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A fluid-powered impact vibrator (5), in particular a hydraulic hammer, comprising a fluid-powered percussion hammer (8) with a percussion piston (18) that is moved back and forth under the effect of a control means (10) and comprising a guide unit (7) on which the percussion hammer is supported, whe

A fluid-powered impact vibrator (5), in particular a hydraulic hammer, comprising a fluid-powered percussion hammer (8) with a percussion piston (18) that is moved back and forth under the effect of a control means (10) and comprising a guide unit (7) on which the percussion hammer is supported, wherein the impact vibrator is additionally provided with a control valve, designed as a pressure monitor, for adaptation to the supplied input power. The control valve preferably is a pressure shut-off valve or a pressure-limiting valve (25) that is connected to the input pressure line (3) provided with the operating pressure, and automatically stops the percussion hammer (8) if the operating pressure resulting from the input power exceeds a specified maximum value. To stop the percussion hammer (8), either the pressure line (3) is blocked or the control means (10) is held in one of its end positions, i.e., the operating stroke or the return stroke positions. Moreover, the pressure shut-off valve or the pressure-limiting valve (25) preferably is a component of the guide unit, consisting of a support frame (7), or the percussion hammer (8) itself.

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1. A fluid-powered impact vibrator comprising:a fluid-powered percussion hammer having a percussion piston that can be moved back and forth within a cylinder housing by controlled fluid pressure, and a guide unit on which the percussion hammer is supported;control means, connected between a fluid pr

1. A fluid-powered impact vibrator comprising:a fluid-powered percussion hammer having a percussion piston that can be moved back and forth within a cylinder housing by controlled fluid pressure, and a guide unit on which the percussion hammer is supported;control means, connected between a fluid pressure inlet line and a pressure inlet to the cylinder housing, for controlling the back and forth movement of said percussion piston, with the control means including a valve moveable between operating stroke and return stroke positions for the percussion piston;and a control valve which is a component of one of the guide unit and the percussion hammer itself, and which is one of a pressure shut-off valve and a pressure-limiting valve, connected to the pressure inlet line for monitoring the fluid pressure in the pressure inlet line, and connected to the control means for causing the percussion hammer to be stopped automatically by at least one of blocking the pressure inlet line and holding the control means in one of its operating stroke and return stroke positions if the operating pressure in the fluid pressure inlet line exceeds a specified maximum value.2. A fluid-powered impact vibrator comprising:a fluid-powered percussion hammer having a percussion piston that can be moved back and forth within a cylinder housing by controlled fluid pressure, and a guide unit on which the percussion hammer is supported;control means, connected between a fluid pressure inlet line and a pressure inlet to the cylinder housing, for controlling the back and forth movement of said percussion piston, with the control means including a valve moveable between operating stroke and return stroke positions for the percussion piston; anda control valve which is a component of one of the guide unit and the percussion hammer itself, and which is one of a pressure shut-off valve and a pressure-limiting valve, connected to the pressure inlet line for monitoring the fluid pressure in the pressure inlet line, and connected to the control means for causing the percussion hammer to be stopped automatically by at least one of blocking the pressure inlet line and holding the control means in one of its operating stroke and return stroke positions if the operating pressure in the fluid pressure inlet line exceeds a specified maximum value wherein the control valve is disposed in an auxiliary pressure line connected to the pressure inlet line and the control means such that the control means is blocked in one of its operating stroke and return stroke positions once the maximum operating pressure value on the control valve is exceeded.3. A device according to claim 2, wherein the control valve is a pressure shut-off valve provided with a double piston disposed in a cylinder and having a reset device disposed in the cylinder and acting on the double piston in a direction of the opened position of the control valve, a valve chamber formed in the control valve cylinder and effective to cause the double piston to move in a direction toward the closed position of the control valve when the valve chamber is charged with pressure, and with the valve chamber being connected to the pressure inlet line via the pressure inlet and via a control line which opens into the valve chamber adjacent one end surface of the double piston.4. A device according to claim 2, wherein the control valve is a pressure-limiting valve whose inlet and whose control line are both connected to the pressure inlet line provided with the operating pressure.5. A device according to claim 4, wherein the control means is connected to the pressure-limiting valve and responsive to the condition thereof such that in the opened position of the pressure limiting valve, the control means is blocked in the operating stroke position after the maximum operating pressure value has been exceeded.6. A device according to claim 2, wherein: the control valve is a pressure-limiting valve having a control line connected to the pressure inlet line that is provided with the operating pressure, and having an outlet connected to a non-pressurized return-flow line; and, the control means is responsive to the pressure limiting valve assuming its open position, when the maximum operating pressure value is exceeded, to block in the return stroke position.7. A fluid-powered impact vibrator comprising: a fluid-powered percussion hammer having a percussion piston that can be moved back and forth within a cylinder housing by controlled fluid pressure, and a guide unit on which the percussion hammer is supported; control means, connected between a fluid pressure inlet line and a pressure inlet to the cylinder housing, for controlling the back and forth movement of said percussion piston, with the control means including a valve moveable between operating stroke and return stroke positions for the percussion piston; and a control valve which is a component of one of the guide unit and the percussion hammer itself, and which is one of a pressure shut-off valve and a pressure-limiting valve, connected to the pressure inlet line for monitoring the fluid pressure in the pressure inlet line, and connected to the control means for causing the percussion hammer to be stopped automatically by at least one of blocking the pressure inlet line and holding the control means in one of its operating stroke and return stroke positions if the operating pressure in the fluid pressure inlet line exceeds a specified maximum value,wherein the control valve is disposed in an auxiliary pressure line connected to the pressure inlet line and the control means such that the control means is blocked in one of its operating stroke and return stroke positions once the maximum operating pressure value on the control valve is exceeded; andwherein the control valve is a pressure shut-off valve which is connected in a reversing pressure line from the cylinder of the percussion hammer to the control means; said control valve has a control line connected to the pressure inlet line that is provided with the operating pressure; and said control valve is responsive to the maximum operating pressure value being exceeded to assume a blocked position, thereby causing the reversing line and the downstream control means to be blocked, thereby preventing further percussion piston movement.8. A device according to claim 1, wherein the control valve is a pressure shut-off valve provided with a double piston disposed in a cylinder and having a reset device disposed in the cylinder and acting on the double piston in a direction of the opened position of the control valve, a valve chamber formed in the control valve cylinder and effective to cause the double piston to move in a direction toward the closed position of the control valve when the valve chamber is charged with pressure, and with the valve chamber being connected to the pressure inlet line via the pressure inlet and via a control line which opens into the valve chamber adjacent one end surface of the double piston.