SUBSEA PROCESSING MACHINE COMPRISING A TOOL HOLDER WITH A CHANGE HUB FOR RECEIVING ROTARY TOOLS

Abstract

In order to mill, drill, saw or the like in the offshore sector, subsea processing machines are used which comprise a tool holder with a change hub for receiving at least one rotary tool, such as for instance a milling cutter, saw, drill or the like. The tool holder preferably has a carrier body for receiving the tool hub, wherein the latter comprises a hub flange for receiving tools. The preferably centric hub ring of the change hub can be arranged on the carrier body of the tool holder and can be connected to the tool holder in such a manner as to be able to be detached and clamped by means of at least one locking apparatus.

Claims

1. A subsea processing machine comprising: a tool holder and a change hub for receiving at least one rotary tool, wherein the tool holder has a cylindrical carrier body for receiving the change hub, the change hub includes a hub flange and a hub ring, wherein the hub flange is configured for receiving the tool holder, wherein the hub ring protrudes centrically from the hub flange, and wherein the centric hub ring is arranged on the carrier body so as to be able to be detached and arrested by at least one locking apparatus, characterized in that the at least one locking apparatus includes an unlocking piston and a blocking bolt, the unlocking piston is received in a chamber in the tool holder, the chamber configured to be pressurized, the blocking bolt oriented with the unlocking piston and received in the hub ring, the blocking bolt can be pretensioned at one end distal from the tool holder by a spring element, a locking bolt is disposed at a second end of the blocking bolt proximal the tool holder, which in a locking position engages into a locking formation on the carrier body and cooperates with a thus formed cam at the face-side end of the hub ring, wherein when the unlocking piston is moved outwards as a result of pressurization in the hub direction the unlocking piston urges the blocking bolt into the hub ring and the locking bolt is disengaged by the hub from the locking formation such that the change hub can be detached from the tool holder.

2. The subsea processing machine as claimed in claim 1, characterized in that a displacement ring is seated on the hub ring and carries a detention bolt which engages through a guide opening in the hub ring, the detention bolt is connected to the blocking bolt for conjoint displacement such that by displacing the displacement ring in the direction of the hub flange, the blocking bolt is urged into the hub ring with pretensioning of the spring element such that the locking bolt seated on the cam is moved into an unlocking position.

3. The subsea processing machine as claimed in claim 1, characterized in that the unlocking piston has, on its side remote from the chamber, a spring element pretensioned by the unlocking piston which can be moved outwards as a result of pressurization.

4. The subsea processing machine as claimed in claim 1, characterized in that the blocking bolt is received in a translational manner in a bore of the hub ring, the bore being parallel with an axis of the hub ring.

5. The subsea processing machine as claimed in claim 1, characterized in that the locking bolt is received in a radial bore of the hub ring and has, on its end directed to the blocking bolt, a latch lug formed by an oblique surface which faces towards the hub flange and from above radially downwards.

6. The subsea processing machine as claimed in claim 5, characterized in that the locking formation in the blocking bolt is a recess, complementary to the latch lug, which is formed with an identically directed oblique surface at a bottom of the recess.

7. The subsea processing machine as claimed in claim 1, characterized in that a plurality of locking apparatuses are arranged at a uniform angular spaced interval provided over a periphery of the carrier body and change hub.

8. The subsea processing machine as claimed in claim 1, characterized in that the carrier body and the hub ring are formed in a cylindrical manner about an axial axis of the processing machine.

9. The subsea processing machine as claimed in claim 1, characterized in that the cam is a web-like flange which extends in an oblique manner in cross-section and extends from radially inwards to radially outwards from an interior of the hub ring to an exterior of the hub ring.

10. The subsea processing machine as claimed in claim 9, characterized in that the locking bolt is provided with a recess, with which said locking bolt is seated on the flange in a displaceable manner.

11. The subsea processing machine as claimed in claim 2, characterized in that the displacement ring is formed coaxially with the axis of the change hub.

