JP7372123B2 - Sound pressure measurement device - Google Patents

Description

The present invention relates to a sound pressure measuring device that measures the sound pressure of a sound emitted from a speaker installed as a warning device at a railroad crossing, for example.

Conventionally, the function of speakers installed outdoors, such as railroad crossing alarms, has often been inspected periodically by maintenance personnel (see, for example, Patent Document 1). . In the inspection work described in Patent Document 1, maintenance personnel use a sound pressure sensor to measure the sound pressure of the sound emitted by the speaker, thereby inspecting the functionality of the speaker.

Japanese Patent Application Publication No. 2016-175444

Here, in the periodic function inspection, the function of the speaker cannot be confirmed until the inspection time has come, and there is room for improvement in terms of quick response to a decline in the function of the speaker. In order to ensure such quick response, we are considering installing sound pressure sensors near existing speakers so that maintenance personnel can measure sound pressure at any time without actually visiting the installation site. It will be done. However, in many cases, in order to install a sound pressure sensor, the current situation is that a structure for installing the sensor must first be attached near the speaker. In addition to the high cost of parts for such structures, many outdoor speakers, such as railroad crossing alarms, are installed at high places, making it extremely difficult to install them near them. There's a problem.

Therefore, the present invention focuses on the above-mentioned room for improvement, and provides a sound pressure measurement device that can be installed while reducing parts costs and installation work for the purpose of measuring sound pressure on existing speakers at any time. The purpose is to provide.

In order to solve the above problems, the sound pressure measuring device of the present invention includes a sound pressure sensor that measures the sound pressure of a sound emitted by a speaker installed on the upper end side of a columnar object, and a sound pressure sensor that measures the sound pressure of the sound emitted by a speaker installed on the upper end side of a columnar object, and a a holding part that holds a portion of the horn by sandwiching the sound pressure sensor and holds the sound pressure sensor toward the inside of the horn; A control unit that supplies power to the sensor and converts the output voltage of the sound pressure sensor into a signal representing the sound pressure and sends it to a predetermined receiving device; and the sound pressure sensor and the control unit are connected electrically. A relay cable is connected to the control unit and relays power supply from the control unit to the sound pressure sensor and voltage output from the sound pressure sensor to the control unit.

According to the sound pressure measurement device of the present invention, the sound pressure of the sound emitted by the speaker can be measured at any time using the sound pressure sensor held toward the inside of the speaker's horn. Furthermore, the sound pressure sensor can be held by a holding part that can be easily attached by holding a part of the opening edge of the horn, without using other structures that require parts costs. I can do it. In this manner, the sound pressure measuring device of the present invention can be installed while reducing parts costs and installation work for measuring sound pressure on a speaker at any time.

Here, in the sound pressure measuring device of the present invention, the holding section has an elastic member that contacts the opening edge and deforms following the shape of the opening edge, and the It is preferred to grasp a portion.

According to this configuration, by using the elastic member that deforms to follow the shape of the opening edge of the horn, the holding portion can be made to grip a portion of the opening edge side of various speakers having different horn shapes. can. That is, according to the above configuration, the sound pressure measuring device can be attached to such various speakers.

Further, in the sound pressure measurement device of the present invention, the holding portion has a clamp in which one of the pair of gripping pieces approaches or separates from the other by tightening or loosening a screw, and the clamp allows the It is also suitable to grasp a portion.

According to this configuration, the sound pressure measuring device can be firmly attached to the speaker using the above-mentioned clamp that provides high attachment strength.

Further, in the sound pressure measurement device of the present invention, it is also preferable that the holding part has a spring clip in which one of a pair of gripping pieces is biased by a spring against the other, and the part is gripped by the spring clip. It is.

According to this configuration, the sound pressure measuring device can be attached to the speaker even more easily using the spring clip, which is very easy to attach.

Further, in the sound pressure measuring device of the present invention, the speaker is installed on the upper end side of the columnar object, and is installed at a position below the speaker in the columnar object, and supplies power to the sound pressure sensor, and A control unit that converts the output voltage of the sound pressure sensor into a signal representing the sound pressure and sends it to a predetermined receiving device; the sound pressure sensor and the control unit are electrically connected; It is also preferable to include a relay cable that relays power supply to the sound pressure sensor and voltage output from the sound pressure sensor to the control unit.

