EP2934774A1 - Device for cleaning of pipes - Google Patents

Device for cleaning of pipes

Info

Publication number
EP2934774A1
EP2934774A1 EP13865432.2A EP13865432A EP2934774A1 EP 2934774 A1 EP2934774 A1 EP 2934774A1 EP 13865432 A EP13865432 A EP 13865432A EP 2934774 A1 EP2934774 A1 EP 2934774A1
Authority
EP
European Patent Office
Prior art keywords
cutter head
pipe
cleaning
pipes
folding cutting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13865432.2A
Other languages
German (de)
French (fr)
Other versions
EP2934774A4 (en
EP2934774B1 (en
Inventor
Ulf ENGLUND
Sven RYDMAN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renzorato AB
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2934774A1 publication Critical patent/EP2934774A1/en
Publication of EP2934774A4 publication Critical patent/EP2934774A4/en
Application granted granted Critical
Publication of EP2934774B1 publication Critical patent/EP2934774B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/043—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes
    • B08B9/045—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes the cleaning devices being rotated while moved, e.g. flexible rotating shaft or "snake"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/043—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes
    • B08B9/0436—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes provided with mechanical cleaning tools, e.g. scrapers, with or without additional fluid jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/40—Single-purpose machines or devices for grinding tubes internally
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G3/00—Rotary appliances
    • F28G3/10—Rotary appliances having scrapers, hammers, or cutters, e.g. rigidly mounted
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G3/00—Rotary appliances
    • F28G3/10—Rotary appliances having scrapers, hammers, or cutters, e.g. rigidly mounted
    • F28G3/14—Rotary appliances having scrapers, hammers, or cutters, e.g. rigidly mounted thrown into working position by centrifugal force

