Hydraulic oil tank of excavator

Abstract

The utility model provides an excavator hydraulic oil tank which comprises a tank body, an inclined installation plate is arranged at the upper end of the front side wall of the tank body, a cylinder is arranged in the tank body, one end of the cylinder is open, the cylinder is used for installing a filter, the open end of the cylinder is connected to the installation plate, and the axis direction of the cylinder is perpendicular to the installation plate. An avoiding hole for allowing the filter to pass through is formed in the mounting plate; an oil inlet hole is formed in the side wall of the cylinder, and an oil return pipe used for being connected to the oil inlet hole is arranged on the side wall of the box body in a penetrating mode. A threaded hole used for being in threaded fit with the lower end of the filter is formed in a bottom plate of the cylinder, and a cover plate used for pressing and limiting the upper end face of the filter is detachably arranged at the position, corresponding to the receding hole, of the mounting plate. According to the hydraulic oil tank of the excavator, the filter installation support is integrated in the tank body, the occupied space is reduced, stable limiting of the filter can be achieved, and radial jumping of the filter is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of excavators, in particular to a hydraulic oil tank for excavators. Background Art

[0002] At present, in the hydraulic system of construction machinery, the return oil circuit from the main valve to the hydraulic oil tank is usually divided into two routes, one through the hydraulic oil radiator (referred to as "oil radiator"), and the other through the one-way valve. The return oil flowing out of the oil radiator and the one-way valve merges and then flows into the hydraulic oil tank.

[0003] In the traditional excavator structure, a corresponding filter bracket is usually installed on the main frame of the excavator near the oil tank for installing the filter. The return oil of the hydraulic component is first filtered through the filter, and then the hydraulic oil coming out of the filter is introduced into the oil tank through the oil pipe to realize the oil return.

[0004] The above traditional structure requires a relatively ample installation space for the installation of the filter and the arrangement of the pipeline. As the structure of the mini excavator becomes smaller and smaller, the available space on the main frame becomes more and more compact, so the existing filter installation structure is not very suitable for compact excavators, and the hydraulic oil tank and some return oil pipeline structures need to be optimized.

[0005] For example, the patent CN218934922U discloses a return oil filter cartridge for an excavator hydraulic oil tank. Although the patent discloses a structure in which the filter is integrated in the box body, specifically, a vertically arranged return oil filter cartridge is arranged in the box body, including an upper cylinder and a lower cylinder, and the return oil filter is installed in the upper cylinder. Although this structure omits the connection structure of the filter on the outer wall, which reduces the installation space to a certain extent, this vertical installation structure cannot have other interfering structures on the top of the box body, otherwise the filter cannot be quickly replaced in the later stage, and the corresponding structure on the top of the box body needs to be removed to replace the filter, resulting in restrictions on the installation position of the box body, which is also a major difficulty for compact excavators.

[0006] In addition, it can be clearly seen from the patented structure that the top of the filter and the cover plate on the top of the box are compressed and limited by a spring. This structure has poor stability under high pressure, and the filter is prone to radial fluctuations, which not only affects the filtering effect, but also causes collision noise between the filter and the side wall of the upper cylinder. Summary of the invention

[0007] The problem solved by the utility model is to provide an excavator hydraulic oil tank in order to overcome at least one defect in the prior art, wherein a filter mounting bracket is integrated in the tank body to reduce the occupied space and to achieve stable positioning of the filter to avoid radial runout of the filter.

[0008] In order to solve the above-mentioned problems, the utility model provides a hydraulic oil tank for an excavator, which includes a box body, the upper end surface of the front side wall of the box body is lower than the top plate thereof, and the front side plate of the box body is connected and closed with the top plate by an inclined mounting plate, a cylinder with an opening at one end for mounting a filter is arranged in the box body, the open end of the cylinder is connected to the mounting plate, and the axial direction of the cylinder is perpendicular to the mounting plate, and a avoidance hole for allowing the filter to pass is arranged on the mounting plate; an oil inlet hole is arranged on the side wall of the cylinder, and an oil return pipe for connecting to the oil inlet hole is penetrated on the side wall of the box body; a threaded hole for the lower end thread of the filter to cooperate is arranged on the bottom plate of the cylinder, and a cover plate for pressing and limiting the upper end surface of the filter is detachably arranged at a position corresponding to the avoidance hole on the mounting plate.

