Upward submersible type hydraulic oil tank with oil return structure

Abstract

The utility model relates to an upward submersible type hydraulic oil tank with an oil return structure and belongs to the field of hydraulic oil tanks. According to the technical scheme, an oil outlet is formed in the lower portion of the box body, one end of the oil outlet is communicated with the interior of the box body, and the other end of the oil outlet is used for being communicated with a lower cavity of the hydraulic cylinder. The box body is provided with a first oil return pipe, one end of the first oil return pipe is communicated with the interior of the box body, and the other end of the first oil return pipe is used for being communicated with the lower cavity of the hydraulic cylinder. The box body is provided with a second oil return pipe, one end of the second oil return pipe is communicated with the interior of the box body and located above the hydraulic oil level in the box body, and the other end of the second oil return pipe is communicated with the hydraulic cylinder upper cavity. Through the arranged second oil return pipe, in the falling process of the dumper, the size of the lower cavity of the hydraulic cylinder is reduced, the size of the upper cavity of the hydraulic cylinder is increased, at the moment, air enters the second oil return pipe, and falling of the dumper is completed; the phenomenon that redundant hydraulic oil enters the upper cavity of the hydraulic cylinder from the second oil return pipe, so that the oil filling amount of a hydraulic system is too large, and hydraulic oil is wasted is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil tanks, in particular to a submersible hydraulic oil tank with an oil return structure. Background Art

[0002] Belly-lift dump trucks use engine power to drive the hydraulic lifting mechanism, tilt the cargo box to a certain angle to achieve the purpose of automatic unloading, and rely on the cargo box's own weight to reset it. Therefore, the hydraulic lifting mechanism is one of the important working systems of belly-lift dump trucks. Its form, structure, and performance directly affect the performance and safety of belly-lift dump trucks. The hydraulic oil tank is an indispensable part of the hydraulic system of belly-lift dump trucks. It is responsible for storing and supplying hydraulic oil, and also plays the role of heat dissipation, precipitation of impurities, and separation of gas from liquid.

[0003] In the hydraulic system of a belly-lift dump truck, the function of the oil tank return pipe is to guide the hydraulic oil in the upper chamber of the hydraulic cylinder back to the oil tank for reuse. The hydraulic oil tank generally uses a return oil filter to filter the hydraulic oil to prevent impurities mixed in the hydraulic oil from entering the hydraulic system and affecting the hydraulic system. One end of the return oil filter is connected to the return oil port, and the hydraulic oil in the hydraulic system circuit needs to pass through the return oil filter before entering the hydraulic oil tank.

[0004] The oil return port of the traditional hydraulic oil tank return pipe structure is usually set below the hydraulic oil level. When the dump truck is working and falling, the upper chamber of the hydraulic cylinder is under negative pressure, and the return pipe structure extracts the hydraulic oil in the hydraulic oil tank, which leads to excessive oil filling in the hydraulic system. When the hydraulic oil has the same service life, the amount of hydraulic oil used in the hydraulic oil tank at a single time increases, which increases the cost of use. Utility Model Content

[0005] The utility model aims at the problems in the prior art and provides a submersible hydraulic oil tank with an oil return structure located above the liquid surface, thereby solving the problem in the prior art that when the dump truck is working and falling, the upper chamber of the hydraulic cylinder is under negative pressure and the oil return pipe structure extracts the hydraulic oil in the hydraulic oil tank.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A submersible hydraulic oil tank with an oil return structure includes a box body, an oil outlet is arranged below the box body, one end of the oil outlet is connected to the inside of the box body, and the other end of the oil outlet is used to communicate with the lower chamber of the hydraulic cylinder. The box body is also provided with a first oil return pipe, one end of the first oil return pipe is connected to the inside of the box body, and the other end of the first oil return pipe is used to communicate with the lower chamber of the hydraulic cylinder. The box body is also provided with a second oil return pipe, one end of the second oil return pipe is connected to the inside of the box body and is located above the hydraulic oil level inside the box body, and the other end of the second oil return pipe is connected to the upper chamber of the hydraulic cylinder. Through the second oil return pipe, during the falling process of the dump truck, the volume of the lower chamber of the hydraulic cylinder decreases, and the volume of the upper chamber of the hydraulic cylinder increases. At this time, air enters the second oil return pipe to complete the falling of the dump truck. In this process, it is avoided that the excess hydraulic oil enters the upper chamber of the hydraulic cylinder through the second oil return pipe, resulting in excessive oil filling of the hydraulic system, thereby causing waste of hydraulic oil.

