JP5957254B2 - Photoelectric sensor - Google Patents

Description

  According to the present invention, a light transmitting unit (light projecting unit) and a light receiving unit are separately disposed, and a light receiving unit detects a change in the amount of received light due to generation of smoke or the like by a light beam projected from the light transmitting unit. The present invention relates to a photoelectric separation type sensor that performs monitoring, and more particularly to a photoelectric separation type sensor that has a cover locking mechanism for engaging a cover with the main body to improve the installation work efficiency of the main body.

  In the photoelectric separation type sensor, an optical signal projected from a light transmitting part equipped with a light emitting element such as a light emitting diode is detected by a light receiving part equipped with a light receiving element such as a photodiode, and based on a change in the amount of received light. Whether or not it is a fire.

  In such a photoelectric separation type sensor, the maximum monitoring distance corresponding to the distance between the light transmitting unit and the light receiving unit is about 100 m at the maximum. Therefore, it is necessary for the light transmitting unit and the light receiving unit to collect light by a lens or the like and amplify the optical signal.

  Furthermore, in order to properly receive the optical signal from the light transmitting unit on the light receiving unit side, it is necessary to adjust the optical axis during construction, and this optical axis adjustment is very important for fire detection accuracy. It becomes. Moreover, at the time of construction, wiring work for connecting electric wires for power supply and the like is also required. In the conventional photoelectric separation type sensor, for example, when adjusting the optical axis on the light transmission unit side, it is common to remove the cover of the light transmission unit main body.

  Also, depending on the installation environment, such as a gymnasium or factory, it may be possible to place the photoelectric separation type sensor at a high place such as 10-15 m above the ground. It was difficult to secure a place to put it. Therefore, there is a conventional apparatus having a configuration (mechanism for holding the cover) that allows the cover to be suspended from the main body of the light transmission unit so that the cover does not fall even when the cover is removed during adjustment of the optical axis. Yes (see, for example, Patent Document 1).

  In addition, there is a conventional device that includes a locking unit that is pivotally supported by the upper portion of the main body case and rotates at a predetermined position and stops at a predetermined position (for example, see Patent Document 2). Therefore, after removing the cover, the worker can adjust the optical axis by using the optical axis adjusting screw provided on the front surface of the main body without worrying about dropping of the cover.

Japanese Utility Model Publication No. 6-37988 JP 2001-202576 A

However, the prior art has the following problems.
In the work of installing the photoelectric separation type sensor in the field, a wire connection work (wiring work) for sending and receiving electrical signals and an optical axis adjusting work for sending and receiving optical signals are essential. As an example, the former electric wire connection work may be performed on the lower side of the main body, and the latter optical axis adjustment work may be performed on the upper side of the main body.

  Therefore, in order to efficiently perform these two types of work, the cover can be locked below the main body when performing the work on the upper side of the main body, and when performing the work on the lower side of the main body. It is desirable to be able to lock the cover above the body.

  However, in each of the prior arts disclosed in Patent Documents 1 and 2, although a mechanism capable of locking the cover of the main body is provided, it can be locked only in one way. For this reason, it is difficult to secure an area suitable for both the wire connection work and the optical axis adjustment work, and it is difficult to improve the work efficiency in both work.

  The present invention has been made in order to solve the above-described problems. A photoelectric device having a mechanism capable of changing the locking state of the cover portion with respect to the main body portion to a desired position according to the work content. It aims at obtaining a type separation type sensor.

In the photoelectric separation-type sensor according to the present invention, a pair of housings each including a main body and a cover that is detachably attached to the main body are disposed so that the light emitting element is one of the pair of housings. A photoelectric separation type sensor that monitors the presence or absence of smoke based on changes in the amount of light received by the light receiving element. The housing includes a first engaging portion and a second engaging portion provided in the main body portion, and a first engaged portion and a second engaged portion provided in the cover portion, and is detached. When the first engaged portion of the cover portion is engaged with the first engaging portion, the lower side of the main body portion is opened, and the second engaged portion of the removed cover portion is second engaged. cover when engaged with the part is configured so that the top side of the main body portion is opened, a pair of housing opposing direction When the cover surface facing the other housing is defined as the front surface when the cover is attached to the main body, the first engagement member provided on the cover is defined as the front-rear direction. The joint portion is provided at a position closer to the front surface in the front-rear direction than the second engaged portion .

