JP2015505586A - Rocking machine flushing liquid sealing device, method of manufacturing the same, flushing housing, and rock drill - Google Patents

Abstract

Including a ring-shaped elastic sealing device comprising means for contacting the seating surface arranged in the flushing housing on the one hand and means for sealing contact with the movable part surface (2) in the flushing housing on the other hand Devices (5, 6) for sealing the flushing liquid of a rock drill. The device (5, 6) for sealing the flushing liquid comprises an anode device (11, 12) having at least one sacrificial anode unit brought into contact with the flushing liquid, the anode device being electrically connected to the flushing housing. Means (16, 16 ′, 16 ″, 16 ″ ′) for realizing contact are provided. The invention also relates to a method and a flushing housing and a rock drill. [Selection] Figure 1

Description

  The present invention relates to a flushing liquid sealing device for a rock drill. The invention also relates to a method for manufacturing the device, a flushing housing and a rock drill.

  Rock drills having an impact rotating drill string with a flushing liquid for removing cutting waste formed during excavation are known in the art. Such excavators are equipped with a built-in flushing liquid swivel in the excavator, for example in the area of the drill string guide device. In such a fluid liquid swivel, two or more radial holes are provided in the shaft adapter of the excavator to supply incoming flushing liquid to the axial flushing holes of the drill string. Then, the flushing liquid is discharged to the drill bit. A conventionally known swivel device includes a liquid sealing member fixed inside a housing of an excavator on both sides of the radial hole opening or the plurality of radial hole openings.

  The water obtained locally at the drilling site is often used as a flushing liquid, which is essentially separated from the solid particles and is even lower through the flushing holes in the drill string. Pumped up by an excavator for transportation Such water is often very erosive because it can contain high salinity that poses a risk of corrosion in exposed portions of a rock drill. Therefore, corrosion damage appears on the sealing surface of the shaft adapter with which the sealing device contacts. This shortens the operating life of the sealing device. In particular, the surface portion of the shaft adapter that is affected by corrosion will quickly wear the sealing surface of the sealing device due to the roughness of the surface. In particular, since the corrosion corrodes the shaft adapter when resuming after the machine downtime, the sealing device is easily damaged.

  A further problem is the risk of serious damage to the shaft adapter and in particular to the radial flushing hole area, as corrosion damage can cause damage due to fatigue. The occurrence of such breakage can cause serious damage to the excavator and excavator downtime.

  As an example of the prior art, Patent Document 1: WO03 / 077888 discloses a method for protecting corrosive parts of a rock drilling device from corrosion, and the shaft adapter is made of a special protective compound. It is covered.

WO03 / 077888

  It is an object of the present invention to provide an apparatus and method that at least alleviates the problems of the prior art.

  This object is achieved by a fluid liquid sealing device comprising an anode device having at least one sacrificial anode unit brought into contact with a flushing liquid.

  By providing the fluid liquid sealing device itself with the anode device functioning as a sacrificial anode, several important advantages are obtained. An important feature of the present invention is that it guarantees the possibility of replacing the anode material in an efficient and simple manner at the same time as any scheduled excavator sealing device replacement. With respect to the main benefits.

  Conventional sealing devices are typically replaced at short intervals of about 24 hours to about 100 hours. However, according to the present invention, the operating life and service interval of the sealing device can be expected to be longer. It provides a better economic effect for a rock drill using the invention.

  Thus, the device according to the invention provides corrosion protection via the anode device arranged in connection with the sealing device, so that it is not necessary to provide an extended service standard, for example to replace further parts of the excavator. In addition, the anode device ensures that there is a calculated sufficient amount of anode material and that it is exposed to a sufficient amount of flushing liquid while at the same time being near the area to be protected against corrosion. In an advantageous manner. According to the invention, there is no restriction or influence of the flushing liquid flow. Otherwise, the conditions for effective flushing can be exacerbated.

  Preferably, the anode device comprises means for achieving electrical contact with the excavator housing. Such means can be a sheet metal part or conductive part in a metal cable or similar form connected to contact the surface of the excavator housing. However, the means for achieving electrical contact can alternatively be simply pushed between the sealing device and the excavator housing. It is not excluded to provide a means for directly contacting the sealing surface of the shaft adapter.

  The possibility of obtaining such direct contact with the shaft adapter is arranged for moving parts / shaft adapters with carbon conductors, or for metals, avoiding metal contacts and An inner portion of the surface of the flush fluid seal is provided that communicates to establish a mechanical contact.

  Instead of including means for establishing contact with the machine housing and / or moving parts, for example in the form of a shaft adapter, a suitable potential is applied between the anode device and any suitable part of the rock drill. An electric circuit to be applied can be arranged.

