Low-position oil return hydraulic oil tank and mining dump truck

By designing an independent return port and return box in the hydraulic oil tank of a mining dump truck, combined with a return diffuser, the problems of impact on welded pipes and difficulties in pipeline layout during hydraulic oil return are solved, thus achieving protection of welded pipes and optimized pipeline layout.

CN224032851UActive Publication Date: 2026-03-24AEROSPACE HEAVY IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-09
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

The design of the hydraulic oil tank return port position of the mining dump truck results in excessive impact load on the welded pipe, and makes the layout of the return oil pipeline and suction oil pipeline difficult.

Method used

A low-position return hydraulic oil tank is designed, which adopts an independent return oil port connected to a small-flow single-path return oil pipe, and a return oil box is set at the bottom of the hydraulic oil tank. Multiple return oil diffusers are set at the oil outlet end of the return oil box. One end of the external welded pipe is connected to the oil inlet end of the return oil box, and the other end is bent to the bottom of the oil outlet end of the suction box and connected to the large-flow return oil pipe. This reduces the impact of large-flow hydraulic oil on the welded pipe and avoids pipeline interference.

Benefits of technology

It reduces the impact load on the welded pipe when the hydraulic oil returns, simplifies the pipeline layout, and improves the stability and convenience of using the hydraulic oil tank.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a low-position oil return hydraulic oil tank and a mining dump truck, and relates to the technical field of mining dump trucks. The low-position oil return hydraulic oil tank comprises a hydraulic oil tank body and an external welded pipe, the hydraulic oil tank body comprises an oil suction cavity and an oil return cavity which are horizontally distributed, an oil suction box and an oil return box are arranged at the bottoms of the side walls of the same sides of the oil suction cavity and the oil return cavity respectively, and a plurality of oil return diffusers are arranged at the oil outlet end of the oil return box. The multiple oil return diffusers are arranged in the oil return cavity, and the oil return box is used for oil return of large-flow hydraulic oil; the top wall of the oil return cavity is further provided with an independent oil return opening, and the independent oil return opening is used for being connected with an oil return pipe for small-flow single-way oil return and is further used for being welded to an internal welded pipe. One end of the external welded pipe is communicated with the oil inlet end of the oil return box, and the other end of the external welded pipe is bent, extends to the position below the oil inlet end of the oil suction cavity, is connected with the hydraulic oil tank and is used for being communicated with a large-flow oil return pipe.
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Description

TECHNICAL FIELD

[0001] The utility model relates to mining dump truck technical field, specifically, relate to a low oil return hydraulic oil tank and mining dump truck. BACKGROUND

[0002] The position of the oil return port of the hydraulic oil tank of the current mining dump truck can be divided into two kinds of the top of the oil tank and below the oil tank. When the oil tank top returns oil, the hydraulic oil flows quickly from top to bottom, the impact load of the internal welded pipe is too large, and the welded seam is cracked in severe cases. When the oil tank below returns oil, the oil return pipeline and the oil suction pipeline are arranged together, which makes the oil return pipeline compact and the layout difficult. SUMMARY

[0003] The utility model solves the problem: how to reduce the impact load of the internal welded pipe, and consider the layout of the oil return pipeline and the oil suction pipeline.

[0004] To solve the above problems, on the one hand, the utility model provides a kind of low oil return hydraulic oil tank, including hydraulic oil tank and external welded pipe, the hydraulic oil tank includes horizontally distributed oil suction chamber and oil return chamber, the side wall bottom of the same side of the oil suction chamber and the oil return chamber is respectively provided with oil suction box and oil return box, the oil outlet end of the oil return box is provided with multiple oil return diffusers, multiple the oil return diffuser is placed in the oil return chamber, and the oil return box is used for large flow hydraulic oil return;The top wall of the oil return chamber is also provided with independent oil return port, the independent oil return port is used for connecting the oil return pipe of small flow single-way oil return, and is also used for being welded with internal welded pipe;

[0005] One end of the external welded pipe is communicated with the oil inlet end of the oil return box, the other end of the external welded pipe is bent and extended below the oil outlet end of the oil suction box, and is connected with the hydraulic oil tank, and is used for being communicated with large flow oil return pipe.

[0006] Optionally, the hydraulic oil tank further includes an oil suction box mounted to the side wall bottom of the oil suction chamber, the oil inlet end of the oil suction box is used for connecting an oil suction pipe, and the oil outlet end of the oil suction box is provided with a plurality of oil suction filters, and the plurality of oil suction filters are placed in the oil suction chamber.

