Hydraulic percussion

 

The invention relates to impact tools that can be used in machines for the development of rock and frozen ground in the mining and construction industries. The mechanism includes a housing with a gas accumulator of energy, wzwodow chamber in which are positioned successively stepped valve and the hammer-head and double-sided stem, provided with two supports arranged in the housing on both sides of the head, which in the end of the stroke brisk forms with the housing a slot orifice, an overflow cavity, occasionally associated with vsodaxes camera and having the ability to transform into a pressure cavity with maintaining a constant connection with the subvalvular space. The valve mechanism is placed in the cavity installed in the outer casing with the formation of the overflow cavity, periodic communication with a drain line is made through a radial hole in the sleeve and drain the cavity formed by the groove on the outer surface of the sleeve and the inner surface of the housing. Mentioned radial hole in the sleeve, ensuring the transformation of the overflow cavity in the pressure cavity, made the throttle. The invention provides for the increases is retina refers to the impact mechanisms and machines, which can be used as a replacement of working equipment for excavators and loaders for loosening frozen soils, penetration asphalt concrete pavement, crushing of oversized and other similar work in the mining and construction industries.

Known hydraulic percussion mechanism, kinematic scheme which provides a consistent location in the case of mobile units, comprising a housing with a gas energy storage and wzwodow chamber in which is located the head with a head and a stepped valve, forming its outer surface and the housing overflow cavity, occasionally associated with vsodaxes camera. On the inner surface of the casing in the upper part of the overflow cavity is made of a groove forming surface and a stepped valve slit in the form of a labyrinth, with manual valve installed in the housing with the possibility of periodic overlap the specified labyrinth and education of the pressure cavity. The inner surface of the stepped valve and cylinder firing pin formed subvalvular cavity having the opportunity to communicate with the pressure cavity. Overflow cavity is constantly communicated with the drain m the action is when the selected design does not prevent misalignment of the striker, as cocking the hammer rests on the case only in its tail, resulting in not achieved hermetic separation vsodaxes camera from subvalvular cavity, which leads to unstable operation of the mechanism.

The disadvantages of this mechanism should also include the presence of shock interactions valve and striker with the body in the process that leads to their destruction and loss of efficiency.

The closest solution to the technical essence and the achieved result is adopted as a prototype hydraulic percussion mechanism, kinematic scheme which provides a consistent location in the case of mobile units, comprising a housing with a gas accumulator of energy, wzwodow chamber in which are positioned successively firing pin with a head and two-way rod, resting on two supports located in the housing on both sides of the head, which in the end of the stroke brisk forms with the housing a slot orifice, occasionally interacting with brisk speed valve, forming its outer surface and the casing pressure in the cavity by overlapping degree of the valve radial holes in the body with maintaining a constant connection with subvalvular cavity, which is formed by the inner surface speed of the valve and the end surface of the rod. Usvajawa Luggage is permanently connected with a pressure line [2].

This mechanism percussion finds practical use and has simple design, small length of the channels and high efficiency.

The disadvantage of this mechanism is that when a worker during his brisk working fluid coming from the hydraulic power source in wzwodow chamber, flows further into the drain line without doing useful work and brisk acceleration is only due to the energy in the battery cavity gas accumulated in the period of platoon firing pin. Eventually not implemented mechanism to achieve maximum impact energy with installed capacity of the hydraulic power source and the magnitude of the battery cavity.

The disadvantage of this mechanism is also low operational reliability and durability of pipelines, high pressure hoses and couplings due to the large amplitude oscillations of pressure in the drain line that leads to their destruction and loss of efficiency of the mechanism.

The task of the image is Astia.