Definitions

  • the present invention relates to a device for cleaning of pipes according to the preamble of claim 1.
  • Background When pipes such as water pipes and sewage pipes etc. age, problems often arise with time, e.g. , deposits may accumulate at the bottom of the pipe, the pipe wall may break due to roots penetrating there through, etc.
  • a more modern alternative to the complete replacement of an old pipe with a new in places where this is difficult and costly is to instead clean out deposits etc. from the old pipe in order to thereafter recondition the old pipe by inserting a new pipe inside the old. In this way, an even and impermeable inner pipe wall is obtained without having to remove the old pipe.
  • a new pipe in the old one may after the cleaning out provide the old pipe with a lining, i.e. to build up a new inner wall in the pipe by coating the inner wall of the old pipe with a layer of material, also called
  • the casing pipe may for example be a flexible porous tubular body made of synthetic material soaked with epoxy or other plastic material, e.g. polyester felt impregnated with epoxy, where the epoxy or the other plastic material stiffens after installation inside the pipe, usually cures under pressurization of that inside the pipe installed initially flexible lining.
  • One way of lining old pipes with flexible casing pipes is to use a flexible casing pipe turned inside out, where its one end is firstly turned right so that this one end with the outer wall of the casing pipe directed outwards may be placed against and be held against the inner wall of the old pipe where
  • the device for cleaning of pipes comprising a cutter head also comprises the features that the cutter head comprises a body and at least three on the body articulately arranged folding cutting devices, where the in the cleaning direction arranged end of the respective folding cutting device is arranged under the influence of centrifugal force generated by rotation of the cutter head to be folded out in a direction away from the longitudinal axis of the cutter head, and where further the respective folding cutting device comprises at least one cutter which in the folded out position of the respective folding cutting device is arranged for milling in the cleaning direction, is obtained the advantage of that one may put a load on the cutter head with a feed force in the forward direction inside the pipe without that the folding cutting devices are folded in even if something in the pipe obstructs the forward movement which makes it possible that with a large feed force and relatively fast feed movement to clean out the pipe both fast and efficient.
  • the respective folding cutting device comprises at least one cutter which in the folded out position of the respective folding cutting device is arranged for milling in the cleaning direction, the advantage that the inside of the pipe itself is not milled whereby a stiffened lining may be removed without damaging the inside of the pipe which is particularly important at pipes with already damaged pipe walls.
  • a further advantage is that the folding cutting devices are folded forwards and in the direction inwards towards the longitudinal axis of the cutter head when the cutter head is pulled out backwards out of the pipe, whereby the risk that the cutter head gets caught inside the pipe is minimized.
  • Figure 1 shows schematically a section of a device for cleaning of pipes according to an embodiment of the invention
  • Figure 2 shows schematically a view from the front of the device according to figure 1
  • Figure 3 shows schematically a section of another embodiment of a device for cleaning of pipes according to the invention.
  • Figure 1 shows schematically a section of a device 2 for cleaning of pipes according to an embodiment of the invention, where the device is shown in its folded out operating position inside a pipe 1.
  • the device 2 for cleaning of pipes 1 is intended for pipes 1 with a substantially circular cross section.
  • the device 2 comprises a cutter head 4 which when the cutter head 4 in operation rotates about its longitudinal axis X fits within the inner diameter d of the pipe, where the cutter head 4 further is arranged during rotation of the same to be able to be fed forward inside the pipe in a cleaning direction R parallel to the longitudinal direction L of the pipe and with the longitudinal axis X of the cutter head 4 substantially aligned parallel to and concentrically to the centre axis C of the pipe for milling of obstacles in the pipe 1.
  • the cutter head 4 comprises a body 6 and at least three on the body articulately arranged folding cutting devices 8, 10, 12, 14.
  • the invention is illustrated with an embodiment with four folding cutting devices 8, 10, 12, 14, where the folding cutting device "14" is not shown in figure 1 - for those reference numerals below not shown in figure 1, see figure 2.
  • the folding cutting devices 8, 10, 12, 14 are at least three in number, and are preferably arranged symmetrically about the longitudinal axis X of the cutter head 4, in order to decrease the risk for that the cutter head 4 is tilted in the pipe 1 during operation.
  • the respective folding cutting device 8, 10, 12, 14 is arranged under the influence of centrifugal force F c generated by rotation of the cutter head 4 to be folded out in a direction away from the longitudinal axis X of the cutter head 4, and where further the respective folding cutting device 8, 10, 12, 14 comprises at least one cutter 24, 26, 28, 30 which in the folded out position of the respective folding cutting device 8, 10, 12, 14 is arranged for milling in the cleaning direction R.
  • this cutter 24, 26, 28, 30 is arranged in the first place to mill away obstacles that are situated close to the inner wall 3 of the pipe 1, e.g. stiffened lining which is stuck against the inner wall 3 of the pipe 1.
  • the at least one cutter 24, 26, 28, 30 may either be arranged as is shown at 24 and with continuous lines at 28, i.e. substantially perpendicularly in relation to the longitudinal axis X of the cutter head 4 in the folded out position of the respective folding cutting device 8, 10,12,14, or as is shown with broken lines at 28, i.e. at an acute angle to the longitudinal axis X of the cutter head 4, if arranged as at 24, the outermost end of the cutter gets stronger, if arranged as in dashed lines at 28 the outermost end of the cutter is guided even better along the inner wall 3 of the pipe 1.
  • the invention will be described with the embodiment according to what is shown at 24 and with continuous lines at 28.
  • the folding cutting devices 8, 10, 12, 14 may for example be articulately arranged on the body 4 by that the body 4 and the folding cutting devices 8, 10, 12, 14 have holes 5; 9, 11, 13, 15 (see Figure 2) through which bolts 17, 19, 21, 23 (see also Figure 2) are arranged to articulately hold the folding cutting devices 8, 10, 12, 14 on the body 4.
  • the respective folding cutting device 8, 10,12,14 comprises at least two cutters 24, 26, 28, 30; 32, 34, 36, 38 which in the folded out position of the respective folding cutting device 8, 10,12,14 are arranged for milling in the cleaning direction R, where the, seen in the radial direction r, outermost cutter 24, 26, 28, 30 in the folded out position of the respective folding cutting device 8, 10,12,14 is arranged substantially perpendicular in relation to the longitudinal axis X of the cutter head and where a radially r seen inside of this outermost cutter 24, 26, 28, 30 arranged inner cutter 32, 34, 36, 38 in the folded out position of the respective folding cutting device 8, 10,12,14 is arranged at an acute angle a to the longitudinal axis X of the cutter head.
  • the, seen in the radial r direction, outermost cutter 24, 26, 28, 30 is arranged to mill away obstacles that are close to the inner surface of the pipe 1, e.g. stiffened lining that is stuck against the inner wall of the pipe 1, and preferably the radially r seen inside of this outermost cutter 24, 26, 28, 30 arranged inner cutter 32, 34, 36, 38 is arranged to mill away obstacles that are situated at a distance from the inner wall 3 of the pipe 1, e.g. to pulverize stiffened lining that the outermost cutter 24, 26, 28, 30 has loosened from the inner wall 3 of the pipe 1.
  • at least one further cutting device 40 is arranged on the in the cleaning direction R arranged end 42 of the body 6.
  • this cutting device 40 comprises at least one cutter 44, but preferably at least two cutters 44, 46 arranged on each side of the longitudinal axis X of the cutter head. This cutting device 40 mills away those obstacles in the pipe 1 that the other cutting devices 8, 10, 12, 14 do not reach, e.g. to mill away and pulverize a thin stick of stiffened lining at the centre C of the pipe 1.
