Pneumatic percussion mechanism

FIELD: machine building.

SUBSTANCE: invention relates to building industry and mining, in particular to the pneumatic devices with impact action. The percussion mechanism includes cylindrical casing with inlet channels, ring flange with through central hole, work tool with shank, step striker with stock part, rod with piston part installed in the central hole of the ring flange, piston part is permanently in the through axial hole of the step striker, ring chamber of the pneumatic buffer, bushing of the cylindrical casing with hole for the stock part passage, creating from side of the ring chamber of the pneumatic buffer a ring bridge limiting movement of the step striker, secured relatively to the cylindrical casing of the sleeve with channel for ail feeding, ring distributing chamber in the bushing of the cylindrical casing, chamber of network air from the side of the ring flange, idle stroke chamber at side of the work tool shank, held by the spring relatively to the cylindrical casing. Channel-slot on the side surface of the rod piston part interacting with the through axial hole in the step striker is made helical.

EFFECT: reduced air backpressure in the idle stroke chamber at and of the work stroke, increased impact energy, and frequency of impact of the pneumatic striker.

1 dwg

 

The invention relates to the construction and mining industry, in particular to pneumatic percussion devices.

Known pneumatic percussion mechanism (see, for example, and.with. The USSR 359382, M. CL E21C 3/24 1972) includes a cylindrical body with outlet channels, an annular flange with a through Central hole, a work tool shank, stepped drummer with rod part with a through axial hole and a bushing with a channel-groove installed in the through axial hole and fixed relative to the annular flange, a piston rod with a part that resides in the through axial stepped hole of the firing pin and cooperating with the channel-groove bushing, the bushing cylindrical body with an aperture for the passage of the stem portion of the stepped pin, a glass channel for supplying air, resting on the annular flange and is fixed relative to the cylindrical body, an annular distribution chamber in the sleeve of the cylindrical housing and the camera network of air in the glass, separated by an annular flange, an annular pneumatic chamber of the buffer from the base ends of stepwise drummer and the camera idling with the sides of the shank of the working tool held by the spring relative to the cylindrical body. The channel-groove in the sleeve, when the mutually�deistvie with part of the piston rod, provides opening and closing the through axial hole of the firing pin. The sleeve is a cylindrical body, forming an annular isthmus from the pneumatic chamber of the buffer limits the amount of movement speed drummer.

This mechanism has disadvantages: the annular chamber formed by the cylinder housing and rod part of the drummer, not involved in the formation of the power pulse of air pressure, which prevents the increase of the impact energy; the implementation of the stem of the firing pin must ensure that the planting is installed in the cylinder sleeve, ensuring its alignment with the rod, and the increase in the strength of resistance to the piston movement of the rod in the sleeve, the braking drummer and a decrease in the reliability of the rod, rigid bolt-on which enhances the reduction of its reliability.

Also known pneumatic percussion mechanism (see, for example, patent RF 2432442, M. CL E21B 4/14 2010 - prototype), including a cylindrical body with outlet channels, an annular flange with a through Central hole, a work tool shank, stepped drummer with rod part, mounted in the Central hole of the annular flange of the piston rod with a part that resides in the through axial hole of the stepped pin, an annular pneumatic chamber�th buffer the sleeve cylindrical housing with a hole for the passage of the stem portion formed by an annular pneumatic chamber of the buffer ring isthmus, limiting the amount of movement of the stepped pin, is fixed relative to the cylindrical body of a glass channel for supplying air, an annular distribution chamber in the sleeve of the cylindrical housing, the camera network air from the annular flange, the camera idling with the sides of the shank of the working tool held by the spring relative to the cylindrical body. The rod is mounted in the Central hole of the annular flange with the calculated calibrated a gap relative to the surface of the stem of the rod, supplied from the camera network air flange with through holes orifice not less than the flow section of the calibrated gap and flow section through holes of the inlet into the chamber of a network of air formed by the annular flange and the cover installed with a stopper that restricts the axial movement of the rod, simply supported and fixed by the glass relative to the annular flange and a cylindrical body, and a channel connecting the camera periodically idling and the annular distribution chamber, made the piston portion of the rod. Channel V� in the form of a channel-groove with a constant geometric cross-section. Pneumatic hammer mechanism, as containing the greatest number of essential features of the proposed technical solution adopted as a prototype.

