JP3526814B2 - Explosion-proof camera - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof camera.

[0002]

2. Description of the Related Art To monitor the safety of plants and facilities that handle combustible gases and liquids such as petroleum, chemicals, steel, electric power, gas, etc., install a surveillance camera in the place where combustible gases and liquids exist. Need to be installed. For this reason, an industrial television (ITV) having an explosion-proof function for preventing an explosion or a fire caused by an electric circuit of the camera is used for the surveillance camera.

6 and 7 show an example of a conventional explosion-proof camera. This explosion-proof camera includes a housing 10 having a camera 100 and a camera mount 101 shown in FIG.
2, a housing cover 103 and a connection box 106 internally having a terminal block 105 to which the cable 104 shown in FIG. 6 is connected.

The camera 100 is attached to the camera mount 101 by removing the rear cover 110 of the housing 102, removing the screws 107 fixing the camera mount 101, and pulling the camera mount 101 forward. After returning this into the housing 102, the screws 107 are fixed again, and a plurality of wiring cables (not shown) of the camera 100 are connected to female connectors (not shown) inside the housing 102, respectively. Further, the cable 104 from the outside is drawn into the connection box 106 through the cable introduction port 108 provided in the connection box 106, the connection box lid 109 is removed, and the cable 104 is connected to a predetermined portion of the terminal block 105 in the middle part.

[0005]

However, in the above-mentioned conventional apparatus, when wiring is connected, the wiring cable from the camera side is connected to the connector in the housing, while the connection box lid of the connection box is removed to remove the cable. There was a problem that the wiring work was complicated because the cable had to be inserted from the inlet and connected to the terminal block. Further, since a commercially available ordinary camera itself is housed in the housing, it is large in size. Furthermore, the conventional explosion-proof ITV has a housing,
The price per unit, including the separately sold camera and the separately sold camera lens, is very expensive.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a device which is easy to wire, small and inexpensive.

[0007]

As means for solving the above problems, the present invention is a board camera comprising a lens portion and a substrate portion, and a U-shaped metal plate, and the substrate portion of the board camera. A board camera holder attached to the front side and the inside of the U-shape via a strut, a terminal block attachment attached to the rear side of the board camera holder, and a rear side attached to the terminal block attachment, A camera assembly including a terminal block connected to a board camera, a housing body that accommodates the camera assembly from the front end side, a cap attached to the front end of the housing body and having a window glass, and a rear end side of the housing body. Fixed to a wiring cable that is attached to the housing body and is connected to the terminal block with a certain length. It is made of a lamp.

(Operation) In the above invention, since the wiring cable fixed by the clamp has a certain predetermined length, it becomes easy to perform the mounting work outside the housing when connecting to the terminal block of the camera assembly. . In addition, a board camera consisting of a lens part and a board part, a board camera holder with the board camera attached to the front side,
Since the camera assembly is housed in the housing body by the terminal block mounting tool and the terminal block mounted on the rear surface side of the terminal block mounting tool, compared to a commercially available camera assembly that houses the camera body in the housing body. It becomes a small and inexpensive device.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an explosion-proof camera according to the present invention. This device comprises a camera assembly 1, a housing body 2, a cap 3 and a clamp 4.

The camera assembly 1 comprises a board camera 5, a board camera holder 6, a terminal block attachment 7, a terminal block 8 and a shield plate 9. The board camera 5 is a general C including a lens portion 10 and a substrate portion 11 which are integrated.
Any board type color camera integrated with a CD camera may be used. The board camera holder 6 is a U-shaped metal plate having ears 6a and 6b at both ends, and is attached to the rear side of the board camera 5 via a column 12. The terminal block attachment 7 is a U-shaped metal plate and is integrally screwed to the rear surface of the board camera holder 6.

As shown in FIG. 3, the terminal block 8 is attached to the rear surface side of the terminal block attachment 7 with screws 18. Further, the terminal block 8 has a first terminal mounting portion 15 and a second terminal mounting portion 16 on its side surface. The first terminal mounting portion 15 is inserted into a camera wiring 14 which is connected to a board camera connector 13 provided on the rear surface side of the board portion 11 of the board camera 5 to insert the terminal block 8 and the board. The camera 5 is connected. A wiring cable 17 from the outside is inserted into the second terminal mounting portion 16 to connect the wiring cable 17 and the camera wiring 14. Also,
On the rear surface side of the terminal block 8, there are formed holes 19 in which screws (not shown) for fixing the camera wiring 14 and the wiring cable 17 to the terminal block 8 are accommodated.

