An excavator hydraulic oil tank internal structure and hydraulic oil tank

Abstract

This invention discloses an internal structure and hydraulic oil tank for excavators, relating to the technical field of hydraulic oil tanks for construction machinery. It includes a tank shell with an internal cavity. A vertically positioned baffle plate at the bottom of the cavity divides the cavity into an interconnected suction zone and a return zone. A return oil filter is installed in the return zone, with a return oil pipe connected to its side. The bottom of the return oil filter extends below the baffle plate and has an oil outlet. A predetermined gap exists between the two ends of the baffle plate and the sidewall of the cavity, allowing oil in the return zone to flow into the suction zone from both sides of the baffle plate. An suction filter is installed in the suction zone. This invention positions the baffle plate in the middle of the tank with a gap between it and the sidewall of the cavity, connecting the return and suction zones on both sides and top of the baffle plate. This reduces the area of ​​the baffle plate and avoids excessive stress at the tank sidewall connection caused by welding the baffle plate to the tank sidewall, thus significantly reducing the risk of tank cracking.

Description

Technical Field

[0001] This invention relates to the field of hydraulic oil tank technology for engineering machinery, specifically to the internal structure of a hydraulic oil tank for excavators and the hydraulic oil tank itself. Background Technology

[0002] Currently, the hydraulic oil tanks of domestic and foreign engineering machinery, such as loaders, excavators and bulldozers, have various internal structures. They are usually equipped with baffles to separate the oil suction and return, and to reduce the turbulence of the oil in the tank caused by the impact of the return oil, so as to ensure the stability of the oil on the suction side.

[0003] Currently, the hydraulic oil tanks of excavators have relatively large internal baffles, typically welded directly to the tank sidewalls. These baffles serve both to block oil flow and provide reinforcement, but lack other reinforcing structures. This leads to significant tank deformation during oil intake and return, resulting in excessive stress in multiple locations and a risk of tank cracking. In particular, after the hydraulic oil returns through the return filter, it tumbles inside the tank. Due to the large size of the baffles and the wide stress surface, the impact of the hydraulic oil on the baffles is substantial, leading to high stress on the baffles themselves and at the connection point with the tank sidewalls, easily causing cracking and oil leakage. Summary of the Invention

[0004] In view of one or more shortcomings of the prior art, the present invention provides an internal structure and hydraulic oil tank for excavators, which can effectively improve the structural strength of the oil tank, reduce the impact of return oil, avoid excessive stress, and thus reduce the risk of cracking of the hydraulic oil tank.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: Firstly, a hydraulic oil tank internal structure for an excavator is provided, including a tank shell with a cavity inside. A vertically arranged baffle plate at the bottom of the cavity divides the cavity into an interconnected oil suction zone and an oil return zone. An oil return filter is installed in the oil return zone, within an oil return filter cartridge. An oil return pipe is connected to the side of the oil return filter cartridge, and the bottom end of the oil return filter cartridge extends below the baffle plate and has an oil outlet. There is a gap between the two ends of the baffle plate and the sidewall of the cavity, allowing oil from the oil return zone to flow into the oil suction zone from both sides of the baffle plate. An oil suction filter is installed in the oil suction zone.

[0006] As a further implementation, the oil baffle is a folded plate that bends toward the oil suction area. The bend of the oil baffle is machined with rounded corners to guide the oil from the return oil area into the oil suction area, so that the oil reduces tumbling when it returns to the oil suction area from both sides, further mitigates the return oil impact, and improves the overall stability of the oil tank.

[0007] As a further implementation, the height of the oil baffle is no higher than 1 / 2 of the cavity height to prevent excessive oil return impact on the oil baffle, reduce the stress on the oil baffle, and thus reduce the risk of cracking of the oil baffle.

[0008] As a further implementation, the bottom of the oil outlet is set with an inclined section to guide the filtered oil to flow downwards, preventing the oil from overflowing and causing it to churn.

[0009] As a further implementation, the oil suction filter is fixed to the bottom of the oil suction area by an oil suction mounting seat, and an oil suction filter cover is connected above the oil suction filter; the oil suction filter cover is fixedly installed on the top of the housing shell, thereby fixing the oil suction filter from the top and bottom sides and ensuring the stability of the oil suction filter during operation.

[0010] As a further implementation, the top of the oil suction filter is provided with a connecting rod, the top of which is connected to and limits the oil suction filter cover; the bottom of the oil suction filter cover is fixedly provided with a limiting rod, which is coaxially connected to the top of the connecting rod; preferably, the limiting rod is welded to the oil suction filter cover.

[0011] As a further implementation, the return oil filter is coaxially disposed inside the return oil filter cartridge and fixedly connected.

