Pneumatic jackhammer

FIELD: mechanics.

SUBSTANCE: pneumatic jackhammer contains the case with antivibration handle and compressed air feed means, a duct arranged in the case to axially move therein, a shock absorber, a working member and a vibration damper. The duct is made up of two cups. The first cup open end accommodates a detachable cover. The second cup bottom has an orifice representing a guide. Note that the second cup outer surface is furnished with a circular groove, its both sides being provided with circular chutes receiving O-rings sealing the gap between the second cup outer surface and the case inner surface. The working member shaft idle end is furnished with an axial bore. The working member bottom is provided with through holes to communicate working member axial bore space with its outer surface. The working member working end can reciprocate through the orifice made in the second cup bottom. The working member idle end is furnished with a collar to interact with the second cup inner surface. The vibration suppressor represents a cylindrical sleeve with a through axial hole made in the first cup and spring-loaded relative to the first cup bottom and the detachable cover.

EFFECT: minimum level of vibration.

4 cl, 2 dwg

 

The invention relates to mechanical engineering, in particular can be used for screening of old paint and rust hull and repair.

Known pneumatic hammer, containing the tool body, the drummer and the inertia of the piston (see Tupitsyn K.K. About the improvement of the vibration force characteristics of pneumatic hammers. - In the book. Protection of the human operator and vibrations in machines. - M.: Nauka, 1977).

The disadvantage of such machines is the difficulty of ensuring stable operation in a wide range of changes in external conditions and the complexity of starting with an arbitrary initial positions.

Known pneumatic chipping hammer, comprising a housing with vibration protection arm, provided with a means for supplying compressed air, a shaft mounted in the housing for axial movement, a shock absorber and a working tool (see RF patent №2172667, 2001).

The disadvantage of this solution is the lack of effectiveness of vibration damping, especially in the context of dynamic parameters of a hammer, which leads to deterioration of working conditions and higher incidence of fibroblast and hearing loss.

The challenge which seeks the proposed solution, which seeks to ensure minimum vibration level.

The technical result, which is manifested p and solving the problem, expressed in simplifying the structure of the device, improving working conditions, reducing the incidence of fibroblast and hearing loss due to significant (below the applicable sanitary standards) to reduce vibration of the tool.

The problem is solved in that a pneumatic chipping hammer, comprising a housing with vibration protection arm having means for supplying compressed air, a shaft mounted in the housing for axial movement, a shock absorber and a working tool, characterized in that it is equipped with vibration damper, the barrel is made of a composite in the form of the first Cup at the open end which is detachable cover, and at its opposite end made the thread, and the second glass, the bottom of which is made a hole as a guide, and at its open end made a thread for fastening with a corresponding thread of the first glass on the outside the surface of the second nozzle ring groove and located on both sides of the last annular grooves, in which is placed a sealing ring for sealing a gap between the outer surface of the second glass and the inner surface of the housing at a bottom of the second glass panel is a through hole, the mouth of which is located in said annular groove of the second glass, a work tool is NT done with working and non-working ends and an axial bore, performed on the axis of the working tool from its outside end, at the bottom of the working tool is a through hole for a message cavity of the axial bore of the working tool with its outer surface, the working end of the working tool has a capability reciprocating movement through the said slot in the bottom of the second glass, the non-working end of the working tool is made with flanges for contact with the inner surface of the second glass, means for supplying compressed air is made in the form of a pipe having a hole communicated with the cavity of the annular grooves of the second Cup, and attached to the outer surface of the casing, the casing is made in the form of a cylindrical shell, the diameter speed varies along its length, one end of the housing has a larger diameter and the other is smaller on the side of the case with a large diameter is removable cap, and the end of the body with a smaller diameter is opened, the damper is made of conditions ensure podpruzhineny of the barrel relatively to both of these ends of the body, and the vibration damper is made in the form of a cylindrical sleeve with a through axial hole placed in the cavity of the first Cup and spring-loaded against the bottom of the first Cup and detachable cover. The external surface of the cylinder is nticeship sleeves are made with annular flanges, in which operty the ends of the compression spring, the second ends of which operty, respectively, in the bottom of the first Cup and detachable cover. In addition, the outer surface of the first nozzle with o-ring belt, in which operty the ends of the compression spring, the second ends of which operty respectively in the jumper that connects the parts of the body hammer and a removable lid. In addition, it has confused cowling, located on the side of the case with a smaller diameter.

