Oil-water separator fixing structure of mobile pump station

Abstract

The utility model discloses an oil-water separator fixing structure of a mobile pump station. The oil-water separator fixing structure comprises a chassis; the pump mechanism is arranged on the chassis; the hydraulic system comprises a hydraulic oil tank which is located at the edge position of the chassis; the power mechanism comprises an engine, a fuel tank, a first-stage oil-water separator and a second-stage oil-water separator, the engine is located in the middle of the chassis, a first output shaft of the engine is in transmission connection with an input shaft of the pump mechanism, the fuel tank is located on the chassis and connected with the first-stage oil-water separator, the first-stage oil-water separator is connected with the second-stage oil-water separator, and the second-stage oil-water separator is connected with the second- the first-stage oil-water separator is assembled on a hydraulic oil tank through a support, the second-stage oil-water separator is connected with an engine, the second-stage oil-water separator is connected with a fuel tank through an oil return pipe, and the second-stage oil-water separator is assembled on the engine and located on the side of the engine; the first-stage oil-water separator and the second-stage oil-water separator are located on the same side of the engine, and unified maintenance is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of mobile pumping stations, and in particular to a fixed structure for an oil-water separator in a mobile pumping station. Background Technology

[0002] In scenarios such as agricultural irrigation and drainage, and urban flood control and drainage, small mobile pumping stations have become key equipment for drainage operations in narrow spaces (such as underground garages and subway stations) due to their flexibility and adaptability.

[0003] As a key component of the fuel system, the oil-water separator is mainly used to remove water and impurities from the fuel. Its working principle utilizes the density difference between oil and water, achieving oil-water separation through gravity settling, centrifugal separation, or filtration adsorption, thereby protecting the engine from damage and ensuring the normal operation of the fuel system. In existing mobile pump stations, the engine is usually mounted in the middle of the chassis, and the oil-water separator is typically concentrated near the engine, located in the middle of the chassis or on the engine. This arrangement results in limited maintenance space and makes operation during maintenance very inconvenient. Utility Model Content

[0004] Therefore, it is necessary to provide a fixed structure for the oil-water separator of a mobile pump station to solve the problem that the existing mobile pump station's oil-water separator has an unreasonable installation location and is very inconvenient to operate during maintenance.

[0005] To achieve the above objectives, the inventors provide a fixed structure for an oil-water separator in a mobile pumping station, comprising:

[0006] Chassis;

[0007] A pump mechanism, mounted on the chassis, is used for pumping water;

[0008] A hydraulic system, including a hydraulic tank located at the edge of the chassis; and

[0009] The power unit includes an engine, a fuel tank, a primary oil-water separator, and a secondary oil-water separator. The engine is located on the chassis, and its first output shaft is drivenly connected to the input shaft of the pump mechanism. The fuel tank is located on the chassis, and its outlet is connected to the inlet of the primary oil-water separator. The outlet of the primary oil-water separator is connected to the inlet of the secondary oil-water separator. The primary oil-water separator is mounted on the hydraulic oil tank via a bracket. The first outlet of the secondary oil-water separator is connected to the inlet of the engine, and its return port is connected to the return port of the engine. The second outlet of the secondary oil-water separator is connected to the return port of the fuel tank via a return pipe. The secondary oil-water separator is mounted on the engine and located to the side of the engine.

[0010] Furthermore: the bracket has an L-shaped first plate and a second plate;

[0011] The first plate is threadedly connected to the hydraulic oil tank, and the first-stage oil-water separator has a first connecting part;

[0012] The first connecting part is L-shaped, and one end of the first connecting part is attached to the second plate and threadedly connected. The first-stage oil-water separator is located on the side of the hydraulic oil tank.

[0013] Furthermore: the top of the hydraulic oil tank has a first screw hole, and one end of the first plate has a first through hole. The depth of the first screw hole and the first through hole are both in the vertical direction. The first bolt passes through the first through hole and is screwed into the first screw hole to achieve threaded connection.

[0014] The other end of the first plate has a second through hole, which is located above the first through hole. One end of the first connecting part has a third through hole. The depths of the second through hole and the third through hole are both horizontal. The second bolt passes through the second through hole and the third through hole and is connected by a nut to achieve a threaded connection.

