DE20105447U1 - Deflection devices for supply lines of duct probes - Google Patents

Description

DEFLECTION DEVICE FOR SUPPLY LINES OF SEWER PROBES

The invention relates to a deflection device for supply lines of sewer probes.

Sewer probes in the form of jet nozzles, sewer cleaning hoses, camera probes, sewer robots and the like are used to clean, examine or repair sewers. These are inserted into the sewer pipe from a shaft and then moved through the sewer pipe using a pull rope or recoil-driven. The supply line connected to the sewer probe, for example a pressure hose for sewer cleaning using a jet nozzle, a camera cable or the like, runs from a reel installed on the surface of the earth through the shaft and the sewer pipe and is pulled along by the probe. At the transition point from the shaft to the sewer pipe, the supply line, for example the pressure hose, must be deflected at an approximately right angle. For this purpose, a deflection device of the type mentioned above is used, which rests with its support element on the wall of the shaft and/or the sewer pipe and deflects the hose with little friction using its deflection rollers, so that the hose does not rub against the sewer wall and is also not bent too sharply.

Conventional deflection devices usually have a rigid, banana-shaped frame as a support element, on which several deflection rollers are rotatably mounted. This deflection device is held at the transition point between the shaft and the sewer pipe with the help of a pull rope so that the inside of its curved support element rests against the sewer or shaft wall and its bent ends, equipped with the deflection rollers, protrude partly into the sewer pipe and partly into the shaft. The hose is then guided over the deflection rollers and presses the deflection device against the shaft wall due to its tensile stress.

With conventional deflection devices, the rigid design of the support element predetermines a fixed bending radius for the deflected hose. However, since the sewer pipes can differ in their cross-section and can also extend from the shaft at different angles, it can happen that the existing deflection device is too long for the application in question and has too large a bending radius. The lower branch of the deflection device protrudes

Dipl.-Ing. Jörg Ney

» t· t

26.3.2001

then very far into the sewer pipe and extends to the area of the bottom of the sewer pipe. This has the disadvantage that the lower end of the deflector and the hose above it form an obstacle for the debris that runs out of the sewer pipe when it is cleaned with the jet nozzle. If you try to pull the deflector further back so that the drainage of the sludge is no longer impeded, the lower end of the deflector stands relatively steeply in the sewer pipe and the hose is then bent relatively sharply at this lower end.

The object of the invention is to create a deflection device that can be better adapted to different applications.

This object is achieved according to the invention in that the support element has a plurality of support members which are connected to one another in an articulated manner and which each carry at least one deflection roller.

In the deflection device according to the invention, the support element is flexible so that it can adapt to a wide range of different angles of departure of the sewer pipe from the shaft. When using the deflection device, work is also made considerably easier because the exact position of the deflection device at the transition point between the shaft and the sewer pipe is less critical. Due to its flexibility, the branch of the deflection device that extends into the sewer pipe can lie flat against the pipe wall so that the passage is not blocked even in narrow sewer pipes.

Advantageous embodiments of the invention emerge from the subclaims.

Preferably, the deflection device is designed as a roller chain, i.e. the support links equipped with deflection rollers form a sequence of chain links that are connected to one another in an articulated manner. Not every one of these chain links has to carry a deflection roller. For example, an arrangement is also conceivable in which support links that carry at least one deflection roller alternate with roller-free chain links that only create the articulated connection between the support links.

The axes of the pulleys can also form the axes of the chain joints.

Dipl.-Ing. Jörg Ney , · *··* , · · N^YFJ)2/j)o7fM March 26, 2001

which simplifies the manufacture of the deflection device. On the other hand, the axes of the deflection rollers can also be offset from the joint axes of the chain links. In this case, for a given angular deflection of the chain links, the minimum deflection radius of the hose depends on the offset of the roller axes from the joint axes, so that the hose is prevented from bending too sharply.

On the other hand, it is possible to limit the maximum deflection of the chain links relative to each other by means of stops, so that a minimum deflection radius can be set that is adapted to the flexibility of the hose. It is also conceivable to counteract excessive bending of the hose by elastically pre-tensioning the individual chain links into the stretched position.

In a preferred embodiment, each chain link is formed by two parallel plates, between which, in the case of the support links, the deflection rollers are mounted. The dimensions of these plates are then selected so that the deflection rollers can rotate freely when the plates rest with their edge against the pipe wall or the shaft wall.

Preferably, the plates are also dimensioned in such a way that, together with the deflection rollers, they form a U-shaped channel in which the hose is completely accommodated even when deflected. In this way, damage to the hose in the curved section can be safely avoided.

The deflection device then forms a flexible, U-shaped channel that is open at the bottom and is guided along the hose in a rolling motion like a rider. The deflection device can be pulled into the desired position on the hose using a pull rope.

According to a further embodiment of the invention, the chain links are designed in such a way that the center of gravity is always below the upper vertex of the hose, which rests against the deflection rollers. This ensures that the deflection device automatically assumes an upright position due to its own weight, in which the support surfaces of the support links are facing upwards.

Dipl.-Ing. Jörg Ney * .* I"! . &Idigr; I N£YFJ)2/J)0/i}M March 26, 2001

point.

Optionally, the opposing plates of at least one chain link can be connected by a latch in the area of their lower edge so that the deflection device cannot be detached from the hose even when the hose is guided vertically. This latch is preferably detachable so that the deflection device can be placed on the hose after the latch is released.

In the following, an embodiment of the invention is explained in more detail with reference to the drawing.

Show it:

Figure 1 shows a schematic section through a diversion device in the transition area between a shaft and a sewer pipe;

Figure 2 shows a section of the deflection device in plan view; and

Figure 3 is a section along the line III-III in Figure 2.

