DE20213486U1 - Guide roller for contact wire pull on the side holder - Google Patents

Description

Guide roller for contact wire pull on side holder Description

The invention relates to a device for fastening a contact wire of an overhead line to a side bracket of a boom, in particular of an overhead line mast, during pulling and tensioning of the contact wire. This pulling and tensioning of the contact wire takes place when the contact wire of the overhead line is newly installed or replaced. Overhead lines to which the invention relates are used in particular in railways and trolleybuses, so-called trolleybuses.

During operation, the contact wire of an overhead line is laid under mechanical tension in the longitudinal direction. This mechanical tension is generated at both ends of the contact wire by guy wires, where the contact wire is tensioned with weights, particularly concrete weights. Between the guy wires, the contact wire is held at overhead line support points on overhead line masts with side brackets at a certain height above the top edge of the road. In addition, the side brackets hold the contact wire in a so-called zigzag pattern to ensure even abrasion of vehicle pantographs. The purpose of the mechanical guy wires is to ensure that the contact wire bends downwards as little as possible between the individual side brackets.

When installing or replacing the contact wire of the overhead line on a route, the contact wire is first attached in a movable manner to the respective side bracket of the boom. The contact wire is then laid with a little more length than necessary to the side bracket of the boom of the next, following overhead line mast. Once the contact wire has been completely laid between two tensioning structures, it is mechanically tensioned at both ends to the final operating tensile force, which depends on the type of superstructure. The contact wire moves between 30 cm and 90 cm in the movable bearing on the side brackets and is clamped in a side bracket clamp when the final tensile force is reached and thus its final position on the side bracket.

The state of the art is that the new contact wire is attached to the side bracket of the boom with copper wire or with an S-shaped hook, so-called S-hook, so that it can move in the pulling and bracing direction during pulling and bracing. The attachment with copper wire or S-hook is very cost-effective.

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Copper wire fastening is preferred in particular because the corresponding copper wire is available in large quantities when installing the overhead line, copper wire is easy to handle and requires little or no effort in training the installation personnel.

However, these advantages of the state of the art are offset by some disadvantages:

- The contact wire is very often mechanically damaged when it is pulled by the copper wire fastening or the S-hook. This causes unevenness on the contact surface between the contact wire and the pantograph, which increases over the course of the operating time, leads to an arc and burn-off between the contact wire and the pantograph and thus shortens the service life of the contact wire.

During installation, the contact wire can twist around its longitudinal axis - sometimes several times - so that it must be turned back again in a subsequent inspection.

- The contact wire can get jammed in the copper wire fastening or the S-hook, so that the side holder often becomes slanted when pulling and tensioning. This occurs mainly in curves in the line, where the pulling and tensioning direction of the contact wire is slightly slanted compared to the pulling and tensioning direction in the straight line. The result is a lot of checking to check the position of the side holders and, if necessary, to return them to their required position. Only then is it possible to transfer the contact wire to the tensioning system.

- Due to the contact wire becoming jammed in the copper wire fastening or the S-hook, the side holder also becomes partially sideways to such an extent that the side holder is damaged. In particular, the insulators of the side holder break.

If the contact wire becomes jammed in the copper wire fastening or the S-hook, further pulling and tensioning of the contact wire will result in a sudden release of the jam. This causes jerky movements in the contact wire, which prevent the contact wire from being tensioned in a defined, continuous manner.

Due to the contact wire becoming jammed in the copper wire fastening, the copper wire may tear during installation due to tensile forces. This tearing

usually happens when the operating personnel, who usually install the contact wire at night, have already moved several hundred meters away from the point of the break. It therefore happens unnoticed. Furthermore, the breaking of a single copper wire fastening can lead to a chain reaction-like breaking of other copper wire fastenings, which can sometimes result in several hundred meters of contact wire being torn down.

- Especially in curves, there is a risk of the copper wire fastening breaking due to increased transverse tensile forces, so that further measures must be taken to secure the contact wire in this area.

- Clamping the contact wire into the side holder clamp is made more difficult by the copper wires or S-hooks used, as the screws of the side holder clamp are covered by the copper wire or the S-hook.

Fastening with S-hooks is dangerous because the contact wire can fall out of the open S-hook.

Up to now, these disadvantages of the state of the art have been tolerated by the operator of the line and the client of the construction or maintenance work on the overhead line due to the financial savings during the construction phase - attaching the contact wire to the side bracket with copper wire or S-hooks is cheap. However, the operators of the line and the clients of the construction or maintenance work on the overhead line are increasingly taking into account not only the costs during the construction phase but also the operating costs of the line and the subsequent costs for the maintenance of the overhead line, the so-called life cycle costs (LCC). Measures and devices that reduce construction costs but subsequently increase operating costs and maintenance costs to an unacceptable extent can no longer be accepted in the future.

It is therefore an object of the invention to provide a simple device which, with little effort, movably fastens the contact wire during pulling and guying to the side holder of a boom in the pulling and guying direction without damaging it or other parts of the overhead line and without endangering the safety of the working personnel.

