Hydraulic system for a lifting device

Abstract

A hydraulic system for a hydraulic lifting device (1), comprising - at least one controllable valve (2) for controlling a supply of hydraulic fluid to at least one hydraulic consumer (3) of the hydraulic lifting device (1), wherein the at least one controllable valve (2) has at least one first valve connection (4) that can be connected to a delivery device (12) for hydraulic fluid (51), and a second valve connection (5), and - at least one operating element (6) for controlling the at least one controllable valve (2), wherein a valve state of the at least one controllable valve (2) can be controlled by the operating element (6), wherein - the hydraulic system has at least one valve distribution block (7) with at least one fluid distributor (8), wherein the at least one fluid distributor (8) has a connection (9), wherein the connection (9) is or can be connected to the second valve connection (5) in a fluid-conducting manner,wherein - the valve distributor block (7) has at least two consumer connections (10, 11) for hydraulic fluid (51) that can be fluidly connected to the fluid distributor (8), wherein the at least two consumer connections (10, 11) can be fluidly switched, wherein at least one hydraulic consumer (3) of the hydraulic lifting device (1) can be fluidly connected to at least one of the at least two switchable consumer connections (10, 11).

Description

[0001] The invention relates to a hydraulic system for a lifting device having the features of the preamble of claim 1, a method for supplying at least one hydraulic consumer with hydraulic fluid using such a hydraulic system, a hydraulic lifting device having such a hydraulic system and a vehicle having such a lifting device.

[0002] Hydraulic systems for lifting devices known in the prior art have a large number of hydraulic actuators in the form of, for example, hydraulic cylinders or hydraulic motors for moving parts of a lifting device. The hydraulic actuators must be supplied with hydraulic fluid to perform their work functions. This requires not only a hydraulic fluid delivery device but also hydraulic lines and valves for directing and controlling the flow of the hydraulic fluid. The operating elements of such control valves are installed in lifting devices known in the prior art at positions on the lifting device that are accessible to a user. A hydraulic system of a lifting device usually comprises a large number of control valves or sections of a control valve and corresponding operating elements, essentially corresponding to the number of hydraulic actuators.

[0003] To supply and discharge hydraulic fluid to and from the hydraulic consumers, hydraulic lines must run between the user-operated control valve or the sections of a control valve and the hydraulic consumers. A corresponding number of hydraulic lines must be present, which has the disadvantage of requiring a correspondingly large amount of space, increasing production costs, increasing maintenance effort, and creating a high number of potential failure points in the hydraulic system. Particularly when the control valves or sections of a control valve required to control the working functions of a lifting device and the associated operating elements are arranged together in a position on the lifting device that is accessible to a user, this can result in a disadvantageously long line length of hydraulic lines to remote hydraulic consumers.In order to achieve high flow rates for such hydraulic lines, hydraulic lines with a large cross-section may be necessary.

[0004] The object of the invention is to provide a hydraulic system, a hydraulic lifting device, and a vehicle with such a hydraulic lifting device, as well as a method for supplying at least one hydraulic consumer with hydraulic fluid, in which the above-mentioned problems do not occur. In particular, a hydraulic system with a reduced number of hydraulic lines for supplying hydraulic consumers and / or with a reduced number of required operating elements and control valves for controlling hydraulic consumers is to be provided.

[0005] This object is achieved by a hydraulic system having the features of claim 1, a hydraulic lifting device having such a hydraulic system, and a vehicle having such a lifting device, as well as a method for supplying at least one hydraulic consumer with hydraulic fluid using such a hydraulic system. Advantageous embodiments of the invention are defined in the dependent claims.

[0006] The hydraulic system according to the invention can be suitable for a hydraulic lifting device. At least one controllable valve is provided to control the supply of hydraulic fluid to at least one hydraulic consumer of the hydraulic lifting device. The at least one controllable valve has at least one first valve connection, which can be connected to a hydraulic fluid delivery device, and a second valve connection.

[0007] A hydraulic actuator can, for example, be in the form of a hydraulic cylinder or a hydraulic motor.

[0008] Controlling the supply of hydraulic fluid to at least one hydraulic consumer may comprise controlling a flow rate, a quantity of hydraulic fluid, a hydraulic pressure of the hydraulic fluid and / or a flow direction of hydraulic fluid.

[0009] At least one control element is provided to control the at least one controllable valve, wherein the control element can be used to control a valve state of the at least one controllable valve. An control element can be actuated by a user.

[0010] A valve state may, for example, correspond to a substantially fluid-conducting or substantially fluid-blocking state of a valve. A valve state may, in particular, correspond to a specific flow rate, a specific amount of hydraulic fluid, a specific hydraulic pressure of the hydraulic fluid, and / or a specific flow direction of the hydraulic fluid.

[0011] A hydraulic system according to the invention comprises at least one valve distribution block with at least one fluid distributor, for example a first fluid distributor. For supplying and discharging hydraulic fluid to and from the at least one valve distribution block, the first fluid distributor has at least one connection, for example a first connection, wherein the connection is or can be connected in a fluid-conducting manner to the second valve connection of the at least one controllable valve. The at least one valve distribution block can be connected to the at least one controllable valve via at least one hydraulic line.

[0012] A fluid distributor can be formed at least partially in the valve distributor block. A fluid distributor can have connecting lines, which can also extend partially outside the valve distributor block. The connecting lines can be fluidically connected to one another at a common connection or at at least one valve connection of a controllable valve.

[0013] In principle, two or more valve manifold blocks can be or are connected to the second valve port of the at least one controllable valve.

[0014] The valve distribution block further comprises at least two consumer connections for hydraulic fluid, for example, a first and a second consumer connection, which can be fluidly connected to the fluid distributor. It is provided that the at least two consumer connections can be fluidly connected, in particular, individually or individually, wherein at least one hydraulic consumer, for example, a first hydraulic consumer, of the hydraulic lifting device can be fluidly connected to at least one of the at least two switchable consumer connections.

[0015] The at least two consumer connections that can be fluidly connected to the fluid distributor can be individually switchable, whereby one of the at least two consumer connections can be fluidly connected to the fluid distributor. In designs with multiple switchable consumer connections, one of the switchable consumer connections can be fluidly connected to the fluid distributor. In other words, in designs with multiple individually switchable consumer connections, hydraulic fluid can be distributed from the fluid distributor to one of the switchable consumer connections.

