RU2056575C1 - Device for cutting in tap into operating pipeline - Google Patents

Abstract

FIELD: pipeline transport. SUBSTANCE: device has branch pipe 1 with flange, intermediate chamber 2, cylinder 3, hollow shaft 4. Placed inside hollow shaft is central shaft 5 connected with electric drive. Secured on end of central shaft is cutting tool 6. Hollow shaft 4 is rigidly secured in cylinder 3 over diagonal. Intermediate chamber has support bearings and sealing arrangements. Cylinder is fixed in position by means of screw 10 and bushing 5. Electric drill is used as electric drive. EFFECT: enlarged operating capabilities. 2 cl, 1 dwg

Description

 The invention relates to a pipeline transport of liquids and can be used when connecting branches to an existing pipeline without reducing the pressure in it.

 A device for connecting bends to an existing pipeline [1], the adapter pipe of which and the cutting tool chamber are separated by a locking element, and the cutting tool is mounted on a drive shaft movable in the direction of the pipe axis, made in the form of a cutting head with an individual drive and a rod with a polished roller stop while the rod is pivotally mounted on the drive shaft and the drive head is mounted on it.

The device has the following disadvantages:
the operation of an individual drive should be carried out in an aqueous medium, which reduces the reliability of operation and complicates its manufacture;
the impossibility of using small diameter pipelines when inserting, since the placement of an individual drive requires significant dimensions;
the design does not provide the necessary rigidity, which also reduces reliability.

 A device for inserting into the pressure pipe during its operation [2] comprising a housing with a valve, a stem and a drive mechanism located in it, while gears are located on the same axis with the rod, one of which interacts with it by means of a screw pair, and the other by sliding keys and which in turn is meshed with additional gears located on the shaft of the drive mechanism.

This device has the following disadvantages:
the use of a crown as a cutting tool for large diameters requires the application of great effort, a powerful drive with significant dimensions, weight;
labor input in manufacturing;
the diameter of the cut hole is limited by the diameter of the crown.

 The closest in essence and the achieved effect is a device [3] containing a pipe with a flange, a valve, an intermediate chamber, a plate, a hollow shaft with a central shaft located inside it, connected to an electric motor, a cutting head with drives for its longitudinal movement and rotation, mounted on the lower end of the hollow shaft, the centering device, while the drive for longitudinal movement of the cutting head is made in the form of screws with nuts, bearings, couplings mounted on the screws, the coupling is rigidly connected by onshteynov nuts longitudinal displacement drive, the drive rotation of the cutting head is designed as a worm wheel mounted on a hollow shaft interacting with the worm mounted on the additional support.

This device has the following disadvantages:
the complexity and complexity of manufacturing;
significant dimensions of the cutting head, as a result, significant dimensions of the intermediate chamber and the entire device;
the diameter of the cut-out device cannot be equal to the internal diameter of the cut-in nozzle.

 The objective of the proposed technical solution is to simplify the design, increase the reliability of operation.

 This is achieved by the fact that in a device containing a pipe with a flange, a valve, an intermediate chamber, a hollow shaft with a central shaft located inside it and connected to an electric drive, the hollow shaft is mounted diagonally in a cylinder that has an outer diameter equal to the nominal passage of the valve, and installed with the possibility of rotation in the intermediate chamber, which is the supporting-sealing, while the electric drive is an electric drill.

 Rigid fastening of the hollow shaft in the cylinder, the outer diameter of which is equal to the nominal bore of the valve, allows for simplicity of design to ensure rigidity of the cutting tool, increase reliability, reduce the dimensions of the device, since the height dimensions of the intermediate chamber are determined only by the placement of supports and seals. The location of the hollow shaft obliquely in the cylinder, with the ability to rotate, allows you to get the diameter of the cut holes corresponding to the inner diameter of the tested pipe. Placing the support-sealing assembly in the intermediate chamber allows reducing the dimensions of the device and simplifying its design.

 The use of a household electric drill as an electric drive simplifies the design, makes it possible to manufacture it by simple technological methods.

 All of the above distinguishing features allow simple technological methods to produce a simple, reliable, inexpensive device with optimal dimensions, which makes it possible to insert into the existing pipeline during its operation.

 The drawing shows a device, General view.

 The device comprises a pipe 1 with a flange, welded to the existing pipeline, an intermediate chamber 2, a cylinder 3, a hollow shaft 4, inside which there is a central shaft 5 connected to an electric drive, for example, an electric drill (not shown). At the end of the Central shaft 5 is installed a cutting tool 6, for example a finger mill. The hollow shaft is rigidly fixed diagonally in the cylinder 3. At the bottom of the cylinder 3 there is a threaded sleeve 7, which interacts with the threaded tip 8 on the pipeline. The intermediate chamber 2 has thrust bearings, seals. Fixing the position of the cylinder is carried out using the sleeve 9, screw 10, a blind socket on the cylinder.

 The device operates as follows.

 A pipe with a flange 1, a threaded tip 3 are welded to the existing pipeline, a valve is installed, the welds and valves are checked for leaks, an intermediate chamber 2 is connected with the other elements of the device, pressure is created and the tightness of the entire device is checked together with the seal.

 Then, with the valve of the cylinder 3 open, it is lowered into the threaded tip 8 until the threaded sleeve 7 stops. By turning the cylinder 3 clockwise, screw the threaded sleeve 7 onto the threaded tip 8 until a blind hole on the cylinder 3 appears in the window 11. Screw 10 fix the position of the cylinder 3. By turning the cylinder, the central shaft 5 with the cutting tool is installed opposite the least distant point on the pipeline. When the drive is turned on, a hole is drilled into the passage until the central shaft abuts against the pipeline with its protrusion. Ensuring the rotation of the cylinder by one revolution, the milling process is carried out by the side surface of the cutter. The cut out part of the pipeline is held by a threaded tip 8 and does not fall into the pipeline. During the milling process, the central shaft 5 must be raised or lowered to copy the surface of the cut part of the pipeline. This is done by a threaded cup 12.

 Having cut the hole, the screw 10 is released, cylinder 3, under the influence of water pressure in the line, rises to the stop, the valve closes and the installation is dismantled.

 Thus, the proposed technical solution with the simplicity of design reliably provides the ability to insert into the existing pipeline.

Claims (2)

 1. A device for inserting an outlet into an existing pipe, comprising a pipe with a flange, a valve, an intermediate chamber, a hollow shaft with a central shaft located therein connected to an electric drive, and a cutting head, characterized in that the hollow shaft is rigidly fixed diagonally in the cylinder, which has an outer diameter equal to the nominal bore of the valve, and is mounted with the possibility of rotation in the intermediate chamber, which is the supporting-sealing.  2. The device according to p. 1, characterized in that the electric drive is an electric drill.