Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent
1997-02-28
1998-09-01
Dang, Hoang C.
Wells
Means for perforating, weakening, bending or separating pipe...
With disparate below ground feature
175 77, 409143, E21B 2900, B23C 300
Patent
active
057997292
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a device for working the interior of pipes, conduits or the like, which carries a working apparatus and has a controllable drive facility for the apparatus guidance.
Such a device which permits examining conduits for damage in an economical manner, and when needed, working on damage sites with various tools from the pipe interior is known from German patent 42 43 529. The conduit does not need to be exposed from the outside for this.
A compact construction is desirable for such a device, which makes possible the use of the device even with pipes of small diameter. Furthermore, from a technical perspective, a movement control for the device from outside the pipe is required, which permits complicated work procedures. However, there lies a difficulty in the fact that, in order to implement complicated sequences of movement, a considerable expenditure must be put forth for motive power of the working apparatus, which runs counter to the requirement for a compact construction.
The known device accomplishes the objective which imposes itself of constructing the device in a compact manner, but nonetheless in a manner suitable for implementing complicated sequences of movement for the working apparatus with a drive design which has the following particularities:
a) The drive facility has individual drives which are independent of each other, one of which as a linear drive makes possible the displacement of a work panel carrying the working apparatus longitudinally in the pipe, while another is constituted as a rotational drive for rotation of the work panel around the pipe axis or around an axis parallel to this, and a further one serves as a radial drive to move the work panel in a direction transverse to the pipe wall.
b) The device has an inner and an outer casing at least partially surrounding this.
c) Each individual drive includes its own gearing unit with a direct current motor actuating it, whereby the motors for linear and rotational drive are accommodated in the inner casing.
d) For executing the linear motion, the inner casing is longitudinally movable in relation to the outer casing.
This device, which belongs to the state of the art, was further developed from a conduit renewing device known from German Patent 43 11 365 in such a way that the inner casing is guided conducted in a sleeve bearing acting directly between the inner and outer casing when it is displaced relative to the outer housing.
SUMMARY OF THE INVENTION
Proceeding from this state of the art, underlying the invention is the objective of constructing such a device so that it has an especially assembly- and maintenance-friendly construction, and can be adapted in a simple manner to the particular conditions of various applications when changing equipment, while retaining the advantages of the known devices with regard to compact design and a drive design allowing complicated motions of the working apparatus.
The solution of this objective takes place by the device having the features presented in the claims.
Advantageous further configurations of the device of the invention are described in the subclaims.
A basic feature of the invention is the modular construction of the claimed device from preassemblable subassemblies. These can be easily interchanged, be it for maintenance or be it for adapting the device to altered application conditions. Basic components of the apparatus are arranged on plates adapted to the cross section of the inner casing. The various subassemblies need only be joined together one behind the other for assembly. After this, the inner casing can be slid over the assembled arrangement of subassemblies. A very simple and rapid assembly is possible owing to the skeleton-type construction with the mounting plates as "ribs. "
The inner casing can be removed from the subassemblies for maintenance. After this, the entire internal mechanics and electronics of the apparatus are exposed. The subassemblies can be examined individually without it being necessary to disass
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Breckwoldt Frederik
Lammerhirt Markus
D.T.I.Dr. Trippe Ingenieurgesellschaft mbH
Dang Hoang C.
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