of the tapping sound generating device according to the present invention, in which a test object on a belt conveyor is inspected.

FIG. 8 is an example showing a use state of the tapping sound generating device according to the present invention, in which a test object is individually inspected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hammer generator 2 Hammer 3 Microphone 4 Driving means 5 Shaft 6 Bearing 7 Return spring 8 Casing 11 Buffer material holding member 12, 15, 16 Spring material 13 Buffer material 14 Head

Claims (5)

[Claims] 1. A hitting sound generating apparatus for inspecting an object to be inspected using a tapping sound, said apparatus comprising: a hammer for hitting the object to be inspected; a shaft fixed to the hammer; And a driving section for applying a predetermined force to the hammer. 2. A hitting sound generating apparatus for inspecting an object to be inspected using a tapping sound, said apparatus comprising: a hammer for hitting the object to be inspected; a shaft fixed to the hammer; And a drive unit for applying a predetermined force to the hammer, and a return spring attached to a shaft. 3. A hitting sound generating apparatus for inspecting an object to be inspected using a tapping sound, said apparatus comprising: a hammer for hitting the object to be inspected; and a driving unit for applying a predetermined force to the hammer. Wherein the hammer comprises a head and an elastic body supporting the head, and the drive section comprises a drive mechanism for imparting a predetermined speed to the head of the hammer. 4. A tapping sound generating device for inspecting an object to be inspected using a tapping sound, wherein the device includes a shaft operated by a driving device, a cushioning material holding member attached to the shaft, A spring material (leaf spring) attached to a shaft slightly away from the cushioning material holding member; a cushioning material is disposed between the cushioning material holding member and the spring material; A hitting sound generating device characterized by being attached with. 5. A hitting sound generating device for inspecting an object to be inspected using a tapping sound, said device comprising: a shaft operated by a driving device; and a spring member attached to the shaft. The spring member is composed of two spring members joined at both ends. The spring member is fixed to the shaft at the center of one spring member, and the head is attached to the approximate center of the other spring member by appropriate means. A hitting sound generating device characterized by attaching a cushioning material between materials.