  • those cutters 24, 26, 28, 30, 32, 34, 36, 38, 44, 46 which in different combinations can exist on the cutter head 4 depending on the number of cutters 24, 26, 28, 30, 32, 34, 36, 38, 44, 46 and the number of folding cutting devices 8, 10, 12, 14 are arranged in such a way that they in the folded out position of the folding cutting devices 8, 10, 12, 14 at rotation of the cutter head 4 about its longitudinal axis X together move substantially over the whole cross section surface of the pipe 1 inside the inner wall 3 of the pipe 1.
  • the respective folding cutting device 8, 10, 12, 14 is further arranged with a guide surface 48, 50, 52, 54 which in the folded out position of the respective folding cutting device 8, 10, 12, 14 is arranged radially r on the respective folding cutting device 8, 10, 12, 14, there extends in parallel with the longitudinal axis X of the cutter head 4 , and in the rotation direction of the cutter head 4 is there adapted to the curvature of the inner wall 3 of the pipe 1, in order with the guide surfaces 48, 50, 52, 54 to facilitate centering of the cutter head 4 in the pipe 1.
  • the guide surfaces 48, 50, 52, 54 may be coated with friction decreasing material such as for example Teflon ® .
  • the device preferably comprises a drive member 56 with which the cutter head 4 is arranged to be fed forward inside the pipe 1 in a cleaning direction R and with which the cutter head 4 is arranged to be able to be rotated about its longitudinal axis X, where the drive member 56 further is arranged to be able to take up press force in its axial direction A along the longitudinal direction L of the pipe, whereby a feed force F M can be applied on the cutter head 4 in the longitudinal direction L of the pipe.
  • the cutter head 4 may in operation be rotated with for example a speed of about 2500-3000 rotations per minute in order to ensure the folding out of these.
  • the drive member 56 is preferably a wire or a rod. If wire is used, there exists specially twisted wire that manages large press forces without that the wire is bent in its longitudinal direction.
  • the drive member 56 is in turn driven preferably by hydraulics. E.g., a hydraulic pump with variable pressure from 0 up to 180 bars can be used for the drive, which in turn for example can be driven with a combustion engine or an electrical plant.
  • the device 2 further comprises a hose 58 for water V arranged about the drive member 56 with which hose 58 water V can be conveyed to the cutter head 4 for cooling of the same during operation and to decrease the friction forces between the cutter head 4 and the inner wall 3 of the pipe 1 during operation by that a lubricating film of water V positions itself between the radial r ends of the folding cutting devices 8, 10, 12, 14 and the inner wall 3 of the pipe 1.
  • the drive member 56 has a diameter of e.g. 12 mm
  • the surrounding hose may e.g. have a diameter of 20 mm.
  • the respective folding cutting device 8, 10, 12, 14 is in its folded out position arranged seen in the direction of the longitudinal axis X of the cutter head 4 to extend in its radial r direction at least in a partial section 60 at an angle separated from the direction of the longitudinal axis X of the cutter head 4 , whereby the folding cutting devices 8, 10, 12, 14 at rotation of the cutter head 4 inside the pipe 1 are arranged to feed possible water V and/or pulverized material from e.g. the lining 62 in the pipe 1 away from the cutter head 4.
  • the respective cutters 24, 26, 28, 30, 32, 34, 36, 38, 44, 46 preferably comprise sharp cutter edges 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, i.e. with edge angle less than 90°, and/or are coated fully or partly with corresponding protruding bodies of hard material, such as for example cutter teeth made of Coromant ® .
  • outermost cutters 24, 26, 28, 30 in the folded out positions of the respective cutting devices 8, 10, 12, 14 are arranged substantially perpendicular in relation to the longitudinal axis X of the cutter head 4 and the radially r seen inside of these outermost cutters 24, 26, 28, 30 arranged inner cutters 32, 34, 36, 38 in the folded out position of the respective cutting device are arranged at an acute angle a to the longitudinal axis X of the cutter head 4, it is possible for best results to use positive cutters with larger relief angle at the, seen in the radial r direction, outermost cutters 24, 26, 28, 30 than at the inner cutters 32, 34, 36, 38, as the outermost cutters 24, 26, 28, 30 are loaded by substantially axial X forces whereas the inner cutters are loaded both by axial X and radial r forces.
  • the relief angles may be of the order of magnitude of 5° resp. 10°.
  • one, seen in the radial r direction, outermost cutter 24, 26, 28, 30 is arranged to extend in radial direction r with a distance s corresponding to the thickness t of the lining in the folded out position of the respective cutting device 8, 10, 12, 14 when one uses the device 2 to remove stiffened lining 62 from the inside of a pipe 1.
  • other obstacles such as for example roots or solidified concrete etc. may be simultaneously removed from the pipe.
  • the outer wall 84 of the pipe, and the outer diameter D of the pipe are also shown.
  • the respective folding cutting device 8, 10, 12, 14 is preferably arranged with a respective stop surface 86, 88, 90, 92 which in the folded out position of the respective folding cutting device 8, 10, 12, 14 is arranged to abut against a respective corresponding stop surface 94, 96, 98, 100 on the body 4 and thereby block further folding out of the respective cutting devices 8, 10, 12, 14.
  • the maximum diameter of the cutter head in the radial r direction can for example be limited to some or a few mm less than the inner diameter d of the pipe 1.
  • the reference numerals 88; 92; 96 and 100 are not shown in the figures but indicate parts of the folding cutting devices 10, 14 resp. housing 6 which correspond to those with the reference numerals 86; 90; 94, 98 denoted parts of the folding cutting devices 8, 12 resp. housing 6.
  • Figure 2 shows schematically a view from the front of the device according to figure 1.
  • the direction of rotation is to the right seen in the direction of the longitudinal axis X of the cutter head 4, but the direction of rotation can also be to the left in which case the positioning of the cutters is adapted corresponding to this.
  • the folding cutting devices 8, 10, 12, 14 are articulately arranged on the body 4 by that the body 4 and the folding cutting devices 8, 10, 12, 14 have holes 5; 9, 11, 13, 15 through which bolts 17, 19, 21, 23 are arranged in order to in an articulated way hold the folding cutting devices 8, 10, 12, 14 to the body 4.
  • the bolt head is preferably arranged in the direction of rotation ⁇ of the cutter head 4 in order to unload the locking pins.
  • Figure 3 shows schematically a section of another embodiment of a device 2 for cleaning of pipes according to the invention, where the device is shown in its folded out operating position and where the device for cleaning of pipes comprises a hammer drill device 102 which for example can be implemented by two convex washers 104, 106 which abut against each other, where one washer 104 is arranged to rotate with the cutter head 4 for example by being fixed on the cutter head 4 and where the other washer 106 is arranged to be stationary i.e.
  • a hammer drill device 102 which for example can be implemented by two convex washers 104, 106 which abut against each other, where one washer 104 is arranged to rotate with the cutter head 4 for example by being fixed on the cutter head 4 and where the other washer 106 is arranged to be stationary i.e.
  • FIG 3 is also shown another embodiment of the folding cutting devices 8, 10, 12, 14, where an , seen in the radial r direction, outermost cutter 24, 26, 28, 30 is arranged with its outmost end 108 further back than its innermost end 110 in the folded out position of the respective cutting device 8, 10, 12, 14 seen in the direction of the longitudinal axis X for the cutter head 4.
  • the invention also relates to use of a device 2 for cleaning of pipes 1 at removal of stiffened lining 62 inside pipes 1.
  • a device 2 for cleaning of pipes 1 at removal of stiffened lining 62 inside pipes 1.
  • a device 2 for cleaning of pipes 1 at removal of stiffened lining 62 inside pipes 1.
  • a device 2 for cleaning of pipes 1 at removal of stiffened lining 62 inside pipes 1.
  • a device 2 for cleaning of pipes 1 at removal of stiffened lining 62 inside pipes 1.
  • a device 2 seen in the radial r direction, outermost cutter 24, 26, 28, 30 which is arranged to extend in the radial direction r with a distance which corresponds to the thickness t of the lining 62 in the folded out position of the respective cutting device 8, 10, 12, 14.