[0008] Preferably, one end of the oil outlet is connected to the bottom of the box. By connecting one end of the oil outlet to the bottom of the box, the hydraulic oil at the bottom of the box can flow into the hydraulic cylinder at the oil outlet to complete the movement, avoiding the waste of hydraulic oil caused by the hydraulic oil at the bottom of the box not participating in work for a long time.

[0009] Preferably, a bend joint is connected to the lower end of the oil outlet, and a locking nut is provided between the bend joint and the oil outlet. The bend joint can facilitate installation by the staff, and the locking nut can further enhance the sealing effect between the bend joint and the oil outlet.

[0010] Preferably, one end of the first oil return pipe is connected to the inside of the box through the top of the box. By setting one end of the first oil return pipe to be connected to the inside of the box through the top of the box, the installation of the first oil return pipe is facilitated.

[0011] Preferably, a valve seat is provided at the connection between the upper end of the hydraulic oil tank and the first oil return pipe, and the valve seat is used to install the overflow valve. The provided valve seat facilitates the installation of the overflow valve at the first oil return pipe.

[0012] Preferably, one end of the second oil return pipe is connected to the inside of the box through the bottom of the box. By connecting one end of the second oil return pipe to the inside of the box through the bottom of the box, the installation direction of the hydraulic hose is facilitated.

[0013] Preferably, the second oil return pipe below the box is bent. By bending the second oil return pipe below the box, it is easy for workers to install it.

[0014] Preferably, a partition is provided inside the housing, the partition divides the housing into a first oil chamber and a second oil chamber, the partition is used to filter the hydraulic oil, one end of the first oil return pipe and one end of the second oil return pipe are both provided in the first oil chamber, and the oil outlet is connected to the second oil chamber. By providing the partition, the housing can be divided into a first oil chamber and a second oil chamber, and one end of the first oil return pipe and one end of the second oil return pipe are both provided in the first oil chamber, and the oil outlet is connected to the second oil chamber. At this time, the used hydraulic oil entering the housing at the first oil return pipe and the second oil return pipe must be filtered by the partition before entering the oil outlet, thus completing the filtering of the hydraulic oil.

[0015] Preferably, filter holes are evenly arranged on the partition plate. Through the filter holes evenly arranged on the partition plate, the hydraulic oil before and after filtration can be evenly mixed to achieve a cooling effect and ensure the stable operation of the hydraulic system.

[0016] Preferably, an outer sealing plate is provided on the side end surface of the box body, and a liquid level observation window is provided on the outer sealing plate. Through the outer sealing plate and the liquid level observation window, it is convenient for the staff to understand the oil situation in the oil tank at any time, so as to replenish or replace the hydraulic oil in time.

[0017] It can be seen from the above technical scheme that the advantages of the utility model are as follows: through the second oil return pipe, during the falling process of the dump truck, the volume of the lower chamber of the hydraulic cylinder decreases, and the volume of the upper chamber of the hydraulic cylinder increases. At this time, air enters the second oil return pipe to complete the falling of the dump truck. In this process, the excess hydraulic oil is prevented from entering the upper chamber of the hydraulic cylinder through the second oil return pipe, resulting in excessive filling of the hydraulic system, thereby causing waste of hydraulic oil. By connecting one end of the oil outlet to the bottom position of the inner side of the box, it is convenient for the hydraulic oil at the bottom of the box to flow into the hydraulic cylinder at the oil outlet to complete the movement, thereby avoiding the waste of hydraulic oil caused by the hydraulic oil at the bottom of the box not participating in the work for a long time. The elbow joint is provided, which can facilitate the installation of the staff, and the locking nut is provided to further enhance the sealing effect between the elbow joint and the oil outlet. By connecting one end of the first oil return pipe to the inside of the box through the top of the box, it is convenient to install the first oil return pipe. By providing a valve seat, it is convenient to install the overflow valve at the first oil return pipe. By connecting one end of the second oil return pipe to the inside of the box through the bottom of the box, it is convenient to install the hydraulic hose. By bending the second oil return pipe under the box, it is easy for the staff to install it. The partition plate can be used to divide the interior of the box into a first oil chamber and a second oil chamber, and one end of the first oil return pipe and one end of the second oil return pipe are both set in the first oil chamber, and the oil outlet is connected to the second oil chamber. At this time, the used hydraulic oil entering the box at the first oil return pipe and the second oil return pipe must be filtered by the partition plate before entering the oil outlet, completing the filtration of the hydraulic oil. By evenly distributing the filter holes on the partition plate, the hydraulic oil before and after filtration can be evenly mixed to achieve a cooling effect and ensure the stable operation of the hydraulic system. The external sealing plate and liquid level observation window can facilitate the staff to understand the condition of the oil in the tank at any time, so as to replenish or replace the hydraulic oil in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The structure of the embodiment of the utility model is shown in FIG. Figure 1 .

