Emergency operation valve block for mobile crane

Abstract

To provide an emergency operating valve block.SOLUTION: An emergency operating valve block (1) comprises a drive port (2) for hydraulically connecting a valve block to an emergency drive of a mobile crane, at least two drive mechanism ports (3A, 3B, and 3C) each hydraulically connecting the valve block to one drive of the mobile crane, at least two closure valves (4A, 4B, and 4C) assigned to one of the drive mechanism ports, respectively, and designed to selectively open or close the hydraulic connection between the drive ports and the drive mechanism port respectively assigned to the drive ports, and an actuation valve (5) designed to selectively reverse the hydraulic connection between a pressure side (2A) and a return side (2B) of the drive ports and the corresponding side of the drive mechanism ports. The present invention relates to a mobile crane equipped with the emergency operating valve block.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a valve block that can reliably supply hydraulic fluid to a crane drive mechanism by supply from an independent emergency power source when the main power supply to the crane drive mechanism is interrupted. The present invention also relates to a mobile crane equipped with such a valve block and capable of supplying hydraulic fluid to the crane drive mechanism through supply from an emergency power source using the valve block.

Background Art

[0002] The functions of a crane include, for example, raising and lowering a load in contact with a suspension cable, luffing in or out a boom of the crane, and rotating an upper structure of the crane with respect to a crane chassis. Usually, the functions of a crane are performed by a hydraulic unit such as a hydraulic motor or a hydraulic cylinder in a mobile crane. The latter hydraulic cylinder is sequentially driven by a hydraulic pump connected to the hydraulic cylinder via a hydraulic conduit in order to supply a volume flow of hydraulic fluid. In order to enable the essential functions of the crane to continue in case of damage, it is desirable to provide a drive system independent of the main drive system, and in some cases, it is even a legal requirement.

[0003] The so-called "transformer" is an example of such an independent power source and is essentially composed of a combination of a gear motor and a pump that is driven by an external hydraulic source and supplies drive output to a gear pump. The external hydraulic source can be provided, for example, by another crane or by a hydraulic unit called a "power pack". The gear pump can, for example, recover hydraulic fluid from a tank in the upper structure of the receiving crane and supply hydraulic pressure and volume flow to the drive mechanism to be supplied. Since this is not related to the hydraulic main drive system, the drive mechanism is driven with reduced output.

[0004] Conventional emergency drive systems have a number of valves. The number of valves needs to be operated in a manually and precisely defined manner in order to operate the desired drive mechanism in the desired way. Also, conventionally, these systems are individually adapted to the crane and are constructed from a number of hydraulic components. The number of hydraulic components are often attached together with pipes in a manner that is unclear to the operator. Therefore, these systems usually tend to show undesirable leaks and occupy a fair amount of installation space. The unclear arrangement of these systems often leads to incorrect operation.

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to improve this, and to provide a device that can be easily understood by an operator, is compact and requires little maintenance. With this device, individual crane drive mechanisms can be connected to the emergency drive unit and driven by the emergency drive unit.

Means for Solving the Problems

[0006] The object is achieved by a valve block according to the present invention. The valve block includes a drive port for hydraulically connecting the valve block to the emergency drive unit of a mobile crane, at least two drive mechanism ports for hydraulically connecting the valve block to one drive mechanism of the mobile crane respectively, at least two shut-off valves (4A, 4B, 4C) respectively assigned to one of the drive mechanism ports and designed to selectively open or close the hydraulic connection between the drive port and the drive mechanism port respectively assigned to the drive port, an operating valve designed to selectively reverse the hydraulic connection between the pressure side and the return side of the drive port and the corresponding side of the drive mechanism port, and comprises.

[0007] According to the present invention, individual valves are integrated into a compact unit. Therefore, it is possible to omit providing a pipe or even a tube between individual valves, unlike the corresponding devices of the prior art. Alternatively, individual valves and other hydraulic components are also hydraulically connected by flow paths formed within the body of the valve block. This can significantly reduce not only the maintenance cost but also the installation volume occupied by the valve system, as compared with known systems in which pipes or tubes are provided between valves.