The problem is solved in that in the hydraulic percussion mechanism, comprising a housing with a gas accumulator of energy, wzwodow chamber in which are positioned successively stepped valve and the hammer-head and double-sided stem, provided with two supports arranged in the housing on both sides of the head, which in the end of the stroke brisk forms with the housing a slot orifice, an overflow cavity, occasionally associated with vsodaxes camera and having the ability to transform into a pressure cavity with maintaining a constant connection with subvalvular cavity, according to the invention the valve mechanism is placed in the cavity installed in the outer casing with the formation of the overflow cavity, periodic communication with a drain line is made through a radial hole in the sleeve and drain the cavity formed by the groove on the outer surface of the sleeve and the inner surface of the housing, and the aforementioned radial hole in the sleeve, ensuring the transformation of the overflow cavity in the pressure cavity, made the throttle.

The invention is illustrated by the drawing, which shows a section of the mechanism.

The mechanism of shock on what zmoznostjo move along the axis of the mechanism posted by die 4 and a stepped valve 5. The hammer has a head 6, a top 7 and bottom 8 (drawing) rods and located in the housing in the lower 9 and upper 10 feet. The upper support 10 has channels 11 for passage of the working fluid. The upper edge of the rod 7 blunted by the minimum radius. The head 6 when the movement of the firing pin 4 on the kick is able to form with the housing 1 in the lower part vsodaxes camera 3 slotted orifice 12.

Manual valve 5 is placed in the cavity of the sleeve 13 mounted in the housing 1, a smaller internal bore 14 which is the backbone of the valve, and an internal bore of the sleeve 13 and the outer surface of the valve 5 form an overflow cavity 15, which is periodically connected with vsodaxes chamber 3 through radial holes 16 in the valve 5 and subvalvular cavity 17.

Overflow cavity 15 is periodically communicated with the drain line 18 via a throttled radial hole 19 made in the sleeve 13, and the drain cavity 20 formed by the groove on the outer surface of the sleeve 13 and the inner surface of the housing 1.

The valve 5 is placed in the cavity of the sleeve 13 with the possibility of periodic overlap throttle openings 19 step 21, resulting in the upper part of the overflow cavity is transformed into pressure cavity 22, which is 7 striker 4 forms a narrow annular contact surface 23, and from the side of the gas chamber 2 has a hollow cap 24, limiting the movement of the valve down (drawing). Usvajawa camera 3 is constantly communicated with the pressure line 25.

The mechanism works as follows.

In the initial state and the firing pin 4 is at the bottom (drawing) position and rests on the shaft of the working tool (on the drawing working tool not shown) or 6 cylinder firing pin 4 on a face surface vsodaxes camera 3. Valve 5 under the pressure of compressed gas in the cavity 2, is in the lowest position (drawing) and the cover 24 rests on the end surface of the bushing 13.

The working fluid from the pressure source (not shown) in the pressure line 25 enters wzwodow chamber 3, where the channels 11 in the top support 10, the radial holes 16 in the valve 5, an overflow cavity 15, a radial hole 19 in the drain cavity 20, and from there into the drain line 18. As overflow 15 and the drain 20 of the cavity communicated between a throttle opening 19 in the wall of the sleeve 13, between these cavities is formed by a differential pressure, which is determined by the diameter of the hole 19.

To activate the mechanism in the work head 4 tightened the working tool (not shown) do17 hermetically separated from vsodaxes camera 3 narrow annular contact surface 23, as the internal conical surface of the valve 5 communicates with the end of rod 7, the edge of which is blunt at the minimum radius.

The working fluid flowing from the pressure line 25 in wzwodow chamber 3 against the force of the gas energy storage 2, starts to move the head 4 and the valve 5 is in the upper position (on the drawing). When the gas pressure in the battery cavity 2 will be increased by reducing the volume of the gas at the entrance to the cavity 2 of the valve 5, and the working fluid from the overflow cavity 15 will begin to be forced out through the orifice 19 into the drain cavity 20, and from the latter to the case drain line 18. During idling (platoon firing pin) overflow occurs between 15 and drain 20 cavities differential pressure determined by the resistance after the working fluid through the orifice 19, insufficient for separation striker 4 and valve 5.

