EP2514562A1 - Vorrichtung und Verfahren zum Sandstrahlen einer Leitung - Google Patents

Vorrichtung und Verfahren zum Sandstrahlen einer Leitung Download PDF

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Publication number
EP2514562A1
EP2514562A1 EP12164832A EP12164832A EP2514562A1 EP 2514562 A1 EP2514562 A1 EP 2514562A1 EP 12164832 A EP12164832 A EP 12164832A EP 12164832 A EP12164832 A EP 12164832A EP 2514562 A1 EP2514562 A1 EP 2514562A1
Authority
EP
European Patent Office
Prior art keywords
cleaning element
pipe
actuator
abrasive
nozzle
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.)
Withdrawn
Application number
EP12164832A
Other languages
English (en)
French (fr)
Inventor
Glenn Flueckiger
Frédéric Grand
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.)
Zinguerie Sablage Metallisation SA
Original Assignee
Zinguerie Sablage Metallisation SA
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 Zinguerie Sablage Metallisation SA filed Critical Zinguerie Sablage Metallisation SA
Publication of EP2514562A1 publication Critical patent/EP2514562A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
    • B24C3/04—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other stationary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/003—Removing abrasive powder out of the blasting machine

Definitions

  • the present invention relates to a device and a method for sandblasting a pipe of diameter equal to or greater than 1.3 m.
  • a hydroelectric dam accumulates a large amount of water that forms an artificial lake to produce electricity. By opening valves, in fact, the water rushes into one or more pipes and goes towards the hydraulic power station situated further downstream. When the water begins to descend in the pipe, its potential energy is transformed into kinetic energy. The pressure and / or the speed of the water at the outlet of the pipe causes the rotation of a turbine which in turn drives an alternator transforming the mechanical energy into electrical energy.
  • the pipes for the passage of water are typically a few kilometers long and their diameter may be equal to or greater than 1.3 m.
  • the operation of maintaining these pipes, including the repair of their anticorrosion coating, is carried out in the first phase, thanks to the sanding of the old coating. This work has been done manually for several years. Devices were then introduced to help the operators in their work.
  • These known devices comprise a cleaning element, constituted for example by several arms or a disk, with nozzles for sending an abrasive into the pipe, in particular sand, and an actuator which rotates the cleaning element always in the same direction.
  • the rotation of the cleaning element can be ensured by the jet of sand, without the need for an actuator, but in this case the rotational movement may be non-uniform.
  • One of the major problems with known rotary motion devices is the distance between each nozzle and the pipe wall. Indeed, since the maximum diameter of the cleaning element is about 40 cm, the distance between a nozzle and the walls is about 1 m, so much larger than the ideal distance, effective for cleaning, of 30-10 cm, preferably about 15-10 cm.
  • the abrasive when entering the cleaning element, which is generally metallic, is obliged to turn at an angle greater than 45 ° with respect to the axis of the pipe: because of this abrupt change of direction its speed - and therefore its efficiency - is reduced.
  • This bend also causes turbulence of the sand in the center of the cleaning element, which wears the metal elements of the device.
  • the rotary type movement of the cleaning element does not allow effective cleaning of the pipe. In addition, it does not reproduce the manual movement of operators who, to clean a pipe, do not move their arms always in the same direction.
  • the rotation of the cleaning element requires a lot of energy, which is thus subtracted from the energy intended for sanding. In other words, a sizeable portion of the sanding energy is used to rotate the cleaning element rotatively.
  • An object of the present invention is to provide a device for sandblasting a pipe of diameter equal to or greater than 1.3 m free from the limitations of known sandblasting devices.
  • Another object of the invention is to provide a sanding device that allows effective cleaning of a pipe of diameter equal to or greater than 1.3 m.
  • Another object of the invention is to provide a sanding device that allows a reduction of the pressure loss of the abrasive.
  • Another object of the invention is to provide a sand blasting device which makes it possible to reduce or eliminate abrupt changes in direction of the abrasive.
  • Another object of the invention is to provide a sanding device which allows a reduction of undesirable abrasive losses which can cause a failure of the device.