  According to the photoelectric separation type sensor according to the present invention, a plurality of locked states are realized by a combination of two engaging parts provided in the main body part and two engaged parts provided in the cover part. By doing so, it is possible to obtain a photoelectric separation type sensor provided with a mechanism that can change the locking state of the cover part with respect to the main body part to a desired position according to the work content.

It is a block diagram which shows the photoelectric separation-type sensor in Embodiment 1 of this invention. It is an external view of the main-body part of the photoelectric separation-type sensor in Embodiment 1 of this invention. It is a figure for demonstrating the cover latching mechanism of the photoelectric separation-type sensor in Embodiment 1 of this invention. It is explanatory drawing which shows the 1st latching state in the photoelectric separation-type sensor of Embodiment 1 of this invention. It is explanatory drawing which shows the 2nd latching state in the photoelectric separation-type sensor of Embodiment 1 of this invention. It is explanatory drawing which shows the 3rd latching state in the photoelectric separation type sensor of Embodiment 1 of this invention.

  Hereinafter, preferred embodiments of the photoelectric separation type sensor of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a photoelectric separation-type sensor according to Embodiment 1 of the present invention. The photoelectric separation type sensor includes a light transmitting unit 10 and a light receiving unit 20. Here, the distance (monitoring distance) between the light transmitter 10 and the light receiver 20 is, for example, about 5 m to 100 m. The light beam projected from the light transmitting unit 10 is received by the light receiving unit 20, and the presence or absence of smoke is detected from the change in the amount of received light. In addition, when the area where smoke is desired to be detected covers a wide area, a plurality of such pairs of the light transmitting unit 10 and the light receiving unit 20 may be installed at intervals.

  The light receiving unit 20 is connected to the fire receiver 7 through the power line 3 and is supplied with power from the fire receiver 7. The light transmitting unit 10 is connected to the light receiving unit 20 via the synchronization line 5. The synchronization line 5 serves as both a power supply line and a communication line, and the light transmission unit 10 is supplied with power from the light receiving unit 20 via the synchronization line 5 and further communicates with the light receiving unit 20. That is, it is necessary to connect the power line 3 and the synchronization line 5 to the light transmitter 10 and the light receiver 20. Hereinafter, the power supply line 3 and the synchronization line 5 may be collectively referred to as electric wires.

  The light transmitting unit 10 and the light receiving unit 20 are respectively disposed in a pair of casings including a main body unit 40 and a cover unit 30 detachably attached to the main body unit 40. FIG. 2 is an external view of the housing of the photoelectric separation type sensor according to Embodiment 1 of the present invention. Here, the case corresponds to both the case of the light transmitting unit 10 and the case of the light receiving unit 20, and the cover locking mechanism of the present invention includes a case on the light transmitting unit 10 side, It can be used for any housing on the light receiving unit 20 side.

  The cover part 30 is formed of a front plate, an upper plate, a bottom plate, and both side plates, and has a box shape with only one surface opened. The front plate has a visible light cut filter at the top, and the position of the visible light cut filter is opposite to the light emitting element or the light receiving element of the optical bench 50 described later when the photoelectric separation type detector is provided in the field. It will be in the position. Moreover, the surface facing the front plate is open. The opening is substantially the same as the size of the main body 40, and the main body 40 to which the optical bench 50 is fixed is incorporated into the opening. In addition, the bottom plate of the cover part 30 has a shape in which the rear side is cut out by about half.

  The main body 40 includes a vertical flat plate fixed to a wall via a base (not shown) and a horizontal bottom plate 45 provided below the flat plate.