12. The subsea processing machine as claimed in claim 1, wherein the rotary tool is a milling cutter.

13. The subsea processing machine as claimed in claim 1, wherein the rotary tool is a saw.

14. The subsea processing machine as claimed in claim 1, wherein the rotary tool is a drill.

15. The subsea processing machine as claimed in claim 10, wherein the locking bolt is configured in the manner of a rider.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is a schematic, partial view of a subsea processing machine comprising a tool holder and a change hub arranged thereon in the locking position; and

[0017] FIG. 2 is a schematic view according to FIG. 1, with an unlocked and removed change hub.

DESCRIPTION OF THE EMBODIMENT(S)

[0018] FIG. 1 shows a subsea processing machine for offshore processing by means of milling cutters, drills, saws or the like, comprising a tool holder 2 and a carrier body 4 which is received therein in a central bore and of which the axis coincides coaxially with the central axis of rotation of the processing machine. A change hub designated by the reference numeral 6 is received on the cylindrical carrier body 4 in the locking position as shown in FIG. 1 and is formed having a hub flange 8 and a centric rotationally cylindrical hub ring 10. As shown in FIG. 1, the hub ring 10 is received on a cylindrical sleeve portion 12 of the carrier body 4, said sleeve portion protruding from the tool holder 2. In order to lock the change hub 6 to the tool holder 2, at least one locking apparatus is provided which is described hereinafter, wherein in an expedient manner a plurality of locking devices, which are arranged at the same angular spaced interval over the periphery of the tool holder or the carrier body and the change hub 6, can be provided, in particular three, four, six or eight locking devices depending upon the size, performance capacity and construction type of the processing machine. In this respect, only one locking apparatus is described in greater detail hereinafter and also illustrated in FIGS. 1 and 2 accordingly.

[0019] The locking apparatus has a piston cylinder device which is designated generally by the reference numeral 14 and of which the piston is designated by the reference numeral 16. Formed at the end of the piston 16 remote from the hub is a cylinder chamber 18, to which pressure can be applied externally in a hydraulic or pneumatic manner.

[0020] A blocking bolt 20 is provided on sides of the change hub 6 in a manner oriented with the piston axis, said blocking bolt being received in a translationally displaceable manner in a bore 22 of the hub ring 10. Both the piston axis and the axis of the blocking bolt 20 oriented with the piston axis in the locking position shown in FIG. 1 are in parallel with the axis of rotation or axial axis of the processing machine or the carrier body 4. The piston 16 and the likewise translationally displaceable blocking bolt 20 can each be pretensioned by means of a spring element, wherein a spring element 24 is received in a recess 26 of the blocking bolt 20 and is attached to a screw bolt which is screwed into the hub flange 8 and is designated by the reference numeral 28. The consequence of this is that when the blocking bolt 20 shown in FIG. 1 is moved to the right, the spring element 24 is pretensioned accordingly and builds up a restoring force which is directed in the direction of the blocking bolt 20 to the left to the tool holder 2.

[0021] A spring element 30 is arranged on the piston 16 and in particular at the end of the piston 16 which is directed towards the hub 6. In this case, it is also applicable that when the piston 16 is disengaged to the right, the spring 30 becomes pretensioned and thus builds up a restoring force on the piston 16 which acts in the direction of the piston to the left.

[0022] In the illustrated exemplified embodiment, the blocking bolt 20 has, at its end facing the tool holder 2, a cam 32 which projects from the face-side end of the blocking bolt 20 in the direction of the tool holder 2, i.e. directed away from the hub. The cam 32 illustrated in section forms in this respect an obliquely extending web 32 or an obliquely extending flange which extends radially from the inside upwards from the face-side end of the bolt 20 in the direction of the tool holder 2. Seated on this cam 32, as a rider so to speak, is a locking bolt 34 which is provided which a recess complementary to the flange 32 and can be displaced longitudinally of the cam 32. The locking bolt 34 engages through the hub ring 10 and engages with its lower end as shown in FIG. 1 into a latch formation 38, formed as a latch recess, in the carrier body 4, more specifically in the cylindrical sleeve portion 12, thus establishing the locking position for the change hub 6. In the illustrated exemplified embodiment, the locking bolt 34 has, at its lower end, i.e. the end directed towards the carrier body, a latch lug which is designated by the reference numeral 36, is formed in this case by means of an oblique surface and of which the inclination extends from left to right and thus radially downwards in the illustrated exemplified embodiment shown in FIG. 1. The latch lug 36 engages into a complementary latch formation in the form of a latch recess 38 which has a blocking shoulder 40.