The prototype has disadvantages: constant geometric cross-section of the channel groove of the piston portion of the rod causes the same amount of air supplied into the chamber idling at the beginning and the end of the inlet when working during the step of a striker than created much back pressure of air speed and braking drummer reducing its speed before the collision with the shank of the tool and, consequently, reduction of the impact energy and impact frequency because of the increased cycle time.

The technical objective of the claimed solution is that the above mentioned disadvantages are eliminated completely or partially, if the throttle bypass channel is a groove on the lateral surface of the piston portion of the rod to perform a spiral. Noted will allow at the beginning of the air intake into the chamber idling smoothly to let in less air than to reduce its amount in the cell, to reduce the back pressure and braking, providing a speed increase speed of the impactor before impact, and therefore, the increase of impact energy and impact frequency by reducing cycle time. After hitting drummer stepped priobresti�t rebound momentum, used them at idle, which reduces the amount of intake air in the camera idling through the screw channel-groove, which when working during the step of firing pin is reduced and results in a lesser amount at the inlet to the beginning of the working stroke. As a consequence, the proposed solution can reduce the air consumption of the pneumatic impact mechanism.

By increasing the number of screw channels-grooves can significantly improve the energy parameters of a pneumatic hammer mechanism.

The essence of the proposed technical solutions pneumatic hammer mechanism is as follows: a pneumatic percussion mechanism comprising a cylindrical housing with outlet channels, an annular flange with a through Central hole, a work tool shank, stepped drummer with rod part, mounted in the Central hole of the annular flange of the rod with a piston part with a channel-groove-resident through the axial bore of the stepped pin, an annular chamber of a pneumatic buffer, bushing cylindrical body with an aperture for the passage of the stem portion formed by an annular pneumatic chamber of the buffer ring isthmus, limiting the amount of movement of supercategories, fixed relative to the cylindrical housing of glass with a channel for supplying air, an annular distribution chamber in the sleeve of the cylindrical housing, the camera network air from the annular flange, the camera idling with the sides of the shank of the working tool held by the spring relative to the cylindrical body, wherein the channel is a groove on the lateral surface of the piston portion of the rod interacting with a through axial stepped hole in the firing pin is screw.

Performance pneumatic hammer mechanism is illustrated by a drawing.

Pneumatic hammer mechanism comprises a cylindrical housing 1 mounted in it with the ability to move stepwise drummer 2 with rod part 3 and the main part 4 having a through axial hole 5, is partially included in a rod 6 with its piston part 7 of the flange 8 into the chamber 9 network air. Piston part 7 of the rod 6 is formed with a screw channel-groove 10, which provides a smooth network inlet air through the axial hole 5 speed drummer 2. Axial movement of the rod 6 restrict the annular flange 11 with the scrubbing him cover 12 and the stopper 13 of the cover. The Cup 14 secures the cover 12 relative to the annular flange 11 and the housing 1. In the annular flange 11 of the Central hole is designed so that in l�BOM position of the rod 6 grooved annular gap 15 between the rod 6 and the Central hole of the flange 11 stores the calibrated cross-sectional area of the gap and provides the network inlet of air from the chamber 9 network air the annular distribution chamber 16. Screw channel-groove 10 of the piston portion 7 of the rod 6 provides periodic intake of air into the chamber idling 17, hence the launch of the mechanism in any position.

The annular chamber 18 of the pneumatic buffer is communicated to the exhaust channel 19 in the cylindrical body 1 with the atmosphere. Camera 17 idle periodically depending on the position of the stepped drummer communicates with the atmosphere through the outlet channel 20 in the cylindrical housing 1. The annular flange 11 and the cover 12 form a chamber 9 network air network which receives the air through the channel 21 in the Cup 14 and the channels 22 in the cover 12 and further into the chamber 9 network air and through the channels 23 in the flange 8 of the rod 6 and the grooved annular gap 15 in the annular flange 11 into the annular distribution chamber 16, which is the camera of the stroke. Working tool 24 is mounted by its shank 25 in the chamber 17 of idling and is retained relative to the housing 1, for example, by a spring 26.

