EP1533470B1 - Drilling and bolting head for a bolting machine - Google Patents

Description

The present invention relates, in general, the so-called bolting machines, intended for the execution of underground work, in particular in mining operations. This invention relates, more particularly, to a drilling and bolting head, also here more simply referred to as "bolting head", intended to equip such a bolting machine, the bolting head being of very compact structure, and adapted for use in low-rise mine galleries, this head being mounted on a carrier vehicle itself of low height.

A bolting head, like that of the document EP 0 034 134 , is an assembly supported by a carrier vehicle and allowing to mechanically install retaining bolts in the roof of a mine gallery.

In traditional design, a bolting head is mounted at the end of a support arm of changeable length. The assembly thus formed by the bolting head and its support arm is bulky and does not allow use in low pit galleries; in this regard, one must consider not only the bulk of the bolting head and its support arm, but also the large amplitude that results for the feeding movements of the bolting head in each desired working position , and the movements of passage of this bolting head from one position to another.

The present invention aims to avoid these drawbacks, by providing a drill head and bolting structure very compact, suitable for use and transport in mine galleries of low height and in other conditions where the available space is limited , thanks to a reduction in size, both in height and laterally and in advance, while maintaining handling qualities and ease of use, as well as good stabilization in working position.

• un support intermédiaire, monté coulissant en direction verticale, au moins en position d'utilisation, sur un élément apte à être lié à un véhicule porteur, et définissant au moins en position d'utilisation un axe de rotation vertical ;
• une poutre verticale montée pivotante, suivant l'axe vertical défini par le support intermédiaire, et munie de moyens de guidage vertical ;
• une glissière disposée verticalement, montée coulissante sur les moyens de guidage vertical équipant la poutre verticale, et munie elle-même de moyens de guidage vertical;
• une perforatrice, avec moyens de foration et de pose de boulons, montée coulissante sur les moyens de guidage vertical équipant la glissière ;
• une plaque d'appui horizontale, utilisable comme étançon, prévue dans la partie supérieure du support intermédiaire ;
• pour la commande du déplacement vertical du support intermédiaire, un vérin disposé verticalement suivant l'axe de rotation vertical défini par ledit support ;
• des moyens motorisés de commande du déplacement de la glissière relativement à la poutre verticale, et du déplacement de la perforatrice relativement à la glissière.

For this purpose, the subject of the invention is essentially a drilling and bolting head, of the kind previously mentioned, which comprises in combination:

• an intermediate support, slidably mounted in the vertical direction, at least in the position of use, on an element adapted to be connected to a carrier vehicle, and defining at least in the position of use a vertical axis of rotation;
• a vertical beam pivotally mounted along the vertical axis defined by the intermediate support, and provided with vertical guide means;
• a slide arranged vertically, slidably mounted on the vertical guide means equipping the vertical beam, and itself provided with vertical guide means;
• a perforator, with means for drilling and installing bolts, slidably mounted on the vertical guide means equipping the slide;
• a horizontal support plate, usable as a prop, provided in the upper part of the intermediate support;
• for controlling the vertical displacement of the intermediate support, a jack arranged vertically along the vertical axis of rotation defined by said support;
• motorized means for controlling the displacement of the slide relative to the vertical beam, and the displacement of the perforator relative to the slideway.

Thus, the bolting head object of the invention has an orientable portion about a vertical axis, which is arranged a jack which plays the dual role of "advance block" for the slide, and stanchion to support the roof of the gallery, this principle of construction allowing a particularly compact realization and integrating all the necessary functions.

In an advantageous embodiment, from the point of view of compactness, the intermediate support is mounted and guided in translation on a table disposed transversely, and provided with means for connecting it to one end of the carrier vehicle, motorized means being provided for control the movement of the slider along the table. This embodiment eliminates the usual support arm.

The means, provided for connecting the table with one end of the carrier vehicle, are preferably arranged to allow the lifting and lowering of this table. These connecting means may comprise, on the one hand, articulating yokes of the table, about horizontal axes, to bases fixed on the end of the carrier vehicle, and on the other hand, at least one jack mounted between the carrier vehicle and said table.

The means for controlling the movement of the slider along the table may comprise a motor carried by said table, and an endless chain transmission connecting the motor to the slider.

However, it remains conceivable for the intermediate support to be slidably mounted vertically on a front part of a telescopic support arm whose rear element is pivotally connected about a vertical axis with one end of the vehicle. carrier, motorized means being provided for controlling the pivoting of the support arm and the telescoping of the support arm. This other embodiment retains, globally, a compact structure.

