Pneumatic hammer with throttle air control valve

FIELD: process engineering.

SUBSTANCE: invention relates to percussion machine to break rocks and frozen soils. Proposed hammer comprises circuit chamber, hollow cylinder to house striker with central channel separating cylinder chamber into idle and working stroke chambers, central tube, extra tube with end closed on the side of idle stroke chamber, and working tool. Central tube extends through central channel of striker to communicate circuit chamber with idle stroke chamber. Said extra tube is arranged coaxially with annular clearance inside said central tube to communicate circuit chamber with idle stroke chamber. Cover has central trough bore for central tube to extend there through. Said cover is fitted on hollow cylinder end on the side of idle stroke chamber. Side surfaces of central tube and cover central trough bore make throttling channel to communicate circuit chamber with working stroke chamber. Hollow cylinder sidewall has radial discharge channel. Radial channel is made in central tube on the side of working stroke chamber. Distance between the most distant edges of radial discharge channel and radial channel of central tube does not exceed the length generating line of striker.

EFFECT: reliable starting and operation.

2 dwg

 

The invention relates to the field of construction and mining machines impact and can be used to create manual pneumatic hammers for engineering and heavy hammer to fracture rock and frozen ground.

Known pneumatic percussion with butterfly distribution (patent RF №2361724, CL E25D 9/04, AS 37/24, 2009), comprising a housing with a radial outlet channel and the Central channel, supported uplatnena at the end of the body cover with an annular flange and a Central hole, a drummer with an axial through-channel that separates the Central channel of the body on camera working and idle strokes, a pipe with a blind flange on the cap side, the longitudinal and radial channels installed coaxially in the Central channel of the body and placed in axial end-to-end channel drummer and the Central hole of the cover to form between the tube and cover the annular channel with the possibility of overlapping his blind flange tube, the tube is coaxially installed additional tube with radial channels to form between them an annular gap in the form of a channel displacement, while the distance between the outermost edges of the radial outlet channel and a radial channel for more tubes located side to the measures idling, and between the outermost edges of the radial outlet channel and a radial channel for more tube located on the side of the camera work moves more length forming a drummer, a Cup mounted uplatnena relative to the annular flange of the cover and housing to education between the side surfaces of the glass and the housing annular accumulation chamber constantly in communication with the chamber stroke radial bypass channel housing, a chamber formed in the annular flange of the cover and the glass vozduhoprovodyaschih channel, constantly informing the chamber of a network of compressed air through the air-conducting sleeve and the nipple, Rethimno United with glass, vozduhoobmenu ring with outlet holes, the camera release, formed between housing and vozduhoobmenu ring, a working tool having a shank, a collar mounted with the opportunity to interact with the drummer and with the end of the body by the above-mentioned flange, a cap with o-ring shock absorber holding a working tool from falling out of the Central channel of the body, the shank of the working tool has a Central blind hole, in which, based on his bottom posted by tube to form between its lateral surface and a side surface muffled what about the holes in the shank annular channel, the flow area is not less than the flow area of the longitudinal channel of the tube.

The main disadvantage of technical solutions: channel displacement from the camera's side of the stroke determines after the opening of the firing channel from the camera idling significant quantitative displacement of air from the chamber of the stroke, thus decreasing the required braking impulse and momentum acceleration of the striker when working stroke and, consequently, decrease the speed of the collision and the energy of the drummer.

