JPH0547495Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a device for connecting cables to explosion-proof equipment.

(Prior art) A cable connection device that allows a cable to be attached to or removed from the device while the cylindrical packing housed in the packing case is crimped to the cable when connecting the cable to explosion-proof equipment. is known from Publication No. 57-8230.

In explosion-proof equipment, the cables to be connected are required to be placed inside a protective tube and attached to the equipment together with the protective tube. Therefore, when replacing the protection tube, it is necessary to remove the cable from the explosion-proof equipment. Prior to the development of the above-mentioned precedent, when removing a cable from explosion-proof equipment, the crimping of the packing was released, and then the cable was removed from the explosion-proof equipment, and when the cable was to be reattached to the equipment, the packing was re-crimped. However, the above-mentioned work of crimping and opening the gaskets was time-consuming and frequent.

As shown in FIG. 17, the conventional example includes a cylindrical body 2 fixed to an explosion-proof device 1, a tube 3 that is detachable from the cylindrical body 2, a packing 4 housed in the tube 3, and a cylindrical body 4. It has a gland 5 that presses against the bottom of the tube 3, a coupling 6 that connects to the gland 5, and a cover 7 that fixes the tube body 3 to the cylindrical body 2. The cable is inserted into the cylindrical body 3 with a packing 4 fitted thereon, and the packing 4 is tightened with a gland 5 to be crimped onto the cable. The cable with the packing attached is introduced into the explosion-proof equipment 1 from the cylindrical body 2, and the cable is inserted into the tube body 3.
If the cable is installed at the bottom of the cylindrical body 2, the cable can be attached to the device with the gasket crimped.

Further, when removing the cable from the explosion-proof device 1, the cable and the tube body 3 can be removed together, so that the gasket can be removed while maintaining the crimped state to the cable.

The above conventional example is superior in workability in that the cable can be attached and removed while the packing is crimped to the cable, compared to the previous conventional technology. Since the gland used for this purpose has a screw-tight structure, the cable is installed in the center of the tube, and one connection device is required for each cable.

However, depending on the structure of the explosion-proof equipment, two or three cables may be required, and providing a connection device for each cable not only takes time and effort to assemble, but also Depending on the size, etc., it may not be possible to install multiple connection devices side by side. For this reason, it is desired that two or three cables be connected to explosion-proof equipment using a connecting device, but the above-mentioned prior art examples have not been able to satisfy these demands.

(Problems to be Solved by the Invention) The present invention solves the problems of the prior art by providing a cable connection device that allows multiple cables to be attached to and removed from explosion-proof equipment with their gaskets crimped. It is something.

(Means for Solving the Problems) The solution of the present invention includes a cylindrical adapter fixed to explosion-proof equipment, a packing case having a plurality of penetrating recesses and forming a part of the recesses into a packing chamber;
A ring-shaped packing housed in the packing chamber, a packing land forming a cylindrical support leg that fits into the packing chamber of the packing case, an attachment port to be connected to the adapter, and a crimping part to press the packing case to the adapter. It is also characterized by comprising a packing cover having an opening on the opposite side of the mounting opening.

(Function) The first screw portion 13 of the adapter 11 is attached to the explosion-proof device 10. The cable 25 is passed through the support leg 23 of the packing gland 22 and the packing 20, the cable 25 is passed through the concave hole 18 of the packing case 16, and the packing 20 is housed in the packing chamber 19. The packing land 22 is fixed to the packing case 16 by pressing the packing 20 with the support leg 23.

Next, the assembled packing case 16 is fitted into the adapter 11, the packing cover 31 is screwed into the second threaded portion 14 of the adapter 11, and the cable is connected to explosion-proof equipment.

(Example) Figures 1 to 11 are the first example. In each figure, 10 is explosion-proof equipment, 11 is a cylindrical adapter attached to the explosion-proof equipment 10,
A flange portion 12 is formed, threads are formed on both outer peripheries of this flange portion 12, the cylindrical portion facing one end is used as the first threaded portion 13 to be screwed into the explosion-proof device 10, and the cylindrical portion facing the other end is a cover. This is the second threaded portion 14 to which the screw is attached. Also, adapter 1
A stepped portion 15 is formed inside the portion 1 (see FIG. 3).