In addition, the intermediate support may be pivotally mounted about a longitudinal axis, relative to the slide or relative to the front portion of the support arm, according to the embodiment, to "fold" the bolting head when is not in use, which reduces its height and facilitates the movement of the bolting machine equipped with this bolting head.

In a particular embodiment of the bolting head object of the invention, the slide is provided with vertical rear guides, slidably mounted in guide pads fitted to the vertical beam, and is also provided with anterior vertical guides, on which is mounted sliding the perforator. The motorized means for controlling the displacement of the slide relative to the vertical beam, and the displacement of the perforator relative to the slide, advantageously comprise a single motor, in particular carried by the vertical beam, which through at least one chain passing on return wheels controls the aforementioned displacements. A telescopic device is thus obtained, in which the total travel of the perforator results from the addition of the displacement of the slide relative to the beam, and the displacement of the perforator on the slide.

In a preferred embodiment of the invention, the bolting head further comprises means for pre-positioning, in a desired position or angular range, the orientable assembly constituted by the vertical beam, the slide and the punch, relative to the intermediate support. These means may comprise, on the upper part of the intermediate support, a pre-positioning sector provided with a series of notches and articulated on the top of the vertical beam, a locking lever capable of being introduced into the notches in the pre-positioning sector.

According to another possibility, said pre-positioning means comprise, on the intermediate support, a horizontal upper plate in which are formed, on the same circle centered on the vertical axis of rotation defined by said support, at least two successive lights in arc of circle, of angular extent corresponding to the amplitude of the rotation of the slide between the drilling position and the insertion position of a bolt, while on the aforementioned beam is mounted a vertical cylinder whose element mobile, directed upward, is able to be engaged in one of the choice of lights in an arc. The ends of the arcuate lights are here the stops that define, for each selected work area, the two particular positions of the slide.

The perforator, which is a compact perforator performing at each cycle of operation the drilling of a hole followed by the installation of a bolt, is advantageously mounted on a support, which also laterally carries a vertical housing, for the positioning and the introduction of a bolt, said housing and the drilling line of the drill being located on the same circle centered on the aforementioned vertical axis.

Overall, the invention thus provides a particularly compact bolting head, both in the vertical direction and in the front-to-back direction, particularly in the case where the usual support arm is replaced by a table providing a transverse movement and also lifting, while the vertical axis of advance to the block coincides with the pivot axis of the slide. The telescopic slide, adapting to the available height, fits vertically in the space of the machine, when it is retracted, which allows the machine to move between two successive positions of drilling and laying. a bolt, without having to fold the slide. Thus, the bolting head design according to the invention eliminates a rotation movement usually required, which saves time and therefore provides a productivity gain.

In addition, the pre-positioning means of the slide, and the housing provided for the positioning and the introduction of a bolt, make the bolting head of the invention manageable and easy to use. In this connection, all the motorized movements of translation and rotation of the bolting head are preferably radiocontrolled movements.

• Figure 1 est une vue d'ensemble, en perspective, d'une machine de boulonnage, équipée d'une tête de boulonnage conforme à la présente invention, montée sur une table transversale ;
• Figure 2 est une vue en perspective de la tête de boulonnage de figure 1 seule ;
• Figure 3 est une autre vue en perspective de cette tête de boulonnage ;
• Figure 4 est une vue de côté de la tête de boulonnage des figures 2 et 3 ;
• Figure 5 est une vue en plan par-dessus de ladite tête de boulonnage ;
• Figure 6 est une vue partielle, en perspective, d'une tête de boulonnage analogue à celle des figures précédentes, mais montée sur un bras-support ;
• Figure 7 est une vue en coupe longitudinale de la tête de boulonnage et de son bras-support, selon la figure 6 ;
• Figure 8 est une vue de côté, avec coupe partielle, d'une autre tête de boulonnage selon l'invention représentée ici sans sa perforatrice ;
• Figure 9 est une vue en plan par-dessus de la tête de boulonnage de figure 8, la partie supérieure de celle-ci étant retirée ;
• Figure 10 est une vue en plan par-dessus de cette tête de boulonnage complète.

