Hydraulic pipeline system and hydraulic excavator

Abstract

The utility model relates to the technical field of hydraulic excavators, and discloses a hydraulic pipeline system and a hydraulic excavator, the hydraulic pipeline system comprises a main pump, an oil suction piece, a hydraulic pump, a hydraulic pump and a hydraulic pump, the main oil tank is connected with an oil outlet pipe; the middle adjusting pipeline is connected between the oil suction piece and the oil outlet pipe, the middle adjusting pipeline comprises a middle connecting hard pipe and two flexible connecting pipe fittings connected to the two ends of the middle connecting hard pipe, and the two ends of the middle connecting hard pipe are installed on a frame of the hydraulic excavator through first position adjusting structures correspondingly; the installation position of the end of the middle connecting hard pipe on the frame can be adjusted in the direction perpendicular to the axis of the middle connecting hard pipe. The hydraulic pipeline system and the hydraulic excavator are provided with the middle adjusting pipeline, and the oil leakage risk can be effectively reduced.

Description

Technical Field

[0001] This application belongs to the field of hydraulic excavator technology, specifically relating to a hydraulic pipeline system and a hydraulic excavator. Background Technology

[0002] Extra-large tonnage excavators require a larger hydraulic flow rate, necessitating a larger suction pipe or auxiliary oil tank below the main pump to facilitate better oil intake. The hydraulic piping system between the main oil tank and the suction pipe or auxiliary oil tank is quite long. Significant dimensional errors during component manufacturing and assembly can lead to difficulties in assembling the hydraulic piping system, and in severe cases, even oil leaks at the pipe connections during use. Summary of the Invention

[0003] The purpose of this application is to provide a hydraulic pipeline system and a hydraulic excavator that can effectively reduce the risk of oil leakage.

[0004] To achieve the above objectives, a first aspect of this application provides a hydraulic piping system for use in a hydraulic excavator, the hydraulic piping system comprising:

[0005] The main pump has an oil suction component connected to its lower part.

[0006] The main fuel tank is connected to the fuel outlet pipe;

[0007] An intermediate adjustment pipeline is connected between the oil suction component and the oil outlet pipe. The intermediate adjustment pipeline includes an intermediate connecting rigid pipe and two flexible connecting pipes connected to the two ends of the intermediate connecting rigid pipe. The two ends of the intermediate connecting rigid pipe are respectively mounted on the frame of the hydraulic excavator through a first position adjustment structure so that the mounting position of the ends of the intermediate connecting rigid pipe on the frame can be adjusted in a direction perpendicular to the axis of the intermediate connecting rigid pipe.

[0008] In some specific embodiments, the first position adjustment structure includes an adjustment member, which has a plurality of position adjustment holes. The plurality of position adjustment holes include a plurality of strip holes extending in different directions or a plurality of dispersed holes in different orientations. The intermediate connecting rigid tube and the frame are respectively connected to the adjustment member through the strip holes or dispersed holes.

[0009] In some specific embodiments, the adjusting member is a bent plate and includes a first bent plate portion and a second bent plate portion. The first strip holes are arranged in pairs on the first bent plate portion, and the second strip holes are arranged in pairs on the second bent plate portion. The first bent plate portion has a first strip hole extending in a first direction, and the second bent plate portion has a second strip hole extending in a second direction. The end of the intermediate connecting rigid tube is connected to the adjusting member through one of the first strip hole and the second strip hole, and the adjusting member is connected to the frame through the other of the first strip hole and the second strip hole. The first direction and the second direction are perpendicular to each other and respectively perpendicular to the axis of the intermediate connecting rigid tube.

[0010] In some specific embodiments, the first position adjustment structure further includes a U-bolt, and the end of the intermediate connecting rigid tube is clamped in the U-bolt and connected to the adjusting member through the U-bolt.

[0011] In some specific embodiments, the end of the oil outlet pipe is mounted on the frame via a second position adjustment structure, so that the mounting position of the end of the oil outlet pipe on the frame can be adjusted.

