Pneumatic impact device

 

Pneumatic impact device relates to mining and construction equipment. The device comprises a hollow body, a striker adapted to control the exhaust, the camera forward and reverse. At least one of these chambers is provided with a means dosed feed it with compressed air exhaust duct and the exhaust valve to provide a free air displacement of the camera moving drummer. The exhaust valve is made in the form of an elastic sealing ring placed on the drummer with the ability to interact with a fragment of the inner surface of the housing, limiting this camera. The fragment is executed in the form of a stepped cylinder with a smooth pair of steps. The diameter of the small stage matches the outside diameter of the exhaust valve on the drummer. Before changing the direction of motion of the striker enters the valve at the low stage cylinder, providing a preliminary sealing of the camera and clear the closing of the exhaust valve. This solution makes it possible to improve the start-up and to increase the energy performance of pneumatic hammers. 3 C.p. f-crystals, 4 Il.

The device relates to mining and construction technology is tov, etc.,

Known pneumatic percussion mechanism according to the author's certificate of the USSR, 998740, CL E 21 3/24, publ. 23.02.83, BI No. 7. The mechanism includes a hollow body, the drummer, the camera forward and reverse. Each of these chambers is provided with a means dosed supply of compressed air and the exhaust channel, managed by the drummer. To relieve back pressure during reverse motion of the striker Luggage forward stroke is further provided with an outlet valve in the form of an elastic sealing ring. The elastic sealing ring is placed on the bushing inside the housing and adapted to overlap the annular gap release compressed air from the chamber forward stroke into the atmosphere. The annular gap formed by the radial clearance between the elastic ring and the inner surface of the housing. The overlap of the annular gap valve is provided by the compressed air in the chamber forward stroke. This creates an end-to-end thread: main - camera - circular slot - like atmosphere. To close the valve, it is necessary that the resulting differential pressure on the elastic ring is able to stretch, to choose the radial gap and pressed to the body.

The disadvantage of the mechanism is the need to create a large instantaneous flow rate of compressed air Caudalie at flybacks drummer throttle cross section annular gap must be significant. Therefore, in order to create a pressure differential capable of radially deforming the elastic sealing ring and close the valve, the compressed air must be intense. The need for intensive compressed air to close the valve eliminates the possibility of a smooth start of the engine and determines the sensitivity of the mechanism to decrease pressure on the network.

The closest technical solution and the achieved effect is the percussion device according to the Russian patent 2105881, CL E 21 3/24, F 02 F 5/18, publ. 27.02.98, BI No. 6.

The device comprises a hollow body, the drummer, the camera forward and reverse. The back-stroke chamber provided with a means dosed feed it with compressed air exhaust channel managed by the drummer and the exhaust valve. The exhaust valve is made in the form of resistant sealing ring of elastic material. The retaining ring is placed on the drummer with the ability to interact with the inner surface of the housing. The diameter of this surface more than the outer diameter of the thrust ring on the drummer. The gap between them forms a circular slot for release of air displaced by the drummer from the camera to reverse into the atmosphere when the direct course of the drummer. On. the end of the forward stroke of the striker presses resistant sealing ring to ring fence. Mechanical closing resistant sealing ring and the annular stop leads to overlapping annular gap cleaning camera-reverse and provides pre-sealing. This creates favorable conditions for increasing the pressure in this chamber to ensure radial deformation resistant o-rings and pneumatic closing of the exhaust valve. Thus, closing of the exhaust valve is achieved here without creating an intense end-to-end flow through the annular gap. This improves the launch of the device, increases the resistance of his work and reduces the loss of compressed air.

The disadvantage of this device impact is hard to bind the coordinates of the point of impact to position the annular stop on the housing. Significant overrun or adobeg of the striker relative to the annular emphasis here is invalid. This system is not applicable for many kinds of percussion machines, where the shock is perceived movable relative to the housing tools: spade, chisel, drill crown, etc. also incorporated in this device hard link in this system for a camera forward stroke, because this camera provides smooth braking and acceleration of the striker, and the point of direction change significantly shifted depending on changes to the network pressure, changes in the rebound drummer from tool and so on

The technical problem which is solved by the proposed device is to provide a clear closing the exhaust valve without limiting the freedom of movement of the striker and the need for intensive flushing of the working chamber.

