The pneumatic hammer
The invention relates to mechanical engineering and can be used in the production of impact machines. The hammer includes a handle, the air-distributing mechanism, barrel with a Central channel, the drummer, the casing of the muffler, the end part comprising an end cap, a working tool, springs, rubber shock absorber. The handle is provided with a valve consisting of a reading of a limb, angular Vernier, fixing disk, screws, springs, Cams, valve, channels: input, output, and communication channels that connect the chamber, separating the handle and the housing, with the source of compressed air and the atmosphere. The invention allows to change the pressing force of the operator on the hammer and maintain during operation is almost constant air pressure in the chamber, separating the handle and the housing, thereby reducing the vibration transmitted from the hammer to the operator. 2 Il.
The invention relates to mechanical engineering and can be used in the production of impact machines.
Known hammer drill of the type MO (see Pneumatic hand machine. Reference /Kunitsyn, I. and et - L: mechanical engineering, 1968) containing the tool housing with the barrel, the drummer.
The lack of t of the high level of vibrations.
The closest in technical essence is the pneumatic hammer (see U.S. Pat. RU # 2172667, IPC 7 25 D 9/14, 9/26, E 21 37/24, 2001), including the handle, spring, body, barrel, firing pin tool. The barrel is installed in the housing for axial movement in two cylindrical bands, dividing the space between the casing and the barrel on the three cameras, the average of which is connected with a source of compressed air, and the two extreme camera is constantly communicated with the atmosphere. The barrel is made with two rows of holes connecting the inner cavity of the barrel with the outer surface. The diameter of the front, located closer to the tool belt is larger than the diameter of the rear belt and the outer surface of the barrel is made correspondingly stepped. The inner cavity of the barrel and the surface of the striker performed stepwise, with drummer divides the cavity of the trunk on three cameras, with the front communicated with the atmosphere, and the middle and rear chambers communicated with the outer surface of the barrel.
The disadvantages of the prototype are: 1) the operator does not have the ability to change the force of pressure on the hammer; 2) the spring that separates the handle and the housing, when the oscillation frequency is inefficient prevents the transfer of vibration operatonal value of impact force on the hammer and ensures that during operation of the machine constant air pressure in the chamber, separating the handle and the body.
The technical result - dampening vibrations transmitted to the operator, the efforts of the pressure on the hammer.
Solving these problems is achieved by the fact that in the known device, containing the handle, the air-distributing mechanism, barrel with a Central channel, the drummer, the casing of the muffler, tail piece, consisting of a working tool, springs, rubber shock absorber, according to the invention the handle is provided with a valve consisting of a reading of a limb, angular Vernier, fixing disk, screws, springs, the camera, which moves the spool, channels: input, output, and communication channels that connect the chamber, separating the handle and the housing, with the source of compressed air. The device allows you to change the force of pressure on the hammer and maintain during operation, the constant pressure of compressed air in the chamber, separating the handle and the body.
Held by the applicant for patent search has allowed to establish that the applicant had not discovered similar, characterized by signs, identical with all the essential features of the claimed invention. The definition of the list of identified unique prototype as closest in essential picscom result of the distinctive features in the claimed device, set forth in the claims.
Therefore, the claimed invention meets the condition of “novelty.”
To verify compliance of the claimed invention the term “inventive step”, the applicant conducted an additional search of the known solutions to identify signs that match the distinctive features of the prototype of the characteristics of the claimed device. Search result showed that the claimed invention not apparent to the expert in the obvious way from the prior art because the prior art defined by the applicant, not identified provided the essential features of the claimed invention transformations to achieve a technical result.
Therefore, the claimed invention meets the condition of “inventive step”.
The invention is illustrated by drawings. In Fig.1 shows part of the device in section, in Fig.2 presents its end part.
The pneumatic hammer (Fig.1) includes a handle 1, a body 2 with a Central channel 3, the striker 4, the air-distributing device 5, which is pressed against the housing cover 6, the end part (shown in Fig.2), the casing of the muffler 7. On the outer side of the cover 6 air distributing mechanism is put in mechanism of the air distribution chamber 8. On the inner surface of the handle is made of a cylindrical recess 9. The handle is provided with a valve 10, which consists of reading the limb 11, the angular Vernier 12, the locking disk 13, the screw 14, the spring 15, the chamber 16, valve 17 and a recess 18, channels: input 19 output 20, a communication channel 21. The handle and the housing form a chamber 22. On the handle are attached to the fitting 23, the rubber damper 24, the retaining ring 25 with a rubber shock absorber 26. At the end of the body 2 is attached Buchs 27 (Fig.2). The end part consists of end cap 28, the working tool 29, a spring 30, a rubber shock absorber 31 and steel bushings 32.