[0012] As a further implementation, an oil drain port is provided at the bottom of the oil return zone. The oil drain port is located at the center of the oil return zone, which can better discharge impurities and drain oil accumulated at the bottom of the oil tank. Preferably, a screw plug is provided at the oil drain port for sealing or opening the oil drain port.

[0013] As a further implementation, the height of the baffle plate is 1 / 3 of the cavity height. This avoids the baffle plate being too low, which would reduce the buffering effect on the rolling of oil inside the tank after oil return, causing instability of the oil in the oil suction area and generating air bubbles. It also avoids the baffle plate being too high, which would increase the risk of cracking of the weld at the connection between the baffle plate and the bottom plate of the tank.

[0014] As a further implementation, a spiral plate is installed on the periphery of the cavity, and the spiral plate is welded to the side wall of the cavity; one or more spiral plates are provided, and multiple spiral plates are distributed at different heights in the cavity to improve the structural strength of the hydraulic oil tank, thereby reducing deformation during oil suction and return, and extending the service life of the oil tank.

[0015] As a further implementation, a breather valve communicating with the cavity is provided on the top of the outer shell of the tank, so as to keep the inside of the tank connected with the outside, thereby maintaining a relative balance with the outside air pressure and avoiding deformation of the side wall due to changes in air pressure inside the cavity.

[0016] On the other hand, the present invention also provides a hydraulic oil tank for excavators, including an internal structure and a level gauge as described in any of the above claims, wherein the level gauge is disposed on the side wall of the oil suction area for detecting the internal oil level.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. In this invention, the oil tank structure and the oil baffle are redesigned. The oil baffle is positioned in the middle of the oil tank with a gap between it and the cavity sidewall, so that the oil return zone and the oil suction zone are connected on both sides and the top of the oil baffle. The area of ​​the oil baffle is reduced, which effectively reduces the impact force of the hydraulic oil in the oil tank on the oil baffle. At the same time, it avoids the oil return impact caused by welding the oil baffle to the sidewall of the oil tank, which would cause excessive stress at the connection of the sidewall of the oil tank. This greatly reduces the risk of oil tank cracking and can extend the service life of the oil tank.

[0018] 2. In this invention, the oil baffle is configured as a folded plate that bends toward the oil suction area and has rounded corners at the bend. This can guide the oil from the return oil area into the oil suction area, reduce the rolling of the oil when it returns to the oil suction area from both sides, further buffer the oil return of the system, reduce the deformation of the oil tank, and improve the stability of the oil tank structure.

[0019] 3. The present invention has a spiral plate welded inside the outer shell of the tank, which effectively improves the structural strength of the hydraulic oil tank, reduces the deformation of the oil tank during oil suction and return, reduces the stress on the side wall of the oil tank, and reduces the risk of cracking of the oil tank. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the overall structure of one or more embodiments of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of one or more embodiments of the present invention. Figure 2 ; Figure 3 This is a top view of one or more embodiments of the present invention; Figure 4 This is a schematic diagram of the structure of one or more embodiments of the present invention with the return oil filter cartridge removed. Figure 5 This is a side view of one or more embodiments of the present invention with the return oil filter cartridge hidden.

[0022] In the diagram: 1. Housing shell; 2. Cavity; 3. Oil baffle; 4. Oil suction area; 5. Oil return area; 6. Oil return filter; 7. Oil return filter cartridge; 8. Oil return pipe; 9. Oil outlet; 10. Oil drain port; 11. Oil suction filter; 12. Oil suction filter cover; 13. Oil suction mounting base; 14. Connecting rod; 15. Limiting rod; 16. Corrugated ring plate; 17. Breather valve. Detailed Implementation

[0023] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] Example 1 In one typical embodiment of this application, an internal structure for a hydraulic oil tank in an excavator is provided, such as... Figure 1-5 As shown, the device includes a housing 1, inside which is a cavity 2. A vertically arranged oil baffle 3 divides the cavity into an interconnected oil suction zone 4 and an oil return zone 5. An oil return filter 6 is installed in the oil return zone, within an oil return filter cartridge 7. An oil return pipe 8 is connected to the side of the oil return filter cartridge, and the bottom of the oil return filter cartridge 7 extends below the oil baffle and has an oil outlet 9. A predetermined gap exists between the two ends of the oil baffle 3 and the sidewall of the cavity 2, allowing oil from the oil return zone 5 to flow into the oil suction zone 4 from both sides of the oil baffle. An oil suction filter 11 is installed in the oil suction zone.

