CN2282967Y - Pneumatic percussive mechanism with locking valve - Google Patents

Abstract

The utility model relates to a pneumatic impact mechanism. The side face of a plunger cylinder of a control valve is provided with a locking valve for locking or releasing a plunger. The locking valve is composed of a wedge-shaped sliding lock tongue with a piston, a cylinder chamber, and return springs. A radical air channel which is positioned inside an impact piston and is communicated with air source is connected to a cylinder chamber positioned on the lower part of the piston of the locking valve via a valve pushing air channel of the locking valve for pushing a locking piston toward the upper side and releasing a plunger valve. The utility model has the advantages of stable pressure, stable position, and reliable motion; air pressure acting on both sides of a two-bit plunger valve is directly supplied via the air source. When the plunger reaches the proper position, the plunger is fixed via the air pressure of the locking valve or the generally-pushing valve. The disadvantage that the action of the plunger is unstable in an original structure can be thoroughly avoided.

Description

The gas impact machine of band lock-up valve

The utility model relates to gas impact machine, the reciprocating type pneumatic drilling machine in particularly a kind of mine.

The inventor discloses a kind of gas impact machine in patent CN90220630, comprise cylinder body, piston and plunger control valve etc.This cylinder body front and back ends all has the inlet and outlet passage, and piston has former and later two distribution bars, and the set a distance gas supply mechanism is respectively arranged on it, preceding distribution bar is simultaneously as impact bar, in the back distribution bar axial air flue is arranged, the radially air flue in piston and the aperture of cylinder body wall with before, back chamber pushes away the valve air flue and communicates.Two slide-valve plungers in the control valve are by the keying of twice cannelure control stroke and backhaul air flue.When the air feed of chamber, back, the cup exhaust; During the cup air feed, the exhaust of back chamber constantly hockets, and entire cylinder is in the continuous exhaust pneumatic wallop state.The back pressure of piston is all the time near atmospheric pressure like this, and calming the anger of work done may be expanded near atmospheric pressure in the cylinder, and the energy of calming the anger is fully used, and can reduce noise greatly.Though the many-sided advantage of said mechanism tool, but still have weak point, be that mainly the plunger both ends of the surface of control valve are communicated with the forward and backward chamber of cylinder respectively, be subject to the wherein interference of complicated factors such as eddy current, vacuum, shock wave, make the position instability of plunger, and then influence the reliability of entire mechanism work.

The purpose of this utility model is thoroughly to avoid above-mentioned difficulties, and provide a kind of improved gas impact machine, utilize the power of stable pressurized air source as plunger, plunger can accurately be put in place, and locked immediately, be not subjected to the influence of the forward and backward indoor complicated air pressure situation of cylinder, thereby improve the reliability of whole gas impact machine work, make its low power consuming low noise two big advantages be able to abundant realization.

Solution of the present utility model comprises cylinder body, piston, the forward and backward distribution bar of piston, wherein before the distribution bar simultaneously as impact bar, in back distribution bar and the piston axial admission road is arranged, the radially air flue in piston can with push away the valve air flue and communicate; The cylinder body front end has stroke exhaust duct and backhaul air intake duct, and rear end of the cylinder block has stroke air intake duct and backhaul exhaust duct; Backhaul and stroke air intake duct form the set a distance air feed with the cannelure of two distribution bars respectively; Two plungers are arranged, to open and close the intake and exhaust channel of stroke, backhaul in the plunger case of control valve; Can the cushion gas khiva respectively be arranged relative to the forward and backward air cushion lid back that cylinder body moves; It is characterized in that:

1) respectively there is big neck at the plunger two ends of control valve and crosses compression, form the plunger valve chamber between the two big necks, communicate with atmosphere through the secondary steam vent; Plunger right-hand member chamber communicates with calming the anger, and the plunger its right end face is applied often push away valve air pressure; Chamber, a plunger left side can communicate with the radially air flue in the piston through pushing away the valve air flue, and the annular end face of the big neck in plunger left side is applied air pressure, and the annular end face area of big neck is greater than plunger its right end face area; Each venting aperture on the big neck of plunger of the left and right chamber of plunger communicates with plunger valve chamber and atmosphere;

2) being provided with one in the plunger case side can be with plunger locking or the lock-up valve that discharges, and this lock-up valve is made up of wedge shape slip dead bolt, cylinder chamber and the back-moving spring of band piston, and the venting aperture is arranged on its piston;

3) the radially air flue that is communicated with pressurized air source in the piston can push away the cylinder chamber that the valve air flue feeds lock-up valve piston bottom through lock-up valve, so that dead bolt is upwards boosted, discharges plunger valve.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.

