JPH0980606A - Explosion-proof industrial monitor camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an explosion-proof industrial monitor camera easily wired, with wiring easily detachable at the time of maintenance. SOLUTION: An explosion-proof industrial monitor camera used in a dangerous atmosphere is provided with an explosion-proof container 2, a camera 1 provided in the explosion-proof container 2 and having a focus adjusting function, a focus adjusting means, and a connector part 51. The focus adjusting means is composed of a shaft 4 fixed to a focus adjusting screw 6, provided outside of the explosion-proof container 2, so as to transmit the rotary motion of the focus adjusting screw 6 to the inside of the explosion-proof container 2, and a belt 3 for transmitting the rotary motion of the shaft 4 to the focus adjusting function of the camera 1. The connector part 51 is provided with a first contact pin 15 provided in the explosion-proof container 2, with the input-output of the camera 1 connected thereto, and a second contact pin 16 with each distribution cable 12a of a composite cable 13a connected thereto. The connector part 51 connects the first and second contact pins 15, 16 by screwing a detachable means into the explosion-proof container 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof industrial surveillance camera used in a dangerous place such as a process plant, and particularly, an explosion-proof industrial surveillance camera capable of focusing in a dangerous atmosphere and having easy wiring. Regarding

[0002]

2. Description of the Related Art When a surveillance camera is installed in a place such as a process plant where explosive gas or vapor is present, an explosion-proof structure is adopted to prevent an explosion or a fire caused by the surveillance camera.

FIG. 2 shows "Japanese Patent Application No.
FIG. 23 is a plan view showing an example of a conventional explosion-proof industrial surveillance camera described in “No. 232364”. In FIG. 2, 1 is a camera having a focus adjustment function, 2 is an explosion-proof container, 3 is a belt, 4 and 5 are shafts, 6 is a focus adjustment screw, 7 and 8 are connectors, 9 is a rear cover, 10 is a stopper, 11 Reference numerals 12 and 12 are wiring cables, and 13 is a composite cable.

However, the wiring port of the rear cover 9 is shown in FIG.
The diameter of the middle "a" portion is larger than the outer diameter of the connector 8. Further, 3 to 6 constitute the focus adjusting means 50.

The camera 1 and the shaft 4 are installed inside the explosion-proof container 2 by means not shown, and the shaft 5 is installed through the wall of the explosion-proof container 2 while maintaining the explosion-proof state of the explosion-proof container 2.
One side of the belt 3 is hung around the focus adjustment ring of the camera 1, and the other side of the belt 3 is hung around one end of the shaft 4.

The other end of the shaft 4 and one end of the shaft 5 are engaged with each other by a gear or the like, and a focus adjusting screw 6 is provided at the other end of the shaft 5. The wiring cable 11 of the camera 1 is connected to the connector 7.

A stopper 10 is attached to the rear cover 9,
The composite cable 13 from the outside passes through the inside of the stopper 10. Once inside the rear cover 9, the composite cable 13 is divided into wiring cables 12, which are connected to the connector 8.

Further, the rear cover 9 is attached to the explosion-proof container 2 while connecting the connector 8 and the connector 7.

The operation of the conventional example shown in FIG. 2 will be described. When the focus adjusting screw 6 is rotated by a tool such as a screwdriver, the shaft 5 rotates, and the shaft 4 meshing with the shaft 5 also rotates. This rotational movement is transmitted by the belt 3, and the focus adjustment ring of the camera 1 rotates, so that the focal length of the camera 1 changes.

As a result, by providing the focus adjusting means 50 capable of adjusting the focus while maintaining the explosion-proof state of the explosion-proof container 2, the focus of the camera 1 can be adjusted without touching the camera 1 even in a dangerous atmosphere. become.

Further, since the diameter of the wiring port of the rear cover 9 shown in FIG. 2B is larger than the outer diameter of the connector 8, the wiring cable is already fed from the wiring port of the rear cover 9 shown in FIG. After inserting the connector 8 to which 12 is attached and connecting the connector 8 and the connector 7, the rear cover 9 is attached to the explosion-proof container 2 and further the plug 10 is attached to facilitate wiring work at the installation site. .

As a result, by making the diameter of the wiring port of the rear cover 9 larger than the outer diameter of the connector 8, the terminal treatment at the installation place becomes unnecessary and the wiring work becomes easy.