[0012] In some specific embodiments, the flexible connecting pipe is a fabric-reinforced rubber hose.

[0013] In some specific embodiments, the end of the intermediate connecting rigid pipe is fixed to the flexible connecting pipe by a shoulder sealing structure and spring clamps provided on both sides of the shoulder sealing structure.

[0014] And / or, the flexible connecting pipe at one end of the intermediate connecting rigid pipe is connected to the oil suction component, and the flexible connecting pipe at the other end of the intermediate connecting rigid pipe is connected to the oil outlet pipe. The end of the oil suction component and the flexible connecting pipe, as well as the end of the oil outlet pipe and the flexible connecting pipe, are respectively fixed by a shoulder sealing structure and spring clamps provided on both sides of the shoulder sealing structure.

[0015] In some specific embodiments, the middle part of the flexible connecting pipe is fixed to the vehicle frame by a U-shaped plate assembly, and the inner plate surface of the U-shaped plate assembly is provided with a rubber layer.

[0016] In some specific embodiments, the length of the pipeline between the oil suction element and the oil outlet pipe is greater than the length of the pipeline of either the oil suction element or the oil outlet pipe.

[0017] In some specific embodiments, the hydraulic excavator is an excavator with a capacity of 100 tons or more;

[0018] And / or, the oil suction element is an oil suction rigid pipe or an auxiliary oil tank;

[0019] And / or, the oil outlet pipe is a rigid pipe and is equipped with a switching valve.

[0020] The second aspect of this application provides a hydraulic excavator with the aforementioned hydraulic piping system.

[0021] Through the above technical solution, since an intermediate adjustment pipeline is provided between the oil suction component and the oil outlet pipe, and flexible connecting pipes are provided at both ends of the intermediate connecting rigid pipe, the position of the intermediate connecting rigid pipe can be adjusted along the axial direction of the intermediate connecting rigid pipe. The two ends of the intermediate connecting rigid pipe are respectively mounted on the frame through the first position adjustment structure, so that the position of the intermediate connecting rigid pipe can be adjusted in a direction perpendicular to the axis of the intermediate connecting rigid pipe. Thus, the position of the intermediate connecting rigid pipe can be adjusted in different directions, effectively dealing with the installation dimension errors brought about during manufacturing and assembly. This not only greatly reduces the assembly difficulty and assembly stress of the hydraulic pipeline system, but also significantly improves the reliability of the hydraulic pipeline system and reduces the failure rate such as oil leakage.

[0022] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. Attached Figure Description

[0023] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the drawings:

[0024] Figure 1 A schematic diagram of the structure of a hydraulic pipeline system according to a specific embodiment of this application is shown;

[0025] Figure 2 It shows Figure 1 The main view of the adjustment component;

[0026] Figure 3 It shows Figure 1 Top view of the adjustment component;

[0027] Figure 4 It shows Figure 1 Side view of the adjustment component;

[0028] Figure 5 It shows Figure 1 A schematic diagram of the intermediate connecting rigid tube in the middle.

[0029] Description of Reference Numerals

[0030] 1. Main oil tank 2. Oil suction unit

[0031] 31 Intermediate connecting rigid pipe 311 Shoulder sealing structure

[0032] 32 Flexible connecting pipe fittings 33 Adjusting fittings

[0033] 331 First strip hole; 332 Second strip hole

[0034] 333 First bending plate section 334 Second bending plate section

[0035] 34 U-bolts 4 Oil outlet pipe

[0036] 5U-shaped plate assembly 6 Switch valve

[0037] 7-frame bend plate Detailed Implementation

[0038] The following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application.