  FIG. 3 is a diagram for explaining a cover locking mechanism of the photoelectric separation-type sensor according to Embodiment 1 of the present invention. In FIG. 3, in order to focus on the description of the cover locking mechanism, which is a technical feature of the present invention, electrical components and optical components disposed in the main body are omitted.

  FIG. 3A is a perspective view showing a state where the cover 30 and the main body 40 are separated. The lateral width between both side plates of the cover part 30 is formed to be approximately the same as the lateral width of the main body part 40, and the cover part 30 is detachable from the main body part 40. Moreover, the cover part 30 and the main body part 40 can be fitted by bringing the inner surfaces of both side plates of the cover part 30 into contact with the outer peripheral surface of the main body part 40. Furthermore, if necessary, it can be fixed with screws.

  FIG. 3B shows a front view of the cover 30 and a cross-sectional view taken along the line AA. The cover portion 30 is a mechanism for locking the cover portion 30 with respect to the main body portion 40, and a first shaft 31 (corresponding to a first engaged portion) and a second shaft 32 (second engaged portion). Equivalent). Each of the first shaft 31 and the second shaft 32 is provided as a pair facing each other inside the both side plates of the cover portion 30 so as to project a predetermined amount, for example, 10 mm in the horizontal direction.

  The second shaft 32 is provided below the cover portion 30 and is provided at a position close to the rear end of the cover portion 30, that is, the wall (main body side), and when performing work on the upper side of the main body portion 40. The cover portion 30 is used to lock the cover portion 30 below the main body portion 40. On the other hand, the first shaft 31 is above the second shaft 32, is near the center with respect to the vertical direction of the cover portion 30, is provided behind the cover portion 30, and is located below the main body portion 40. It is used to lock the cover 30 above the main body 40 when performing the operation on the side. The second shaft 32 is provided behind the first shaft 31, that is, closer to the wall.

  FIG. 3C shows a front view and a side view of the main body 40. The main body 40 has a first hook 41 (corresponding to a first engaging portion) and a second hook 42 as a mechanism for engaging with the first shaft 31 or the second shaft 32 provided in the cover portion 30. (Corresponding to the second engaging portion) and a third hook 43 (corresponding to the third engaging portion). Each of the first hook 41 to the third hook 43, as shown in FIG. 3 (a), from both sides of the flat plate of the main body portion 40 in the horizontal direction from the rear to the front, in other words, A pair is provided on the wall surface substantially perpendicularly. Here, the hook has a shape having openings capable of holding the first shaft 31 and the second shaft 32 as described later.

  The second hook 42 is provided below the main body portion 40, more specifically, at the front ends of both side portions of the bottom plate 45. The second hook 42 is larger than the outer diameter of the second shaft 32, and the cover portion 30 can be locked below the main body portion 40 when working on the upper side of the main body portion 40. .

  On the other hand, the first hook 41 and the third hook 43 are provided at a position above the second hook 42. More specifically, an arm 44 that protrudes forward in the horizontal direction from the center of both side plates, which are flat plates of the main body 40, is provided, and a first hook 41 facing upward is provided at the tip of the arm 44. A third hook 43 facing downward is provided. The first hook 41 and the third hook 43 are larger than the outer diameter of the first shaft 31.

  The first hook 41 is used to lock the first shaft 31 of the cover portion 30 above the main body portion 40 when performing work on the lower side of the main body portion 40. Further, the third hook 43 engages the first shaft 31 of the cover portion 30 below the main body portion 40 with the main body portion 40 turned upside down at the time of wiring work before shipment at the factory. Used to stop (shaft stop).

  Therefore, the hook shape for engaging the third hook 43 with the shaft provided on the cover 30 side is upside down with respect to the first hook 41 and the second hook 42. Further, in the configuration shown in FIG. 3C, the first hook 41 and the third hook 43 are provided at the tip of one arm 44 in opposite directions. When the first shaft 31 is locked to the first hook 41 and the third hook 43, the first shaft 31 is put on the arm 44.

