Hydraulic percussion

 

(57) Abstract:

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 chamber, wzwodow chamber in which is located the head with a head and a stepped valve, forming its outer surface and the housing mechanism overflow cavity, occasionally associated with vsodaxes camera and constantly connected with the return line. Gas chamber partially filled with the working fluid, and the valve from the gas chamber has a cover, lateral profiled surface which forms with the inner surface of the gas chamber slit orifice. The liquid level in the gas chamber is equal to the valve stroke cocking mechanism. The invention provides for improving the reliability and durability of the mechanism. 1 C.p. f-crystals, 1 Il.

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.

Known hydraulic shock mechanism, cinema, brisk and tools. The mechanism includes a housing with vsodaxes chamber in which is located the head and a stepped valve, forming its outer surface and the housing mechanism overflow cavity, periodically chamber connected to the drain line through the distributor [1]. The dispenser is made in the form of a valve plunger gate and the control cavity, which is periodically reported to the drain line and vsodaxes camera.

The disadvantage of this mechanism is that the restrictor valve is the head of the striker, and a limit switch striker is the body mechanism. In the process, the contacting surface of the valve and firing pin, firing pin and the housing are subjected to shock loads, which leads to their destruction and loss of efficiency of the mechanism.

The closest solution to the technical essence and the achieved result is a 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 lead body in the upper part of the overflow cavity is made grooves, forming its 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 the formation 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 line, and usvajawa camera - with pressure line [2].

The disadvantage of this mechanism, as the previous one, is the low reliability and durability due to the fact that the restrictor valve is the body mechanism. Shock accompanying the operation of the mechanism, perceived contacting surfaces of the valve body, the valve and striker, which leads to their premature failure. The highest peak impact stress is on the cycle of operation of the mechanism, when the resistance of the destructible rocks are falling sharply. Almost all the energy of the moving parts is perceived by the body of the mechanism that leads to its vibration, the destruction of the contacting surfaces and loss of efficiency.

Energy Hai, because of the difficulty of sealing gas environment at high speed reciprocating motion.

When the reciprocating movement of the valve in the housing of the mechanism, the tightness of the gas in the gas chamber and sealing the working fluid in the pressure cavity is provided with sealing elements. Due to the fact that the sealing element from the side of the gas chamber operates in conditions of poor lubrication, there is increased wear. This leads to the need for frequent refueling gas energy storage and, ultimately, to the premature loss of efficiency of the mechanism.

The aim of the invention is to improve the operational reliability and durability of the mechanism.

The objective is achieved by the hydraulic mechanism impact gas chamber partially filled with the working fluid, and the valve from the gas chamber has a cover, lateral profiled surface which forms with the inner surface of the gas chamber slit orifice. The level of working fluid in a gas chamber is equal to the valve stroke cocking mechanism.

Partially filling the gas chambers LM working to improve the wear resistance of the sealing elements from the gas chamber due to the lubricating action of the working fluid which increases the operational reliability and durability of the mechanism while maintaining the specified energy performance.

Installing the cover on the valve side of the gas chamber with the formation of lateral profiled cover surface and the inner surface of the gas chamber slotted throttle reduces the shock load on the mating surface of the valve housing by means of hydraulic damping fluid in the end of the stroke, which prevents their destruction, and increases operational reliability and durability of the mechanism.

The effect of damping is determined by the height of the liquid level in the gas chamber. Installation of the liquid level in the gas chamber is equal to the valve stroke cocking mechanism eliminates the loss of kinetic energy of the valve in the process of destruction of rocks and only with the falling of resistance from the destructible rocks valve cover included in the working fluid and the dissipation of the kinetic energy of the valve through the hydraulic damping fluid in the end of the stroke of the valve.