The invention will be better understood from the description which follows, with reference to the schematically appended drawing showing, by way of examples, some embodiments of this drilling and bolting head:

• Figure 1 is an overview, in perspective, of a bolting machine, equipped with a bolting head according to the present invention, mounted on a transverse table;
• Figure 2 is a perspective view of the bolting head of figure 1 alone ;
• Figure 3 is another perspective view of this bolting head;
• Figure 4 is a side view of the bolting head of the Figures 2 and 3 ;
• Figure 5 is a plan view over said bolting head;
• Figure 6 is a partial view, in perspective, of a bolting head similar to that of the previous figures, but mounted on a support arm;
• Figure 7 is a longitudinal sectional view of the bolting head and its support arm, according to the figure 6 ;
• Figure 8 is a side view, partly in section, of another bolting head according to the invention shown here without its perforator;
• Figure 9 is a plan view over the bolting head of figure 8 the upper part thereof being removed;
• Figure 10 is a plan view over this complete bolting head.

Referring first to Figures 1 to 5 , will fully describe a first embodiment of the bolting head, object of the present invention.

The figure 1 represents, as a whole, a bolting machine for mining operations, with a carrier vehicle 1 which, in the illustrated example, comprises a rigid monoblock frame 2 and four driving wheels 3, 4, that is two wheels 3 located on the right side of the chassis 2, and two other wheels 4 located on the left side of the frame 2. Of parallelepipedal general shape, this frame 2 has a flat and horizontal upper face, located at a relatively low height (especially less than one meter) above the ground on which the carrier vehicle 1 moves by its wheels 3, 4. Each drive wheel 3, 4 has an independent suspension, parallelogram, and is driven by a hydraulic motor, powered by a pump unit 5, from a hydraulic tank 6.

The chassis 2 of the carrier vehicle 1 is equipped, at the front, with a bolting head generally designated by the reference 7, and more particularly the object of the present invention, the bolting head 7 being shown in more detail on the Figures 2 to 5 .

The bolting head 7 is mounted on a table 8, arranged in a transverse horizontal direction, at the front of the chassis 2 of the carrier vehicle. The table 8 is provided, at the rear, with two clevises 9 directed upwards and articulated, each around a horizontal axis 10 oriented transversely, to a base 11 fixed on the front frame 2. A central cylinder 12 , mounted between the frame 2 and the table 8, ensures the lifting or lowering of this table 8.

On the table 8 is mounted, and guided in translation, a slider 13 movable transversely by means of a motor 14, carried by an end of the table 8, and via an endless chain transmission. On its front face, the slider 13 carries guide pads 15 arranged vertically, which constitute two vertical sliding guides.

A mobile support 16, provided with two vertical lateral slides 17, is slidably mounted vertically, by its two slides 17, in the guide pads 15 carried by the slider 13. A jack 18, disposed along a vertical axis 19, controls the vertical sliding movement of the support 16 in the guide pads 15. This support 16 is provided in its upper part with a horizontal support plate 20, usable as a stanchion.

The lower and upper portions of the movable support 16 serve as bearings for the rotational mounting, along the vertical axis 19 of the jack 18, of a vertical beam 21 provided at the front with guide pads 22 arranged vertically.

A vertically disposed drilling and bolting slide 23 is provided with a pair of vertical vertical guides 24 slidably mounted vertically in the guide shoes 22 of the beam 21. The slide 23 is also provided with a pair of vertical guides prior 25, on which is mounted slidably in the vertical direction, a punch 26.

The assembly constituted by the beam 21, by the slide 23 and by the perforator 26 is thus pivotably mounted around the vertical axis 19. This assembly can be pre-positioned, in the desired angular position, by a pre-positioned sector. positioning 27, carried by the upper support part 16 and provided with a series of notches 28, in one of which is introduced a locking lever 29 articulated on the top of the beam 21.

A hydraulic motor 30, carried by the upper part of the beam 21, controls, via a chain passing over various return wheels, such as that visible at 31, on the one hand, the vertical translation movement of the slide 23 relative to the beam 21 and, on the other hand, the vertical translation movement of the punch 26, relative to the slide 23; these two movements add up to provide the total stroke of the perforator 26, according to a principle of "telescoping".

The perforator 26, of compact structure and in particular of small vertical dimension, comprises guide pads 32 cooperating with the previous vertical guides 25 of the slideway 23, a rotation motor 33 associated with a gearbox 34, and a striking device 35. A plate 36 for protecting the rear part of the perforator is carried by the lower part of the slide 23.