[0009] Compared with the prior art, the hydraulic oil tank of the excavator of the utility model has the following advantages:

[0010] In the hydraulic oil tank structure of the excavator of the utility model, an inclined mounting plate is arranged on the upper front side of the box body, a cylinder for mounting the filter is connected to the inner wall of the mounting plate, and the cylinder is vertically arranged to the mounting plate, and an avoidance hole is opened on the mounting plate, and the filter is installed in the cylinder through the avoidance hole. In this structure, the filter mounting bracket (cylinder) is integrated on the inner wall of the box body, reducing external pipelines, thereby reducing pipeline leakage points; and the filter can be installed and replaced from the front side of the box body, without having to be carried out from the top of the box body, which is relatively more convenient to operate; in addition, in this structure, the lower end of the filter is fitted on the bottom plate of the cylinder by a threaded connection, and the upper end of the filter is axially compressed and limited by a cover plate, which effectively ensures the stability of the filter installation structure, and is not prone to radial fluctuations and collision noise during use.

[0011] As an improvement, a cylindrical and hollow mounting base is provided on the bottom plate of the cylinder, the mounting base is coaxially arranged with the cylinder, and an internal thread is provided on the inner hole wall at the upper end of the mounting base to form the threaded hole. In the above improved structure, the mounting base is provided on the bottom plate of the cylinder, and the threaded hole is processed on the mounting base to ensure the stability of the threaded connection of the filter.

[0012] As a further improvement, a plurality of circumferentially distributed connecting screws are preset on the mounting plate at the periphery of the avoidance hole, a plurality of mounting holes matching with the connecting screws are opened on the cover plate, and a locking nut is provided on the outer end of each connecting screw passing through the cover plate.

[0013] In a further improvement, the mounting plate is further provided with a refueling hole, and a mounting boss is provided protruding outwardly from the refueling hole, and a pre-pressure breathing valve is provided on the mounting boss. In the above improved structure, the pre-pressure breathing valve can ensure the pressure balance in the box body 1.

[0014] In a further improvement, the bottom of the oil tank is provided with an oil outlet hole, and a connecting flange is provided at the oil outlet hole. In the above improved structure, the oil outlet hole is provided at the bottom of the oil tank, which is convenient for rapid oil discharge during startup, and a corresponding connecting flange is provided at the oil outlet hole, which is convenient for rapid connection with the oil outlet pipeline.

[0015] In the above improved structure, the lower area of ​​the box body is smaller than the upper area, so that the oil pressure at the oil outlet hole in the box body is strong and the oil suction flow rate can be accelerated during startup.

[0016] In a further improvement, an oil window for observing the oil level is arranged on the side wall of the box. In the above improved structure, the oil window is arranged to facilitate real-time observation of the oil level in the box and to remind timely refueling.

[0017] Other improved features and advantages of the utility model will be described in the subsequent specific embodiments, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the hydraulic oil tank of an excavator of the utility model;

[0019] Figure 2 It is a schematic diagram of the hydraulic oil tank of the excavator of the utility model from another angle;

[0020] Figure 3 for Figure 1 Structural diagram of the hydraulic oil tank of the medium excavator after removing the top plate and left side plate;

[0021] Figure 4 It is a cross-sectional view of the hydraulic oil tank of the excavator of the utility model;

[0022] Figure 5 It is a cross-sectional view of the pre-pressure breathing valve in the utility model;

[0023] Figure 6 It is a cross-sectional view of another state of the pre-pressure breathing valve in the utility model.

[0024] Description of reference numerals:

