A hydraulic arrangement is provided for a spring support system. The hydraulic circuit arrangement includes a hydraulic cylinder, a hydraulic tank, a hydraulic conveying device, a hydraulic accumulator, a first selector valve arranged between the hydraulic accumulator and the hydraulic cylinder, a
A hydraulic arrangement is provided for a spring support system. The hydraulic circuit arrangement includes a hydraulic cylinder, a hydraulic tank, a hydraulic conveying device, a hydraulic accumulator, a first selector valve arranged between the hydraulic accumulator and the hydraulic cylinder, a control implement with at least three switch positions, that include a lifting position, a lowering position and a neutral position for the hydraulic cylinder and a pipe break safety arrangement arranged between the control implement and the hydraulic cylinder. In order to permit the opening of the pipe break safety arrangement, a first control pressure line extends between the pipe break safety arrangement and a conveying device and first switching devices are arranged in the first control pressure line so that a control pressure can be applied to the first control pressure line by switching the first switching devices and the pipe break safety arrangement can be controlled to open.
대표청구항▼
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. An improved hydraulic circuit arrangement for a spring support system having a hydraulic cylinder provided with at least one first chamber, a hydraulic tank, at least one conveying dev
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. An improved hydraulic circuit arrangement for a spring support system having a hydraulic cylinder provided with at least one first chamber, a hydraulic tank, at least one conveying device conveying a hydraulic fluid, a hydraulic accumulator, a hydraulic line arranged between the hydraulic accumulator and the first chamber, a first selector valve arranged in the first hydraulic line, a first supply line for the first chamber, a control implement with at least three switch positions that include a lifting position, a lowering position and a neutral position for the hydraulic cylinder and a pipe break safety arrangement arranged in the first supply line that includes a check valve closing in the direction of the control implement and a pressure relief valve that can be controlled over a first control pressure line, wherein the improvement comprises: the first control pressure line extending between the pipe break safety arrangement and a conveying device; and, the first switching devices are arranged in the first control pressure line, so that by switching the first switching devices a control pressure can be applied to the first control pressure line and the pressure relief valve can be controlled to open. 2. An improved hydraulic circuit arrangement according to claim 1, wherein coupling devices are provided that couple the first switching devices with the control implement in such a way that a switch position of the first switching devices, in which a pressure is applied to the first control pressure line, occurs synchronously to a lowering position of the control implement. 3. An improved hydraulic circuit arrangement according to claim 2, wherein the coupling devices include an actuation arrangement for the first switching devices that bring the first switching devices into a first or second switch position as a function of or proportional to the switch position of the control implement. 4. An improved hydraulic circuit arrangement according to claim 3, wherein the actuation arrangement includes an angle sensor or a position sensor. 5. An improved hydraulic circuit arrangement according to claim 3, wherein the control implement includes a valve slide and that the actuation arrangement includes a positioning slide connected to the valve slide and also includes an actuation plunger arranged on the first switching device, where the actuation plunger can be actuated from the positioning slide by moving the valve slide. 6. An improved hydraulic circuit arrangement according to claim 1, wherein the control implement can be controlled hydraulically and the coupling devices include a second control pressure line extending between the first control pressure line and the control implement so that pressure applied to the second control pressure line results in an application of pressure to the first control pressure line. 7. An improved hydraulic circuit arrangement according to claim 1, wherein the control implement includes a third control pressure line provided for the switching of the control implement into the lifting position, where two switching devices are arranged in the third control pressure line. 8. An improved hydraulic circuit arrangement according to claim 7, wherein the second switching devices include a proportional selector valve, in particular a pressure reduction valve through which a connection can be selectively established between the third control pressure line and the hydraulic tank or a conveying device. 9. An improved hydraulic circuit arrangement according to claim 7, wherein the second switching devices are configured as hydraulic joysticks, where a hydraulic supply of the third control pressure line can be established as soon as the second switching devices are moved into a position provided for the lifting position of the control implement. 10. An improved hydraulic circuit arrangement according to claim 1, wherein the first switching devices include a proportional selector valve in particular a pressure reduction valve through which a connection can selectively be established between the first control pressure line and the hydraulic tank or a conveying device. 11. An improved hydraulic circuit arrangement according to claim 1, wherein the switching devices can be actuated mechanically, electrically, hydraulically or pneumatically. 12. An improved hydraulic circuit arrangement according to claim 1, wherein the first switching devices are configured as hydraulic joysticks, where a hydraulic supply of the first and the second control pressure lines can be established as soon as the first switching devices are moved into a position provided for the lowering position of the control implement. 13. An improved hydraulic circuit arrangement according to claim 1, wherein the hydraulic cylinder is provided with a second chamber and a second supply line is provided for the second chamber and a second hydraulic line is arranged between the second chamber and the hydraulic tank. 14. An improved hydraulic circuit arrangement according to claim 13, wherein a second selector valve is provided and is arranged in the second hydraulic line. 15. An improved hydraulic circuit arrangement according to claim 14, wherein the second selector valve closes in the direction of the hydraulic tank when it is in the closing position. 16. An improved hydraulic circuit arrangement according to claim 14, wherein devices are provided that bring the second selector valve into a closed position when the control implement assumes a lowering position. 17. An improved hydraulic circuit arrangement according to claim 1, wherein the first and the second selector valve are provided with a closed position and an open position. 18. An improved hydraulic circuit arrangement according to claim 1, wherein the first selector valve closes in the closing position in the direction of the hydraulic accumulator.
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