Comparative analysis of the essential features of the proposed technical solutions with a set of essential features of the prototype and analogues demonstrates its compliance with the criterion of "novelty"

Thus the set of distinctive features in the claims solves the following functional tasks.

The sign "... the barrel is made of a composite in the form of the first Cup at the open end which is detachable cover, and at its opposite end made the thread, and the second glass, the bottom of which is made a hole as a guide, and at its open end made a thread for fastening with a corresponding thread first ..." provides the possibility of combining in one unit of the working tool and a damper, which allows you to operate the damper in the mode of "protivogazy" with the movement of the working tool and, thus, neutralization of the basic spectrum of vibration of the hammer, in addition, it eliminates the loss of the working tool and suppressor from the barrel.

Sign "... at the bottom of the second glass panel is a through hole, the mouth of which is located in said annular groove ..." allows messages cavity of the second glass with a means of compressed air.

The sign "... working tool completed with a working and non-working ends and an axial hole made on the axis of the working tool from its outside end ..." provides a duty cycle (discharge air from the cavity of the body) with full extension of the working tool from the trunk.

The sign "... at the bottom of the working tool is a through hole for a message cavity of the axial bore of the working tool with its outer surface, the working end of the working tool has a capability reciprocating movement through the said slot in the bottom of the second glass ..." eliminates the possibility of oscillation of the tool from its longitudinal axis.

The sign "... the non-working end of the working tool is made with flanges for contact with the inner surface of the second glass ..." eliminates loss of the working tool from the trunk.

The sign "... tool dive torches etc is as compressed air is made in the form of a pipe, having a hole communicated with the cavity of the annular grooves of the second Cup, and attached to the outer surface of the hull ..." elaborates on the design tools compressed air.

The sign "... the body is made in the form of a cylindrical shell, the diameter of which speed varies along its length ..." allows podpruzhineny of the barrel relative to the body in the presence of a removable cap on the end.

The sign "... at the end of the body with a larger diameter is located removable cover, and the end of the body with a smaller diameter open ..." allows podpruzhineny of the barrel relative to the body in the presence of the above-mentioned pinches, in addition, provides the reciprocating movement of the stem within the body.

The sign "... the shock absorber is made of conditions ensure podpruzhineny of the barrel relatively to both of these ends of the body ..." increases the efficiency of the damping shaft in the housing.

The sign "... the vibration damper is made in the form of a cylindrical sleeve with a through axial hole placed in the cavity of the first Cup and spring-loaded against the bottom of the first Cup and detachable cover ..." should provide a damper in the mode of " protivogazy" with the movement of the working tool and thereby neutralize the main volume of the spectrum is brazii hammer.

The sign "... the external surface of the cylindrical sleeve is made with an annular band, which operty the ends of the compression spring, the second ends of which operty, respectively, in the bottom of the first Cup and detachable cover ..." reveals the design, providing the springing of the damper in the direction along the longitudinal axis of the working tool and thereby provides the opportunity to "work (vibration, oscillation) of the absorber in antiphase with the working tool.

The sign "... the external surface of the first nozzle with o-ring belt, in which operty the ends of the compression spring, the second ends of which operty respectively in the jumper that connects the parts of the body hammer and a removable lid ..." reveals the design of the shock absorber, which allows podpruzhineny of the barrel relatively to both ends of the housing.

The sign "... equipped with a confused cowling, located on the side of the case with a smaller diameter ..." restricts longitudinal movement of the barrel from the housing cavity.

Figure 1 shows a longitudinal section of a pneumatic hammer. Figure 2 shows the dependence of the displacement of the working tool, damper and sleeve, where curve 1 shows the movement of the sleeve, curve 2 - move the working tool and curve 3 - move the damper.