Pneumatic hammer mechanism works as follows. After you enable a trigger device (not shown and can be any) from the air network flows through the channel 21 in the Cup 14 and the channel 22 of the cover 12 into the chamber 9 network air. Then through the channels 23 of the flange 8 of the rod 6 and the annular grooved clearance� 15 in the annular flange 11 - the annular distribution chamber 16. From the annular distribution chamber 16 through the screw channel-groove 10, the air enters through the axial hole 5 speed drummer 2 into the chamber 17 of idling. The performance of the screw channel-groove 10 with varying length reduces the back pressure of air in the chamber idling due to low varying the amount of air in the initial period of intake using a smaller length of the screw channel-groove, which reduces the resistance to movement, keeps pretonic speed, speed drummer 2 to hit the shank 25 of the tool 24. In the position shown in the drawing, the chamber 18 of the pneumatic buffer is communicated with the atmosphere through the outlet channel 19. In the beginning of the movement speed of the striker 2, when the screw channel-groove 10 of the piston portion 7 of the rod 6 is open, continues filling air chamber 17 of idling, providing the estimated impulse idling. The air pressure in the chamber 17 idling smoothly and increases under the action of pulse pressure with her speed drummer 2 will start moving in the direction of the annular distribution chamber 16, making the idle speed. The subsequent movement speed drummer 2 opens the channel 20 in the housing 1 covers the screw channel-groove 10 of the piston portion 7 of the rod 6, and then pressure�e of the air in the chamber 17 of idling is adjusted to atmospheric. Moving, speed drummer 2 will block the outlet channel 19 and into the chamber 18 after her separation with the atmosphere will start compressing clipped in the air to some expected value. The air pressure in the annular distribution chamber 16 and increases under the action of differential pressure pulses acting on the speed of the striker 2 from the annular distribution chamber 16, chamber 18 of the pneumatic buffer chamber 17 idle speed, speed drummer 2 is retarded and stop at a settlement point. Immediately under the action of a pressure pulse of air from the annular distribution chamber 16, chamber 18 of the pneumatic speed buffer drummer 2 starts moving in the direction of the shank 25 of the working tool 24, making a stroke. At that speed drummer 2 will open the discharge channel 19 and chamber 18 of the pneumatic buffer is communicated with the atmosphere. Next step drummer 2 will block its lateral surface

the discharge channel 19, open screw channel-groove 10 of the piston portion 7 of the rod 6, whereby in the chamber 17 will start idling compression clipped in her air and air coming in small quantity from the annular distribution chamber 16. As diametrically working area of the piston portion 4 speed drummer 2 from the chamber 17 of idling b�lshe diametrically square rod parts 3 speed drummer 2, under the influence of a differential pressure pulses of air speed drummer 2, overcoming the back pressure from the chamber 17 of idling, strikes the shank 25 of the tool 24. Under the action of momentum and rebound pressure of the air from the distribution chamber 16 into the chamber 17 of idling speed drummer 2 starts idling. Further, the duty cycle of the pneumatic percussion mechanism is repeated.

Pneumatic percussion mechanism comprising a cylindrical housing with outlet channels, an annular flange with a through Central hole, a work tool shank, stepped drummer with rod part, mounted in the Central hole of the annular flange of the rod with a piston part with a channel-groove-resident through the axial bore of the stepped pin, an annular chamber of a pneumatic buffer, bushing cylindrical body with an aperture for the passage of the stem portion formed by an annular pneumatic chamber of the buffer ring isthmus, limiting the amount of movement of the stepped pin, is fixed relative to the cylindrical body of a glass channel for supplying air, an annular distribution chamber in the sleeve of the cylindrical housing, the camera network air from the annular flange, the camera Ho�chili stroke from the side of the shank of the working tool, held by the spring relative to the cylindrical body, characterized in that the channel-groove on the lateral surface of the piston portion of the rod interacting with a through axial stepped hole in the firing pin is screw.