[0007] Optionally, the hydraulic oil tank is further provided with a temperature sensor and a liquid level sensor, the temperature measuring end of the temperature sensor is placed in the interior of the hydraulic oil tank, the liquid level sensor is located on the top wall of the hydraulic oil tank, and the detection end of the liquid level sensor is located in the interior of the hydraulic oil tank.

[0008] Optionally, the top wall of the hydraulic oil tank is further provided with an air filter.

[0009] Optionally, the hydraulic oil tank is further provided with a refueling port and an oil mark.

[0010] Optionally, a cleaning cover for cleaning the hydraulic oil tank is arranged on the side wall of the oil suction chamber and the oil return chamber, a quick oil drain port is arranged on the oil suction chamber, and a bottom oil drain port is arranged on the bottom wall of the oil suction chamber and the oil return chamber.

[0011] Optionally, the low-position oil return hydraulic oil tank further comprises a support pipe, a pressing block and a support pipe support seat, the support pipe is installed on the hydraulic oil tank, the support pipe support seat is used for being installed on a vehicle frame, and the support pipe is clamped to the support pipe support seat through the pressing block.

[0012] Optionally, the hydraulic oil tank is further used for being installed on the vehicle frame through a damping structure.

[0013] Optionally, an ear for hoisting is further arranged on the hydraulic oil tank.

[0014] Compared with the prior art, the low-position oil return hydraulic oil tank has the following advantages: the independent oil return port is arranged on the top wall of the hydraulic oil tank, the independent oil return port is connected with the oil return pipe of the small-flow single-path oil return, the impact of the hydraulic oil on the internal welded pipe when the hydraulic oil returns through the independent oil return port is reduced, the oil return box is arranged at the bottom of the hydraulic oil tank, the oil return box is used for large-flow hydraulic oil return, the oil outlet end of the oil return box is provided with a plurality of oil return diffusers, the large-flow hydraulic oil can form a small flow after passing through the plurality of oil return diffusers, so that the impact of the large-flow hydraulic oil on the internal welded pipe is reduced, one end of the external welded pipe which is in communication with the oil return box and the oil suction box and connected with the large-flow oil return pipe is in communication with the oil inlet end of the oil return box, the other end of the external welded pipe is bent and extended to below the oil inlet end of the oil suction chamber and connected with the hydraulic oil tank, the external welded pipe enables the large-flow oil return pipe to be in communication with the oil inlet end of the oil return box below the oil inlet port of the oil suction chamber, so as to avoid the interference of the large-flow oil return pipe with the oil suction pipe in the pipeline layout, and thus the layout of the large-flow oil return pipe and the oil suction pipe is considered.

[0015] On the other hand, the utility model further provides a mine dump truck, including low-position oil return hydraulic oil tank as mentioned above.

[0016] The mine dump truck has all the beneficial effects of the low-position oil return hydraulic oil tank, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1This is a schematic diagram of the low-position return hydraulic oil tank in an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the oil return box in an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the oil-absorbing box in an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the bottom oil drain port in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the installation of the low-position return hydraulic oil tank in an embodiment of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Hydraulic oil tank; 2-Suction box; 3-Return box; 4-Return diffuser; 5-Independent return port; 6-External welded pipe; 7-Suction filter; 8-Temperature sensor; 9-Level sensor; 10-Air filter; 11-Filling port; 12-Oil level indicator; 13-Cleaning cap; 14-Quick drain port; 15-Bottom drain port; 16-Support pipe; 17-Pressure block; 18-Support pipe support seat; 19-Shock absorption structure; 20-Frame; 21-Lifting lug. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0026] Currently, the return oil port of the hydraulic oil tank in mining dump trucks can be located in two ways: at the top of the tank and at the bottom. When returning oil from the top of the tank, the hydraulic oil flows rapidly from top to bottom, causing excessive impact load on the internal welded pipes, which can lead to weld cracking in severe cases. When returning oil from the bottom of the tank, the return oil pipeline and the suction oil pipeline are arranged together, making the return oil pipeline compact and difficult to lay out.

[0027] For example, in the hydraulic oil tank, when the top of the hydraulic oil tank is provided with an oil return port, an internal welded pipe is usually installed inside the hydraulic oil tank, one end of the internal welded pipe is welded at the oil return port, the other end of the internal welded pipe extends into the hydraulic oil tank, and a device such as an electric control valve can be installed on the internal welded pipe to adjust the flow rate of the hydraulic oil return. When the hydraulic oil is returned at a large flow rate, the hydraulic oil flows quickly from top to bottom, at this time, the weld joint of the internal welded pipe connected with the oil return port bears a large impact load, and during the large flow rate return process, the weld joint is easy to break, affecting the use of the internal welded pipe.