The pneumatic hammer OTB is iny includes a housing 1 with vibration protection arm 2, means for supplying air 3, shaft, strut and a working tool 4. The housing 1 is made in the form of a cylindrical shell, the diameter of which is stepwise changed in length. End of the housing is larger in diameter provided with a removable cover 5, the smaller the circle is left open. In the housing 1 with the possibility of axial movement installed the barrel. The barrel is made of a composite in the form of the first glass 6, at the open end which is detachable cover 7, and at its opposite end made a thread for fastening the open end of the second glass 8, provided with a corresponding thread. At the bottom of the second glass 8 is provided with a slot as a guide, through which, with the possibility of reciprocation skipped the working end of the working tool 4. The non-working end of the working tool 4 is equipped with a belt 9 in contact with the inner surface of the cavity of the second glass 8. At the bottom of the second glass 8 in the wall is a through hole 10. The outer surface of the second glass 8 is provided with a circular groove 11 which is placed in the mouth of these holes 10. The gap between the outer surface of the second glass 8 and the inner surface of the housing 1 are sealed with o-rings 12. The sealing ring 12 is placed in the annular grooves 13, performed on the outer top of the spine of the second glass 8 on both sides of the annular groove 14. Means for supplying compressed air 3 is made in the form of a nozzle, attached to the outer surface of the housing 1. The pipe 3 provided with a hole 15 provided with a cavity ring groove 11. On the axis of the working tool 4 from its outside end is made of the longitudinal groove 16, the bottom of which is a through hole 17, which tells the cavity of the recess 16 with the outer surface of the working tool 4. At the working tool 4 is made holes 18 located in the plane perpendicular to the plane of arrangement of the holes 17 above holes 17.

The absorber consists of a first glass 6 and the upper and lower springs 19 with podpruzhineny of the barrel relatively to both ends of the housing 1. In the cavity of the first glass 6 posted by a vibration damper made in the form of a cylindrical sleeve 20, provided with a through axial hole 21, the spring-loaded springs upper 22 and lower 23 against the bottom and the cover 7 of the cavity of the Cup 6. The outer surface of the sleeve 20 provided with an annular shoulder 24, in which operty the corresponding ends of the springs 22 and 23 of the compression, the second ends of which operty respectively in the bottom and the cover 7 of the cavity of the first glass 6. In addition, the outer surface of the first glass 6 is provided with an annular shoulder 26, which operty the corresponding ends of the compression spring 19, the second ends of which operty according to the state in the jumper, connecting the parts of the body 1 of the hammer and the cover 5 of the body cavity. End of the housing 1, a smaller diameter, equipped with a confused cowling 27.

The pneumatic hammer chisel works as follows. The tool is connected to the compressed air system. When switching on the supply air from a compressed air source (not shown) through the cavity vibration protection arm 2 is directed to means for supplying air 3 and further into the cavity of the annular groove 11, the ends of which are tightly overlapped sealing rings 12. The air pressure begins to squeeze and press the working tool 4 into the cavity of the second glass 8. During this movement, the volume in the cavity of the second glass 8, limited its bottom, sidewalls and addressed to them the surface of the working tool 4, is constantly communicating with the atmosphere through holes 17 made at the end of the longitudinal grooves 16 (axial holes), which provides the excess pressure in the cavity of the groove 11 of the pressure in the cavity of the second glass 8. This movement continues until the hole 18 made in the walls of the working tool 4, are not on the same level with the groove 11, simultaneously overlap the through holes 17, overlying air outlet into the atmosphere, then the air begins to enter the cavity of the second glass 8. Starts the backward movement R of the working tool 4, because compressed air through the groove 11 and the through holes 18 presses on the surface of the working tool 4, facing the bottom of the second glass 8. Upon completion of this movement the working end of the working tool 4 is forcibly expelled from the cavity of the barrel and acts on the workpiece surface. At the same time the holes 17 are communicated with the atmosphere, which leads to the discharge of air from the cavity of the second glass 8. As a result, the pressure in the cavity of the ring groove 11 is higher than the pressure in the cavity of the second glass 8, which leads to a repetition of the process of involving the working tool 4 into the cavity of the second glass 8. When the reciprocating motion having power of bestowal, which is first transmitted to the first glass 6 and lead to compression of the upper spring 19 and the damper 20, the forces of inertia which is directed oppositely to the force of bestowal, through the lower spring 23 prevents this movement, preventing movement of the Cup 6. When moving in the opposite direction of the working tool 4 the power of recoil moves the first glass 6 down and forces to compress the lower spring 19 and the damper 20, the forces of inertia which is directed oppositely to the force of bestowal, through the upper spring 22 prevents this movement, preventing movement of the Cup 6. The mass of the vibration damper and stiffness of the springs of the damper expect the Xia thus, to the circular frequency of vibration of the working body was equal to its own circular frequency of the damper springs. Then the damper is configured so that it will operate in the mode of antiresonance (see figure 2). Thus, the operation of the damper in the mode of "protivogazy" with the movement of the working tool will neutralize the main volume of the vibration spectrum of a hammer.