[0039] For excavators with a tonnage of 100 tons or more, the hydraulic piping system between the main oil tank and the suction pipe below the main pump or the auxiliary oil tank is quite long. Due to significant dimensional errors in the manufacturing and assembly of components, and the fact that hydraulic piping typically uses continuous rigid pipe assemblies, the inherent limitations of these assemblies lead to a continuous increase in cumulative tolerances. This results in assembly difficulties or forced, strained assembly, ultimately causing oil leaks due to the excavator's high vibration levels, leading to a high rate of piping failures. Furthermore, the compact space within excavators makes disassembly during after-sales maintenance difficult.

[0040] In view of this, such as Figure 1 As shown, this application provides a hydraulic pipeline system, which includes a main pump, a main oil tank 1, and several intermediate adjusting pipelines. The main pump is connected to an oil suction component 2, the main oil tank 1 is connected to an oil outlet pipe 4, and the several intermediate adjusting pipelines are connected between the oil suction component 2 and the oil outlet pipe 4. The intermediate adjusting pipelines include an intermediate connecting rigid pipe 31 and two flexible connecting pipes 32 connected to the two ends of the intermediate connecting rigid pipe 31. The two ends of the intermediate connecting rigid pipe 31 are respectively mounted on the frame of a hydraulic excavator through a first position adjustment structure, so that the mounting position of the end of the intermediate connecting rigid pipe 31 on the frame can be adjusted in a direction perpendicular to the axis of the intermediate connecting rigid pipe 31.

[0041] Specifically, such as Figure 1As shown, the hydraulic piping system includes an intermediate adjusting pipe. The intermediate connecting rigid pipe 31 is a straight rigid pipe, and each end of the intermediate connecting rigid pipe 31 along the axial direction is connected to a flexible connecting pipe 32. The flexible connecting pipe 32 located at one axial end of the intermediate connecting rigid pipe 31 is connected to the oil suction component 2, and the flexible connecting pipe 32 located at the other axial end of the intermediate connecting rigid pipe 31 is connected to the oil outlet pipe 4. In this way, by setting flexible connecting pipes 32 at both axial ends of the intermediate connecting rigid pipe 31, the intermediate connecting rigid pipe 31 can be adjusted back and forth along the axial direction. Furthermore, the two axial ends of the intermediate connecting rigid pipe 31 are respectively mounted on the frame through a first position adjusting structure. The first position adjusting structure allows the ends of the intermediate connecting rigid pipe 31 to be adjusted in a direction perpendicular to the axis of the intermediate connecting rigid pipe 31, that is, the ends of the intermediate connecting rigid pipe 31 can be adjusted in the up, down, left, and right directions. In this way, the intermediate connecting rigid pipe 31 can be adjusted in a wide range of directions, effectively addressing installation dimensional errors caused during manufacturing and assembly, and completely solving the problem of "stiff" assembly. This not only greatly reduces the assembly difficulty and stress of the hydraulic pipeline system, but also significantly improves the reliability of the hydraulic pipeline system and reduces the failure rate such as oil leakage. At the same time, due to the multi-segmentation of the pipeline, the assembly difficulty of each segment is reduced, resulting in a significant improvement in overall assembly efficiency.

[0042] It should be noted that the hydraulic piping system may include not only one intermediate adjusting pipe, but also two or more intermediate adjusting pipes, such as three, four, or five. The flexible connecting pipe 32 may be a fabric-reinforced hose, a rigid pipe connector, or other flexible connecting components; the oil outlet pipe 4 is typically a rigid pipe, which may be a straight pipe, a bend, or a combination of pipes; the oil suction component 2 may be a lower oil suction rigid pipe of the main pump or an auxiliary oil tank. The specific structure of the first position adjusting structure can vary. For example, the first position adjusting structure may include multiple position adjusting holes provided on the frame, and the intermediate connecting rigid pipe 31 may be selectively fixed to the position adjusting holes at the desired positions using fasteners; alternatively, the first position adjusting structure may also include an adjusting component with multiple position adjusting holes, through which the intermediate connecting rigid pipe 31 is mounted on the frame; the multiple position adjusting holes may include multiple dispersed holes at different directional positions, or multiple strip-shaped holes extending in different directions, etc. These structural forms should also fall within the scope of protection of this application.