[0028] In combination with Figure 1 and Figure 2 The utility model provides a low position oil return hydraulic oil tank, including hydraulic oil tank 1 and external welded pipe 6, hydraulic oil tank 1 includes the oil suction chamber and oil return chamber of horizontal distribution, and the bottom of the side wall of the same side of oil suction chamber and oil return chamber is provided with oil suction box 2 and oil return box 3 respectively, and the oil outlet end of oil return box 3 is provided with a plurality of oil return diffusers 4, a plurality of oil return diffusers 4 are placed in the oil return chamber, and oil return box 3 is used for large flow rate hydraulic oil return;The top wall of the oil return chamber is further provided with an independent oil return port 5, the independent oil return port 5 is used for connecting the oil return pipe of small flow rate single way oil return, and is further used for welding with the internal welded pipe;One end of external welded pipe 6 is communicated with the oil inlet end of oil return box 3, the other end of external welded pipe 6 is bent and extends to below the oil outlet end of oil suction box 2, and is connected with hydraulic oil tank 1, and is used for being communicated with the large flow rate oil return pipe.

[0029] Specifically, the inside of the hydraulic oil tank 1 is divided into an oil suction chamber and an oil return chamber by a partition plate, and the oil suction chamber and the oil return chamber are distributed along the Y axis. The right side of the hydraulic oil tank 1, i.e., the side pointing to the positive direction of the X axis, is provided with an oil suction box 2 and an oil return box 3 at the bottom of the side wall on the right side of the oil suction chamber and the oil return chamber, respectively. The hydraulic oil in the oil suction chamber is extracted through the oil suction box 2. The right end of the oil suction box 2 (the end away from the oil suction chamber) is the oil outlet end of the oil suction box 2. The left end of the oil suction box 2 (the end close to the oil suction chamber) is the oil inlet end of the oil suction box 2. In the oil return box 3, the right end of the oil return box 3 (the end away from the oil return chamber) is the oil inlet end of the oil return box 3. The left end of the oil return box 3 (the end close to the oil return chamber) is the oil outlet end of the oil return box 3. The oil outlet end of the oil return box 3 is located in the oil return chamber. The oil outlet end of the oil return box 3 can be provided with two oil outlets. Two oil return diffusers 4 are installed on the two oil outlets through oil return pipes, respectively. The oil return diffuser 4 is in the shape of a cylinder as a whole and is hollow inside. A plurality of small holes are provided on the side wall of the oil return diffuser 4. After the high-flow hydraulic oil entering the oil return box 3 passes through the plurality of small holes on the oil return diffuser 4, it becomes low-flow hydraulic oil and enters the oil return chamber, so as to avoid the impact of the high-flow hydraulic oil return on the internal welding pipe of the hydraulic oil tank 1. At the same time, the top wall of the oil return chamber is also provided with an independent oil return port 5 connected with the oil return pipe of the single-way oil return. Since the independent oil return port 5 is connected with the oil return pipe of the single-way oil return, and the oil return pipe of the single-way oil return is usually thin, the flow of the hydraulic oil inside is small. Therefore, when the oil return is performed through the independent oil return port 5, the flow in the independent oil return port 5 is small, and the impact on the internal welding pipe welded with the independent oil return port 5 is small during the downward flow of the small flow, so as to avoid the welding seam from being opened. When the oil return box 3 is connected with the high-flow oil return pipe, one end of an external welding pipe 6 is connected with the oil inlet port of the oil return box 3 through a bolt. The other end of the external welding pipe 6 is bent downward and extends below the oil outlet port of the oil suction box 2, and then is fixed through a connecting seat at the bottom of the hydraulic oil tank 1 and is in communication with the high-flow hydraulic oil return pipe, so that the high-flow hydraulic oil return pipe can be in communication with the oil inlet port of the oil return box 3 below the oil outlet port of the oil suction box 2. In terms of spatial position, the high-flow oil return pipe and the oil suction pipe are distributed above and below, so that the layout is relatively simple.