  For stable housing of the device, the anode device can be pushed into the recess, for example, by forming a sealing device with one or more recesses. Such a recess can take the form of an annular groove, for example. The anode device can have, for example, a corresponding ring-shaped structure with sacrificial anode units distributed on its circumference.

  Prior to placing the fluid-liquid sealing device in the excavator housing, the anode device can be positioned within the sealing device. Alternatively, the anode device can be positioned on the sealing device after the fluid liquid sealing device is positioned on its seat in the excavator housing. In this case, in principle, the entire device can be more easily positioned on its seating surface in the excavator housing because of the greater flexibility with which each part can be obtained alone compared to the flexibility of the composite device. It allows the appropriate deformations that may be required to actually allow positioning. The fluid-liquid sealing device can be made stronger when the anode device is inserted, and it is not easy to handle each as a component itself.

  Furthermore, the device according to the invention can be configured such that at least a part of the sealing device surrounds the anode device. This can be achieved, for example, by an anode device that is at least partially embedded in the sealing device from the start.

  In a special embodiment of the invention, the fluid-liquid sealing device is integrated with a guide device for guiding the shaft adapter. This can be formed in one piece with the sealing device, in particular when the guiding device is a plastic bushing.

  The anode device preferably comprises a plurality of sacrificial anode units that are electrically and / or mechanically interconnected to obtain a safety function. In the modification, the anode device includes, for example, a string having flexibility in the form of a thread formed in a ring shape and spirally wound, and is composed of a sacrificial anode material.

  The amount of the material can be constituted by the consumed amount or the bulk of the sacrificial anode unit, which is expected in the life span of the sealing device, and excess and deficiency can be avoided.

  The invention also comprises a ring-shaped elastic sealing device comprising on the one hand means for contacting the seating surface arranged on the flushing housing and on the other hand means for sealing the contact with the surface of the movable part of the flushing housing. The ring-shaped elastic sealing device comprises an anode device having at least one sacrificial anode unit for contacting the flushing liquid, the anode device comprising means for establishing electrical contact with the flushing housing The invention also relates to a method for manufacturing a device according to the invention.

  In particular, the anode device is firmly received in at least one recess of the sealing device. Thus, the sealing device is typically biased to at least partially surround the anode device.

  The invention also relates to a rock drill flushing fluid housing comprising at least one device as described above and a rock drill comprising at least one such device.

  In a special embodiment, the electrical circuit is arranged to apply an appropriate potential between the sacrificial anode unit and the machine housing.

  Further advantages and features of the present invention are explained in the detailed description of the embodiments below.

  Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is an axial sectional view of a detail of a rock drill equipped with a flushing liquid sealing device according to the present invention. The perspective view which shows the flushing housing of FIG. The perspective view which shows the apparatus for sealing flushing liquid. Sectional drawing of the apparatus for sealing flushing liquid. Sectional drawing which shows one form of the apparatus for sealing the flushing liquid by this invention. Sectional drawing which shows the different form of the apparatus for sealing the flushing liquid by this invention. Sectional drawing which shows the different form of the apparatus for sealing the flushing liquid by this invention. 3 is a flowchart showing a procedure of a method according to the present invention.

  In FIG. 1, the front part of the rock drill 1 is shown by an axial sectional view. The shaft adapter 2 including the first upper member of the drill string is supported on the excavator 1 in a manner known per se. Basically, a flushing housing 3 having a flushing liquid swivel inside includes a flushing chamber 4 and a first device 5 and a second device 6 for sealing the flushing liquid, respectively. Devices 5 and 6 for sealing the flushing liquid seal the flushing chamber 4 against the drill guide bushing 10 and against the rotary impact mechanism belonging to the rock drill. These parts are well known in the art and will not be described in detail.

  Reference numeral 7 indicates a flushing liquid inlet from a pump (not shown) to the flushing chamber 4. Each of the devices 5 and 6 for sealing the flushing liquid is provided with an elastic sealing device and provided with anode devices 11 and 12, respectively. Each of the anode devices includes a sacrificial anode material to provide screen protection against corrosion on the other exposed portions of the rock drill. The devices 5 and 6 for sealing the flushing liquid are positioned on the respective seating surface 22 in the excavator, and in the form of respective sealing lips, by means for sealing the contact, on the surface of the shaft adapter 2. Seal against each other. The shaft adapter 2 has a movable part inside the excavator housing, which moves with respect to each of the devices for sealing the flushing liquid via rotational movement and limited impact action and other axial movements. Is possible.

  The shaft adapter 2 includes an axial flushing channel 8 and at least one radial flushing hole 9 that are in contact with a drill bit (not shown), and the flushing liquid existing in the flushing chamber 4 is passed through the flushing hole 9. Move to the front of the axial flushing channel 8.