Known pneumatic hammer with butterfly distribution (patent RU 2380214, M. CL. B25D 9/04, AS 37/24, 2008, a prototype), including network camera, handle to the device turn on the compressed air supply to the network camera with the inlet channel, a hollow cylinder, placed in it the drummer with the Central channel, which separates the cavity of the mentioned hollow cylinder on the camera idle and working strokes, the Central tube, filtered through the Central channel of the firing pin and connecting the network camera with the camera idle for more tube of elastic material with a closed end from the side of the camera idling, installed in the Central tube coaxially aligned her with the annular gap and held by the fastening elements relative to the Central tube made in the form of an annular disk with a through feces is brownie holes for passing air, message through the annular gap network cameras and camera idling, a fixed cover with a Central through hole for passing through it a Central tube mounted on the end face of the hollow cylinder side chamber stroke, constantly open inlet into the chamber of the stroke of the throttle channel, made in the form of an annular channel with the possibility of changing cross-sectional shape formed by the side surfaces of the Central tube and the Central through hole in the cover and connecting the network camera with the camera of the stroke, reported to last through the bypass channel annular accumulation chamber, a radial discharge passage in the side wall of the hollow cylinder, and the working tool shank.

The specified device, as containing the greatest number of essential features in relation to the offer, taken as a prototype.

The main disadvantage of the prototype: start at the beginning for machines with swing drummer is greater than its length, while compressed air into the chamber formed in the tube of elastic material, closed by an end face side of the camera idling, and through the calibrated holes in the annular disk in the annular gap between the Central tube and the tube of elastic materialisation overlap the annular gap between the Central tube and the tube of elastic material, when this compressed air will not flow into the chamber idling and running will not be made that violate the stable operation of the hammer.

The disadvantages of the prototype and similar hammers percussion with a Central tube and a tube of elastic material can be avoided if the Central tube to perform a radial channel from the front of the stroke so that the distance between the outermost edges of the radial outlet channel and the radial channel of the Central tube is not greater than the length of generatrix drummer.

Technical challenge - delivering smooth running of the pneumatic hammer.

The essence of the proposed technical solutions pneumatic hammer is as follows.

Pneumatic hammer with butterfly distribution, including network camera, handle to the device turn on the compressed air supply to the network camera with the inlet channel, a hollow cylinder, placed in it the drummer with the Central channel, which separates the cavity of the mentioned hollow cylinder on the camera idle and working strokes, the Central tube, filtered through the Central channel of the firing pin and connecting the network camera with the camera idle for more tube of elastic material with a closed end from the side of the camera idling, ustanovlenno the Central tube coaxially aligned her with the annular gap and held by the fastening elements relative to the Central tube, made in the form of an annular disk with a through calibrated holes for passing air, with the message through the annular gap network cameras and camera idling, a fixed cover with a Central through hole for passing through it a Central tube mounted on the end face of the hollow cylinder side chamber stroke, constantly open inlet into the chamber of the stroke of the throttle channel, made in the form of an annular channel with the possibility of changing cross-sectional shape formed by the side surfaces of the Central tube and the Central through hole in the cover and connecting the network camera with the camera of the stroke, reported to last through the bypass channel annular accumulation chamber radial discharge passage in the side wall of the hollow cylinder, and the working tool shank, and in the Central tube, a radial channel from the front of the stroke so that the distance between the outermost edges of the radial outlet channel and the radial channel of the Central tube is not greater than the length of generatrix drummer.

The proposed solution is illustrated by the drawings.

Figure 1 shows a hammer with a partial longitudinal section with a Central tube that is installed with the prob is the possibility of moving in the longitudinal and radial directions relative to the Central through hole in the fixed cover with a through channel in the gap between coaxial established by the Central tube and an additional tube of elastic material corresponding to the position of drummer in the end and the beginning of his idling. Figure 2 shows the hammer with a partial longitudinal section without a handle in the position of the striker at the end of the blank and the beginning of the stroke.

Pneumatic hammer with butterfly distribution (see figure 1, 2) contains a hollow cylinder 1 with a Central through-channel 2 that holds drummer 3, separating the cavity of the hollow cylinder 1 to camera 4 working and idle for 5 turns, the Central tube 6 with a radial channel 7 installed therein coaxial with the annular gap additional tube 8 made of elastic material with a closed end face 9 side camera 5 idling. The hollow cylinder 1 contains a radial outlet channel 10, the radial bypass channel 11, the cover 12 rests on the end face 13 of the hollow cylinder 1 o-ring flange 14 and the annular flange 15 resting in the bottom 16 of the Cup 17.

