RU2350828C1 - Device to pull cable through pipeline - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: there is carcass carriage with support guide rollers that incorporates cones mounted on carriage to vary thrust by partial or complete shutting-off of fluid medium passage channel.

EFFECT: pulling cable through pipeline without cutting off working medium feed.

3 dwg

Description

The invention relates to the processing of the inner surface of the main pipeline, in particular for pulling the cable inside the working pipeline at the preparatory stage of work.

A device for cleaning the inner surface of pipelines from foreign impurities (Pat.2048932 RU, MPK6 V08V 9/04, publ. 11/27/95). The device comprises a shaft on which the first turbine and the second turbine of smaller diameter are rigidly fixed, the turbines are surrounded by a cylindrical body having an opening.

The device uses the differential pressure of the working medium in the pipeline for its movement, but is not a tractor.

A device for coating on the inner surface of the pipeline, which has a supporting guide rollers (Aut. St. No. 1733833, F16L 58/02. Bull. N18 from 05/15/92).

The device uses a cable, but is not a tractor.

The objective of the invention is to use the device as a tractor for pulling a cable inside a working pipeline at the preparatory stage of work, for example, using this cable to transport an extruder when applying a polymer coating to the inner surface of the pipeline.

The technical result of the invention is to use the pressure of the working fluid flow in the main pipeline to move the device installed on the support guide rollers, and pull this device cable, suitable for transport work inside the pipeline.

The achievement of the technical result is ensured by the fact that the device for pulling the cable inside the pipeline, transporting the working medium under pressure, containing a trolley with guide track rollers, while on the frame of the trolley there is an outer cone with a hole in which the middle and inner cones are interconnected, interconnected by a tension spring, a cable is fixed to the top of the inner cone; the carcass frame has a limiter for moving the middle cone; it operates without disconnecting the main pipeline about transporting the working medium, uses the energy of the flow of this medium for its movement, has the property of self-regulating the speed of movement, depending not only on the parameters of the working fluid flow, but also the resistance created by the cable when it is pulled inside the pipeline due to the channel cross-section for the passage of the working medium .

Figure 1 shows a cross section of the main pipeline with a movable device for pulling a cable that is attached to the inner cone, when the device is in the mode of adjustable magnitude of traction.

Figure 2 shows a fragment of the device in maximum thrust.

Figure 3 shows a fragment of the device at the final stage of pulling the cable.

Inside the pipeline 1 (see figure 1) is a working medium 2 (gas, liquid) under pressure. Supporting rollers 5 are located on the carcass 3 of the carriage of the mobile device for pulling the cable 4. In the carcass 3, the outer cone 6 is fixed with an opening, and the middle cone 7 and the inner cone 8 are installed in series. The middle cone 7 and the inner cone 8 are connected by a tension spring 9. A cable 4 is fixed to the top of the inner cone 8, which is located in the guide 10 of the frame 3. The frame 3 has a limiter 11 for moving the middle cone 7.

The operation of the device is as follows. A device for pulling the cable, as well as a coil with a supply of cable (not shown), is introduced into the pipeline receiver, disconnected from the flow of the working medium. The inlet of the pipeline 1 is sealed and connected to the supply system of the working medium 2 under pressure. The working fluid flows through the channel between the outer cone 6 and the interconnected middle cone 7 and the inner cone 8, the differential pressure of the working medium arising on these cones creates a traction force, which is transmitted from the inner cone 8 to the cable 4. The middle cone 7 abuts against the limiter 11 and pushes the frame 3 of the device, which moves on the guide rollers 5 inside the pipeline 1. The inner cone 8, interconnected by a tension spring 9 with the middle cone 7, pulls the cable 4, unwinding it from the coil located in the receiving ke pipeline. With increasing resistance to movement of the cable 4, the frame 3 with the outer cone 6 will move along the flow of the working medium 2, decreasing the channel between the cones and increasing the resistance to overflow of the working medium in this channel, while the traction on the cable 4 increases. The maximum traction force is achieved when the channel is completely closed between the cones (see figure 2). With the full stretching of the cable 4 or in the case when the resistance to movement of the cable increases significantly and the pressure force of the working medium 2 on the middle cone 7 exceeds the resistance force of the tension spring 9, this spring increases its length (see figure 3), the middle cone 7 moves away from the inner cone 8, opening the channels for the flow of the working medium 2. The tension of the spring 9 is limited by the distance between the limiter 11 and the guide 10 of the frame 3, as well as the dimensions of the middle 7 and inner 8 cones.

A positive effect is expressed in the possibility of using the device as a tractor for pulling the cable inside the pipeline transporting the working medium.

Claims (1)

A device for pulling a cable inside a pipeline transporting a working medium under pressure containing a trolley with guide track rollers, characterized in that an outer cone with a hole is fixed on the carriage frame, in which the middle and inner cones are interconnected by a tension spring, fixed to the top of the inner cone cable, carcass frame has a limiter for moving the middle cone.

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