FR2532357A1 - SLEEVE HOLDING DEVICE FOR EXTENSION ROD DRILLING APPARATUS - Google Patents

Abstract

THE INVENTION RELATES TO A SLEEVE RETAINING DEVICE FOR AN EXTENSION ROD DRILL. THE AIM OF THE INVENTION IS TO PROVIDE A SYMMETRICAL TIGHTENING OF THE SLEEVE, FOR BETTER SECURITY AND LESS STRESS ON THE THREADS. THE DEVICE OF THE INVENTION INCLUDES TWO ARMS WITH JAWS 12, 13 MOUNTED ON THE SAME AXIS ON THIS FRAME, PREFERABLY LIKE SCISSORS, AND PROVIDED WITH JAWS 14 FACING EACH OTHER, AND A MEANS OF ACTUATION 15 CONTROL BY FLUID PRESSURE WHICH ROTATES THE JAW ARMS TO DRIVE THEM INTO A CLAMPING POSITION IN WHICH THE JAWS FORM A HOUSING WHICH CAN BE CLAMPED AGAINST THE COUPLING SLEEVE 6 OF THE DRILL ROD. THE ACTUATION MEANS 15 IS CONNECTED TO THE JAW ARMS 12, 13 IN A WAY THAT THEY AND FOR IT FORM AN ASSEMBLY THAT CAN ROTATE FREELY WITH RESPECT TO THE BUILDING 8 AROUND THE AXIS 11 ON WHICH THE JAW ARMS ARE MOUNTED, D 'OR SELF-CENTERING ON THE SLEEVE 6.

Description

1 2532357

  The present invention relates to a sleeve retainer for a rigging apparatus with a longitudinal rod comprising a frame that is mounted on an advance beam of the apparatus to be drilled, two arms with jaws mounted on the same axis on this frame. and provided with jaws facing each other, and pressurized fluid actuated actuating means joined to said arms so that they can be rotated into a clamping position in which the jaws form a tightly fitting housing. against a coupling sleeve of a drill pipe and in an open position in which the jaws are spaced apart for the opening of said

housing.

  A sleeve retainer of this type is used in drilling long holes to prevent the coupling sleeve from turning when the drill shaft is rotated to disengage it from the sleeve.

and remove the drill rod.

  In known Longe rod drilling apparatus, the coupling sleeve of the drill pipe,

  when uncoupling the drill rods, is now

  held in engagement with the rod by braking the sleeve eccentrically while rotating the shaft to disengage the sleeve Gold, this has disadvantages The sleeve being braked eccentrically, braking tends to push against the Threading of the shaft, which causes a blockage of the thread and hinders the opening In addition, the braking of the sleeve can cause a simultaneous release thereof from the drill pipe and the tail, in which case the sleeve falls to the ground , which is dangerous

for the driller.

  The Swedish patent 391 770 has a sleeve brake intended to be mounted at the front end of a drill This brake comprises a long swivel arm which supports a connecting rod provided with jaws fixed in an elastic manner When it is desired to disengage the sleeve, , by means of the arm, turn the connecting rod for the app Liquer on The sleeve in order to block it to prevent it from turning This device allows to block only hexagonal sleeves and, besides, its use requires

  a lot of space around the drill.

  The present invention aims to provide a

  sleeve retainer which avoids the inconveniences

  aforementioned and allows automatic centering

jaws around the sleeve.

  The invention achieves this object by virtue of the fact that the actuating means is connected to the jaw arms so that they and it form a rotatable assembly.

  freely relative to the frame around the axis on the-

which mounted the bit arms.

  The invention is based on the idea that if one

  mount the actuating means to act alone-

  between the bent arms, it will not prevent a

  these arms relative to the frame about the axis on which they are mounted If the jaw arms and the actuating means can rotate

  only one block, both arms will be able to correct

  their position around the sleeve when the jaws will close under the action of the actuating means, so that the jaws will center accurately by

  relative to the axis of the sleeve when the means of action

  The threads of the sleeve and the tail will not be subjected to radial forces, so that the threading

  will open more easily and wear out less

  retaining pin allows to block sleeves of all shapes and its operation does not require a lot of lace p Another advantage is that the sleeve can not

  accidentally falling as the bit

during the entire release.

  The invention is described in more detail below with the aid of the drawing, in which: FIG. 1 is a schematic side view of a

  extension rod drilling apparatus provided with a

  sleeve retainer according to the invention, Fig. 2 is an enlarged side view of the sleeve retainer,

  Figures 3 and 4 are end views of the

  positive sleeve retainer respectively in positive

  and in the open position, and FIGS. 5 and 6 diagrammatically show two other possible embodiments of the retaining device.

of sleeve.

  The extension rod drill apparatus represents

  FIG. 1 comprises a displaceable drill 1

  along a beam 2 in advance by means of a mechanism

  me in advance (not shown) The advance beam sup-

  carries a sleeve retainer 3 and a guide

  4 for a drill rod 5 joined by means of a manhole

  coupling pin 6 to the auger shaft 7.

  The sleeve retainer 3 comprises a frame 8 provided with a support plate 9 and an upwardly directed support 10 fixed to this plate. The support plate is intended to be mounted in a conventional manner by guide means (not shown in FIG. represented) on

  longitudinal rails provided on the feed beam 2.

  The support 10 supports an axis 11 on which are mounted two jaw arms 12, 13 which intersect in the manner of scissors Ce-s two arms are formed of levers with two arms at the inner end of which are fixed replaceable jaws 14 which have surfaces of

  Arc-tightness 14 a The radius of curvature of these surfaces

  these correspond substantially to the radius of curvature of the

  cylindrical outer surface of coupling sleeve-

  When the jaw arms are in the clamping position shown in FIG.

  curvature of the clamping surfaces of the jaws are confused

  due to the fact that these surfaces form a cylindrical housing for the coupling sleeve The axis A of this housing passes through the common center of curvature and is parallel to the axis 11 on which are mounted the

jaw arm.