According to this configuration, the control unit that performs power supply, signal conversion, and signal transmission is installed at a position below the speaker at a position such as the upper end of the columnar object that cannot be easily accessed by maintenance personnel. As a result, tasks that tend to be more frequent than maintenance of sound pressure sensors, such as battery replacement when batteries are used as a power source and maintenance of circuits related to signal processing, can be easily performed at the lower position. It can be carried out. In addition, since the sound pressure sensor and control unit are connected by wire using a relay cable rather than wirelessly, even if the sound pressure sensor becomes detached from the speaker due to some reason, dissipation of the sound pressure sensor is suppressed. be able to.

Further, in this configuration, it is more preferable that the relay cable is fixed to the columnar object between the sound pressure sensor and the control unit.

This configuration is preferable because the sound pressure sensor that has come off the speaker can be kept as close to the speaker as possible by the relay cable fixed to the columnar object.

Further, in the sound pressure measurement device of the present invention, it is also preferable that the speaker is an alarm installed at a railroad crossing.

According to this configuration, by installing the sound pressure measurement device in the loudspeakers used as alarms at railroad crossings, where there is a high demand for sound pressure measurement at any time and there are many of them, it is possible to reduce the cost of parts and the labor of installation work. It can be used effectively.

According to the sound pressure measurement device of the present invention, it is possible to install the sound pressure measurement device of an existing speaker at any time by reducing the cost of parts and the effort of installation work.

FIG. 1 is a schematic diagram showing a railroad crossing where a sound pressure measuring device according to a first embodiment of the present invention is installed. FIG. 2 is a perspective view showing a sound pressure sensor and a holding part in the sound pressure measuring device shown in FIG. 1 together with a speaker that is a target for sound pressure measurement. FIG. 3 is a diagram showing the sound pressure sensor and holding portion shown in FIG. 2 together with a cross section along the line V11-V11 in FIG. 1 of the speaker horn. FIG. 3 is a perspective view of the sound pressure sensor and the holding portion shown in FIG. 2, viewed from the sound collection side of the sound pressure sensor facing inside the horn. FIG. 5 is a plan view of the sound pressure sensor and the holding portion shown in FIG. 2, viewed from the sound collection side of the sound pressure sensor as indicated by arrow V12 in FIG. 4. FIG. 5 is a bottom view of the sound pressure sensor and holding portion shown in FIG. 2, viewed from below as indicated by arrow V13 in FIG. 4. FIG. 5 is a sectional view showing a cross section of the sound pressure sensor and holding portion shown in FIG. 2 taken along line V14-V14 in FIG. 4. FIG. FIG. 7 is a perspective view showing a sound pressure sensor and a holding part in a sound pressure measuring device according to a second embodiment of the present invention, together with a speaker that is a target for sound pressure measurement. 9 is a diagram showing the sound pressure sensor and holding portion shown in FIG. 8 together with a cross section of the speaker horn taken along line V21-V21 in FIG. 8. FIG. FIG. 9 is a perspective view of the sound pressure sensor and the holding portion shown in FIG. 8 when viewed from the sound collection side of the sound pressure sensor facing inside the horn. 11 is a plan view of the sound pressure sensor and the holding portion shown in FIG. 10, viewed from the sound collection side of the sound pressure sensor as indicated by arrow V22 in FIG. 10. FIG. 11 is a side view of the sound pressure sensor and holding section shown in FIG. 10, viewed from the side as indicated by arrow V23 in FIG. 10. FIG.

First, a sound pressure measuring device according to a first embodiment of the present invention will be described.

FIG. 1 is a schematic diagram showing a railroad crossing where a sound pressure measuring device according to a first embodiment of the present invention is installed.

The level crossing 1 shown in FIG. 1 is equipment installed at various locations on the railway line, and includes a pillar 11, a level crossing barrier 12, a speaker 13 as an alarm, a level crossing equipment box 14, and a sound pressure measurement device. A device 100 is provided. The columnar object 11 is a support column installed at the railroad crossing 1, and supports the railroad crossing barrier 12 and the speaker 13. The level crossing barrier 12 prevents people and vehicles from entering the railroad tracks by lowering the barrier 12a when a train passes. The speaker 13 is installed on the upper end side of the columnar object 11, and is played before and after the train passes to emit an alarm sound. The level crossing equipment box 14 is installed next to the columnar object 11, collects various information regarding monitoring of the level crossing 1, and exchanges the information with a predetermined monitoring server. The sound pressure measuring device 100 measures the sound pressure of the sound emitted by the speaker 13 in order to check the function of the speaker 13, and wirelessly transmits the measurement result to the railroad crossing equipment box 14.