1. Pneumatic chipping hammer, comprising a housing with vibration protection arm having means for supplying compressed air, a shaft mounted in the housing for axial movement, a shock absorber and a working tool, characterized in that it is equipped with a vibration damper, the barrel is made of a composite in the form of the first Cup at the open end which is detachable cover, and at its opposite end made the thread, and the second glass, the bottom of which is made a hole as a guide, and at its open end made a thread for fastening with a corresponding thread of the first glass on the outer surface of the second nozzle ring groove located on both sides of the last annular grooves, in which is placed a sealing ring for sealing a gap between the outer surface of the second glass and the inner surface of the housing at a bottom of the second glass panel is made through open is I, the mouth being located in said annular groove of the second glass, a working tool completed with a working and non-working ends and an axial hole made on the axis of the working tool from its outside end, at the bottom of the working tool is a through hole for a message cavity of the axial bore of the working tool with its outer surface, the working end of the working instrument executed by the possibility of reciprocating movement through the said slot in the bottom of the second glass, the non-working end of the working tool is made with flanges for contact with the inner surface of the second glass, means for supplying compressed air is made in the form of a pipe having a hole provided with the cavity of the annular grooves of the second Cup, and attached to the outer surface of the casing, the casing is made in the form of a cylindrical shell, the diameter of which speed varies along its length, one end of the housing has a larger diameter and the other is smaller on the side of the case with a large diameter is removable cap, and the end of the body with a smaller diameter is opened, the damper is made of conditions ensure podpruzhineny of the barrel relatively to both of these ends of the casing, the vibration damper is made in the form of a cylindrical sleeve with a through sevim hole, placed in the cavity of the first Cup and spring-loaded against the bottom of the first Cup and detachable cover.

2. Pneumatic chipping hammer according to claim 1, characterized in that the outer surface of the cylindrical sleeve is made with an annular band, which operty the ends of the compression spring, the second ends of which operty, respectively, in the bottom of the first Cup and detachable lid.

3. Pneumatic chipping hammer according to claim 1, characterized in that the outer surface of the first nozzle with o-ring belt, in which operty the ends of the compression spring, the second ends of which operty respectively in the jumper that connects the parts of the body of the hammer, and a removable lid.

4. Pneumatic chipping hammer according to claim 1, characterized in that it has confused the shell located on the side of the case with a smaller diameter.



 

Same patents:

FIELD: engines and pumps.

SUBSTANCE: air hammer incorporates housing (5) arranged in casing (2) furnished with damping spring (8) fitted therein between collar (7) of housing (5) and collar (9) of casing (2). Housing (5) accommodates striker (1) for it to reciprocate therein. The air hammer comprises handle (1) and sleeve (3) fitted between casing (2) and handle (1) to form with it an air damping chamber (4). The upper part (6) of housing (5) limited by collar (7) slides in sleeve (3) to enter the air damping chamber (4).

EFFECT: ease of operation.

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FIELD: machine engineering, namely percussion-action pneumatic machines.

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EFFECT: improved design providing vibration resistance, lowered noise level, enhanced operational efficiency, lowered mass of machine.

3 cl, 3 dwg

Pneumatic hammer // 2280554

FIELD: mechanical engineering; building construction; mining art.

SUBSTANCE: pneumatic hammer has case. Striker of hammer is disposed inside the case for reciprocal motion. Casing provided with exhaust ports embraces the case for slide against it. Pneumatic hammer also has collector, handle and working tool. Handle is mounted onto case for slide. Vibration insulator is disposed between handle and case. Collector is connected with front part of handle and it embraces the casing for slide against it. Casing has rear bead and. Case is flexible connected with handle for movement of casing along case at the direction of working tool. To move casing along case in the direction of working tool, the other vibration insulator is mounted between front part of collector and rear bead of casing for rest.