[0016] The at least two consumer connections that can be fluidly connected to the fluid distributor can be individually switchable, whereby one, both, or—in designs with multiple consumer connections—several of the at least two consumer connections can be fluidly connected to the fluid distributor. In designs with multiple switchable consumer connections, a single consumer connection, two or more consumer connections, or the consumer connections together can be fluidly connected to the fluid distributor.

[0017] In designs with several switchable consumer connections, a subset of the switchable consumer connections can generally be fluidly connected to the fluid distributor.

[0018] In general, at least one hydraulic consumer of the hydraulic lifting device can be connected in a fluid-conducting manner to each of the existing consumer connections.

[0019] A hydraulic consumer connected to a consumer connection and fluidly connected to the fluid distributor can be supplied with hydraulic fluid in a controlled manner by the controllable valve.

[0020] In one embodiment of the hydraulic system with a valve distribution block having at least one fluid distributor and at least one switchable first and switchable second consumer connection fluidly connectable thereto, a switchable supply of hydraulic fluid to hydraulic consumers connectable to the consumer connections can be achieved. The switchable consumer connections can be switchable individually, thereby enabling a selective or at least partially parallel supply of hydraulic fluid via the consumer connections, controlled by the controllable valve. This allows individual or multiple hydraulic consumers to be supplied with hydraulic fluid selectively or at least partially in parallel, controlled by a controllable valve.

[0021] In principle, at least one further valve distribution block according to the invention can be connected to at least one consumer connection of a fluid conductor of the valve distribution block, which can be switchable or permanently fluid-conducting.

[0022] The valve distribution block can be composed of at least two individual blocks, each with at least one fluid distributor and at least one switchable consumer connection that can be fluidically connected thereto, whereby a valve distribution block with at least two switchable consumer connections can be formed.

[0023] In an advantageous embodiment, the at least one controllable valve is designed as a valve with at least two switching positions. The control element can have at least a first and a second switching state, wherein the valve state of the at least one controllable valve can be controlled according to the switching state.

[0024] In particular, the operating element can have at least one operating lever that can be actuated by a user and deflected at least between a first and a second position, wherein the valve state of the at least one controllable valve can be controlled according to the deflection of the operating lever.

[0025] Preferably, the at least one controllable valve is designed as a proportional valve which can assume continuous states between a substantially fluid-blocking state and a substantially fluid-conducting state.

[0026] The at least two switchable consumer connections of the at least one distribution valve block can be switched, in particular individually or individually, between a substantially blocking and an at least partially fluid-conducting switching state, optionally also continuously, by means of at least one switching device. The switching device can be formed at least partially in the at least one distribution valve block. Parts of the switching device can be formed separately from the at least one distribution valve block.

[0027] The switchable consumer ports of the at least one distribution valve block can be used as a load-holding valve for a connected hydraulic consumer in a switching state that essentially blocks fluid. A load-holding valve can prevent an unwanted flow of fluid into and / or out of the connected hydraulic consumer.

[0028] In one embodiment of the switching device, it can have at least one switching valve with which the at least two switchable consumer connections can be switched. Such a switching valve can be designed in the form of a solenoid valve actuated by an electromagnet. The switching valve can also be designed in the form of a hydraulically pilot-controlled valve actuated by a specific amount of hydraulic oil supplied to a control input. In principle, a switching valve can be provided for each existing switchable consumer connection.

[0029] The switching device can have at least one switching element that can be actuated by a user and with which the switching state of at least one switchable consumer connection can be switched.

[0030] A switching device for a consumer connection switchable with a switching valve can comprise, as a switching element, at least one user-operable switch and / or a user-operable user interface for selecting the consumer connection to be switched, with which at least one switching valve can be actuated. In particular, the switching device can comprise a controller that controls the switching state of the switchable consumer connections according to a switching logic depending on the at least one switching element.

[0031] If the switching valve is designed in the form of a solenoid valve, an electromagnet of the solenoid valve can be actuated by the switching device.

[0032] If the switching valve is designed as a hydraulically pilot-operated valve, a certain quantity of hydraulic oil can be supplied to a control input of a hydraulically pilot-operated valve by the switching device.

[0033] In an advantageous embodiment, the at least one valve distribution block can have at least one further fluid distributor, for example a second fluid distributor, with at least one further connection, for example a second connection of the valve distribution block, wherein the at least one further connection of the further fluid distributor can be fluidly connected to a hydraulic fluid reservoir of the hydraulic system, for example a tank of the hydraulic system.

[0034] For example, to relieve or limit the pressure of a hydraulic consumer connected to a consumer connection, the at least one further fluid distributor can be fluidly connected to at least one of the at least two consumer connections by means of a valve, in particular a pressure relief valve. Advantageously, the at least one further fluid distributor can be fluidly connected to one of the consumer connections by means of a valve. In particular, a separate valve can be provided for each of the switchable consumer connections for fluidly connecting the consumer connection to the at least one further fluid conductor.

[0035] The hydraulic system may comprise at least one hydraulic consumer, wherein the at least one hydraulic consumer may be designed as a hydraulic cylinder, hydraulic motor, or hydraulic rotator.

[0036] The lifting device can have a controller that can be configured to control functions of the lifting device. The controller can generally have at least one computing unit and at least one memory unit containing the commands necessary for controlling functions of the lifting device. The computing unit can be in a data connection with the memory unit or can be connected to such a connection.

[0037] The control system can be remotely controlled by a remote control, wherein communication can be wireless and / or wired. The remote control system can have at least one user-operable control element for controlling a controllable valve and at least one user-operable switching element for controlling and configuring the distribution valve block.

[0038] To control the switching states of the switching valves of the valve distribution block, a valve control unit can be provided, which can be connected to the valve distribution block via a control line. The control of the switching valves via the control line can be hydraulically and / or electronically via suitable wired and / or wireless communication protocols.

[0039] A valve control system can generally comprise at least one computing unit and at least one memory unit, whereby the valve control system can be part of a control system of a lifting device or can be implemented by such a control system. The computing unit can be connected to the memory unit in a data connection or can be connected to such a connection. At least one user-operable switching element, with which the switching states of the switching valves and thus of the switchable consumer connections can be switched, can be part of the valve control system and / or be implemented separately from it.

[0040] The lifting device may have at least one valve control. A valve control and / or at least one switching element of a valve control may be arranged on the arm system and / or in the base of a lifting device.