 

Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to construction and mining, particularly, air-operated percussion tools. Percussion mechanism comprises cylindrical case with outlets, circular flange with central through bore, working tool with shank and stepped hammer with rod part. Rod with piston part is fitted in circular flange central through bore to stay permanently in thorough axial bore of stepped hammer. Pneumatic buffer has circular chamber. Cylindrical case bushing has the bore for rod part passage to make a circular web no pneumatic buffer circular chamber side that limits the stroke of steeped hammer. Cup with air feed channel is secured relative to cylindrical case. Circular distribution chamber is arranged in cylindrical case bushing while circuit air chamber is located on circular flange side. Idle stroke chamber is arranged on working tool shank retained by spring relative to cylindrical case. Channel-groove on rod piston part side surface features varying geometrical cross-section increasing from piston part side surface on rod side to the piston part end on the side of through axial bore of stepped hammer.

EFFECT: decreased counter pressure of air in idle stroke chamber, higher power of impact and frequency of impacts.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to construction and mining, particularly, air-operated percussion tools. Percussion mechanism comprises cylindrical case with outlets, circular flange with central through bore, working tool with shank and stepped hammer with rod part. Rod with piston part is fitted in circular flange central through bore to stay permanently in thorough axial bore of stepped hammer. Pneumatic buffer has circular chamber. Cylindrical case bushing has the bore for rod part passage to make a circular web no pneumatic buffer circular chamber side that limits the stroke of steeped hammer. Cup with air feed channel is secured relative to cylindrical case. Circular distribution chamber is arranged in cylindrical case bushing. Circuit air chamber is arranged on circular filter side. Idle stroke chamber is arranged on working tool shank retained by spring relative to cylindrical case. Channels-grooves are made on rod piston part side surface to interact with steeped hammer through axial bore. Said channels-grooves feature variable lengths and total area of cross-sections increasing at area from full diametrical section of rod end part to end part end in through axial bore of stepped hammer.

EFFECT: decreased idle stroke chamber air counter pressure, and resistance to hammer stroke, higher power of impact and impact frequency.

2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to construction and mining, particularly, air-operated percussion tools. Percussion mechanism comprises cylindrical case with outlets, circular flange with central through bore, working tool with shank and stepped hammer with rod part. Rod with piston part is fitted in circular flange central through bore to stay permanently in thorough axial bore of stepped hammer. Pneumatic buffer has circular chamber. Cylindrical case bushing has the bore for rod part passage to make a circular web no pneumatic buffer circular chamber side that limits the stroke of steeped hammer. Cup with air feed channel is secured relative to cylindrical case. Circular distribution chamber is arranged in cylindrical case bushing while circuit air chamber is located on circular flange side. Idle stroke chamber is arranged on working tool shank retained by spring relative to cylindrical case. Channel-flat on rod piston part side surface features varying geometrical cross-section increasing from piston part side surface on rod side to the piston part end on the side of through axial bore of stepped hammer.

EFFECT: decreased counter pressure of air in idle stroke chamber, higher power of impact and frequency of impacts.

1 dwg

The invention relates to mechanical engineering and can be used in the production of impact machines

The invention relates to mechanical engineering and can be used as a hand tool for breaking rock, concrete, lining furnaces, metal cutting shears and applied in mining and construction, as well as in the metallurgical industry

The invention relates to mining and construction

FIELD: mining.