The device operates as follows. Before operation, the operator sets the reference limb 11 of the valve 10 in a certain position relative to the angular Vernier 12. This position of the limb is fixed a disk 13, which prevents inadvertent rotation of the limb. During the rotation of the limb screw 14 changes the compression spring 15. Compressed air through the nozzle 23, the recess 9, the input channel 19, the recess 18 of the valve 17, the communication channel 21 enters the chambers 16 and 22. Under the action of compressed air in the chamber 22, the lever 1 is shifted relative to the cover 6 in the position indicated in Fig.1. With increasing pressure in the chamber 16 of the valve 17, overcoming OCI tool compressing the spring, is displaced relative to the housing. As soon as the force of pressure of the operator on the handle will exceed the pressure of the compressed air, there will be displacement of the handle relative to the housing. The offset arm leads to a shift of the spool 17 of the valve 10, as, for example, reducing the volume of the chamber 22 increases the pressure in the chamber 16. The displacement of the slide valve 17 up excess air from the chamber 22 through the output channel 20 is displaced into the atmosphere. When moving the handle recess 9 will be against the camera 8. Compressed air will flow into the air-distributing device 5. Drummer 4 hammer will come into motion.
If the drummer does a direct course, the body of the hammer acts reaction force directed in the direction opposite to the movement of the striker. Under the action of this force, the housing moves relative to the arm, reducing the volume of the chamber 22. The valve 10 connects the chamber 22 to the atmosphere. When the displacement of air from the chamber 22 it is supported by almost constant pressure. The energy acquired by the body from the work force is extinguished by operation of gravity of the hull and the pressure of the compressed air in the chamber 22 on the body.
When the drummer does a reverse gear, the housing moves relative to the arm in the counter is such from the network through the input channel 19, the recess 18 of the valve 17 through the communication channel 21 will flow into the chamber 22. The valve 10 is again supported in the chamber 22 is practically constant pressure.
When a drummer direct and reverse valve provides a nearly constant pressure in the chamber 22, and achieve a high efficiency of absorbing vibration transmitted to the operator. This efficiency is greater, the smaller the pressure drop in the chamber 22 during the transition from direct to reverse the course of the drummer. Discuss the device in operation can provide a varying force transmitted to the operator, on 5-10% of the value of the pressure.
The valve 10 allows you to change the pressing force on the hammer. So, for example, to increase the force pressing need by turning the limb valve to increase the compression spring 15, which will lead to an increase in the pressure in the chamber 22, whereby the valve will block the flow of air in this chamber. When changing the pressure and the position of the hammer relative to the normal to the surface of the Earth changes the external resultant force (a force pushing plus the projection of the gravity of the case with grip for the longitudinal axis of the hammer) acting on the body. This force has an effect on the impact energy and the amplitude of the oscillations of the case. N is as up to 7%.
The coefficient of elasticity and the size of the spring end portion must ensure the displacement of the tool relative to the body before working on the magnitude of the maximum stroke of the housing. Then, during operation of the hammer, despite the movement of the body, the tool remains in contact with the object of influence.
The pneumatic hammer, containing the handle, the air-distributing mechanism, barrel with a Central channel, the drummer, the casing of the muffler, the end part comprising an end cap, a working tool, springs, rubber shock absorber, characterized in that the handle is provided with a valve consisting of a reading of a limb, angular Vernier, fixing disk, screws, springs, Cams, valve, channels: input, output, and communication channels that connect the chamber, separating the handle and the housing, with the source of compressed air and the atmosphere.
FIELD: pneumatic percussion apparatuses designed, mainly for trench-free replacement of old pipelines and laying new ones, methods for controlling air distribution in such apparatuses.
SUBSTANCE: in pneumatic percussion apparatus surface areas of annular cross sections of striker at side of inner and outer chambers are almost the same. Spacing between outer end of striker and axis of openings of striker and striker stroke are selected according to condition that they are almost equal to half values of distances between axis of openings of striker and inner end of striker and between outer end of striker and its inner end respectively. In such apparatus air flows are distributed between working chambers and exhaust ducts by means of mechanical members. In order to provide operation of apparatus in mode of back exhaust, working chamber of back stroke of striker is communicated with atmosphere through outer chamber and inner chamber is communicated with pneumatic main line. In order to provide operation of apparatus in mode of front exhaust, working chamber of reverses stroke of striker is communicated with atmosphere and outer chamber is communicated with pneumatic main line.
EFFECT: enlarged range of using, enhanced operational reliability, simplified operation of apparatus, air distribution process providing exhaust of waste air in backward and forward directions in pipeline depending upon technical needs.
10 cl, 7 dwg
FIELD: building equipment, namely percussion action pneumatic apparatuses designed for trench free placing and changing underground pipelines.
SUBSTANCE: pneumatic apparatus includes: stepped branch pipe closed at side of striker and provided with lateral openings; idle stroke chamber restricted by inner surface of striker and outer surface of stepped branch pipe and steadily communicated with compressed air source; working stroke chamber restricted by back end of striker, inner surface of housing and outer surface of stepped branch pipe, cyclically communicated with compressed air source and with exhaust chamber. Exhaust chamber is restricted by inner surface of housing, outer and inner surfaces of striker and it is steadily communicated with atmosphere.
EFFECT: enhanced operational reliability, increased energy of single percussion and useful life period of apparatus.
FIELD: manual percussion action pneumatic machines, particularly vibration-insulated handles, possibly used in building, machine engineering and other industry branches.