Reference numeral 16 denotes a packing case that is detachably housed in the adapter 11 and has a flange 17 at its base end.The main body portion is inserted into the cylindrical part of the adapter 11 and has the flange 17 at the base end of the adapter cylindrical part.
are joined. This packing case 16 is provided with a plurality of recessed holes 18 extending in the axial direction, and the inner diameter of each recessed hole 18 is such that the part that opens at the proximal end face where the flange 17 is formed opens at the distal end face. This large diameter portion is used as a packing chamber 19 (see Fig. 4).

In the embodiment, the two packing chambers 19 are provided at symmetrical positions with respect to the center of the base end surface of the packing case 16, but the installation positions may be asymmetrical.
Furthermore, the diameters of the two do not need to be the same.

A ring-shaped packing 20 is housed in the packing chamber 19, and is housed with seat plates 21 interposed in the front and rear. Reference numeral 22 denotes a packing gland that overlaps the base end surface of the packing case 16, and has a cylindrical support leg 23 that fits into the packing chamber 19. Reference numeral 24 denotes a clamp base that is joined to the opposite side of the support leg 23 of the packing land 22, and has a groove 26 into which the cable 25 inserted into the support leg 23 of the packing land 22 is fitted, and the cable 25 is inserted into the groove. 26 and then overlapped with a presser plate 27, and by fixing the presser plate 27 to the clamp base 24 with machine screws 28, the cable 25
and a clamp stand 24 (see FIGS. 5 to 9).

In addition, the packing gland 22 is installed for each cable, and the clamp stand 24 is installed on the packing gland 2.
2, and the first one together with packing gland 22.
It is fixed to the packing case 16 with a screw shaft 29.
Also, the clamp stand 24 of the packing land 22
The unoverlapped portion is fixed to the packing case 16 by the second screw shaft 30.

Reference numeral 31 designates a packing cover that is screwed into the second threaded portion 14 of the adapter 11, and has a crimp portion 33 formed of a stepped portion adjacent to the mounting screw opening 32 for press-fitting the packing case 16;
An opening 34 having a diameter through which a protective tube (not shown) of each cable 25 can be inserted is formed on the opposite side (see FIG. 10).

In addition, 35 is an O-ring installed between the packing cover 31 and the second screw part 14 of the adapter 11, and 36 is an O-ring installed between the end face of the flange part 12 of the adapter 11 and the explosion-proof device 10. .

The embodiment has the above structure, and the adapter 11
is attached to the explosion-proof device 10 by the first screw portion 13 after removing the packing cover 31. Fit the packing gland 22, seat plate 21, packing 20, and seat plate 21 into the cable 25 in this order, and insert the cable 25 so that the seat plate 21 reaches the bottom of the packing chamber 19.
into the concave hole 18 of the packing case 16, or insert the seat plate 21, the packing 20, and the seat plate 21 into the packing chamber 19 of the packing case 16, and then the packing gland 22 is brought into contact with the seat plate 21, and then clamped. The first and second screw shafts 2 are assembled by overlapping the bases 24.
9 and 30 temporarily, insert the cable 25 from the packing gland 22 side, and attach the packing case 16.
(See Fig. 11).

Next, the cable 25 is engaged with the groove 26 of the clamp base 24, and the clamp base 24 is inserted into the packing case 16 with the first screw 2 together with the packing gland 22.
9, and the other part of the packing gland 22 is fixed with a second screw shaft 30.

Note that the cable 25 is fixed to the clamp base 24 and the presser plate 27 with machine screws 28.

By tightening the first and second screw shafts 29 and 30, the support leg 23 compresses the packing 20 in the axial direction, so that the inside of the packing 20 is crimped to the cable 25, and the outside is crimped to the packing case 16, resulting in a packing effect. play.

After the cable 25 is assembled to the packing case 16 as shown in FIG.
6 into the adapter 11. adapter 11
By screwing the packing cover 31 into the second threaded portion 14 of , the packing case 16 is fixed to the adapter 11 and the cable 25 is connected to the explosion-proof device 10.

Figures 12 to 16 show the second embodiment. In the second embodiment, the packing case, packing, seat plate, and packing gland are different from the first embodiment, but other components are the same as in the first embodiment. This is the same as the embodiment.

For ease of explanation, the same members in the second embodiment as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, with "100" added.

In the second embodiment, the packing case 11
One packing chamber 119 is formed in the packing chamber 119, and two recessed holes 118, 118 communicating with the packing chamber 119 are formed in the packing chamber 119.
A packing 120 and a seat plate 121 housed in the packing chamber 119 are provided with two through holes through which cables 125, 125 are inserted.

The second embodiment is configured so that two cables can be connected, but it is also configured so that three cables can be connected, or a plurality of cables with different thicknesses can be connected. be able to.