  Next, a combination of the first shaft 31 and the second shaft 32 provided on the cover portion 30 and the first hook 41 to the third hook 43 provided on the main body portion 40 provides a plurality of engagements. The technical features of the present application for realizing the state will be described with reference to the drawings.

  FIG. 4 is an explanatory diagram showing a first locking state in the photoelectric separation-type sensor according to Embodiment 1 of the present invention. The first locked state shown in FIG. 4 is, for example, a state in which the cover 30 is locked above the main body 40 (when the lower portion of the main body 40 is opened) when performing wiring work in the field. This is realized by engaging the first shaft 31 and the first hook 41.

  More specifically, the first shaft 31 and the first hook 41 are engaged with each other, and the edge of the bottom plate of the cover portion 30 comes into contact with the front surface portion of the optical bench 50 attached to the main body portion 40. The first locked state is realized. This first locking state is used, for example, when an electric wire is connected to the light transmitting unit 10 or the light receiving unit 20. The electric wire is connected to the lower end of the optical bench 50, and an opening is required in the lower portion of the main body 40. Therefore, the electric wire is easily connected in the first locked state.

  As described above, when the first shaft 31 and the first hook 41 are locked, an opening is formed in the lower portion of the main body portion 40 so that the wire connection work can be performed. At this time, as shown in FIG. 4B, the cover portion 30 is locked in a state inclined to the rear side, so that the electric wire connection work is easily performed.

  FIG. 5 is an explanatory diagram showing a second locking state of the photoelectric separation type sensor according to the first embodiment of the present invention. The second locking state shown in FIG. 5 is, for example, a state in which the cover 30 is locked below the main body 40 when the optical axis adjustment work is performed in the field (the upper portion of the main body 40 is opened). This is realized by engaging the second shaft 32 and the second hook 42 with the upper working space secured.

  As described above, when the second shaft 32 and the second hook 42 are locked, an opening is formed in the upper portion of the main body portion 40 so that the optical axis adjustment operation can be performed. Since the optical bench 50 is exposed in the second locked state, the operability is improved by using the second locked state when adjusting the optical axis for operating the front surface and the upper portion of the optical bench 50.

  In the prior art in which the cover is suspended as in the prior art document 1, the lower part of the main body 40 can be seen. However, in fact, when performing wiring work connected to the lower part of the optical bench 50, the suspended cover may be in the way, so that a sufficient working space cannot be secured and work efficiency deteriorates. It will be a factor.

  Further, as in the above-described Patent Document 2, in the conventional technique in which the cover is locked in the upper portion of the main body portion 40, the upper portion of the main body portion 40 becomes visible. However, when performing an actual optical axis adjustment operation or the like, especially when performing a coarse adjustment of the optical axis, when looking into a collimation hole (not shown) in the upper part of the optical bench 50, it is locked upward. The covered cover may be in the way, and a sufficient working space cannot be secured, which causes a reduction in working efficiency.

  On the other hand, in the first embodiment, the cover portion 30 can be locked in either one of the first locked state and the second locked state. As a result, an efficient work can be realized by changing the locking state according to the work so that an appropriate work space can be secured according to the contents of the work at the site.

  Moreover, FIG. 6 is explanatory drawing which shows the 3rd latching state in the photoelectric separation-type sensor of Embodiment 1 of this invention. The third locked state shown in FIG. 6 is, for example, in a state where the main body portion 40 is fixed upside down when performing wiring work before shipment in a factory, and the cover portion 30 is fixed to the main body portion 40. In a state where the lower part of the optical stand 50 is exposed (when the first and second locked states are aligned with the top and bottom, the lower part of the main body 40 is opened. And a state where a work space below the optical bench 50 is secured), and is realized by engaging the first shaft 31 and the third hook 43. Hereinafter, the third locking state will be described by aligning the first locking state and the second locking state with the top and bottom.

