Device having a filter, a filter vibrating means and a scraper used for sucking off drillings

A device for sucking off drillings during the drilling of boreholes, comprising a suction fan (9) and a filter (10) as well as an opening closeable by a lid for emptying the drillings reception space (8) preceding the filter (10), in which, for the simple cleaning of the filter (10), the lid (12) is connected with a vibrating mechanism for the filter (10).

BACKGROUND OF THE INVENTION
 1. Field of the Invention
 A device for sucking off drillings during the drilling of boreholes,
 comprising a suction fan and a filter as well as an opening closeable by a
 lid for emptying the drillings reception space preceding the filter.
 2. Prior Art
 When drilling boreholes for the purpose of setting roof bolts in order to
 stabilize the rock it is known to scour the drillings forming either by
 aid of liquids, such as water, under pressure or to effect removal via
 suction by hauling the drillings through the drill rod without scouring
 agent so as to get them into a suction device via a suction channel. Known
 suction devices of that type comprise a drillings reception chamber or
 reception space, into which the suction channel opens. To that reception
 space is connected a suction fan with a filter being interposed. The
 purified air, as a rule, is blown out in the direction towards the mine
 face. After termination of the drilling phase, both the driving motor and
 the suction fan may be set out of operation, wherein the drillings
 collected in the reception space may be discharged by opening the lid. In
 doing so, the drillings usually get on the floor.
 Those known suction fan arrangements involve the drawback that thorough
 cleaning of the collection vessel in most cases is feasible only to an
 insufficient degree and that, above all, the filters are not cleaned. With
 the filters being rendered more and more impure, the suction performance
 will decrease, which might affect the performance of the drilling device.
 SUMMARY OF THE INVENTION
 The invention aims at providing a device of the initially defined kind by
 which it is feasible in a simple manner to effectively clean the filter of
 the suction device, thereby avoiding a decrease of the suction
 performance. Furthermore, the invention aims to further develop a device
 of the initially defined kind so as to enable enhanced clearance and
 enhanced discharging of the drillings from the reception space or
 reception chamber.
 To solve this object, the invention, departing from a device of the
 initially defined kind, essentially consists in that the lid is connected
 with a filter vibrating means. Such a vibrating means may be of a
 relatively simple configuration, it merely being required to appropriately
 couple the vibrating means with the lid and, in particular, with the
 pivotal movement of the lid. Thus, after having stopped the suction motor
 and opened the lid, vibration and hence cleaning of the filter are
 effected simultaneously, wherein the material thrown off the filter
 surfaces by vibration can be discharged through the closeable opening
 opened via the lid.
 In a particularly simple manner, the configuration according to the
 invention is devised such that the lid is designed as a bottom flap and to
 the lid is hinged a vibrating rod or ratchet which cooperates with a
 ratchet or vibrating rod engaging at the filter. Such a simple mechanical
 device in which, for instance, a toothed rack may be connected with the
 lid as the vibrating rod at every opening of the bottom flap will cause a
 vibrating movement of the filter as a function of the engagement of the
 ratchet in the vibrating rod, thereby throwing off material adhering to
 the filter surfaces.
 In order to be able to reliably exert said vibrating movement on any
 standard filters without modification of the filters, the configuration
 advantageously is devised such that a comb-like engagement part for the
 pockets of a pocket filter is connected with at least one spring band
 reaching into the reception space and that the spring band carries at
 least one projection or conical pin cooperating with a vibrating rod
 formed by a toothed rack, and that the vibrating rod is articulately
 hinged to the pivotable lid. Such a comb-like configuration of the
 engagement part may be brought into engagement with standard pocket
 filters as are common in suction devices and, in this manner, the
 vibrating movement is safely transmitted onto the filter without requiring
 modifications at the filter itself. The vibrating movement is imparted by
 means of a spring band each in ratched-like engagement with a vibrating
 rod or toothed rack, said vibrating movement being induced by the
 projections reaching into the teeth of the toothed rack or vibrating rod
 and causing the spring band to be bent and the bent spring band to
 accordingly snap back upon entry into the consecutive tooth space.
 In order to ensure simple coupling of the vibrating rod with the lid, the
 configuration advantageously is devised such that the vibrating rod is
 hinged to the lid at a distance from the pivot axis of the lid and is
 pivotably guided within the reception space.
 In order to further enhance the discharging of drillings from the reception
 chamber or reception space and be able to safely remove deposits from the
 walls of the reception space, the configuration advantageously is devised
 such that at least one scraper is connected with the lid for scraping
 material off bottoms or side walls of the reception space, particularly
 during closing of the lid. The scraper may be designed in the manner of a
 rake and may be pressed, in particular resiliently, against the wall of
 the reception space and, in particular, a bottom wall of the same.