[0015] The primary oil-water separator is located on the rear side of the hydraulic oil tank.

[0016] Furthermore, it also includes an oil pump, which is integrated into the primary oil-water separator and located between the inlet of the primary oil-water separator and the filter cartridge, for drawing fuel from the fuel tank into the primary oil-water separator.

[0017] Furthermore, the oil pump is a manually operated pump located above the primary oil-water separator.

[0018] Furthermore, it also includes an outer cover, which is hinged to the chassis, and covers the hydraulic system and the power mechanism. The outer cover has an inspection port on the side of the primary oil-water separator, and the inspection port is provided with an openable and closable cover.

[0019] Furthermore: the hydraulic system also includes a hydraulic cylinder and a hydraulic pump, the hydraulic cylinder is located inside the outer cover, one end of the hydraulic cylinder is hinged to the chassis, and the other end of the hydraulic cylinder is hinged to the outer cover;

[0020] The input shaft of the hydraulic oil pump is connected to the second output shaft of the engine. The oil inlet of the hydraulic oil pump is connected to the hydraulic oil tank, and the oil outlet is connected to the working oil port of the oil cylinder through a reversing valve.

[0021] Furthermore, it also includes a gas spring, the cover is hinged to the access port, one end of the gas spring is hinged to the outer cover, and the other end of the gas spring is hinged to the cover.

[0022] Furthermore: the projections of both the primary oil-water separator and the secondary oil-water separator are located within the projection of the inspection port, and the projection direction is parallel to the width direction of the chassis; or:

[0023] The primary oil-water separator and the secondary oil-water separator are located on the same side of the engine.

[0024] Furthermore: the chassis includes a frame and a running gear;

[0025] The frame supports the pump mechanism, the hydraulic system and the power mechanism. The fuel tank is integrated inside the frame. The fuel tank's outlet and return port are located on the top of the frame. A fuel injection pipe also protrudes from the top of the frame and connects to the fuel tank.

[0026] The walking mechanism is located below the vehicle frame and is used to drive the vehicle frame to move.

[0027] The walking mechanism includes two walking tracks arranged side by side, and the hydraulic oil tank and the primary oil-water separator are located above the walking tracks.

[0028] Unlike existing technologies, the above technical solution has the following advantages:

[0029] Because the hydraulic oil tank is located at the edge of the chassis, and the primary oil-water separator is mounted on it via a bracket, also close to the edge of the chassis, maintenance and inspection are convenient for repair personnel. The secondary oil-water separator is installed on the side of the engine. The primary and secondary oil-water separators are grouped together for easy, unified maintenance. This optimized design of the primary and secondary oil-water separator locations significantly improves the ease of maintenance and space utilization of the mobile pump station.

[0030] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0031] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this utility model and other related contents, and should not be considered as limitations on this application.

[0032] Figure 1 This is one of the perspective views of the fixed structure of the oil-water separator of the mobile pump station in this embodiment;

[0033] Figure 2 This is the second perspective view of the fixed structure of the oil-water separator of the mobile pump station in this embodiment;

[0034] Figure 3 for Figure 2 A 3D view of an oil-water separator;

[0035] Figure 4 This is a perspective view of the oil-water separator in this embodiment;

[0036] Figure 5 This is a perspective view of the hydraulic oil tank and bracket in this embodiment;

[0037] Figure 6 This is a side view of the fixed structure of the oil-water separator of the mobile pump station in this embodiment.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Chassis; 11. Frame; 12. Tracks;

[0040] 2. Pump mechanism;

[0041] 3. Hydraulic system; 31. Hydraulic oil tank; 32. Oil cylinder; 33. Hydraulic oil pump;

[0042] 4. Power mechanism;

[0043] 41. Engine;

[0044] 42. Fuel tank; 421. Fuel suction pipe; 422. First connecting pipe; 423. Second connecting pipe; 424. Third connecting pipe; 425. Fuel return pipe;

[0045] 43. First-stage oil-water separator; 431. First connecting part; 432. Oil pump;

[0046] 44. Secondary oil-water separator; 441. Second connection part;

[0047] 45. Bracket; 451. First plate; 452. Second plate; 453. First bolt; 454. Second bolt; 455. Nut;