  • flexible or "rubber” means a flexible pipe, for example and without limitation a pipe made of rubber.
  • the cleaning element comprises at least two arms, each arm comprising a nozzle.
  • each nozzle is attached to the end of the arm close to the walls of the pipe, at a wall distance of less than or equal to 30 cm, preferably at a distance from the walls of less than or equal to 15 cm.
  • the movement of the element is oscillatory, it is possible to use flexible or erasers that bring the abrasive from the center of the cleaning element to the nozzles at the end of each arm, so very close to the walls of the pipe, without the need to use extensions.
  • the pressure losses of the abrasive as well as the section changes because of the threads are removed, which implies a more effective cleaning device of those known.
  • the abrasive remains in the hoses to the end, that is to say to the sanding nozzles, as for manual labor.
  • hoses which would be impossible with a rotary type movement, avoids changes of direction Abrasive abrasives, reducing turbulence and further wear of the same device.
  • the use of hoses has another important advantage, related to the "behavior" of sand in a hose compared to a metal tube: indeed it has been experimentally found that sand "bounces" differently in a hose than in a tube metal and when this rebound in the hose loses less energy. In other words, the energy of sand - and therefore its ability to clean - at the outlet of a hose is greater than that of the same sand at the outlet of a metal tube of the same length and also of shorter length. .
  • the oscillating movement of the cleaning element involves a more efficient cleaning of the pipe because it is carried out in two directions, the opposite of the other: in particular, the cleaning element rotates in a first direction at first. and then in a second direction opposite to the first.
  • the use of the device according to the invention allows sandblasting in a pipe with a speed 3-4 times greater than the speed of a manual sandblasting.
  • the nozzles are also made of a flexible material, for example rubber.
  • a flexible material for example rubber.
  • the nozzles in effect may be separate elements of the hoses, with which they are connected by means known to those skilled in the art. They can also be constituted by the end part of the hoses: in the latter case there are not two distinct elements that are connected, but only one element, in particular the hose, the end part of which has the function of a nozzle.
  • the nozzles are metallic and preferably are coated inside with an abrasion-resistant material, for example titanium or tungsten carbide.
  • an abrasion-resistant material for example titanium or tungsten carbide.
  • this piston or any other equivalent element that allows the nozzles to move is not a metal element traversed by the sand.
  • the device after being advanced in the pipe for a certain distance, is blocked and a hydraulic piston or any other means allows to advance only his head, including the arms, hoses and nozzles.
  • the length of the movement of the head is less than 1 m, preferably less than 50 cm. This variant also allows a sandblasting of the pipe more effective.
  • the device according to the invention furthermore makes it possible to adapt the abrasive flow rate to the diameter of the pipe, because each nozzle is fed separately by a hose, unlike the known devices in which all the nozzles are fed by the same tube. .
  • FIGS. 1A to 1D illustrate different views of an embodiment of the device according to the invention.
  • This device is designed to work in a pipe 100 of diameter d equal to or greater than 1.3 m, for example a pipe of diameter d equal to 1.6 m, 3.1 m or 4 m. Such driving is generally several kilometers long.
  • the pipe 100 is ventilated and has previously been hydrodecaped.
  • the actuator 20 is arranged to oscillate the cleaning element 10, which therefore rotates in a first direction at first and then in a second direction opposite to the first.
  • Each nozzle is connected to a hose or rubber 16.
  • the three hoses 16 exit from a hole 52 located in the center of the cleaning element 10 in correspondence of a tube 50 visible on the figure 2B .
  • the passage of the hoses through the center of the cleaning element 10 is mandatory in the case of a rotary movement of the cleaning element 10. Since according to the invention the cleaning element 10 oscillates, it is also possible to pass the 16 in other places, for example by the sides of the cleaning element 10.
  • the flow of abrasive may be greater than 20 m 3 / min.
  • the cleaning element 10 comprises arms 12 which form a structure of substantially triangular shape and with holes between the arms.
  • the cleaning element 10 has a substantially square, circular, oval, polygonal, and so on. In another variant, it does not have holes, for example it can be a disk without holes.