EFFECT: reduced vibration of pneumatic hammer.

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EFFECT: improved shock absorbing properties of hammer.

3 cl, 2 dwg

FIELD: mining, particularly hand tools or hand-held power-operated tools specially adapted for dislodging minerals.

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EFFECT: increased operational reliability and power of hammer stroke.

2 dwg

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EFFECT: increased power of hammer stroke.

1 dwg

Pneumatic hammer // 2244828

FIELD: mechanical engineering; jack hammers.

SUBSTANCE: proposed hammer has housing with two working chambers, upper and lower ones, arranged in tandem and divided by bridge with hole. Striker in form of rod with two pistons end ends, upper and lower ones, is installed in chambers. Striker is in contact with shank of working tool. Hammer is provided with air distributor and channels in housing. Channel along which compressed air is supplied to execute idle stroke of striker are laid only to lower part of upper chamber under upper piston. Chamber under lower piston is in constant communication with atmosphere through holes in walls of housing in zone of contact of striker with shank of working tool.

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2 cl, 2 dwg

FIELD: mining industry, construction, mechanical engineering, etc.

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EFFECT: higher efficiency, lower vibration, higher effectiveness.

7 dwg

The invention relates to mining and can be used in the mining and coal industry

FIELD: engines and pumps, mining operations.

SUBSTANCE: device comprises a supply air chamber, a device cutting in the compressed feed into the supply air chamber, a hollow cylinder housing a striker separating the cylinder space into idle cycle and running cycle chambers, an accumulation chamber communicating continuously, via passageway, with the running cycle chamber and arranged on the cylinder end face on the said running cycle chamber side, a constantly open throttle operation chamber inlet channel, an outlet channel furnished in the cylinder side wall, a working tool with a tail. The aforesaid device has a barrel provided with an annular collar and a flow-through pressure augmentor chamber arranged on the idle cycle chamber side communicating continuously, via the cover throttle inlet channel, annular groove and the cylinder lengthwise channel, with the supply air chamber, and, intermittently, via the pressure augmentor radial channel and the cylinder annular groove, with the idle operation chamber. The striker is furnished with the throttling start channel. The aforesaid barrel bottom faces the cover and bears, by its annular collar, on the cover collar to form the supply air chamber, the distance from the pressure augmentor channel exit to the outlet channel being smaller than the striker length.

EFFECT: higher effect on the processed medium.

7 cl, 6 dwg

FIELD: mining.

SUBSTANCE: invention relates to the construction and mining machines with impact action for fragmentation of rocks and frozen ground by heavy airbreaking machines and to the plugger drills. The device contains the chamber of the network air, prechamber, quill cylinder with installed hammer which separates the cylinder cavity to chambers of the idle and working stroke, head with collar, permanently open inputting throttle conduit made in the tube and connecting the network chamber with the idle chamber, cartridge with the annular collar faced to the head collar, lentic afterburning chamber in the cylinder wall from the idle chamber side, radial afterburning conduit in the cylinder wall which connects the lentic afterburning chamber with the idle chamber, discharge ports in the cylinder sidewall and the operating device with the tail piece. At the level of the afterburning conduit, the hammer and the cylinder have the inner groove chambers which are periodically communicated between each other via the bypassing conduit so as the length of the inner groove chamber on cylinder is less than the hammer's length. On the side tube surface, the radial channel is made to communicate periodically the inner groove chamber in the hammer with the tube longitudinal throttle conduit which is provided with the triggering throttle conduit from the device's side.

EFFECT: impact effect of pneumatic device on treated medium is increased.

2 cl, 2 dwg

FIELD: mechanics.