[0048] 5. Outer cover; 51. Inspection port; 52. Cover; 53. Hinge; 54. Lock. Detailed Implementation

[0049] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0050] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0051] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0052] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0053] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0054] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0055] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0056] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0057] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0058] Please see Figures 1 to 6 This embodiment provides a fixed structure for an oil-water separator in a mobile pumping station, comprising:

[0059] Chassis 1;

[0060] Pump mechanism 2, mounted on chassis 1, is used for pumping water;

[0061] Hydraulic system 3 includes hydraulic oil tank 31, which is located at the edge of chassis 1; and

[0062] The power unit 4 includes an engine 41, a fuel tank 42, a primary oil-water separator 43, and a secondary oil-water separator 44. The engine 41 is located in the middle of the chassis 1. The first output shaft of the engine 41 is connected to the input shaft of the pump mechanism 2. The fuel tank 42 is located on the chassis 1. The outlet of the fuel tank 42 is connected to the inlet of the primary oil-water separator 43, and the outlet of the primary oil-water separator 43 is connected to the inlet of the secondary oil-water separator 44. The primary oil-water separator 43 is mounted on the hydraulic oil tank 31 via a bracket 45. The first outlet of the secondary oil-water separator 44 is connected to the inlet of the engine 41, and the return port of the secondary oil-water separator 44 is connected to the return port of the engine 41. The second outlet of the secondary oil-water separator 44 is connected to the return port of the fuel tank 42 via a return pipe 425. The secondary oil-water separator 44 is mounted on the engine 41 and located on the side of the engine 41. The primary oil-water separator 43 and the secondary oil-water separator 44 are located on the same side of the engine 41.

[0063] The main function of the fuel-water separator is to remove water and impurities from the fuel, protecting the engine 41 from damage and ensuring its normal operation. Fuel exiting the fuel tank 42 first undergoes preliminary fuel-water separation treatment via the primary fuel-water separator 43. Fuel processed by the secondary fuel-water separator 44 is then supplied to the engine 41 through the first outlet. Simultaneously, excess fuel returns to the fuel tank 42 through the return port and return pipe 425 of the secondary fuel-water separator 44.

[0064] Because the hydraulic oil tank 31 is located at the edge of the chassis 1, and the primary oil-water separator 43 is mounted on it via a bracket 45, also close to the edge of the chassis 1, it facilitates maintenance and inspection by maintenance personnel. The secondary oil-water separator 44 is installed on the side of the engine 41. The primary oil-water separator 43 and the secondary oil-water separator 44 are concentrated together, facilitating unified maintenance. This technical solution, through the optimized design of the positions of the primary oil-water separator 43 and the secondary oil-water separator 44, significantly improves the maintenance convenience and space utilization of the mobile pump station.

[0065] Please see Figure 3 , Figure 4 and Figure 5 In this embodiment, the bracket 45 has an L-shaped first plate 451 and a second plate 452, which are integrally formed. The first plate 451 is threadedly connected to the hydraulic oil tank 31. The primary oil-water separator 43 has a first connecting part 431, which is L-shaped. One end of the first connecting part 431 fits against and is threadedly connected to the second plate 452. The primary oil-water separator 43 is located to the side of the hydraulic oil tank 31, allowing for convenient access for maintenance. The threaded connection not only ensures the stability of the structure but also facilitates disassembly and assembly operations during position adjustment or maintenance.

[0066] Please see Figure 3 and Figure 5 In this embodiment, the top of the hydraulic oil tank 31 has a first screw hole, and one end of the first plate 451 has a first through hole. The depths of both the first screw hole and the first through hole are vertical. A first bolt 453 passes through the first through hole and is screwed into the first screw hole to achieve a threaded connection, fixing the first plate 451 to the top of the hydraulic oil tank 31. The other end of the first plate 451 has a second through hole, which is located above the first through hole. One end of the first connecting part 431 has a third through hole. The depths of both the second and third through holes are horizontal. A second bolt 453 is screwed into the first screw hole to achieve a threaded connection, fixing the first plate 451 to the top of the hydraulic oil tank 31. 54 passes through the second and third through holes and is threaded together with nut 455 to fix the second plate 452 and the first connecting part 431 together; the top of the hydraulic oil tank 31 is horizontal, the first plate 451 is horizontal, the second plate 452 is vertical, the first connecting part 431 is also L-shaped, the first-stage oil-water separator 43 is placed vertically, the hydraulic oil tank 31 is located to the side of the engine 41, and the first-stage oil-water separator 43 is located to the rear side of the hydraulic oil tank 31, so that the positions of the first-stage oil-water separator 43 and the second-stage oil-water separator 44 are relatively concentrated. In some embodiments, the bracket 45 can be other shapes, such as a straight line, and the connection between the bracket 45 and the hydraulic oil tank 31 and the first connecting part 431 can be a snap-fit ​​connection.

