Hydraulic oil tank and pump truck

Abstract

The present invention relates to the field of engineering machinery, and discloses a hydraulic oil tank and a pump truck, wherein the hydraulic oil tank comprises a box body, wherein an oil return hood with grille holes is arranged in the box body, and the oil return hood divides the inner cavity of the box body into an oil return chamber and an oil suction chamber connected to the oil return chamber; the box body is provided with a reflux filter port connected to the oil return chamber, and a water collecting device is arranged at the bottom of the box body. The arrangement of the oil return hood of the present invention increases the turbulent flow path of the oil, which is conducive to the escape of bubbles in the oil, and can effectively reduce the bubbles in the oil; at the same time, since water exists in the oil in a free state, the density of water is greater than that of hydraulic oil, and it will slowly settle to the bottom of the oil tank, enter the water collecting device, and then be discharged from the water collecting device, which effectively reduces the water content in the oil, improves the oil quality, prolongs the service life of hydraulic components, and improves the reliability of the hydraulic system.

Description

Technical Field

[0001] The present invention relates to the field of engineering machinery, and in particular to a hydraulic oil tank and a pump truck. Background Art

[0002] The hydraulic oil tank, which is a container for hydraulic oil, is an important component in the hydraulic system. The oil in the hydraulic system will flow back to the oil tank in whole or in part due to the open or closed system. If the oil entering the oil tank can ensure the bubble precipitation and water precipitation, the oil sucked into the actuator will be less polluted. If the free water in the oil is not discharged in time and is sucked into the hydraulic actuator, it will form a tiny suspension under the violent stirring of the oil pump or the shearing action of the valve parts, and it cannot settle to the bottom of the oil tank, and the oil will float, resulting in reduced oil quality.

[0003] The sources of water in the oil in the oil tank are mainly two parts: one is the oil tank pressure regulating breathing valve, the water in the air enters the oil; the other is that during the back and forth movement of the oil cylinder and the concrete cylinder, the pumping oil cylinder is connected to the concrete cylinder on the other side, and there is a cooling water tank in the middle to cool the concrete cylinder, and water enters the hydraulic system from the piston rod sealing ring. The existing technology only considers the filtration of water at the inlet of the breathing valve, and does not fully consider the separation and discharge of water after the oil in the oil tank contains water. Summary of the invention

[0004] In order to solve the technical problem that bubbles and water in oil are difficult to remove in the prior art, the purpose of the present invention is to provide a hydraulic oil tank, which can not only effectively reduce the bubbles in the oil, but also reduce the water content in the oil, improve the oil quality, extend the service life of hydraulic components, and enhance the reliability of the hydraulic system.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a hydraulic oil tank, including a tank body, wherein an oil return hood with grille holes is arranged in the tank body, the oil return hood divides the inner cavity of the tank body into an oil return chamber and an oil suction chamber connected to the oil return chamber, the tank body is provided with a reflux filter port connected to the oil return chamber, and a water collecting device is arranged at the bottom of the tank body.

[0006] Furthermore, the edge of the oil return hood is connected to the inner wall of the box body, the inner wall of the oil return hood and the inner wall of the box body form the oil return chamber, and the outer wall of the oil return hood and the inner wall of the box body form the oil suction chamber.

[0007] Furthermore, the oil return cover has a first plate body arranged opposite to the bottom plate of the box body, the first plate body is arranged obliquely, and the grille holes are arranged on the first plate body.

[0008] Furthermore, the oil return cover has a second plate body which is arranged on the bottom plate of the box body and can support the first plate body, and the grille hole is arranged on a side of the second plate body away from the bottom of the box body.

[0009] Furthermore, a water hole is provided on one side of the second plate body close to the bottom plate of the box body.

[0010] Furthermore, the oil return cover also has a third plate body arranged between the bottom plate of the box body and the first plate body, and the side edge of the third plate body is connected to the side edge of the second plate body.

[0011] Furthermore, the box body is provided with an oil return port of the main valve group, and the oil return chamber is provided with an oil return box which is covered on the oil return port of the main valve group and connected to the oil return chamber.

[0012] Furthermore, a through hole is provided on the bottom plate of the box body, and the water collecting device includes a water collecting box arranged on the outer wall of the bottom plate of the box body and connected to the through hole, and the water collecting box is provided with a drain outlet; or, the water collecting device includes a trough formed by a downward depression of the bottom plate of the box body, and the trough is provided with a drain outlet.