SUBSTANCE: device includes a housing with a branch pipe having an inlet hole and an exhaust hole(s) made in the wall of the rear part, a striker installed in the housing with a possibility of being moved, a forward motion chamber formed with the branch pipe and the striker, and a reverse motion chamber, a channel in the striker for connection of forward and reverse motion chambers, and a shutoff valve. On the outer surface of the striker in its front part there is an annular groove; the housing includes an anvil. On the inner surface of the housing there is the front annular projection and a restraint of reverse motion of the striker. The shutoff valve is made in the form of an elastic ring installed in the specified annular groove of the striker so that is can interact with the inner surface of the housing. The anvil, the front annular projection and the restraint of reverse motion of the striker are made in the middle part of the housing; the elastic ring of the shutoff valve is installed so that it can interact with the inner surface of the middle part of the housing. The front part of the housing is provided with an accumulation chamber of compressed air with an isolation valve arranged in it. The forward motion chamber is interconnected with the reverse motion chamber trough this accumulation chamber; for that purpose, the latter is provided with a central tube passed into the specified channel of the striker through the hole made in the anvil for supply of compressed air from the accumulation chamber to the reverse motion chamber, and the central tube has a hole for supply of compressed air to the accumulation chamber from the main line. The isolation valve is installed on the outer surface of the central tube with a possibility of axial displacement along it and interaction of the upper end face with the striker through the specified hole made in the anvil, and the lower end face with a flange of the outer surface of the specified tube.

EFFECT: reduction of specific flow rate of compressed air by isolation of compressed air discharge to atmosphere from exhaust till end of direct motion of the striker.

6 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to construction and mining, particularly, air-operated percussion tools. Percussion mechanism comprises cylindrical case with outlets, circular flange with central through bore, working tool with shank and stepped hammer with rod part. Rod with piston part is fitted in circular flange central through bore to stay permanently in thorough axial bore of stepped hammer. Pneumatic buffer has circular chamber. Cylindrical case bushing has the bore for rod part passage to make a circular web no pneumatic buffer circular chamber side that limits the stroke of steeped hammer. Cup with air feed channel is secured relative to cylindrical case. Circular distribution chamber is arranged in cylindrical case bushing while circuit air chamber is located on circular flange side. Idle stroke chamber is arranged on working tool shank retained by spring relative to cylindrical case. Channel-groove on rod piston part side surface features varying geometrical cross-section increasing from piston part side surface on rod side to the piston part end on the side of through axial bore of stepped hammer.

EFFECT: decreased counter pressure of air in idle stroke chamber, higher power of impact and frequency of impacts.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to construction and mining, particularly, air-operated percussion tools. Percussion mechanism comprises cylindrical case with outlets, circular flange with central through bore, working tool with shank and stepped hammer with rod part. Rod with piston part is fitted in circular flange central through bore to stay permanently in thorough axial bore of stepped hammer. Pneumatic buffer has circular chamber. Cylindrical case bushing has the bore for rod part passage to make a circular web no pneumatic buffer circular chamber side that limits the stroke of steeped hammer. Cup with air feed channel is secured relative to cylindrical case. Circular distribution chamber is arranged in cylindrical case bushing. Circuit air chamber is arranged on circular filter side. Idle stroke chamber is arranged on working tool shank retained by spring relative to cylindrical case. Channels-grooves are made on rod piston part side surface to interact with steeped hammer through axial bore. Said channels-grooves feature variable lengths and total area of cross-sections increasing at area from full diametrical section of rod end part to end part end in through axial bore of stepped hammer.

EFFECT: decreased idle stroke chamber air counter pressure, and resistance to hammer stroke, higher power of impact and impact frequency.

2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to construction and mining, particularly, air-operated percussion tools. Percussion mechanism comprises cylindrical case with outlets, circular flange with central through bore, working tool with shank and stepped hammer with rod part. Rod with piston part is fitted in circular flange central through bore to stay permanently in thorough axial bore of stepped hammer. Pneumatic buffer has circular chamber. Cylindrical case bushing has the bore for rod part passage to make a circular web no pneumatic buffer circular chamber side that limits the stroke of steeped hammer. Cup with air feed channel is secured relative to cylindrical case. Circular distribution chamber is arranged in cylindrical case bushing while circuit air chamber is located on circular flange side. Idle stroke chamber is arranged on working tool shank retained by spring relative to cylindrical case. Channel-flat on rod piston part side surface features varying geometrical cross-section increasing from piston part side surface on rod side to the piston part end on the side of through axial bore of stepped hammer.