[0008] The valve block that houses the individual valves does not necessarily need to be realized as a single body. Instead, it can be configured modularly and include a plurality of module bodies that are hydraulically connected to each other. At this time, in order to adapt the valve block to different installation situations, for example, different types of cranes having different types and numbers of crane drive mechanisms, the valve block according to the present invention can be modified, for example. Also, individual hydraulic components can be not only removed from the rest of the valve block for maintenance or repair but also replaced with new components.

[0009] According to one embodiment, the valve block includes drive mechanism ports for at least two of the following crane drive mechanisms. - A slewing mechanism that rotates the upper structure of the crane with respect to the crane chassis - A luffing mechanism that raises and lowers the boom of the crane - A hoisting mechanism that raises and lowers a load suspended by a suspension cable

[0010] The valve block according to the present invention can provide a drive mechanism port for an arbitrary crane drive mechanism in order to connect the arbitrary crane drive mechanism to an emergency drive unit.

[0011] According to another embodiment, the closing valve and / or the operating valve are designed to be operated by a hand lever. The operation of the closing valve is particularly configured to suppress the simultaneous opening of a plurality of closing valves.

[0012] Each valve can have a handle lever. By means of the handle lever, an operator can move the valve to a desired position. To prevent incorrect operation, the lever can be designed such that when it is moved by the operator to the position where the associated valve is opened, i.e., the position where the corresponding crane drive mechanism is connected to the emergency drive unit, one lever physically obstructs the operation of each other lever.

[0013] Therefore, a hydraulic connection can exist only between the emergency drive unit and one crane drive mechanism. As a result, uncontrollable displacement by other crane drive mechanisms cannot occur.

[0014] Also, a common handle lever for the closing valves can be provided. Each of the closing valves has a tool interface to which the handle lever can be removably coupled. Also in this way, a situation where a plurality of valves are opened simultaneously and a hydraulic connection exists between a plurality of crane drive mechanisms and the emergency drive unit can be avoided. The lever needs to be removed from the previously operated valve first before being connected to the valve to be opened. This provides another instruction to instruct the operator to first close the previously operated valve.

[0015] As another method, the coupling between the handle lever provided together and the individual valves can be made such that the lever can be removed from the valve only when the valve is in the closed position.

[0016] The operation of the valve block can be further simplified by having the handle lever or the tool interface of the closing valve be arranged and / or aligned in the same way, particularly adjacent to each other, on the valve block. In this way, the operator can simultaneously identify all the available valves and / or their operating levers. When the valves are arranged in the same way, the operating position of each of all the valves can also be identified simultaneously. For example, the valves can be arranged such that a specific spatial orientation of the handle lever and / or the tool interface indicates the same operating position, such as "open" or "closed", for all the valves.

[0017] The handle lever or the tool interface of the closing valve can also be mechanically fixed at the position of the handle lever or the tool interface, particularly at the position that closes the hydraulic connection between the drive port and each drive mechanism port assigned to the drive port. This can prevent the individual valves from being uncontrollably opened.

[0018] To easily clarify the operating position of the valve, the closing valve, particularly the tool interface or the handle lever of the closing valve, can represent a position indicator in a concave shape or a protruding shape on the tool interface or the handle lever. In particular, when all the valves are arranged and / or aligned in the same way, the positions of all the valves can be immediately understood.

[0019] Any suitable design of the valve can be considered to open and / or close the hydraulic connection between the drive port and each drive mechanism port. In the present invention, rotary slide valves are a preferred embodiment of the shut-off valve because of their compact design. The shut-off valve can also be formed as a 6 / 2-way valve capable of connecting six hydraulic ports to two different valve positions respectively. In principle, any suitable embodiment can also be considered for the operating valve. However, also in the operating valve, rotary slide valves are compact and a preferred embodiment. The operating valve can also be formed as a 5 / 3-way valve that interconnects five hydraulic ports to three different positions.