[0013]

However, in the conventional explosion-proof industrial surveillance camera, when the wiring is temporarily removed during maintenance, the play of the wiring cable 12 is small, so that the rear cover 9 is simply loosened from the explosion-proof container 2. The length of the wiring cable 12 is limited, and it becomes difficult to remove the connector 8 from the connector 7. That is, there is a problem that the wiring cannot be removed unless the plug 10 is removed even during maintenance.
Therefore, it is an object of the present invention to realize an explosion-proof industrial surveillance camera that is easy to wire and easy to attach and detach during maintenance.

[0014]

In order to achieve such an object, according to the present invention, in an explosion-proof industrial surveillance camera used in a dangerous atmosphere, an explosion-proof container and a focus provided inside the explosion-proof container. A camera having an adjusting function, a shaft fixed to a focus adjusting screw provided outside the explosion-proof container and transmitting the rotational movement of the focus adjusting screw inside the explosion-proof container, and a rotational movement of this shaft of the camera. Focus adjusting means comprising a belt that is transmitted to the focus adjusting function,
By providing a first contact pin provided in the explosion-proof container to which the input / output of the camera is connected and a second contact pin to which each wiring cable of the composite cable is respectively connected, and by screwing the detaching means into the explosion-proof container. And a connector unit for coupling the first and second contact pins to each other.

[0015]

[Function] By unifying the connector part and screwing the union cover into the explosion-proof container to connect the male contact pin and the female contact pin, wiring work at the installation site becomes easy, and wiring can be removed even during maintenance. It will be easier.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration plan view showing an embodiment of an explosion-proof industrial surveillance camera according to the present invention. Here, 1 to 6 have the same reference numerals as those in FIG.

In FIG. 1, 11a and 12a are wiring cables, 13a is a composite cable, 14 is a male terminal block, and 15 is a male terminal block.
Is a plurality of male contact pins, 16 is a plurality of female contact pins, 17 is a female terminal block, 18 is a wiring terminal block, 1
Reference numeral 9 is a union cover which is a detaching means, 20 is a connector case, 21 is a clamp cover, 22 is pressure resistant packing, and 2
3 is a cable clamp. Further, 12a, 13a and 16 to 23 form a connector portion 51.

The camera 1 and the shaft 4 are installed inside the explosion-proof container 2 by means not shown, and the shaft 5 is installed through the wall of the explosion-proof container 2 while maintaining the explosion-proof condition of the explosion-proof container 2.
One side of the belt 3 is hung around the focus adjustment ring of the camera 1, and the other side of the belt 3 is hung around one end of the shaft 4.

The other end of the shaft 4 and one end of the shaft 5 are engaged with each other by a gear or the like, and a focus adjusting screw 6 is provided at the other end of the shaft 5. The wiring cable 11 a of the camera 1 is connected to the plurality of male contact pins 15 via the male terminal block 14.

On the other hand, the composite cable 13a from the outside passes through the inside of the clamp cover 21 and the connector case 20, respectively.
It is divided into the wiring cables 12a that constitute 3a.

This wiring cable 12a is a wiring terminal block 1
8 and a female-side terminal block 17 to be connected to a plurality of female contact pins 16, respectively.

The clamp cover 21 and the female terminal block 17 are attached to the connector case 20, and the connector case 20 is attached to the explosion-proof container 2 by the union cover 19.

Further, a pressure-proof packing 22 is arranged between the composite cable 13a and the connector case 20, and the cable clamp 23 compresses the pressure-proof packing 22.

The operation of the embodiment shown in FIG. 1 will be described. However, the focus adjustment operation is the same as that of the conventional example shown in FIG.

Female terminal block 17 at the very first installation
Is removed from the connector case 20, and the composite cable 13
The a is passed through the crank cover 21, the cable clamp 23, and the pressure-proof packing 22 and guided into the connector case 20.

The composite cable 13a guided into the connector case 20 is divided into a plurality of wiring cables 12a and subjected to terminal treatment such as crimping of a crimp terminal or the like, and the wiring cables 12a subjected to the terminal treatment are respectively wired. Terminal block 1
It is fixed to 8 by screwing or the like.

Thereafter, the female terminal block 17 is attached to one side of the connector case 20, and the cable clamp 23 is screwed into the other side of the connector case 20 to compress the pressure resistant packing 22, and the clamp cover 21 is also attached to the connector case 20. Install on the other side of.

At this point, the components 12a, 13a and 16-23 of the connector section 51 are integrated,
In this state, the female terminal block 17 is inserted into one end of the explosion-proof container 2, and the union cover 19 is screwed into a screw portion provided outside the one end of the explosion-proof container 2, whereby the male contact pin 15 and the female contact pin 15 are inserted. The contact pins 16 are connected to complete the wiring.

