JPS592936A - Rigid trolley - Google Patents

Abstract

PURPOSE:To control corrosion of an ear, by plating a contacting part between a trolley line and the ear. CONSTITUTION:Only a frame or ear 3 touching a trolley line 2 in a connecting state with each other is partially plated 10 with nickel or silver whose ionization tendency is larger than that of the trolley line 2 and is smaller than that of the frame or the ear 3. Then, corrosion resulting from an intrusion of an electrolyte into a contacting part can be controlled effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rigid trolley that can prevent corrosion at the contact portion between the wire and the trolley wire.

In a rigid trolley, the pedestal and the trolley wire are connected by a pair of wires applied from both sides and tightened. Generally, the aluminum tow trolley wire of the pedestal and ea is made of copper, and the steel and aluminum are in direct contact at the contact points between the trolley wire of a conventional rigid trolley, the ea, and the pedestal. As a result, when moisture enters between the contact portions, aluminum corrodes due to the difference in ionization tendency between the two metals. Particularly in coastal areas, there are many chlorine ions, and alkaline water may seep from the concrete in underground tunnels. If the resulting electrolyte enters the void where the trolley wire contacts the frame or the Ea, Due to the difference in ionization tendency between the two, a situation has arisen in which the pedestal or Ea is severely corroded.

An object of the present invention is to provide an N rigid body trolley that can suppress corrosion caused by electrolyte intrusion into contact parts.

To achieve this objective, according to the rigid trolley of the present invention, only the part of the frame or wire that contacts the trolley wire in its bonded state is partially plated with a metal whose ionization tendency is greater than that of the trolley wire and smaller than that of the frame or wire. do.

The present invention will be explained with reference to the drawings.

In FIG. 1, the pedestal 1 has a T-shaped cross section and is in contact with the trolley wire 2 at its lower end.

A pair of e-73 are applied from both sides of the pedestal 1 and the trolley wire 20, and are tightened together by the bolts 4 and nuts 5 to connect the pedestal 1 and the trolley wire 2. The ear 3 has claws 6 and 7 at both ends in the vertical direction, the inner surface of the claw 6 engages with the bulge 8 of the pedestal 1, and the claw 7 engages with the second
As shown in the figure, it fits into the recess 9 of the trolley wire 2. The frame work and wire 3 are made of aluminum, and the trolley wire 2 is made of copper. Frame l with trolley wire 2
A metal plating layer 10 is provided on the contact portion of the EA 3. This plating layer 10 is provided only on the contact area and not on other areas. As metals, metals with an ionization tendency greater than copper and less than aluminum are selected, such as nickel, tin, zinc, lead, in particular nickel and tin being preferred. The plating layer 10 preferably has a thickness of 10μ or more. The method for forming the plating layer 10 will be explained for Ea 3. Contact portion A1 of A7A3 with the trolley wire 2 and exposed portion B of Ea3 from the trolley wire 2. can be determined almost exactly before the rigid trolleys are connected. In the present invention, as a first step, the exposed portion B is masked. As a mode of masking, exposed portion B
There is application of resin paint such as epoxy to the exposed portion B, and application of tape such as resin to the exposed portion B. The boundary between the contact portion A and the exposed portion B is particularly precisely masked. Masking can be omitted for the exposed portion B that is sufficiently distant from the contact portion A. In the second step, the claw 7 of E73 is immersed from the tip into the electrolytic solution and plated with the metal described above. Claw 7
When immersing the nail 7 in the electrolyte, submerge the pawl 7 in the electrolyte until the contact portion A is completely immersed in the electrolyte, that is, above the boundary between the contact portion A and the exposed portion B.

After metal plating, as a third step, the masking of the exposed portion B of A7A3 is removed. When masking involves applying a resin paint, a solvent is applied to the resin paint to dissolve and remove the resin paint. If masking is done by attaching tape, remove the tape. In this way, only the contact area A is metal plated with precisely defined boundaries. Further, the plating layer 10 of the pedestal 1 is also formed by masking the exposed portions in the same manner as in the case of the EA 3 described above.

Note that the contact surface of the pedestal 1 with the trolley wire 2 is
It may also be an arcuate concave surface that matches the top curvature of. In this way, moisture is less likely to enter the contact area between the two. Furthermore, the plating layer 10 may be provided only on either the pedestal 1 or the ear 3.

According to the rigid trolley of the present invention, even if the acidic and alkaline electrolytes enter the gap in the contact area between the trolley wire 2 and the pedestal or EA 3, the electrolyte will not be absorbed between the pedestal 1 or EA 3 and the trolley wire. Only in contact with the plating layer IO, which has an ionization tendency intermediate between that of 2 and ↑, the mount L or E3
Since there is no direct contact with the mount 1 or E 73, corrosion of the mount 1 or E 73 is suppressed. In addition, pinholes are likely to exist in the metal plating film, and if the plating layer 10 is also present in the exposed portion B, the electrolyte may reach the surface of the E-A 3 through the pinhole and connect the plating layer 10 and the pedestal L or E-A. Corrosion occurs in the pedestal 1 or the E 73 due to the difference in ionization tendency between the E and E. However, in the present invention, since the plating layer 10 is present or absent in the exposed portion B, such inconvenience can be avoided. As mentioned above, the plating layer IO is preferably tin or nickel. Corrosion caused by contact between tin and aluminum is significantly smaller than corrosion caused by contact between copper and aluminum, and nickel not only has great corrosion resistance in itself, but corrosion caused by contact between nickel and aluminum is significantly lower than that caused by contact between copper and aluminum.・If you are simply forming a metal film on the contact area A ・In addition to plating methods ・There are tape forming welding methods, cladding methods, extrusion bonding methods, etc., but these methods Formation of a metal film is significantly more troublesome than in the plating method.

As described above, according to the present invention, the contact portion of the frame or the Ea with the trolley wire has a strictly defined boundary and is plated with a metal having an ionization tendency smaller than the Ea and greater than the trolley wire, so that the Ea from the trolley wire is plated with a metal having a smaller ionization tendency than the trolley wire. There is no plating on the exposed parts of the plate. Therefore, it is possible to suppress the corrosion of the 6-frame or E-A due to the difference in ionization tendency between the 6-frame or E-A and the trolley wire, and avoid the corrosion of the 6-frame or E-A due to the presence of the plating layer in the exposed portion.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the rigid trolley of the present invention, and FIG. 2 is an enlarged view of the contact portion between the wire and the trolley wire in FIG. 1. 1... Frame, 2... Trolley wire, 3... Ea,
4... Zelt, 7... Tsume, 9... Concavity, 10.
...Plating layer. Figure 1 Figure 2

Claims (1)

[Claims] In a rigid trolley in which a pedestal and a trolley wire are connected by an ea, the pedestal or ea is partially plated with a metal whose ionization tendency is greater than that of the trolley wire and smaller than that of the pedestal or ea, only in the portion in contact with the trolley wire in the coupled state. A rigid trolley featuring