Abstract

The invention relates to a device for cleaning of pipes (1) with a substantially circular cross section, where the device (2) comprises a cutter head (4) which when the cutter head (4) in operation rotates about its longitudinal axis (X) fits within the inner diameter (d) of the pipe, where the cutter head (4) further is arranged during rotation of the same to be fed forward inside the pipe (1) in a cleaning direction (R) parallel to the longitudinal direction (L) of the pipe (1) and with the longitudinal axis (X) of the cutter head (4) substantially aligned parallel to and concentrically to the centre axis (C) of the pipe (1), where the cutter head (4) comprises a body (6) and at least three on the body (6) articulately arranged folding cutting devices (8, 10, 12, 14), where the in the cleaning direction (R) arranged end (16, 18, 20, 22) of the respective folding cutting device (8, 10, 12, 14) is arranged under the influence of centrifugal force (Fc) generated by rotation of the cutter head (4) to be folded out in a direction away from the longitudinal axis (X) of the cutter head (4), and where further the respective folding cutting device (8, 10, 12, 14) comprises at least one cutter (24, 26, 28, 30) which in the folded out position of the respective folding cutting device (8, 10, 12, 14) is arranged for milling in the cleaning direction (R). The invention also relates to use of a device (2) for cleaning of pipes (1) when removing stiffened lining (62) inside pipes (1).