[0041] A switching position of at least one switching element can be detected by the valve control and converted into corresponding switching states of the switching valves of the valve distribution block according to a switching logic stored in the memory unit and processed by the computing unit. These switching states of the switching valves, converted according to the switching logic, can serve to execute the desired selected work function of the hydraulic consumers connected to the valve distribution block.

[0042] To control the switching states of the switching valves, they can be connected to the valve control system via a control line. The controlled supply of hydraulic fluid to a selected hydraulic consumer or several selected hydraulic consumers can be achieved through the controllable valve, with an appropriate fluid connection, in accordance with the operation of the control element by a user.

[0043] In a method for supplying at least one hydraulic consumer with hydraulic fluid using a hydraulic system as described above, at least one hydraulic consumer to be supplied with hydraulic fluid can first be selected, for example in a selection method step. The selection can be made by a user using at least one switching element of a switching device. The switching device, which can be operated by a user using at least one switching element, can be part of the hydraulic system, wherein at least two switchable consumer connections of at least one distributor valve block can be switchable between a substantially blocking and an at least partially fluid-conducting switching state using the switching device.

[0044] Furthermore, for example, in an enabling process step, a switching state of at least one consumer connection of a valve distribution block selected with the at least one switching element can be switched to at least partially fluid-conducting mode according to the user's selection. According to the user's selection with the at least one switching element, the switching device can switch at least one switching valve of the at least two switchable consumer connections.

[0045] A supply of hydraulic fluid to the at least one selected hydraulic consumer can be controlled, for example in a control method step, by a user using at least one operating element of a controllable valve. In particular, the operating element can have at least one operating lever that can be actuated by a user and deflected at least between a first and a second position, wherein the valve state of the at least one controllable valve can be controlled according to the deflection of the operating lever. In particular, a supply of hydraulic fluid to a hydraulic consumer can take place at a specific flow rate, a specific quantity of hydraulic fluid, a specific hydraulic pressure of the hydraulic fluid, and / or a specific flow direction of hydraulic fluid, depending on a valve state.

[0046] Depending on the selection of the actuator to be supplied made by the user with the switching element and depending on the actuation of the operating element carried out or carried out by the user, hydraulic fluid can be conveyed from a conveying device to the at least one at least partially fluid-conducting switched consumer connection and at least one hydraulic consumer connected thereto, for example in a supply process step.

[0047] A user can assign the hydraulic consumers controllable by the control element using at least one switching element. Hydraulic fluid can be supplied to the at least one selected hydraulic consumer in accordance with the actuation of the control element.

[0048] If the procedure is repeated, a different assignment of the hydraulic consumers controlled by the control element can be made. A correspondingly different supply of hydraulic fluid to the selected hydraulic consumers can be made depending on the operation of the control element.

[0049] The selection with at least one switching element and the release of a consumer connection selected with the at least one switching element can occur essentially simultaneously. Likewise, the control of the valve state of the at least one controllable valve and the supply by delivery of hydraulic fluid can occur simultaneously.

[0050] After the actuator to be supplied has been selected, the control of the valve state and the supply by pumping hydraulic fluid can be repeated essentially as often as desired.

[0051] Protection is also sought for a hydraulic lifting device with a hydraulic system according to one of the preceding claims. Such a hydraulic lifting device can preferably be designed as a crane, in particular as a loading crane, knuckle-boom crane, or as a timber crane for loading timber.

[0052] The hydraulic lifting device may comprise at least a base and an arm system.

[0053] At least one hydraulic actuator can be arranged in or on the base. Such a hydraulic actuator can, for example, be designed in the form of at least one hydraulic cylinder of an extendable support, in the form of at least one hydraulic cylinder of a support leg, in the form of a hydraulic motor of a drive, and / or in the form of at least one hydraulic pivoting mechanism, for example for a pivoting arm system.

[0054] At least one hydraulic actuator can be arranged in or on the arm system. Such a hydraulic actuator can, for example, be designed in the form of at least one actuator in the form of a hydraulic cylinder and / or in the form of a hydraulic rotator.

[0055] The arm system can be mounted in the base. Preferably, the arm system can be mounted in the base so that it can rotate about a substantially vertical axis of rotation.

[0056] The at least one distribution valve block can be arranged in the base, and the at least one control element for controlling the at least one controllable valve can be arranged in or on the arm system. Preferably, the control element for controlling the at least one controllable valve can be arranged together with the at least one controllable valve in or on the arm system.

[0057] The at least one switchable consumer connection of the at least one distribution valve block can be switched between a blocking and an at least partially fluid-conducting switching state by at least one user-operable switching element, which can be part of at least one switching device. In particular, the switching state can follow a switching logic for selecting the hydraulic consumers to be supplied. The at least one switching element can be arranged in or on the arm system, wherein the at least one switching element can preferably be arranged together with the at least one operating element in or on the arm system.

[0058] Furthermore, protection is sought for a vehicle with a hydraulic lifting device as described above. Further details and advantages of the present invention are explained in more detail below with reference to the exemplary embodiments illustrated in the drawings. In the drawings: Figure 1 schematically shows an embodiment of a valve distribution block, Figure 2 schematically shows another embodiment of a valve distribution block, Figure 3 schematically shows another embodiment of a valve distribution block, Figure 4 schematically shows an embodiment of a valve distribution block with a fluid distributor partially formed in a valve distribution block, Figure 5a, 5b shows an embodiment of a hydraulic system with hydraulic consumers connected to a valve distribution block, Figure 5a, 5c shows another embodiment of a hydraulic system with hydraulic consumers connected to a valve distribution block, Figure 6 shows an embodiment of a lifting device with a hydraulic system, Figure 7 shows an embodiment of a hydraulic system based on Figure 6, Figure 8 shows an embodiment of a vehicle with a lifting device with a hydraulic system, Figure 9 schematically shows a sequence of a method for supplying at least one hydraulic consumer with hydraulic fluid, and Figures 10, 11 schematically show a further embodiment of a valve distribution block.

