Mobile hydraulic working machine comprising emergency stop valves, and method for controlling a mobile hydraulic working machine
Patent Information
- Application Number
- EP2023720236
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-06-03
- Filing Date
- 2023-04-06
- Publication Date
- 2025-04-09
AI Technical Summary
Mobile hydraulic work machines, such as construction and forestry equipment, face significant oil leaks due to aging hoses and external mechanical damage, leading to environmental pollution and high replacement costs, as existing solutions primarily interrupt the hydraulic system at the attachment, causing uncontrolled movements and large oil losses.
Incorporating emergency stop valves in the hydraulic system, particularly in the boom assembly and superstructure, to quickly shut off hydraulic lines in case of leaks, with electronically controlled solenoid valves and sensors for automatic detection and actuation, ensuring oil containment and allowing continued machine operation except for the affected section.
Prevents large-scale oil leakage and environmental pollution by maintaining the shut-off position until the leak is addressed, reducing costs and ensuring safety, with the ability to automatically or manually activate the emergency stop valves for efficient oil containment.
Smart Images
Figure 1.1
Abstract
Description
[0001] Mobile hydraulic working machine with emergency stop valves and a method for controlling a mobile hydraulic working machine
[0002] The present invention relates to a mobile hydraulic working machine having the features of the preamble of claim 1 and to a method for controlling a mobile hydraulic working machine having the features of the preamble of claim 10.
[0003] Mobile hydraulic work machines, especially construction machines, are used in a variety of ways on construction sites for demolition and demolition work. Such mobile work machines are also used in civil engineering and forestry. Examples of mobile work machines include cranes, excavators, material handlers, forestry machines, and the like. Long-arm boom excavators, or demolition excavators, are used in demolition. The long booms and sticks make mobile hydraulic construction machines a good tool for using hydraulic attachments for the respective purpose, even at heights of over 20 m. During operation of mobile hydraulic construction machines, the hydraulic hoses that make up the hydraulic system of the attachments are exposed to external influences due to aging processes or weathering, which can cause damage to the hydraulic hoses.Further, and much more unpredictable, sources of damage include external mechanical impacts on hydraulic hoses caused by work in confined spaces. The excavator operator cannot see every part of the boom of the mobile hydraulic construction machine during operation, so hydraulic hoses can get caught on sharp objects on the construction site, punctured, cut, or crushed, resulting in damage. Due to unavoidable aging processes and unpredictable external influences, oil leaks can occur in hydraulic hoses during normal operation of the construction machine.It is known, among other things, from published patent application EP 25 47 912 to interrupt lines in the hydraulic system on the attachment that have been damaged by pipe bursts. This prevents the attachment from making uncontrolled movements, remains in a rigid position, and avoids safety risks on the construction site. However, this only interrupts the hydraulic system on the side of the attachment, which is critical because the long booms and sticks of mobile hydraulic construction machines also require long hydraulic lines that must be routed to the end of the stick and to the attachment. This means that in the event of an oil leak, more than 400 liters of oil can often escape in less than half a minute and reach the bottom of the construction site. The oil loss not only means additional costs for replacing the lost oil, but also considerable environmental pollution on the construction site.
[0004] The same applies to the use of harvesters in forestry, some of which have long outriggers with pliers for gripping tree trunks, which, in addition to the hydraulic unit for the pliers, are also equipped with a hydraulic motor for rotating the pliers.
[0005] The invention is therefore based on the object of providing a cost-saving and environmentally friendly mobile hydraulic working machine and a method for controlling such a working machine.
[0006] This object is achieved by a mobile hydraulic working machine having the features of claim 1 and by a method for controlling a mobile hydraulic working machine having the features of claim 10.
[0007] Accordingly, a mobile hydraulic work machine, in particular a construction machine, comprising a superstructure, a substructure, a boom assembly, preferably with a boom (optionally with an intermediate boom) and with a stick, an attachment connected to the stick, and a hydraulic system for moving the boom assembly and the attachment, is provided. The hydraulic system has at least one pump and a valve block, wherein the valve block is designed to be able to regulate the oil flow of at least one, preferably at least two hydraulic lines connecting the hydraulic consumer, in particular the attachment, to the pump in order to control a hydraulic consumer, in particular the attachment.At least one emergency stop valve is assigned to each of the hydraulic lines, which is designed to close the hydraulic line in an emergency, wherein the at least one emergency stop valve is arranged in the region of the boom assembly in the hydraulic line and / or in the superstructure on the flow side of the valve block remote from the pump.