Although not shown in FIG. 1, the columnar object 11 of the level crossing 1 includes, in addition to the level crossing barrier 12, the speaker 13, and the sound pressure measuring device 100, a signal and a display that displays the passing status of trains. A device, an emergency stop button device, etc. may be supported.

The sound pressure measuring device 100 includes a sound pressure sensor 110, a holding section 120, a control unit 130, and a relay cable 140. The sound pressure sensor 110 measures the sound pressure of the sound emitted by the existing speaker 13. The holding portion 120 holds the sound pressure sensor 110 toward the inside of the horn 13a of the speaker 13, as will be described later. The control unit 130 is installed at a position below the speaker 13 on the columnar object 11, supplies power to the sound pressure sensor 110, converts the output voltage of the sound pressure sensor 110 into a signal representing sound pressure, and transmits the signal to the receiving device. The information is sent wirelessly to the railroad crossing equipment box 14 as a railroad crossing equipment box. The relay cable 140 electrically connects the sound pressure sensor 110 and the control unit 130, and relays power supply from the control unit 130 to the sound pressure sensor 110 and voltage output from the sound pressure sensor 110 to the control unit 130. This relay cable 140 is fixed to the columnar object 11 by a predetermined fastening member 141 between the sound pressure sensor 110 and the control unit 130. The sound pressure measurement device 100 is generally configured as described above. Hereinafter, the sound pressure sensor 110 and the holding part 120 in this sound pressure measuring device 100 will be explained in detail.

FIG. 2 is a perspective view showing a sound pressure sensor and a holding part in the sound pressure measuring device shown in FIG. 1, together with a speaker that is the object of sound pressure measurement. FIG. 3 is a diagram showing the sound pressure sensor and the holding portion shown in FIG. 2 together with a cross section along the line V11-V11 in FIG. 1 of the speaker horn.

As shown in FIGS. 2 and 3, the holding part 120 in the sound pressure measuring device 100 holds a portion 13c of the horn 13a of the speaker 13 on the opening edge 13b side, and also holds the sound pressure sensor. 110 is held toward the inside of the horn 13a. This holding section 120 holds the sound pressure sensor 110 using a mechanism as described below.

FIG. 4 is a perspective view of the sound pressure sensor and the holding portion shown in FIG. 2, viewed from the sound collection side of the sound pressure sensor facing inside the horn. FIG. 5 is a plan view of the sound pressure sensor and the holding portion shown in FIG. 2, viewed from the sound collection side of the sound pressure sensor as shown by arrow V12 in FIG. Moreover, FIG. 6 is a bottom view of the sound pressure sensor and the holding part shown in FIG. 2, viewed from below as shown by arrow V13 in FIG. FIG. 7 is a cross-sectional view of the sound pressure sensor and holding portion shown in FIG. 2 taken along line V14-V14 in FIG.

First, as shown in FIG. 7, the sound pressure sensor 110 includes a sound collecting board 112 fixed with screws 113 and housed inside a case 111 having a mounting flange 111a. A microphone element 114 is mounted on the sound collecting board 112 on the side opposite to the sound collecting side, and the sound is transmitted through the cap 115 provided on the sound collecting side of the case 111 and the through hole 112a of the sound collecting board 112. To detect. Further, this cap 115 is provided with a humidity control vent as a through hole that communicates with the inside and outside of the case 111, and is configured to keep the humidity inside and outside of the case 111 at approximately the same level. A cable connector 116 is attached to the outer peripheral surface of the case 111, as shown in FIGS. 4 to 6. An output voltage corresponding to the sound detected by the microphone element 114 is sent to the control unit 130 via a relay cable 140 (FIG. 1) connected to the cable connector 116.

A holding section 120 that holds this sound pressure sensor 110 includes a clamp 121 and a connecting plate 122. The clamp 121 includes a main body portion 121a having a substantially C-shape in side view, and a hexagonal bolt 121b (screw). By tightening or loosening the hexagonal bolt 121b, the tip portion 121b-1 of the hexagonal bolt 121b approaches or separates from the upper arm portion 121a-1 of the substantially C-shaped main body portion 121a. The tip 121b-1 of the hexagonal bolt 121b corresponds to one of a pair of gripping pieces that sandwich and grip a portion 13c of the horn 13a on the opening edge 13b side. Further, the arm portion 121a-1 of the main body portion 121a corresponds to the other of the pair of gripping pieces.