SUBSTANCE: handle of pneumatic percussion action machine includes housing in upper part of which air supply rod is mounted. In housing there is rod with piston embracing air supply rod with possibility of motion along it. Rod with piston divides cavity of housing to over-piston and under-piston chambers. Piston of rod has lengthwise duct for communicating over-piston and under-piston chambers of housing. There is radial opening in lateral surface of housing rod for cyclic communication of network of compressed air with over-piston chamber of housing cavity. In power part of housing stepped sleeve is fit at radial gap on rod with piston. In lateral surface of small step of said sleeve there is draining throttling opening designed for cyclic communication of over-piston chamber through lengthwise duct of piston with atmosphere. Stepped sleeve may be mounted in housing on shock absorber, for example on rubber shock absorber and it may perform restricted axial motion in range of elasticity of shock absorber.
EFFECT: enhanced operational safety due to locking shocks at handling machine from one cell to other in casting flask.
2 cl, 2 dwg
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.
5 cl, 4 dwg, 1 ex
FIELD: machine engineering.
SUBSTANCE: percussion action machine includes housing; working tool holder; guiding cylinder where percussion mechanism with striker is arranged; device for holding striker in front position near working tool holder at idle stroke of percussion action machine. Said device includes slit springy ring having non-uniform along its perimeter cross section whose area reduces towards slit.
EFFECT: enhanced reliability of holding striker in front position and therefore improved operational reliability of the whole percussion action machine.
4 cl, 6 dwg
FIELD: machine engineering, namely percussion-action pneumatic machines.
SUBSTANCE: machine includes housing where metallic trunk is arranged; striker arranged in trunk with possibility of axial motion for dividing truck by chambers of forward and back strokes; bushing; mechanism for air distributing; handle; shock absorber of soft elastomer mounted inside handle. Air distributing mechanism has supplying, forward pumping and backward pumping ducts. Protection casing is arranged on housing with annular cavity between them. Trunk has at least three links telescopically mounted with possibility of relative axial motion without mutual striking and cast with impact-resistant elastomer forming housing. Ducts formed in walls of housing are designed for communication with forward-stroke chamber; other ducts are designed for communication at one side with back-stroke chamber and at other side with pumping reverse ducts of air distributing mechanism. Third ducts are designed for communication with said annular cavity. Bushing, air-distributing mechanism, protection casing and handle are made of impact-resistant different rigidity elastomer.
EFFECT: improved design providing vibration resistance, lowered noise level, enhanced operational efficiency, lowered mass of machine.
3 cl, 3 dwg
SUBSTANCE: inertial-impact tool comprises casing, impact tool, impact tool pneumatic-spring drive, shock absorber and control element. Aforesaid shock absorber comprises a weight moving to reaction force transmission position and gets into contact with impact tool. Flexible element is designed to absorb reaction force in the aforesaid weight motion. Impact of flexible element on the said weight is prevented by the said control element. The weight can be in ether a direct contact with the impact tool or via an intermediate element. Pneumatic spring drive element is arranged to move from working into idle positions.
EFFECT: reduced vibration of inertial-impact mechanism.
10 cl, 17 dwg
SUBSTANCE: proposed pneumatic machine comprises a barrel-casing made up of at least three telescopic three parts, i.e. a dynamic, inertial and damping filled with shock-proof and heat-resistant elastomer, an axial handle, a radial handle and intermediate part. The aforesaid barrel accommodates a striker reciprocating therein and is provided with slots. The intermediate part is attached onto the barrel end face and arranged in the said axial handle. The damping part is mounted between the dynamic and inertial parts in axial direction. The dynamic part is arranged in the inertial part to form a circular gap filled with elastomer. The damping part is arranged behind the inertial part and is made from the shockproof and heat-resistant elastomer in the form of the casing extension. The intermediate part features a cylindrical surface with a collar made thereon. The said axial handle has an inner cylindrical surface with a mating collar. The intermediate part is arranged inside the inner cylindrical surface of the axial handle to form therein a quasi-closed damping chamber. The intermediate part outer end face surface has a coaxial cylindrical tail accommodating a starting mechanism plunger. The axial handle bottom has a cylindrical cup to interact with the said cylindrical tail.
EFFECT: higher antivibration safety and reliability.
2 cl, 3 dwg
FIELD: technological processes.
SUBSTANCE: invention relates to electric driving tool with mechanism of vibration control. Tool comprises body, electric motor, mechanism of motion transformation, counterbalance holder, counterbalance and support elements. Electric motor is installed in body. Mechanism of motion transformation serves for transformation of rotary motion of electric motor into reciprocal motion. Counterbalance holder passes in direction, which is perpendicular to directions of reciprocal motion and may elastically deform in directions of reciprocal motion. Counterbalance is supported by holder of counterbalance and is able to execute reciprocal motion in directions of reciprocal motion together with counterbalance holder. To provide support to counterbalance holder, support elements are arranged at previously specified distance from the counterbalance. Counterbalance is installed between support elements or among them.
EFFECT: reduced vibration, and device dimensions are not increased.
19 cl, 22 dwg