EP1753931B1

EP1753931B1 - Pneumatic perforator

Info

Publication number: EP1753931B1
Application number: EP04816703A
Authority: EP
Inventors: Paul Mateescu
Original assignee: Sc Ramira Sa
Current assignee: Sc Ramira Sa
Priority date: 2004-06-07
Filing date: 2004-09-09
Publication date: 2008-07-09
Anticipated expiration: 2024-09-09
Also published as: RO122220B1; DE602004014996D1; WO2005121492A1; EP1753931A1; ATE400725T1

Abstract

The invention is referring to a pneumatic perforator for drilling in mining industry having a head cylinder including the admission valve of the compressed air and the water washing installation for the perforated hole washing, characterized by that the perforator is provided by a quick change of the rotation speed device (B) which's line grooved bushing (8) placed in a gear's hub (9) is driving an pipe shaft (16) provided by idlers (17, 18, 19) geared by the steering wheels (22, 23, 24) fixed on the rotation bushing (25) in which is pressed the drill-bushing (30); its rotation speed is selected by a mobile peen (31) assembled in the rod (32).

Description

The invention is referring to pneumatic drilling machine; build for rocks perforation in the mining industry. The documents US 2,331,179 and US 1,642,949 disclose drilling machines of this type.
Are known pneumatic drilling machines with dependent rotation of the drill equipped with a distribution valve and being provided with spare parts allowing the modification of the rotation angle of the drill's cutting edge between two successive punches, this angle is depending on the rock's hardness and influence the drilling speed.
A disadvantage of this type of drilling machines is the necessity of dismantling and assembling the drilling machine for setting up the spare parts to ensure the optimal revolution force's moment of the driller.
When the rock's hardness frequently shows variations, this assembling operation mentioned before, shall be repeated often because this operation is required to be made not in the drilling area but in the special equipped workshops, what could be considered as a disadvantage.
The problem solved by the invention is to realize a pneumatic drilling machine having the option of getting many revolution speeds of the drill with the possibility to get quickly the change of revolution speed of the drill.
The pneumatic drilling machine, as per the invention is eliminating the disadvantage of other known solutions and solve the problem by that the device for quick change of the driller's revolution speed is placed in the front place of the drilling machine, in the constitution of this device is mentioned the right (longitudinal) grooved bushing known itself, placed on the piston's rod and assembled in the hub of a gear which by another gear is driving a pipe shaft (parallel to the pistons rod and placed on top of it) on this shaft is assembled a no. of idlers in stages, being geared to an identical no. of steering wheels fixed on the rotation bushing what is gearing the drill's bushing;
The idlers from the pipe shaft could be fixed for a common action with this one, by a mobile peen, sliding (from the pipe shaft), which can be moved axial by manual action of a rod; it is realizing so many different revolution speeds of the drill bushing, as many idlers are on the pipe shaft.
The pneumatic drilling machine as per the invention shows the following advantages:

The change of the revolution speed for the drill is quick and easy by driving through a rod (without being necessary the assembling and dismantling the drilling machine) being possible to establish the revolution and the turning force's moment corresponding to the hardness of the rock, even than the rock's hardness is having frequently variations (or are observed fissured rock zones), fact what is determining the increase of drilling speed ;
Building solution for the quick change of the revolution speed device can be applied to the slight and medium punching drilling machines (supported by telescopic columns) but also to the percussive hard drilling machines (supported by mechanical arms or on the rotating frame) in this case not being necessary the use of pneumatic rotation motors for drill's bushing rotation, realizing by this a compressed air economy (by using only for percussion the compressed air).

It is given on an example of realizing the invention related to the figure 1, presenting:

Fig.1 Longitudinal section through the device for quick change of the drilling revolution speed.