The invention is illustrated in the drawing, which shows a section of the mechanism. Mehani is head 5 head 6 and a stepped valve 7, with the cover 8, which limits its working stroke (downward in the drawing). The side surface 9 of the cover 8 forms with the inner surface of the gas chamber 2 slotted orifice 10. The outer surface of the valve 7 and the inner surface of the housing 1 forms an overflow cavity 11, which is periodically connected with vsodaxes camera 4. On the inner surface of the housing 1 between the gas chamber 2 and the overflow cavity 11 formed by the discharge cavity 12, which has the ability to periodically communicate with the overflow cavity 11 through the implementation on the inner surface of the housing 1 of the grooves 13, which form between the surface of the valve 7 and the housing 1 a slit in the form of a labyrinth 14. Manual valve 7 is installed in the housing 1 with periodic overlap of the labyrinth 14 and the discharge cavity 12. The inner surface of the stepped valve 7 and the cylinder 6 of the striker 5 is formed subvalvular cavity 15, which is reported when the platoon firing pin 5 channels 16 in the valve 7 with the discharge cavity 12. Overflow cavity 11 is constantly communicated with the drain line 17 and usvajawa camera 4 with a pressure line 17.

The mechanism works as follows.

When you enable percussion mechanism in the work of the firing pin 5 is tightened, the m cone valve 7. Thus formed subvalvular cavity 15 is hermetically separated from vsodaxes camera 4. The working fluid flowing from the pressure line 18 in wzwodow chamber 4, overcoming the resistance of the gas stored in the gas chamber 2, starts to move the head 5 and the valve 7 in its upper position. Thus the fluid from the overflow cavity 11 is pressed into the discharge pipe 17. When the platoon firing pin 5 with the valve 7 and the overlapping maze 14 in the pressure cavity 12 and subvalvular cavity 15 is formed increased pressure exceeding the pressure in the overflow cavity 11, which separates the valve 7 and the die 5. The pressure in vsodaxes chamber 4 will fall and die 5 under the action of the energy of compressed gas in the gas chamber 2 will move down on the kick, and usvajawa the chamber 4 through the subvalvular cavity 15, the channels 16 and an overflow cavity 11 will be connected with a drain line 17. Under the action of gas pressure in the gas chamber 2, the valve 7 runs onto the head 6 of the striker 5 and mates with her. Then the cycle repeats.

At the end of the stroke the cover 8 of the valve 7 at high speed enters the working fluid 3 and displaces it through the gap 10 formed by the lateral profiled surface 9 of the cover 8 and the inner surface of the gas chamber 2. In PR the gifts on the mating surfaces of the valve and the casing is reduced, what prevents them from breakage and increases operational reliability and durability of the mechanism.

In the fall of resistance from the destructible rocks cover 8 limits the stroke of the valve 7. Thus the kinetic energy of the valve 7 is absorbed grosseserratus fluid, resulting in preventing the hard collision of the mating surfaces of the cover 8 and the body 1 and their destruction, which provides improved reliability and durability of the mechanism.

Thus, simple design changes and the introduction of the gas chamber of the working fluid reduces the leakage of gas from the gas chamber, to reduce friction and increase wear resistance of the sealing elements, to reduce the dynamic load on the mating surfaces of the valve and striker valve and body, resulting operational reliability and durability of the mechanism is greatly increased.

Sources of information taken into account

1. USSR author's certificate N 866161, CL E 21 C 3/20, 1981.

2. RF patent N 2071560, CL E 21 C 3/20, 1995.

1. Hydraulic percussion mechanism with sequential arrangement of the movable parts, comprising a housing with a gas ka is th surface and the housing mechanism overflow cavity, periodically associated with vsodaxes camera and constantly connected with the return line, wherein the gas chamber is partially filled with the working fluid, and the valve from the gas chamber has a cover, lateral profiled surface which forms with the inner surface of the gas slit camera throttle.

2. Hydraulic impact on p. 1, characterized in that the liquid level in the gas chamber is equal to the valve stroke cocking mechanism.

 

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EFFECT: increased efficiency.

3 dwg

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