This drill 26 is mounted on a support 37, provided with guide pads 32, which still laterally carries a vertical housing 38 used to position and introduce a bolt into the drilled hole. The housing 38, located on the side of the perforator 26, is located on the same circle (centered on the vertical axis 19) as the drilling line of the perforator 26. Two stops 39 ensure the proper angular positioning of the slide 23 , in the drilling position or in the insertion position of a bolt.

The upper part of the beam 21 still carries an upper guide 40 to "bezel" for the drilling tool. It has been represented, in 41, a mining plate taking place, in the usual way, between the bolt and the wall of the mine gallery in which the bolt is depressed.

Finally, as partially shown in 42 figure 4 another cylinder fixed vertically on the slide 13 carries the stanchion downwards.

A radio control device, not shown, is provided for the remote control of the various motorized movements of translation and of rotation of the bolting head 7, including rotation about the vertical axis 19 (controlled by an actuator not visible in the drawing).

For the use of this bolting head 7, the assembly consisting of the beam 21, the slide 23 and the drill 26 is first pre-positioned, for good visibility and to fix in a precise angular range the drill positions and bolt introduction. The strut is made by the jack 19 and the support plate 20 of the support 16, on the one hand, and by the cylinder 42, on the other hand, to support the roof of the mine gallery while taking firm support on the ground this mine gallery.

It is then possible, by means of the perforator 26, to drill a hole in the roof of the gallery, the perforator 26 being advanced by the action of the motor 30, and exerting a roto-percussive action by the operation The combination of its rotation motor 33 and striking device 35. The drilling can be done by first using a drill rod, then a rod extension, if the length of the bolt to ask requires.

After the drilling of the hole, the perforator 26 is moved back (that is to say lowered), then the vertical housing 38 is brought in the axis of the drilled hole, for the positioning and the introduction of the bolt, and finally this bolt is depressed in the drilled hole, by translation and rotation control of the drill 26.

The Figures 6 and 7 represent, partially, a second embodiment of the bolting head 7, object of the present invention.

In this second embodiment, the table 8 and the slider 13 of the previous embodiment are replaced by a telescopic support arm 43 of relatively short length. The support arm 43, which extends substantially horizontally, consists of a rear element 44 and an anterior element 45, slidably mounted inside the rear element 44. This rear element 44 is mounted pivoting about a vertical axis 46, on a yoke 47 fixed to the front of the chassis of the carrier vehicle (here not shown). At the front end of the front element 45 of the support arm 43 is mounted a vertical end plate 48 (equivalent to the slide 13 of the first embodiment), which is provided with the vertical guide pads 15, which constitute the guides. vertical sliding of the mobile support 16 of the bolting head 7 (here shown partially).

A lateral jack 49 controls the pivoting of the support arm 43 around the vertical axis 46. Another jack 50, mounted inside the support arm 43, controls the translation displacement of the front element 45 relative to the vertical axis 46. posterior element 44, thus the telescoping of the support arm 43. As already described above, a jack 18 disposed along a vertical axis 19 controls the vertical sliding of the support 16 in the guide pads 15. figure 7 also shows the cylinder 24 which carries the prop down, and the motor 51 which, through an endless chain 52, controls the rotation of the front portion (not shown) of the bolting head 7 orientable around the vertical axis 19.

The foregoing descriptions consider the bolting head 7 in a vertical position of use. However, in a manner not directly illustrated, the bolting head 7 can be made to pivot about a horizontal axis, oriented longitudinally, with respect to the slider 13 (first embodiment) or with respect to the end plate 48 of the arm -support 43 (second embodiment), to "fold" the bolting head 7 and in particular its slide 23, when not in use, to facilitate the movements of the bolting machine.

The following figures 8, 9 and 10 further illustrate other variants of the bolting head object of the present invention.

With particular reference to Figures 8 and 9 , the top bezel 40 of the first embodiment is here replaced by a bezel 53 of the same function, formed by an oblique arm 54 articulated on the beam 21, about a vertical axis 55, located on the side of the bolting head 7, at an intermediate height. The end of the arm 54 carries an opening clamp 56, adapted to be traversed by the drilling tool to ensure its guidance. The pivoting mounting of the arm 54 allows lateral retraction of the telescope 53. Means 57 can furthermore ensure the indexing of the arm 54 in one or more angular positions, in particular the position of use in which the clip 55 is coaxial with the perforator 26. The opening of the clamp 56 allows a lateral introduction and exit of the drilling tool, or a lateral retraction of the bezel 53 without withdrawal of the drilling tool. This opening of the clamp 56 can be performed hydraulically by a device of the "drill bit" type.