Next, when replacing the protective tube of the cable 25, simply remove the packing cover 31 and replace the cable 25.
5 can be removed while the gasket 20 is crimped to the gasket case 16. Therefore, after replacing the protective tube, the packing case 16 can be reattached to the adapter 11, and during this time, the packing 20 remains crimped to the cable 25, so there is no need to repeatedly press and release the packing.

(Effects of the invention) The present invention is a device that connects a cable to explosion-proof equipment with a gasket crimped to the cable, in which a plurality of recessed holes are provided in the gasket case, and a part of the recessed holes is formed in the gasket chamber. Since a cylindrical support leg is provided on the end face of the packing gland that presses the packing gland housed in the packing chamber, multiple cables can be assembled to the packing case with the packing glands crimped. It is possible to incorporate multiple cables into the adapter with the gaskets crimped, and this has the effect of allowing multiple cables to be connected to explosion-proof equipment using one connection device.

[Brief explanation of drawings]

Figures 1 to 11 show the first embodiment, with Figure 1 being a cross-sectional view of the entire assembly, Figure 2 being a side view of the whole with the packing cover removed, and Figure 3 being a partial cross-section of the adapter. Figure 4 shows the packing case, A is a partial sectional view, B is a side view, Fig. 5 is the packing, A is a partial sectional view, B is a side view, and Fig. 6 is the seat. It is a plate, A is a partial cross-sectional view, B
is a side view, and Figure 7 is a packing land.
A is a partial sectional view, B is a side view, FIG. 8 is a clamp stand, A is a plan view, B is a front view, and FIG. 9 is a presser plate, A is a plan view, and B is a front view. Figure, 1st
Fig. 0 is a partial sectional view of the packing cover, and Fig. 11 is a sectional view of the cable installed in the packing case. 12 to 16 show the second embodiment, and FIG. 12 shows a packing case,
A is a partial sectional view, B is a side view, and FIG. 13 is a packing; A is a partial sectional view, B is a side view, and
Figure 4 shows the seat plate, A is a partial sectional view, B is a side view, Figure 15 is a packing gland, A is a partial sectional view, B is a side view, and Figure 16 is a packing case. FIG. 3 is a cross-sectional view of the cable installed. FIG. 17 is a sectional view of a cable connection device according to the prior art. 10...Explosion-proof equipment, 11...Adapter, 12
...Flange part, 13...First screw part, 14...
...Second screw part, 15...Step part, 16...Packing case, 17...Flange, 18...Recessed hole, 1
9...Patsukin room, 20...Patsukin, 21...
Seat plate, 22... Packing gland, 23... Support leg, 24... Clamping stand, 25... Cable, 2
6... Groove, 27... Pressing plate, 28... Machine screw,
29...First screw shaft, 30...Second screw shaft, 31
...Packskin cover, 32...Mounting screw port, 33
...Crimp part, 34...Opening part, 35, 36...O
ring.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cylindrical adapter to be fixed to explosion-proof equipment, a packing case with a plurality of penetrating recesses and a part of the recessed holes formed in a packing chamber, and a packing case housed in the packing chamber. A ring-shaped packing, a packing land formed with a cylindrical support leg that fits into the packing chamber, a mounting port for connecting to the adapter at one end and an opening at the other end, and the packing case is attached to the adapter in the middle part. A packing cover is provided with a crimp portion that is crimped to the cable, and after the cable is inserted through the packing gland and the packing land, the packing is accommodated in the packing chamber of the packing case, and the packing is pressed against the supporting legs. The packing gland is fixed to the packing case, the packing case assembled in this way is inserted into the adapter previously fixed to explosion-proof equipment, the packing cover is coupled to the adapter, and the packing case is attached to the adapter. A cable connection device for explosion-proof equipment, characterized by being connected and fixed to. (2) Claim 1, characterized in that it has a clamp base in which a groove into which the cable is fitted is formed and the cable engaged in the groove is fixed with a holding plate, and the clamp base is fixed to the packing case. A cable connection device for the explosion-proof equipment according to item 1. (3) The adapter is formed with a flange portion, one of the flange portions is formed with a first threaded portion for attaching to the explosion-proof equipment, and the other is formed with a second threaded portion for attaching the packing cover. 2. The cable connection device for explosion-proof equipment according to claim 1, wherein an O-ring is attached to a mounting surface to the explosion-proof equipment and a joining surface of the second screw portion and the packing cover.