  FIG. 2 shows the flushing housing 3 as a separate unit comprising a flushing chamber 4 and a flushing liquid inlet 7 respectively for the devices 5 and 6 for sealing the flushing liquid.

  FIG. 3 shows in detail a perspective view of the device 5 for sealing the flushing liquid. The elastic sealing device comprises a recess 13 in the form of an annular groove, the annular groove being configured to receive an anode device 11 comprising a plurality of sacrificial anode units 14 distributed in the peripheral direction, and also having a conductive ring-like shape. They are connected to each other through threads, wires, bands, threads formed in a spiral shape, and the like. The device 5 comprises an outer envelope surface 18 for contacting the interior of the seating surface in the flushing housing, a side surface 21 facing the flushing chamber, and a rear flat surface 19 preferably facing one direction from the flushing chamber. It has.

  At least one of the sacrificial anode units 14 includes means for establishing electrical contact with the excavator housing in the form of a sheet metal portion or similar portion 16 positioned on the outer envelope surface 18, and each sacrificial anode. An electric conductor 15 between the unit 14 and the sheet metal part 16 is provided. When the apparatus for sealing the flushing liquid is mounted on the seating surface, electrical contact with the excavator housing is established by the sheet metal part that comes into contact with the inside of the seating surface.

  The means for establishing the electrical contact is configured as shown in FIG. 3 and is arranged in each of the plurality of sacrificial anode units 14 distributed in the annular groove 13. The means for establishing the electrical contact can be arranged to allow contact with the machine housing following the positioning of the anode device in the already positioned sealing device.

  In FIG. 3 a, the device 5 is shown in cross-section, showing an envelope surface 18, a side surface 21 facing the flushing chamber, a side surface 19 facing the flushing chamber, and a sealing lip 20. A sacrificial anode unit 14 and an electrically conductive wire 17 are shown inside the recess 13. In fact, the recess 13 is designed to permanently hold the anode device 11 with a groove comprising the recess 13 in the outermost deflated, raised or raised or similar shape, for example. Prevents falling off.

  FIG. 4 shows an alternative embodiment, in which an anode device 11 ′ corresponding to the anode device 11 of FIG. 3 is partially fitted into the synthetic material via a molding to form a very flexible elastic sealing device. ing. Contact with the excavator housing can be achieved by an external sheet metal part 16 'arranged on the outermost side of the envelope surface 18'. Furthermore, it is also possible to provide a conductor inside the plastic material present, for example in the region of the sealing lip 20 ', for contact with the shaft adapter during operation.

  FIG. 5 shows another apparatus 5 ″ for sealing the flushing liquid. An electrically conductive anode material or alternatively a bundled anode material with a sacrificial anode is used for the elastic sealing device. It is provided inside the material and constitutes a matrix such as a conductive macrostructure, which can be said to provide a sacrificial anode unit that includes the sacrificial anode material and is integrated. On the one hand at the envelope surface 18 "of the device in contact with the machine housing and on the other hand in contact with the surface material in the region in contact with the flushing liquid in the flushing chamber.

  The invention can be modified within the scope of the appended claims, and the apparatus can be varied in various ways with respect to structure and shape.

  The dimensions and amount of the anode device can be adapted to characteristics such as flushing water as well as operating time. All sacrificial anode units should not touch each other, but preferably some of the units at least touch each other to achieve a safer operation.

  A common material for the sacrificial anode unit is zinc, while retaining wires, spirally wound threads, bands, etc. can be made from iron or steel. The anode device can be embedded in, incorporated into, or snapped into a groove adapted for that purpose, as described above. However, a common condition is that contact exists between the anode material and the flushing liquid. The material of the sealing device may be of a conventional type depending on the sealing application. Examples include polyurethane, nitrilobutadiene rubber, fluoroelastomer, ethylene propylene diene terpolymer rubber, silicon rubber, polytetrafluoroethylene, and polyoxymethylene.

  In an alternative embodiment, if the excavator 1 comprises a synthetic material drilling guide, the drilling guide and the first seal can be constructed together. This is shown in FIG. 6, where the device 5 "'for sealing the flushing liquid is integrated with the drill bushing 10"' so that the drilling guide and the first seal form an integral unit. Built into the piece. Furthermore, the device 5 "'can be configured according to what is described in connection with the above figures.

  In order to improve the anticorrosion function of the device according to the invention, an electrical circuit can be arranged in connection with the excavator. Such an electrical circuit provides an appropriate (positive) potential to an anode device having at least one sacrificial anode unit in relation to adjacent portions of the rock drill. In this case, the anode device has no means for direct electrical contact with the metal part of the rock drill, but is electrically isolated therefrom. Such an electrical circuit is illustrated by reference numeral 26 in FIG. The conduit between the anode device and the electrical circuit is for example drawn through a channel specially formed in the excavator housing and is therefore not shown in FIG.

