FI75906B - BORRSTAONGSSTYRNING. - Google Patents

Description

1 75906

Drill rod control unit

The present invention relates to a drill rod guide mounted on the front end of a rock drill feed beam and comprising two jaws mounted for pivoting about two axes perpendicular to and parallel to the drilling direction, the jaws in a folded position forming a guide to the drill rod.

Such a drill rod guide is disclosed in U.S. Patent 3,328,052, in which the guide jaws center the drill rod at a particular point, but do not prevent the drill rod from bending outward.

The object of the present invention is to provide a drill rod control device which centers the drill rod and also keeps the rod better straight. This is achieved by the features defined in the claims.

The invention will now be described with reference to the accompanying drawings, which show an embodiment of the invention.

Fig. 1 is a longitudinal view of the feed beam of a rock drilling machine, in which the drill rod control device according to the invention is mounted on the feed beam.

Fig. 2 is a partial view taken in the direction of arrows 2-2 in Fig. 1 and showing the drill rod control device.

Figure 3 is the same view as Figure 2, but in partial section. Fig. 4 is the same view as Fig. 2, but showing the two rotatable guide jaws in a different position.

Figure 5 is a section along line 5-5 of Figure 2.

Fig. 6 is the same view as Fig. 5, but showing the locking bracket in a different position.

Figure 1 shows a drilling powder collection housing 11, which also forms a support for the feed beam and which is mounted at the front end of the feed beam 12. It includes a housing 13 attached to 2 75906 feed beams and having a steel collar 14 adapted to rest on the rock when the feed beam is pressed against the rock. A rubber seal 15 is attached to the collar 13. The drill rod guide device 16 is screwed to the housing 13 and forms this rear body. The outlet pipe 17 is adapted to be connected to a suction device which sucks out the drilling powder.

The rock drilling machine 18 is mounted on a carriage 19 which can be moved axially along a feed beam by a feed motor (not shown). The drill both rotates and strikes the drill rod 20.

The drill rod guide device 16 comprises a washer 21 (Fig. 2) screwed to the housing 13 and provided with two pairs of mounting lugs 22-25. The two guide jaws 26, 27 are pivotally mounted on bolts 28, 29 which extend through the holes in the fasteners 22-25 and are fastened relative thereto. The two brackets 22, 24 have two concentric bores 30 and a locking strap 31 made of round spring steel is inserted into the bores 30 with its ends 32, 33 so that the locking bracket is pivotable about a common axis of the bores 30.

The locking strap 31 is substantially M-shaped and has a central portion 35 and two arms 36, 37. The central portion 35 has a straight bottom portion 38 adapted to abut concentric grooves 39 in the shoulders 41, 42 in the pivoting jaws 26, 27. in the position in which it is brought up over the shoulders 41, 42. Its central portion 35 pivots resiliently rearwardly relative to the arms 36, 37 as shown in Figure 6 until it snaps into the grooves 39 and settles in the plane of the arms 36, 37 as shown in Figure 5. When the locking bracket is in the locking position, the flexible arms 36, 37 then provides a high force despite the fact that it is easy to turn up to the locking position so that the jaws are held with great force in their mechanically defined locking positions 75906 3. The guide 43 formed by the two guide jaws 26, 27 is relatively long. Its length exceeds the diameter and preferably the length is more than twice the diameter. The long guide keeps the drill rod 20 straighter than the short guide.

As the drill rod tends to bend outward, it also tends to pivot the guide jaws 26, 27 upward from their locked guide position. However, the locking strap 31 is relatively rigid when in its locking position and keeps the guide jaws 26, 27 in their guide position and therefore also keeps the handlebar 20 relatively straight. Figure 4 shows the guide jaws 26,27 in their open position, in which they allow the drill bit (not shown) and the extension sleeves (not shown), in the case of a drill rod formed by an extension rod device, to be fitted through the whole unit 11.

Claims (4)

4 75906 Patent Requirements A drill rod guide device mounted at the front end of a feed beam (12) of a rock drilling machine and comprising two jaws (26, 27) rotatably mounted about two axes perpendicular to and parallel to the drilling direction, the jaws in the assembled position forming a guide for the drill rod. e, characterized in that each jaw (26, 27) has a shoulder (41, 42) and that the bracket (31) is adapted to be pivoted up on both shoulders to lock the jaws in the engaged position, and that the bracket (31) is locked on the shoulders (41, 42). ) to the on position for a click call 1a. Drill rod guide device according to claim 2, characterized in that the bracket (31) is bent from the spring steel to a substantially M-shape, the central part (35) being adapted to engage both shoulders (41, 42) and the outer arms (36, 37) the ends (32, 33) are bent outwards and mounted in the bores (30). Drill rod guide device according to Claim 3, characterized in that the shoulders (41, 42) are arranged such that the central part (35) of the spring rod (31) is outwardly flexible so as to form an angle with the outer arms (36, 37). it could snap onto the shoulders, after which it returns to its normal position substantially flush with the outer arms. Drill rod guide device according to one of the preceding claims, characterized in that it comprises a base plate (21) which is adapted to be mounted on the rear part of the combination of the suction head and the feed bar support (11).