EFFECT: decreased counter pressure of air in idle stroke chamber, higher power of impact and frequency of impacts.

1 dwg

FIELD: machine building.

SUBSTANCE: percussion mechanism includes a cylindrical housing with a sleeve and outlet channels, a working tool with a shank, a stepped piston with stock and main parts with a central channel and a sleeve with a longitudinal channel-slot and a hole in the stock part of the piston, which divides the cylindrical housing cavity into an annular chamber on the side of stock part of the piston, an idle stroke chamber on the side of the working tool shank and an annular distributing chamber in the sleeve of the cylindrical housing on the side of the piston stock part, an annular flange with air supply holes to the annular distributing chamber and a through axial channel for passage of the rod with a shutoff valve, a fastening shell fixed relative to the cylindrical housing, a network air chamber formed with the shell with and air supply channel and an annular flange, which is fixed in the through axial channel of the annular flange, the rod with the shutoff valve that constantly interacts with a longitudinal channel-slot in the hole of the sleeve located in the central channel of the piston, which connects periodically, depending on position of the stepped piston, the annular distributing chamber and the idle stroke chamber to each other. In the section of interaction of the annular stage of the cylindrical housing sleeve with the stock part of the piston there is an annular gap with a design flow cross-section, and on stock part of the piston there is a throttling bypass channel-slot that constantly connects the annular distributing chamber to the annular chamber.

EFFECT: excluding distortions of the rod with the shutoff valve and increasing their life time; providing required amount of air in design mode of operation of a supply mechanism for creation of a design power pressure pulse of air on the side of the annular working stroke chamber.

7 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: mechanism includes a cylindrical housing with a sleeve and outlet channels, a working tool with a shank. A stepped piston with stock and main parts with a central channel and a sleeve with a longitudinal channel-slot and a hole in a stock part of the piston, which divides the cylindrical housing cavity into an annular distributing chamber in the sleeve of the cylindrical housing on the side of stock part of the piston and the idle stroke chamber on the side of the working tool shank. An annular flange with air inlet holes to the annular distributing chamber and a through axial channel for passage of a rod with a shutoff valve, a fastening shell fixed relative to the cylindrical housing. Network air chamber is formed with a fastening shell with an air supply channel and an annular flange fixed in the through axial channel of the annular flange, the rod with the shutoff valve, which constantly interacts with the longitudinal channel-slot in the hole of the sleeve located in the central channel of stepped piston, which connects periodically, depending on position of the stepped piston, the annular distributing chamber and the idle stroke chamber to each other. In the section of interaction of the annular stage of the cylindrical housing sleeve with the stock part of the piston there is an annular gap with a design flow cross-section, and on inner side surface of the sleeve there is a throttling bypass channel-slot along a generatrix, which constantly connects the annular distributing chamber to the annular chamber.

EFFECT: increasing total power pressure pulse of air at idle stroke; increasing single percussion energy.

6 cl, 1 dwg

FIELD: construction.

SUBSTANCE: pneumatic device of impact action includes a cylindrical body with a bushing and outlet channels, a working tool with a tail, a stepped piston with stem and main parts with a central channel and a bushing with a longitudinal channel-slot and a hole in a stem part of the piston, which separates the cavity of the cylindrical body into a circular distribution chamber in the bushing of the cylindrical body at the side of the stem part of the piston and an idle chamber at the side of the working element tail, a circular flange with holes of air supply into the circular distribution chamber and a through axial channel for passage of a rod with a stop valve, a fastening sleeve fixed relative to the cylindrical body, a network air chamber formed by the fastening sleeve with the air supply channel and the circular flange, a rod with a stop valve fixed in the through axial channel of the circular flange, which continuously interacts with the longitudinal channel-slot in the hole of the bushing arranged in the central channel of the stepped piston, which connects from time to time, depending on the stepped piston position, the circular distribution chamber and the idle chamber to each other. In the section of interaction of the circular stage of the bushing of the cylindrical body with the stem part of the piston there is a circular gap with a rated throughput section, and on the inner side surface of the bushing there is a throttling helical channel-slot arranged along its entire length, which continuously communicates the distribution chamber with the circular chamber.