[0013] Furthermore, it also includes a first baffle plate which is detachably installed in the oil suction chamber and covers the water inlet of the water collecting device, and the water separated from the oil can enter the water collecting device through the first baffle plate.

[0014] Furthermore, the first baffle is arranged on the bottom plate of the box body through a magnet.

[0015] Furthermore, an oil suction port connected to the oil suction chamber is provided on the box body; a second baffle is provided in the oil suction chamber, and the second baffle is provided on the bottom plate of the box body and is located below the oil suction port.

[0016] Furthermore, the bottom plate of the box body is inclined upward from close to the water collecting device to away from the water collecting device.

[0017] Furthermore, an oil drain and return port is provided on the bottom plate of the box body, the oil drain and return port is connected to a tube body located in the box body, and an oblique oil outlet is provided at one end of the tube body away from the oil drain and return port.

[0018] A second aspect of the present invention provides a pump truck, comprising the hydraulic oil tank as described above.

[0019] Furthermore, the box body is provided with a mounting member capable of mounting the hydraulic oil tank on the pump truck, and the mounting member is provided with a mounting hole.

[0020] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] The provision of the oil return hood described in the present invention increases the turbulent flow path of the oil and is beneficial to the escape of bubbles in the oil, which can effectively reduce the bubbles in the oil; at the same time, since water exists in the oil in a free state, the density of water is greater than that of hydraulic oil, and it will slowly settle to the bottom of the oil tank, enter the water collecting device, and then be discharged from the water collecting device, thereby reducing the water content in the hydraulic oil, improving the oil quality, extending the service life of hydraulic components, and improving the reliability of the hydraulic system.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention.

[0024] In the attached picture:

[0025] Figure 1 It is a structural schematic diagram of the hydraulic oil tank of the present invention;

[0026] Figure 2 It is a schematic diagram of the internal structure of the hydraulic oil tank of the present invention;

[0027] Figure 3 The structure of the oil return cover of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 4 The structure of the oil return cover of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 5 The structure of the bottom plate of the hydraulic oil tank of the present invention is shown in FIG. Figure 1 ;

[0030] Figure 6 The structure of the bottom plate of the hydraulic oil tank of the present invention is shown in FIG. Figure 2 ;

[0031] Figure 7 The structure of the bottom plate of the hydraulic oil tank of the present invention is shown in FIG. Figure 3 .

[0032] Description of reference numerals:

[0033] 1. Box body; 11. Top plate; 111. Air filter installation port; 112. Backflow filter port; 113. Blocking port; 12. Bottom plate; 121. Main pump oil drain return port; 122. Auxiliary oil drain return port; 13. Side plate; 131. Main valve group oil return port;

[0034] 2. Oil return cover; 21. First plate; 22. Second plate; 221. Water hole; 23. Third plate; 24. Grille hole;

[0035] 3. Oil return box;

[0036] 4. Water collection device; 41. Drainage outlet;

[0037] 5. a first baffle; 51. a magnet;

[0038] 6. Second baffle;

[0039] 7. Pipe body; 71. Oil outlet;

[0040] 8. first mounting plate; 81. first mounting hole;

[0041] 9. Second mounting plate; 91. Second mounting hole. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0043] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0044] like Figure 1-Figure 7 As shown, the present invention discloses a hydraulic oil tank, which includes a box body 1. An oil return hood 2 with grille holes 24 is arranged in the box body 1, and the oil return hood 2 divides the inner cavity of the box body 1 into an oil return chamber and an oil suction chamber connected to the oil return chamber; a reflux filter port 112 connected to the oil return chamber is arranged on the box body 1, and a water collecting device 4 is arranged at the bottom of the box body 1.

[0045] In the above technical solution, the oil containing water enters the oil return chamber from the reflux filter port 112, and the oil in the oil return chamber enters the oil suction chamber after passing through the grille hole 24 on the oil return cover 2. The setting of the oil return cover 2 increases the turbulent flow path of the oil, and is conducive to the escape of bubbles in the oil, which can effectively reduce the bubbles in the oil from entering the oil suction chamber; at the same time, since water exists in the oil in a free state, the density of water is greater than that of hydraulic oil, and the water will slowly settle to the bottom of the oil tank, and then enter the water collection device 4, and be discharged from the water collection device 4, effectively reducing the water content in the hydraulic oil, improving the oil quality, extending the service life of hydraulic components, and improving the reliability of the hydraulic system.