[0067] Please see Figure 3 In this embodiment, the housing of the first connecting part 431 and the first-stage oil-water separator 43 are integrally formed, which enhances the rigidity and durability of the overall structure. The integral form can be manufactured in one piece by casting, injection molding or other suitable material processing methods.

[0068] Please see Figure 3 In this embodiment, the secondary oil-water separator 44 has a second connecting part 441, which is L-shaped and threadedly connected to the engine 41. Specifically, the vertical part of the second connecting part 441 has a fourth through hole, and the side wall of the engine 41 has a second threaded hole. A third bolt passes through the fourth through hole and is screwed into the second threaded hole to fix the second connecting part 441 and the engine 41 together.

[0069] Please see Figure 3 and Figure 4 In this embodiment, the oil-water separator fixing structure also includes an oil pump 432, which is integrated into the primary oil-water separator 43 and located between the inlet of the primary oil-water separator 43 and the filter cartridge. The oil pump 432 is used to draw fuel from the fuel tank 42 into the primary oil-water separator 43. When the engine 41 is started for the first time or has not been used for a long time, the engine 41 may be unable to draw fuel on its own due to air in the fuel system or other reasons. In this case, the oil pump 432 can provide the necessary pressure to draw fuel from the fuel tank 42.

[0070] Please see Figure 3 and Figure 4 In this embodiment, the fuel tank 42 outlet is connected to the inlet of the primary oil-water separator 43 via a suction pipe 421, the primary oil-water separator 43 outlet is connected to the inlet of the secondary oil-water separator 44 via a first connecting pipe 422, the secondary oil-water separator 44 first outlet is connected to the engine 41 fuel inlet via a second connecting pipe 423, the secondary oil-water separator 44 return port is connected to the engine 41 return port via a third connecting pipe 424, and the secondary oil-water separator 44 second outlet is connected to the fuel tank 42 return port via a return pipe 425.

[0071] Please see Figure 3 and Figure 4 In this embodiment, the fuel pump 432 is a manually operated pump located at the top of the primary fuel-water separator 43. When it is necessary to start the engine 41 or purge air from the fuel system, the operator manually presses the fuel pump 432. Each press creates a pressure difference within the pump body, sufficient to draw fuel from the fuel tank 42. In some embodiments, the fuel pump 432 is electrically driven, providing a continuous and stable fuel supply. In this case, the electrically driven fuel pump 432 can be electrically connected to the control cabinet of a mobile pumping station, allowing remote control to operate the pump and draw fuel.

[0072] Please see Figure 1 , Figure 2 and Figure 6 In this embodiment, the oil-water separator fixing structure also includes an outer cover 5, which is hinged to the chassis 1. The outer cover 5 covers the hydraulic system 3 and the power mechanism 4. The outer cover 5 has an inspection port 51 on the side of the primary oil-water separator 43, and the inspection port 51 is provided with an openable and closable cover 52. Specifically, the outer cover 5 is connected to the chassis 1 by a hinge 53, and can be rotated around the hinge 53 to open or close. Figure 1 This indicates that the outer cover 5 is in the open state. Figure 2 and Figure 6 The outer cover 5 is shown in the closed state. The outer cover 5 rests against the upper edge of the chassis 1, covering the hydraulic system 3 and power mechanism 4, providing protection and preventing mud and sand from splashing onto them during operation. An openable and closable cover 52 is installed at the inspection port 51, allowing operators to open or close the cover 52 as needed for maintenance of the primary oil-water separator 43 and the secondary oil-water separator 44.