[0008] The at least one emergency stop valve makes it possible to close the hydraulic line(s) in the event of a leak, thereby largely preventing hydraulic oil from escaping. Emergency stop valves can also comprise shut-off devices such as slide valves or ball valves. Retrofitting the emergency stop valves in the area of the superstructure is particularly easy. The use of emergency stop valves in the area of the stick is advantageous, as this is of great use in the event of a leak in the area between the boom assembly and the attachment. If the hydraulic consumer is a single-acting hydraulic cylinder, for example, only one hydraulic line can be provided that has an emergency stop valve. If the hydraulic consumer is a double-acting hydraulic cylinder, two hydraulic lines are provided, which are connected to the valve block and each have at least one emergency stop valve.If the hydraulic consumer is the attachment, the valve block can be an additional valve block with a volume control valve that controls the volume flow to the attachment.
[0009] Preferably, the at least one, in particular at least two hydraulic lines are located in a protected area on the upper side of the boom or are formed by channels, with the respective emergency stop valve located in this protected area. A protected area means that the hydraulic line is a rigid pipe, in particular made of metal, that is protected from external influences. These protected areas must be distinguished from areas of the hydraulic line with flexible hoses, which can easily tear or become damaged.
[0010] The hydraulic line is preferably fastened at a first fastening point to the hydraulic consumer, in particular the attachment, and at a second fastening point to the boom assembly, in particular the stick, and forms a flexible hose bend between the two fastening points, wherein the at least one emergency stop valve is preferably arranged in the area of the boom assembly or the stick outside the flexible hose bend. During regular work with the mobile hydraulic construction machine, oil leaks often occur at the flexible hose bends, as their nature makes them prone to, for example, getting caught in places on the construction site. However, the hose bends are indispensable for the use of the work machine, in particular the construction machine, since without the hose bends, large movements of the boom assembly and the attachments would not be possible.Closing at least one emergency stop valve and thus the hydraulic lines and the hydraulic system prevents further oil leakage in the event of a leak.
[0011] Preferably, the emergency stop valve is an electronically controlled solenoid valve, which is particularly cost-effective. The emergency stop valves can be 2-way valves, and the hydraulic system then includes at least one return line connecting the emergency stop valves to a hydraulic oil tank from which the hydraulic system is supplied by the pump. In this case, communication with the valve block is not necessary, since the flow of hydraulic oil through the hydraulic lines does not need to be interrupted in the area of the valve block.
[0012] In a further preferred embodiment, the mobile hydraulic work machine, in particular a construction machine, comprises an emergency stop device that communicates with the at least one emergency stop valve and / or optionally additionally with the valve block and is configured to close the at least one emergency stop valve upon actuation. The emergency stop device is preferably arranged in a driver's cab of the mobile hydraulic machine. If the driver of the mobile hydraulic construction machine detects a leak, he or she can actuate the emergency stop device and thus prevent the hydraulic oil from escaping further at the point of failure.
[0013] Preferably, at least one sensor is assigned to the at least one hydraulic line, which sensor is configured to detect a leak in the at least one hydraulic line, wherein the at least one sensor communicates with the emergency stop valves and / or the valve block. In this case, the emergency stop valves can be closed automatically in the event of a leak and a pressure drop in the hydraulic line.
[0014] In a preferred embodiment, the mobile hydraulic working machine is a construction machine, in particular a long-arm boom excavator, which has a reach height in a range of 15 m to 90 m and in particular a weight class between 25 t and 400 t.