[0046] In one embodiment of the present invention, the oil return hood 2 is independently arranged in the housing 1. That is, the inner cavity of the oil return hood 2 constitutes the oil return chamber, and the outer wall of the oil return hood 2 and the inner wall of the housing 1 form the oil suction chamber.

[0047] In another preferred embodiment of the present invention, Figure 2-Figure 4 As shown, the edge of the oil return hood 2 is connected to the inner wall of the box body 1, the inner wall of the oil return hood 2 and the inner wall of the box body 1 form the oil return chamber, and the outer wall of the oil return hood 2 and the inner wall of the box body 1 form the oil suction chamber.

[0048] Specifically, the oil return cover 2 has a first plate 21 disposed opposite to the bottom plate 12 of the box body 1, and the first plate 21 is disposed in an inclined manner. The inclined arrangement mentioned here means that there is an angle c between the first plate 21 and the horizontal plane, and the angle c is generally 1-6 degrees.

[0049] The oil return hood 2 also has a second plate 22 disposed on the bottom plate 12 of the box body 1 and capable of supporting the first plate 21. Further, the oil return hood 2 also has a third plate 23 disposed between the bottom plate 12 of the box body 1 and the first plate 21, the top of the third plate 23 is connected to the side of the second plate 22, and the side of the third plate 23 is connected to the side of the second plate 22.

[0050] In the above technical solution, the grille holes 24 are provided on the first plate body 21, and the grille holes 24 are provided on the upper part of the second plate body 22. No grille holes are provided on the third plate body 23. That is to say, the grille holes 24 are distributed on the upper part of the second plate body 22 and the first plate body 21, and the inclination angle c of the first plate body 21 to the horizontal plane is generally 1-6 degrees. The grille holes 24 are provided at a higher position, which can increase the turbulent flow path of the oil inside the oil tank, and the oil flows upward from the grille holes 24, so that the oil can have a longer flow path in the oil tank, and the oil is fully exchanged, which is convenient for bubbles to flow upward along the oil; at the same time, it is conducive to the water to settle downward under the action of gravity, enter the water collecting device 4, and be discharged by the water collecting device 4.

[0051] In addition, a water hole 221 is provided on the second plate body 22, and the water hole 221 is provided on a side of the second plate body 22 close to the bottom plate 12 of the box body 1. Preferably, the water hole 221 is a notch opened on the bottom edge of the second plate body 22. The water hole 221 is provided on the second plate body 22 to ensure that the water in the oil return chamber flows from the oil return chamber to the oil suction chamber and flows into the water collecting device 4.

[0052] Furthermore, the grille holes 24 are elongated holes, and the edges of the elongated holes are wavy. Preferably, there may be a plurality of elongated holes, which are arranged at intervals on the first plate body 21 and the second plate body 22 .

[0053] In the above technical solution, the arrangement of multiple long holes can effectively ensure the flow of the fluid, which is beneficial for the oil inside the oil return chamber to flow out of the oil return chamber in a laminar manner, reduce the flow rate of the oil, reduce the vortex and turbulence of the oil, and facilitate the precipitation of bubbles in the oil.

[0054] Furthermore, the housing 1 is provided with a main valve group oil return port 131 , and the oil return chamber is provided with an oil return box 3 which is covered on the main valve group oil return port 131 and communicated with the oil return chamber.

[0055] The oil return chamber has a plurality of valve group oil return ports, and the plurality of valve group oil return ports are not directly facing the grille hole 24. Among them, an oil return box 3 is added for the main valve group oil return port 131 with relatively large instantaneous impact to reduce the oil flow speed, change the flow direction of the oil, and prevent the oil in the oil tank from being stirred.

[0056] The oil return box 3 is provided with an opening connected to the oil return chamber. The opening of the oil return box 3 faces the side wall of the box body 1, so that the oil returned through the main valve group oil return port 131 is first buffered by the oil return box 3, and then enters the oil suction chamber through the grille hole 24 on the oil return cover 2.

[0057] like Figure 2 , Figure 5-Figure 6 As shown, in one embodiment of the present invention, a through hole is provided on the bottom plate 12 of the box body 1, and the water collecting device 4 includes a water collecting box arranged on the outer wall of the bottom plate 12 and connected to the through hole, and a drain outlet 41 is provided on the water collecting box.