  • the nozzle port arms can be positioned automatically or manually.
  • Each nozzle 14 sends abrasive into line 100.
  • the abrasive comprises at least one of the following: corundum, blast furnace slag, glass beads, aluminum oxide, iron particles. It is contained in tanks A, B, visible on the Figures 1B to 1D . The number of tanks varies according to need. If, as discussed below, the device also allows to suck the abrasive sent, an additional suction tank, operating in depression, will be provided.
  • One or more tubes 40 connect the tanks A, B to the hoses 16 which are connected to the nozzles 14. Compressed air, brought into the pipe 100 with the aid of one or more galvanized steel tubes not shown, will be mixed with the abrasive using a mixer not shown and sent against the walls of the pipe 100 to perform sanding.
  • the device according to the invention comprises a rolling carriage 30 with wheels 32 for rolling in the pipe 100.
  • FIGS. 2A to 2D illustrate different views of a part of the device according to the invention, comprising an actuator 20, a geared motor 22 and a transmission 60.
  • the actuator 20 is an inductive motor but any other type of motor could be used, for example a compressed air motor (pneumatic) or a hydraulic motor.
  • the device according to the invention comprises a transmission 60 for connecting the actuator 20 to the cleaning element 10.
  • the transmission 60 comprises a toothed belt 66 and two pulleys 62, 64.
  • the reduction of this transmission may be in the range 2-5, for example 3.
  • any other type of transmission 60 may be provided.
  • a geared motor 22 is provided to adapt the speed of the motor to that of the oscillating element 10, for example an asynchronous gear motor.
  • the transmission ratio can be in the range 80-100, for example 95. Considering a reduction ratio of the transmission 60 of 3 and a reduction ratio of the geared motor 22 of 95, the total reduction ratio will be equal to about 300. If the motor 20 is inductive with a rotation of about 1500 revolutions / min, the total ratio implies that the cleaning element 10 is about 5 revolutions / min and that at 1 engine revolution corresponds 1.25 degrees of rotation of the cleaning element 10.
  • the device comprises at least one sensor, for example an inductive type sensor, for limiting the amplitude of the oscillations of the cleaning element 10 and giving the order of reversal of the direction of rotation of the element. 10.
  • One or more position switches or mechanical limit switches can be further provided to limit the amplitude of the oscillations of the cleaning element 10 in case the sensor is out of order.
  • the cleaning element 10 comprises arms 12
  • its oscillation angle is equal to or greater than 360 ° / N, where N is the number of arms 12.
  • the oscillation speed of the cleaning element 10 is constant at first and just before the reversal of the direction. of rotation, the cleaning element 10 is decelerated. After the inversion, the cleaning element 10 is accelerated until reaching the desired constant speed. If the amplitude of each oscillation is ⁇ 120 °, the amplitude of the accelerated / decelerated phases is about ⁇ 15 °. The total oscillation of the element 10 is in this case ⁇ 150 °. The value of the constant speed can be set.
  • the device according to the invention also comprises a control box, which in a preferred embodiment is metallic with tabs or a mounting base, which is dustproof.
  • the cleaning element 10 can be dismantled in order to pass through a hole of small diameter, for example 600 mm.
  • the carriage 30 is also adaptable to different diameters.
  • the carriage 30 can be towed from the rear and, as shown in FIG. figure 6 allows operators 80, for example 2 to 4 operators, to work in a seated position. It is also possible to provide a system that allows the indication of the position of the carriage 30 in the pipe.
  • the device comprises a vacuum cleaner to suck the abrasive used during sandblasting.
  • a vacuum cleaner to suck the abrasive used during sandblasting.
  • an additional suction tank operating in depression, will be provided.
  • the hoses 16 may therefore be part of other hoses not shown in a closed circuit to recover the abrasive. It will thus be possible to suck up approximately 95% of the abrasive sprayed during the sanding operation.
  • the device according to the invention is also arranged to paint the pipe 100: in this case the nozzles 14 will have to be changed.
  • FIGS. 3 to 5 illustrate a front view of different embodiments of the device according to the invention in pipes of different diameters, in particular 3.1 m, 1.3 m and 1.6 m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
EP12164832A 2011-04-21 2012-04-19 Vorrichtung und Verfahren zum Sandstrahlen einer Leitung Withdrawn EP2514562A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH7092011 2011-04-21