[0025] 1. Box body; 2. Top plate; 3. Front side plate; 4. Mounting plate; 5. Cylinder; 6. Avoidance hole; 7. Oil inlet hole; 8. Oil return pipe; 9. Mounting base; 10. Cover plate; 11. Connecting screw; 12. Locking nut; 13. Oil outlet hole; 14. Connecting flange; 15. Oil window; 16. Mounting boss; 17. Cover body; 18. Valve body; 19. Pressure valve plate; 20. Pressure valve spring; 21. Overflow pipe; 22. Vacuum valve stem; 23. Vacuum valve plate; 24. Vacuum valve spring. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper end", "lower end", "side wall", "inner wall", etc. are based on the orientations 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1 , 2As shown, the utility model provides an excavator hydraulic oil tank, which includes a box body 1 for storing hydraulic oil, and a fixing bracket for connecting to the main frame of the excavator is arranged on the top plate 2 and the lower side wall of the box body 1. In addition, in this embodiment, an inclined mounting plate 4 is arranged at the upper end of the front side of the box body 1, specifically, the upper end surface of the front side wall of the box body 1 is lower than its top plate 2, and the front side plate 3 of the box body 1 and the top plate 2 are connected and closed by the mounting plate 4; a cylinder 5 for installing a filter is connected to the inner side wall of the mounting plate 4, and a avoidance hole 6 is opened on the mounting plate 4, and the filter passes through the avoidance hole 6 and is installed in the cylinder 5. In this structure, the cylinder 5 is a cylinder with an open upper end and a closed lower end. The open end of the cylinder 5 is fixed to the mounting plate 4 by welding, and a threaded through hole is opened on the bottom plate of the lower end of the cylinder 5. After the filter is installed in the cylinder 5, its lower end is spirally connected to the bottom plate of the cylinder 5. More specifically, a cylindrical and hollow mounting base 9 is provided on the bottom plate at the lower end of the cylinder 5. The mounting base 9 is coaxially arranged with the cylinder 5. An internal thread is provided on the inner hole wall at the upper end of the mounting base 9 to form a threaded hole. The filter is installed into the cylinder 5 from the avoidance hole 6 and connected in the threaded hole by screw fitting. An oil inlet hole 7 is provided on the side wall of the cylinder 5. An oil return pipe 8 for connecting to the oil inlet hole 7 is penetrated on the rear side wall of the box body 1. When the external hydraulic oil returns, it enters the cylinder 5 through the oil return pipe 8, and then flows back to the inner cavity of the box body 1 from the lower end of the inner hole of the mounting base 9 after being filtered by the filter. In the whole structure, the filter bracket is integrated on the inner arm of the box body 1 to reduce the occupied volume, so that the frame of the excavator can be made small and compact.

[0030] In this embodiment, a refueling hole 13 is provided on the mounting plate 4, and a mounting boss 16 is provided on the mounting plate 4 at the refueling hole 13, and a pre-pressurized breathing valve is provided on the mounting boss 16; Figure 5 , 6 As shown, the pre-pressure breathing valve here includes a cover body 17 clamped with the mounting boss 16, the inner end of the cover body 17 is connected to a pressure valve, the pressure valve includes a valve body 18 and a pressure valve plate 19, the upper end of the valve body 18 is movably connected to the inner end of the cover body 17, the pressure valve plate 19 is connected to the lower end of the valve body 18, and a pressure valve spring 20 is arranged between the pressure valve plate 19 and the cover body 17, the pressure valve plate 19 is used to open and close the refueling hole 13, when the pressure in the box body 1 is greater than the preset value of the pressure valve plate 19, the pressure valve plate 19 is opened, and the pressure in the box body 1 is released from the overflow pipe 21 on the side wall of the mounting boss 16, as shown in FIG. Figure 5As shown by the arrow; in addition, a T-shaped vacuum valve stem 22 is also penetrated in the valve plate, and the lower end of the vacuum valve stem 22 is connected to the vacuum valve plate 23, and a vacuum valve spring 24 is arranged between the upper end of the vacuum valve stem 22 and the upper end of the pressure valve plate 19, and an air intake channel is opened on the side wall of the valve body 18. When the pressure in the box body 1 is lower than the external pressure, the external airflow enters from the overflow pipe 21, passes through the air intake channel on the valve body 18, and enters the valve body 18, and the vacuum valve plate is opened, and the air enters the box body 1 from the position of the vacuum valve plate, as shown in FIG. Figure 6 As shown by the arrow, pressure balance is achieved. Since the oil in the box 1 fluctuates greatly when the actuator is working, surges are likely to occur. In order to reduce the surge, a pressure value is preset for the pressure valve. When the pressure value is greater than the preset value, the pressure valve exhausts and releases pressure, but it can still ensure that the oil will not spray out. In the above structure, the cover 17, the pressure valve, and the vacuum valve are an integrated component. When refueling is required, the cover 17 can be removed to expose the refueling hole 13.

[0031] In the above structure, if Figure 1 , 4 As shown, the mounting plate 4 and the top plate 2 are inclined at an angle of 45°; and the axial direction of the cylinder 5 is perpendicular to the mounting plate 4, that is, the cylinder 5 is also inserted into the oil in the oil tank at an inclined angle of 45°, to avoid splashing of oil and generating foam when returning the oil, which affects the performance of the hydraulic components.