The Cup 17 to rest on the annular flange 15 is screwed on the hollow cylinder 1 and forms an annular accumulation chamber 18, is constantly communicated with the chamber 4 stroke through radial bypass channel 11. Between the bottom 16, the Cup 17 and the cover 12 is formed network camera 19 is provided with a network of compressed air through the inlet port 20 in the handle 21 with vklyucheniyami air. Radial outlet channel 10 reports periodically camera 4 stroke and the camera 5 idle with the exhaust chamber 22 formed between the hollow cylinder 1 and vozduhoobmenu ring 23, provided with an outlet channel 24, through which the exhaust chamber 22 is communicated with the atmosphere. Additional tube 8 made of elastic material is retained by the fastening elements relative to the Central tube 6 made in the form of annular discs 25 and 26 through calibrated holes 27 and 28 for the passage of air from network camera 19 through the annular gap 29 between the Central tube 6 and an additional tube 8 made of elastic material in the chamber 5 of idling. The working tool 30 with the shank 31 is held relative to the hollow cylinder 1 by a cap 32. Additional tube 8 made of elastic material formed by the camera 33, constantly communicated by the channel 34 with the network camera 19. The Central tube 6 from a network camera 19 is provided with a flange 35 with the possibility of pressure on the lid 12. Ring throttle channel 36 is formed by a gap between the Central tube 6 and the wall of the through-hole 37 in the cover 12 and communicates constantly network camera 19 and the camera 4 stroke each other. The leakage at the bearing of the striker 3 on the shank 31 or radial groove 38 on the drummer 3 provides pass air to the measure 5 idling.

Pneumatic hammer with throttle distribution works as follows. When pressed, until it stops working tool 30 into the processed medium shank 31 pushes the Central tube 6 and an additional tube 8 made of elastic material in the network camera 19 and turning the handle 21 with starter feed air from the network is fed via the inlet channel 20 in network camera 19. From a network camera 19, the air enters at the same time: on the annular orifice channel 36 formed by the gap between the Central tube 6 and the wall of the through-hole 37 in the cover 12, into the chamber 4 stroke and communicated with her constantly radial bypass channel 11 of the annular accumulation chamber 18 and a radial channel 7 in the annular gap 29 between the Central tube 6 and an additional tube 8 made of elastic material; for channel 34 into the chamber 33 with walls made of elastic material, closed by the end face 9 side camera 5 idle; end-to-end calibrated holes 27 in the annular disc 25, further through the annular gap 29 between the Central tube 6 and an additional tube 8 made of elastic material and through the calibrated holes 28 in the annular disk 26, and through leaks seal the ends of the striker 3 and the shank 31 or radial groove 38 into the chamber 5 of idling. In this case,since the camera 4 stroke reported radial outlet channel 10 with the exhaust chamber 22, formed between the hollow cylinder 1 and vozduhoobmenu ring 23 with an outlet channel 24, the air pressure in the chamber 4 stroke will be close to atmospheric, as the flow area of the radial outlet port 10 and the outlet channel 24 is substantially greater in comparison with reduced cross-section of the annular orifice channel 36. Due to the air pressure elastic walls of the chamber 33 will be moved apart, overlapping the annular gap 29 and datekey the air in the chamber 5 idling creates back pressure that causes large pressure force on the elastic wall of the additional tube 8 made of elastic material from the annular gap 29, as the outer square tube 8 made of elastic material more internal space, under the action of which the annular gap 29 is left open for the passage of air from network camera 19 in the chamber 5 of idling. This loss of pressure in the annular gap 29 through the radial channel 7 will be negligible because the air flow is dynamic. Under increasing pressure air from chamber 5 idling drummer 3 will begin its movement toward the cover 12, making idle.

