MXPA99011396A - Extension drilling system - Google Patents

Abstract

An extension drilling system for use with a semi-automatic drilling rig. The drilling system includes a plurality of extension rods (22) constituting a drill rod string and having co-operating male and female threaded couplings (23) therebetween, and being right-hand rope threaded couplings. A chuck (21) of a drilling rig drives either directly, or via an adaptor, the outside of the female threaded end (24) of an associated extension rod, whereby to result in only one threaded coupling between the chuck and a pair of grippers (27) and to ensure that when the grippers are moved to a clamping position, and the chuck is rotated in reverse, only the desired coupling is uncoupled. The drill rods can have axial passages (28) therethrough in communication with each other and through which flushing fluid is delivered to an associated drill bit and a non-return valve (28a, 29) is incorporated in the passage through at least oneof the drill rods to shorten the delay time in delivering flushing fluid to the drill bit before re-commencement of drilling after a drill rod is added to the drill rod string.

Description

PERFORATION EXTENSION SYSTEM TECHNICAL FIELD This invention relates to a drilling extension system, and more particularly but not exclusively, with drilling extension system for use in semiautomatic drilling rigs and which are used to drill holes (holes) in underground mining operations such as mining for coal extraction when the roof structure of a tunnel will be made safer by the insertion of rock bolts into holes drilled in the roof structure.

ANTECEDENTS OF THE TECHNIQUE In the past, drilling extension in coal mines has been carried out using square threaded rods, such as XRT rods, with a 4TPI Acmé threading. We have experimented with the use of drill rods with threaded coupling with right cable due to its easier uncoupling and with a male thread less susceptible to damage. Although various drilling extension systems have been developed based on experimental work, we find that they do not work with semi-automatic drilling equipment. The main problem with conventional drill rods for drilling extension systems, when used in semiautomatic drilling equipment is that when the drill string (a series of drill rods coupled together) are to be uncoupled, there are two threaded couplings between the fasteners and the tool sleeve. As the fasteners are operated, and the tool sleeve rotates slowly in the reverse direction, the threaded joint between the drive adapter and the lower extension rod are uncoupled which is undesirable and different from the desired decoupling between the bottom extension rods and the next down. A secondary problem is the use of a drive adapter that uses a useful arrow height on the equipment so it reduces the length of the extension rods that can be used. Therefore, an object of the present invention is to solve, or at least minimize, the above problems with known drilling extension systems when associated with semiautomatic drilling equipment.

DESCRIPTION OF THE INVENTION The invention therefore considers a drilling extension system for use with semiautomatic drilling equipment, the drilling system includes a plurality of extension rods that constitute a string of drill rods and each has cooperating male and female threaded couplings. between them, the couplings are threaded couplings with right cable and where, when they are used, a tool sleeve of a drill rig directly drives them, or by means of an adapter, the outside of the female threaded end of an extension rod associated, thereby resulting in only a threaded coupling between the tool sleeve and the set of fasteners and to ensure that when the fasteners are moved to the clamping position, and the sleeve is rotated in the reverse direction, only the couplings are disengaged that are desired. Preferably, the drill rods have axial passages therethrough in communication with each other and through which discharge fluid is supplied to the associated drill bit. Preferably a non-return valve is incorporated in at least one of the drill rods to shorten the delay time in the supply of discharge fluid to the drill bit before restarting the drilling after a rod has been added. of drilling to the string 'of drill rods. Preferably, the drill rods are of hexagonal cross section or of any other suitable cross section and can be forged or welded rods which are heat treated selectively or completely. The invention also considers a drill extension rod for use in a drilling extension system defined above.