 According to a preferred further development of the device according to the
 invention, the scraper itself is articulately connected with the pivotable
 lid so as to be able to follow, in particular inclinedly arranged, side
 walls of the reception space while maintaining a scraping contact during
 opening of the lid.
 Fixation of the comb-like reception part for the pocket filter
 advantageously is realized in a manner that the comblike engagement part
 via at least one spring band is fixed to a housing including a guide part
 for the vibrating rod.
 An appropriate negative pressure prevails within the reception space during
 the suction operation, and in order to be able to ensure safe sucking off
 the lid must be closed in an accordingly tight manner during the suction
 operation. In order to enable the opening of the lid and hence the
 discharging of the drillings, the configuration advantageously is devised
 such that the lid is connected with a pivot drive capable of being locked
 in its closing position with the fan motor running.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
 In FIG. 1, a roof bolt drilling and setting device is denoted by 1. After
 insertion of a drill rod in the respective bearing spaces 2, the drill rod
 can be displaced towards the roof in the direction of arrow 3, the
 drilling motor being schematically indicated by 4. In the side view, the
 cutting head 5 of a cutting means 6 is schematically apparent, wherein the
 roof bolt drilling and setting device usually is to set roof bolts near
 the mine face that is being operated by the cutting tools or cutting head
 5.
 With the roof bolt drilling and setting device 1, the drillings are sucked
 into a suction space 8 constituting the reception space, via a suction
 hose 7. The drilling fan is schematically indicated by the motor 9, a
 filter 10 being interposed between the suction space 8 and the suction fan
 9. The filtered and purified air is blown out in the direction towards the
 mine face via an outlet opening 11. The suction space 8 or reception space
 comprises a pivotable lid 12 whose pivot drive is denoted by 13. By
 opening the pivotable lid 12, the drillings collected in the reception
 space 8 get on the floor 14 and are discharged in that manner.
 In the configuration according to the invention as represented in FIG. 2,
 the lid 12 is illustrated in the closed position and may be pivoted into
 the broken-line position 12' by the pivot drive 13. The pivot drive 13 is
 designed as a hydraulic cylinder piston unit engaging at a bearing eye of
 the lid, the lid 12 during opening being pivoted into position 12' about
 the pivot axis 15.
 A toothed rack 16 is hinged to the lid via an articulation 17. Furthermore,
 a scraper 18 is hinged to the lid so as to be pivotable about an axis 19,
 wherein the axis 19 may be connected with a spring maintaining the scraper
 18 each in contact with the side wall 20 of the reception or suction space
 8.
 The filter 10 is designed as a removable pocket filter capable of being
 changed upon folding off of the upper housing part 21, to which the
 suction fan is connected.
 Pivoting of the lid 12 into the position 12' causes the vibrating rod to be
 displaced in the sense of arrow 22. During that displacement of the
 vibrating rod in the sense of arrow 22 as well as during the displacement
 back during closing of the lid 12 opposite to the direction of arrow 22, a
 vibrating movement is exerted on the filter 10 as will be elucidated by
 way of FIG. 3.
 From FIG. 3 the vibrating rod 16 designed as a toothed rack is apparent.
 The filter 10 is designed as a pocket filter, meshing by means of a
 comb-like engagement part 23 which, in turn, is fixed to the housing 26 of
 the reception space 8 via spring bands 24 and 25. Screws 27 serve
 fixation.
 At least one of these spring bands carries a conical projection 28 meshing
 with the toothed rack 16. By pivoting the lid 12, the pin 29 of the
 articulation 17 entrains the toothed rack 16 in the sense of arrow 22,
 thus causing the projection 28 to jump from one of the tooth spaces to the
 consecutive tooth space while bending the resilient band 25. By such a
 bending of the spring band 25 and the subsequent immersion into the
 consecutive tooth space of the toothed rack 16, a vibrating movement is
 exerted on the comb-like engagement part 23 and hence on the filter 10
 such that material adhering to the external side of the filter 10 gets
 towards the lid, which allows discharging of the material in its opened
 position.
 In regard to the pivotal movement of the toothed rack 16 during pivoting of
 the lid 12, an appropriate guide with play must be provided, the guide
 part for the toothed rack being denoted by 30 in FIG. 3.
 In FIG. 4, this guide part 30 is illustrated on an enlarged scale. The
 guide part 30 embraces the toothed rack 16 with play such that slight
 lateral pivotal movements can be taken into account.
 Each opening of the bottom flap 12 as well as its subsequent closing, thus,
 causes a vibration of the filter with the respective cleaning of the
 bottom surface by the scraper 18 being effected at the same time. In doing
 so, a particular advantage of the configuration according to the invention
 consists in that it may be readily installed in existing devices and no
 separate actuating means are required for the vibrating movement, since
 the vibrating comb is directly coupled with the pivotal movement of the
 bottom flap.