[0030] Therefore, in the embodiment, the independent oil return port 5 is arranged on the top wall of the hydraulic oil tank 1, the independent oil return port 5 is connected with the oil return pipe for small-flow single-path oil return, and the impact of the hydraulic oil on the internal welded pipe when the hydraulic oil returns through the top wall of the hydraulic oil tank 1 can be reduced. The oil return box 3 is arranged at the bottom of the hydraulic oil tank 1, the oil return box 3 is used for large-flow hydraulic oil return, the oil outlet end of the oil return box 3 is provided with a plurality of oil return diffusers 4, the large-flow hydraulic oil can form small flow after passing through the plurality of oil return diffusers 4, so that the impact of the large-flow hydraulic oil on the internal welded pipe can be reduced. The oil return box 3 and the oil suction box 2 are located on the same side, one end of the external welded pipe 6 connected with the large-flow oil return pipe is communicated with the oil inlet end of the oil return box 3, the other end of the external welded pipe 6 is bent and extended to below the oil outlet end of the oil suction box 2, and is connected with the hydraulic oil tank 1. The welded pipe 6 enables the large-flow oil return pipe to be communicated with the oil inlet end of the oil return box 3 below the oil outlet end of the oil suction box 2, so as to avoid the interference of the pipeline layout caused by the large-flow oil return pipe and the oil outlet end of the oil suction box 2. In this way, when the hydraulic oil tank returns oil, the large-flow hydraulic oil can enter the hydraulic oil tank through the plurality of oil return diffusers 4 of the oil return box 3, and the small-flow hydraulic oil can enter the hydraulic oil tank through the independent oil return port 5. The impact of the hydraulic oil on the internal welded pipe when the hydraulic oil returns can be effectively avoided, and the external welded pipe 6 can be used to avoid the interference of the pipeline layout of the large-flow hydraulic oil return pipe and the oil suction pipeline, so as to balance the layout of the large-flow hydraulic oil return pipe and the oil suction pipeline.

[0031] Optionally, in combination with Figure 3 As shown in the figure, the oil outlet end of the oil suction box 2 is used for connecting the oil suction pipe, and the oil inlet end of the oil suction box 2 is provided with a plurality of oil suction filters 7.

[0032] Specifically, the oil suction box 2 is located at the bottom of the right side wall of the oil suction cavity, the oil outlet end of the oil suction box 2 is connected with the oil suction pipe through a flange or other existing technology, and the oil inlet end of the oil suction box 2 is fitted with two oil suction filters 7, and the two oil suction filters 7 are arranged in the oil suction cavity.

[0033] In this way, the oil outlet end of the oil suction box 2 is used for connecting the oil suction pipe, the oil inlet end of the oil suction box 2 is provided with a plurality of oil suction filters 7, and the plurality of oil suction filters 7 are arranged in the oil suction cavity. The plurality of oil suction filters 7 can not only improve the filtering efficiency of the hydraulic oil, but also realize oil suction distribution, so that the large-flow oil suction efficiency can be improved when the large-flow hydraulic oil is suctioned.

[0034] In some embodiments, the oil suction box 2 is provided with two flange butterfly valves to control the opening and closing of the oil suction port.

[0035] Optionally, in combination with Figure 1As shown, the hydraulic oil tank 1 is further provided with a temperature sensor 8 and a liquid level sensor 9. The temperature sensor 8 is arranged in the interior of the hydraulic oil tank 1, and the liquid level sensor 9 is arranged on the top wall of the hydraulic oil tank 1, and the detection end of the liquid level sensor 9 is arranged in the interior of the hydraulic oil tank 1.

[0036] Specifically, the temperature sensor 8 and the liquid level sensor 9 can be mounted on the hydraulic oil tank 1 by threaded fasteners. The temperature sensor 8 is arranged in the interior of the hydraulic oil tank 1, and the liquid level sensor 9 is arranged on the top wall of the hydraulic oil tank 1, and the detection end of the liquid level sensor 9 is arranged in the interior of the hydraulic oil tank 1.

[0037] In this way, by arranging the temperature sensor 8 in the interior of the hydraulic oil tank 1 and arranging the liquid level sensor 9 on the top wall of the hydraulic oil tank 1 and arranging the detection end of the liquid level sensor 9 in the interior of the hydraulic oil tank 1, not only the feedback of the liquid level of the hydraulic oil in the hydraulic oil tank 1 can be realized, but also the timely feedback of the temperature in the hydraulic oil tank 1 can be realized, and the use convenience of the hydraulic oil tank 1 can be improved.

[0038] Optionally, the top wall of the hydraulic oil tank 1 is further provided with an air filter 10.

[0039] Specifically, the air filter 10 can filter dust or impurities in the air.