  By engaging the first shaft 31 and the third hook 43 and the edge of the upper plate of the cover portion 30 is in contact with the upper end of the flat plate of the main body portion 40, the third locking state is realized. ing. The third locking state is used when an electric wire is connected to the lower side of the optical bench 50 as in the first locking state. As described above, when the first shaft 31 and the third hook 43 are locked, an opening is formed in the lower portion of the main body portion 40 so that the electric wire connection work can be performed.

  By setting the cover portion 30 to the main body portion 40 in such a third locking state, it is possible to secure a work space necessary for wiring work or the like in the factory before shipment. The work efficiency can also be improved.

  As described above, according to the first embodiment, the casing serves as the cover locking mechanism, the first engaging portion and the second engaging portion provided in the main body portion, and the first engaging portion provided in the cover portion. An engaged portion and a second engaged portion are provided. Then, by engaging the first engaged portion of the removed cover portion with the first engaging portion, the lower side of the main body portion is opened, and the second engaged portion of the removed cover portion is changed to the second. By engaging with the engaging portion, the upper side of the main body portion is opened. As a result, an efficient work can be realized by changing the locking state according to the work so that an appropriate work space can be secured according to the contents of the work at the site.

  Furthermore, the housing includes a third engagement portion provided in the main body portion as a cover locking mechanism. And the lower part side of a main-body part is opened by engaging the 1st to-be-engaged part of the removed cover part with a 3rd engaging part in the state which turned the main-body part upside down. As a result, a work space necessary for wiring work and the like can be secured, and work efficiency in the factory before shipment can be improved.

  3 Power line, 5 Sync line, 7 Fire receiver, 10 Light transmitting part, 20 Light receiving part, 30 Cover part, 31 First axis (first engaged part), 32 Second axis (second engaged part) 40) main body, 41 first hook (first engaging portion), 42 second hook (second engaging portion), 43 third hook (third engaging portion), 44 arm, 45 Bottom plate, 50 optical bench.

Claims (2)

A pair of housings composed of a main body portion and a cover portion detachably attached to the main body portion are disposed to face each other, and a light emitting element is disposed on one of the pair of housings, and light is emitted from the light emitting element. In the photoelectric separation type sensor that is disposed on the other of the pair of housings and that monitors whether smoke is generated by a change in the amount of light received by the light receiving element,
The housing includes a first engaging portion and a second engaging portion provided in the main body portion, and a first engaged portion and a second engaged portion provided in the cover portion, and is detached. When the first engaged portion of the cover portion is engaged with the first engaging portion, the lower side of the main body portion is opened and the second engaged portion of the cover portion is removed. When the portion is engaged with the second engaging portion, the upper side of the main body is configured to be opened ,
The direction in which the pair of housings face each other is defined as the front-rear direction of the cover, and the cover surface that faces the other housing facing the cover is defined as the front surface when the cover is attached to the main body. In this case, the first engaged portion provided in the cover portion is provided closer to the front surface in the front-rear direction than the second engaged portion. Separate sensor. A pair of housings composed of a main body portion and a cover portion detachably attached to the main body portion are disposed to face each other, and a light emitting element is disposed on one of the pair of housings, and light is emitted from the light emitting element. In the photoelectric separation type sensor that is disposed on the other of the pair of housings and that monitors whether smoke is generated by a change in the amount of light received by the light receiving element,
The housing includes a first engaging portion and a second engaging portion provided in the main body portion, and a first engaged portion and a second engaged portion provided in the cover portion, and is detached. When the first engaged portion of the cover portion is engaged with the first engaging portion, the lower side of the main body portion is opened and the second engaged portion of the cover portion is removed. When the portion is engaged with the second engaging portion, the upper side of the main body is configured to be opened ,
The housing further includes a third engagement portion provided in the main body, and the first engaged portion of the cover portion removed in the state where the main body is turned upside down. A photoelectric separation-type sensor , wherein the lower part of the main body is opened when engaged with an engaging part .

Images