[0015] Furthermore, a method for controlling a mobile hydraulic work machine, in particular a construction machine, comprising a superstructure, a substructure, a boom assembly with a stick, an attachment connected to the stick, and a hydraulic system for moving the boom assembly and the attachment, wherein the hydraulic system comprises at least one pump and one valve block, in particular an additional valve block, and at least one, in particular at least two hydraulic lines connecting the attachment to the pump, wherein the valve block is connected to the hydraulic line(s). The method comprises the following successive steps: a) detecting or occurrence of a leak in one of the hydraulic lines(s) between a hydraulic consumer, in particular the attachment and the valve block, b) switching or actuating and / or moving at least one
[0016] Emergency stop valve, which is arranged in the area of the boom assembly and / or in the superstructure on the flow side of the valve block remote from the pump in (one of) the hydraulic line(s) and thereby shuts off at least one hydraulic line, in particular at least two hydraulic lines.
[0017] It is preferable to ensure that the blocking position is maintained until the leak is remedied. After the leak is remedied, it is advantageous for the emergency stop valve to be returned to its initial state prior to the leak or to an initial position.
[0018] In contrast to other valves or valve assemblies that close off hydraulic lines, this method allows the mobile work machine to continue to be operated and moved except for the control section assigned to the leakage line. This method can prevent large quantities of hydraulic oil from escaping from a leak. Since it is ensured or can be ensured that the blocking position is maintained until the leak has been eliminated and the hydraulic line has been repaired, hydraulic oil can be reliably prevented from escaping from the hydraulic line. The emergency stop valve is preferably returned to the state it was in before the leak occurred and the line was blocked off without the need for tools and without replacing or renewing any parts / components of the emergency stop valve. The initial state is particularly preferably brought about automatically, for example after release by an operator.Such a release may include an input in an operator unit, an actuation of a switch (emergency off switch or emergency stop switch) or the like.
[0019] Preferably, the at least one emergency stop valve is a 2-way valve and the hydraulic system comprises at least one return line and in step b) of the method the following is provided:
[0020] - Connecting the hydraulic line to the return line by means of the emergency stop valve, wherein the return line is connected to a hydraulic oil tank from which the hydraulic system is supplied by the pump. Preferably, the method comprises the following step between steps a) and b):
[0021] - Actuating the valve block, in particular the additional valve block, and thereby shutting off the at least one (two) hydraulic line(s), wherein step b) is then carried out with a predetermined time delay.
[0022] Preferably, the method comprises detection by sighting an operator or by a sensor arranged in the hydraulic line.
[0023] Preferably, the mobile hydraulic construction machine comprises an emergency stop device that communicates with the emergency stop valves and / or the additional valve block and the method according to step a) comprises the following step:
[0024] - Manual operation of the emergency stop device by the operating personnel.
[0025] The mobile hydraulic construction machine can be designed as described above.
[0026] Two preferred embodiments of the invention are explained in more detail below with reference to the drawings. Identical or functionally identical components are provided with the same reference numerals in the figures. The figures show:
[0027] Figure 1 : a spatial representation of a mobile hydraulic
[0028] construction machinery,
[0029] Figure 2: a plan view of the mobile hydraulic construction machine from Figure 1,
[0030] Figure 3: a schematic representation of an embodiment of a
[0031] Hydraulic system of an attachment of the mobile hydraulic construction machine from Figure 1, as well as
[0032] Figure 4: a schematic representation of another embodiment of a hydraulic system of an attachment. Figure 1 shows a mobile hydraulic construction machine 1 in a preferred embodiment as a long-arm boom excavator with a substructure 2 that is connected to a superstructure 4 via a slewing mechanism 3 that can rotate about a slewing axis S. With the help of the slewing mechanism 3, a controlled slewing movement between the superstructure 4 and the substructure 2 about the slewing axis S is possible. In general, a distinction can be made between mobile excavators and crawler excavators. The substructure 2 can, on the one hand, have tires in a chassis, and this is referred to as a mobile excavator, although mobile excavators are only used in the weight class up to 25 t, and, on the other hand, have tracks, so that crawler excavators are used in all weight classes.Mobile and crawler excavators, as self-propelled land vehicles, are to be distinguished from other types of excavators, such as floating dredgers. In the preferred embodiment, the long-arm boom excavator 1 is implemented as a crawler excavator, which falls into a weight class typical for demolition work, between 25 t and 400 t. The superstructure 4 has a driver's cab 5 at its end in the direction of travel F (straight-line alignment) and a counterweight 6 opposite the driver's cab 5. Figures 1 and 2 show a three-link boom assembly 7, which is attached to the superstructure 4 next to or behind the driver's cab 5. The boom assembly 7 has three consecutive links 8, 9, 10. A first link 8, called boom, a second link 9, called intermediate boom, and a third link furthest from the superstructure, which is called stem 10, wherein two successive links are pivotally mounted on each other by means of bolts.The boom assembly 7 further comprises a boom cylinder 11, which can move the first link 8, and an intermediate boom cylinder 12, which can move the second link 9 of the boom assembly 7. Furthermore, a stick cylinder 22 is provided, which can be driven to move the stick 10. An attachment 14 is attached to the free end of the stick 10, through which a stick head pin 13 passes. This connection can preferably be established by a quick coupler. The attachment 14 and the quick coupler can also be pivoted about the pivot axis defined by the stick head pin 13. In this embodiment, the attachment 14 is a gripping tool; however, any hydraulic attachments, such as shears, can be used.