Description

Device for cleaning of pipes
Technical field
The present invention relates to a device for cleaning of pipes according to the preamble of claim 1. Background When pipes such as water pipes and sewage pipes etc. age, problems often arise with time, e.g. , deposits may accumulate at the bottom of the pipe, the pipe wall may break due to roots penetrating there through, etc.
One way of taking care of problems of the above kind is to remove the old pipe and to thereafter replace it with a new pipe. This is however usually very costly and time consuming, such as for example when replacing waste pipe systems in housings, and in some cases also very difficult, e.g. if the pipe which needs to be taken care of lies below a later above the pipe erected building.
A more modern alternative to the complete replacement of an old pipe with a new in places where this is difficult and costly is to instead clean out deposits etc. from the old pipe in order to thereafter recondition the old pipe by inserting a new pipe inside the old. In this way, an even and impermeable inner pipe wall is obtained without having to remove the old pipe. Instead of inserting a new pipe in the old, one may after the cleaning out provide the old pipe with a lining, i.e. to build up a new inner wall in the pipe by coating the inner wall of the old pipe with a layer of material, also called
"relining". This can e.g. be done by applying epoxy on the inside of pipes using a rotating brush.
Another possible way to line pipes is to first clean out possible deposits, roots, concrete, etc. from within the old pipe in order to thereafter install a at the insertion flexible casing pipe against the inside of the old pipe, where the casing pipe comprises a material which at first is soft at the insertion and which thereafter stiffens and forms a new stiff and hard pipe lining inside of and abutting against the inner wall of the pipe. The casing pipe may for example be a flexible porous tubular body made of synthetic material soaked with epoxy or other plastic material, e.g. polyester felt impregnated with epoxy, where the epoxy or the other plastic material stiffens after installation inside the pipe, usually cures under pressurization of that inside the pipe installed initially flexible lining.
One way of lining old pipes with flexible casing pipes is to use a flexible casing pipe turned inside out, where its one end is firstly turned right so that this one end with the outer wall of the casing pipe directed outwards may be placed against and be held against the inner wall of the old pipe where
RECORD COPY TRANSLATION
Rule 12.4 after the in such a way against the inner wall of the old pipe placed still mainly in its extension inside out turned casing pipe is fed into the old pipe while at the same time being turned right gradually so that the outside of the casing pipe is gradually placed against the inside of the pipe. In such a way is obtained a lining of the old pipe with a casing pipe which stiffens after the insertion, e.g. in the way which has been mentioned above, and creates a stiff and hard tubular lining on the inside of the old pipe.
In this way, problems in old pipes are taken care of quicker than when the old pipes are completely replaced by new ones.
However, another problem may arise instead when lining old pipes with flexible casing pipes, namely that it sometimes arises, in most cases air filled, gaps between the outside of the casing pipe and the inside of the old pipe. If one discovers this immediately, the possibility exists to remove the casing pipe before it has stiffened, which for example can be done by using a drilling machine like device which twines the still soft and flexible lining to a thin "stick" which can be pulled out from within the old pipe. However, it happens that this does not succeed which leads to that a stiff stick of stiffened lining remains at the center of the old pipe which is very difficult to remove, it also happens that one detects the problem only when the lining has stiffened which leads to that an inward bend of stiffened lining is obtained in the pipe which has to be removed in order to thereafter again line this part of the pipe. To remove a stiffened lining without damaging the inside of the old pipe is both difficult and very time consuming. GB 842,332 shows a tool for radially directed grinding working of inner walls of hollow tubular bodies.
Summary of the invention
The problem that in connection with renovation of pipes to remove obstacles inside the pipe is solved according to the invention by a device for cleaning of pipes according to the characterizing portion of claim 1.
By that the device for cleaning of pipes comprising a cutter head also comprises the features that the cutter head comprises a body and at least three on the body articulately arranged folding cutting devices, where the in the cleaning direction arranged end of the respective folding cutting device is arranged under the influence of centrifugal force generated by rotation of the cutter head to be folded out in a direction away from the longitudinal axis of the cutter head, and where further the respective folding cutting device comprises at least one cutter which in the folded out position of the respective folding cutting device is arranged for milling in the cleaning direction, is obtained the advantage of that one may put a load on the cutter head with a feed force in the forward direction inside the pipe without that the folding cutting devices are folded in even if something in the pipe obstructs the forward movement which makes it possible that with a large feed force and relatively fast feed movement to clean out the pipe both fast and efficient. Further is achieved, by that the respective folding cutting device comprises at least one cutter which in the folded out position of the respective folding cutting device is arranged for milling in the cleaning direction, the advantage that the inside of the pipe itself is not milled whereby a stiffened lining may be removed without damaging the inside of the pipe which is particularly important at pipes with already damaged pipe walls. A further advantage is that the folding cutting devices are folded forwards and in the direction inwards towards the longitudinal axis of the cutter head when the cutter head is pulled out backwards out of the pipe, whereby the risk that the cutter head gets caught inside the pipe is minimized.
Brief description of drawings The invention will be described closer with the aid of the attached drawings, where:
Figure 1 shows schematically a section of a device for cleaning of pipes according to an embodiment of the invention,
Figure 2 shows schematically a view from the front of the device according to figure 1, and
Figure 3 shows schematically a section of another embodiment of a device for cleaning of pipes according to the invention.
Description of preferred embodiments
Similar parts in the different figures are denoted with the same reference numerals.
Figure 1 shows schematically a section of a device 2 for cleaning of pipes according to an embodiment of the invention, where the device is shown in its folded out operating position inside a pipe 1.