[0020] The function of the shut-off valve assigned to each of the drive mechanism ports is to open and / or close the hydraulic connection between the drive port and each drive mechanism port. Therefore, the crane drive mechanism to be driven by the emergency drive can be pre-selected by the shut-off valve. Here, the operating valve can be assigned not only the role of determining the moving direction or rotational direction of each driven crane drive mechanism, but also the role of providing an additional way to close the hydraulic connection between the drive port and each drive mechanism port. That is, when the crane drive mechanism to be driven is selected by the shut-off valve, the hydraulic connection can ultimately be opened by opening the operating valve in a direction corresponding to the desired operating direction of the crane drive mechanism to directly drive the corresponding crane drive mechanism by the emergency drive.

[0021] The operating direction of the crane drive mechanism is determined according to which hydraulic supply conduit of the drive mechanism is connected to the pressure side and / or the return side of the drive port via the operating valve. In order to utilize the function of the operating valve at all drive mechanism ports, an operating valve can be arranged between the drive port and the closed valve in the hydraulic connection between the drive port and the drive mechanism port. Alternatively, an individual operating valve can also be provided for each drive mechanism port. The operating valve is arranged between the corresponding closed valve and the drive port assigned to the closed valve.

[0022] In other embodiments, the operating valve in the basic position, supplies the supply pressure to at least one of the closed valves, and in particular enables the circulation of the hydraulic fluid from the pressure side to the return side of the drive port, in the open position, supplies the operating pressure to the closed valve, and in particular, in an intermediate position located between one of the basic position and the open position, supplies the supply pressure to at least one of the closed valves, and in particular prevents the circulation of the hydraulic fluid from the pressure side to the return side of the drive port, can be designed to perform.

[0023] Also, the operating valve can be designed not to supply the supply pressure to at least one closed valve when in the basic position.

[0024] For the function of individual cranes, the valve block can be provided with one or more lowering brake valves that suppress the return operation of the crane drive mechanism due to gravity. The valve block can be provided with at least one lowering brake valve designed to selectively open or close the hydraulic connection between the return side of the corresponding drive mechanism port and the drive port. The operating valve can also supply the operating pressure to the lowering brake valve or a plurality of lowering brake valves.

[0025] A valve block of one embodiment includes at least one hydraulic connection for recovering leakage from a valve that can be designed as a rotary sliding valve. The hydraulic connection serves to return the hydraulic fluid leaking from at least one of the closed valves and / or the operating valve to the drive port.

[0026] Another aspect of the present invention relates to a mobile crane comprising an emergency drive unit, at least two crane drive mechanisms assigned in particular to the superstructure, and an emergency operation valve block of one of the foregoing embodiments.

Brief Description of the Drawings

[0027] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The present invention can comprise any of the features described herein, individually or in any convenient combination.

[0028]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0029] FIG. 1 shows a valve block 1 according to the present invention. The valve block 1 includes a base body 10. Three closed valves 4A, 4B, 4C, an operating valve 5, and a lowering brake valve 9 are attached to the base body 10, and their internal fluid passages are in fluid connection with the internal fluid passage of the base body 10. Therefore, there is no need to provide pipes or tubes between the individual hydraulic components of the valve block 1 according to the present invention. Instead, in this case, the hydraulic fluid is "directly" transferred between the individual components connected to each other via the seal contact surfaces.

[0030] The valve block shown in Fig. 1 comprises three similar shut-off valves 4A, 4B, 4C. Each shut-off valve 4A, 4B, 4C is assigned to a crane drive mechanism, for example, the slewing mechanism, the luffing mechanism, and the hoisting mechanism of a mobile crane. For this purpose, each shut-off valve 4A, 4B, 4C is hydraulically connected to a corresponding drive mechanism port 3A, 3B, 3C. Only three of the drive mechanism ports 3A, 3B, 3C, which are arranged on the front side of the base body 10, are shown in Fig. 1. The drive mechanism ports 3A, 3B, 3C are likewise connected to the individual drive mechanisms of the crane.

[0031] The shut-off valves 4A, 4B, 4C are similarly designed and arranged in the same row on the base body 10. The shut-off valves 4A, 4B, 4C can be operated by a handle lever (not shown) detachably coupled to each tool interface 7.