[0040] In this way, by arranging the air filter 10 on the top wall of the hydraulic oil tank 1, the air filter 10 can not only ensure the balance of the pressure inside and outside the hydraulic oil tank 1, but also avoid dust or impurities in the air entering the hydraulic oil tank 1, and ensure the cleanliness of the hydraulic oil.

[0041] Optionally, in combination with Figure 4 and Figure 5 As shown, the hydraulic oil tank 1 is further provided with a filling port 11 and an oil mark 12.

[0042] Specifically, the filling port 11 can be arranged on the top wall of the hydraulic oil tank 1, and the oil mark 12 can be arranged on the side wall of the hydraulic oil tank 1 close to the top. When supplementing the hydraulic oil, the hydraulic oil can be supplemented into the hydraulic oil tank 1 through the filling port 11, and during the supplementing process, the oil mark 12 can be observed to determine the amount of hydraulic oil in the hydraulic oil tank 1.

[0043] In this way, by arranging the filling port 11 and the oil mark 12 on the top of the hydraulic oil tank 1, the hydraulic oil height can be observed through the oil mark 12 during the process of supplementing the hydraulic oil.

[0044] Optionally, in combination with Figure 4 and Figure 5As shown, the side walls of the oil suction chamber and the oil return chamber are further provided with cleaning covers 13 for cleaning the hydraulic oil tank, and the oil suction chamber is further provided with a quick oil drain port 14, and the bottom walls of the oil suction chamber and the oil return chamber are respectively provided with bottom oil drain ports 15.

[0045] Specifically, the cleaning covers 13 are installed on the front and rear side walls of the hydraulic oil tank 1 by threaded fasteners, and when the oil suction chamber and the oil return chamber need to be cleaned, the cleaning covers 13 can be removed from the hydraulic oil tank 1 to clean the inside of the hydraulic oil tank 1, the quick oil drain port 14 is installed on the bottom of the front side wall of the oil suction chamber, and the quick oil drain port 14 is composed of a valve and can realize quick oil drainage, and the bottom walls of the oil suction chamber and the oil return chamber are respectively provided with bottom oil drain ports 15 to ensure that the hydraulic oil in the oil suction chamber and the oil return chamber can be completely drained when needed.

[0046] In this way, by providing the cleaning covers 13 on the side walls of the oil suction chamber and the oil return chamber for cleaning the hydraulic oil tank, the oil suction chamber is further provided with the quick oil drain port 14, and the bottom walls of the oil suction chamber and the oil return chamber are respectively provided with the bottom oil drain ports 15, not only can the cleaning of the inside of the hydraulic oil tank 1 be facilitated by the cleaning covers 13, but also quick oil drainage can be realized by the quick oil drain port 14 and the bottom oil drain ports 15, thereby ensuring the convenience of use of the hydraulic oil tank 1.

[0047] Optionally, the low-position oil return hydraulic oil tank further comprises a support pipe 16, a pressing block 17 and a support pipe support seat 18, the support pipe 16 is installed on the hydraulic oil tank 1, the support pipe support seat 18 is used to be installed on the vehicle frame 20, and the support pipe 16 is clamped to the support pipe support seat 18 through the pressing block 17.

[0048] Specifically, the support pipe 16 is installed on the right side wall of the hydraulic oil tank 1, the support pipe support seat 18 is installed on the vehicle frame 20 by threaded fasteners, the top wall of the support pipe support seat 18 is provided with a clamping groove, the support pipe 16 is clamped in the clamping groove on the top wall of the support pipe support seat 18, and the pressing block 17 is installed on the support pipe support seat 18 by threaded fasteners to clamp the support pipe 16 with the support pipe support seat 18.

[0049] In this way, the support pipe 16 is installed on the hydraulic oil tank 1, the support pipe support seat 18 is used to be installed on the vehicle frame 20, and the support pipe 16 is clamped to the support pipe support seat 18 through the pressing block 17, so that the pressing block 17 can clamp the support pipe 16 with the support pipe support seat 18 to limit the support pipe 16, thereby limiting the hydraulic oil tank 1 on the vehicle frame 20 to ensure the installation stability of the hydraulic oil tank 1.

[0050] Optionally, the hydraulic oil tank 1 is further used to be installed on the vehicle frame 20 through a damping structure 19.

[0051] Specifically, the damping structure 19 comprises a damper, a damper mounting seat mounted on the hydraulic oil tank 1, and a damper support mounted on the vehicle frame 20, the damper is mounted on the hydraulic oil tank 1 through the damper mounting seat and mounted on the vehicle frame 20 through the damper support.