We offer pneumatic percussion device comprises a hollow body, a striker adapted to control the exhaust, the camera backward and forward movement, at least one of which is equipped with means dosed feed it with compressed air exhaust channel and an outlet valve in the form of an elastic sealing ring. The exhaust valve is placed on the drummer with the ability to interact with a fragment of the inner surface of the casing bounding the chamber.

The technical problem is solved by the fact that the specified portion of the inner surface of the case is made in the form of a stepped cylinder with a smooth pair of steps. The diameter of the small stage matches the outside diameter of the exhaust lipananai camera.

Thanks to this performance of the device is changing the work of the resilient exhaust valve and the pre-sealing of the camera with which it is equipped. Exhaust valve here is not exposed end clamped between the casing and the drummer. When the movement of the striker in the direction minimizing the volume of this chamber, the exhaust valve freely introduced drummer in a small step of the stepped cylinder. Where compliance with the diameter of the small stage outside diameter of the exhaust valve provides radial overlap of the annular gap cleaning the chamber and pre-sealing. At the same time, there is still the possibility of further axial movement of the outlet valve with the drummer inside of the stepped cylinder. It is thus guaranteed that the effect of considerably improving conditions for closing the exhaust valve without limitation of movement of the striker.

The described embodiment of the device allows without loss of energy to significantly reduce the back pressure that prevents movement of the striker in the boost phase of the business cycle. Ceteris paribus this improves the energy performance of a pneumatic impact device, increases its efficiency.

EU pairing steps, which is adapted to engage the exhaust valve, it will improve working conditions, the exhaust valve will increase its durability. The exhaust channel can be made in the drummer.

If between exhaust valve and drummer to place the ring with a collar and the fit of the ring on the drummer to perform with radial clearance, and landing the exhaust valve on the ring with a radial interference fit and the diameter of the collar to perform the corresponding outside diameter of the exhaust valve, it will reduce the sensitivity of the device to wear a pair of drummer - case.

In Fig.1 schematically shows a pneumatic impact device with valve and is adapted to interact with a fragment of the inner surface of the camera-reverse, made in the form of a stepped cylinder with a smooth pair of steps. The upper part of the drawing corresponds to the position of drummer in the beginning of the forward stroke, the lower half of the drawing, the drummer is depicted at the end of the forward stroke.

In Fig.2 shows the device with the valve and is adapted to interact with a fragment of the inner surface of the camera forward stroke.

In Fig.3 - the device with the placement of the exhaust channel outside of the fragment vnutrennikh exhaust valve using the intermediate ring.

Pneumatic impact device (Fig.1) includes a hollow body 1, the striker 2, the camera forward stroke 3, the back-stroke chamber 4, the exhaust chamber 5, the exhaust valve 6 in the form of an elastic sealing ring. The housing 1 has an inlet opening 7, the exhaust air channel 8 and the hole 9 under the working tool 10. The drummer 2 has a circular collar 11, which forms the end support wall exhaust valve 6. The exhaust valve 6 is adapted to interact with a fragment of the inner surface 12 of the housing 1, limiting the back-stroke chamber 4. Fragment 12 is a stepped cylinder, including a big step 13, a small stage 14, a plot of their smooth pair 15. Stepped cylinder is oriented small stage 14 in the direction of movement of the striker 2, in which there is a reduction of the volume of the chamber 4, in this case toward the forward stroke of the striker 2. In drummer 2 has the throttle channel 16, continuous, dosed supply of compressed air from the chamber 3 in the back-stroke chamber 4. The drummer 2 has longitudinal grooves 17. Centering drummer 2 in the housing 1 is provided with a cylindrical surface 18.