[0059] The Figures 1 to 4 show schematically different designs of valve manifold blocks 7. The Figure 5a and 5b show in combination a design of a hydraulic system together with hydraulic consumers 3. The Figure 5a and 5c show in combination another design of a hydraulic system together with hydraulic consumers 3. Figure 6 shows schematically an embodiment of a hydraulic lifting device 1 with a hydraulic system. Figure 7 shows an embodiment of a hydraulic system, such as is used for a lifting device 1 of the Figure 7 may be provided. Figure 8shows an embodiment of a vehicle 21 with a lifting device 1 with a hydraulic system. Figure 9 shows schematically a sequence of a method for supplying at least one hydraulic consumer 3 with hydraulic fluid. Figure 10 and 11 a further embodiment of a valve distribution block 7 with the function of return oil recycling for a connected hydraulic consumer 3 is shown.

[0060] Figure 1 shows schematically an embodiment of a valve distributor block 7 of a hydraulic system with a first fluid distributor 8, wherein the first fluid distributor 8 has a connection 9 with which the fluid distributor 8 can be connected or is connected in a fluid-conducting manner to a second valve connection 5 of a controllable valve 2 (see Figure 5a). In the embodiment shown, the valve distributor block 7 has two switchable consumer connections 10, 11 for hydraulic fluid 51 that can be connected to the fluid distributor 8 in a fluid-conducting manner.

[0061] The two switchable consumer connections 10, 11 each have a switching valve 13, with which the at least two switchable consumer connections 10, 11 can each be switched between a substantially blocking and an at least partially fluid-conducting switching state.

[0062] The valve distributor block 7 further comprises a second fluid distributor 15, which is connected to a further connection 16, for example to a hydraulic fluid reservoir 18 (see Figure 5a ) is fluidly connectable to hydraulic fluid 51 of the hydraulic system. The valve distributor block 7 also has a third fluid distributor 24 with a further connection 25.

[0063] The second fluid distributor 15 can be connected to the consumer connections 10, 11 in a fluid-conducting manner by means of valves 17, in the embodiment shown in the form of pressure relief valves.

[0064] At the two consumer connections 10, 11 of the valve distribution block 7 (as in Figure 5b or 5cshown), at least one hydraulic consumer 3 of the hydraulic lifting device 1 can be connected in a fluid-conducting manner. Hydraulic fluid 51 can be conveyed to a hydraulic consumer 3 via the consumer connections 10, 11, provided that these are in an at least partially fluid-conducting connection with the first fluid distributor 8 and the latter is pressurized with hydraulic fluid 51 by a conveying device 12. Hydraulic fluid 51 flowing back from this can flow back to the valve distribution block 7 via the consumer connections 22, 23, which in the embodiment shown are permanently fluid-conductingly connected to the second fluid distributor 15, and from there, if necessary, flow further to a hydraulic fluid reservoir 18 of the hydraulic system.

[0065] At least one further valve distribution block 7 can be connected to at least one consumer connection 41, 42, 43 of a fluid conductor 8, 15, 24. As in Figure 1As shown, the at least one consumer connection 41, 42, 43 can be designed to be permanently fluid-conducting, although a switchable design is also possible. The at least one consumer connection 41, 42, 43 can, of course, be fluid-blocking when not in use.

[0066] Figure 2 shows schematically another embodiment of a valve distribution block 7 of a hydraulic system. Analogous to the embodiment of the Figure 1 the valve distributor block 7 has a first fluid distributor 8 with a connection 9 and two consumer connections 10, 11 for hydraulic fluid 51, each of which can be fluidly connected to the fluid distributor 8 via its own switching valve 13.

[0067] The valve distribution block 7 also has a second fluid distributor 15, which can be fluidly connected to the consumer connections 10, 11 by means of valves 17 (again in the form of pressure relief valves). Not shown are any consumer connections permanently connected to the second fluid distributor 15 for the return flow of hydraulic fluid.

[0068] In the execution of the Figure 2 the valve distributor block 7 has a third fluid distributor 24, wherein the third fluid distributor 24 has a connection 25 with which the fluid distributor 24 can be connected or is connected in a fluid-conducting manner to a valve connection 32 of a controllable valve 2 (see Figure 5b ). In the embodiment shown, the valve distributor block 7 has two consumer connections 26, 27 for hydraulic fluid 51, which can be connected to the third fluid distributor 24 in a fluid-conducting manner and can be switched by means of their own switching valves 13.

[0069] On a like in Figure 2executed valve distribution block 7, at least one hydraulic consumer 3 with two connections, such as a double-acting hydraulic cylinder with a piston-side and a rod-side chamber for hydraulic fluid, can be connected to consumer connections 10, 26 of various fluid distributors 8, 24 (see for example Figure 5b ). Depending on the connection of the connections 9, 25 of the fluid distributors 8, 24 with a conveying device 12 and a hydraulic fluid reservoir 18 of the hydraulic system, for example, controlled by a correspondingly designed controllable valve 2 (see Figure 5a), hydraulic fluid 51 can be conveyed in different flow directions to a hydraulic consumer 3. At least one further consumer 3 with two connections can be connected to the consumer connections 11, 27, wherein the switching states of the switching valves 13 of the consumer connections 10, 11, 26, 27 can be used to select which of the hydraulic consumers 3 are to be supplied with hydraulic fluid 51.

[0070] Figure 3 shows schematically another embodiment of a valve distribution block 7 of a hydraulic system. Analogous to the embodiment of the Figure 1 the valve distributor block 7 has a first fluid distributor 8 with a connection 9 and two consumer connections 10, 11 for hydraulic fluid 51, which can be connected to the fluid distributor 8 via a switching valve 13 each.

[0071] The Figure 3The valve distributor block 7 shown further comprises a second fluid distributor 15, which is connected to a further connection 16, for example to a hydraulic fluid reservoir 18 (see Figure 5a ) of the hydraulic system can be connected in a fluid-conducting manner.

[0072] Furthermore, the valve distributor block 7 has a third fluid distributor 24, wherein the third fluid distributor 24 has a connection 25 with which the fluid distributor 24 can be connected or is connected in a fluid-conducting manner to a valve connection 32 of a controllable valve 2 (see Figure 5a ). In the embodiment shown, the valve distributor block 7 has two consumer connections 28, 29 for hydraulic fluid 51, which can be connected to the third fluid distributor 24 in a fluid-conducting manner and can be switched by switching valves 13.

[0073] The third fluid distributor 24 is fluidly connected to the second fluid distributor 15 via a switchable relief valve 28. If the second fluid distributor 15 is fluidly connected to a hydraulic fluid reservoir 18 of the hydraulic system, hydraulic fluid 51 flowing back via the consumer ports 26, 27 can flow to a hydraulic fluid reservoir 18—independently of or in addition to a connection of port 25 to a hydraulic fluid reservoir 18.