[0052] In this way, by mounting the hydraulic oil tank 1 on the vehicle frame 20 through the damping structure 19, the damping structure 19 can reduce the vibration of the hydraulic oil tank 1, thereby ensuring the stability of the hydraulic oil tank 1.

[0053] Optionally, in combination with Figure 1 As shown, the hydraulic oil tank 1 is further provided with lifting lugs 21 for lifting.

[0054] Specifically, the two lifting lugs 21 are respectively mounted on the two side walls on the front side of the hydraulic oil tank 1 and are respectively provided with lifting holes, so that the hydraulic oil tank 1 can be lifted to improve the installation efficiency of the hydraulic oil tank 1.

[0055] Another embodiment of the utility model further provides a mine dump truck, comprising the foregoing low-position return oil hydraulic oil tank.

[0056] The mine dump truck has all the beneficial effects of the low-position return oil hydraulic oil tank, which will not be repeated here.

[0057] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only.The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall into the protection scope of the utility model.

Claims

1. A low-position return hydraulic oil tank, characterized in that, The system includes a hydraulic oil tank (1) and an external welded pipe (6). The hydraulic oil tank (1) includes a horizontally distributed oil suction chamber and an oil return chamber. An oil suction box (2) and an oil return box (3) are respectively provided at the bottom of the side wall on the same side of the oil suction chamber and the oil return chamber. Multiple oil return diffusers (4) are provided at the oil outlet end of the oil return box (3). The multiple oil return diffusers (4) are placed in the oil return chamber. The oil return box (3) is used for large flow hydraulic oil return. An independent oil return port (5) is also provided on the top wall of the oil return chamber. The independent oil return port (5) is used to connect the oil return pipe of small flow single-path oil return and is also used for welding with the internal welded pipe. One end of the external welded pipe (6) is connected to the oil inlet end of the return oil box (3), and the other end of the external welded pipe (6) is bent and extended to the bottom of the oil outlet end of the suction box (2) and connected to the hydraulic oil tank (1), and is used to connect to the high flow return oil pipe.

2. The low-position return hydraulic oil tank according to claim 1, characterized in that, The hydraulic oil tank also includes an oil suction box (2), which is installed at the bottom of the side wall of the oil suction chamber. The oil outlet of the oil suction box (2) is used to connect to the oil suction pipe. The oil inlet of the oil suction box (2) is provided with multiple oil suction filters (7), which are placed inside the oil suction chamber.

3. The low-position return hydraulic oil tank according to claim 2, characterized in that, The hydraulic oil tank is also equipped with a temperature sensor (8) and a liquid level sensor (9). The temperature measuring end of the temperature sensor (8) is placed inside the hydraulic oil tank (1), and the liquid level sensor (9) is located on the top wall of the hydraulic oil tank. The detection end of the liquid level sensor (9) is located inside the hydraulic oil tank (1).

4. The low-position return hydraulic oil tank according to claim 1, characterized in that, An air filter (10) is also provided on the top wall of the hydraulic oil tank (1).

5. The low-position return hydraulic oil tank according to claim 1, characterized in that, The hydraulic oil tank (1) is also equipped with an oil filler port (11) and an oil level indicator (12).

6. The low-position return hydraulic oil tank according to claim 1, characterized in that, The side walls of the oil suction chamber and the oil return chamber are also provided with cleaning covers (13) for cleaning the hydraulic oil tank. The oil suction chamber is also provided with a quick oil drain port (14). The bottom walls of the oil suction chamber and the oil return chamber are respectively provided with bottom oil drain ports (15).

7. The low-position return hydraulic oil tank according to claim 1, characterized in that, It also includes a support tube (16), a pressure block (17) and a support tube support seat (18). The support tube (16) is installed in the hydraulic oil tank (1), and the support tube support seat (18) is used to be installed on the frame (20). The support tube (16) is snapped into the support tube support seat (18) by the pressure block (17).

8. The low-position return hydraulic oil tank according to claim 7, characterized in that, The hydraulic tank (1) is also used to be mounted on the frame (20) via a shock-absorbing structure (19).

9. The low-position return hydraulic oil tank according to claim 1, characterized in that, The hydraulic oil tank (1) is also equipped with lifting lugs (21) for hoisting.

10. A mining dump truck, characterized in that, Includes the low-position return hydraulic oil tank as described in any one of claims 1-9.