[0073] Please see Figure 1 and Figure 6In this embodiment, the hydraulic system 3 also includes a cylinder 32 and a hydraulic pump 33. The cylinder 32 is located inside the outer cover 5, with one end hinged to the chassis 1 and the other end hinged to the outer cover 5. The input shaft of the hydraulic pump 33 is connected to the second output shaft of the engine 41. The inlet of the hydraulic pump 33 is connected to the hydraulic oil tank 31, and the outlet of the hydraulic pump 33 is connected to the working port of the cylinder 32 through a reversing valve (an electro-proportional reversing valve may be selected). Specifically, the outlet of the hydraulic pump 33 is connected to the working port of the cylinder 32 through a reversing valve. The working port is divided into a rod chamber port and a rodless chamber port. The hydraulic oil tank 31, the hydraulic pump 33, the reversing valve, and the cylinder 32 are connected by hydraulic pipes to form a hydraulic circuit. When hydraulic oil enters from the rodless chamber port and exits from the rod chamber port, the cylinder 32 extends, thereby causing the outer cover 5 to rotate around the hinge point with the chassis 1, and the outer cover 5 opens. Conversely, hydraulic oil enters from the rod chamber port and exits from the rodless chamber port, causing cylinder 32 to shorten and outer cover 5 to close.

[0074] Please see Figure 1 In a preferred embodiment, there are two hydraulic cylinders 32, which are arranged on the left and right sides to drive the outer cover 5 to flip.

[0075] In this embodiment, the hydraulic system 3 can provide hydraulic power to other hydraulic actuators of the mobile pump station, such as the hydraulic tracked chassis 1.

[0076] In this embodiment, the oil-water separator fixing structure also includes a gas spring. The cover 52 is hinged to the inspection port 51, one end of the gas spring is hinged to the outer cover 5, and the other end of the gas spring is hinged to the cover 52. After the cover 52 is opened, the gas spring can stably support the cover 52 at any angle, preventing it from falling back automatically and ensuring the safety and convenience of operators when performing maintenance work.

[0077] In this embodiment, the projections of both the primary oil-water separator 43 and the secondary oil-water separator 44 are located within the projection of the access port 51, with the projection direction parallel to the width direction of the chassis 1. When viewed from the width direction of the chassis 1 (i.e., perpendicular to the direction of equipment movement), both the primary oil-water separator 43 and the secondary oil-water separator 44 are completely contained within the range of the access port 51. Operators can complete all necessary maintenance tasks in a centralized area, reducing the time spent on movement and adjustments. Of course, in some embodiments, the projections of the primary oil-water separator 43 and the secondary oil-water separator 44 may be partially located within the projection of the access port 51, with the projection direction parallel to the width direction of the chassis 1.

[0078] Please see Figure 1 and Figure 2 In this embodiment, the cover 52 is provided with a latch 54, which is used to lock the cover 52 onto the access port 51.

[0079] Please see Figure 1 , Figure 2 and Figure 6 In this embodiment, the chassis 1 includes a frame 11 and a running gear. The frame 11 supports the pump mechanism 2, the hydraulic system 3, and the power mechanism 4. A fuel tank 42 is integrated inside the frame 11. The fuel tank 42's outlet and return port are located at the top of the frame 11. A fuel filler pipe also protrudes from the top of the frame 11, connecting to the fuel tank 42. Specifically, the frame 11 has an internal cavity that serves as the fuel tank 42, making the entire system more compact. When refueling is needed, the operator can directly refuel through the fuel filler pipe at the top of the frame 11, making the operation simple and efficient. The fuel tank 42's outlet and return port are located at the top of the frame 11, facilitating connection to the primary oil-water separator 43 and the secondary oil-water separator 44.

[0080] Please see Figure 1 , Figure 2 and Figure 6 In this embodiment, the traveling mechanism is located below the chassis 11 and is used to drive the chassis 11 to move. The traveling mechanism includes two side-by-side tracks 12, with a hydraulic oil tank 31 and a primary oil-water separator 43 located above the tracks 12. Specifically, the tracks 12 are hydraulically driven, with power derived from the hydraulic system 3. The tracks 12 provide excellent traction and passability, making them particularly suitable for operations in complex terrain or harsh environments. Placing the hydraulic oil tank 31 and the primary oil-water separator 43 above the tracks 12 makes full use of the space layout of the chassis 1, resulting in a more compact and efficient system.