• de pré-positionner l'ensemble orientable précité, en choisissant l'une parmi les trois zones de travail : zone centrale, zone latérale droite, zone latérale gauche ;
• de former, par la coopération de la tige de vérin 61 sortie avec les extrémités d'une lumière 59, des butées définissant, pour chaque zone de travail, les positions angulaires extrêmes dudit ensemble orientable, un verrouillage étant réalisable par le vérin 60.

The Figures 8 to 10 also illustrate an alternative to the device constituted by the notches 28, the locking lever 29 and the stops 39 in the first embodiment. The intermediate support 16 here comprises, at its apex, a horizontal plate 58 in which are formed, on the same circle centered on the vertical axis 19, three successive circular arc lights 59, all of the same angular extent, corresponding to the amplitude of the rotation of the assembly constituted by the beam 21, by the slide 23 and the perforator 26, between the drilling position and the insertion position of the bolt placed in the housing 38. A vertical cylinder 60, of which the body is fixed on the side of the beam 21, has a movable rod 61 directed upwards, adapted to be engaged in one of the three lights in a circular arc 59, which allows:

• to pre-position the aforementioned orientable assembly, by choosing one of the three work zones: central zone, right lateral zone, left lateral zone;
• forming, by the cooperation of the cylinder rod 61 extended with the ends of a slot 59, stops defining, for each working area, the extreme angular positions of said orientable assembly, a locking being achievable by the jack 60.

In this context, the figure 8 still shows the receiving toothed wheel 62 on which the endless chain 52 passes, through which this pivotable assembly is pivoted about the vertical axis 19.

Note that, in this latter embodiment, the cylinder 60 may also be remotely controlled, in particular be radio-controlled, which avoids any manual intervention on site, unlike the notched device 28 and locking lever 29 of the first embodiment.

• les détails de forme des composants de la tête de boulonnage ;
• le type et la disposition des divers vérins et moteurs animant cette tête de boulonnage ;
• les caractéristiques du véhicule porteur sur lequel est adaptée ladite tête de boulonnage.

One would not depart from the scope of the invention, as defined in the appended claims, by modifying in particular:

• the shape details of the components of the bolting head;
• the type and arrangement of the various cylinders and motors driving this bolting head;
• the characteristics of the carrier vehicle on which said bolting head is fitted.

In addition, the features described with respect to the various embodiments illustrated in the drawing can be combined in different ways.

Claims (19)

1. A drilling and bolting head for a bolting machine, said head being designed for use in mine galleries of small height and being intended to be mounted on a carrying vehicle, itself of small height, characterized in that said head comprises, in combination:

   - an intermediate support (16) mounted slideably in the vertical direction, at least in the position of use, on an element (13; 48) capable of being connected to one end of the carrying vehicle (1), and, at least in the position of use, defining a vertical axis of rotation (19);

   - a vertical beam (21) which is mounted pivotally along the vertical axis (19) defined by the intermediate support (16) and which is provided with means of vertical guidance (22);

   - a vertically arranged slideway (23) which is mounted slideably on the means of vertical guidance (22) equipping the vertical beam (21) and which is itself provided with means of vertical guidance (25);

   - a drill (26), with means (33, 34, 35) for the drilling and for the fitting of bolts, said drill being mounted slideably on the means of vertical guidance(25) equipping the slideway (23);

   - a horizontal bearing plate (20) which can be used as a mine prop and which is provided in the upper part of the intermediate support (16);

   - for controlling the vertical displacement of the intermediate support (16), a jack (18) arranged vertically along the vertical axis of rotation (19) defined by said support (16);