Further, an elastic sheet 121c made of rubber is attached to the horn 13a side of the arm 121a-1 of the main body 121a, and an elastic cap 121d also made of rubber is placed on the tip 121b-1 of the hexagonal bolt 121b. ing. The elastic sheet 121c and the elastic cap 121d both contact a portion 13c of the horn 13a on the opening edge 13b side and deform to follow the shape of the portion 13c. The clamp 121 in the holding part 120 grips the above-mentioned portion 13c of the horn 13a via the pair of elastic members, namely the elastic sheet 121c and the elastic cap 121d, by tightening the hexagonal bolt 121b.

The connecting plate 122 in the holding part 120 is formed into a rectangular plate shape, the sound pressure sensor 110 is fixed to one end side with four screws 123, and the clamp 121 is fixed to the other end side with two screws 123. The sound pressure sensor 110 and the clamp 121 are connected by this connection plate 122, and the sound pressure sensor 110 and the holding part 120 are integrated. Further, as shown in FIG. 7, the connecting plate 122 also plays the role of closing the opening of the case 111 of the sound pressure sensor 110, which has a cylindrical shape with a bottom on the sound collecting side. An O-ring 124 is sandwiched between the case 111 and the connecting plate 122 to maintain watertightness.

In the sound pressure measuring device 100 described above, the holding part 120 integrated with the sound pressure sensor 110 is attached to the horn 13a of the speaker 13 by tightening the hexagonal bolt 121b using a hexagonal wrench. Then, as shown in FIG. 1, the control unit 130 fixed to the columnar object 11 and the sound pressure sensor 110 held by the holding part 120 are connected by a relay cable 140, and the relay cable 140 is fastened. It is fixed to the columnar object 11 by a member 141. The installation of the sound pressure measurement device 100 is completed by a series of these operations.

According to the sound pressure measurement device 100 of this embodiment, the sound pressure sensor 110 held toward the inside of the horn 13a of the speaker 13 can measure the sound pressure of the sound emitted by the speaker 13 at any time. The sound pressure sensor 110 can be held by the holding part 120, which can be easily attached by holding the part 13c of the horn 13a on the side of the opening edge 13b. This can be done without using . In this way, the sound pressure measuring device 100 of the present embodiment can be installed while reducing parts costs and installation work for measuring the sound pressure of an existing speaker 13 at any time.

Here, in this embodiment, the holding part 120 holds a portion 13c of the horn 13a via an elastic sheet 121c and an elastic cap 121d that contact the opening edge 13b and deform to follow the shape of the opening edge 13b. grasp. According to this configuration, the above-mentioned holding part 120 can be made to hold the portion 13c on the opening edge 13b side of various speakers 13 having different shapes of the horn 13a through the elastic sheet 121c and the elastic cap 121d. That is, according to the above configuration, the sound pressure measurement device 100 can be attached to such various speakers 13.

Further, in this embodiment, the holding part 120 grips a portion 13c of the horn 13a with a clamp 121 in which one of a pair of gripping pieces approaches or separates from the other by tightening or loosening a hexagonal bolt 121b. . According to this configuration, the sound pressure measuring device 100 can be firmly attached to the speaker 13 using the above-mentioned clamp 121 that provides high attachment strength.

Further, in this embodiment, the speaker 13 is installed on the upper end side of the columnar object 11, and the relay cable electrically connects the control unit 130 installed below the speaker 13, the sound pressure sensor 110, and the control unit. 140 are provided. According to this configuration, the control unit 130 that performs power supply, signal conversion, and signal transmission is installed at a position below the speaker 13 at a position such as the upper end of the columnar object 11 that cannot be easily accessed by maintenance personnel. This makes it easier to perform tasks that tend to be more frequent than maintenance of the sound pressure sensor 110, such as battery replacement when batteries are used as a power source and maintenance of circuits related to signal processing, for example, at the lower position. can be done. Furthermore, since the sound pressure sensor 110 and the control unit 130 are connected by wire using a relay cable 140 instead of wirelessly, even if the sound pressure sensor 110 becomes disconnected from the speaker 13 for some reason, the sound pressure Dissipation of the sensor 110 can be suppressed.