[0020] Figure 2 The structure of the embodiment of the utility model is shown in FIG. Figure 2 .

[0021] Figure 3 It is a structural schematic diagram of a partition plate according to a specific implementation example of the utility model.

[0022] Description of main reference numerals

[0023] In the figure: 1. Air filter; 2. Partition plate; 3. Box body; 4. Oil outlet; 5. Locking nut; 6. Elbow joint; 7. Second oil return pipe; 8. Support plate; 9. External sealing plate; 10. Liquid level observation window; 11. Valve seat; 12. First oil return pipe; 13. Drain outlet. DETAILED DESCRIPTION

[0024] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0025] Example:

[0026] like Figure 1 and Figure 2As shown, a submersible hydraulic oil tank with oil return structure includes a box body 3, a support plate 8 is arranged at the lower end of the box body 3, and the support plate 8 is used to install the hydraulic oil tank. An oil outlet 4 is arranged below the box body 3, one end of the oil outlet 4 is connected to the inside of the box body 3, and the other end of the oil outlet 4 is used to communicate with the lower cavity of the hydraulic cylinder. The box body 3 is also provided with a first oil return pipe 12, one end of the first oil return pipe 12 is connected to the inside of the box body 3, and the other end of the first oil return pipe 12 is used to communicate with the lower cavity of the hydraulic cylinder. The box body 3 is also provided with a second oil return pipe 12. The oil pipe 7, one end of the second oil return pipe 7 is connected to the inside of the box body 3 and is located above the hydraulic oil level in the box body 3, and the other end of the second oil return pipe 7 is connected to the upper chamber of the hydraulic cylinder. In this embodiment, a partition plate 2 is provided inside the box body 3, and the partition plate 2 divides the inside of the box body 3 into a first oil chamber and a second oil chamber. The partition plate 2 is used to filter the hydraulic oil. One end of the first oil return pipe 12 and one end of the second oil return pipe 7 are both arranged in the first oil chamber, and the oil outlet 4 is connected to the second oil chamber. The top of the box body 3 is also provided with There is an air filter 1, which is arranged in this way. Through the second oil return pipe 7, when the dump truck is falling, the volume of the lower chamber of the hydraulic cylinder decreases and the volume of the upper chamber of the hydraulic cylinder increases. At this time, air enters the second oil return pipe 7 to complete the falling of the dump truck. In this process, it is avoided that the excess hydraulic oil enters the upper chamber of the hydraulic cylinder through the second oil return pipe 7, resulting in excessive oil filling of the hydraulic system, thereby causing waste of hydraulic oil. Through the partition plate 2, the interior of the box body 3 can be divided into a first oil chamber and a second oil chamber, and one end of the first oil return pipe 12 and one end of the second oil return pipe 7 are both arranged in the first oil chamber, and the oil outlet 4 is connected to the second oil chamber. At this time, the used hydraulic oil entering the box body 3 at the first oil return pipe 12 and the second oil return pipe 7 must be filtered by the partition plate 2 before entering the oil outlet 4, completing the filtration of the hydraulic oil. Through the air filter 1, the probability of the hydraulic oil being contaminated by impurities in the external air is reduced, thereby increasing the service life of the hydraulic oil.

[0027] In this embodiment, filter holes are evenly distributed on the partition plate 2, and a drain port 13 is also provided on the bottom end surface of the box body 3. In this configuration, the hydraulic oil before and after filtration can be evenly mixed through the filter holes evenly distributed on the partition plate 2, thereby achieving a cooling effect, ensuring the stable operation of the hydraulic system, and impurities in the first oil chamber can be quickly discharged through the drain port 13.

[0028] In this embodiment, one end of the oil outlet 4 is connected to the bottom position of the inner side of the box body 3. By so configuring, by connecting one end of the oil outlet 4 to the bottom position of the inner side of the box body 3, the hydraulic oil at the bottom of the box body 3 can flow out of the oil outlet 4 into the hydraulic cylinder to complete the movement, thereby avoiding the waste of hydraulic oil caused by the hydraulic oil at the bottom of the box body 3 not participating in work for a long time.