   - motorized means (30, 32) for controlling the displacement of the slideway (23) in relation to the vertical beam (21) and the displacement of the drill(26) in relation to the slideway (23).
2. The bolting head as claimed in claim 1, characterized in that the intermediate support (16) is mounted slideably in the vertical direction on the slide (13), itself mounted and guided in translational movement on a transversely arranged table (8) provided with means for connecting the latter to one end of the carrying vehicle (1), motorized means (14) being provided for controlling the displacement of the slide (13) along the table (8).
3. The bolting head as claimed in claim 2, characterized in that the means provided for connecting the table (8) to one end of the carrying vehicle (1) are arranged so as to make it possible for this table (8) to be raised and lowered.
4. The bolting head as claimed in claim 3, characterized in that said connection means comprise, on the one hand, fork joints (9) for the articulation of the table (8) about horizontal axes (10) on bases (11) fastened to the end of the carrying vehicle (1) and, on the other hand, at least one jack (12) mounted between the carrying vehicle (1) and said table (8).
5. The bolting head as claimed in any one of claims 2 to 4, characterized in that the means for controlling the displacement of the slide (13) along the table (8) comprise a motor (14) carried by said table (8) and an endless chain transmission connecting the motor (14) to the slide (13).
6. The bolting head as claimed in any one of claims 2 to 5, characterized in that a jack (42) is provided, which is fastened vertically to the slide (13) and which acts as a prop in the downward direction.
7. The bolting head as claimed in claim 1, characterized in that the intermediate support (16) is mounted slideably in the vertical direction on a front part (48) of a telescopic supporting arm (43), the rear element (44) of which is connected pivotally about a vertical axis (46) to one end of the carrying vehicle (1), motorized means (49, 50) being provided for controlling the pivoting of the supporting arm (43) and the telescoping of this supporting arm (43).
8. The bolting head as claimed in any one of claims 2 to 7, characterized in that the intermediate support (16) is mounted pivotally about a horizontal axis with respect to the slide (13) or with respect to the front part (48) of the supporting arm (43), in order to "lay down" the bolting head (7) when the latter is not in use.
9. The bolting head as claimed in any one of claims 1 to 8, characterized in that the slideway (23) is provided with rear vertical guides (24) mounted slideably in guide shoes (15) equipping the vertical beam (21) and is also provided with front vertical guides (25), on which the drill (26) is mounted slideably.
10. The bolting head as claimed in any one of claims 1 to 9, characterized in that the motorized means for controlling the displacement of the slideway (23) in relation to the vertical beam (24) and the displacement of the drill (26) in relation to the slideway (23) comprise a single motor (30) which, in particular, is carried by the vertical beam- (21) and which, by means of at least one chain passing over guide wheels (31), controls the abovementioned displacements.
11. The bolting head as claimed in any one of claims 1 to 10, characterized in that means (27, 28, 29; 58 to 61) are provided for the prepositioning, in a desired angular position or range, of the orientable assembly consisting of the vertical beam (21), of the slideway (23) and of the drill (26) in relation to the intermediate support (16).
12. The bolting head as claimed in claim 11, characterized in that said prepositioning means comprise, on the upper part of the intermediate support (16), a prepositioning quadrant (27) provided with a series of notches (28) and, articulated on the top of the vertical beam (21), a locking lever (29) capable of being introduced into one of the notches (28) of the prepositioning quadrant (27).
13. The bolting head as claimed in claim 12, characterized in that two stops (39) are also provided for the angular positioning of the slideway (23) in the drilling position or in the bolt introduction position.
14. The bolting head as claimed in claim 11, characterized in that said prepositioning means comprise, on the intermediate support (16), a horizontal upper plate (58), in which are formed, on one and the same circle centered on the vertical axis of rotation (19) defined by said support (16), at least two successive slots (59) in the form of an arc of a circle, of angular extent corresponding to the range of rotation of the slideway (23) between the drilling position and the bolt introduction position, while the abovementioned beam (21) has mounted on it a vertical jack (60), of which the moveable element (61) directed upward, is capable of being engaged selectively into one of the slots (59) in the form of an arc of a circle.
15. The bolting head as claimed in any one of claims 1 to 14, characterized in that the abovementioned beam (21) carries a guide or "steady rest" (40; 53) for the drilling tool.
16. The bolting head as claimed in claim 15,
    characterized in that the steady rest (53) is formed by an oblique arm (54) articulated on the beam (21) about a vertical axis located on one side of the bolting head (7), at an intermediate height of the latter, the end of the arm (54) carrying an opening gripper (56) capable of having the drilling tool passing through it in order to ensure the guidance of the latter.
17. The bolting head as claimed in any one of claims 1 to 16, characterized in that the drill (26) is mounted on a support (37) which also carries laterally a vertical receptacle (38) for the positioning and introduction of a bolt, said receptacle (38) and the drilling line of the drill (26) being located on one and the same circle centered on the abovementioned vertical axis (19).
18. The bolting head as claimed in any one of claims 1 to 7, characterized in that a plate (36) is provided for protecting the rear part of the drill (26), said plate being carried by the lower part of the slideway (23
19. 19. The bolting head as claimed in any one of claims 1 to 18, characterized in that its motorized translational and rotational movements are radio-controlled movements.

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