[0032] The position of each valve 4A, 4B, 4C is indicated by a slot 8 machined in the end face of the tool interface 7. Here, a legend affixed to the base body 10 serves to understand the position of the slot 8. When the slot 8 is vertical and in the installed position, the normal position for the normal operation of the crane is represented and the hydraulic connection to the drive mechanism ports 3A, 3B, 3C is closed. When the slot 8 is horizontal, the corresponding shut-off valve 4A, 4B, 4C is open and in the emergency operation mode, hydraulic fluid is supplied to the crane drive mechanism connected to the corresponding drive mechanism port 3A, 3B, 3C.

[0033] To prevent the hydraulic fluid from being uncontrollably supplied to the crane drive mechanism via the drive mechanism ports 3A, 3B, 3C, each individual tool interface 7 can be mechanically fixed in position, for example, by the bent pins shown in Fig. 1, when the valves 4A, 4B, 4C are in the closed position.

[0034] In addition, the valve block 1 is provided with an operating valve 5. The operating valve 5 is connected to each of the closing valves 4A, 4B, 4C on one hand and to the drive port 2 on the other hand. The hydraulic connection between the closing valves 4A, 4B, 4C and the drive port 2 is closed or opened according to the position of the hand lever 6. Also, the pressure side 2A and the return side 2B of the drive port 2 are assigned to the respective sides of the drive mechanism ports 3A, 3B, 3C via the operating valve 5 so as to predetermine the moving direction of the crane drive mechanism.

[0035] In order to suppress the unintended displacement caused by the crane drive mechanism due to gravity, the valve block 1 is provided with a lowering brake valve 9 for the corresponding drive mechanism ports 3A, 3B, 3C.

[0036] As shown in FIG. 1, the closing valves 4A, 4B, 4C, the operating valve 5, and the lowering brake valve 9 are screwed to the base body 10, and their respective contact surfaces seal the fluid passages extending through each module body. This module structure of the valve block 1 enables not only the quick replacement of individual parts but also the selective attachment of different parts according to the individual installation situation of the valve block 1, for example, in different types of cranes.

[0037] FIG. 2 is a hydraulic circuit diagram of the valve block 1 shown in FIG. 1. With reference to FIG. 2, the functions and operations of the valve block 1 will be described.

[0038] Basic position The volumetric flow of the hydraulic fluid is supplied by a transformer via the pressure side 2A of the drive port 2. In the basic position of the operating valve 5 shown in FIG. 2, the hydraulic fluid circulates through the pressure side 2A. Here, the pressure limiting valve DBV2 opens at about 30 bar to limit the supply pressure. When the operating valve 5 is in the basic position, the supply pressure is applied to all the closing valves 4A, 4B, 4C.

[0039] Explanation of the function of the slewing mechanism When the shut-off valve 4A is opened, the supply pressure is applied to a valve (not shown) for connecting to the brake BR of the slewing mechanism via the shut-off valve 4A.

[0040] When the operating valve 5 is moved to the uppermost position and opened, the operating pressure is immediately applied to all the shut-off valves 4A, 4B, 4C. The hydraulic fluid passes through the opened shut-off valve 4A, reaches the slewing mechanism motor via port H5, and slews the upper structure. The hydraulic fluid returning from the motor returns to the hydraulic fluid tank via port H4, shut-off valve 4A, operating valve 5, pressure limiting valve DBV2, and the return side 2B of the drive port 2. The operating pressure is limited to 195 bar by the pressure limiting valve DBV1.

[0041] Description of the function of the hoisting mechanism When the shut-off valve 4B is opened while the operating valve 5 is closed, the hydraulic fluid flows to port H2 at the supply pressure, and the hoisting mechanism brake connected to port H2 is opened.

[0042] When the operating valve 5 is opened (uppermost position), the hydraulic fluid is sent to the hoisting mechanism motor at high pressure. Thereby, the load is lifted. The hydraulic fluid returning from the motor flows through the shut-off valve 4B, operating valve 5, and pressure limiting valve DBV2, and returns to the tank. The operating pressure is limited to 195 bar by the pressure limiting valve DBV1.