  The outer ends of the levers forming the jaw arms 12, 13 are respectively connected by an axis 16 and an axis 17 to the cylinder and the piston rod of a hydraulic actuating means mounted therebetween. cylinder are indicated by the mark 18 The arrangement is such that the actuating means can rotate

  the jaw arms between the clamping position

  3 and the opening position repre-

shown in Figure 4.

  The frame 8 is intended to be mounted on the rails of the feed beam 2 so that the axis A of the cylindrical housing formed by the jaws coincides with the axis B

  of the drill rod 5 joined by the coupling sleeve

  6 to the shaft 7, that is to say with the axis of drilling

(figure 1).

  The sleeve retainer works

as follows.

  When we want to clear the tail of the sleeve, we

  rotates the jaw arms by means of

  to bring them into the tightening position

  to clamp the jaws on each side against the sleeve.

  Because the jaw arms rotate about the same axis and the actuating means acts only between them and is not supported by the frame at all, the bit arms and the actuating means form a unit which

  can turn freely, so that the jaws

  trent automatically on the axis of the sleeve when i Ls

  squeeze against the latter After blocking the man-

  chon this way, we turn the tree in the

direction of opening of the thread.

  The jaws are opened by pivoting the arms by means of the actuating means so as to bring them into the open position, or the back pressure of the

  hydraulic circuit of the actuating means can pro-

  the rotation of the arms to bring them into the open position when cutting the control pressure of the

actuating means.

  When the control distributor of the medium

  actuator is in the free position, the counter-pressure

  hydraulics, a spring or a means

  analog holds the bit arms in a position of

  flush against shoulders 19 and 20, so that the vibrations of the drill and the beam in advance

  can not beat the arms against the shoulder-

  which improves the sustainability of the system and

  Bearings The sleeve retainer 3 is attached to

  characterized by a resilient coupling 21 comprising a rod 22 which is parallel to the feed beam and is slidably mounted in a support 24 fixed to the sleeve retainer and in a support 25 fixed to the drill. of three springs 26 placed one between the two supports and the others between each support and a stop provided

at the end of the stem.

  This coupling allows a movement of the device

  the sleeve retainer with the drill and also a relative movement of these two organs

  this, the drill can move back when unscrewing the file-

  while the sleeve retainer remains stationary, and the sleeve does not interfere with relative axial movement between the sleeve and the shaft

  when these parts are unscrewed.

  The other possible embodiments shown in FIGS. 5 and 6 do not differ from that which is

  shown in Figures 2 to 4 with respect to

  FIG. 5 shows a disposition in which the jaw arms 12, 13 are two-armed levers, the jaws 14 are

  ends of these levers and the means of

  15 is connected to the opposite ends of these levers, as in the arrangement of Figure 3, but here the bit arms are not mounted cross and

  remain on the same side with respect to their articulated axis La-

  11, so that the clamping of the jaws is

  obtained by extension of the actuating means, to the

  FIG. 6 shows another arrangement which differs from the preceding in that the jaw arms 12, 13 are single-arm levers, the jaws 14 are placed at ends close to these levers and the actuating means 15 is mounted at points between the ends of

each lever.

  The drawings and the description relating thereto

  are intended only to explain the idea of the invention

  The sleeve retainer of the inven-

  can be modified in detail in the context of

demands.

7 2532357

Claims (8)

  1 Sleeve retainer for   wire rod with extension rod, comprising: a frame (8) mounted on a feed beam (2) of the drilling apparatus, two jaw arms (12, 13) pivotally mounted on   the same axis on this frame and provided with jaws (14) is   face, and an actuating means (15) controlled by   pressurized fluid attached to these arms so that   they can be pivoted into a clamping position in which the jaws form a housing which can be clamped against a coupling sleeve (6) of a drill pipe (5) and in an open position in which the jaws are spaced apart for opening said housing, characterized by the fact that the actuating means (15) is connected to the jaw arms (12, 13) so that they and it form an assembly which can rotate freely relative to to the frame (8) about the axis (11) on which have got their hands up.   2 sleeve retainer according to claim 1, characterized in that the jaw arms (12, 13) are levers with two arms, the jaws (14) are placed at ends adjacent to these Levers and the means of actuation (15) is connected to the ends opposite of these levers.   Sleeve retaining device according to Claim 2, characterized in that the arms   jaws (12, 13) are mounted in a cross like scissors.   4 sleeve retainer according to claim 1, characterized in that the jaw arms (12, 13) are single-arm levers, the jaws (14) are placed at ends adjacent to these levers and the means actuator (15) is mounted at points   located between the ends of each lever. 8 2532357   Sleeve retainer according to one   any of claims 1 to 4, characterized by   that the jaw arms (12, 13) are mounted in the   frame (8) by means of a common articulation axis (11).   6 Sleeve retainer according to one   any of claims I to 5, characterized by   that the jaw arms (12, 13) are provided with separate jaws (14) having arcuate clamping surfaces (14 a), the radius of curvature of these surfaces corresponding approximately to the radius of curvature of the outer surface   cylindrical coupling sleeve (6).   7 Sleeve retainer according to one   any of claims 1 to 6, characterized by   that the frame (8) is provided with stops (19, 20) against which the jaw arms (12, 13) are supported in the open position under the action of a counter-pressure of the means of actuation (15) of a spring or a similar element.   8 Sleeve retainer according to one   any of claims 1 to 7, characterized by   the frame (8) is provided with an elastic coupling   tick (21) by which it can be joined to the drill (1) to move elastically with it and relative to her.