The device 2 for cleaning of pipes 1 is intended for pipes 1 with a substantially circular cross section. The device 2 comprises a cutter head 4 which when the cutter head 4 in operation rotates about its longitudinal axis X fits within the inner diameter d of the pipe, where the cutter head 4 further is arranged during rotation of the same to be able to be fed forward inside the pipe in a cleaning direction R parallel to the longitudinal direction L of the pipe and with the longitudinal axis X of the cutter head 4 substantially aligned parallel to and concentrically to the centre axis C of the pipe for milling of obstacles in the pipe 1. The cutter head 4 comprises a body 6 and at least three on the body articulately arranged folding cutting devices 8, 10, 12, 14. In the figures, the invention is illustrated with an embodiment with four folding cutting devices 8, 10, 12, 14, where the folding cutting device "14" is not shown in figure 1 - for those reference numerals below not shown in figure 1, see figure 2. The folding cutting devices 8, 10, 12, 14 are at least three in number, and are preferably arranged symmetrically about the longitudinal axis X of the cutter head 4, in order to decrease the risk for that the cutter head 4 is tilted in the pipe 1 during operation. The end 16, 18, 20, 22 arranged in the cleaning direction R, i.e. the forwards directed end, of the respective folding cutting device 8, 10, 12, 14 is arranged under the influence of centrifugal force Fc generated by rotation of the cutter head 4 to be folded out in a direction away from the longitudinal axis X of the cutter head 4, and where further the respective folding cutting device 8, 10, 12, 14 comprises at least one cutter 24, 26, 28, 30 which in the folded out position of the respective folding cutting device 8, 10, 12, 14 is arranged for milling in the cleaning direction R. Preferably, this cutter 24, 26, 28, 30 is arranged in the first place to mill away obstacles that are situated close to the inner wall 3 of the pipe 1, e.g. stiffened lining which is stuck against the inner wall 3 of the pipe 1.
This embodiment can be developed into a number of other embodiments comprising one or more of the preferred features as is discussed below. The at least one cutter 24, 26, 28, 30 may either be arranged as is shown at 24 and with continuous lines at 28, i.e. substantially perpendicularly in relation to the longitudinal axis X of the cutter head 4 in the folded out position of the respective folding cutting device 8, 10,12,14, or as is shown with broken lines at 28, i.e. at an acute angle to the longitudinal axis X of the cutter head 4, if arranged as at 24, the outermost end of the cutter gets stronger, if arranged as in dashed lines at 28 the outermost end of the cutter is guided even better along the inner wall 3 of the pipe 1. In the following the invention will be described with the embodiment according to what is shown at 24 and with continuous lines at 28.
The folding cutting devices 8, 10, 12, 14 may for example be articulately arranged on the body 4 by that the body 4 and the folding cutting devices 8, 10, 12, 14 have holes 5; 9, 11, 13, 15 (see Figure 2) through which bolts 17, 19, 21, 23 (see also Figure 2) are arranged to articulately hold the folding cutting devices 8, 10, 12, 14 on the body 4. Preferably, the respective folding cutting device 8, 10,12,14 comprises at least two cutters 24, 26, 28, 30; 32, 34, 36, 38 which in the folded out position of the respective folding cutting device 8, 10,12,14 are arranged for milling in the cleaning direction R, where the, seen in the radial direction r, outermost cutter 24, 26, 28, 30 in the folded out position of the respective folding cutting device 8, 10,12,14 is arranged substantially perpendicular in relation to the longitudinal axis X of the cutter head and where a radially r seen inside of this outermost cutter 24, 26, 28, 30 arranged inner cutter 32, 34, 36, 38 in the folded out position of the respective folding cutting device 8, 10,12,14 is arranged at an acute angle a to the longitudinal axis X of the cutter head. Preferably, the, seen in the radial r direction, outermost cutter 24, 26, 28, 30 is arranged to mill away obstacles that are close to the inner surface of the pipe 1, e.g. stiffened lining that is stuck against the inner wall of the pipe 1, and preferably the radially r seen inside of this outermost cutter 24, 26, 28, 30 arranged inner cutter 32, 34, 36, 38 is arranged to mill away obstacles that are situated at a distance from the inner wall 3 of the pipe 1, e.g. to pulverize stiffened lining that the outermost cutter 24, 26, 28, 30 has loosened from the inner wall 3 of the pipe 1. Preferably, at least one further cutting device 40 is arranged on the in the cleaning direction R arranged end 42 of the body 6. Also this cutting device 40 comprises at least one cutter 44, but preferably at least two cutters 44, 46 arranged on each side of the longitudinal axis X of the cutter head. This cutting device 40 mills away those obstacles in the pipe 1 that the other cutting devices 8, 10, 12, 14 do not reach, e.g. to mill away and pulverize a thin stick of stiffened lining at the centre C of the pipe 1.
Preferably those cutters 24, 26, 28, 30, 32, 34, 36, 38, 44, 46 which in different combinations can exist on the cutter head 4 depending on the number of cutters 24, 26, 28, 30, 32, 34, 36, 38, 44, 46 and the number of folding cutting devices 8, 10, 12, 14 are arranged in such a way that they in the folded out position of the folding cutting devices 8, 10, 12, 14 at rotation of the cutter head 4 about its longitudinal axis X together move substantially over the whole cross section surface of the pipe 1 inside the inner wall 3 of the pipe 1.
Preferably the respective folding cutting device 8, 10, 12, 14 is further arranged with a guide surface 48, 50, 52, 54 which in the folded out position of the respective folding cutting device 8, 10, 12, 14 is arranged radially r on the respective folding cutting device 8, 10, 12, 14, there extends in parallel with the longitudinal axis X of the cutter head 4 , and in the rotation direction of the cutter head 4 is there adapted to the curvature of the inner wall 3 of the pipe 1, in order with the guide surfaces 48, 50, 52, 54 to facilitate centering of the cutter head 4 in the pipe 1. The guide surfaces 48, 50, 52, 54 may be coated with friction decreasing material such as for example Teflon ®.
The device preferably comprises a drive member 56 with which the cutter head 4 is arranged to be fed forward inside the pipe 1 in a cleaning direction R and with which the cutter head 4 is arranged to be able to be rotated about its longitudinal axis X, where the drive member 56 further is arranged to be able to take up press force in its axial direction A along the longitudinal direction L of the pipe, whereby a feed force FM can be applied on the cutter head 4 in the longitudinal direction L of the pipe. If the folding cutting devices 8, 10, 12, 14 are folded out already at a rotational speed of about 1000 rotations per minute, the cutter head 4 may in operation be rotated with for example a speed of about 2500-3000 rotations per minute in order to ensure the folding out of these.