Fig. 1 is the longitudinal sectional drawing of the gas impact machine of band lock-up valve, and piston is in the state that backhaul begins.

Fig. 2 is that this mechanism is in the state that stroke begins.

Fig. 3 is the structural representation of plunger

Fig. 4 is the dead bolt structural representation of lock-up valve.

Referring to Fig. 1, Fig. 2, piston 2 in cylinder body 1 has former and later two distribution bars 3,4, wherein preceding 3 whiles of distribution bar are as axial admission road 41 is arranged in the distribution bar 4 behind the impact bar, link to each other with the radially air flue 42,46 in the piston, can be respectively in the piston motion process with casing wall in plunger valve push away valve air flue 43 and lock-up valve and push away valve air flue 44 and communicate.Air intake duct 41 and air flue 38,39 all communicate with source of the gas.Chamber 29 is provided with stroke air intake duct 12 and backhaul exhaust duct 60 behind the cylinder, and cylinder cup 28 is provided with backhaul air intake duct 11 and stroke exhaust duct 59.Exhaust duct 59,60 is communicated with ambient atmosphere by plunger valve chamber 53 and secondary steam vent 67.The forward and backward distribution bar of piston has set a distance air feed annular groove 15,16, and calming the anger during respectively through air intake duct 11,12 when it can enter cylinder and promote piston 2 motions, as Fig. 1 right side, shown in Fig. 2 left side.When the big neck distribution face of cylinder 17,18 through out-of-date this air inlet of then closing, stop air feed, thereby form the set a distance air feed.The set a distance air feed can be designed as required by the decision of annular groove width

Cylinder body 1 front and back ends is provided with the forward and backward air cushion lid 6,7 of annular, and the enclosed volume between the forward and backward lid 19,49 of cylinder constitutes forward and backward air chamber 30,31.Air chamber can be communicated with pressurized air source, and when back air cushion lid was subjected to piston impact, air chamber 30 can play buffer protection function, and the kinetic energy of backward stroke of the piston can be converted into stroke kinetic energy

Slide-valve plunger shown in Figure 3 has annular groove 68,69 and big neck 65,66, annular groove section and big cervical part of esophagus and plunger case slipper seal in the cylinder both sides.Plunger is by the two ends pressure differential, to open and close aforesaid each inlet and outlet passage.

Fig. 4 is the slip dead bolt 81 of the band piston of lock-up valve, and lozenges 84 is arranged at its top.Venting aperture 86 is arranged on the piston.

The following describes working process of mechanism, Fig. 1 is that piston is in the position that end of stroke, backhaul begin.Push away the cylinder chamber 85 that valve air flue 44 enters lock-up valve 80 by calming the anger of entering of air intake duct 41 in the distribution bar of back through radially air flue 46, the lock-up valve of piston, overcome spring force promotion piston and whole slip dead bolt 81 upwards, the constraint of valve to the big neck 65 of plunger unlocks, plunger promotes to be displaced downwardly to left end at the valve air pressure that often pushes away of right-hand member chamber 61, as Fig. 1, its cannelure 68 is connected backhaul air intake duct 11, and big neck 66 is opened backhaul steam vent 60, and stroke steam vent 59 and 12 sealings of stroke air intake duct.Calming the anger enters the cylinder cup through annular groove 15 and makes the set a distance air feed, to the isobaric work done of piston, promotes piston and makes drawback movement left.Waste gas in the back chamber 29 enters plunger valve chamber 53 through backhaul steam vent 60 and does reexpansion, enters atmosphere by secondary steam vent 67 at last.During air cushion covers before backward stroke of the piston moves to big neck 17 sealing of impact bar 3 backhaul air intake duct 11, intake process stops, and has entered quantitatively the calming the anger to the piston expansion working of cup, and piston kinetic energy continues to increase.When calming the anger of cup is expanded to atmospheric pressure, when the energy of calming the anger has been fully used, backhaul ends, the radially air flue 42 of piston 2 front ends pushes away valve air flue 43 with the plunger valve in the cylinder body and connects, calm the anger and enter chamber 62, a plunger valve left side and push away valve to the right, the annular end face area of the big neck 66 of cause is greater than plunger right side narrow neck end face area, so plunger is subjected to the right air pressure often to push away valve air pressure greater than the right side, plunger is moved right, big neck 65 slips over dead bolt 81 wedge surfaces, dead bolt moves downward under spring 82 promotes and blocks big neck 65 left sides, and plunger valve is locked in position shown in Figure 2, and stroke begins.This moment, the stroke of plunger left end was crossed compression 69 with source of the gas and the connection of stroke air intake duct, and the chamber 29 after cannelure 16 enters cylinder of calming the anger promotes piston and makes stroke movement (to the right).The big neck 65 of plunger right-hand member is opened stroke steam vent 59 simultaneously, and backhaul steam vent 60 and 11 sealings of backhaul air intake duct.Waste gas behind the cup expansion working enters plunger valve chamber 53 through stroke exhaust duct 59, and reexpansion is after secondary steam vent 67 enters atmosphere.The back pressure of piston stroke is all the time near atmospheric pressure.When stroke air intake duct 12 had been sealed on the big neck face of cylinder 18 of back distribution bar, the air inlet of back chamber stopped.The chamber quantitatively calms the anger to the piston expansion working after entering.Run to the position of closed grate hole until piston, impact energy reaches maximum and hits the bit shank work done.Piston comes back to the position of Fig. 1, and a circulation finishes, and second backhaul begins.Plunger valve locked valve secure fixation when stroke like this, thus cup continuous exhaust pneumatic wallop and other gas circuit operate as normal in whole stroke guaranteed.