[0033] The mobile hydraulic construction machine 1 comprises a hydraulic system that, among other things, drives the boom cylinder 11 and the intermediate boom cylinder 12, as well as the stick cylinder 22, using hydraulic oil. The hydraulic oil flow and the associated movements are controlled and monitored by a main valve block of the hydraulic system (not shown) located in the superstructure 4. The main valve block comprises valves that regulate the supply of hydraulic oil to one of the hydraulic cylinders. Furthermore, the main valve block is responsible for controlling a hydraulic slewing drive of the slewing gear 3 and a hydraulic travel drive for the tracks of the substructure 2. Also belonging to the hydraulic system and located in the superstructure 4 are an auxiliary valve block 15, a hydraulic oil tank 16, and a hydraulic pump 17.The hydraulic pump 17 delivers the hydraulic oil of the hydraulic system and is connected to the main valve block and the auxiliary valve block 15 via a hydraulic connection. Multiple pumps can be used in the hydraulic system if the output of one pump is insufficient for the required application or if the system is to be designed redundantly. The auxiliary valve block 15 controls and regulates the flow of hydraulic oil to the attachment 14. Hydraulic lines 18 lead from the auxiliary valve block 15 to the attachment 14. Figure 1 shows only one hydraulic line 18; however, depending on the attachment used and the type of construction machine, there may be several, but at least two, hydraulic lines 18. The type of attachment 14 and the movement it can perform define the number of hydraulic lines 18 (used and connected).The hydraulic line 18 is formed in the area of the bolts 19 of the boom assembly 7, between the superstructure 4 and the first link 8, and between the first link 8 and the second link 9, and between the second link 9 and the stick 10, by flexible hose lines that are arranged in an arc shape, also called boom hose bends 20. A flexible hose bend 21 is also formed between a first attachment point on the attachment 14 and a second attachment point on the stick 10. The flexible boom hose bends 20 and the flexible hose bend 21 enable the individual links of the boom assembly 7 to pivot about the longitudinal axis of the bolts 19 without the hydraulic line 18 being interrupted or ruptured. The hose bend 21 and the boom hose bends 20 are formed for each additional hydraulic line 18 not shown here.The parts of the hydraulic line 18 that run centrally along the links of the boom assembly 7, far from the pivot axes or the pins 19, are formed by rigid metal pipes. The ends of the metal pipes are each connected to a flexible hose line to form the hydraulic line 18. The metal pipes represent a protected area in which the hydraulic line 18 is protected from external damage. In the illustrated hydraulic line 18, two emergency stop valves 23, 24 are located between the additional valve block 15 and the attachment 14. The emergency stop valves 23, 24 of the at least two hydraulic lines 18 are divided into first emergency stop valves 23 and second emergency stop valves 24 and are schematically shown as a rectangle in Figure 1. The first emergency stop valve 23 and the second emergency stop valve 24 can close the corresponding hydraulic line 18 at the respective position.This ensures that the emergency stop valve 23, 24 located on the side closest to the auxiliary valve block in the event of an oil leak prevents the hydraulic oil located between this emergency stop valve 23, 24 and the hydraulic pump 17 or the hydraulic oil tank 16 in the hydraulic lines 18 from escaping. The first emergency stop valve 23 is located in the superstructure 4 on the flow side of the auxiliary valve block 15 remote from the pump. The second emergency stop valve 24 is located in the hydraulic line 18 in the area of the boom 10 outside the hose bend 21. A position that is located in the flow direction immediately upstream or downstream of the flexible hose line in the area of the boom head bolt 13 is particularly preferred, as shown in Figure 1. Experience has shown that leaks in the hose lines frequently occur in the area of the boom head bolt 13.The previously described position of the second emergency stop valve 24 makes it possible to maintain the maximum possible amount of hydraulic oil in the hydraulic lines 18 in the event