The drive member 56 is preferably a wire or a rod. If wire is used, there exists specially twisted wire that manages large press forces without that the wire is bent in its longitudinal direction. The drive member 56 is in turn driven preferably by hydraulics. E.g., a hydraulic pump with variable pressure from 0 up to 180 bars can be used for the drive, which in turn for example can be driven with a combustion engine or an electrical plant.
Preferably, the device 2 further comprises a hose 58 for water V arranged about the drive member 56 with which hose 58 water V can be conveyed to the cutter head 4 for cooling of the same during operation and to decrease the friction forces between the cutter head 4 and the inner wall 3 of the pipe 1 during operation by that a lubricating film of water V positions itself between the radial r ends of the folding cutting devices 8, 10, 12, 14 and the inner wall 3 of the pipe 1. If the drive member 56 has a diameter of e.g. 12 mm, the surrounding hose may e.g. have a diameter of 20 mm.
Preferably, the respective folding cutting device 8, 10, 12, 14 is in its folded out position arranged seen in the direction of the longitudinal axis X of the cutter head 4 to extend in its radial r direction at least in a partial section 60 at an angle separated from the direction of the longitudinal axis X of the cutter head 4 , whereby the folding cutting devices 8, 10, 12, 14 at rotation of the cutter head 4 inside the pipe 1 are arranged to feed possible water V and/or pulverized material from e.g. the lining 62 in the pipe 1 away from the cutter head 4.
The respective cutters 24, 26, 28, 30, 32, 34, 36, 38, 44, 46 preferably comprise sharp cutter edges 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, i.e. with edge angle less than 90°, and/or are coated fully or partly with corresponding protruding bodies of hard material, such as for example cutter teeth made of Coromant ®. If the, seen in the radial r direction, outermost cutters 24, 26, 28, 30 in the folded out positions of the respective cutting devices 8, 10, 12, 14 are arranged substantially perpendicular in relation to the longitudinal axis X of the cutter head 4 and the radially r seen inside of these outermost cutters 24, 26, 28, 30 arranged inner cutters 32, 34, 36, 38 in the folded out position of the respective cutting device are arranged at an acute angle a to the longitudinal axis X of the cutter head 4, it is possible for best results to use positive cutters with larger relief angle at the, seen in the radial r direction, outermost cutters 24, 26, 28, 30 than at the inner cutters 32, 34, 36, 38, as the outermost cutters 24, 26, 28, 30 are loaded by substantially axial X forces whereas the inner cutters are loaded both by axial X and radial r forces. E.g., the relief angles may be of the order of magnitude of 5° resp. 10°. Preferably, one, seen in the radial r direction, outermost cutter 24, 26, 28, 30 is arranged to extend in radial direction r with a distance s corresponding to the thickness t of the lining in the folded out position of the respective cutting device 8, 10, 12, 14 when one uses the device 2 to remove stiffened lining 62 from the inside of a pipe 1. Also other obstacles such as for example roots or solidified concrete etc. may be simultaneously removed from the pipe. In the figure is also shown the outer wall 84 of the pipe, and the outer diameter D of the pipe.
In order for the cutter head 4 when it in operation rotates about its longitudinal axis X to fit within the inner diameter d of the pipe 1, the respective folding cutting device 8, 10, 12, 14 is preferably arranged with a respective stop surface 86, 88, 90, 92 which in the folded out position of the respective folding cutting device 8, 10, 12, 14 is arranged to abut against a respective corresponding stop surface 94, 96, 98, 100 on the body 4 and thereby block further folding out of the respective cutting devices 8, 10, 12, 14. In this way, the maximum diameter of the cutter head in the radial r direction can for example be limited to some or a few mm less than the inner diameter d of the pipe 1. The reference numerals 88; 92; 96 and 100 are not shown in the figures but indicate parts of the folding cutting devices 10, 14 resp. housing 6 which correspond to those with the reference numerals 86; 90; 94, 98 denoted parts of the folding cutting devices 8, 12 resp. housing 6.
Figure 2 shows schematically a view from the front of the device according to figure 1. In the figure are shown the body 4 and thereon articulately arranged folding cutting devices 8, 10, 12, 14, and also the cutters 24, 26, 28, 30, 32, 34, 36, 38, 44, 46 with sharp cutter edges 64, 66, 68, 70, 72, 74, 76, 78, 80, 82 arranged for the in the figure indicated direction of rotation ω for the cutter head 4. I the figure is assumed that the direction of rotation is to the right seen in the direction of the longitudinal axis X of the cutter head 4, but the direction of rotation can also be to the left in which case the positioning of the cutters is adapted corresponding to this. In the figure is shown an embodiment where the folding cutting devices 8, 10, 12, 14 are articulately arranged on the body 4 by that the body 4 and the folding cutting devices 8, 10, 12, 14 have holes 5; 9, 11, 13, 15 through which bolts 17, 19, 21, 23 are arranged in order to in an articulated way hold the folding cutting devices 8, 10, 12, 14 to the body 4. If the bolts are locked with locking pins, the bolt head is preferably arranged in the direction of rotation ω of the cutter head 4 in order to unload the locking pins.
Figure 3 shows schematically a section of another embodiment of a device 2 for cleaning of pipes according to the invention, where the device is shown in its folded out operating position and where the device for cleaning of pipes comprises a hammer drill device 102 which for example can be implemented by two convex washers 104, 106 which abut against each other, where one washer 104 is arranged to rotate with the cutter head 4 for example by being fixed on the cutter head 4 and where the other washer 106 is arranged to be stationary i.e. to not rotate with the cutter head 4 for example by being fixed to the hose 58, and where the washers 104, 106 further are shaped in such a way that when the rotating washer 104 moves in relation to den stationary washer 106 when abutting against each other, a reciprocating motion for the rotating washer 104 is produced which gives rise to a reciprocating motion for the cutter head 4 whereby a hammer drill function is obtained for the cutter head 4.
In figure 3 is also shown another embodiment of the folding cutting devices 8, 10, 12, 14, where an , seen in the radial r direction, outermost cutter 24, 26, 28, 30 is arranged with its outmost end 108 further back than its innermost end 110 in the folded out position of the respective cutting device 8, 10, 12, 14 seen in the direction of the longitudinal axis X for the cutter head 4.
The invention also relates to use of a device 2 for cleaning of pipes 1 at removal of stiffened lining 62 inside pipes 1. Preferably is then used a , seen in the radial r direction, outermost cutter 24, 26, 28, 30 which is arranged to extend in the radial direction r with a distance which corresponds to the thickness t of the lining 62 in the folded out position of the respective cutting device 8, 10, 12, 14.

