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Description

one

The invention relates to hydraulic impact devices used as actuators for hand hammers, rotary hammers, boring machines, buttocks, etc. mechanisms.

Hydraulic percussion devices are known, including a housing, a compensation piston and a piston-die equipped with a spool-type distributor, a network accumulator connected to a pressure line, with an overflow and pressure cavity formed between each of the pistons and the housing, and there is a cavity between the ends of the pistons as a gas accumulator.

The disadvantage of such devices is the large magnitude of the recoil force during the acceleration of the piston-battery.

In order to reduce the recoil force, the overflow cavity of the piston-bushing is connected to the drain line through the overflow valve and the overflow cavity of the compensating piston, and the pressure cavities of the piston-bushing and compensation piston are interconnected as well as with the network accumulator of these cavities are equal.

In addition, the overflow valve may have a throttle hole.

FIG. 1 shows the described device, a longitudinal section; in fig. 2 - hydraulic circuit of the device.

The device consists of a split housing /, a piston-block 2, a compensation piston 3, an overflow valve 4 and a networked hydraulic accumulator 5. A spool valve 6 and 7 are placed in the central longitudinal bore of the piston box.

On the tail end of the piston block there are two systems of axial channels 8, 9 and channel 10. The Norshen head and the compensating piston form with the body overflow cavities 11 K 12, pressure cavities 13 and 14, and also

gas cavity 15, the latter being made in the form of a gas accumulator.

Channels 5 are permanently connected to the system of radial holes 16 and overflow cavity 11, and channels 9 to the system of radial holes.

channels 17 and the pressure cavity 13. The overflow cavity 12 is connected through an opening 18 to a drain line.

An annular gap 19 formed by the housing and the sleeve 20 is continuously connected with the cavity 21 of the supply network of the hydroaccumulator and the pressure cavities 13 and 14, and the channel 10 with the control cavity 22 of the valve and the opening 23.

When the flow of fluid under pressure in

annular gap 19 begins to move

the piston is right and the compensation piston is to the left; at the same time, the fluid enters the cavity 21 of the hydroaccumulators. The overflow valve during this period has a braking effect on the movement of the piston –block, since the liquid, which is pushed out briskly from the overflow cavity 11, overcomes the resistance of the overflow valve. As the speed increases during piston charging, the fluid from the cavity 21 of the hydroaccumulator is directed into the cavities 13 and 74, and at the moment of complete discharge of the hydroaccumulator of the piston 23, the hole 23 is connected to the pressure cavity 13. The liquid under pressure is fed into the control cavity 22 moves the spool to the right, compressing the spring 7.

Consequently, the systems of radial holes 16 and channels 17 are interconnected and the pressure in the cavities 11 and / 5 is equalized. From this moment, intensive braking begins and the subsequent acceleration of the pistons under the influence of gas pressure in the cavity 15, made in the form of a gas accumulator. During the acceleration period, the overflow valve has a braking effect on the compensation piston, since the fluid from the cavity 14 enters the cavity 12 through the gap 19, the cavity 13, the channels 9, 17, the hole 16, the channel 8, the cavity 11 and the overflow valve 4.

After the striking piston strikes the shank of the tool 24, the spool moves to the left position under the action of the spring and the inertial forces of motion and separates the pressure and overflow cavities. The compensation piston continues to move to the right, consuming its kinetic energy for charging the main hydraulic accumulator and charging the piston. During the period of acceleration of the pistons, the spool is held in the right position of the POWER of the Inertia, the rest of its mass.

In order to reduce the flow rate of the control and increase the speed, the control cavity 22 has a significantly smaller cross-sectional area than the spool, and the end cavities of the spool are constantly communicating with each other and with the overflow cavity // through drills made in the spool. To reduce the pressure peaks in the pressure line, the overflow valve is provided with a throttle orifice 25.

Subject invention

Claims (2)

1.Hydraulic impact device, including a housing, a compensation piston and a piston-block equipped with a spool-type distributor, a network accumulator connected to a pressure line, with an overflow and pressure cavity formed between each of the pistons and the housing, and a cavity formed between the ends of the pistons in the form of a gas accumulator, characterized in that, in order to reduce the recoil force, the overflow cavity of the piston -block is connected to the drain line through the overflow valve and the overflow cavity to the compensation piston, and the pressure cavities of the piston-strike and the compensation piston are interconnected, as well as with the network accumulator, and the cross-sectional areas of said cavities are equal. 2. The device according to claim 1, characterized in that the overflow valve is made with a throttle orifice.