SUBSTANCE: invention is related to construction and mining impact machines. Mechanism includes network air chamber, pre-chamber, hollow cylinder with striker splitting cylinder cavity into working and idle stroke chambers, lid with bead at one cylinder end from working stroke chamber side, tube with continuously opened inlet duct. Inlet duct connects pre-chamber with idle stroke chamber. Mechanism is also comprised of a cup with circular bead directed to lid bead, circular static boosting chamber in cylinder wall from the side of idle stroke chamber. Boosting duct in cylinder wall is in the form of radial channel connecting static boosting chamber with idle stroke chamber. Boosting duct connects also outlet ducts in cylinder walls and operating tool with tongue. Striker is provided with internal and external recessed chambers interconnected by bypass duct and so that the distance from cutoff edge of boosting duct shear to outlet duct is more than the length of external recessed chamber on striker. Side surface of tube is ensured with radial channel connecting internal recessed chamber in striker with longitudinal tube ducts. From the side of operating tool longitudinal duct of tube is provided with start-up throttle.

EFFECT: increase of impact effect to treated medium.

1 dwg

FIELD: mechanics.

SUBSTANCE: hammer consists of a body with radial outlet and central channels, lid with central hole, striker with axial through channel splitting central channel into working stroke and idle stroke chambers, tube with dead bead from the side of cover. Cover is provided with radial and longitudinal channels and installed coaxially in central channel and displaced in axial through channel of striker and central hole of lid. Cup in the hammer is tightly installed as regard to hammer body forming circular accumulating chamber, which contacts with working stroke chamber by means of radial bypass channel in hammer body. Network air pre-chamber with air supply channel continuously interacts with compressed air network. Hammer also includes air baffling ring with outlet slotted channel, operating tools with bead interacting with body end, operating tool tongue, cap to prevent operating tool from dropping out from central body channel. Hammer body is provided with groove from the side of cup and lid is located in groove to enable reciprocal movements.

EFFECT: reduction of back pressure forces in working stroke chamber and improvement of hammer vibration indicators.

2 dwg

FIELD: invention refers to strengthening element for fixing in short, not under core hole, mode and adjusting instrument for fixing similar strengthening element.

SUBSTANCE: mentioned strengthening element has rod, which on one end has thrust cone, which expands in direction to rod, and non-split, tubular clenched bushing through which rod passes and which for expansion and fixing in blind hole is fulfilled with possibility of its pulling on thrust cone so, that it expands in face field turning to thrust cone. Hollow conic expansion of clenched bushing has more sharp conic angle then thrust cone. Mode of fixing of strengthening element in opening is in that clenched bushing is pulled on thrust cone by way of transfer on clenched bushing of vibrating movements in ultrasound diapason of frequencies. Fixing with such mode is light and lightly loads the place of fixing. Adjusting instrument for strengthening element has central rod entering into axial opening of thrust cone at installation on face side of clenched bushing. At that adjusting element has tubular rim circling around central rod for installation on face side of clenched bushing. External diameter of rim is no larger then external diameter of clenched bushing.

EFFECT: increases reliability of strengthening.

13 cl, 13 dwg

FIELD: percussion mining and construction machines, particularly methods or devices for dislodging with or without loading.

SUBSTANCE: device comprises supply-line air chamber, switching device, which initiates compressed air delivery to supply-line air chamber, hollow cylinder, striker, which divides cylinder interior into idle and working stroke chambers and lid installed at cylinder end from working stroke chamber side. The lid has rim supporting rim of cup so that supply-line air chamber is created in-between. Device also has pipe arranged in lid orifice and provided with permanently opened inlet throttle channel communicated with idle stroke chamber. The inlet throttle channel connects supply-line air chamber with idle stroke chamber. Lid also has annular inlet throttle channel providing flow inlet in working stroke chamber and defined by pipe side wall and lid orifice. Device also comprises accumulation chamber permanently communicated with working stroke chamber through radial bypass channel in cylinder, discharge channels formed in side cylinder walls and working tool with stem. Blind augmenter is located in cylinder wall from the side of idle stroke chamber. The augmenter is permanently communicated with supply-line air chamber by means of radial augment channel made in cylinder body. Distance between distributing augment channel edge section and discharge channel is less than striker travel.

EFFECT: increased impact force to be applied to substance to be worked.

1 dwg

FIELD: percussion mining and construction machines, particularly methods or devices for dislodging with or without loading.