[0032] In addition, such as Figure 3 , 4 As shown, a cover plate 10 is detachably provided at a position corresponding to the avoidance hole 6 on the mounting plate 4, which is used to press the filter to prevent the filter from being displaced. At the same time, the cover plate 10 needs to be opened first when replacing the filter. In this structure, the detachable connection of the cover plate 10 specifically means that a plurality of circumferentially distributed connecting screws 11 are preset on the outer periphery of the avoidance hole 6 on the mounting plate 4, and a plurality of mounting holes matching the connecting screws 11 are provided on the cover plate 10. During installation, the outer end of each connecting screw 11 is provided with a locking nut 12 at the part passing through the cover plate 10, and is fixed by pressing the locking nut 12 on the outer wall of the cover plate 10. Specifically, four pre-buried holes distributed in a rectangular shape are provided on the outer periphery of the avoidance hole 6 on the mounting plate 4, and one end of the four connecting screws 11 is inserted and matched in the corresponding pre-buried holes, and then welded and fixed to ensure the firmness of the connecting screws 11. In this structure, the disassembly and assembly of the cover plate 10 only requires screwing the locking nut 12, which is easy to operate and realizes the stable connection of the cover plate 10.

[0033] The bottom of the oil tank is provided with an oil outlet hole, and a connecting flange 14 is provided at the oil outlet hole to facilitate quick connection with the oil outlet pipeline. In this structure, the lower area of ​​the box body 1 is smaller than the upper area, so that the oil pressure at the oil outlet hole at the lower end is greater, which can accelerate the oil suction flow rate during startup. Figure 1, 2 As shown, the box body 1 has a larger area at the top and smaller area at the bottom, specifically referring to that the lower end of the left side wall of the box body 1 is recessed toward the right side, and the lower end of the rear side wall of the box body 1 is recessed toward the front side, so that the lower end of the box body 1 is more slender than the upper end.

[0034] like Figure 2 As shown, an oil window 15 is provided on the side wall of the box body 1 for observing the liquid level of the hydraulic oil in the box body 1 in real time.

[0035] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those 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 fall within the protection scope of the utility model.

Claims

1. A hydraulic oil tank for an excavator, comprising a tank body (1), characterized in that: The upper end surface of the front side wall of the box body (1) is lower than the top plate (2), and the front side plate (3) of the box body (1) and the top plate (2) are connected and closed by an inclined mounting plate (4). A cylinder (5) with an open end for mounting a filter is provided in the box body (1). The open end of the cylinder (5) is connected to the mounting plate (4), and the axial direction of the cylinder (5) is perpendicular to the mounting plate (4). The mounting plate (4) is provided with a hole for mounting a filter. An avoidance hole (6) is provided for the filter to pass through; an oil inlet hole (7) is provided on the side wall of the cylinder (5); an oil return pipe (8) for connecting to the oil inlet hole (7) is penetrated through the side wall of the box body (1); a threaded hole for the lower end thread of the filter to cooperate is provided on the bottom plate of the cylinder (5); a cover plate (10) for pressing and limiting the upper end surface of the filter is detachably provided at a position corresponding to the avoidance hole (6) on the mounting plate (4).

2. The hydraulic oil tank for excavators according to claim 1, characterized in that: A cylindrical and hollow mounting base (9) is arranged on the bottom plate of the cylinder (5). The mounting base (9) is coaxially arranged with the cylinder (5). An internal thread is arranged on the inner hole wall at the upper end of the mounting base (9) to form the threaded hole.

3. The hydraulic oil tank for excavators according to claim 1, characterized in that: The mounting plate (4) is provided with a plurality of circumferentially distributed connecting screws (11) at the periphery of the avoidance hole (6); the cover plate (10) is provided with a plurality of mounting holes matched with the connecting screws (11); and the outer end of each connecting screw (11) that passes through the cover plate (10) is equipped with a locking nut (12).

4. The hydraulic oil tank for an excavator according to any one of claims 1 to 3, characterized in that: The mounting plate (4) is also provided with a refueling hole (13), and a mounting boss (16) is protruding outwardly from the refueling hole (13), and a pre-pressure breathing valve is matched on the mounting boss (16).

5. The hydraulic oil tank for excavators according to claim 4, characterized in that: An oil outlet hole is arranged at the bottom of the oil tank, and a connecting flange (14) is arranged at the oil outlet hole.

6. The hydraulic oil tank for excavators according to claim 5, characterized in that: The lower area of ​​the box body (1) is smaller than the upper area.

7. The hydraulic oil tank for excavators according to claim 3, characterized in that: An oil window (15) for observing the oil level is arranged on the side wall of the box body (1).

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