of such a leak. If an oil leak occurs in the hose bend 21, closing the second emergency stop valve 24 allows the oil in the hydraulic line 18 between the second emergency stop valve 24 and the additional valve block 15 to remain in the hydraulic lines 18, preventing any leakage. It is conceivable to use additional emergency stop valves, for example, to protect against leakage of the boom hose bends 20 of the second link 9. At least one emergency stop valve 23, 24 is required per hydraulic line 18. Even the first emergency stop valve 23 prevents the majority of the hydraulic oil from escaping in the event of a leak in the flexible hose line in the area of the boom head pin 13.The emergency stop valves 23, 24 are clearly different from conventional pipe rupture safety devices, which are now standard equipment in mobile hydraulic construction machinery. The pipe rupture safety devices (not shown) are installed on the attachment 14 and, in the event of a pipe rupture, prevent uncontrolled movements of the attachment 14 in order to protect operating personnel and construction site personnel. They maintain the pressure of the hydraulic oil in the attachment 14 or the working chambers of the hydraulic cylinders installed therein and allow the attachment 14 to remain in a rigid position. The emergency stop valves 23, 24 interrupt the hydraulic system at at least one point to the auxiliary valve block 15. The hydraulic oil in the hydraulic line between the rupture point and the emergency stop valve 23, 24 escapes. However, the emergency stop valve 23, 24 prevents the escape of large quantities of hydraulic oil and thus contributes to environmental protection during demolition work.The emergency stop valves can also be provided in hydraulic lines to other hydraulic consumers. The hydraulic consumer can be, for example, the boom cylinder 11, the intermediate boom cylinder 12, and / or the stick cylinder.
[0034] Figure 3 shows part of a merely schematically illustrated hydraulic system, which is used in particular to control the movement of the attachment 14. The hydraulic valves of the auxiliary valve block 15 are electrically pilot-controlled to move the attachment 14, which is not shown in the figure. The hydraulic pump 17 supplies the auxiliary valve block 15 with the required oil pressure to control the attachment 14 or its hydraulic cylinder. The auxiliary valve block 15 regulates the volume flow of the hydraulic oil through the four exemplary hydraulic lines 18 and can thus control the movement of the attachment 14. A first emergency stop valve 23 and a second emergency stop valve 24 are provided per hydraulic line 18. The first emergency stop valves 23 and the second emergency stop valves 24 are each located in two different sections of the hydraulic line 18.The boom hose bends 20 closest to the additional valve block and the flexible hose bends 21 in the area of the stick head bolt 13 are shown.
[0035] Firstly, the first emergency stop valves 23 are arranged in the superstructure 4, in a superstructure section of the respective hydraulic line 18, which is located on the flow side of the additional valve block 15 remote from the pump. Secondly, the second emergency stop valves 24 are arranged in a boom assembly section of the respective hydraulic line 18, which is located outside the superstructure 4 and in the area of the boom 10 outside the flexible hose bends 21, as already described above. The emergency stop valves 23, 24 are open during regular operation of the mobile hydraulic construction machine 1, so that the hydraulic oil can flow unhindered through the emergency stop valves 23, 24. The emergency stop valves 23, 24 are controlled by an emergency stop actuation device 25. When the emergency stop actuation device 25 is actuated, the hydraulic lines 18 are closed by means of the emergency stop valves 23, 24, and the hydraulic oil flow is stopped.The emergency stop device 25 communicates electronically with the additional valve block 15 and switches the emergency stop valves 23,24.
[0036] After a leak is detected in one of the hydraulic lines 18 between the attachment 14 and the auxiliary valve block 15, the emergency stop valves 23, 24 are activated and the hydraulic lines 18 are shut off. Figure 3 shows the closed state of the emergency stop valves 23, 24, which is achieved by actuating the emergency stop actuation device 25.