[0043] To lower the load, the operating valve 5 is moved to its lowermost position. Thereby, the hydraulic fluid returning from the motor is applied to the lowering brake valve 9A. An operating pressure is additionally applied to the lowering brake valve 9A via the pressure side 2A. The lowering brake valve 9A is opened by this additional pressure. Therefore, the hydraulic fluid for lifting the load can flow out toward the tank via the operating valve 5 and the pressure limiting valve DBV2. The load descends. The hydraulic fluid returning from the motor passes through the shut-off valve 4B, operating valve 5, and pressure limiting valve DBV2, and returns to the tank.

[0044] Description of the function of the roughing mechanism When raising the boom of the crane, the hydraulic fluid passes through the opened operation valve 5 (topmost position) at high pressure, through the opened closing valve 4C, and reaches port H8 and the luffing cylinder connected to the port H8. As a result, the luffing cylinder extends and the boom rises. The hydraulic fluid returning from the cylinder flows through the valve manifold of the crane (not shown) and returns to the tank.

[0045] When lowering the boom of the crane, the operation valve 5 is moved to its lowermost position. As a result, the hydraulic fluid passes through orifice N2 and reaches the pressure reducing valve 9B. The luffing cylinder is slowly retracted and the boom descends. The hydraulic fluid returning from the cylinder flows through the valve manifold of the crane (not shown) and returns to the tank.

[0046] According to a first aspect of the present invention, an emergency operation valve block (1), a drive port (2) for hydraulically connecting the valve block (1) to an emergency drive unit of a mobile crane, at least two drive mechanism ports (3A, 3B, 3C) for hydraulically connecting the valve block (1) to one drive mechanism of the mobile crane respectively, at least two shut-off valves (4A, 4B, 4C) respectively assigned to one of the drive mechanism ports (3A, 3B, 3C) and designed to selectively open or close the hydraulic connection between the drive port (2) and the drive mechanism port (3A, 3B, 3C) respectively assigned to the drive port, an operating valve (5) designed to selectively reverse the hydraulic connection between the pressure side (2A) and the return side (2B) of the drive port (2) and the corresponding sides of the drive mechanism ports (3A, 3B, 3C), is provided, an emergency operation valve block is provided.

[0047] According to a second aspect of the present invention, the drive mechanism ports (3A, 3B, 3C) are provided in at least two of the drive mechanisms of a slewing mechanism for rotating the upper structure of the crane relative to the chassis of the crane, a luffing mechanism for raising and lowering the boom of the crane, and a hoisting mechanism for raising and lowering a load suspended by a suspension cable respectively, and the emergency operation valve block according to the first aspect is provided.

[0048] According to a third aspect of the present invention, the shut-off valves (4A, 4B, 4C) and / or the operating valve (5) are designed to be operated by a handle lever (6), the operation of the shut-off valves (4A, 4B, 4C) is particularly designed to suppress the simultaneous opening of a plurality of the shut-off valves (4A, 4B, 4C), the emergency operation valve block according to the first or second aspect is provided.

[0049] According to a fourth aspect of the present invention, it further comprises a handle lever provided commonly for the shut-off valves (4A, 4B, 4C), each of the shut-off valves (4A, 4B, 4C) has a tool interface (7) to which the handle lever can be detachably coupled, the emergency operation valve block according to the third aspect is provided.

[0050] According to a fifth aspect of the present invention, the tool interface (7) of the handle lever or the closing valve (4A, 4B, 4C) provides an emergency operation valve block as described in the third or fourth aspect, which is arranged and / or aligned in the same way, particularly adjacent to each other, on the valve block (1).

[0051] According to a sixth aspect of the present invention, the tool interface (7) of the handle lever or the closing valve (4A, 4B, 4C) is mechanically fixable at the position of the handle lever or the tool interface, and in particular, at the position of the handle lever or the tool interface that closes the hydraulic connection between the drive port (2) and the drive mechanism ports (3A, 3B, 3C) respectively assigned to the drive port, provides an emergency operation valve block as described in any one of the third to fifth aspects, which is mechanically fixable.