The pneumatic driller for rock perforation in mining industry, as per the invention is having a piston 1 (partial represented), having a linear and helical grooved rod, known itself; through the piston1 is passing (coaxial) the water pipe 2 included in the water washing system of the perforated hole; the piston's rod 1 is guided by the guiding bushing 3; partial represented (foreseen in the front side with an external collar); guiding bushing 3 is pressed in the cover's - front side 4 (partial represented) of the cylinder (not represented) in which is working the piston 1; on the piston's rod 1 in the front cylinder 5, is placed the rotation device with clickers A, known itself, in which is the clicked wheel 6 containing assembled the driving bushing 7 provided with helical grooves; the quick change of revolution speed device B (through what are reached many revolution speeds of the drillers), is placed in the front side of the drilling machine, in the content of this device is also mentioned the grooved bushing 8 with longitudinal lining grooves known itself, placed on the piston's rod and assembled by threading in the hub of a gear 9 provided by a bearing with needle bushing 10 and 11 (assembled in the front head cylinder 5) separated one to the other by a spacing bar 12; between the hub of the gear 9 and the clicked-wheel 6 is placed the pressure washer 13; the gear 9 is driving by a gear 14 and a peen 15, a pipe shaft 16, parallel to the piston's rod 1 and positioned on the top of it; the pipe shaft 16 is provided on an area of it's length with a longitudinal peen channel bored a; on the pipe shaft 16 are also assembled the idlers in multi-stage 17,18,19, (different as no. of toots); between the idlers 17 and 18 is fixed the distance- maintaining washer 20 and between the idlers 18. and 19 is fixed the distance-maintaining washer 21; Idlers 17,18 ,19 are drive by an identical no. of steering wheels 22, 23, 24 assembled tight (by peens or grooves) on the rotation bushing 25 provided with an external journal bearing on the length of needle bushings 26 and 27, separated between by a spacing 28; between rotation bushing 25 and the gear's hub 9 there is a pressure washer (or an axial needle bearing) 29 having frontal evolving (un-positioned); bushing 25 on it is pressed the drill-bushing 30; the idlers 17,18,19 from the pipe shaft 16, could be fixed one by one on this shaft by a mobile glide peen 31, bored to an extremity and provided by an plane milled area b, to the respective extremity; the mobile peen 31 is placed in the bored longitudinal channel c of a rod 32, what is assembled in the internal side of the pipe shaft 16, the working extremity of the mobile peen 31 passing through the longitudinal bored peen channel a of the pipe shaft 16; the mobile peen 31 is pending around a bolt 33 from the rod 32; on the plan milled end b of the mobile peen 31 (near by the bolt 33) is stepping the frontal side of a pushing device 34 pressed by a pressure spring 35, load stressed by the special screw 36 (designed with a big nail round head) assembled in the rod 32; tightness between the rod 32 and the pipe shaft 16 is made by a rubber gasket ring 37; pipe shaft 16 is provided on one of its extremities by a bearing 38, placed in the casing 39 (of the device B), this one being geared to the front head cylinder 5; to the other extremity of it the pipe shaft 16 is provided to a bearing 40, placed in the cover 41 having an axial ream by what is passing an extremity of the pipe shaft 16 and the rod 32; the cover 41 is plane milled d in the assembling area to the front head cylinder 5; the cover 41 is fixed in the cover 39 by screws (not represented); to prevent the dust penetration into the needle bushing 26 and 27 is provided an seal collar 42 made by felt, placed in a cover 43; air -tight set composed by elements 42 and 43 is replacing periodically (complete); the extracting jaw (not represented) is attached to the cover 39 by the bolt 44, the pushing device 45 and the rubber 46; during the withdrawal course of the piston 1, the grooved bushing 8 ( being part of the quick change of rotation speed device B) is rotated to the piston's rod 1, rotating the gear 9 too ( on what is assembled); the gear 9 is driving the gear 14 and the pipe shaft 16; one of the idlers 17,18,19, is strengthen by the mobile peen 31 to the pipe shaft 16; the respective wheel, will be drive in gearing to the shaft 16, driving at its turn in rotation the fixed gear what is gearing one of the fixed gears 22,23,24, placed on the rotation bushing 25 what is rotating the drilling -bushing 30; by axial displacement of a rod 32 ( by action on the screw's head 36) the position of the mobile peen 31 is changing, ensuring the strength to the pipe shaft 16 of different idlers placed on it (17,18,19 from the shaft 16); resulting at the end different rotation speed of the rotation bushing 25, implicit of the drill-bushing 30, for a single value of rotation speed of the grooved bushing 8; the driller is having so many rotation speeds as no. of idlers placed on the pipe shaft 16; rotation speed change is made, in principle, after the admission valve of the driller has been settled in position <slow functioning > and after changing the rotation speed the admission valve is settled in position <normal functioning>.

