JPS6126290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection device for a bus duct, particularly a bus duct that is fastened all at once, such as an insulated conductor contact type or an interphase reduction type.

The bus duct connection device of the above type overlaps the ends of the same-phase conductors of the bus duct units to be connected, inserts an insulating separator between the different-phase conductors and between the outermost conductor and the duct side plate joint plate, and then Pass the insulated bolt through the insulating separator and conductor and tighten it all together with a nut. Then, cover the upper and lower open surfaces of the connection part with lids, and secure them with screws or the like.

Also, match the conductors of the same phase and attach a backing plate, pass the bolt through the joint plates on both sides at the top and bottom positions avoiding the conductors, the backing plate, and the insulating separator, tighten them all together with nuts, and put a cover on the upper and lower open surfaces. There are also configurations that do this.

However, with the above-mentioned conventional bus duct connection device, sometimes people forget to crimp the fasteners made of bolts, nuts, etc., and the connection lid is closed while it is temporarily tightened. may generate heat and cause an accident.

Therefore, after the construction of the bus duct is completed, it is mandatory for the person in charge of management to check the degree of tightening of the connecting device. Due to these reasons, tightening confirmation work has become difficult and complicated.

The present invention solves the above problems and at the same time
The fastener can be tightened to a predetermined torque without using a torque wrench.

That is, in the bus duct connection device having the above configuration, the fastener is provided with a portion that is sheared off with a predetermined tightening torque, and a lid fitting prevention member that can be removed when the sheared portion is removed is removed. It is characterized in that it is constructed so that the lid can be fitted and attached.

A first embodiment of the apparatus of the present invention will be described below with reference to FIGS. 1 and 2. D1 and D2 are bus duct units to be connected, 1, 2, and 3 are conductors with insulation coating, and 4
is a duct side plate joint plate, 5 is an insulating separator, 6 is a bolt with insulation coating, 7 is a nut, 8 is a lid, 9 is a screw, and the head of the bolt 6 is sheared with the specified torque required for complete tightening. A narrow neck 61 is provided, and the head is divided into a small diameter inner part 62 and a large diameter outer part 63.

A disc spring 10, a flat washer 11, and a lid fitting prevention member 12 are fitted onto the bolt 6 on the outside of one of the duct side joint plates 4.

The lid fitting prevention member 12 is connected to the duct side plate connecting plate 4.
It has a slightly higher U-shape, and its upper and lower bent sides 121 and 122 have a length that overlaps the upper and lower edges of the duct side plate connecting plate 4 even when the bolts 6 and nuts 7 are temporarily tightened.

In addition, the lid fitting prevention member 12 is fitted onto the inner head 62 of the bolt 6 through a circular hole 123 in the center of the vertical side, and is prevented from coming off by the outer head 63.
In this case, in order to prevent the lid fitting prevention member 12 from moving over the inner head 62 and falling into the narrow neck 61, a Sometimes I wear color 13.

In the temporarily tightened state shown in FIG. 2, even if you try to fit the lid, the edge of the lid will be stuck to the lid fitting prevention member 1, as shown by the neck line 8.
It gets stuck on the bent sides 121 and 122 of No. 2 and does not fit.

Therefore, place a turning tool such as a spanner on the outer head 63 of the bolt, hold the nut 7 so that it does not turn, and then tighten. In addition to using a tool as a means for pressing the nut 7 so that it does not rotate, as shown in FIGS. It is also possible to provide a notch 124 in the nut 7 and engage the nut 7 to prevent rotation. When a predetermined tightening torque is reached, the narrow neck 61 is sheared and the outer head 63 falls off as shown in FIG.

Therefore, the lid fitting prevention member 12 can be removed from the bolt 6 as shown by the chain line 12', and the lid 8 can be fitted as shown in FIG.

When retightening the bolts 6 or loosening the bolts during disassembly, a tool is hung on the remaining inner head 62.

It is also possible to make the center hole 123 of the lid fitting prevention member 12 into a daruma hole so that the member 12 can be locked to the narrow neck portion 61. In this case, if the narrow neck 61 is cut,
The lid fitting prevention member 12 falls together with the outer head 63, saving the effort of removing it.

Further, the shape of the lid fitting prevention member 12 is not limited to the U-shape of the embodiment.
The bent sides 12 and 122 of 2 are connected to the bus duct unit.
The outer head 63 is formed to a length that covers the lid mounting screw holes provided in D ₁ and D ₂ to prevent the lid 8 from being forcibly installed with the screws 9. The shape can be any shape as long as it prevents the lid 8 from fitting before the shear is removed and can be removed after the shear is removed.

When connecting a large-capacity bus duct using multiple bolts, form the head of each bolt as shown above, equip each bolt with a common cover fitting prevention member, and completely tighten all bolts. After the completion of the process, the lid fitting prevention member can be removed.