Further, in this embodiment, the relay cable 140 is fixed to the columnar object 11 between the sound pressure sensor 110 and the control unit 130. This configuration is preferable because the sound pressure sensor 110 that has come off the speaker 13 can be kept as close to the speaker 13 as possible by the relay cable 140 fixed to the columnar object 11.

Further, in this embodiment, the speaker 13 serves as a warning device installed at the railroad crossing 1. According to this configuration, by installing the sound pressure measurement device 100 on the speaker 13 as a warning device of the railroad crossing 1, which has a high demand for sound pressure measurement at any time and is numerous in number, the cost of parts and the labor of installation work can be reduced. This effect can be effectively utilized.

Next, a sound pressure measuring device according to a second embodiment of the present invention will be described. In this second embodiment, the structure of the holding part in the sound pressure measuring device is different from the above-described first embodiment. On the other hand, the structure of the sound pressure measurement device other than the holding part, the railroad crossing as the installation location of the sound pressure measurement device, etc. are the same as in the first embodiment. In the following, the sound pressure measuring device according to the second embodiment will be described with attention to the differences from the first embodiment, and illustrations and descriptions of the same points will be omitted. In addition, in the following description, the constituent elements of FIG. 1 shown for a railroad crossing 1 and the like equivalent to those in the first embodiment will be appropriately referred to.

FIG. 8 is a perspective view showing a sound pressure sensor and a holding part in a sound pressure measuring device according to a second embodiment of the present invention, together with a speaker that is the object of sound pressure measurement. FIG. 9 is a diagram showing the sound pressure sensor and the holding portion shown in FIG. 8 together with a cross section along the line V21-V21 in FIG. 8 of the speaker horn. In addition, in FIGS. 8 and 9, the same reference numerals as in FIGS. 2 and 3 are given to components equivalent to those of the first embodiment shown in FIGS. 2 and 3, and below, Duplicate explanations of these equivalent components will be omitted.

As shown in FIGS. 8 and 9, in the present embodiment as well, the holding part 220 in the sound pressure measurement device 200 grips the horn 13a of the speaker 13 by sandwiching a portion 13c on the side of the opening edge 13b. . The holding part 220 holds the sound pressure sensor 110 facing inside the horn 13a. This holding section 220 holds the sound pressure sensor 110 using a mechanism as described below.

FIG. 10 is a perspective view of the sound pressure sensor and the holding portion shown in FIG. 8, viewed from the sound collection side of the sound pressure sensor facing inside the horn. FIG. 11 is a plan view of the sound pressure sensor and the holding portion shown in FIG. 10, viewed from the sound collection side of the sound pressure sensor as shown by arrow V22 in FIG. Moreover, FIG. 12 is a side view of the sound pressure sensor and the holding portion shown in FIG. 10, viewed from the side as shown by arrow V23 in FIG. In addition, in FIGS. 10 to 12, the same reference numerals as in FIGS. 2 and 3 are given to the same components as those of the first embodiment shown in FIGS. 4 to 6, and below, Duplicate explanations of these equivalent components will be omitted.

In this embodiment, the holding part 220 includes a clip fixing part 221 integrally molded with the lower side of the peripheral wall of the bottomed cylindrical case 111 of the sound pressure sensor 110, and a center clip 222. Note that in this embodiment, the cable connector 116 in the sound pressure sensor 110 is provided in the left-right direction opposite to that in the above-described first embodiment when viewed from the front as shown in FIG. 11, for example. However, since the sound pressure sensor 110 of this embodiment is substantially the same as that of the first embodiment, in FIGS. It is shown with "110" attached.

The eyeball clip 222 is a spring clip in which one of a pair of gripping pieces 222a, 222a-1, is biased against the other 222a-2 by a spring 222b (FIG. 12). Of the pair of knobs 222c having an eyeball-like shape in this eyeball clip 222, the upper knob 222c-1 connected to the other 222a-2 is fixed to the clip fixing part 221 by a bolt 223. As a result, the sound pressure sensor 110 and the eyeball clip 222 are connected, and the sound pressure sensor 110 and the holding part 220 are integrated.

Further, in this embodiment, the opening of the case 111 of the sound pressure sensor 110 having a bottomed cylindrical shape with the sound collecting side as the bottom is closed by the closing plate 224 . This closing plate 224 is fixed to the mounting flange 111a of the case 111 with four screws 225, and between the case 111 and the closing plate 224, there is an O2 (not shown) that seals the space between the two to maintain watertightness. The ring is stuck.