EFFECT: possibility to increase summary power impulse of air pressure in case of a working stroke, thus increasing energy of a single impact.

6 cl, 1 dwg

FIELD: construction.

SUBSTANCE: pneumatic impact mechanism is designed for application in impact machines of different purpose. It comprises a cylindrical body with a bushing and outlet channels, a working tool with a tail, a stepped piston with stem and main parts with a central channel and a bushing with a longitudinal channel-slot and a hole in the stem part of the piston, which separates the cavity of the cylindrical body into a circular chamber at the side of the stem part of the piston, an idle chamber at the side of the working tool tail and a circular distribution chamber in the bushing of the cylindrical body at the side of the stem part of the piston, a circular flange with holes of air supply into the circular distribution chamber and a through axial hole for passage of a rod with a stop valve, a fastening sleeve fixed relative to the cylindrical body, a network air chamber formed by the sleeve with an air-supply channel and a circular flange, a rod with a stop valve fixed in the through axial channel of the circular flange, which permanently interacts with the longitudinal channel-slot in the hole of the bushing being located in the central channel of the piston, connecting periodically, depending on the stepped piston position, the distribution chamber and the idle chamber between each other. In the section of interaction of the circular step of the cylindrical body bushing with the stem part of the piston there is a circular gap with a rated throughput section, and on the stem part of the piston there is a throttling relief helical channel-slot, which permanently communicates the distribution chamber with the circular chamber.

EFFECT: invention makes it possible to avoid warps of a rod with a stop valve and to increase their resource; in the rated mode of mechanism operation, to provide for supply of required air amount to create a rated power pulse of air pressure from the side of a circular chamber of working travel.

6 cl, 1 dwg

FIELD: construction.

SUBSTANCE: pneumatic impact mechanism comprises a cylinder with outlet channels, a working tool with a tail, a stepped striker with a stem and a main parts with a central through channel and a bushing with a slot channel in the stem part of the striker, separating the cylinder cavity into an idle chamber at the tail side, a distribution chamber at the side of the stem part of the striker, a circular chamber of a forward stroke, a network air chamber, a circular cover installed between the network air chamber and the distribution chamber with a channel of air supply from the network air chamber into the distribution chamber, a rod rigidly fixed relative to the cover with a piston part, which is permanently installed in a central through channel of the striker, interacting with the slot channel of the bushing, connecting periodically, depending on the position of the stepped striker, the distribution chamber and the idle chamber between each other. The distribution chamber and the circular chamber of the forward stroke are permanently communicated to each other with a circular throttling channel, coaxially to the distribution chamber there is a sleeve installed, forming an additional circular chamber of an attached volume, permanently communicated with a relief channel to the circular chamber.

EFFECT: reduced back pressure of striker braking at an idle moment, reduced recoil force acting at a cylinder.

1 dwg

FIELD: construction.

SUBSTANCE: device comprises a hollow body with a stepless striker having a central through hole separating the body cavity into working and idle chambers, a central tube interacting with the central through channel of the striker, a bushing with a permanently open inlet channel and a hose to supply compressed air from a network, a cover with a hole to let through the central tube, a prechamber of network air, a tail entering the idle chamber, the tail and the bushing are arranged with through channels to let through the central tube sealed and fixed relative to the tail and the bushing, in the central tube there is an additional tube installed coaxially with a circular gap with a radial outlet channel and with fixation along its ends relative to the central tube. In the additional tube there are slots sealed and coupled with the surface of the central tube, forming at the same time a separately longitudinal throttling channel of air inlet into the idle chamber, and an air outlet channel from working and idle chambers, besides, the longitudinal throttling channel at the side of the idle chamber and the prechamber is equipped with radial channels in the central tube.

EFFECT: increased power pressure pulses at the side of the working and idle chamber and increased kinetic energy of a strike.

2 dwg

FIELD: building and mining percussion action machines, possibly development of manual pneumatic hammers in machine engineering, heavy duty pneumatic percussion action machines for breaking rocks and frozen grounds.