[0081] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A fixed structure for an oil-water separator in a mobile pumping station, characterized in that, include: Chassis; A pump mechanism, mounted on the chassis, is used for pumping water; A hydraulic system, including a hydraulic tank located at the edge of the chassis; as well as The power unit includes an engine, a fuel tank, a primary oil-water separator, and a secondary oil-water separator. The engine is located on the chassis, and its first output shaft is drivenly connected to the input shaft of the pump mechanism. The fuel tank is located on the chassis, and its outlet is connected to the inlet of the primary oil-water separator. The outlet of the primary oil-water separator is connected to the inlet of the secondary oil-water separator. The primary oil-water separator is mounted on the hydraulic oil tank via a bracket. The first outlet of the secondary oil-water separator is connected to the inlet of the engine, and its return port is connected to the return port of the engine. The second outlet of the secondary oil-water separator is connected to the return port of the fuel tank via a return pipe. The secondary oil-water separator is mounted on the engine and located to the side of the engine.

2. The structure according to claim 1, characterized in that: The bracket has an L-shaped first plate and a second plate; The first plate is threadedly connected to the hydraulic oil tank, and the first-stage oil-water separator has a first connecting part; The first connecting part is L-shaped, and one end of the first connecting part is attached to the second plate and threadedly connected. The first-stage oil-water separator is located on the side of the hydraulic oil tank.

3. The structure according to claim 2, characterized in that: The top of the hydraulic oil tank has a first screw hole, and one end of the first plate has a first through hole. The depth of the first screw hole and the first through hole are both in the vertical direction. The first bolt passes through the first through hole and is screwed into the first screw hole to achieve threaded connection. The other end of the first plate has a second through hole, which is located above the first through hole. One end of the first connecting part has a third through hole. The depths of the second through hole and the third through hole are both horizontal. The second bolt passes through the second through hole and the third through hole and is connected by a nut to achieve a threaded connection. The primary oil-water separator is located on the rear side of the hydraulic oil tank.

4. The structure according to claim 1, characterized in that: It also includes an oil pump, which is integrated into the first-stage oil-water separator and located between the inlet of the first-stage oil-water separator and the filter cartridge, for drawing fuel from the fuel tank into the first-stage oil-water separator.

5. The structure according to claim 4, characterized in that: The oil pump is a manual press-type pump located above the primary oil-water separator.

6. The structure according to claim 1, characterized in that: It also includes an outer cover, which is hinged to the chassis. The outer cover covers the hydraulic system and the power mechanism. The outer cover has an inspection port on the side of the first-stage oil-water separator, and the inspection port is provided with an openable and closable cover.

7. The structure according to claim 6, characterized in that: The hydraulic system also includes a cylinder and a hydraulic pump. The cylinder is located inside the outer cover. One end of the cylinder is hinged to the chassis, and the other end of the cylinder is hinged to the outer cover. The input shaft of the hydraulic oil pump is connected to the second output shaft of the engine. The oil inlet of the hydraulic oil pump is connected to the hydraulic oil tank, and the oil outlet is connected to the working oil port of the oil cylinder through a reversing valve.

8. The structure according to claim 6, characterized in that: It also includes a gas spring, the cover is hinged to the access port, one end of the gas spring is hinged to the outer cover, and the other end of the gas spring is hinged to the cover.

9. The structure according to claim 6, characterized in that: The projections of the primary oil-water separator and the secondary oil-water separator are both located within the projection of the inspection port, and the projection direction is parallel to the width direction of the chassis. or: The primary oil-water separator and the secondary oil-water separator are located on the same side of the engine.

10. The structure according to claim 1, characterized in that: The chassis includes a frame and a running gear; The frame supports the pump mechanism, the hydraulic system and the power mechanism. The fuel tank is integrated inside the frame. The fuel tank's outlet and return port are located on the top of the frame. A fuel injection pipe also protrudes from the top of the frame and connects to the fuel tank. The walking mechanism is located below the vehicle frame and is used to drive the vehicle frame to move. The walking mechanism includes two walking tracks arranged side by side, and the hydraulic oil tank and the primary oil-water separator are located above the walking tracks.

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