Moving, drummer 3 covers the radial outlet channel 10, with the result that the air pressure in the chamber 4 stroke and soo is pregnant with her radial bypass channel 11 of the annular accumulation chamber 18 will increase due to compression clipped in her air and air, coming through the annular orifice channel 36 and the radial channel 7 in the Central tube 6.

The air pressure in the chamber 5 of idling reduced, despite his admission of the network camera 19 through the through calibrated holes 27, the annular gap 29 and through the calibrated holes 28, as well as from the chamber 4 stroke and communicated with her radial bypass channel 11 of the annular accumulation chamber 18 through the radial channel 7. Thus, bypass part of the air from the chamber 4 stroke for reuse by camera 5 at idle, causing thereby reducing the back pressure of the air in the chamber 4 of the stroke and the annular accumulation chamber 18, thereby providing greater stroke of the striker 3. This increases the pulse pressure chamber 5 idling.

When moving the striker 3 will open radial outlet channel 10 and from the chamber 5 idling will exhaust air in the exhaust chamber 22 and then through outlet 24 into the atmosphere. Despite the flow of air into the chamber 5 of idling of the network camera 19, the air pressure in the chamber 5 of idling will be close to atmospheric. The pressure of air on the outer side surface of the additional tube 8 made of elastic material to reduce the seeking and at a higher air pressure on the inner side surface of the additional tube 8 made of elastic material from the chamber 33 with walls made of elastic material, girth size additional tube 8 made of elastic material will increase and will block the flow area of the annular gap 29 between the Central tube 6 and an additional tube 8 made of elastic material (see figure 2), resulting in the flow of air into the chamber 5 of idling stops.

Continuing the movement of the firing pin 3 will overlap the radial channel 7 and the process of displacement of air from the chamber 4 stroke will stop.

Drummer 3 under the action of the momentum acquired by the camera 5 idling, will continue to move, compressing the air in the chamber 4 stroke simultaneously pass through the radial bypass channel 11 in the annular accumulation chamber 18. This will help ensure a smooth increase in pressure in the chamber 4 of the stroke, the greater the fly drummer 3, less pressure on the cover 12 and, consequently, the smaller the force of bestowal and the smaller the amplitude of the oscillations of the hollow cylinder 1 and in General of a hammer.

Exhausting the pressure pulse is idling, drummer 3 will begin to slow down its movement will stop at the clearing point of the side cover 12 and immediately under the action of pressure Vozduha side camera 4 stroke and the annular accumulation chamber 18 will move in the direction of the shank 31 of the working instrument 30, making the stroke. The air pressure in the chamber 4 stroke will be supported settlement due to the flow through the annular orifice channel 36 from the network camera 19 and pass through the radial bypass channel 11 of the annular accumulation chamber 18.

Moving the firing pin 3 will cover the radial outlet channel 10 and opens the radial channel 7, and in the chamber 5 of idling will begin the process of compression clipped in her air with increasing pressure, which is passed through an orifice 28 in the annular gap 29 between the Central tube 6 and an additional tube 8 made of elastic material, as well as from the chamber 4 stroke through the radial channel 7.

Continuing the movement to the shank 31 drummer 3 provides the maximum design pressure of the air in the chamber 5 of idling, which affects a large outer surface of the additional tube 8 made of elastic material, while providing a greater pressure than the operating force of pressure on the inner surface of the additional tube 8 made of elastic material from the chamber 33 with walls made of elastic material. This causes the opening of the bore of the annular gap 29 between the Central tube 6 and an additional tube 8 made of elastic material and the receipt of the hcpa the ha from a network camera 19 on the cross-calibrated holes 27 of the annular disk 26 into the chamber 5 of idling. By this time drummer 3, overcoming the pressure of air from the chamber 5 idling, strikes the shank 31 of the working instrument 30. After that, the described process will be repeated with the only difference that the movement of the striker at idle will be at the expense of the acquired pulse pressure and pulse rebound from the shank.

Thus, the radial channel 7 in the Central tube 6 from the side of the camera 4 stroke allows the smooth running of the pneumatic hammer.