FIG. 5 shows a second embodiment of the device of the present invention, in which a nut 7 is provided with a narrow neck portion 71 that is sheared with a predetermined tightening torque, and an outer portion 73 divided into two by the narrow neck portion 71 is attached to the inner side. It is formed to have a larger diameter than the portion 72. The outer portion 73 and narrow neck portion 71 are not internally threaded.

The lid fitting prevention member 12 is a thin neck portion 71 of the nut 7.
It is fitted and supported around the collar 14 via the collar 14, and is positioned between the large diameter outer portion 73 and the collar 141 of the collar 14.

When the nut 7 is tightened to reach a predetermined tightening torque, the outer portion 73 of the nut is sheared off, similar to the head of the bolt in the first embodiment, so that the lid fitting prevention member 12 and the collar 14 are removed. Can be removed.

The head of the bolt of the first embodiment and the nut of the second embodiment both have outer portions 63 and 73 with a large diameter, but either the inside and the outside have the same diameter (as shown in the sixth figure) or the outer portion has a smaller diameter (the seventh figure). (as shown in the figure). It is also possible to form the outer parts 63, 73 separately and engage the inner parts 62, 72 in a non-rotating manner so that the remaining parts can be removed after shearing. In the case of the examples shown in FIGS. 6 and 7, a retaining plate 15 is required for the lid fitting prevention member.

In the first embodiment, the insulated bolt 6, disc spring 10, flat washer 11, and lid fitting prevention member 12 are as follows:
Further, in the second embodiment, the nut 7, the lid fitting prevention member 12, the collar 14, the flat washer 11, and the disc spring 10 may be preset, or may be preset on the duct side plate connecting plate 4.

As described above, the bus duct connection device of the present invention completely tightens the fasteners 6 and 7 for connecting the conductor and the duct housing to a predetermined tightening torque, and uses that torque to shear a portion of the fasteners 6 or 7. Unless the lid fitting prevention member 12 is removed by detachment,
Since the connecting portion cannot be covered with a lid, if the lid 8 is properly attached or not, it is possible to immediately discover if the fastener has been forgotten to be tightened.

In this case, the lid may have been neglected even though the fasteners have been completely tightened and the lid fitting prevention member has been removed. However, by also checking the presence or absence of the lid fitting prevention member, it is possible to confirm that the lid has been tightened. You can tell if you forgot, or if you tightened it but forgot to put the lid on.

In addition, the bus duct installation worker may close the lid 8 without removing the lid fitting prevention member 12 for some reason, and fix the lid 8 by passing a wire or the like through the screw hole, but it may not be possible to fix the lid 8 as a part. Inspection is easy because the tightening state of the fasteners 6 and 7 can be confirmed by looking at the large lid fitting prevention member 12.

Furthermore, if the surfaces of the lid fitting prevention member 12 and the shearing detachment parts 63, 73 of the fasteners 6, 7 are colored in a conspicuous color, such as red, which is different from the surrounding area, it is possible to Since the tightened state of the bus duct connections can be visually confirmed from a distance, it becomes easier to confirm the safety of bus duct installation work.

When a part of the fastener is sheared off to remove the lid fitting prevention member, the fastener has reached the specified tightening torque, so you can use a general tightening tool without using a torque wrench. It can be easily and accurately tightened, and there is no need to forget to tighten the connections when installing a bus duct.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the connecting device of the present invention, FIG. 2 is a longitudinal sectional front view of the main parts of the device of the present invention in a temporarily tightened state,
Figure 3 is a longitudinal sectional front view of the fully tightened state, Figure 4
5 is a vertical sectional front view of another embodiment of the device of the present invention in a temporarily tightened state; FIG. 6 is a side view showing a modification of the bolt head;
Fig. 7 is a side view showing a modified example of the nut, Fig. 8 is a partially longitudinal front view showing the attachment state of the cover fitting prevention member which also serves to prevent the nut from rotating, and Fig. 9 is a side view showing the attachment state of the cover fitting prevention member. FIG. 6 is a front view showing the engaged state of the nut. D1 and D2 are bus duct units, 1, 2, 3
4 is a conductor, 4 is a duct side plate joint plate, 5 is an insulating separator, 6 is a bolt, 7 is a nut, 8 is a lid, 12 is a lid fitting prevention member, and 63 and 73 are parts to be sheared off.

Claims (1)

[Claims] 1 Overlap the ends of conductors of the same phase or butt them together with a backing plate, and insert an insulating separator between the conductors of different phases and between the outermost conductor and the duct side plate joint plate,
Construct the connection by fastening them with a fastener,
In a connection device that covers the open surface of the connection part, the fastener is provided with a part that is sheared off with a predetermined tightening torque, and is provided with a lid fitting prevention member that can be removed when the sheared part is detached, A bus duct connection device characterized in that it is configured so that the lid can be fitted and installed by removing the lid.