[0043] Furthermore, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the first position adjustment structure may include an adjustment member 33, which has a first strip-shaped hole 331 extending in a first direction and a second strip-shaped hole 332 extending in a second direction. The end of the intermediate connecting rigid tube 31 is connected to the adjustment member 33 through one of the first strip-shaped hole 331 and the second strip-shaped hole 332, and the adjustment member 33 is connected to the vehicle frame through the other of the first strip-shaped hole 331 and the second strip-shaped hole 332. The first direction and the second direction are perpendicular to each other and respectively perpendicular to the axis of the intermediate connecting rigid tube 31.

[0044] Furthermore, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the adjusting member 33 can be a bent plate and includes a first bent plate portion 333 and a second bent plate portion 334. A pair of first strip holes 331 are provided on the first bent plate portion 333, and a pair of second strip holes 332 are provided on the second bent plate portion 334.

[0045] In some specific embodiments, the first position adjustment structure may further include a U-bolt 34, with the end of the intermediate connecting rigid tube 31 clamped in the U-bolt 34 and connected to the first strip hole 331 or the second strip hole 332 of the adjusting member 33 through the U-bolt 34.

[0046] Optionally, such as Figure 1 As shown, the hydraulic piping system may also include a frame bend 7 mounted on the frame, and the adjusting member 33 is connected to the frame via the frame bend 7.

[0047] In some specific embodiments, the end of the oil outlet pipe 4 is mounted on the frame via a second position adjustment structure, allowing adjustment of the installation position of the end of the oil outlet pipe 4 on the frame. This second position adjustment structure enables the end of the oil outlet pipe 4 to be adjusted in a direction perpendicular to the axis of the intermediate connecting rigid pipe 31, i.e., the end of the oil outlet pipe 4 can be adjusted vertically and horizontally. Thus, the end of the oil outlet pipe 4 can be adjusted in different directions, effectively addressing installation dimensional errors introduced during manufacturing and assembly. This not only further reduces the assembly difficulty and stress of the hydraulic piping system but also significantly improves the reliability of the hydraulic piping system and reduces the failure rate, such as oil leaks.

[0048] The structure of the second position adjustment structure can vary. For example, the second position adjustment structure may include multiple position adjustment holes provided on the frame, and the end of the oil outlet pipe 4 may be selectively fixed to the position adjustment hole at the desired position by fasteners; or, the second position adjustment structure may also include an adjustment component with multiple position adjustment holes, and the end of the oil outlet pipe 4 may be provided on the frame by the component, etc.; the multiple position adjustment holes may include multiple dispersed holes at different directional positions, or multiple strip holes extending in different directions, etc., and these structural forms should also fall within the protection scope of this application.

[0049] In some specific implementations, such as Figure 1 and Figure 5 As shown, the flexible connecting pipe 32 can be a fabric-reinforced rubber hose. The end of the intermediate connecting rigid pipe 31 is fixed to the flexible connecting pipe 32 by a shoulder sealing structure and spring clamps provided on both sides of the shoulder sealing structure.

[0050] In some specific implementations, such as Figure 1 and Figure 5 As shown, the flexible connecting pipe 32 located at one axial end of the intermediate connecting rigid pipe 31 is connected to the oil suction component, and the flexible connecting pipe 32 located at the other axial end of the intermediate connecting rigid pipe 31 is connected to the oil outlet pipe 4. The end of the oil suction component 2 and the flexible connecting pipe 32, as well as the end of the oil outlet pipe 4 and the flexible connecting pipe 32, are respectively fixed by a shoulder sealing structure 311 and spring clamps provided on both sides of the shoulder sealing structure 311.

[0051] In this way, by setting a shoulder sealing structure 311 at the end of the intermediate connecting hard pipe 31, the end of the oil outlet pipe 4 and the end of the oil suction component 2, the sealing effect of the connection part can be guaranteed, making the structure of the hydraulic pipeline system more stable and reliable.