In the sound pressure measuring device 200 described above, the holding part 220 integrated with the sound pressure sensor 110 is attached to the horn 13a of the speaker 13 with the eye clip 222. Then, similarly to the first embodiment, the control unit 130 fixed to the columnar object 11 in FIG. Fixed. The installation of the sound pressure measuring device 200 is completed by this series of operations.

Similarly to the first embodiment, the sound pressure measurement device 200 of the second embodiment can also be used to measure the sound pressure of the speaker 13 at any time by reducing the cost of parts and the effort of installation work, and using the existing speaker 13. Needless to say, it can be installed in

Further, in this embodiment, the holding section 220 grips a portion 13c of the horn 13a with an eyeball clip 222 serving as a spring clip. According to this configuration, the sound pressure measuring device 200 can be attached to the speaker 13 even more easily using the eyeball clip 222, which is very easy to attach.

Note that the first and second embodiments described above merely show typical forms of the present invention, and the present invention is not limited thereto. That is, various modifications can be made without departing from the gist of the invention. Such modifications are of course included within the scope of the present invention as long as they still have the structure of the sound pressure measuring device of the present invention.

For example, in the first and second embodiments described above, the sound pressure measurement devices 100 and 200 that are installed at a railroad crossing 1 and measure the sound pressure of a speaker 13 serving as a warning device are exemplified. However, the sound pressure measurement device of the present invention is not limited to this, and may be used to measure the sound pressure of speakers for other purposes, such as speakers for community broadcasts installed for disaster prevention, communication, etc. Good too. However, by installing the sound pressure measurement device 100 on the loudspeaker 13 as a warning device at the railroad crossing 1, where there is a high demand for sound pressure measurement at any time and there are many of them, the effect of reducing the cost of parts and the effort of installation work can be effectively achieved. The points that can be utilized are as mentioned above.

Further, in the first and second embodiments described above, the sound pressure measurement devices 100 and 200 are illustrated in which the sound pressure sensor 110 is rigidly connected to the clamp 121 and the eyeball clip 222 (spring clip). However, the sound pressure measurement device of the present invention is not limited to this. For example, the sound pressure sensor may be connected to a member such as a clamp or a spring clip via a bendable joint structure or the like. . By adopting such a configuration, it becomes possible to adjust the orientation of the sound pressure sensor.

Further, in the first embodiment described above, the sound pressure measuring device 100 is illustrated in which the holding section 120 grips a portion 13c of the horn 13a via an elastic member such as an elastic sheet 121c or an elastic cap 121d. However, as illustrated in the second embodiment, the sound pressure measuring device of the present invention is not limited to this, and may be configured to grip a portion of the horn without using an elastic member. However, as described above, the sound pressure measuring device 100 can be attached to various speakers by gripping the portion 13c of the horn 13a via an elastic member. Note that the material and shape of the elastic member are not limited to those exemplified in the first embodiment, such as rubber, sheet shape, or cap shape, and can be appropriately set according to the installation situation. Further, its installation is not limited to being provided both inside and outside the horn 13a as exemplified in the first embodiment, but may be provided only either inside or outside. Furthermore, in the second embodiment described above, a configuration is exemplified in which the eyeball clip 222 (spring clip) in the holding part 220 grips a part of the horn without using an elastic member, but when a spring clip is used in the holding part. However, it may also be gripped via an elastic member.

Furthermore, in the first and second embodiments described above, the sound pressure measuring devices 100 and 200 are illustrated in which the holding parts 120 and 220 have the clamp 121 and the eyeball clip 222 (spring clip). However, the sound pressure measuring device of the present invention is not limited to this, and may be any device that grips a portion of the horn of a speaker on the opening edge side and holds the sound pressure sensor toward the inside of the horn. , it does not ask about its specific form. However, as described above, by using the clamp 121 on the holding part 120, the sound pressure measuring device 100 can be firmly attached to the speaker 13. Further, as described above, by using the eyeball clip 222 (spring clip) on the holding portion 220, the sound pressure measuring device 200 can be attached to the speaker 13 more easily. Note that the clamp used for the holding part is not limited to the clamp 121 whose specific shape etc. is illustrated in the first embodiment, and the spring clip used for the holding part also has the specific shape etc. shown in the second embodiment. is not limited to the eyeball clip 222 illustrated. Even when a clamp or a spring clip is used for the holding part, the specific form of the member can be set as appropriate.