[0026] Specifically, such as Figure 1 As shown, the outer shell 1 of the hydraulic oil tank is welded together from a bottom plate, a top plate, and four side plates. The bottom and top of each side plate are welded and fixed to the bottom and top plates, respectively, forming a cavity 2 inside the outer shell. An oil baffle 3 is vertically welded to the bottom plate, dividing the cavity into two interconnected parts: an oil suction area 4 and an oil return area 5. The oil return area 5 is connected to the excavator's hydraulic system via a return pipe 8, allowing hydraulic oil to enter the oil return area 5 along the return pipe 8, be filtered, flow into the oil suction area 4, and then into the working equipment of the hydraulic system.

[0027] In this embodiment, as Figure 1-2 As shown, the return oil pipe 8 is fixedly installed on the side of the return oil zone 5 and communicates with the return oil filter cartridge 7. The end of the return oil pipe 8 is connected to the hydraulic system through a flange. The top of the return oil filter cartridge 7 is fixedly connected to the housing shell 1 through a flange. Specifically, the return oil filter 6 is coaxially inserted into the return oil filter cartridge 7 and fixedly connected to it. After the oil enters along the return oil pipe 8, it flows through the return oil filter 6 and the return oil filter cartridge 7 for filtration and then flows out from the bottom.

[0028] In this embodiment, combined with Figure 1-3 As shown, the oil baffle 3 is located at the bottom of the cavity 2 and does not contact the cavity sidewall. There is a predetermined gap between the two ends of the oil baffle 3 along its length and the sidewall of the cavity 2, allowing oil in the return zone to flow from both sides of the oil baffle into the suction zone. This reduces the area of ​​the oil baffle, thus reducing its impact force, and also avoids excessive stress at the tank sidewall connection caused by the oil baffle being welded to the cavity sidewall, which could lead to return oil impact and reduce the risk of tank cracking. The size of the gap is determined according to the tank specifications and actual requirements.

[0029] Furthermore, such as Figure 3-4 As shown, the oil baffle 3 is a folded plate that bends towards the oil suction area. The bend of the oil baffle 3 is machined with rounded corners to guide the oil from the return oil area into the oil suction area, so that the oil reduces tumbling when it returns to the oil suction area from both sides, further slows down the return oil impact, and improves the stability of the oil tank structure.

[0030] Furthermore, to ensure that the oil enters the suction zone after filtration, the height of the oil baffle plate is not lower than the bottom height of the return oil filter cartridge 7, and the height of the oil baffle plate does not exceed 1 / 2 of the cavity height. This prevents excessive impact from the return oil on the oil baffle plate, reduces the stress on the oil baffle plate, and thus reduces the risk of cracking at the connection between the oil baffle plate and the bottom plate of the oil tank, avoiding cracking of the weld between the two. Furthermore, combined with... Figure 1 , 4 As shown, the return oil filter cartridge 7 extends below the top of the oil baffle plate 3. The bottom of the return oil filter cartridge 7 is connected to an oil outlet 9, which is a vertically arranged pipe with a slanted bottom section to guide the filtered oil downwards, preventing the oil from overflowing and causing turbulence. The filtered oil enters the return oil zone from the oil outlet and then flows into the suction zone from both sides of the oil baffle plate. In this embodiment, the height of the oil baffle plate is 1 / 3 of the cavity height. This avoids the reduced buffering effect on the turbulence of the oil inside the tank after return oil due to the oil baffle plate being too low, which would cause instability and air bubbles in the suction zone. Simultaneously, it prevents the increased risk of cracking at the weld joint between the oil baffle plate and the tank bottom plate due to the oil baffle plate being too high.

[0031] like Figure 3As shown, an oil suction filter 11 is fixedly installed at the bottom of the oil suction zone 4 to further filter the hydraulic oil entering the hydraulic system, preventing impurities in the hydraulic oil from damaging hydraulic components or affecting the operation of the entire machine. The oil suction filter 11 is fixed to the bottom of the oil suction zone 4 by the oil suction mounting seat 13. A connecting rod 14 is provided at the top of the oil suction filter 11. The top of the connecting rod 14 is coaxially connected to the oil suction filter cover 12, forming a radial limit. The oil suction filter cover 12 is fixedly connected to the top plate of the housing 1 by flanges and bolts, thereby fixing the oil suction filter in the oil suction zone from the top and bottom sides, ensuring the stability of the oil suction filter during operation, and facilitating disassembly for cleaning or maintenance. For example, Figure 5 As shown, a limiting rod 15 is welded and fixed to the bottom of the oil suction filter cover 12. The limiting rod 15 is set vertically and coaxially inserted with the connecting rod 14, which constrains the top of the connecting rod 14, preventing it from shaking radially, thereby ensuring the stability of the structure.