The procedure of the method according to the invention is shown by way of example only with reference to FIG.
Position 20 indicates the start of the procedure.
The position 21 indicates that a ring-shaped elastic sealing device is provided.
Position 22 indicates that the ring-shaped elastic sealing device is replenished with an anode device having at least one sacrificial anode unit for contacting the flushing liquid.
Position 23 indicates that the anode device is provided with means for establishing electrical contact with the excavator housing.
Position 24 indicates that the anode device can be securely received in at least one of the recesses in the sealing device.
Position 25 indicates the end of the procedure.

  The configuration for sealing the flushing liquid is implemented within the scope of the present invention even in the form of sealing the configuration in a flushing housing separated from the rock drill and positioned, for example, adjacent to the excavator housing. Is possible.

  The movable part in the rock drill housing that co-operates with the device for sealing the flushing liquid may be a component other than the shaft adapter, for example other parts of the drill string.

DESCRIPTION OF SYMBOLS 1 Rock drill 2 Movable part 3 Flushing housing 4 Flushing chamber 5; 6 Apparatus for sealing flushing liquid 7 Flushing liquid inlet 9 Flushing 10 Drill bushing 11; 12 Anode apparatus 13 Recessed part: Annular groove 14 Sacrificial anode unit 15 Electricity Conductor 16 Means for Achieving Electrical Contact; Sheet Metal Part 18 Envelope Surface 19 Surface 20 Sealing Lip 21 Side 22 Seating Surface 26 Electrical Circuit

Claims (18)

A ring-shaped elastic sealing device comprising means for bringing into contact with a seating surface arranged in the flushing housing on the one hand and means for sealing contact with the surface of the movable part (2) in the flushing housing on the other hand In a device (5, 6) for sealing the flushing liquid of a rock drill including
A device characterized in that the device (5, 6) for sealing the flushing liquid comprises an anode device (11, 12) having at least one sacrificial anode unit brought into contact with the flushing liquid.   2. A device according to claim 1, characterized in that the anode device comprises means (16, 16 ', 16 ", 16"') for realizing electrical contact with the flushing housing.   3. Device according to claim 1 or 2, characterized in that the sealing device is provided with at least one recess (13) for securely receiving the anode device (11, 12).   3. A device according to claim 1 or 2, characterized in that the sealing device is formed at least partially surrounding the anode device (11, 12).   5. The device according to claim 1, wherein the device is integrated with a guide device (10 ″ ′) for guiding the shaft adapter (2).   6. The device according to claim 1, wherein the anode device (11, 12) comprises a plurality of sacrificial anode units which are electrically and / or mechanically interconnected. .   7. A device according to any one of the preceding claims, wherein the anode device comprises a string arranged flexibly or comprises a string arranged flexibly.   8. A device according to any one of the preceding claims, characterized in that the single or multiple sacrificial anode units are sized according to the expected consumption over the operating life of the sealing device. Using a ring-shaped elastic sealing device that includes means for contacting the seating surface disposed in the flushing housing on the one hand and means for sealing the contact with the movable part surface in the flushing housing on the other hand A method of manufacturing an apparatus for sealing flushing liquid,
Sealing the flushing liquid according to any one of the preceding claims, characterized in that the ring-shaped elastic sealing device comprises an anode device having at least one sacrificial anode unit adapted to come into contact with the flushing liquid. A method of manufacturing a device for performing the above.   The method of claim 9, wherein the anode device comprises means for providing electrical contact with the flushing housing.   11. A method according to claim 9 or 10, characterized in that the anode device is firmly received by at least one recess of the sealing device.   11. A method according to claim 9 or 10, characterized in that the sealing device is formed so as to at least partly surround the anode device (11, 12).   13. The method according to any one of claims 9 to 12, wherein the sealing device comprises a plurality of sacrificial anode units that are electrically and / or mechanically interconnected.   14. A method according to any one of claims 9 to 13, characterized in that the sealing device comprises an anode device composed of or comprising a string arranged flexibly.   15. A method according to any one of claims 9 to 14, wherein the sealing device comprises an anode device having a sacrificial anode volume dimensioned by the expected consumption over the operating life of the sealing device.   A flushing housing for a rock drill including at least one device according to claim 1.   A rock drill including at least one device according to any one of claims 1-8.   The rock drill according to claim 17, wherein an electric circuit is provided in an adjacent portion of the flushing housing for applying a positive potential to the anode device.

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