Pneumatic impact device (Fig.2) includes a hollow body 1, stupenda ring 6. In the housing 1 has an inlet opening 7, the exhaust air channel 8 and the drain opening 19 reporting rod cavity 20 with the atmosphere; the channels 21, 22, 23 camera power forward stroke 3. Metered flow of compressed air into the chamber forward stroke 3 is a two-position distributor 24 and pneumatic control. The exhaust valve 6 is adapted to interact with a fragment of the inner surface 12 of the housing 1, limiting the camera forward stroke 3. Fragment 12 is a stepped cylinder, including a big step 13, a small stage 14 and plot a smooth pair 15. Stepped cylinder is oriented small stage 14 in the direction of movement of the striker 2, in which there is a reduction of the volume of the chamber forward stroke 3. Step drummer 2 has a cut-off edge 25.

Pneumatic impact device (Fig.3) may include a stepped socket and short circuits 26 and cutting edge 27, the discharge opening 28, and is also available in drummer 2 exhaust channel 8.

Between the fitting surfaces of the striker 2 and the housing 1 (Fig.4) may form a gap 29. The exhaust valve 6 can be mounted on the striker 2 using intermediate ring 30. Between the intermediate ring it outside diameter of the exhaust valve 6.

Pneumatic impact device (Fig.1) works as follows. Under the action of the net pressure PMcompressed air entering through the inlet 7 into the chamber forward stroke 3, the striker 2 is moved forward (to the left in the drawing). When the movement of the striker 2, the air from the chamber reverse 4 freely displaced through the slots 17, then through the annular gap between the big stage 13 and the exhaust valve 6 and finally through the exhaust channel 8 into the atmosphere. Before the blow of the striker 2, the tool 10 exhaust valve 6 is introduced drummer in a small stage 14. Since the diameter of the small stage 14 corresponds to the outer diameter of the exhaust valve 6 on the striker 2, the radial clearance between the exhaust valve 6 and the inner cavity of the housing 1 sharply decreases, respectively, reduces pretechka from reverse camera 4 into the atmosphere. The feed from the camera forward stroke 3 through the throttle 16 provides a rapid pressure buildup in the back-stroke chamber 4 and the radial deformation of the valve 6, i.e., pneumatic closing of the exhaust valve. A possible axial displacement of the end face of the tool 10 relative to the housing 1 does not cause problems. Just changing the stroke of the striker 2, the exhaust valve 6 in premery forward stroke 3, then under the action of pressure in the back-stroke chamber 4 after hitting the tool 10 drummer 2 starts to reverse. The pressure in the back-stroke chamber 4 presses the exhaust valve 6 to the base wall 11 and radially deforms it. The exhaust valve 6 is pressed against the surface of the fragment 12: first (in the direction of the drummer) to the surface of a small stage 14, and then to the smooth surface of the coupling 15 and then to the surface of the large step 13. After drummer 2 will move the exhaust valve 6 at the edge of the outlet port 8, the tightness of the reverse camera 4 is broken, the pressure in it drops sharply and under the force of elasticity of the exhaust valve 6 is compressed. Standing in the camera forward stroke 3 pressure PMstops drummer 2 and begins its acceleration in the direction of the tool 10. The cycle repeats.