[0058] The water collecting device 4 is used to collect the water separated from the oil, and then discharge the water through the drain port 41 to prevent the water from re-entering the circulation system. In addition, the water collecting box is arranged at the bottom of the oil suction chamber to prevent the water in the water collecting box from re-entering the oil tank due to the oil return process.

[0059] like Figure 7 As shown, in another embodiment of the present invention, the water collecting device 4 comprises a sink formed by the bottom plate 12 of the box body 1 being recessed downward, and a drain port 41 is provided on the sink.

[0060] This embodiment is another structure of the water collecting device 4 , and the water collecting device 4 is a sink formed by the bottom plate 12 being recessed downwards, that is, the water collecting device 4 in this embodiment is integrally formed with the bottom plate 12 .

[0061] Whether the water collecting device 4 is a water collecting box or a sink, it is to ensure that the free water in the oil can be better collected under the action of gravity and then discharged from the box 1. In addition, a drain valve can be provided at the drain port 41 to control the opening and closing of the drain port 41.

[0062] In order to ensure that the water in the water collection box or the trough will not be re-involved in the oil during operation of the oil tank, and to ensure the purity of the drainage, the present invention further comprises a first baffle 5 detachably mounted in the oil suction chamber and covering the water inlet of the water collection device 4, through which the water separated from the oil can enter the water collection device 4. Preferably, the first baffle 5 can be a herringbone baffle, a cross-shaped baffle, or a grid-shaped baffle.

[0063] For example, the first baffle plate 5 is arranged at the water inlet of the water collecting device 4 by means of a magnet 51, that is, the first baffle plate 5 is detachably arranged on the bottom plate 12 by means of the magnet 51. This arrangement facilitates the removal of the first baffle plate 5 during the oil change process of the oil tank, and the lower area of ​​the first baffle plate 5 and the water collecting device 4 are thoroughly cleaned.

[0064] Furthermore, the box body 1 is also provided with an oil suction port connected to the oil suction chamber; the oil suction chamber is provided with a second baffle 6, which is provided on the bottom plate 12 of the box body 1 and is located below the oil suction port. The provision of the second baffle 6 can prevent the oil from disturbing the water inside the water collecting device 4 during the water discharge process.

[0065] like Figure 5-Figure 6 As shown, in order to facilitate the water and impurities in the oil to gather in the water collecting device 4 and then be discharged through the drain port 41, the bottom plate 12 is inclined upward from close to the water collecting device 4 to away from the water collecting device 4, that is, the water collecting device 4 is arranged at the lowest point of the bottom plate 12.

[0066] For example, the bottom plate 12 is a rectangular plate, and the water collecting device 4 is arranged at a corner of the rectangular plate. In the length direction of the rectangular plate, the bottom plate 12 gradually tilts upward from close to the water collecting device 4 to away from the water collecting device 4. Generally, the angle b between the rectangular plate and the horizontal plane in the length direction is 0-8 degrees. In the width direction of the rectangular plate, the bottom plate 12 gradually tilts upward from close to the water collecting device 4 to away from the water collecting device 4. Generally, the angle a between the rectangular plate and the horizontal plane in the width direction is 0-8 degrees. This arrangement enables the water collecting device 4 to be arranged at the lowest point of the bottom plate 12, which is conducive to the accumulation of water and impurities in the oil, and then discharged through the drain port 41.

[0067] Furthermore, an oil drain port is provided on the bottom plate 12 of the box 1. The oil drain port is connected to a tube 7 located in the box 1, and an oblique oil outlet 71 is provided at one end of the tube 7 away from the oil drain port.

[0068] Specifically, the oil leakage return port includes a main pump oil leakage return port 121 and an auxiliary oil leakage return port 122. The pipe body 7 is connected to the main pump oil leakage return port 121 and the auxiliary oil leakage return port 122, so that the main pump oil leakage return port 121 and the auxiliary oil leakage return port 122 are higher than the bottom plate 12 by a certain height, and the height mentioned here is generally 10-30mm. In this way, if there is a water film at the bottom of the oil tank, the water will not be driven up and circulated in the oil tank because the main pump oil leakage return port 121 and the auxiliary oil leakage return port 122 are too low.

[0069] At the same time, an oblique oil outlet 71 is provided at one end of the tube body 7 away from the main pump oil return port 121. The oil outlet 71 is a 45-degree oblique cut, which can increase the cross-sectional area of ​​the oil outlet 71 and reduce the flow rate of the oil flowing out of the oil outlet 71.

