JPS58158811A - Insulating rod - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The operating rod or lever 9 of the operating mechanism of the air device
This invention relates to an insulating rod used as a support rod for components such as pulp.

(Technical Background of the Invention) In general, in a switchgear such as a vacuum breaker or an air interrupter, the insulated operating rod has a sufficient connection between the electrically photovolted part and the ground potential part. It is necessary to ensure surface dielectric strength and ensure mechanical movement.

Moreover, its mechanical movement, that is, the tensile force and compressive force acting on the insulated operating rod during opening and closing operations, and the
It must be able to withstand mechanical loads such as impact bending stress due to excessive wave vibrations. In recent years, in response to the above-mentioned demands, as shown in Part 1 W(a) and (b), glass cloth is wrapped concentrically to reinforce round rods impregnated and hardened with 11 fats such as polyester and epoxy. Generally, a rim rod is used, in which epoxy resin (R2) on which aluminum particles or silica particles are photoconducted is cast around the shaft 1 in the shape shown in the figure.

[One point between background technology]

However, the reinforced insulating rod of this woodcutter needs to be mechanically connected to other movable parts at its upper end for the required function. Therefore, a female thread 3 for a joint is machined on the shaft core end of a glass cloth laminated round rod l serving as a reinforcing shaft, and the structure is such that it is fastened to a bolt member made of another metal material. Therefore, when repeatedly subjected to shocking tensile and compressive forces that act during opening/closing operations, fiS shear stress will repeatedly act on the female screw thread of the glass cloth horizontal rod (IC), causing fatigue damage to the female thread. There was a drawback that the bolt member could be pulled out.

[Purpose of the invention]

The object of the present invention is to eliminate the above-mentioned drawbacks, improve the strength of the female threaded part of the joint, and furthermore, under the condition of the same cross-sectional area, it can withstand impactive tensile, compressive and bending loads. An object of the present invention is to provide an insulating rod with improved allowable stress.

[Invention O implementation sequence]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 8
In Figures 2 (a), (b) and (C), the reinforcing shaft 4 is made by stacking glass cloth, applying a stone impregnated with synthetic resin such as epoxy resin, hardening it under pressure, and cutting out a square bar from a nine-layered board. One of various wedge-shaped y4s as shown in #(tl) in FIG. 3(a) is machined on at least one end in the laminating direction of the glass cloth. Joint metal A
6 does not have a straight II carving on the reinforcing shaft 4, but a female thread 3 is provided at one end of the shaft core of another metal round bar, and the other end of the metal round bar is provided with a female thread 3 (Fig. 3)
, It is a round one that forms either the various wedge-shaped #5 shown in (b) or the inverse wedge-shaped $5'. Reinforcement shaft 4
, the joint fittings 6 are fitted with these circumferences 6 and 5'.

Then, synthetic resin such as epoxy resin filled with shishika particles or aluminum lotus particles is cast around the joint M1 around the combined reinforcing shaft 4 and joint metal A4t as shown in Fig. 2. form an insulating bar. The connection between the l1i5 and other movable parts is achieved by screwing together the female thread I provided on the joint fitting 6 and the bolt member 9.

With the insulating rod having the above configuration, a large impact, compressive and shear stress is generated on the reinforcing shaft 4 due to the impactful tensile force or compressive force that is applied during opening and closing operations.
The impact tension and pressure W1 force is +1+-4 parallel to the 11 lateral surfaces of the glass cloth, and the shear stress is also perpendicular to the 1 lateral surface of the glass cloth, so these 471 m loads As shown in FIG. 4, the fracture strength of the calcaneal bone against stress is greatly improved as shown in B compared to A in the case where the conventional laminated round bar 1 is replaced with a reinforced shaft-bound insulated bar.

When the internal thread 3 is formed directly on the round bar 1 like a conventional insulating bar, impact shear stress acts on the interface of the glass cloth 1, as shown by arrow C in Fig. 5←), (1)). Therefore, the reinforcing effect of the glass cloth fibers is almost absent, and the strength is that of the epoxy resin alone, resulting in an extremely low strength. On the other hand, in the case of the insulating rod of the present invention, FIG. 6(a),
(b) e (C) # (As shown by the arrow in (1), the surface where the shear stress acts and the laminated surface of the glass cloth are in direct contact with each other, so the reinforcing effect of the glass cloth fibers is sufficient. The 1-horizontal round rod has glass cloth tightly wrapped around it to impregnate and harden the resin, while the 1-horizontal plate is made by stacking glass cloth and impregnating it with resin. Because it is cured under pressure, the volume content of glass cloth fibers in laminated J-plates is higher than that in horizontal and round bars.Therefore, the fatigue strength against repeated tension in the axial direction is also lower than that of laminated square bars. Therefore, insulating rods with the same cross-sectional conditions have higher mechanical strength against loads during opening/closing operations or against shock damage caused by transient vibrations. becomes more reliable.

Although the present invention has been described above in the case of a pleated cast insulated keywood whose reinforcing shaft is a multilayer board, the present invention is not limited thereto. In the case of an insulated operation rod or an insulated support rod that does not require a long insulation distance, an insulated round rod with a horizontal Ill plate as a reinforcing axis by epoxy casting or thermoplastic resin molding can also have the same effect. is superior.

〔Effect of the invention〕

As described above, according to the present invention, an insulating rod as an insulated operating rod or an insulated support rod in a switching device such as a vacuum breaker or a tension interrupter is not affected by the tr-like wheel load or transient image movement during opening/closing operations. It has excellent fatigue strength characteristics against impact damage, and also shows high strength against loads and other external forces when tightened during assembly.

[Brief explanation of drawings]

Figure 1 is a diagram showing a conventional cast-molded insulating rod;
(b) is a vertical cross-section positive ifl factor, FIG. 2 is a diagram showing an insulating rod having the laminate of the present invention as a reinforcing shaft, (a) is a plan view, (b) is a vertical cross-sectional front view, and (C) is a vertical cross-sectional side. Intrinsic cause, Figure 3 (a),
(b) is a perspective view showing the shape of both ends of the reinforcing shaft in the insulating rod of the present invention, Fig. 4 is a characteristic diagram showing a comparison of calcaneus strength between the insulating rod of the present invention and the conventional SM keyaki, Fig. 8g5←) l (b
) is an explanatory diagram showing the action of shear stress at the joint of the reinforcing shaft in a conventional insulating rod.
C) # (d) is an explanatory diagram showing the action of shear stress at the joint portion of the reinforcing shaft in the insulating rod of the present invention. 1... Laminated round bar, 2... Molded resin, 3 - Metal fitting connection...
Female thread, 4...horizontal 1-square bar, 5. ♂・-groove, 6...
Joint fittings, 9... Bolt members. Applicant's agent Patent attorney Takeshi Suzue 2nd 11th! ! Figure 2 (a) (b) Figure 3 (a) (b) Figure 4 1p, Town Yoji Rebellion, middle Figure 5 (a) (b) Figure 6 (a) (b)

Claims (1)

[Claims] A laminated square bar is formed from one glass cloth laminated plate, and has a wedge-shaped groove formed in at least one end in the direction of the laminated layer, and a wedge-shaped groove that fits with this laminated square rod 0#lI is formed. Accumulation 1
Fitting metal attached to square bar, laminated square bar and fitting metal^
An insulating rod made of synthetic resin cast around the periphery.