[0074] Figure 4schematically shows an embodiment of a valve distribution block 7 with a fluid distributor 8 partially formed in the valve distribution block 7. The fluid distributor 8 has connecting lines 8a, 8b running partially outside the valve distribution block 7, which are connected to one another at a common connection 9. Contrary to what is shown, the connecting lines 8a, 8b can be connected in a fluid-conducting manner to at least one valve connection of a controllable valve. The valve distribution block of the embodiment of Figure 4 has two consumer connections 10, 11 for hydraulic fluid 51, which can be fluidly connected to the fluid distributor 8 and each switchable with a switching valve 13. The valve distributor block 7 also has a second fluid distributor 15, which can be fluidly connected to the consumer connections 10, 11 with valves 17 (again in the form of pressure relief valves).

[0075] In the Figure 5a and 5b5a and 5c respectively show embodiments of a hydraulic system with hydraulic consumers 3 connected to a valve distribution block 7. In Figure 5b These are designed in the form of a hydraulic motor and a hydraulic cylinder. In Figure 5c These are designed as a hydraulic slewing mechanism and as a hydraulic cylinder of a support of a lifting device 1 (see Figure 6 ) is executed.

[0076] The supply of the hydraulic consumers 3 with hydraulic fluid 51 can generally be carried out either individually or at least partially in parallel with a controllable valve 2.

[0077] In the hydraulic system according to the design of the Figure 5a , 5b or 5a, 5c, hydraulic fluid 51 can be conveyed from a hydraulic fluid reservoir 18 by a conveying device 12 via a conveying line 29 to a first valve connection 4 of a controllable valve 2. From the controllable valve 2, Figure 5aOnly the valve section 33 relevant for controlling the flow of hydraulic fluid 51 to the valve distribution block 7 is shown. Additional valve sections may be provided for further, separately controllable functions of the hydraulic system. Hydraulic fluid 51 flowing back from the controllable valve 2 can flow from a third valve port 31 via a tank line 30 into the hydraulic fluid reservoir 18. The valve distribution block 7 is connected to the second valve port 4 and the fourth valve port 32 on the controllable valve 2 via hydraulic lines 34, 35.

[0078] The hydraulic system has a user-operable control element 6, which is connected to the controllable valve 2 via control lines 37 and is used to control a valve state of the at least one controllable valve 2. The control element 6 can be used to control the distribution of hydraulic fluid 51 delivered to the first valve port 4 to one of the valve ports 5, 32. Likewise, the distribution of hydraulic fluid 51 flowing back to one of the valve ports 5, 32 to the third valve port 31 can be controlled. A valve state that can be controlled in this way can control a flow rate, a quantity of hydraulic fluid, a hydraulic pressure of the hydraulic fluid 51, and a flow direction of hydraulic fluid 51 in the hydraulic lines 34, 35.

[0079] The valve distribution block 7 has in the Figure 5bThe embodiment shown has three fluid distributors 8, 15, 24. A first fluid distributor 8 is fluidly connected to the second valve connection 5 of the controllable valve 2 via the hydraulic line 34 at its connection 9. A second fluid distributor 15 is fluidly connected to the hydraulic fluid reservoir 18 at its connection 16 via the tank line 36. A third fluid distributor 24 is fluidly connected to the fourth valve connection 32 of the controllable valve 2 at its connection 25 via the hydraulic line 35.

[0080] The valve distribution block 7 has two consumer connections 10, 11, which can be fluidly connected to the first fluid distributor 8 via switching valves 13, for two hydraulic consumers 3, here designed as a hydraulic motor and a double-acting hydraulic cylinder, which can be individually supplied with hydraulic fluid 51. In addition, the valve distribution block 7 has a consumer connection 38, which can be fluidly connected to the third fluid distributor 24 via a switching valve 13.

[0081] The switchable consumer connection 10 can be switched between a substantially blocking and an at least partially fluid-conducting switching state by means of a switching element 14 of a switching device connected to the corresponding switching valve 13. A hydraulic consumer 3 in the form of a hydraulic motor connected to the switchable consumer connection 10 can be supplied with hydraulic fluid 51 in a controlled manner by the controllable valve 2 with a corresponding fluid-conducting connection. Hydraulic fluid 51 flowing from the hydraulic consumer 3 can flow via the consumer connection 22, which is permanently fluid-conductingly connected to the second fluid distributor 15, via the tank line 36 to the hydraulic fluid reservoir 18 of the hydraulic system.

[0082] The switchable consumer connections 11 and 38 can be switched between a substantially blocking and an at least partially fluid-conducting switching state by means of a further switching element 14 of a switching device connected to the corresponding switching valves 13. The hydraulic consumer 3, in the form of a double-acting hydraulic cylinder, connected to the consumer connections 11 and 38 can be supplied with hydraulic fluid 51 in a controlled manner by the controllable valve 2 with a corresponding fluid-conducting connection. The previously described controllable valve state of the controllable valve 2 makes it possible to control a flow rate, a quantity of hydraulic fluid, a hydraulic pressure of the hydraulic fluid 51, and a flow direction of hydraulic fluid 51 in the fluid distributors 8, 24, and thus a movement of the hydraulic consumer 3, in the form of the double-acting hydraulic cylinder.

[0083] The second fluid distributor 15 can be connected to the switchable consumer connections 10, 11, 38 in a fluid-conducting manner by means of valves 17, in the embodiment shown in the form of pressure relief valves.

[0084] Analogously, the valve distribution block 7 in the Figure 5c shown version three fluid distributors 8, 15, 24 with corresponding connections 6, 16, 25 for the hydraulic lines 34, 36, 35 of the Figure 5a on.

[0085] The valve distributor block 7 has two consumer connections 10, 26, which can be connected to the first fluid distributor 8 and the third fluid distributor 24 via switching valves 13, for two hydraulic consumers 3 of a hydraulic slewing mechanism that can be simultaneously supplied with hydraulic fluid 51. For the sake of clarity, the corresponding switching elements are shown in Figure 5c not shown.