Figure 1 shows a schematic vertical section of a sewer pipe 10 which is accessible from the earth's surface via a shaft 12, e.g. an inspection shaft. To clean the sewer pipe 10, a jet nozzle (not shown) is moved through the sewer pipe. The jet nozzle releases water under high pressure onto the pipe wall so that contaminants are loosened and flow away as sludge due to the inherent gradient of the sewer pipe 10. The water is fed to the jet nozzle via a hose 14 (supply line) which is drawn off from a reel (not shown) installed on the earth's surface near the shaft 12 and is connected to a pressure pump (not shown). A deflection device 16 is arranged on the hose to deflect the hose 14 with little friction at the transition point between the shaft 12 and the sewer pipe 10.

The deflection device 16 has a support element 18 in the form of a roller chain, the chain links of which form an alternating sequence of support links 20 and connecting links 22. Two deflection rollers 24 are mounted in each of the support links 20, over which the hose 14 is guided. The connecting

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The connecting members 22 serve only for the articulated connection of the support members 20. In the example shown, the joint axes between the support members 20 and the connecting members 22 coincide with the rotation axes of the deflection rollers 24.

Furthermore, in the example shown, both the support members 20 and the connecting members 22 are designed in such a way that they are supported on the upper apex of the sewer pipe IO and, if necessary, also on the side wall of the shaft 12 and keep the hose 14 running over the deflection rollers at a distance from the walls of the sewer pipe and the shaft. The deflection rollers 24 can rotate freely in the support members 20.

In the example shown, the support links 20 and the connecting links 22 have matching outer contours, so that both types of chain links can be supported on the pipe wall or the channel wall. Alternatively, however, a design would also be conceivable in which the connecting links 22 are narrower, so that only the support links 24 are supported on the pipe wall. Conversely, a design is also conceivable in which the support links 20 are narrower and are only indirectly supported on the pipe wall via the connecting links 22.

In the example shown, the pivoting movement of the support members 20 and the connecting members 22 relative to one another is limited by stops 26 such that the radius of curvature of the hose 14 is always greater than a certain limit value, below which damage to the hose could occur.

The support element 18 forms a flexible, U-shaped channel which is open on the underside (in the horizontally running hose section) and accommodates the entire hose cross-section, so that the hose 14 is protected against damage. Weights 28 attached to the lower edges of the connecting links 22 ensure that the center of gravity of the support element 18 lies below the upper apex of the hose when the hose is running essentially horizontally, so that the support element automatically assumes a position due to its own weight in which the deflection rollers 24 roll on the upper side of the hose. With the aid of a traction cable 30, the support element 18 can be moved in a rolling manner in the longitudinal direction of the hose 14 until it reaches the

Dipl.-Ing. Jörg Ney ··"·.· &idigr; *φ\ I?2 /JOO / J3M March 26, 2001

has reached the desired position at the transition point between the shaft 12 and the sewer pipe 10. The support element is then held in this position with the help of the traction cable 30, while the tension of the hose 14 ensures that the chain links rest against the wall of the sewer pipe. Since the branch of the support element 18 running inside the sewer pipe 10 can cling to the upper pipe wall, there is sufficient space below the support element even with a narrow pipe cross-section, which allows the sludge that accrues during pipe cleaning to flow away unhindered.

As can be seen in Figures 2 and 3, the support members 20 are each formed by two parallel, congruent plates 32, between which the two deflection rollers 24 are rotatably mounted. Accordingly, the connecting members 22 are also formed by parallel plates 34, which each rest against the outer surfaces of the plates 32 of the support members 20.

In at least one of the support members 20 or the connecting members 22, a releasable latch 36, for example in the form of a pin inserted through the plates 32, is provided on the side of the hose 14 opposite the deflection rollers 24, with which the support element 18 is secured on the hose 14.

Claims (10)

1. Deflection device for supply lines ( 14 ) of channel probes, with deflection rollers ( 24 ) which are rotatably mounted on a support element ( 18 ), characterized in that the support element ( 18 ) has a plurality of support members ( 20 ) which are connected to one another in an articulated manner and which each carry at least one deflection roller ( 24 ). 2. Deflection device according to claim 1, characterized in that the support element ( 18 ) has the shape of a roller chain, in which at least every second chain link is formed by one of the support links ( 20 ). 3. Deflection device according to claim 2, characterized in that the support element ( 18 ) is formed by an alternating sequence of support members ( 20 ) and connecting members ( 22 ) without deflection rollers. 4. Deflection device according to claim 2 or 3, characterized in that each support element ( 20 ) carries at least two deflection rollers ( 24 ). 5. Deflection device according to one of the preceding claims, characterized in that the articulation axes of the chain links ( 20 , 22 ) coincide with the axes of rotation of the deflection rollers ( 24 ). 6. Deflection device according to one of the preceding claims, characterized in that the support element ( 18 ) forms a channel which is limited on one side by the deflection rollers ( 24 ) and is open on the opposite side. 7. Deflection device according to claim 6, characterized in that the depth of the channel is greater than its width, so that the entire cross-section of the supply line ( 14 ) can be accommodated in the channel. 8. Deflection device according to claim 6 or 7, characterized in that the center of gravity of the support element, when oriented substantially horizontally, lies below the lower apex of the deflection rollers ( 24 ) rolling on the supply line ( 14 ). 9. Deflection device according to one of claims 6 to 8, characterized in that the channel formed by the support element ( 18 ) can be closed at the open end by at least one releasable latch ( 34 ). 10. Deflection device according to one of the preceding claims, characterized in that the pivoting movement of the support members ( 20 ) relative to one another is limited by stops ( 26 ).