JPH0547496Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cable connection device, and more specifically, to a cable connection device for connecting a cable to equipment having an explosion-proof structure or a waterproof structure.

(Conventional technology) When connecting a cable to equipment with an explosion-proof or waterproof structure, a cylindrical gasket attached to the adapter is crimped onto the cable to isolate the inside and outside of the equipment and maintain the explosion-proof or waterproof effect. That's what I do.

Conventionally, cable connection devices with various structures have been developed. A typical example of the prior art is a device having the structure shown in FIG. In the figure, the adapter 1 has a cylindrical body 2 with a hexagonal cross-section, a mounting screw 3 is provided at the tip for connecting the adapter 1 to a device, and a packing chamber 4 is formed inside. Furthermore, a screw port 5 is provided on the inner circumferential surface of the packing chamber 4 from the terminal position to the base end. 6 is a cylindrical packing, 7 is a washer, and 8 is a gland that is screwed to the screw port 5 of the adapter 1. A tightening part 9 with a hexagonal cross section is provided at the base end, and a cable (not shown) is attached to the inner peripheral surface. A connection screw port 10 for connecting a protection tube is provided. Reference numeral 11 designates a set screw for ensuring the connection between the adapter 1 and the ground 8, and 12 represents a cable.

In order to connect the cable 12 to a device using the conventional technology described above, first, attach the adapter 1 to the mounting screw 3.
Attach the cable 12 to the adapter 1 by fitting the gasket 6 to the cable 12 and inserting the cable 12 into the gland 8.
and attach the seal 6 to the seal chamber 4, and then attach the gland 8 to the screw port 5 of the adapter.
The gland 8 compresses the packing 6 through the washer 7, and seals between the packing 6 and the cable 12 and between the packing 6 and the adapter 1, thereby producing an explosion-proof or waterproof effect. It is.

In the prior art, the packing 6 is compressed by screwing the gland 8 to the adapter 1. Therefore, the cylindrical body 2 of the adapter 1 is fixed with a tool, and the tightening part 9 of the gland 8 is tightened. Requires tightening with another tool. For this reason, since the compressed state of the packing 6 is determined by the degree of tightening of the gland 8, there is a problem that the compression state of the packing varies and the packing effect cannot be fully exhibited.

(Problem to be solved by the invention) The problem to be solved by the invention is to assemble a packing installed between a cable and an adapter so that it can be compressed with a constant pressure. It is an object of the present invention to provide a cable connection device with no variation.

(Means for solving the problem) The means for solving the problem in this invention are as follows:
An adapter that is a cylindrical body with a packing chamber formed inside and a plurality of screw holes on the end face of the proximal end; A gland with a pressure-welding tube inserted into the packing chamber and a connecting screw port for connecting a cable protection tube at the base end, a cylindrical packing accommodated in the packing chamber, and a screw shaft connecting the gland and the adapter. and after fixing the adapter to explosion-proof or waterproof equipment,
The packing is accommodated in the packing chamber, the pressure contact cylinder of the gland is joined to the packing, and the flange is joined to the base end of the adapter, and the flange and the adapter are connected by the screw shaft. It is characterized by being combined.

(Function) Attach the adapter 20 to the device and
5. Cable 33 in order of seat plate 26 and ground 27
and guide the cable 33 into the device.
The packing 25 is pressed into contact with the pressure contact cylinder 29 of the gland 27 via the seat plate 26. When the flange portion 28 of the gland 27 is connected to the cylindrical body 21 of the adapter by the threaded shaft 32, the packing 25 is compressed with the necessary pressure and exerts a packing action on the cable 33 and the adapter 20.

(Example) Figs. 1 to 4 show examples, Figs. 1 and 2 are assembly drawings, and Figs. 3 and 4 are parts drawings.

In these figures, the adapter 20 is a cylindrical body, and the cylindrical main body 21 has a hexagonal outer shape in cross section, and a mounting screw 22 is provided at the tip. A packing chamber 23 is provided inside the cylindrical main body 21.
is formed, and six screw holes 24 are provided on the end surface of the proximal end. The packing 25 is formed into a cylindrical body and is accommodated in the packing chamber 23, and a seat plate 26 is superimposed on the opening side of the adapter.

The gland 27 is a cylindrical body, and a flange portion 28 formed in the same cross-sectional shape as the cylindrical body 21 of the adapter 20 is provided in the center, and a pressure-welding portion 28 is provided at the tip portion to be inserted into the packing chamber 23. Tube 2
9, and a connection screw port 30 for connecting a cable protection tube (not shown) is provided at the base end.
Further, the flange portion 28 is provided with a pair of mounting holes 31 that correspond to the screw holes 24 provided on the end surface of the base end portion of the adapter 20. A screw shaft 32 is inserted through the mounting hole 31 of the flange portion 28 and screwed into the screw hole 24 to connect the gland 27 and the adapter 20.