[0023] Seated on the hub ring 10 is a displacement ring 42 which is guided axially on the outer peripheral surface of the hub ring 10, is fixedly connected to the blocking bolt 20 by means of a detention bolt 44 engaging through the hub ring 10 and in this case according to the illustrated exemplified embodiment engages into a screw bore of the blocking bolt 20 and is fixedly connected to the bolt 20 by means of a screw connection. In this case, the detention bolt 44 engages into a guide opening 46, which extends in the longitudinal direction and is formed in particular as a long hole, in the hub ring 10, or engages through this opening 46 such that when the displacement ring 42 is moved to the right, the blocking bolt 20 is likewise moved to the right with the build-up of pretensioning on the spring element 24, and in particular in the direction of the hub flange 8. If the blocking bolt 20 is moved to the right, then the locking bolt 34 moves upwards on the hub, which is moved to the right at the same time as the piston, and in particular radially upwards as a result of the forced guidance of the locking bolt 34 in a bore 48 of the hub ring 10, which effects unlocking of the hub.

[0024] In order to remove the change hub 6, which is locked to the carrier body 4, in the event of damage to a rotary tool, for instance a saw, from the tool holder 2 subsea, the cylinder chamber 18 of the tool holder 2 is pressurised either hydraulically or pneumatically such that the piston 16 is moved to the right out of the tool holder 2 and in this case by reason of the contact with the cam 32 moves the blocking bolt 20 to the right against the spring element 24 which is designed preferably as a compression spring and is pretensioned. As a result, the locking bolt 34 which is seated as a rider on the web 32 is compelled to move upwards and moves out of the locking position into the unlocking position in which the locking bolt 34 is disengaged upwards from the locking position illustrated in FIG. 1 with engagement of the latch lug 36 into the latch recess 38. In this position, i.e. the unlocking position, the change hub 6 can be removed towards the right in order to pull the processing machine upwards and change the processing tool.

[0025] For mounting purposes, as shown in the view of FIG. 2 the displacement ring 42 is urged manually or in a motor-driven manner to the right in the direction of the hub flange 8, wherein by means of the detention bolt 44 the blocking bolt 20 is also moved simultaneously to the right, and in particular with spring pretensioning of the spring element 24 which in this case is designed in an expedient manner as a compression spring. As the blocking bolt 22 moves to the right in the direction of the hub flange 8 by reason of the corresponding displacement of the displacement ring 42, the locking bolt 34 is guided upwards by reason of its forced guidance on the cam 32 and is thus located in the unlocking position such that in this position the change hub 6 can be pulled or slid easily onto the carrier body 4 which is illustrated on the left in FIG. 2. The displacement ring 42 which for the mounting position on the right is urged in the direction of the hub flange 8 can be cramped in the disengaged position of the locking bolt 34 with the change hub 6, in particular the hub flange 8 and can thus be expediently clamped, which can be performed in a suitable manner, in particular e.g. by means of corresponding steel clamps or a resilient pressure piece. If they are detached, then as a result of the pretensioning of the spring element 24, the blocking bolt 22 is urged to the left, wherein the unlocking bolt 16 which is disengaged as shown in FIG. 2 is urged to the left, i.e. into the interior of the tool holder 2 with the spring element 30 being relieved, such that the locking bolt 34 then engages into the latch recess 38 of the carrier body 4 and therefore the latch lug 36 of the locking bolt 34 lies against the blocking shoulder 40 and therefore the change hub 6 is fixedly connected or coupled to the tool holder 2. In this case, by reason of the illustrated mechanism, high closure forces and at same time low pretensioning are produced. The locking mechanism provides a high level of closure reliability. The form-fitting surface connection of the blocking bolt or the locking apparatus can be configured by means of suitable selection of the size and pitch factors depending upon the application. This described system is suitable in particular for detaching a tool carrier, in this case a change hub, subsea.