[0070] In order to further ensure that the oil entering the oil tank does not contain moisture, a filter with a water absorption function can be installed at the reflux filter port 112 of the oil tank to prevent moisture from entering the oil tank. Furthermore, an air filter installation port 111 is provided on the top plate 11 of the box body 1, and an air filter element adapted to the air filter installation port 111 is arranged in the air filter installation port 111. The air filter element here can be an air filter element with a desiccant, which can better prevent moisture from entering the oil.

[0071] In addition, a sealing port 113 is provided on the top plate 11 of the box body 1 of the present invention, and a plug matching the sealing port 113 is provided in the sealing port 113 to facilitate replacement of the oil in the oil tank.

[0072] The hydraulic oil tank of the present invention allows oil to flow in and out of the oil tank, supporting the alternating advancement of the pumping cylinders, so that concrete can be continuously pushed out of the concrete cylinders and pumped to a specific construction location.

[0073] The hydraulic oil tank has two typical working conditions, namely, pumping condition and non-pumping condition. In the non-pumping condition, the stirring mechanism is mainly in operation, and the flow rate is relatively small at this time, and the oil flows into the oil tank from the main pump oil drain return port 121 and the auxiliary oil drain return port 122. At this time, the swing cylinder will not work, and there will be no oil return at the oil return box 3.

[0074] Under the pumping condition, when the pumping cylinder pushes the concrete cylinder to reciprocate, because the pumping system is an open or closed system, all or part of the oil in the hydraulic system flows back to the hydraulic oil tank for oil exchange. Most of the oil in the hydraulic system passes through the condenser and enters the oil return chamber through the reflux filter port 112. After circulating in the oil return chamber through the oil return cover 2, it flows out from the oil suction port of the oil suction chamber.

[0075] Among them, when the pumping cylinder is ready to change direction at the extreme position, in order to ensure continuous concrete pumping, the swing cylinder pushes the S tube to change direction, which will produce a large impact (instantaneous large flow). Therefore, an oil return box 3 is added at the oil return port 131 of the main valve group to change the flow direction of the oil and reduce the flow rate of the oil, so that the oil passes through the oil return box 3 and then through the oil return cover 2 into the oil suction chamber, and then flows out from the oil suction port. In addition, some of the oil returns to the oil tank through the main pump oil drain return port 121 at the bottom of the oil tank; and some of the oil returns to the oil tank through the auxiliary oil drain return port 122 on the bottom wall or side wall of the oil tank.

[0076] During the pumping process of the pumping oil tank, the concrete cylinder reciprocates to push the concrete to be transported, and the water in the cooling water tank of the concrete cylinder penetrates into the cylinder side through the piston rod sealing ring and enters the hydraulic system. The oil containing water enters the oil return chamber through the reflux filter port 112, and part of the oil enters the oil return box 3 from the main valve group oil return port 131 and then enters the oil return chamber. Another part of the oil enters the oil return chamber through the main pump oil drain return port 121. In addition, due to the small flow rate, some of the oil directly enters the oil suction chamber from the auxiliary oil drain return port 122. The oil in the oil return chamber enters the oil suction chamber through the grille hole 24 on the oil return cover 2. The setting of the oil return cover 2 increases the turbulent flow path of the oil and is conducive to the escape of bubbles in the oil, which can effectively reduce the bubbles in the oil from entering the oil suction chamber. At the same time, since the density of water is greater than that of hydraulic oil, the water is in the oil as free water. Due to its high density, it will slowly settle to the bottom of the oil tank. The bottom plate 12 of the oil tank is inclined. Water slowly gathers in the water collection device 4 due to gravity. The water in the oil tank is discharged by the operator regularly draining the water. At the same time, by placing the first baffle 5 and the second baffle 6 at the water inlet of the water collection device 4, the water in the water collection device 4 is prevented from being re-involved in the oil, effectively reducing the water content in the oil.

[0077] The present invention also discloses a pump truck, which uses the hydraulic oil tank as described above, wherein the tank body 1 is provided with a mounting member capable of mounting the hydraulic oil tank on the pump truck, and the mounting member is provided with a mounting hole.