33 is a cable, 34 is a device to which the cable 33 is connected, and 35 is an O-ring provided on a mounting surface for attaching the adapter 20 to the device.

The embodiment has the above structure, and first, the adapter 20 is attached to the device 34 with the attachment screw 22. Next, the cable 33 is passed through the packing 25, the seat plate 26, and the gland 27, and then guided through the adapter 20 to the device 34. and,
The packing 25 is housed in the packing chamber 23, and the seat plate 2
6. Overlap the pressure contact tube 29 of the gland in this order, insert the screw shaft 32 into the mounting hole 31 of the flange portion 28, and temporarily fix it into the screw hole 24 of the adapter 20.

On the other hand, the packing 25 and the seat plate 26 are stored in the packing chamber 23 in advance, and the gland 27 is temporarily fixed to the adapter 20 with the screw shaft 32. Then, the cable 33 is inserted from the connection screw port 30 of the gland 27, and the It is also possible to insert the cable 33 into the packing 25 and guide it into the equipment 34.

The cylindrical body 21 and the gland 27 of the adapter 20
Since the flange portions 28 of both have hexagonal cross-sections, the pressure contact cylinder 29 of the gland is connected to the packing chamber 2.
3, if the outer shapes of the cylindrical body 21 and the flange portion 28 are matched, the mounting hole 31 will match any of the six screw holes 24, so the screw shaft 32 can be temporarily secured. becomes easier.

After the cable 33 is guided to the device 34,
The temporarily tightened screw shaft 32 is fully tightened to fix the gland 27 to the adapter 20. Patsukin 2
5 is compressed and connects the cable 33 and the packing chamber 2
3 to provide an explosion-proof or waterproof effect. When the gland 27 tightens the screw shaft 32 and the flange portion 28 is joined to the base end of the adapter 20, a predetermined pressing force that compresses the packing 25 is obtained, so the screw shaft 32 is tightened until both are joined. That's fine.

In addition, if the equipment is explosion-proof, ground 27
A cable protection tube is connected to the connection screw port 30 of.

(Effects of the invention) The present invention has a pressure cylinder inserted into the packing chamber at the tip of the gland, and the flange of the gland is joined to the base end of the adapter to compress the packing. Since a pressing force can be obtained, there is no variation in the packing effect due to insufficient compressive force of the packing, and a stable explosion-proofing or waterproofing effect can be obtained.

In addition, in this invention, the gland and adapter have the same outer shape at the joint, so the mounting hole on the gland side and the screw hole on the adapter side can be easily matched, making assembly work easier. This is the result.

[Brief explanation of the drawing]

Figure 1 is a partially longitudinal front view of the assembled whole.
Fig. 2 is a side view of the same, Fig. 3 is an adapter, A is a partially longitudinal front view, B is a side view, Fig. 4 is a ground, A is a partially longitudinal front view, B
5 is a side view, and FIG. 5 is a front view, partially in longitudinal section, of a cable connection device according to the prior art. 20...Adapter, 21...Cylindrical body, 22
...Mounting screw, 23...Packing chamber, 24...Screw hole, 25...Packing, 26...Seat plate, 27...
...Gland, 28...Flange part, 29...Pressure tube, 30...Connection screw port, 31...Mounting hole, 32
... screw shaft, 33 ... cable, 34 ... equipment,
35...O-ring.

Claims (1)

[Claims for Utility Model Registration] (1) An adapter that is a cylindrical body and has a packing chamber formed inside and has a plurality of screw holes on the end face of the base end, and a cylindrical body that has an outer periphery of the central part. a gland having a flange portion formed on its surface, a pressure contact tube inserted into the packing chamber at the distal end, and a connecting screw port for connecting the cable protection tube at the base end;
It is equipped with a cylindrical packing housed in the packing chamber, and a screw shaft for connecting the gland and the adapter, and after fixing the adapter to an explosion-proof or waterproof device, the packing house is housed in the packing chamber, and the gland A cable connecting device characterized in that a pressure contact cylinder is joined to the packing, the flange portion is joined to a base end portion of the adapter, and the flange portion and the adapter are connected by the screw shaft. (2) The cable connection device according to claim 1, wherein the main body portion of the adapter and the flange portion of the gland both have a hexagonal cross section.