Dismantling barrel by unscrewing a drill drum shaft, drill having such a barrel and dismantling method.

Abstract

The invention provides a motorized dismantling barrel (30) for unscrewing a drum shaft (16) belonging to a drill, characterized in that it comprises a vertical tubular body (32) adapted to be immobilized against rotation by radial clamping with movable jaws (28) of the drill, and which, at its upper end, has a female recess (38) adapted to house and immobilize against rotation a head (18) at the upper end of the drum shaft (16). The invention also provides a drill comprising such a dismantling barrel (30) and a dismantling method using such a barrel. Abstract figure: Figure 4

Description

Title of the invention: Dismantling barrel for unscrewing a drill drum shaft, drill comprising such a barrel and dismantling method. Technical field of the invention

[0001] The invention relates to a motorized unscrewing tool for dismantling a spindle of a drill belonging to a drilling machine.

[0002] The invention also relates to a drill equipped with such a dismantling tool.

[0003] The invention further relates to a motorized dismantling method by unscrewing the spindle of a drill press using such a dismantling tool. Technical background of the invention

[0004] In a known manner, particularly in the building and public works sector, for example for drilling foundations, a drilling rig is used which comprises, along its vertical drilling axis: - a superior drilling machine comprising an output drive shaft; - a reel shaft whose upper end head is screwed onto the lower axial end of the output motor shaft to be driven in rotation and axially in both directions by the output motor shaft; - at least one drill bar driven in rotation by the lower end of the reel shaft; - and a pair of movable jaws controlled to radially clamp an axially oriented component arranged substantially coaxially to the drilling axis; and in which the upper end head of the spindle has at least one flat for driving it in rotation or immobilizing it by means of an additional tool.

[0005] In a known manner, the spindle of the reel passes through an injection box in rotation.

[0006] In use, it is necessary to dismantle the reel shaft at the beginning and end of the work site and, if necessary, in the event of control operations.

[0007] Such disassembly requires unscrewing the grinder shaft from the lower axial end of the output motor shaft.

[0008] For this purpose it is necessary to immobilize the spindle of the grinder in rotation, then to rotate the output motor shaft in the direction corresponding to the unscrewing of its lower end until the output motor shaft is separated from the upper end of the spindle.

[0009] To immobilize the rotating drum shaft, by means of an additional tool such as, for example, a key, the operator blocks the upper end head of the drum shaft and he angularly wedges the key against a fixed mast of the drill.

[0010] Such a method of unscrewing presents various disadvantages.

[0011] The key used weighs several kilos and is difficult to handle.

[0012] Furthermore, the key can only be handled with the side safety cage open, which - during unscrewing, if the key flies off - presents risks both for the operator and for personnel present on the site who may be seriously injured.

[0013] Moreover, the operator's control of the various components and their implementation is particularly difficult when the point of disengagement of the reel axis is reached.

[0014] The invention aims to remedy all or part of these drawbacks. Summary of the invention

[0015] To this end, the invention proposes a new tool in the form of a motorized unscrewing barrel for dismantling a spindle of a drill belonging to a drill, for example as defined above, characterized in that it comprises a vertical tubular body which: - is able to be immobilized in rotation by radial clamping, by movable jaws, of a section of its tubular body; - and which, at its upper end, has a female recess suitable for housing and immobilizing in rotation an upper end head of the reel shaft.

[0016] According to other characteristics of the dismantling barrel: - the female indentation has at least one internal flat section capable of cooperating with a complementary internal flat section of the upper end head of the reel shaft; - the female impression is formed in a crown attached to the upper free end of the tubular body; - at its periphery, a section of the tubular body includes at least one shaped element with which the movable jaws cooperate to angularly index and / or lock in rotation the tubular body relative to the movable jaws; - the shape element is attached to the peripheral surface of the wall of the tubular body; - the crown is made of steel hardened by treatment, in particular by nitriding.

[0017] The invention also proposes a drill as defined above, characterized in that it is equipped with a barrel, according to the invention, for motorized dismantling by unscrewing the spindle shaft.

[0018] The invention further proposes a motorized dismantling method by unscrewing the spindle shaft of a drill according to the invention equipped with a protective side cage to secure maintenance interventions by an operator in the reel axis area, characterized in that it comprises the successive steps consisting of: - open the side protective cage; - install the dismantling barrel between the moving jaws of the drill; - dismantle the components and equipment arranged around the reel axis; - close the side protective cage; - control the motorized closure of the drill's movable jaws around a section of the dismantling barrel; - control the axial descent of the reel shaft until the upper end head of the reel shaft is housed and immobilized against rotation in the imprint; - to control the operation of unscrewing the spindle, by rotating it with the output motor shaft, until it is disengaged from the output motor shaft; - to control at least a partial axial retraction of the output motor shaft; - control the motorized opening of the drill's moving jaws; - open the side protective cage again; - access the dismantling barrel and the previously unscrewed reel shaft which is then housed in the dismantling barrel. Brief description of the Figures