[0052] According to a seventh aspect of the present invention, the closing valve (4A, 4B, 4C), in particular, the tool interface (7) or the handle lever of the closing valve, provides an emergency operation valve block as described in any one of the first to sixth aspects, which represents a position indicator (8), particularly in a concave or protruding shape, on the tool interface (7) or on the handle lever.

[0053] According to an eighth aspect of the present invention, at least one of the closing valves (4A, 4B, 4C), in particular, all of the closing valves (4A, 4B, 4C), are formed as rotary slide valves and / or 6 / 2-way valves, and provides an emergency operation valve block as described in any one of the first to seventh aspects.

[0054] According to a ninth aspect of the present invention, the operating valve (5) is formed as a rotary slide valve and / or 5 / 3-way valve, and provides an emergency operation valve block as described in any one of the first to eighth aspects.

[0055] According to a tenth aspect of the present invention, the operating valve (5) is located between the drive port (2) and the closing valve (4A, 4B, 4C) in the hydraulic connection between the drive port (2) and the drive mechanism ports (3A, 3B, 3C), and provides an emergency operation valve block as described in any one of the first to ninth aspects.

[0056] According to an eleventh aspect of the present invention, the operating valve (5) in the basic position, supplies the supply pressure to at least one of the closing valves (4A, 4B, 4C), and in particular, enables the circulation of the hydraulic fluid from the pressure side (2A) to the return side (2B) of the drive port (2), and / or In the open position, supplying operating pressure to the shut-off valves (4A, 4B, 4C), and / or In particular, in an intermediate position located between one of the basic position and the open position, supplying supply pressure to at least one of the shut-off valves (4A, 4B, 4C), and in particular, preventing the circulation of hydraulic fluid from the pressure side (2A) to the return side (2B) of the drive port (2). It is designed to perform Provide the emergency operation valve block according to any one of the first to tenth aspects.

[0057] According to the twelfth aspect of the present invention, when the operating valve (5) is in the basic position, provide the emergency operation valve block according to the eleventh aspect, in which the supply pressure is not supplied to at least one of the shut-off valves (4A, 4B, 4C).

[0058] According to the thirteenth aspect of the present invention, It further includes at least one lowering brake valve (9) assigned to one of the drive mechanism ports (3A, 3B, 3C). The lowering brake valve (9) is designed to selectively open or close the hydraulic connection between the return side (2B) of the drive mechanism port (3A, 3B, 3C) and the drive port (2). In particular, the operating valve (5) supplies operating pressure to the lowering brake valve (9). Provide the emergency operation valve block according to any one of the first to twelfth aspects.

[0059] According to the fourteenth aspect of the present invention, provide the emergency operation valve block according to any one of the first to thirteenth aspects, which further includes a hydraulic connection for returning the hydraulic fluid leaked from at least one of the shut-off valves (4A, 4B, 4C) and / or the operating valve (5) to the drive port (2).

[0060] According to the fifteenth aspect of the present invention, An emergency drive unit, In particular, at least two crane drive mechanisms assigned to the upper structure, And the emergency operation valve block (1) according to any one of the first to fourteenth aspects. Provide a mobile crane comprising

Claims

1. An emergency operation valve block (1), a drive port (2) for hydraulically connecting the valve block (1) to an emergency drive part of a mobile crane, at least two drive mechanism ports (3A, 3B, 3C) for hydraulically connecting the valve block (1) to one drive mechanism of the mobile crane respectively, at least two shut-off valves (4A, 4B, 4C) respectively assigned to one of the drive mechanism ports (3A, 3B, 3C) and designed to selectively open or close a hydraulic connection between the drive port (2) and the drive mechanism ports (3A, 3B, 3C) respectively assigned to the drive port, an operating valve (5) designed to selectively reverse a hydraulic connection between a pressure side (2A) and a return side (2B) of the drive port (2) and corresponding sides of the drive mechanism ports (3A, 3B, 3C), comprising, the shut-off valves (4A, 4B, 4C) are designed to be operated by a hand lever (6), the operation of the shut-off valves (4A, 4B, 4C) is such that simultaneous opening of a plurality of the shut-off valves (4A, 4B, 4C) is suppressed, an emergency operation valve block.