Have aperture 63,64 on two big necks of plunger, the left and right chamber of plunger can be communicated with plunger valve chamber 53 and atmosphere through aperture.When moving, valve can avoid taking place vacuum or air cushion resistance phenomenon.Have aperture 86 on the piston of lock-up valve, lock-up valve covers and also has the aperture 88 that leads to atmosphere, and these apertures play a part slowly to lose heart.Promptly release after pushing away valve events calming the anger to finish, lock-up valve can be resetted under spring 82 effects immediately from aperture.Also have air vent 89 at the plunger case low order end in addition.

The gas impact machine of band lock-up valve, its advantage is that the air pressure that acts on two plunger valve both sides directly provides by source of the gas, it is only relevant with piston position, and irrelevant with chamber, cylinder body front and back air pressure, pressure stability, reliable in action.After in case plunger puts in place immediately by lock-up valve or often push away valve air pressure and fixed.Thoroughly avoided being communicated with chamber before and after the cylinder respectively because of the plunger two ends in the original structure interference of factors such as being subjected to eddy current, vacuum, shock wave.Can guarantee fully that former pneumatic beater mechanism low power consuming, low noise two big advantages are achieved.

Claims (1)

1, the gas impact machine of band lock-up valve, comprise cylinder body (1), piston (2), the forward and backward distribution bar of piston (3), (4), wherein preceding distribution bar (3) is simultaneously as impact bar, in back distribution bar (4) and the piston (2) axial admission road (41) is arranged, radially air flue (42) in piston can with push away valve air flue (43) and communicate, the cylinder body front end has stroke exhaust duct (59) and backhaul air intake duct (11), and rear end of the cylinder block has stroke air intake duct (12) and backhaul exhaust duct (60); Backhaul and stroke air intake duct (11), (12) form the set a distance air feed with the cannelure (15) of distribution bar (3), (4), (16) respectively; One two plungers (5) are arranged, to open and close the intake and exhaust channel of stroke, backhaul in the plunger case of control valve (52); Can cushion gas khiva (30), (31) be arranged relative to forward and backward air cushion lid (6), (7) back that cylinder body moves; It is characterized in that:

1) respectively there are big neck (65), (66) in the plunger of control valve (5) two ends and cross compression (68), (69), form plunger valve chamber (53) between the two big necks, communicate with atmosphere through secondary steam vent (67); Plunger right-hand member chamber (61) communicates with calm the anger (39), the plunger its right end face is applied often push away valve air pressure; Chamber, a plunger left side (62) can communicate with the radially air flue (42) in the piston through pushing away valve air flue (43), and the annular end face of the big neck (66) in plunger left side is applied air pressure, and the annular end face area of big neck (66) is greater than plunger its right end face area; Each venting aperture (63), (64) on the big neck of plunger, the left and right chamber of plunger communicate with plunger valve chamber (53) and atmosphere;

2) being provided with one in plunger case (52) side can be with plunger locking or the lock-up valve (80) that discharges, and this lock-up valve is made up of wedge shape slip dead bolt (81), cylinder chamber (85) and the back-moving spring (82) of band piston, and venting aperture (85) is arranged on its piston;

3) the radially air flue (46) that is communicated with pressurized air source in the piston (2) can push away the cylinder chamber (85) that valve air flue (44) feeds lock-up valve piston bottom through lock-up valve, so that dead bolt (81) is upwards boosted, discharges plunger valve.

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