[0019] [Fig.1] - [Fig.1] is a perspective view of an example of a reel shaft suitable for being unscrewed by means of a dismantling barrel according to the invention;

[0020] [Fig.2] - [Fig.2] is a perspective view of an example of an embodiment of a drill injection drum which includes an injection box and a drum shaft as illustrated in [Fig.1];

[0021] [Fig.3] - [Fig.3] is a perspective view of an example of the realization of a dismantling barrel according to the invention suitable for allowing the unscrewing of the reel shaft illustrated in figures 1 and 2;

[0022] [Fig.4] - [Fig.4] is a perspective view of the dismantling barrel of [Fig.3] on which the reel shaft is shown partially inserted axially in the dismantling barrel;

[0023] [Fig.5] - [Fig.5] is a schematic representation illustrating five relative positions A, B, C and D of the main components during the implementation of the dismantling barrel according to the invention. Detailed description of the figures

[0024] For the description of the invention and the understanding of the claims, the vertical orientation will be adopted with reference to the axis indicated in the figures.

[0025] In the description that follows, identical, similar or analogous elements will be designated by the same reference numerals.

[0026] Figure 5 schematically represents certain components and constituent elements of a drilling machine comprising, along its vertical axis “V” of drilling: - an upper drilling machine 10 comprising an output drive shaft 12 whose lower end section is formed into a screw 14; - a reel shaft 16 having an upper end head 18 having a tapped hole 20 (See figures 1 and 2) into which the lower end section 14 of the output motor shaft 12 is normally screwed; thus the reel shaft 16 can be driven in rotation and axially in both directions by the output motor shaft 12.

[0027] The lower end 19 of the reel shaft 16 is designed to be detachably connected to and secured with a drill bar (not shown in the figures). For this purpose, this lower end may have a tapped hole.

[0028] The role of the drum shaft 16 is in particular to transmit the drilling forces (rotary and axial) from the upper drilling machine 10 to the drill bar.

[0029] As is known, and as can be seen in Figures 1, 2 and 4, the upper end head 18 of the spindle shaft 16 is generally cylindrical in shape and here has a pair of diametrically opposed external flats 17 such that the external profile of the upper head 18 is not of revolution. Thus, the design of the upper end head 18 allows it to be driven in rotation or prevented from rotating by means of an additional tool.

[0030] As can be seen in [Fig.2], for drilling operations, to constitute an injection reel 20, the reel axis 18 is associated with an injection box 22 - also called a water box - which it passes axially through to inject a drilling fluid which is supplied by a fitting 24 of the injection box.

[0031] The body of the injection box 22 also includes a lateral flange 26 for its attachment to a structural element of the drill such as a drill mast (Not shown in the figures).

[0032] In a known manner, in the lower part, the drill includes a pair of movable and opposed jaws 28 which can be controlled to radially clamp an axially oriented component arranged substantially coaxially to the drilling axis V.

[0033] In order to be able to easily and safely unscrew the spindle 18 to disassemble it from the lower end threaded section 14 of the output motor shaft 12, the invention proposes a disassembly tool, here called disassembly barrel 30, which is illustrated in figures 3 and 4.

[0034] The dismantling barrel 30 comprises a tubular body 32 which is here cylindrical with a circular cross-section over its entire height and which is open at its two opposite upper ends 31 and lower ends 33.

[0035] At its upper end 31, the tubular body 32 is provided with an annular ring 34 which is attached and fixed to the tubular body 32, for example by welding.

[0036] The crown 34 extends the tubular body 32 axially upwards.

[0037] Internally, the tubular wall 36 of the crown 34 delimits a hollow female recess 38, whose profile is not of revolution, which here has two diametrically opposed internal flats 40.

[0038] The internal dimensions of the female recess 38 are complementary to the dimensions of the upper end head 18 of the spindle shaft 16 such that, when the internal flats 40 and the external flats 17 are aligned angularly, the upper end head 18 can be inserted axially, with a slight radial play, into the female recess 38 as illustrated at position C of [Fig.5].

[0039] In this position, the upper end head 18 of the reel shaft 16 is immobilized in rotation by the ring 34 and therefore by the dismantling barrel 30.

[0040] To ensure the function of a tool for dismantling the barrel 30, the tubular body 32 is externally dimensioned so that at least its section 35, here lower, is able to be clamped radially between the movable jaws 28 as can be seen at positions A to C of [Fig.5].

[0041] For the implementation of the dismantling barrel 30, the movable jaws 28 are used to radially clamp the tubular body 32 and immobilize it in rotation around the vertical axis V.

[0042] In particular, in order to angularly index the dismantling barrel 30 in a determined tight position, at its periphery, the tubular body 32 here comprises two diametrically opposed shaped elements 42 with which the movable jaws 28 cooperate.

[0043] Each shape element 42 is presented here in the form of a vertical strip which extends from the lower end 33 over a large part of the height of the tubular body 32.

[0044] Each strip 42 is attached to the peripheral surface of the tubular body 32 on which it is fixed here by welding.