[0029] In this embodiment, a bent joint 6 is connected to the lower end of the oil outlet 4, and a locking nut 5 is arranged between the bent joint 6 and the oil outlet 4. With such an arrangement, the bent joint 6 can be easily installed by the staff, and the locking nut 5 can further enhance the sealing effect between the bent joint 6 and the oil outlet 4.

[0030] In this embodiment, one end of the first oil return pipe 12 is connected to the interior of the box body 3 through the top of the box body 3. By configuring in this way, one end of the first oil return pipe 12 is connected to the interior of the box body 3 through the top of the box body 3, which facilitates the installation of the first oil return pipe 12.

[0031] In this embodiment, a valve seat 11 is provided at the connection between the upper end of the hydraulic oil tank and the first oil return pipe 12. The valve seat 11 is used to install the overflow valve. With this arrangement, the overflow valve can be easily installed at the first oil return pipe 12 through the provided valve seat 11.

[0032] In this embodiment, one end of the second oil return pipe 7 is connected to the interior of the box body 3 through the bottom of the box body 3. This arrangement facilitates the installation direction of the hydraulic hose by connecting one end of the second oil return pipe 7 to the interior of the box body 3 through the bottom of the box body 3.

[0033] In this embodiment, the second oil return pipe 7 below the box body 3 is bent, and by bending the second oil return pipe 7 below the box body 3, it is easy for workers to install it.

[0034] like Figure 3 As shown, in this embodiment, an outer sealing plate 9 is provided on the side end face of the box body 3, and a liquid level observation window 10 is provided on the outer sealing plate 9. In this way, through the outer sealing plate 9 and the liquid level observation window 10, it is convenient for the staff to understand the situation of the oil in the tank at any time, so as to replenish or replace the hydraulic oil in time.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A submersible hydraulic oil tank with an oil return structure, comprising a tank body (3), characterized in that: An oil outlet (4) is provided below the box body (3), one end of the oil outlet (4) is connected to the inside of the box body (3), and the other end of the oil outlet (4) is used to communicate with the lower chamber of the hydraulic cylinder. The box body (3) is also provided with a first oil return pipe (12), one end of the first oil return pipe (12) is connected to the inside of the box body (3), and the other end of the first oil return pipe (12) is used to communicate with the lower chamber of the hydraulic cylinder. The box body (3) is also provided with a second oil return pipe (7), one end of the second oil return pipe (7) is connected to the inside of the box body (3) and is located above the hydraulic oil level inside the box body (3), and the other end of the second oil return pipe (7) is connected to the upper chamber of the hydraulic cylinder.

2. The submersible hydraulic oil tank with oil return structure according to claim 1 is characterized in that: One end of the oil outlet (4) is connected to the bottom of the inner side of the box body (3).

3. The submersible hydraulic oil tank with oil return structure according to claim 2 is characterized in that: The lower end of the oil outlet (4) is connected to a bent joint (6), and a locking nut (5) is provided between the bent joint (6) and the oil outlet (4).

4. The submersible hydraulic oil tank with oil return structure according to claim 1, characterized in that: One end of the first oil return pipe (12) is connected to the interior of the box body (3) through the top of the box body (3).

5. The submersible hydraulic oil tank with oil return structure according to claim 4 is characterized in that: A valve seat (11) is provided at the connection between the upper end of the hydraulic oil tank and the first oil return pipe (12), and the valve seat (11) is used to install a relief valve.

6. The submersible hydraulic oil tank with oil return structure according to claim 1, characterized in that: One end of the second oil return pipe (7) is connected to the interior of the box body (3) through the bottom of the box body (3).

7. The submersible hydraulic oil tank with oil return structure according to claim 6, characterized in that: The second oil return pipe (7) below the box body (3) is arranged in a bent manner.

8. The submersible hydraulic oil tank with oil return structure according to claim 1, characterized in that: A partition plate (2) is arranged inside the box body (3), and the partition plate (2) divides the inside of the box body (3) into a first oil chamber and a second oil chamber. The partition plate (2) is used to filter hydraulic oil. One end of the first oil return pipe (12) and one end of the second oil return pipe (7) are both arranged in the first oil chamber, and the oil outlet (4) is connected to the second oil chamber.

9. The submersible hydraulic oil tank with oil return structure according to claim 8, characterized in that: Filter holes are evenly distributed on the partition plate (2).

10. The submersible hydraulic oil tank with oil return structure according to claim 1, characterized in that: An outer sealing plate (9) is arranged on the side end surface of the box body (3), and a liquid level observation window (10) is arranged on the outer sealing plate (9).

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