BRIEF DESCRIPTION OF THE DRAWINGS Two preferred embodiments of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a longitudinal side elevation view of a piercing extension system according to a first preferred embodiment of the invention, " Figure 2 is a longitudinal side elevational view of an extension rod as used in the system of Figure 1, Figure 3 is a longitudinal, partially sectioned, side elevation view of an alternative direct drive sheath for In the drilling extension system of FIGS. 4 to 5, FIG. 4 is a longitudinal sectional elevation view, partially sectioned, of a drilling extension system according to the first preferred embodiment of the invention, "the Figure 4A is a cross-sectional view taken along line AA of Figure 4, Figure 4B is a cross-sectional view taken along line BB of Figure 4, Figure 5 is a view in longitudinal side elevation of a drill extension rod as used in the system of figure 4, figure 6 shows lateral elevation views and an end view of a bro There is also a sectional view of the perforation drill for the system of Figures 1, 2 and 3, and Figure 7 shows side elevation views and an end view of a drill bit for use in the system of Figures 4 and 5.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES With reference to figures 1 and 2 of the drawings, the drilling extension system of this first preferred embodiment of the invention, and which is generally indicated with the number 20, uses a driver tool sleeve 21 mounted on a mining screwdriver. roof (not shown) having a pair of clamp clips 27. The driver tool sleeve can have a TL2 tool sleeve as manufactured by McSweeney Inc. of the United States and the driver tool sleeve directly rotatably drives a string of extension rods 22 (see also figure 2 of the drawings), coupled together by one or more couplings 23 comprising receptacles 24 threaded females with cooperating right cable at one end of the respective rods, and male members threaded with right cable carried at the other end of the respective rods. The ends of the drill rods, when coupled together, abut each other by means of the shoulders 22a that surround the male member 25 and rest on the end faces 22b that surround the entrance of the receptacles 24. The male member 25 at the outer end of the outermost rod is coupled to a drill bit (not shown in Figures 1 and 2), but which may be the drill bit 16 shown in Figure 6 of the drawings. Axial passages 28 are provided through the respective drill rods and in communication with each, and through which discharge fluid can be supplied through the associated drill bit. In this preferred embodiment, the passages 28 through each of the drill rods are stepped at the number _28a to provide a transition between larger and smaller diameter portions of the passage, thereby providing valve housings that are part of the ball valve mechanisms, with the rest of the mechanisms consisting of stainless steel or glass spheres 29 which are selectively housed on, or dislodged from, the valve housing 28a, as required to shorten the delay time in the Supply of discharge fluid to the drill bit before re-starting drilling after the drill rod has been added to the drill string. Figure 3 of the drawings shows a modified direct (alternative) driving tool sleeve for use in the drilling extension systems of the figures 4 to 5, and in fact, the preferred driver tool sleeve, and in which there is a modular assembly 21a comprising a male driver member 21b having a driver shaft 21c and engaging a female driver member 21d with a receptacle 21e . The driving members are engaged by bolts 21f through holes 21g in the male driving member 21b and inside threaded blind holes 21h in the female driving member 21d with interposed spring washers 21i. The male and female members can also be "fastened" together, i.e., interengaged. The receptacle 21e receives a sealing member 21j which can be formed of polyurethane, can be molded around a stainless steel washer body and which is housed on a stage 21k at the end of the male drive member 21b. The modular driver tool sleeve of this embodiment, being configured in two separate parts, allows the driving members 21b and 21d to be interchangeable for different driving configurations, and also allows the sealing member 21j to be replaced when worn. With reference to Figure 4 of the drawings, the drilling extension system of the second preferred embodiment of the invention, indicated generally with the numeral 10, uses an impeller tool sleeve 11 mounted on a Mining / Roof screwdriver (not shown). The impeller tool sleeve can be a TL2 tool sleeve, as manufactured by McSweeney Inc., of the United States. According to this preferred embodiment of the invention, and also with reference to Figure 5 of the drawings, the driving tool sleeve 11 rotatably drives a string of piercing extension rods 12, in this preferred embodiment by means of an adapter 19 of tool holder sleeve, with the drill rods coupled together by one or more couplings 13 formed of female receptacles 14 threaded with right cable cooperating at one end of the respective rods and with threaded male members 15 of right chain at the other end of the rods. respective rods. The ends "of the drill rods, when engaged, abut each other by means of the shoulders 12a surrounding the male members 15 and resting on the end faces 12b surrounding the inlets to the receptacles 14. The member The male on the outer end of the outermost rod is coupled to the drill bit (not shown in Figures 4 and 5) which may be a drill bit 16 shown in Figure 7 of the drawings. of clamping clips 17 carried by the Mining / Roofing screwdriver serves to hold the drill string during the engagement and disengagement of the drill rod Axial passages 18 are also provided through the respective drill rods and in communication with each other and through which discharge fluid can be supplied to the associated drill bit With reference to figures 4 and 5 of the drawings, the internal detail of the adapter 19 of tool sleeve is according to that shown in Figure 4A of the drawings and is shaped as a hexagon 19a deflected by 20 ° of rotation. A tool holder sleeve cover 19b, as shown in Figure 4B, is bolted to the rest of the tool adapter sleeve by the bolts 19c. The cover provides a hole 19d for the drill rod for what is placed inside and which has a normal hexagonal shape. The end of the drill rod which is placed inside the drilling adapter 19, and which incorporates the female receptacle 14 which does not engage in a driven manner to the tool adapter sleeve adapter, has a hexagonal exterior 12c and above it a Rounded section 12d. When the end of the drill rod is placed inside the tool adapter sleeve adapter, the hexagon 12c at the end of the rod is aligned with the hexagonal hole 19d through the tool holder sleeve cover 19b. Then the rod slides down into the sleeve adapter, tool holder to its full length, and a positive rotation of the tool adapter sleeve is started which rotates 20 ° in relation to the rod and the impeller is placed in the plane of the part. hexagonal 19a in the tool sleeve adapter which engages the hexagonal end 12c on the rod and thereby rotatably drives the rod. The rounded section 12d on the rod is provided so that, as the rod rotates through 20 °, the hexagon through the tool holder sleeve cover 19b is not attached on the rod. To the extent that a positive rotation is maintained in the tool adapter sleeve adapter, the rod can not be removed since the two hexagons are misaligned by 20 ° and the rod needs to rotate 20 ° so that the corners of the hexagon 12c free the hexagonal hole 19d through the cover 19b tool adapter sleeve in order to remove the rod. The driving tool rod as described above provides a torsional immobilization action between the tool sleeve and the rod, which improves the safety of the drilling system due to the immobilization of the rod in the driving tool sleeve and at the same time maintains a positive rotation In the case of both embodiments of the invention, the drill rods are of hexagonal cross section, as previously described with reference to the embodiment of Figures 4 and 5, or of rounded cross section or of any other shape in their cross section suitable for what can be driven by the tool holder adapter 19 in the case of the embodiment of FIGS. 4 to 5 or directly by the driver tool sleeve 21 or 21a in the embodiment of FIGS. 1, 2 and 3. The rods Impellers can be forged or welded rods which are heat treated selectively or completely.