This object is achieved in conjunction with the preamble of the main claim by the features specified in claim 1. Advantages of the invention over the prior art are:

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By unrolling the contact wire on at least one guide roller, the contact wire is not damaged and is therefore laid gently. This increases the service life of the contact wire, reduces maintenance costs and extends the maintenance intervals of the contact wire.

- Due to the continuous rolling movement of the contact wire on at least one guide roller, the contact wire cannot become jammed in the device, so that the side supports always remain automatically positioned in their required and final position. There is no need to carry out any checks after pulling and unclamping the contact wire in order to reposition the side supports in their required position.

- Furthermore, the continuous movement of the contact wire on at least one guide roller enables defined tensioning.

According to claim 2, at least one of the guide rollers is made of a softer material than the material of the contact wire. The advantage here is additional protection of the contact wire, since the material of the guide roller and not the contact wire wears out during pulling and tensioning.

Claim 3 contains an advantageous embodiment of claim 2. Copper is usually used as the material for the contact wire due to its conductivity. The metal brass specified in claim 3 for at least one of the guide rollers is a softer material than copper and thus leads to the advantages of claim 2.

Claims 4 to 6 contain advantageous embodiments for the shape of a guide roller. In particular, a recess in the direction of rotation of at least one of the guide rollers and/or a guide roller designed in the form of a second-order surface - in particular a hyperboloid or paraboloid shape - ensures that the contact wire is guided primarily in the middle of the guide roller. The advantage of this embodiment is improved guidance of the contact wire without touching the side parts of the bracket construction.

Claim 7 specifies a device in the form of a bracket construction with which the guide roller or the guide rollers are fastened to the side holder, wherein claim 8 contains an embodiment of claim 7. The advantage of this bracket construction is that the side holder clamp is not covered, so that easy insertion into the side holder clamp is possible.

Claim 9 contains a device for locking the bracket structure, which is attached to the bracket structure in a height-adjustable manner. The advantage of this device is that it reliably prevents the contact wire from falling out of the bracket structure. The locking mechanism is also rotatably mounted around the bracket structure to enable the contact wire to be removed from the bracket structure for clamping into the side holder clamp.

The invention is explained in more detail below using the embodiments of Figures 1 to 3. The figures show in

Fig. 1 a guide roller with the bracket construction and the height-adjustable locking mechanism in plan view,

Fig. 2 the guide roller with the bracket construction and the height-adjustable locking mechanism in side view,

Fig. 3 the guide roller with the bracket construction, which is attached to a hole at the tip of the side holder.

In Fig. 1, the guide roller (1) with the bracket construction (2), the height-adjustable locking device (4) and the clamping device (5) is shown in plan view and in Fig. 2 in side view. On the guide roller, which is arranged to rotate freely around the axis (6), the contact wire (3) moves perpendicular to (Fig. 1) or in the direction of (Fig. 2) the drawing plane. The contact wire of the overhead line is installed using the device according to the invention shown in Fig. 1 as follows:

1. The bracket construction (2) is, as shown in Fig. 3, hooked into a hole (10) of the side holder (8) using a hook (6) of the bracket construction including guide roller and locking mechanism.

2. The contact wire (3) is then placed in the bracket construction (2) on the guide roller (1) and the locking mechanism (4) is closed.

3. After the contact wire has been inserted into all relevant side supports, the contact wire is tensioned at both ends.

4. Once the contact wire has reached its operating tensile force, which depends on the type of superstructure, the locking mechanism on the bracket structure is opened, the contact wire is lifted out of the bracket structure and clamped into the side holder clamp (9).

5. The bracket construction is removed from the side holder again, the installation of the contact wire is complete.

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Reference symbols Leadership role 1 Bracket construction 2 Contact wire 3 Locking 5 4 Clamping device 5 Rotation axis for the F 6 Hook 7 Side holder 8th Side holder clamp O9 drilling 10

Claims (9)

1. Device for fastening a contact wire of an overhead line to a side holder of a boom of an overhead line mast during pulling and tensioning of the contact wire, characterized in that the contact wire is guided in the region of the tip of the side holder over at least one guide roller which can rotate in the pulling and tensioning direction. 2. Device according to claim 1, characterized in that at least one of the guide rollers is made of a softer material than the material of the contact wire. 3. Device according to claim 2, characterized in that at least one of the guide rollers is made of brass. 4. Device according to one or more of claims 1 to 3, characterized in that at least one of the guide rollers is cylindrically shaped. 5. Device according to one or more of claims 1 to 4, characterized in that at least one of the guide rollers is cylindrically shaped and has a recess in the circumferential direction of the guide roller for guiding the contact wire in the transverse direction of the guide roller. 6. Device according to one or more of claims 1 to 5, characterized in that at least one of the guide rollers is designed in the form of a second-order surface. 7. Device according to one or more of claims 1 to 6, characterized in that the guide roller or the guide rollers is or are suspended in a bore at the tip of the side holder by means of a bracket construction. 8. Device according to claim 7, characterized in that the bracket construction is made of round steel. 9. Device according to one or more of claims 1 to 8, characterized in that the contact wire running over the guide roller or rollers is secured against possible falling out by means of a locking device which is height-adjustable and lockable and is attached to the bracket construction.