[0045] The tubular body 32 is for example made of steel and the ring 34 is made of hardened steel by treatment, for example by nitriding.

[0046] The safety standards currently applicable for the use of a drilling rig on a construction site require that it be surrounded by a protective side cage (not shown in the figures), in particular to secure maintenance interventions by an operator in the area of ​​the reel axis and to protect other people present on the construction site.

[0047] To implement the dismantling barrel 30 according to the invention, the maintenance operator can proceed in the following manner.

[0048] After opening the side protective cage, the operator installs the dismantling barrel 30 between the movable jaws 28 of the drill by positioning it angularly using the rulers 42. and he dismantles and / or moves the components and equipment arranged around the axis of the reel 16.

[0049] Next, the operator can close the protective side cage, then control the motorized closure of the movable jaws of the drill around the section 35 of the tubular body 32 of the dismantling barrel 30.

[0050] From this state illustrated at position A of [Fig.5], the operator can control the output motor shaft 12 to align the external flats 17 with the internal flats 40, then control its progressive descent through the intermediate state illustrated at position B to reach the axial position of the spindle shaft 16 illustrated at position C of [Fig.5] in which the upper head 18 of the spindle shaft 16 is housed in the recess 38 of the ring 34 and is therefore immobilized in rotation by the ring 34.

[0051] The descent of the spindle 16 is then stopped and the operator controls the rotation of the output motor shaft 12 in the direction corresponding to the unscrewing of its threaded lower end 14 until the output motor shaft and the spindle 16 are separated.

[0052] As can be seen at position D of [Fig.5], the spindle 16 falls inside the tubular body 32 and the operator can raise at least partially the output motor shaft 12.

[0053] After ordering the motorized opening of the movable jaws 28 of the drill, and opening the side protective cage again, the operator can access the dismantling barrel 30 and the previously unscrewed reel shaft 16 which is housed in the dismantling barrel 30.

Claims

Demands

1. Motorized unscrewing dismantling barrel (30) of a drum shaft (16) belonging to a drill, characterized in that it comprises a vertical tubular body (32): - which is able to be immobilized in rotation by radial clamping, by movable jaws (28) of the drill; - and which, at its upper end, comprises a female recess (38) able to house and immobilize in rotation a head (18) of the upper end of the drum shaft (16).

2. Dismantling barrel (30) according to the preceding claim, characterized in that the female recess (38) has at least one internal flat (40) capable of cooperating with an external flat (17) complementary to the upper end head (18) of the reel shaft (16).

3. Dismantling barrel (30) according to the preceding claim, characterized in that the female imprint (38) is formed in a ring (34) attached to the upper free end of the tubular body (32).

4. Dismantling barrel (30) according to claim 1, characterized in that, at its periphery, a section (35) of the tubular body (32) comprises at least one shaped element (42) with which the movable jaws (28) cooperate to angularly index and / or lock in rotation the tubular body (32) relative to the movable jaws (28).

5. Dismantling barrel (30) according to the preceding claim, characterized in that the shape element (42) is referred to the peripheral surface of the wall of the tubular body (32).

6. Dismantling barrel (30) of claim 4, characterized in that the crown (34) is made of heat-hardened steel, in particular by nitriding.

7. Drilling rig comprising, along its vertical drilling axis (V): - an upper drilling machine (10) comprising an output drive shaft (12); - a drum shaft (16) having an upper end head (18) mounted screwed to the lower axial end (14) of the output drive shaft (12) to be driven in rotation and axially in both directions by the output drive shaft (12); - at least one drill bar driven in rotation by the lower end (19) of the drum shaft (16);

8. - and a pair of movable jaws (28) controlled to radially clamp an axially oriented component arranged substantially coaxially to the vertical axis (V) of drilling; and in which the upper end head (18) of the spindle (16) has at least one internal flat (17) allowing it to be driven in rotation or immobilized by means of an additional tool, characterized in that it is provided with a barrel (30), according to any one of the preceding claims, for motorized dismantling by unscrewing the spindle (16). Motorized dismantling method by unscrewing the reel shaft (16) of a drill according to the preceding claim equipped with a lateral protection cage to secure maintenance interventions by an operator in the area of ​​the reel shaft (16), characterized in that it comprises the successive steps of: - opening the lateral protection cage; - install the dismantling barrel (30) between the movable jaws (28) of the drill; - dismantle the components and equipment arranged around the reel axis (16); - close the side protective cage; - control the motorized closure of the mobile jaws (28) of the drill around a section (35) of the dismantling barrel (30); - to control the axial descent of the reel shaft (16) until the upper end head (18) of the reel shaft (16) is housed and immobilized in rotation in said recess (38); - to control the operation of unscrewing the spindle (16), by rotating it through the output motor shaft (12), until it is detached from the output motor shaft (12); - to control at least a partial axial rise of the output motor shaft (12); - control the motorized opening of the movable jaws (28) of the drill; - open the side protective cage again; - access the dismantling barrel (30) and the previously unscrewed reel shaft (16) which is then housed in the dismantling barrel (30).

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