[0086] The valve distribution block 7 further comprises switchable consumer connections 11, 27, 38, 39 for hydraulic consumers 3 in the form of double-acting hydraulic cylinders of a support of a lifting device 1 (see again Figure 6 ). The consumer connections 11, 38, 39 are fluidly connected to the first fluid distributor 8 via switching valves 13, whereby the hydraulic consumers 3 can be supplied individually or at least partially in parallel with hydraulic fluid 51. The valve distributor block further has a consumer connection 27 which can be fluidly connected to the third fluid distributor 24 via a switching valve 13, via which the connected hydraulic consumers 3 can be simultaneously supplied with hydraulic fluid 51. For the sake of clarity, corresponding switching elements are shown in Figure 5c not shown.

[0087] The different designs of a hydraulic system according to the Figure 5a and 5bor 5a and 5c clearly show that a hydraulic system with a valve distribution block 7 as described enables a reduced number of hydraulic lines 34, 36, 35 to supply a plurality of hydraulic consumers 3 and a reduced number of required control elements 6 and controllable valves 2 to control the hydraulic consumers 3.

[0088] By arranging the controllable valve 2 between the conveyor device 12 and the valve distribution block 7 of the Figure 5a , 5b and 5a , 5c In the embodiments of the hydraulic system shown, the controllable valve 2 essentially controls the flow of hydraulic fluid 51 to the hydraulic consumers 3. Unlike in the Figure 5a , 5b and 5a , 5cAs shown, the return flow can generally also be controlled by a controllable valve. In such an arrangement, a delivery device can be connected to the hydraulic consumers, and a valve distribution block distributing the returning hydraulic oil can be arranged between the hydraulic consumers and a controllable valve.

[0089] In the Figure 5a , 5b , 5c , 6 and 7 a dividing line T is drawn, which illustrates how the hydraulic system of a lifting device 1 can be divided. At least one distribution valve block 7 can be arranged in the base 7. With reference to the Figure 6 this may correspond to an arrangement below the dividing line T. At least one operating element 6 for controlling the at least one controllable valve 2 may be arranged, preferably together with the at least one controllable valve 2, in or on the arm system 20. With reference to the Figure 6this may correspond to an arrangement above the dividing line T. At least one user-operable switching element 14 of at least one switching device may be arranged, preferably together with the at least one operating element 6, in or on the arm system 20. With reference to the Figure 6 this may correspond to an arrangement above the dividing line T.

[0090] Figure 6 shows a schematic representation of an embodiment of a hydraulic lifting device 1 in the form of a crane with a hydraulic system as described above.

[0091] The hydraulic lifting device 1 has a base 19 and an arm system 20, wherein the arm system is mounted in the base 19 so as to be rotatable about a substantially vertical axis of rotation z.

[0092] The hydraulic lifting device 1 can be a Figure 5a , 5c or Figure 7shown hydraulic system with hydraulic pickups 3 in the form of at least one hydraulic swivel mechanism for swiveling the arm system 20 and in the form of hydraulic cylinders of a support.

[0093] A corresponding distribution valve block 7 of the hydraulic system can be arranged in the base 7. Two control stations with at least one control element 6 for controlling a controllable valve 2 and at least one switching element 14 for controlling and configuring the distribution valve block 7 are arranged on the arm system 20.

[0094] In Figure 6Further schematically shown is a control system 21 of the lifting device 1, which can be configured to control functions of the lifting device. The control system 21 can be remotely controlled by a remote control 53, wherein communication can be wireless and / or wired. The remote control 53 can have at least one operating element 6 for controlling a controllable valve 2 and at least one switching element 14 for controlling and configuring the distribution valve block 7.

[0095] Figure 7 shows an embodiment of a hydraulic system as it is used by a lifting device 1 of the Figure 6 can have, wherein only one control station with a control element 6 and a switching element 14 for controlling and configuring the controllable valve 2 is shown.

[0096] A distribution valve block 7 with multiple switching valves 13 for selectively supplying hydraulic consumers 3 with hydraulic fluid 51 can be arranged in the base 7 of a lifting device 1. An operating element 6 of a controllable valve 2 and a switching element 14 for controlling and configuring the distribution valve block 7 can be arranged on the arm system 20 of a lifting device 1. A valve state of the controllable valve 2, and thus the flow of hydraulic fluid 51 through the controllable valve 2, can be controlled by a user using the operating element 6.

[0097] In the hydraulic system, hydraulic fluid 51 can be pumped from a hydraulic fluid reservoir 18 by a pump 18 via a delivery line 29 to a first valve port 4 of a controllable valve 2. A port 9 of a first fluid distributor 8 of the valve distributor block 7 can be connected to a second valve port 5 of the controllable valve 2 via a hydraulic line 34. For hydraulic fluid 51 flowing back to the hydraulic fluid reservoir 18, a tank line 30 can be connected to a third valve port 31 of the controllable valve 2. A port 16 of a second fluid distributor 15 of the valve distributor block 7 can be connected to a valve port 52 of the controllable valve 2 via a tank line 36, wherein the valve port 52 can be connected or can be connected to the third valve port 31 and thus to the tank line 30 via the controllable valve 2.A port 25 of a third fluid distributor 24 of the valve distribution block 7 is connected to a fourth valve port 32 of the controllable valve 2. Depending on the valve state of the controllable valve 2, the hydraulic line 34 or the hydraulic line 35 can be pressurized with hydraulic fluid 52.

[0098] Pressure relief valves, such as those used in the Figures 1 to 5 and the Figure 5a , 5b are not shown here for presentation reasons.

[0099] The valve distributor block 7 has consumer connections 10, 26, 11, 27 which can be connected to the first fluid distributor 8 and the third fluid distributor 24 via switching valves 13 for two hydraulic consumers 3 which can be individually supplied with hydraulic fluid 51 and are designed here as double-acting hydraulic cylinders of a support of the lifting device 1.

[0100] The valve distributor block 7 further comprises two consumer connections 38, 39, which can be connected in a fluid-conducting manner to the first fluid distributor 8 and the third fluid distributor 24 via switching valves 13, for two hydraulic consumers 3 of a hydraulic swivel mechanism which can be supplied simultaneously with hydraulic fluid 51.

[0101] In addition, the valve distributor block 7 has two consumer connections 49, 50, which can be fluidly connected to the first fluid distributor 8 and the second fluid distributor 15 via switching valves 13, for a hydraulic consumer in the form of a hydraulic motor, for example for driving the lifting device 1, which can be supplied with hydraulic fluid.

[0102] In this version of the valve distribution block 7, the consumer connections 41, 42, 43 are also designed to be switchable via switching valves 13.