Claims (8)

1. A drilling extension system for use in semiautomatic drilling equipment, the drilling system includes a plurality of extension rods that constitute a string of drill rods, and each has cooperating male and female threaded couplings therebetween, characterized because the couplings are threaded couplings with right cable and where, when used, an impeller tool sleeve of a drill rig directly drives the outside of the female threaded end of an associated extension rod, resulting in only a threaded coupling between the tool sleeve and a set of fasteners, and to ensure that when the fasteners are moved to a clamp position, and the tool sleeve is rotated in the reverse direction, only the coupling that is desired is decoupled.

2. The drilling extension system, as described in claim 1, wherein the drill rods have axial conduits therethrough in communication with each other and through which discharge fluid is supplied to an associated drill bit. .

3. The drilling extension system, as described in claim 2, wherein the axial passage through at least one of the drill rods incorporates a non-return valve to shorten the delay time in the fluid supply of the drill. Discharge to the drill bit before re-starting drilling after the drill rod is added to the drill string.

4. The drilling extension system, as described in any of the preceding claims, wherein the drill rods are of hexagonal or rounded cross section or any other suitable cross section so that they can be driven by the impeller tool sleeve, and either directly or by means of an adapter having a receptacle therein of similar cross section. _

5. The drilling extension system, as described in claim 4, wherein the cooperation between the driving tool sleeve or the adapter and the associated drill rod are directly associated therewith in such a way that the relative rotational movement limited between they misalign the respective cross sections to prevent separation of the rod and at the same time maintain the drive coupling.

6. A drill extension rod for use in the drill extension system defined in claim 1, wherein the drill rod has male and female threads at opposite ends thereof, characterized in that the threads are threaded with wire right and wherein the outside of the female threaded end of the rod is of hexagonal or rounded cross section or any other suitable cross section so that they can be rotationally driven.

7. The piercing extension rod, as described in claim 6, wherein the piercing rod has an axial passage therethrough and through which discharge fluid can be supplied to an associated piercing drill.

8. The drill extension rod, as described in claim 7, wherein the axial passage through the drill rod incorporates a non-return valve.