Pneumatic hammer with butterfly distribution, including network camera, handle to the device turn on the compressed air supply to the network camera with the inlet channel, a hollow cylinder, placed in it the drummer with the Central channel, which separates the cavity of the mentioned hollow cylinder on the camera idle and working strokes, the Central tube, filtered through the Central channel of the firing pin and connecting the network camera with the camera idle for more tube of elastic material with a closed end from the side of the camera idling, installed in the Central tube coaxially aligned her with the annular gap, providing a message to a network camera and camera idling, and held items fixing relative to the Central tube, the imp is United in the form of an annular disk with a through calibrated holes for passing air, a fixed cover with a Central through hole for passing through it a Central tube mounted on the end face of the hollow cylinder side chamber stroke, constantly open inlet into the chamber of the stroke of the throttle channel, made in the form of an annular channel with the possibility of changing cross-sectional shape formed by the side surfaces of the Central tube and the Central through hole in the cover and connecting the network camera with the camera of the stroke, reported to last through the bypass channel annular accumulation chamber, a radial discharge passage in the side wall of the hollow cylinder, and the working tool shank, characterized in that the Central tube a radial channel from the front of the stroke so that the distance between the outermost edges of the radial outlet channel and the radial channel of the Central tube does not exceed the length of the generatrix of the drummer.



 

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EFFECT: invention provides for reduction of inefficient air flow.

2 cl, 2 dwg

Acerate gun // 2370358

FIELD: mechanics.

SUBSTANCE: invention relates to impact device and may be used to clean surfaces, namely to remove remains of old paint and rust film. The device is comprised of a cylindrical body, where movable cylinder is installed between two compression springs so that it can slide. The flying piston displaces in the cylinder in a reciprocal manner and under compressed air action and transfers impact pulse to anvil. The pin carrier rests upon the said anvil under the pressure of one spring. Besides a multiple set of pins is available in pin carrier so that they can slide in axial direction and adjoin the said anvil by their end heads under operating pressure. The pin carrier contains cup with guiding plate which is made up from at least two layers of material having different rate of hardness or resistance to wear. The layers are placed perpendicularly to pin displacement direction, while guiding plate material layer, which is the nearest layer to the anvil, is made up from hard or more wear-resistant material as compared to the next layer coming in axial direction of pins.

EFFECT: extended lifetime of device.

11 cl, 5 dwg

FIELD: engines and pumps.

SUBSTANCE: pneumatic device comprises body with radial exhaust channel and central channel, cover with annular collar and central opening, striker with axial through channel, which separates body central channel into chambers of idle run and working stroke, tube with dead collar from the side of cover, longitudinal and radial channels, sleeve installed with creation of annular accumulation chamber between side surfaces of sleeve and body, air-deflection ring with discharge openings, exhaust chamber produced between body and air-deflection ring, and working tool. Additional tube is installed coaxially to tube, being coupled with it, with radial channels to create annular gap between mentioned tubes in the form of displacement channel. Distances between most distant edges of radial exhaust channel and radial channel of additional tube installed on the side of idle run chamber, and between most distant edges of radial exhaust channel and radial channel of additional tube installed from the side of working stroke chamber, is more than length of striker generatrix.

EFFECT: speed of striker collision to working tool is increased.

1 dwg

FIELD: machine building.

SUBSTANCE: percussion mechanism of hand-held machine contains an impact device and a compensating device meant for force generation directed against resultant force of impact device. Compensating device is designed as dynamic vibration absorber containing counter-balance vibrating in opposition to impact device. Compensating device contains an arrester meant for arresting counter-balance in idle position. Arrester is provided with locking member and fixing member. Locking member is installed with possibility of movement to locking chamfer located inside counter-balance. Fixing element is flexibly installed inside locking member.

EFFECT: reducing wearing of percussion mechanism of hand-held machine.

4 cl, 6 dwg

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