[0052] In some specific implementations, such as Figure 1 As shown, when the length of the flexible connecting pipe 32 is too long, the middle part of the flexible connecting pipe 32 can be fixed to the frame by the U-shaped plate assembly 5, so as to support the flexible connecting pipe 32 and prevent the flexible connecting pipe 32 from falling after oil is introduced.

[0053] Optionally, the inner surface of the U-shaped plate assembly 5 is provided with a rubber layer to protect the flexible connecting pipe 32.

[0054] In some specific implementations, such as Figure 1As shown, the length of the pipeline between the oil suction component 2 and the oil outlet pipe 4 is greater than the length of the pipeline between the oil suction component 2 and the oil outlet pipe 4. That is, when the distance between the main oil tank 1 and the main pump is constant, by setting an intermediate adjusting pipeline with flexible position adjustment, the length of the oil suction component 2 and / or the oil outlet pipe 4 can be shortened, thereby greatly reducing the assembly dimensional error of the end positions of the oil suction component 2 and the oil outlet pipe 4. Furthermore, the length of the intermediate connecting rigid pipe 31 is greater than the length of the pipeline between the oil suction component 2 and the oil outlet pipe 4. Even further, the length of the pipeline between the oil suction component 2 and the oil outlet pipe 4 is twice or more the length of the pipeline between the oil suction component 2 and the oil outlet pipe 4.

[0055] In some specific implementations, such as Figure 1 As shown, the oil outlet pipe 4 can be a rigid pipe and equipped with a switching valve 6. This allows the main oil tank and auxiliary oil tank to be disconnected during maintenance or transportation, preventing oil waste and environmental pollution from leaks. The switching valve 6 can be a butterfly valve, ball valve, etc. A detection sensor can be installed on the switching valve 6 to detect its opening and closing status. When the switching valve 6 is detected as open, it sends an open signal; conversely, when it is detected as closed, it sends a closed signal. The detection sensor is connected to the controller, which can acquire the open and closed signals from the sensor in real time. When the hydraulic excavator is operating and receives a closed signal from the sensor, the controller stops the main pump unit or issues an alarm signal. This allows for real-time identification of whether the switching valve 6 is open during normal excavator operation, ensuring the excavator's operational reliability.

[0056] The second aspect of this application also provides a hydraulic excavator that includes the aforementioned hydraulic piping system. Since this hydraulic excavator includes the aforementioned hydraulic piping system, it also possesses all the technical effects brought about by that hydraulic piping system, and therefore will not be repeated here.

[0057] Optionally, the hydraulic excavator may be an excavator with a capacity of 100 tons or more.

[0058] It should be noted that the structures of components such as the main pump, main oil tank, auxiliary oil tank, and switching valve are well known to those skilled in the art and are not part of the core improvements of this application, so they will not be described in detail here.

[0059] In summary, the hydraulic pipeline system and hydraulic excavator of this application are equipped with an intermediate adjustment pipeline. The two ends of the intermediate connecting rigid pipe of the intermediate adjustment pipeline are respectively provided with flexible connecting pipes, so that the position of the intermediate connecting rigid pipe can be adjusted along the axial direction of the intermediate connecting rigid pipe. The two ends of the intermediate connecting rigid pipe are respectively mounted on the frame through a first position adjustment structure, so that the position of the intermediate connecting rigid pipe can be adjusted in a direction perpendicular to the axis of the intermediate connecting rigid pipe. This allows the intermediate connecting rigid pipe to be adjusted in different directions, effectively addressing the installation dimension errors caused during manufacturing and assembly. This not only greatly reduces the assembly difficulty and assembly stress of the hydraulic pipeline system, but also significantly improves the reliability of the hydraulic pipeline system and reduces the failure rate such as oil leakage.