Further, by loosening the union cover 17 at the time of removal for normal maintenance, the connection between the male contact pin 15 and the female contact pin 16 is separated,
The connector portion 51 is separated from the explosion-proof container 2.

On the other hand, at the time of mounting, the female side terminal block 1
The male contact pin 15 and the female contact pin 16 are coupled by inserting 7 into the inside of one end of the explosion-proof container 2 and screwing the union cover 19 into the screw portion provided outside the one end of the explosion-proof container 2. Then, the connector portion 51 is attached to the explosion-proof container 2.

As a result, the connector portion 51 is integrated, the union cover 19 is screwed into the explosion-proof container 2, and the male contact pin 15 and the female contact pin 16 are connected to each other, thereby facilitating wiring work and maintenance. Wiring can be easily attached and detached.

Although the O-ring and the like are omitted in FIG. 1 for the sake of simplicity, measures necessary for maintaining the explosion-proof state are taken.

For simplicity, the male contact pin 15
Etc. are provided in the central portion of the male side terminal block 14, but needless to say, they are not limited to this and may be arranged as needed.

In the embodiment shown in FIG. 1, the male contact pin 15 is provided on the explosion-proof container 2 side and the female contact pin 16 is provided on the connector portion 51. However, the present invention is not limited to this. Female contact pins may be provided on the container 2 side, and male contact pins may be provided on the connector portion 51. Further, the contact pin may have any shape.

[0035]

As is apparent from the above description,
The present invention has the following effects. By integrating the connector part and screwing the union cover into the explosion-proof container to connect the male contact pin and the female contact pin, wiring is easy and the explosion-proof industrial surveillance camera is easy to attach and detach during maintenance. realizable.

[Brief description of drawings]

FIG. 1 is a configuration plan view showing an embodiment of an explosion-proof industrial surveillance camera according to the present invention.

FIG. 2 is a plan view showing an example of a conventional explosion-proof industrial surveillance camera.

[Explanation of symbols]

 1 camera 2 explosion-proof container 3 belt 4,5 axis 6 focus adjusting screw 7,8 connector 9 rear cover 10 stopper 11, 11a, 12, 12a wiring cable 13, 13a composite cable 14 male terminal block 15 male contact pin 16 Female contact pin 17 Female terminal block 18 Wiring terminal block 19 Union cover 20 Connector case 21 Clamp cover 22 Pressure-proof packing 23 Cable clamp 50 Focus adjustment means 51 Connector part

Front Page Continuation (71) Applicant 000006507 Yokogawa Electric Co., Ltd. 2-9-32 Nakamachi, Musashino-shi, Tokyo (74) Attorney Masayuki Watanabe (72) Inventor Norio Matsudaira Osaka City, Osaka Prefecture 3-3-22 Nakanoshima, Kita-ku, Kansai Electric Power Co., Inc. (72) Inventor: Shoichi Matsuoka, Osaka City, Osaka City 3-32-22 Nakanoshima, Kita-ku, Kansai Electric Power Co., Inc. (72) Masanobu Nagao Osaka, Osaka 3-6-26 Tenjinbashi, Kita-ku, Ogimachi Park Building, Anan Electric Co., Ltd. (72) Inventor Akira Oya 2-932, Nakamachi, Musashino-shi, Tokyo Yokogawa Electric Co., Ltd. (72) Inventor, Riki Furuya Tokyo Yokogawa Electric Co., Ltd. 2-932 Nakamachi, Musashino City (72) Inventor Kunihiko Ueda 2-932 Nakamachi, Nakamachi, Musashino City, Tokyo Yokogawa Electric Co., Ltd.

Claims (1)

[Claims] 1. An explosion-proof industrial surveillance camera used in a dangerous atmosphere, comprising an explosion-proof container, a camera having a focus adjusting function provided inside the explosion-proof container, and a focus adjusting device provided outside the explosion-proof container. Focus adjusting means including a shaft fixed to a screw for transmitting the rotational movement of the focus adjusting screw inside the explosion-proof container, and a belt for transmitting the rotational movement of the shaft to the focus adjusting function of the camera; The first contact pin is provided inside the container and is connected to the input / output of the camera, and the second contact pin is connected to each wiring cable of the composite cable. An explosion-proof industrial surveillance camera, comprising: a connector portion for connecting the first and second contact pins to each other.