[0103] A valve control 46 may be provided to control the switching states of the switching valves 13 of the valve distribution block 7. The valve control 46 may be connected to the valve distribution block 7 via a control line 45. The control of the switching valves 13 via the control line 45 may be hydraulically or electronically via suitable wired and / or wireless communication protocols.

[0104] The valve control 46 can fundamentally comprise at least one computing unit 47 and at least one memory unit 48. The computing unit 47 can be in a data connection with the memory unit 48 or can be brought into such a connection. In the embodiment shown, the user-operable switching element 14, with which the switching states of the switching valves 13 and thus of the switchable consumer connections 10, 26, 11, 27, 38, 39, 41, 42, 43, 49, 50 can be switched, is part of the valve control 46. A switching position of the switching element 14 can be detected by the valve control 46 and converted into corresponding switching states of the switching valves 13 of the valve distribution block 7 according to a switching logic stored in the memory unit 48 and processable by the computing unit 47. To control the switching states of the switching valves 13, these can be connected to the valve control 46 via a control line 45.The controlled supply of a selected hydraulic consumer 3 or several selected hydraulic consumers 3 with hydraulic fluid can be carried out by the controllable valve 2 in accordance with the actuation of the control element 6 by a user, provided there is a corresponding fluid-conducting connection.

[0105] Despite the large number of hydraulic consumers 3 that can be supplied with hydraulic fluid 51 via the valve distribution block 7, only a minimal number of hydraulic lines 29, 30, 34, 35, 36 and control lines 45 are required between a base 7 and an arm system 20 of a lifting device 1.

[0106] Figure 8 shows an embodiment of a vehicle 21 with a lifting device 1 with a hydraulic system, which has a valve distribution block 7 and a valve control 46. The design of the hydraulic system can be analogous to that of the Figure 5a and 5c , the Figure 6 or the Figure 7 be trained. In Figure 8Further schematically shown is a control system 21 of the lifting device 1, wherein the control system 21 can be remotely controlled by a remote control 53. The remote control 53 can have at least one operating element 6 for controlling a controllable valve 2 and at least one switching element 14 for controlling and configuring the distribution valve block 7.

[0107] In a case like Figure 9 In the illustrated sequence of a method for supplying at least one hydraulic consumer 3 with hydraulic fluid 51 using a hydraulic system as described above, a selection (i) of at least one hydraulic consumer 3 to be supplied with hydraulic fluid 51 can first be made.

[0108] When disconnected ii, a switching state of at least one consumer connection 10, 11 of a valve distribution block 7 selected with the at least one switching element 14 can be switched to at least partially fluid-conducting state according to the user's selection.

[0109] In a controller iii, the at least one selected hydraulic consumer 3 can be supplied with hydraulic fluid 51 by a user with at least one control element 6 of a controllable valve 2.

[0110] A supply iv of the at least one selected hydraulic consumer 3 can be carried out according to the selection of the actuator 10, 11 to be supplied made by the user with the switching element 14 and according to the actuation of the operating element 6 carried out or carried out by the user by conveying hydraulic fluid 51 from a conveying device 12 to the at least one at least partially fluid-conducting switched consumer connection 10, 11 and at least one hydraulic consumer 3 connected thereto.

[0111] The Figure 10 and 11shows schematically a further embodiment of a valve distribution block 7 of a hydraulic system, which largely like the valve distribution block 7 of the Figure 2 The valve distributor block 7 has a first fluid distributor 8 with a connection 9 and two consumer connections 10, 11 for hydraulic fluid 51, each of which is fluidly connected to the fluid distributor 8 via its own switching valve 13. The valve distributor block 7 also has a second fluid distributor 15, which is fluidly connected to the consumer connections 10, 11 by valves 17 (again in the form of pressure relief valves). The valve distributor block 7 has a third fluid distributor 24, wherein the third fluid distributor 24 has a connection 25, with which the fluid distributor 24 is fluidly connected to a valve connection 32 of a controllable valve 2 (see again Figure 5b). In the embodiment shown, the valve distribution block 7 has two consumer connections 26, 27 for hydraulic fluid 51, which can be fluidly connected to the third fluid distributor 24 and switched by means of their own switching valves 13. In addition, the valve distribution block 7 has a check valve 54 between the connection 25 and the third fluid distributor 24. The third fluid distributor 24 is connected to the first fluid distributor 8 by means of a lockable check valve 55, wherein the lockable check valve 55 can be opened in the direction of the first fluid distributor 8. A blocking pressure is tapped between the connection 25 and the check valve 54.

[0112] On valve manifold block 7 of the Figure 10 and 11 hydraulic consumer 3 is connected with two connections in the form of a double-acting hydraulic cylinder with a piston-side and a rod-side chamber.

[0113] In the Figure 10 and 11the switching valves 13 of the switchable consumer connections 10, 26 are in a fluid-conducting switching position.

[0114] Will be as in Figure 10 Illustrated: To retract the hydraulic cylinder, port 25 and thus the third fluid distributor 24 are pressurized with hydraulic fluid 51, check valve 54 is opened and the lockable check valve 55 is blocked. Hydraulic fluid 51 flows via the open-switched consumer port 26 into the rod-side chamber of the hydraulic consumer 3. Hydraulic fluid 51 displaced from the piston-side chamber of the hydraulic consumer 3 can flow out of port 9, for example, into a hydraulic fluid reservoir 18, via the open-switched consumer port 10.