Pneumatic impact device (Fig.2) works as follows. Under the action of the net pressure PMcompressed air is continuously supplied through the inlet opening 7 in the back-stroke chamber 4, the striker 2 starts to reverse. When the exhaust valve 6 is a big step 13 and compressed the elastic forces. The annular gap between the surface of the large stage and the outer diameter the CSOs turn 3 through the exhaust channel 8 into the atmosphere. The pressure in the chamber 3 is close to atmospheric, and the dip valve 24 is in the closed position (as shown in the diagram). After drummer 2 introduces the exhaust valve 6 in a minor step 14, the free release of air from the chamber 3 disappears. In addition, the edge 25, moving with drummer 2 to the right (drawing), opens the flow of compressed air from the reverse camera 4 channel 23 in the camera forward stroke 3. The pressure in the chamber forward stroke 3 increases and the dip dispenser 24 is translated in the "open" position (to the left in the drawing). Begins to work for the main power system camera forward stroke 3: reverse camera 4 - channel 21 allocator 24 - channel 22 - Luggage forward stroke 3. Drummer 2 is braked, its movement is changed from reverse to direct the course. To this point, the exhaust valve 6 is securely pressed by the increased pressure to the surface of a small stage 14 and further along the striker forward is held pressed sequentially to the surface area of the coupling 15, and then to the surface of the large step 13. Before the blow of the striker 2 to the body 1 exhaust valve 6 is moved drummer for the edge of the exhaust channel 8. Luggage forward stroke 3 lasermedizin forward stroke 3 two-position valve 24 returns to its original position, the admission of compressed air into the chamber forward travel 3 stops. After hitting the constant pressure in the back-stroke chamber 4 provides movement of the striker 2 ago. The cycle repeats.

Pneumatic impact device (Fig.3) is a modification of the example shown in Fig.1. The difference in operation is connected to exhaust from the chamber reverse 4. When reverse motion of the striker 2 exhaust channel 8 is moved with the drummer in the direction of a small step 26 step of the socket. After the offset for the cut-off edge 27 (to the right in the drawing) starts to operate the exhaust tract: camera reverse 4 - grooves 17 - exhaust channel 8 - exhaust chamber 5 to the outlet 28 to the atmosphere. The pressure in the back-stroke chamber 4 drops sharply and the exhaust valve 6, to which the exhaust was pressed with pressure to the surface of the large step 13 elastically compressed. Further according to the work cycle of Fig.1. Since the exhaust channel 8 hosted outside of fragment 12, the exhaust valve 6 does not have to cross the edge of the exhaust channel 8. This increases the durability of the exhaust valve.

During operation of the device of the friction surface 18 (Fig.3) of the striker 2 and the housing 1 are produced. When the horizontal position of the machine, obrazu the valve 6, it is advisable to place it with the necessary radial preload on the floating intermediate ring 30. Due to the gap 31 between the intermediate ring 30 and drummer 2 exhaust valve 6 receives the opportunity to samoustraniajutsia coaxially with the surfaces 14, 15, 13, regardless of drawdown drummer 2 due to wear. When the flange 32 on the intermediate ring 30, having a diameter corresponding to the outside diameter of the exhaust valve 6, stabilizes the shape and size of the annular gap, which should overlap the exhaust valve 6. This configuration creates the most favorable conditions for the exhaust valve 6 and reduces the sensitivity of the device to the main wear parts - drummer 2 and the housing 1. Ultimately increases the durability of the machine.

These examples show that the implementation of a fragment of the inner surface of the housing, which is adapted to engage the exhaust valve, in the form of a stepped cylinder with a smooth pair of steps to significantly extend the exhaust valve and ultimately helps to ensure a good start, stable operation, increasing the impact energy and the efficiency of many types pneumatica.

Claims

1. Pneumatic impact device comprising a hollow body, a striker adapted to control the exhaust, the camera backward and forward movement, at least one of which is equipped with means dosed feed it with compressed air exhaust channel and an outlet valve in the form of an elastic sealing ring placed on the drummer with the ability to interact with a fragment of the inner surface of the casing bounding the chamber, characterized in that the selection made in the form of a stepped cylinder with a smooth pair of steps, and the diameter of the small stage matches the outside diameter of the exhaust valve, and a stepped cylinder is oriented small step in the direction of movement of the striker, reducing the volume of the chamber.

2. The device under item 1, characterized in that the exhaust channel located outside the specified section.

3. The device according to p. 2, wherein the exhaust channel is made in the drummer.

4. Device according to any one of paragraphs.1-3, characterized in that between the exhaust valve and the firing pin is mounted intermediate the ring flange, the diameter of which matches the outside diameter of the exhaust Klah is Arnica with radial clearance.

 

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