[0037] In a preferred embodiment, the emergency stop valves 23, 24 are electronically controlled solenoid valves.
[0038] In a preferred embodiment, the leak is detected by the operating personnel, who then actuates the emergency stop device 25, and the emergency stop valves 23, 24 are switched and shut off the hydraulic lines 18. Detection can also be performed by a sensor associated with the hydraulic lines 18, and the emergency stop device 25 can then be actuated automatically.
[0039] In a preferred embodiment, the additional valve block 15 is first activated by actuating the emergency stop actuation device 25, and the additional valve block 15 shuts off the at least two hydraulic lines 18. Subsequently, the emergency stop valves 23, 24 are switched with a predeterminable time delay, and the hydraulic lines 18 are closed.
[0040] Figure 4 shows a further embodiment of a part of the hydraulic system, largely analogous to Figure 3. In this case, the attachment 14 is hydraulically pilot-controlled by a low-pressure line. The boom hose bends 20 and the hose bends 21 have been omitted. The differences are discussed below. In the embodiment shown in Figure 4, the first emergency stop valves 23 in the superstructure section of the hydraulic lines 18 are implemented as 2-way valves 26, which can be connected to the hydraulic oil tank 16 of the hydraulic system via a return line 27. During regular operation, the second emergency stop valves 24, which in one embodiment are electronically controlled solenoid valves, are open in the boom assembly section, and the 2-way valves 26 in the superstructure section are in a first switching position, which allows hydraulic oil to flow from the additional valve block 15 via the hydraulic line 18 to the attachment 14.
[0041] After an oil leak has been detected by operating personnel or a sensor, the second emergency stop valves 24 in the boom assembly section of the hydraulic lines 18 are switched and closed by actuating the emergency stop device 25 and the 2-way valves 26 switch to a second switching position shown, in which hydraulic oil flows from the additional valve block 15 via the return line 27 into the hydraulic oil tank 16.
[0042] It is conceivable to use more than two emergency stop valves 23,24 per hydraulic line 18.
[0043] In both versions of the hydraulic systems, one electrically and one hydraulically pilot-controlled, oil leakage can be detected by operating personnel or a sensor. The emergency stop actuation device 25 can, for example, be designed as an actuation button in the driver's cab 5 or on the boom assembly 7, or it can be accessible via a control system of the mobile hydraulic construction machine 1, which has the necessary operating elements for controlling the mobile hydraulic construction machine 1. By actuating the emergency stop actuation device 25, the emergency stop valves 23, 24 are switched and the hydraulic oil flow is stopped. By actuating the emergency stop actuation device 25 again, the emergency stop valves 23, 24 can be switched back and the hydraulic lines 18 to the attachment 14 can be reopened. The emergency stop valves 23, 24 are switched back when the oil leak in the hydraulic lines 18 has been rectified.If the leak is detected by a sensor, it is conceivable that an alarm is triggered, whereupon the operating personnel can activate the emergency stop device 25. However, it is also possible for the emergency stop valves 23, 24 and / or the additional valve block 15 to be automatically controlled by the sensor that detects a pressure drop. In a further embodiment, it is provided to use emergency stop valves that close automatically when the pressure drops in the hydraulic line 18.
Claims
Claims: Mobile hydraulic working machine (1) comprising a superstructure (4), a substructure (2), a boom assembly (7) with a stick (10), an attachment (14) connected to the stick (10), and a hydraulic system for moving the boom assembly (7) and the attachment (14), wherein the hydraulic system comprises at least one hydraulic pump (17) and a valve block (15), wherein the valve block (15) is designed to regulate the oil flow of at least one hydraulic line (18) connecting the hydraulic consumer (14) to the hydraulic pump (17) for the purpose of controlling a hydraulic consumer (14), characterized in that at least one emergency stop valve (23, 24) is assigned to the at least one hydraulic line (18), which is designed to close the hydraulic line (18) in an emergency, wherein the at least one emergency stop valve (23, 24)24) in the area of the boom assembly (7) in the hydraulic line (18) and / or in the superstructure (4) on the flow side of the valve block (15) furthest from the pump. Mobile hydraulic working machine (1) according to claim 1, characterized in that the at least one hydraulic line (18) rests in a protected area on the upper side of the stick (10) or is formed by channels and that the respective emergency stop valve (24) is located in this protected area. Mobile hydraulic working machine (1) according to claim 1 or 2, characterized in that the at least one hydraulic line (18) is each attached at a first attachment point to the hydraulic consumer (14) and at a second attachment point to the boom assembly (10) and forms a flexible hose bend (21) between the two attachment points, wherein at least one emergency stop valve (24) is arranged in the area of the boom assembly (10) outside the flexible hose bend (21).