[0060] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A hydraulic pipeline system, characterized in that, include: Main pump, which is connected to an oil suction component (2); The main oil tank (1) is connected to an oil outlet pipe (4); A plurality of intermediate adjustment pipes are connected between the oil suction component (2) and the oil outlet pipe (4). The intermediate adjustment pipes include an intermediate connecting rigid pipe (31) and two flexible connecting pipes (32) connected to the two ends of the intermediate connecting rigid pipe (31). The two ends of the intermediate connecting rigid pipe (31) are respectively mounted on the frame of the hydraulic excavator through a first position adjustment structure so that the mounting position of the end of the intermediate connecting rigid pipe (31) on the frame can be adjusted in a direction perpendicular to the axis of the intermediate connecting rigid pipe (31).

2. The hydraulic pipeline system according to claim 1, characterized in that, The first position adjustment structure includes an adjustment member (33), which is provided with a plurality of position adjustment holes. The plurality of position adjustment holes include a plurality of strip holes extending in different directions or a plurality of dispersed holes in different positions. The intermediate connecting rigid tube (31) and the frame are respectively connected to the adjustment member through the strip holes or dispersed holes.

3. The hydraulic pipeline system according to claim 2, characterized in that, The adjusting member (33) is a bent plate and includes a first bent plate portion (333) and a second bent plate portion (334). The first bent plate portion (333) is provided with a first strip hole (331) extending in a first direction, and the second bent plate portion (334) is provided with a second strip hole (332) extending in a second direction. The end of the intermediate connecting tube (31) is connected to the adjusting member (33) through one of the first strip hole (331) and the second strip hole (332). The adjusting member (33) is connected to the frame through the other of the first strip hole (331) and the second strip hole (332). The first direction and the second direction are perpendicular to each other and respectively perpendicular to the axis of the intermediate connecting tube (31).

4. The hydraulic pipeline system according to claim 2, characterized in that, The first position adjustment structure also includes a U-bolt (34), the end of the intermediate connecting rigid tube (31) is clamped in the U-bolt (34) and connected to the adjusting member (33) through the U-bolt (34).

5. The hydraulic pipeline system according to claim 1, characterized in that, The end of the oil outlet pipe (4) is mounted on the frame via a second position adjustment structure so that the mounting position of the end of the oil outlet pipe (4) on the frame can be adjusted.

6. The hydraulic pipeline system according to claim 1, characterized in that, The flexible connecting pipe (32) is a fabric-reinforced rubber hose.

7. The hydraulic pipeline system according to claim 6, characterized in that, The end of the intermediate connecting rigid pipe (31) is fixed to the flexible connecting pipe (32) by a shoulder sealing structure and spring clamps provided on both sides of the shoulder sealing structure; And / or, the flexible connecting pipe (32) located at one end of the intermediate connecting rigid pipe (31) is connected to the oil suction component, and the flexible connecting pipe (32) located at the other end of the intermediate connecting rigid pipe (31) is connected to the oil outlet pipe (4). The end of the oil suction component and the flexible connecting pipe (32) are respectively fixed by a shoulder sealing structure (311) and spring clamps provided on both sides of the shoulder sealing structure (311).

8. The hydraulic pipeline system according to claim 6, characterized in that, The middle part of the flexible connecting pipe (32) is fixed to the frame by a U-shaped plate assembly (5), and the inner plate surface of the U-shaped plate assembly (5) is provided with a rubber layer.

9. The hydraulic pipeline system according to claim 1, characterized in that, The length of the pipeline between the oil suction component (2) and the oil outlet pipe (4) is greater than the length of the pipeline between the oil suction component (2) or the oil outlet pipe (4); And / or, the oil suction element (2) is an oil suction hard pipe or a secondary oil tank; And / or, the oil outlet pipe (4) is a rigid pipe and is equipped with a switch valve (6).

10. A hydraulic excavator, characterized in that, The hydraulic excavator includes a hydraulic pipeline system according to any one of claims 1 to 8, wherein the hydraulic excavator is an excavator with a capacity of 100 tons or more.

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