[0078] Furthermore, the mounting member includes a first mounting plate 8 which is arranged on the outside of the box body 1 and is integrally formed with the side panel 13 of the box body 1. The first mounting plate 8 is provided with a plurality of strip-shaped first mounting holes 81, and the oil tank is fixed to the pump truck mount by bolts. The strip-shaped first mounting holes 81 reduce the assembly accuracy of the oil tank and the pump truck mount, ensure that the same oil tank structure can adapt to different pump truck mounts, ensure the installation fixing points on the side of the oil tank, and improve the stability of the oil tank installation.

[0079] Furthermore, the mounting member further comprises a second mounting plate 9 arranged at the bottom of the box body 1, and a second strip-shaped mounting hole 91 is arranged on the second mounting plate 9. The second mounting plate 9 is generally used to mount the pumping oil tank on the side bracket of the sub-frame beam.

[0080] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A hydraulic oil tank, characterized in that: The invention comprises a box body (1), wherein an oil return cover (2) having grille holes (24) is arranged inside the box body (1), and the oil return cover (2) divides the inner cavity of the box body (1) into an oil return chamber and an oil suction chamber connected to the oil return chamber; the box body (1) is provided with a reflux filter port (112) connected to the oil return chamber, and a water collecting device (4) is arranged at the bottom of the box body (1); The oil return cover (2) comprises a first plate body (21) arranged opposite to the bottom plate (12) of the box body (1), the first plate body (21) being arranged in an inclined manner, and the grille hole (24) being arranged at an inclined high position of the first plate body (21); The oil return cover (2) comprises a second plate body (22) which is arranged on a bottom plate (12) of the box body (1) and is capable of supporting the first plate body (21), and the grille hole (24) is arranged on a side of the second plate body (22) away from the bottom of the box body (1).

2. The hydraulic oil tank according to claim 1, characterized in that: The edge of the oil return hood (2) is connected to the inner wall of the box body (1), the inner wall of the oil return hood (2) and the inner wall of the box body (1) form the oil return chamber, and the outer wall of the oil return hood (2) and the inner wall of the box body (1) form the oil suction chamber.

3. The hydraulic oil tank according to claim 1, characterized in that: A water hole (221) is provided on a side of the second plate (22) close to the bottom plate (12) of the box body (1).

4. The hydraulic oil tank according to claim 1, characterized in that: The oil return cover (2) further comprises a third plate body (23) arranged between the bottom plate (12) of the box body (1) and the first plate body (21), and the side edge of the third plate body (23) is connected to the side edge of the second plate body (22).

5. The hydraulic oil tank according to claim 1, characterized in that: The box body (1) is provided with a main valve group oil return port (131), and the oil return chamber is provided with an oil return box (3) which is covered on the main valve group oil return port (131) and connected to the oil return chamber.

6. The hydraulic oil tank according to claim 1, characterized in that: A through hole is provided on the bottom plate (12) of the box body (1), and the water collection device (4) comprises a water collection box arranged on the outer wall of the bottom plate (12) of the box body (1) and connected to the through hole, and a drainage outlet (41) is provided on the water collection box; or, the water collection device (4) comprises a trough formed by a downward depression of the bottom plate (12) of the box body (1), and the drainage outlet (41) is provided on the trough.

7. The hydraulic oil tank according to any one of claims 1 to 6, characterized in that: It also comprises a first baffle (5) which is detachably installed in the oil suction chamber and covers the water inlet of the water collecting device (4), and the water separated from the oil can enter the water collecting device (4) through the first baffle (5).

8. The hydraulic oil tank according to claim 7, characterized in that: The first baffle (5) is arranged on the bottom plate (12) of the box body (1) via a magnet (51).

9. The hydraulic oil tank according to claim 1, characterized in that: The box body (1) is provided with an oil suction port connected to the oil suction chamber; the oil suction chamber is provided with a second baffle (6), and the second baffle (6) is arranged on the bottom plate (12) of the box body (1) and is located below the oil suction port.

10. The hydraulic oil tank according to claim 1, characterized in that: The bottom plate (12) of the box body (1) is inclined upward from a direction close to the water collecting device (4) to a direction away from the water collecting device (4).

11. The hydraulic oil tank according to claim 1, characterized in that: An oil drain and return port is provided on the bottom plate (12) of the box body (1), the oil drain and return port is connected to a pipe body (7) located in the box body (1), and an oblique oil outlet (71) is provided at one end of the pipe body (7) away from the oil drain and return port.

12. A pump truck, characterized in that: A hydraulic oil tank as described in any one of claims 1 to 11 is used.

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