Publications (1)

Publication Number Publication Date
EP2514562A1 true EP2514562A1 (de) 2012-10-24

Family

ID=45999692

Family Applications (1)

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EP12164832A Withdrawn EP2514562A1 (de) 2011-04-21 2012-04-19 Vorrichtung und Verfahren zum Sandstrahlen einer Leitung

Country Status (1)

Country Link
EP (1) EP2514562A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015010688A1 (de) * 2013-07-25 2015-01-29 Wheelabrator Group Gmbh Druckluftstrahlvorrichtung für das innenstrahlen von rohrabschnitten und turmsegmenten
CN105215862A (zh) * 2015-10-16 2016-01-06 宝汇建设工程有限公司 钢管内外表面喷砂装置
CN105234831A (zh) * 2015-10-16 2016-01-13 宝汇建设工程有限公司 钢管内孔抛丸装置
CN113043172A (zh) * 2021-04-22 2021-06-29 济南东和机械设备有限公司 一种能够自动更换磨料以及磨料循环使用的喷砂装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH642294A5 (en) * 1980-01-10 1984-04-13 Marco Darani Process and apparatus for the anti-corrosion treatment of the inner surface of a tubular hollow body
DE3836277A1 (de) * 1988-10-25 1990-05-10 Schlick Heinrich Gmbh Co Kg Manipulatorarm
DE4017998A1 (de) * 1990-06-05 1992-01-09 Siemens Ag Verfahren und vorrichtung zur dekontamination radioaktiv kontaminierter oberflaechen
FR2692022A1 (fr) * 1992-06-04 1993-12-10 Alves Manuel Dispositif à rotation semi-alternée à 190degré pour décaper l'intérieur des conduites cylindriques.
DE19621869A1 (de) * 1996-05-31 1997-12-04 Nagel Masch Werkzeug Verfahren und Vorrichtung zum Strahlen von Werkstückoberflächen mit einer Druckflüssigkeit
DE202007007528U1 (de) * 2007-05-26 2007-07-26 Hermes Technologie Gmbh & Co. Kg Vorrichtung zur Reinigung der Wandung von Kanalschächten

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH642294A5 (en) * 1980-01-10 1984-04-13 Marco Darani Process and apparatus for the anti-corrosion treatment of the inner surface of a tubular hollow body
DE3836277A1 (de) * 1988-10-25 1990-05-10 Schlick Heinrich Gmbh Co Kg Manipulatorarm
DE4017998A1 (de) * 1990-06-05 1992-01-09 Siemens Ag Verfahren und vorrichtung zur dekontamination radioaktiv kontaminierter oberflaechen
FR2692022A1 (fr) * 1992-06-04 1993-12-10 Alves Manuel Dispositif à rotation semi-alternée à 190degré pour décaper l'intérieur des conduites cylindriques.
DE19621869A1 (de) * 1996-05-31 1997-12-04 Nagel Masch Werkzeug Verfahren und Vorrichtung zum Strahlen von Werkstückoberflächen mit einer Druckflüssigkeit
DE202007007528U1 (de) * 2007-05-26 2007-07-26 Hermes Technologie Gmbh & Co. Kg Vorrichtung zur Reinigung der Wandung von Kanalschächten

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015010688A1 (de) * 2013-07-25 2015-01-29 Wheelabrator Group Gmbh Druckluftstrahlvorrichtung für das innenstrahlen von rohrabschnitten und turmsegmenten
CN105215862A (zh) * 2015-10-16 2016-01-06 宝汇建设工程有限公司 钢管内外表面喷砂装置
CN105234831A (zh) * 2015-10-16 2016-01-13 宝汇建设工程有限公司 钢管内孔抛丸装置
CN113043172A (zh) * 2021-04-22 2021-06-29 济南东和机械设备有限公司 一种能够自动更换磨料以及磨料循环使用的喷砂装置

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