The shield plate 9 is provided on the front side of the board camera 5 with the ears 6a of the board camera holder 6,
It is attached with a screw 21 to the cylindrical head portion 20a of the fixing screw 20 inserted through 6b. When viewed from the front side, the shielding plate 9 has a donut shape so that other members constituting the camera assembly 1 cannot be seen except the lens portion 10.

The housing body 2 is made of a cylindrical aluminum alloy whose front end is open and whose rear end is closed.
A male screw portion 24 and a collar 25 are provided on the outer surface of the front end, and an O-ring 22 is provided on the front surface side of the collar 25. On the inner surface of the front end of the housing body 2, there is a step portion 26, and a screw hole 27a into which the fixing screw 20 is screwed is formed in the step portion 26. Further, screw holes 27b and 27c for mounting the clamp 4 described later are formed at the rear end and the side surface of the housing body 2. The cap 3 is made of a short cylindrical aluminum alloy having openings at both ends, a window glass 23 is attached to the front end, and a female screw portion to which a male screw portion 24 at the front end of the housing body 2 is screwed is attached to the inner surface of the rear end. 28 is formed.

The clamp 4 is composed of the housing body 2
It is a general pressure-resistant packing-type retractable metal fitting that is attached to the screw holes 27b and 27c, has a packing inside, and fixes the power cable 29 and the video cable 28.

Next, a procedure for connecting a cable to the explosion-proof camera having the above structure will be described.

At the site where the explosion-proof camera is used, first, the cap 3 is removed from the housing body 2, and the screw 2
1 is removed and the shielding plate 9 is removed from the fixing screw 20. Then, the fixing screw 20 is removed, and the camera assembly 1 is removed from the housing main body 2, and the state shown in FIG. 2 is obtained. Next, the clamp 4 is removed from the housing body 2, and the power cable 29 and the video cable 30 are attached to the clamp 4 as shown in FIG.
It is inserted so as to have a sufficient length to reach the camera assembly 1 in such a state, and a terminal treatment such as stripping the wire core of each wiring cable 17 by about 9 mm is performed. The wiring cables 17 that have undergone terminal processing are connected to the terminal blocks 8 in the extended state as shown in FIG.
As shown in, the wiring cable 17 is fixed to the predetermined second terminal mounting portion 16 by a screw inside the screw hole 19, and is connected to the camera wiring 14 in the terminal block 8.

As shown in FIG. 1, the wiring cable 17 is folded inside the housing body 2, the camera assembly 1 to which the wiring cable 17 is connected is received from the front end opening of the housing body 2, and the housing body 2 is fixed with a fixing screw 20. Fixed to. Next, the shielding plate 9 is fixed to the cylindrical head portion 20a with the screw 21, and the cap 3 is attached to the housing body 2
Screw from the front side. Finally, the clamp 4 is fixed to the housing body 2 to fix the power cable 29 and the video cable 30.

Further, as another procedure for connecting the cable, the following may be performed. Unlike the above method, this method is performed without taking out the camera assembly 1 from the housing body 2. First, as shown in FIG. 4, the clamp 4 is packaged separately from the housing main body 2, and the sleeves at the ends of the power supply wiring cable 17a and the video wiring cable 17b of the wiring cable 17 are screwed into the screw holes 27.
It is kept out of the housing body 2 through b and c.

The mounting portion 4a and the seal portion 4c of the clamp 4 are separated from each other, and the setscrew 4d and the screw 4e for fixing the tightening portion 4b screwed to the mounting portion 4a are loosened, and the power cable 2
9 and the video cable 30 are attached to the mounting portion 4a and the fastening portion 4 respectively.
b, insert into the seal portion 4c. The cores of the power cable 29 and the video cable 30 are subjected to terminal treatment, inserted into the sleeves of the wiring cables 17a and 17b, and crimped using a crimping tool.