2. The drive mechanism ports (3A, 3B, 3C) are respectively provided in at least two of a slewing mechanism for rotating an upper structure of the crane relative to a chassis of the crane, a luffing mechanism for raising and lowering a boom of the crane, and a hoisting mechanism for raising and lowering a load suspended by a suspension cable, the emergency operation valve block according to claim 1.

3. The operating valve (5) is designed to be operated by a hand lever (6), the emergency operation valve block according to claim 1.

4. further comprising one hand lever common to the shut-off valves (4A, 4B, 4C), each of the shut-off valves (4A, 4B, 4C) has a tool interface (7) to which the hand lever can be detachably coupled, the emergency operation valve block according to claim 3.

5. The hand lever or the tool interface (7) of the shut-off valves (4A, 4B, 4C) is arranged and / or aligned adjacent to each other on the valve block (1) in the same way, the emergency operation valve block according to claim 3 or 4.

6. The tool interface (7) of the handle lever or the closing valve (4A, 4B, 4C) is mechanically fixable at the position of the handle lever or the tool interface that closes the hydraulic connection between the drive port (2) and the drive mechanism ports (3A, 3B, 3C) respectively assigned to the drive port. The emergency operation valve block according to claim 3 or 4.

7. The tool interface (7) or the handle lever of the closing valve has a position indicator (8) on the tool interface (7) or on the handle lever. The emergency operation valve block according to any one of claims 1 to 4.

8. At least one of the closing valves (4A, 4B, 4C) is formed as a rotary slide valve and / or a 6 / 2-way valve. The emergency operation valve block according to any one of claims 1 to 4.

9. The operating valve (5) is formed as a rotary slide valve and / or a 5 / 3-way valve. The emergency operation valve block according to any one of claims 1 to 4.

10. The operating valve (5) is located between the drive port (2) and the closing valve (4A, 4B, 4C) in the hydraulic connection between the drive port (2) and the drive mechanism ports (3A, 3B, 3C). The emergency operation valve block according to any one of claims 1 to 4.

11. The operating valve (5) In the basic position, supply pressure is supplied to at least one of the closing valves (4A, 4B, 4C), enabling the circulation of hydraulic fluid from the pressure side (2A) to the return side (2B) of the drive port (2), and / or, In the open position, supply operating pressure to the closing valve (4A, 4B, 4C), and / or, In an intermediate position located between one of the basic position and the open position, supply pressure is supplied to at least one of the closing valves (4A, 4B, 4C), preventing the circulation of hydraulic fluid from the pressure side (2A) to the return side (2B) of the drive port (2), Is designed to perform The emergency operation valve block according to any one of claims 1 to 4.

12. When the operating valve (5) is in the basic position, the supply pressure is not supplied to at least one of the closing valves (4A, 4B, 4C). The emergency operation valve block according to claim 11.

13. Further comprising at least one lowering brake valve (9) assigned to one of the drive mechanism ports (3A, 3B, 3C), The lowering brake valve (9) is designed to selectively open or close a hydraulic connection between the return side (2B) of the drive mechanism port (3A, 3B, 3C) and the drive port (2), The actuating valve (5) supplies actuating pressure to the lowering brake valve (9), The emergency operation valve block according to any one of claims 1 to 4.

14. The emergency operation valve block according to any one of claims 1 to 4, further comprising a hydraulic connection for returning the hydraulic fluid leaked from at least one of the closing valves (4A, 4B, 4C) and / or the actuating valve (5) to the drive port (2).

15. An emergency drive unit, At least two crane drive mechanisms assigned to the superstructure, The emergency operation valve block (1) according to any one of claims 1 to 4, A mobile crane comprising.

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