Claims

Pneumatic perforator machine tor rocks perforation in tne mining industry having a head cylinder, provided with an admission valve of compressed air and a water washing installation of the bored hole, cylinder, front side cover a rotation device with clickers provided with a driving helical grooved bushing assembled to a clicked wheel, characterized by that it has a quick change of the rotation speed device (B) by which they may be obtained many rotation speed of the drill said device being placed in the front side of the perforator and containing also the longitudinal grooved bushing (8) known per se, placed on the rod of the piston (1) and assembled by threading in the hub of gear (9) bearing to the needle bushing (10) and (11) assembled in the front head cylinder (5) separated one of the other by a distance bar (12); between the hub of gear (9) and the clicked wheel is placed the pressure washer(13); the gear (9) drives by means of gear (14) and the cotter (15), a pipe shaft (16) parallel to the rod of piston (1) and placed above it; the pipe shaft (16) is provided , on a portion of lts length, with a cotter longitudinal bored channel (a); free idlers (17,18,19) with different number of teeth in stages are also mounted on the pipe shaft (16); between the idlers (17) and (18) there is placed another distance washer (20) and between the idlers (18) and (19) there is placed the distance washer (21) ; the idlers (17,18,19) are in gearing to an identical number of gear (22,23,24), fixed by cotters or grooves on the rotation bushing (25) with external bearing on the needle bushing (26) and (27), separated therebetween by a distance bar (28); between the rotation bushing (25) and the hub of the gear (9) there is a pressure washer (29) having a frontal recesses, un-positioned, or a needle axial bearing; to the front side, within the rotation bushing (25) it is pressed the drill-bushing (30); the idlers (17,18,19) from the pipe shaft (16) could be jointed one by one to the pipe shaft (16) by a glide mobile cotter (31) bored to the end and provided with a plane milled zone (b) at the respective extremity; the mobile cotter (31) is placed in the bored longitudinal channel (c) of a rod (32) that is assembled within the pipe shaft (16), the working extremity of mobile cotter (31) passing through the cotter longitudinal channel, bored (a) of the pipe shaft (16); the mobile cotter (31) is oscillating around a bolt (33) from the rod (32); on the plane milled extremity (b) of the mobile cotter (31) is stepping the front side of pushing device (34) keep pressed by a compression spring (35) strained by the special screw (36) assembled in the rod (32); tighten between the rod (32) and the pipe shaft (16) is provided by the rubber o-ring (37); the pipe shaft (16) is borne to an extremity by the bearing (38) placed within housing (39) coupled with the head cylinder (5); the pipe shaft (16) is borne to its other extremity by a bearing (40) located in the cover (41) and having an axial ream through which are passing an extremity of the pipe shaft (16) and the rod (32); in the assembling zone with the front head cylinder (5) the cover (41) have a plane milled zone (d); the cover (41) is fixed in the housing (39) by screws; for preventing the air impurities penetration to the needle bushing (26) and (27) it is used a fett o-ring (42) for air-tightening and placed in a housing (43); the pneumatic perforator having so many rotation speeds as many as idlers are on the pipe shaft (16).