The power cable 29 and the video cable 30 are pushed into the inside of the housing body 2 together with the wiring cable 17 up to the outer skin, and the mounting portion 4a is screwed into the screw hole 27c.
After screwing on b, tighten the set screw 4f to fix the mounting part 4a
Is attached to the housing body 2. Next, the tightening portion 4b is screwed into the mounting portion 4a, and the set screw 4d is tightened and fixed. Then, tighten the screw 4e to tighten the power cable 29.
After fixing the video cable 30 to the tightening portion 4b, the seal portion 4c is screwed into the mounting portion 4a.

Further, as another procedure for connecting the cables, the following may be performed. For the above procedure,
This procedure is performed without taking out the wiring cable 17 from the housing body 2. As shown in FIG. 5, a panel 31 is provided inside the housing body 2 to partition the housing body 2 into a front chamber and a rear chamber. On the rear room side of the panel 31, a terminal block 31a and a female BNC are provided.
The connector 31b is provided, and the power supply wiring cable 17a and the video wiring cable 17b of the wiring cable 17 are respectively from the front side of the panel 31 to the terminal block 31a and the female type B.
It is connected to the NC connector 31b. The female BN
An L-shaped BNC connector 32 is attached to the C connector 31b. Further, two connector plugs 4a are attached to the side surface of the housing body 2 instead of the clamp 4 described above. A screw-in type back cover 33 is detachably attached to the rear end of the housing body 2.

At the site where the explosion-proof camera is used, the back cover 33 is first removed from the housing body 2, the connector plug 4a is removed, and the power cable 29 and the video cable 30 are inserted. The power cable 29 and the video cable 30 are respectively connected to the holes 3 of the connector plug 4a.
4 to the inside of the housing body 2. Terminal treatment is applied to the cores of the power cable 29 and the video cable 30,
The power cable 29 is connected and fixed to the terminal block 31a, while the video cable 30 is attached to the L-shaped BNC connector 32 removed from the female BNC connector 31b.
The connector 32 is connected to the female BNC connector 31b. Then, the power cable 29 and the video cable 30 are pulled back to the outside, and after bending the power cable 29 and the video cable 30 in the rear room, the connector plug 4a is tightened and fixed. The back cover 33 is screwed and fixed to the housing body 2.

[0024]

As is apparent from the above description, according to the present invention, the cable fixed by the clamp has a certain predetermined length, so that when the cable is connected to the terminal block of the camera assembly, the housing It will be easier to install on the outside. Further, since the camera assembly is housed in the housing body by forming the camera assembly with the board camera, the board camera holder, the terminal block attachment and the terminal block, the size of the camera assembly is smaller than that of a commercially available device that houses the camera body in the housing body. And it becomes an inexpensive device.

[Brief description of drawings]

FIG. 1 is a side sectional view of an explosion-proof camera according to an embodiment of the present invention.

FIG. 2 is an exploded view of FIG.

FIG. 3 is a perspective view showing a state in which the wiring cable of FIG. 1 is connected to a camera assembly.

FIG. 4 is a diagram showing a state when the cable of FIG. 1 is connected.

5 is a diagram showing a state in which the cable of FIG. 1 is connected.

FIG. 6 is a partially cutaway side view of a conventional explosion-proof camera.

FIG. 7 is a front view of FIG.

[Explanation of symbols]

1 Camera Assembly 2 Housing Body 3 Cap 4 Clamp 5 Board Camera 6 Board Camera Holder 7 Terminal Block Fixture 8 Terminal Block 10 Lens Part 11 Board Part 17 Wiring Cable 23 Window Glass

Claims (2)

(57) [Claims] 1. A board camera comprising a lens portion and a substrate portion, and a board having a U-shaped metal plate, wherein the substrate portion of the board camera is attached to a front side and an inner side of the U-shape through a column. A camera assembly comprising a camera holder, a terminal block attachment attached to the rear side of the board camera holder, and a terminal block attached to the rear side of the terminal block attachment and connected to the board camera; A housing main body that is accommodated from the front end side, a cap that is attached to the front end of the housing main body and has a window glass, and a cap that is attached to the rear end side of the housing main body and that is inserted into the housing main body and is the terminal block. Explosion-proof camera consisting of a clamp that fixes the wiring cable that is connected with a length. 2. The apparatus according to claim 1, wherein a shield plate is provided on the front side of the board camera.