JPH0323764Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a ceiling tube for a pantograph type current collector.

[Conventional technology]

In electric cars, pantographs are generally mounted on the roof of the vehicle in order to take electricity from the overhead contact lines into the vehicle, and their current collector slider slides on the overhead contact lines to collect current. For this purpose, those shown in FIGS. 2 and 3 are commonly used.

Figures 2 and 3 are main part configuration diagrams of conventional electric car pantographs, in which 1 is the overhead contact line, 2 is the vehicle, and 3
is an insulator, and 4 is a pantograph.

In FIGS. 2 and 3, a pantograph 4 is mounted on the roof of a vehicle 2, electrically insulated by an insulator 3. The pantograph 4 is the underframe 4
A is provided with a framework in which a lower frame 4b is connected via a bearing portion 4c, and an upper frame 4d is connected to the lower frame 4b via a hinge portion 4e. Furthermore, the upper frame 4d
A ceiling pipe 4f is provided at the apex of the upper part, and the upper frame 4d is rotatably connected to the left and right by the ceiling pipe 4f. Furthermore, at this ceiling pipe 4f section, the boat support device 4g equipped with a restoring spring SP is used to support the boat body 4.
It holds h. The boat body 4h is provided with a current collecting slide plate SD on the upper surface, and since the current collecting slide plate SD slides on the overhead contact line 1, it performs a current collecting function.

In such a pantograph 4, the materials of the frame, ceiling pipe, and hull as described above are metal; the framework and ceiling pipe are made of iron or aluminum pipes, and the hull is made of iron or aluminum plate material. A good electrical conductor is used.

Note that this structure is the same regardless of the shape of the pantograph, whether it is a diamond-shaped pantograph, a lower frame intersecting pantograph, or a Z-shaped pantograph. In particular, in all three shapes, the relationship between the ceiling pipe 4f and the boat body 4h is formally the same, and generally the sliding surface of the boat body 4h and the ceiling pipe 4f are disposed at a distance of several tens of millimeters.

[The problem that the idea aims to solve]

In such a configuration, an arc jumps between the overhead contact line 1 and the ceiling tube 4f of the pantograph 4, causing the ceiling tube 4f to be damaged by melting. Therefore,
For example, in applications where arcing is severe, such as on Shinkansen trains, it is necessary to periodically replace the ceiling pipe 4f itself. In addition, although conventional trains have less arc damage than Shinkansen trains, they still have the problem of having to be replaced due to damage during inspection.

In view of the above-mentioned points, the present invention focused on the fact that ceiling pipes are conductors, which cause arcing between them and overhead power lines, and also developed a pantograph in which the ceiling pipes are covered with an insulating material. The object of the present invention is to provide a ceiling tube for a pantograph type current collector that has a simple structure that prevents melting and damage by not allowing arc current to flow between the overhead contact line and the ceiling tube.

[Means to solve the problem]

That is, the means for achieving that purpose consist of a metal pipe (PIP) with an insulating coating COV, such as an insulating tube or a coating of insulating material, at the upper apex of the upper frame 4d of the pantograph 4'.
The upper frame 4d is rotatably coupled, and the boat body 4h is supported via a boat support device 4g on the upper part.

In other words, one way to prevent erosion is to use an insulating material for the ceiling pipe itself, but due to the structure of the framework, it is necessary to reduce aerodynamic resistance, so it is preferable to use an insulating material as thin as possible. However, due to its effectiveness as a strong member, metal pipes are inevitably used. Therefore, as mentioned above, the function of preventing corrosion damage is achieved by wrapping an insulating tube around a metal pipe or by coating the outer peripheral surface of the pipe with an insulating material.

[Effect]

Its operation will be explained in conjunction with the following embodiments.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

〔Example〕

Figures 1a and b show an embodiment of a ceiling tube for a pantograph type current collector according to the present invention, Figure 1a is a plan view of the main part thereof, and Figure 1b is taken along line C--C in Figure 1a. It is a sectional view, and the same reference numerals as in FIGS. 2 and 3 indicate the same components. In Figures 1 and 2,
4' is a pantograph, and 4f' is a ceiling pipe of the pantograph 4'.

The ceiling pipe 4f' is composed of a metal pipe PIP and an insulating coating COV covering the metal pipe PIP.

Note that the insulating coating COV is formed by wrapping an insulating tube around a metal pipe or by coating the outer peripheral surface of the pipe with an insulating material.

In the ceiling tube for a pantograph type current collector constructed in this way, generally speaking, both ends of the ceiling tube 4f' have a small degree of melting due to the generation of arc between the contact wire and the ceiling tube. Become.

As shown in the figure, the ceiling pipe 4f' section is coated with an insulating coating COV for about ±250 mm from the center line C--C. It goes without saying that the degree of prevention of melting damage of the apparatus shown in FIG. 1 may be further strengthened, and similar treatment may be applied not only to the ceiling pipe section but also to the upper frame section.

[Effect of idea]

As explained above, according to the present invention, it is possible to provide a device with a simple structure that prevents the occurrence of arc damage to the metal portion of the upper frame, maintains strength at all times, and is safe to use. Furthermore, it goes without saying that the number of man-hours for inspecting the upper part of the upper frame can be significantly reduced.

[Brief explanation of the drawing]

Figures 1a and 1b show an embodiment of the ceiling tube for a pantograph type current collector of the present invention, Figure 1a is a plan view of the main part thereof, and Figure 1b is taken along the line CC in Figure 1a. The cross-sectional view, FIG. 2, and FIG. 3 are main part configuration diagrams of a conventional electric vehicle pantograph. 1... Tram line, 2... Vehicle, 3... Insulator, 4,4'...
Pantograph, 4a...underframe, 4b...bottom frame, 4c...
Bearing part, 4d... Upper frame, 4e... Hinge part, 4f, 4
f'...ceiling pipe, 4g...boat support device, 4h...hull,
SD...Current collector strip, PIP...Metal pipe, COV...Insulation coating.

Claims (1)

[Scope of utility model registration request] It consists of a metal pipe (PIP) having an insulating cover (COV) such as an insulating tube or a coating of an insulating material, and is rotatably connected to the upper frame 4d at the upper apex of the upper frame 4d of the pantograph 4'. A ceiling pipe for a pantograph type current collector, on which a boat body 4h is supported via a boat support device 4g.