[0032] Specifically, to enhance the structural strength of the fuel tank and better withstand the impact of oil suction and return, a U-shaped ring plate is installed on the periphery inside the tank shell, such as... Figure 1 As shown, two layers of spiral plates 16 are welded at intervals within the cavity 2. Each spiral plate 16 is welded to the side plates of the surrounding outer shell of the tank, which can improve the structural strength of the hydraulic oil tank, reduce tank deformation during oil suction and return, and extend the service life of the oil tank. The number of spiral plates and the height interval between adjacent spiral plates can be selected according to the tank height and material suitability; this application does not impose any restrictions on this. Furthermore, in this embodiment, the inner corners of the spiral plates 16 are all rounded to reduce stress at these bends. The rounded corners diffuse the stress, preventing it from concentrating at a single point.

[0033] The spiral plate and the oil baffle are made of Q355B steel plate.

[0034] In addition, in this embodiment, as Figure 1-2 As shown, the bottom of the oil return zone 5 is provided with an oil drain port 10. The oil drain port 10 is located at the center of the oil return zone 5, which can better discharge the impurities accumulated at the bottom of the oil tank and drain the oil. A screw plug can be installed at the oil drain port to seal or open the oil drain port.

[0035] like Figure 1 , 2As shown, two breather valves 17 are installed on the top of the outer shell 1 of the tank. The breather valves 17 are connected to the internal cavity 2, which allows the inside of the oil tank to be connected to the outside, thereby maintaining the relative balance between the pressure inside the cavity and the atmospheric pressure and preventing the side wall from deforming due to changes in the air pressure inside the cavity. In this embodiment, the breather valve 17 is located at the top of the oil suction area 4, and a protective plate is fixedly installed inside the breather valve to prevent hydraulic oil from leaking from the breather valve when the vehicle body is working on a slope, or when the tank body is tilted under other working conditions, or when there is too much oil in the oil tank and the vehicle body shakes.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Those skilled in the art should understand that the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An internal structure of a hydraulic oil tank for an excavator, characterized in that, The device includes an outer casing with an internal cavity. A vertically positioned oil baffle at the bottom of the cavity divides it into an interconnected oil suction zone and an oil return zone. An oil return filter is installed within the oil return filter housing, which is connected to an oil return pipe on its side. The bottom of the oil return filter housing extends below the oil baffle and has an oil outlet. There is a gap between the two ends of the oil baffle and the sidewall of the cavity, allowing oil from the oil return zone to flow into the oil suction zone from both sides of the oil baffle. An oil suction filter is installed within the oil suction zone.

2. The internal structure of a hydraulic oil tank for an excavator as described in claim 1, characterized in that, The oil baffle is a folded plate that bends toward the oil suction area. The bend of the oil baffle is machined with rounded corners to guide the oil from the return oil area into the oil suction area.

3. The internal structure of a hydraulic oil tank for an excavator as described in claim 1, characterized in that, The height of the oil baffle does not exceed 1 / 2 of the cavity height; preferably, the height of the oil baffle is 1 / 3 of the cavity height.

4. The internal structure of a hydraulic oil tank for an excavator as described in claim 1, characterized in that, The bottom of the oil outlet is designed with an inclined section to guide the filtered oil to flow downwards.

5. The internal structure of a hydraulic oil tank for an excavator as described in claim 1, characterized in that, The oil suction filter is fixed to the bottom of the oil suction area by an oil suction mounting seat, and an oil suction filter cover is connected above the oil suction filter; the oil suction filter cover is fixedly installed on the top of the housing shell; preferably, the top of the oil suction filter is provided with a connecting rod, the top of the connecting rod is connected to and limited by the oil suction filter cover; a limiting rod is fixedly provided at the bottom of the oil suction filter cover, and the limiting rod is coaxially connected to the top of the connecting rod.

6. The internal structure of a hydraulic oil tank for an excavator as described in claim 1, characterized in that, The return oil filter is coaxially disposed inside the return oil filter cylinder and fixedly connected.

7. The internal structure of a hydraulic oil tank for an excavator as described in claim 1, characterized in that, The bottom of the oil return zone is provided with an oil drain port, which is located at the center of the oil return zone.

8. The internal structure of a hydraulic oil tank for an excavator as described in claim 1, characterized in that, The top of the outer shell of the box is provided with a breathing valve that communicates with the cavity.

9. The internal structure of a hydraulic oil tank for an excavator as described in claim 3, characterized in that, A spiral plate is installed around the periphery of the cavity, and the spiral plate is welded to the side wall of the cavity; one or more spiral plates are provided, and multiple spiral plates are distributed at different heights inside the cavity.

10. A hydraulic oil tank for an excavator, characterized in that, Includes the internal structure of the hydraulic oil tank and the level gauge as described in any one of claims 1-9, wherein the level gauge is disposed on the side wall of the oil suction area for detecting the internal oil level.

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