Claims

Claims
Device for cleaning of pipes (1) with a substantially circular cross section, where the device (2) comprises a cutter head (4) which when the cutter head (4) in operation rotates about its longitudinal axis (X) fits within the inner diameter (d) of the pipe, where the cutter head (4) further is arranged during rotation of the same to be fed forward inside the pipe (1) in a cleaning direction (R) parallel to the longitudinal direction (L) of the pipe (1) and with the longitudinal axis (X) of the cutter head (4) substantially aligned parallel to and concentrically to the centre axis (C) of the pipe (1), characterized in, that the cutter head (4) comprises a body (6) and at least three on the body (6) articulately arranged folding cutting devices (8, 10, 12, 14), where the in the cleaning direction (R) arranged end (16, 18, 20, 22) of the respective folding cutting device (8, 10, 12, 14) is arranged under the influence of centrifugal force (Fc) generated by rotation of the cutter head (4) to be folded out in a direction away from the longitudinal axis (X) of the cutter head (4), and where further the respective folding cutting device (8, 10, 12, 14) comprises at least one cutter (24, 26, 28, 30) which in the folded out position of the respective folding cutting device (8, 10, 12, 14) is arranged for milling in the cleaning direction (R).
Device for cleaning of pipes (1) according to claim 1, characterized in, that the respective folding cutting device (8, 10, 12, 14) comprises at least two cutters (24, 26, 28, 30; 32, 34, 36, 38) which in the folded out position of the respective folding cutting device (8, 10, 12, 14) are arranged for milling in the cleaning direction (R), where the, seen in the radial (r) direction, outermost cutter (24, 26, 28, 30) in the folded out position of the respective folding cutting device (8, 10, 12, 14) is arranged substantially perpendicular in relation to the longitudinal axis (X) of the cutter head (4) and where a radially (r) seen inside of this outermost cutter (24, 26, 28, 30) arranged inner cutter (32, 34, 36, 38) in the folded out position of the respective folding cutting device (8, 10, 12, 14) is arranged at an acute angle (a) to the longitudinal axis (X) of the cutter head (4).
3. Device for cleaning of pipes (1) according to one of the above claims,
characterized in, that a further cutting device (40) is arranged on the in the cleaning direction (R) arranged end (42) of the body (6).
4. Device for cleaning of pipes (1) according to claim 3, characterized in, that the cutters of the cutter head (4) are arranged in such a way that they in the folded out position of the folding cutting devices (8, 10, 12, 14) at rotation of the cutter head (4) about its longitudinal axis (X) together move over substantially the whole cross section area of the pipe (1) inside of the inner wall (3) of the pipe (1).
Device for cleaning of pipes (1) according to any one of the above claims, characterized in, that the respective folding cutting device (8, 10, 12, 14) is arranged with a guide surface (48, 50, 52, 54) which in the folded out position of the respective folding cutting device (8, 10, 12, 14) is arranged radially (r) on the respective folding cutting device (8, 10, 12, 14), there extends in parallel with the longitudinal axis (X) of the cutter head (4), and in the rotation direction (ω) of the cutter head (4) is there adapted to the curvature of the inner wall (3) of the pipe (1), in order to with the guide surfaces (48, 50, 52, 54) facilitate centering of the cutter head (4) in the pipe (1).
Device for cleaning of pipes (1) according to any one of the above claims, characterized in, that the device (2) comprises a drive member (56) with which the cutter head (4) is arranged to be able to be fed forward inside the pipe (1) in a cleaning direction (R) and with which the cutter head (4) is arranged to be able to be rotated about its longitudinal axis (X), where the drive member (56) further is arranged to take up press force in its axial direction (A) along the longitudinal direction (L) of the pipe (1), whereby a feed force (FM) can be applied on the cutter head (4) in the longitudinal direction (L) of the pipe (1).
Device for cleaning of pipes (1) according to claim 6, characterized in, that the drive member (56) is a wire or a rod.
8. Device for cleaning of pipes (1) according to claim 6 or 7, characterized in, that the drive member (56) is driven by hydraulics in turn. Device for cleaning of pipes (1) according to any one of claims 6-8, characterized in, that the device (2) comprises a hose (58) for water (V) arranged about the drive member (56) with which hose (58) water (V) can be conveyed to the cutter head (4) for cooling of the same during operation and to decrease friction forces between the cutter head (4) and the inner wall (3) of the pipe (1) during operation.
Device for cleaning of pipes (1) according to any one of the above claims, characterized in, that the respective folding cutting device (8, 10, 12, 14) in its folded out position is arranged seen in the direction of the longitudinal axis (X) of the cutter head (4) to extend in its radial (r) direction at least in a partial section (60) at an angle separated from the direction of the longitudinal axis (X) of the cutter head (4), whereby the folding cutting devices (8, 10, 12, 14) at rotation of the cutter head (4) inside the pipe (1) are arranged to feed away possible water and/or pulverized material away from the cutter head (4).
Device for cleaning of pipes (1) according to one of the above claims,
characterized in, that the respective cutters (24, 26, 28, 30, 32, 34, 36, 38, 44, 46) comprise sharp cutter edges (64, 66, 68, 70, 72, 74, 76, 78, 80, 82).
Device for cleaning of pipes (1) according to any one of the above claims, characterized in, that the respective folding cutting device (8, 10, 12, 14) is arranged with a respective stop surface (86, 88, 90, 92) which in the folded out position of the respective folding cutting devices (8, 10, 12, 14) is arranged to abut against a respective corresponding stop surface (94, 96, 98, 100) on the body (4) and thereby block further folding out of the respective cutting devices (8, 10, 12, 14), whereby the maximum diameter of the cutter head (4) in radial (r) direction is limited to less than the inner diameter (d) of the pipe (1) in order for the cutter head (4) when it in operation rotates about its longitudinal axis (X) to fit within the inner diameter (d) of the pipe (1).
13. Device for cleaning of pipes (1) according to any one of the above claims, characterized in, that the device (2) for cleaning of pipes (1) comprises a hammer drill device (102).
14. Use of a device (2) according to any one of claims 1-13 when removing stiffened lining (62) inside pipes (1).
15. Use of a device (2) for cleaning of pipes (1) according to claim 14, characterized in,
that a seen in radial (r) direction outermost cutter (24, 26, 28, 30) which is arranged to extend in radial direction (r) with a distance that corresponds to the thickness (t) of the lining (62) in the folded out position of the respective folding cutting device (8, 10, 12, 14) is used.
EP13865432.2A 2012-12-21 2013-12-18 Device for cleaning of pipes Active EP2934774B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1251505A SE537023C2 (en) 2012-12-21 2012-12-21 Device for cleaning pipes
PCT/SE2013/051560 WO2014098754A1 (en) 2012-12-21 2013-12-18 Device for cleaning of pipes

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EP2934774A1 true EP2934774A1 (en) 2015-10-28
EP2934774A4 EP2934774A4 (en) 2016-08-24
EP2934774B1 EP2934774B1 (en) 2020-01-22

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SE (1) SE537023C2 (en)
WO (1) WO2014098754A1 (en)

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CN110440632A (en) * 2019-08-16 2019-11-12 东阳伯格环保科技有限公司 A kind of condenser of power plant descaling rinsing equipment

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CN111305354B (en) * 2020-03-31 2021-04-16 义乌市研创工业设计有限公司 Self-dredging valve for sewage pipeline
CN111496587B (en) * 2020-04-26 2021-06-29 浙江舜特机械设备有限公司 Polishing machine for inner surface of stainless steel storage tank
CN112247813A (en) * 2020-09-29 2021-01-22 连江巧通工业设计有限公司 A material burnishing device that is used for green's categorised garbage bin processing production

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CN110440632B (en) * 2019-08-16 2020-03-24 东阳伯格环保科技有限公司 Power plant condenser scale removal cleaning equipment

Also Published As

Publication number Publication date
SE1251505A1 (en) 2014-06-22
EP2934774A4 (en) 2016-08-24
SE537023C2 (en) 2014-12-09
EP2934774B1 (en) 2020-01-22
WO2014098754A1 (en) 2014-06-26

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