When the overlap of the step 21 of the throttle hole 19 of the upper part of the overflow cavity is transformed into pressure cavity 22 in which the pressure will increase. As a pressurized cavity 22 is connected by radial holes 16 with subvalvular cavity 17, the increased pressure will sever the head 4 and the valve 5.

After pueda annular gap short-haul and low resistance, as the rod 7 communicates with the inner cone of the valve 5 through the narrow annular contact surface through which the working fluid will flow from vsodaxes camera 3 in subvalvular cavity 17, the channel 16, an overflow cavity 15, the orifice 19 and the drain cavity 20 in the case drain line 18.

The pressure in vsodaxes chamber 3 will fall to the value defined by the throttling action of the radial holes 19, and the hammer 4 under the action of the energy accumulator 2 will begin to move down to stroke (working stroke).

This continued throughout the stroke high blood pressure in subvalvular cavity 17 defined by the throttling action of the radial holes 19, contributes to brisk acceleration to a higher speed, i.e., allows for brisk acceleration energy of the working fluid, which leads to an increase of the impact energy.

Additionally, the increased pressure of the working fluid in the subvalvular cavity 17 contributes to the conservation of a wide annular gap between the valve 5 and the edge of the rod 7 throughout the stroke that provides increased fluid flow to fill the increasing volume of the overflow cavity 15 between the stroke and prevents the valve 5, as imeche would have led to the loss of energy of the blow.

When applying the striker 4 attack tool (not shown), firing pin stops, and the valve 5 under the action of pressure in the gas energy accumulator 2 runs onto the stem 7 of the striker 4 and mated with him. Then the cycle repeats.

By reducing the resistance from the destructible rocks the hammer 4, short bearing 9, which is a limit switch striker passes the slit 12 in the form of a labyrinth formed by the cylinder 6 and the housing 1, resulting in the dissipation of the kinetic energy of the striker and he stops.

Valve 5 cannot communicate with the rod 7 of the striker 4, when the hammer is in the lowest position, so as to limit the stroke of the valve 5 is installed, the cover 24. To save the volume of the gas chamber 2, the cover 24 is made hollow. The mechanism is automatically disabled from work.

To re-enable mechanism in pulsed operation, you must pull the head 4 via a tool (not shown) to the interaction of the rod 7 with the inner valve cone 5. Then the cycle repeats.

Thus, from the above description of operation of the percussion mechanism can be seen that implementation of the proposed solution allows to use for acceleration is brisk in addition to energy compressed in akinaga interaction of the valve with the striker during the stroke and thereby to exclude the reduction of the impact energy, i.e., to improve performance and reliability of the mechanism.

The formation of the additional discharge cavity and the coordination of its volume with the volume of the overflow cavity with the additional installation of two or more drain lines allows to eliminate the influence of the drain line on the work of the mechanism and to reduce the amplitude of fluctuations in pressure of the working fluid in the drain line, which is beneficial to the reliability and durability of pipelines, high pressure hoses and couplings.

Installation for flow limiting valve core cap allows you to automatically stop the mechanism at the drop of resistance from the destructible rocks, while retaining the energy characteristics of the mechanism.

Sources of information taken into consideration

[1] Patent RF №2071560, CL E 21 3/20, 1995.

[2] Patent RF №2143072, CL E 2 37/00, 1999.

Claims

Hydraulic percussion mechanism, comprising a housing with a gas accumulator of energy, wzwodow chamber in which are positioned successively stepped valve and the hammer-head and double-sided stem, provided with two supports arranged in building the passive cavity, periodically associated with vsodaxes camera and having the ability to transform into a pressure cavity with maintaining a constant connection with subvalvular cavity, characterized in that the valve mechanism is placed in the cavity installed in the outer casing with the formation of the overflow cavity, periodic communication with a drain line is made through a radial hole in the sleeve and drain the cavity formed by the groove on the outer surface of the sleeve and the inner surface of the housing, and the aforementioned radial hole in the sleeve, ensuring the transformation of the overflow cavity in the pressure cavity, made the throttle.

 

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EFFECT: increased efficiency.

3 dwg

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