SUBSTANCE: in pneumatic hammer with throttle type air distribution between wall of sleeve and outer lateral surface of cylinder there is annular non flow-through afterburner. Boost ducts providing cyclic communication of afterburner with working-stroke chamber are made in the form of radial ducts in wall of cylinder. Spacing between end of cover turned to working-stroke chamber and cut-off edge of cut of boost duct at side of adjacent outlet duct is cyclically closed by means of striker and it is less than length of striker. Cover has additional throttling calibrated duct for mutual communication of constant distributing-network chamber with non flow-through afterburner.

EFFECT: improved design providing increased percussion power of hammer, increased energy of single percussion.

5 cl, 4 dwg

FIELD: percussion action building and mining machines, possibly development of manual pneumatic hammers in machine engineering, heady-duty pneumatic percussion action machines for breaking rocks and frozen grounds.

SUBSTANCE: in pneumatic hammer with throttle type air distribution surfaces engaging one to other are provided with annular turnings. The last are arranged in portions of mounting surfaces of striker and tube in such a way that length values of turning portions along generatrix are less than length values of generatrix portions of mounting surfaces of striker at side of cylinder and at side of tube.

EFFECT: increased percussion power of hammer, increased energy of single shock.

9 cl, 16 dwg

FIELD: engines and pumps.

SUBSTANCE: air hammer incorporates a hollow cylinder, a striker with a central channel arranged inside the aforesaid hollow cylinder and dividing it into idling and operating stroke chambers, a movable pipe with an always-open inlet throttle channel, a thrust collar and a step, a cover with a collar and a hole, the cylinder barrel and working tool. The movable pipe passes through the striker central channel to communicate the air line chamber with the idling chamber via the aforesaid always-open inlet throttle channel. The movable pipe thrust collar represents an annular barrel with a limiting annular collar resting on the cover. An circular boosting chamber is formed between the cylinder barrel side surface and the cover collar. The annular barrel is furnished with one or several through throttle channels with a designed flow section. The cylinder walls are provided with the boosting radial channels communicating the annular boosting chamber with the idling chamber. The cover collar incorporates a throttle channel intercommunicating permanently the air line and boosting chambers.

EFFECT: operating chamber pressure increase approximating to air line chamber pressure.

25 cl, 4 dwg

FIELD: engines and pumps.

SUBSTANCE: air-operated device incorporates an air line chamber, a hollow cylinder with its side wall furnished with outlet channels, a striker arranged in the said hollow cylinder and dividing it into idling and operating chambers, a cover, a barrel, a pipe with always-open throttle channel and an operating tool. The inlet throttle channel communicates the air line chamber with the idling chamber. A non-through boosting chamber is arranged in the cylinder wall on the idling chamber side. The striker is furnished with inner and outer chambers-grooves representing an alternating ledges and recesses their outline being formed by straight or curvilinear lines and with a bypass channel for the inner and outer chambers-grooves to intercommunicate. The aforesaid pipe side surface is furnished with a radial channel representing a vertical slot to intermittently communicate the said chambers-grooves in the striker with the pipe inlet throttle channel. The latter incorporates a cut-in channel-throttle arranged on the tool side.

EFFECT: higher efficiency impact on medium being processed.

2 dwg

FIELD: mechanics.

SUBSTANCE: proposed perforator comprises a casing with an air feed inlet, cylinder communicating with the aforesaid inlet via an appropriate system of air ducts, impact action piston with at least one part making an interface with the aforesaid cylinder, air flow control appliances and water feed inlet. Note also that the perforator incorporates at least one pair of contact surfaces whereon appropriate parts moving relative each other get into contact. The said impact action piston can reciprocate inside the aforesaid cylinder. The proposed device comprises water channels communicating with the aforesaid water feed inlet, as well as those feeding water or air saturated with water during perforator operation to, at least, aforesaid interface between the impact action piston and the cylinder for wetting that is lubing the said contact surfaces.

EFFECT: perforator operation without lubricants.

28 cl, 8 dwg

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