4. Mobile hydraulic working machine (1) according to one of the preceding claims, characterized in that the at least one emergency stop valve (23, 24) is an electronically controlled solenoid valve.
5. Mobile hydraulic working machine (1) according to claim 4, characterized in that the at least one emergency stop valve (23, 24) is a 2-way valve (26) and the hydraulic system comprises at least one return line (27) which connects the at least one emergency stop valve (26) to a hydraulic oil tank (16) from which the hydraulic system is supplied by means of the hydraulic pump (17).
6. Mobile hydraulic working machine (1) according to one of the preceding claims, characterized in that the mobile hydraulic working machine (1) comprises an emergency stop actuation device (25) which communicates with the at least one emergency stop valve (23, 24, 26) and / or the valve block (15) and is configured to close when the at least one emergency stop valve (23, 24, 26) is actuated.
7. Mobile hydraulic working machine (1) according to claim 6, characterized in that the emergency stop device (25) is arranged in a driver's cab (5) of the mobile hydraulic working machine (1).
8. Mobile hydraulic working machine (1) according to one of the preceding claims 1 to 5, characterized in that at least one sensor is assigned to the at least one hydraulic line (18) which is configured to detect a leakage in the at least one hydraulic line (18), wherein the at least one sensor communicates with the at least one emergency stop valve (23, 24, 26) and / or the valve block (15).
9. Mobile hydraulic working machine (1) according to one of the preceding claims, characterized in that the mobile hydraulic working machine (1) is a long-reach boom excavator having a reach height in a range of 15m to 40m.
10. Method for controlling a mobile hydraulic working machine (1) comprising a superstructure (4), a substructure (2), a boom assembly (7) with a stick (10), an attachment (14) connected to the stick (10), and a hydraulic system for moving the boom assembly (7) and the attachment (14), wherein the hydraulic system comprises at least one hydraulic pump (17) and a valve block (15), and at least one hydraulic line (18) connecting a hydraulic consumer (14) to the hydraulic pump (17), wherein the valve block (15) is connected to the at least one hydraulic line (18), characterized in that the method comprises the following successive steps: a. Detecting a leak in the hydraulic line (18) between the hydraulic consumer (14) and the valve block (15), b.Switching at least one emergency stop valve (23,24) which is arranged in the area of the boom assembly (7) and / or in the superstructure (4) on the flow side of the valve block (15) furthest from the pump in the at least one hydraulic line (18) and thereby shutting off the at least one hydraulic line (18).
11. Method according to claim 10, characterized in that at least one emergency stop valve is a 2-way valve (26) and the hydraulic system comprises at least one return line (27), and in step b. the emergency stop valve (26) connects the associated hydraulic line (18) to the return line (27), which is connected to a hydraulic oil tank (16) from which the hydraulic system is supplied by means of the hydraulic pump (17). The method according to claim 10, characterized in that the method comprises the following process step between steps a. and b.: - Actuating the valve block (15) and shutting off the at least one hydraulic line (18), wherein step b. is then carried out with a predetermined time delay. Method according to any one of the preceding claims 10 to 12, characterized in that in step a. detection is carried out by visual inspection by an operator or by a sensor arranged in the hydraulic line (18). Method according to any one of the preceding claims 10 to 13, characterized in that the mobile hydraulic construction machine (1) comprises an emergency stop actuation device (25) which communicates with the at least one emergency stop valve (23, 24, 26) and / or the valve block (15), wherein the method is as follows The process step following step a. includes: Manual activation of the emergency stop device (25) by an operator.