SUBSTANCE: device comprises supply-line air chamber, switching device, which initiates compressed air delivery to supply-line air chamber, hollow cylinder, striker, which divides cylinder interior into idle and working stroke chambers and accumulation chamber permanently communicated with working stroke chamber thorough bypass channel. Device also has lid installed at cylinder end from working stroke chamber side and permanently opened inlet throttle channel communicated with idle stroke chamber. Device comprises discharge channel made in cylinder wall and working tool with stem, as well as cup with bottom facing the lid and provided with annular rim supported by rim made in the lid to create supply-line air chamber. Blind augmenter is located in cylinder wall from idle stroke chamber side. The augmenter is permanently communicated with supply-line air chamber by means throttle channel made in lid, annular groove and longitudinal channel of the cylinder. The augmenter periodically communicates with idle stroke chamber by means of radial augment channel made in cylinder. Striker has annular groove and is provided with starting throttle channel. Distance between distributing augment channel edge section and discharge channel is less than striker travel.

EFFECT: increased impact force to be applied to substance to be worked.

6 cl, 5 dwg

FIELD: percussion mining and construction machines, particularly methods or devices for dislodging with or without loading.

SUBSTANCE: device comprises supply-line air chamber, switching device, which initiates compressed air delivery to supply-line air chamber, hollow cylinder, striker, which divides cylinder interior into idle and working stroke chambers and accumulation chamber permanently communicated with working stroke chamber thorough bypass channel. Device also has lid installed at cylinder end from working stroke chamber side and permanently opened inlet throttle channel communicated with idle stroke chamber and starting throttle channel permanently opened in idle stroke chamber and connecting supply-line air chamber with idle stroke chamber. Device comprises discharge channel made in cylinder wall and working tool with stem, as well as cup with rim and blind augmenter located in cylinder wall from idle stroke chamber side. The blind augmenter is permanently communicated with supply-line air chamber via throttle channel made in lid. The blind augmenter is periodically connected with idle stroke chamber through radial augment channel made in cylinder wall. Distance between distributing augment channel edge section and discharge channel is less than striker travel. Cup has bottom facing the lid and is provided with annular rim supported by rim made in the lid to create supply-line air chamber.

EFFECT: increased impact force to be applied to substance to be worked.

1 dwg

Impact mechanism // 2286226

FIELD: plastic metal working; impact-type mechanisms for stamping, riveting and striking the gates.

SUBSTANCE: proposed impact mechanism has power cylinder with working and idle stroke cavities where piston-striker is arranged. Piston is provided with two rods. Working tool is secured on one of rods. Cross-sectional area of second rod exceeds that of rod provided with working tool. Impact mechanism includes receiver which is connected with compressed air source at all times and is brought in communication with working stroke cavity of power cylinder. Impact mechanism is also provided with distributor made in form of electrically- and pneumatically-controlled two-position three-line spool valve. Receiver is provided with passages and power cylinder has holes for connection with these passages; these holes are made in side wall of cylinder sleeve and are closed by piston-striker at moment when it returns to initial position.

EFFECT: increased impact energy.

3 cl, 1 dwg

FIELD: building equipment.

SUBSTANCE: pneumatic hammer includes handle, jacket, housing mounted in jacket, air shock absorbing chamber and shock absorbing spring. Sleeve is arranged between handle and jacket; air supply branch pipe is mounted in said sleeve with possibility of motion. Air shock absorbing chamber is formed by means of handle and sleeve. Shock absorbing spring is mounted between beads formed on housing and on jacket.

EFFECT: improved shock absorbing properties of hammer.

3 cl, 2 dwg

FIELD: ultrasonic tools for vibration-percussion working of ductile metals and alloys by plastic deforming, possibly relaxation-strengthening and passivation treatment, for example of welded joints, surfaces of metallic structures subjected to action of atmospheric, water and soil corrosion.

SUBSTANCE: ultrasonic vibration-percussion tool includes sleeve mounted in wave-guide acoustic transformer at interference whose effort corresponds to its radial deformation exceeding amplitude of cross oscillations of wave-guide acoustic transformer in node of longitudinal oscillations when transformer operates in idle mode. Guides are joined to body of tool through elastic vibration-insulation gaskets.

EFFECT: lowered harmful action of vibrations acting upon operator or upon apparatus controlling operation of tool used as part of manufacturing system.

2 cl, 2 dwg

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