[0115] Will be as in Figure 11illustrated in the figure: When the connection 9 and thus the first fluid distributor 8 are pressurized with hydraulic fluid 51 to extend the hydraulic cylinder, hydraulic fluid 51 can flow via the open consumer connection 10 into the piston-side chamber of the hydraulic consumer 3. Hydraulic fluid 51 displaced from the rod-side chamber of the hydraulic consumer 3 closes the check valve 54 and opens the lockable check valve 55, since the connection 25 is pressure-free. Due to the smaller surface area of ​​the piston in the rod-side chamber of the hydraulic consumer 3, the displaced hydraulic fluid 51 can have a higher pressure than the hydraulic fluid 51 flowing towards the piston-side chamber, whereby the displaced hydraulic fluid 51 can flow via the open consumer connection 10 towards the piston-side chamber of the hydraulic consumer 3 for return oil utilization. List of reference symbols

[0116] 1 hydraulic lifting device 2 controllable valve 3 hydraulic consumer 4 first valve connection 5 second valve connection 6 control element 7 valve distributor block 8 fluid distributor 8a fluid distributor connection lines 8b fluid distributor connection lines 9 connection 10 switchable consumer connection 11 switchable consumer connection 12 conveyor device 13 switching valve 14 switching element 15 fluid distributor 16 connection 17 valve 18 hydraulic fluid accumulator 19 base 20 arm system 21 vehicle 22 consumer connection 23 consumer connection 24 fluid distributor 25 connection 26 consumer connection 27 consumer connection 28 relief valve 29 conveyor line 30 tank line 31 third valve connection 32 fourth valve connection 33 valve section 34 hydraulic line 35Hydraulic line 36Tank line 37Control line 38Switchable consumer connection 39Switchable consumer connection 40Crane control 41Consumer connection 42Consumer connection 43Consumer connection 45Control line 46Valve control 47CPU 48Storage unit 49SwitchableConsumer connection 50Switchable consumer connection 51Hydraulic fluid 52Fifth valve connection 53Remote control 54Check valve 55Lockable check valve iSelection in process iiRelease in process iiiControl in process ivSupply in process zRotary axis

Claims

1. A hydraulic system for a hydraulic lifting device (1), comprising - at least one controllable valve (2) for controlling a supply of hydraulic fluid to at least one hydraulic consumer (3) of the hydraulic lifting device (1), wherein the at least one controllable valve (2) has at least one first valve connection (4) that can be connected to a delivery device (12) for hydraulic fluid (51), and a second valve connection (5), and - at least one operating element (6) for controlling the at least one controllable valve (2), wherein a valve state of the at least one controllable valve (2) can be controlled by the operating element (6), characterized in that- the hydraulic system has at least one valve distributor block (7) with at least one fluid distributor (8), wherein the at least one fluid distributor (8) has a connection (9), wherein the connection (9) is or can be connected to the second valve connection (5) in a fluid-conducting manner, wherein - the valve distributor block (7) has at least two consumer connections (10, 11) for hydraulic fluid (51) that can be connected to the fluid distributor (8) in a fluid-conducting manner, wherein the at least two consumer connections (10, 11) can be switched in a fluid-conducting manner, wherein at least one hydraulic consumer (3) of the hydraulic lifting device (1) can be connected in a fluid-conducting manner to at least one of the at least two switchable consumer connections (10, 11).

2. Hydraulic system according to the preceding claim, wherein the at least two switchable consumer connections (10, 11) can be switched individually or individually in a fluid-conducting manner.

3. Hydraulic system according to one of the preceding claims, wherein the at least one controllable valve (2) is a valve with at least two switching positions, preferably a proportional valve, and the operating element (6) has at least a first and a second switching state, wherein the valve state of the at least one controllable valve (2) is controllable according to the switching state of the operating element (6).

4. Hydraulic system according to one of the preceding claims, wherein the at least one fluid distributor (8) is at least partially formed in the valve distributor block (7).

5. Hydraulic system according to one of the preceding claims, wherein at least one further valve distribution block (7) can be connected to at least one consumer connection (41) of at least one fluid conductor (8).

6. Hydraulic system according to one of the preceding claims, wherein the at least two switchable consumer connections (10, 11) of the at least one distributor valve block (7) can be switched between a substantially blocking and an at least partially fluid-conducting switching state by means of at least one switching device.

7. Hydraulic system according to the preceding claim, wherein the switching device has at least one switching valve (13) with which the at least two switchable consumer connections (10, 11) can be switched.

8. Hydraulic system according to one of the two preceding claims, wherein the switching device has at least one switching element (14) which can be actuated by a user and with which the switching states of the at least two switchable consumer connections (10, 11) can be switched.

9. Hydraulic system according to one of the preceding claims, wherein the distributor valve block (7) has at least one further fluid distributor (15), for example a second fluid distributor (15), with a further connection (16), wherein the connection (16) of the fluid distributor (15) is fluidly connectable to a hydraulic fluid reservoir (18) of the hydraulic system, wherein the at least one further fluid distributor (15) with a valve (17), in particular a pressure relief valve, is fluidly connectable to at least one of the at least two consumer connections (10, 11).

10. Hydraulic system according to one of the preceding claims, wherein the hydraulic system has at least one hydraulic consumer (3), wherein preferably the at least one hydraulic consumer (3) is designed as a hydraulic cylinder, as a hydraulic motor or as a hydraulic rotator.

11. A method for supplying at least one hydraulic consumer (3) with hydraulic fluid (51) using a hydraulic system according to one of the preceding claims, wherein - a selection (i) of at least one hydraulic consumer (3) to be supplied with hydraulic fluid (51) is carried out by a user using at least one switching element (14) of a switching device - a switching state of at least one consumer connection (10, 11) of a valve distribution block (7) selected using the at least one switching element (14) is switched to be at least partially fluid-conducting upon release (ii) - a control (iii) of a supply of the at least one selected hydraulic consumer (3) with hydraulic fluid (51) is carried out by a user using at least one operating element (6) of a controllable valve (2) - a supply (iv) of hydraulic fluid (51) from a conveying device (12) to the at least one at least partially fluid-conducting switched consumer connection (10,11) and at least one hydraulic consumer (3) connected thereto., 12. Hydraulic lifting device (1), preferably a crane, particularly preferably a timber crane for loading timber or a loading crane, with a hydraulic system according to one of claims 1 to 10.

13. Hydraulic lifting device according to the preceding claim, wherein the hydraulic lifting device (1) has at least - a base (19) and - an arm system (20), wherein the arm system (20) is mounted in or on the base (19), preferably rotatable about a substantially vertical axis of rotation (z), wherein the at least one distributor valve block (7) is arranged in the base (7) and the at least one operating element (6) for controlling the at least one controllable valve (2), preferably together with the at least one controllable valve (2), is arranged in or on the arm system (20).

14. Hydraulic lifting device (1) according to one of claims 12 or 13, wherein the at least two switchable consumer connections (10, 11) of the at least one distributor valve block (7) can be switched between a substantially blocking and an at least partially fluid-conducting switching state by means of at least one user-operable switching element (14) of at least one switching device, wherein the at least one switching element (14), preferably together with the at least one operating element (6), is arranged in or on the arm system (20).

15. Vehicle (21) with a lifting device (1) according to one of claims 12 to 14.

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