Further, in the first and second embodiments described above, the sound pressure measuring device 100 is illustrated in which the clamp 121 in the holding part 120 is provided with a hexagonal bolt 121b that can be tightened or loosened with a general hexagonal wrench. . However, even if the sound pressure measurement device of the present invention uses a clamp, it is not limited to this. Good too. By using such a special screw clamp, the sound pressure sensor can be prevented from being stolen.

Furthermore, in the first and second embodiments described above, the sound pressure measuring devices 100 and 200 are illustrated as including the control unit 130 and the relay cable 140 installed at a position below the speaker 13 in the columnar object 11. . However, the sound pressure measuring device of the present invention is not limited to this, and may have a form in which the sound pressure sensor itself has a built-in power supply and signal processing/sending function, for example, without having a control unit or relay cable. . However, by providing the control unit 130 and the relay cable 140 separately from the sound pressure sensor 110, maintenance etc. can be easily performed and dissipation can be suppressed when the sound pressure sensor 110 is removed from the speaker 13. The points to be considered are as described above.

Furthermore, in the first and second embodiments described above, the sound pressure measuring devices 100 and 200 in which the relay cable 140 is fixed to the columnar object 11 by the fastening member 141 are illustrated. However, the sound pressure measurement device of the present invention is not limited to this, and may have a form in which the relay cable is not fixed to a columnar object. However, as mentioned above, by fixing the relay cable 140 to the columnar object 11, the sound pressure sensor that has come off the speaker can be kept as close to the speaker as possible by the relay cable fixed to the columnar object. . Note that even when the relay cable is fixed to a columnar object, the specific form of fixing can be set as appropriate.

1 Level crossing 11 Column 12 Level crossing barrier 12a Blocking rod 13 Speaker 13a Horn 13b Opening edge 13c Part 14 Level crossing instrument box 100, 200 Sound pressure measuring device 110 Sound pressure sensor 111 Case 111a Mounting flange 112 Sound collecting board 112a Through hole 113 , 123, 225 Screw 114 Microphone element 115 Cap 120, 220 Holding section 121 Clamp 121a Main body section 121a-1 Arm section 121b Hexagonal bolt (screw)
121b-1 Tip 121c Elastic sheet (elastic member)
121d Elastic cap (elastic member)
122 Connecting plate 124 O-ring 130 Control unit 140 Relay cable 141 Fastening member 221 Clip fixing part 222 Eye clip (spring clip)
222a Pair of gripping pieces 222a-1 One 222a-2 Other 222b Spring 222c Pair of knobs 222c-1 Upper knob 223 Bolt 224 Closure plate

Claims (6)

a sound pressure sensor that measures the sound pressure of the sound emitted by a speaker installed on the upper end side of the columnar object ;
a holding part that holds and holds a portion of the opening edge side of the horn of the speaker, and holds the sound pressure sensor toward the inside of the horn;
It is installed in a lower position than the speaker in the columnar object and is easily accessible by maintenance personnel, and supplies power to the sound pressure sensor and converts the output voltage of the sound pressure sensor into a signal representing the sound pressure. a control unit that transmits the data to a predetermined receiving device;
a relay cable that electrically connects the sound pressure sensor and the control unit and relays power supply from the control unit to the sound pressure sensor and voltage output from the sound pressure sensor to the control unit;
A sound pressure measuring device characterized by comprising: The sound according to claim 1, wherein the holding part has an elastic member that contacts the part and deforms to follow the shape of the part, and grips the part via the elastic member. Pressure measurement device. Claim characterized in that the holding part has a clamp in which one of a pair of gripping pieces approaches or separates from the other by tightening or loosening a screw, and the part is gripped by the clamp. 2. The sound pressure measuring device according to 1 or 2. The sound according to claim 1 or 2, wherein the holding part has a spring clip in which one of a pair of grip pieces is biased by a spring against the other, and the part is gripped by the spring clip. Pressure measurement device. The sound pressure measuring device according to claim 1 , wherein the relay cable is fixed to the columnar object between the sound pressure sensor and the control unit. The sound pressure measuring device according to any one of claims 1 to 5 , wherein the speaker is a warning device installed at a railroad crossing.

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