High-efficiency vibration-absorbing main pump oil suction pipeline arrangement structure and excavator thereof

Abstract

This utility model belongs to the technical field of excavator fixed structure. Specifically, it discloses a high-efficiency vibration-absorbing main pump suction pipe arrangement structure and its excavator, used to connect the main pump and the hydraulic oil tank. The high-efficiency vibration-absorbing main pump suction pipe arrangement structure includes a first steel pipe, a first rubber hose, a second steel pipe, and a second rubber hose connected in sequence. The first steel pipe is connected to the main pump, and the second rubber hose is connected to the hydraulic oil tank. A shock absorber for connecting the frame is installed on the outside of the second steel pipe. The flexibility of the first and second rubber hoses and the vibration absorption performance of the shock absorber, as well as the second steel pipe supporting and fixing the entire main pump suction pipe structure, effectively buffer the strong vibrations caused by the high-speed rotation of the main pump driven by the engine and the harsh working conditions such as the excavator's crushing and hammering operations, avoid oil leakage at the connection, and improve stability.

Description

Technical Field

[0001] This utility model belongs to the technical field of excavator fixed structure, specifically relating to a high-efficiency vibration-absorbing main pump oil suction pipeline layout structure and its excavator. Background Technology

[0002] The existing main pump suction piping uses a steel pipe rigidly connected to the main pump. This steel pipe is quite long and heavy, and apart from the flange connection to the main pump suction port, there is no support at other points, resulting in significant stress at the pump-to-pipe connection. During excavator digging operations, especially during the hammering process of a breaker excavator, the machine vibrates considerably. Combined with the intense vibration generated by the engine driving the main pump at high speed, after a certain period of operation, this can lead to cracks and oil leaks at the welded joints of the steel pipe, as well as leaks at the connections between the hoses and the steel pipe. This also shortens the lifespan of other related components. Utility Model Content

[0003] To address the problems in existing technologies, a high-efficiency vibration-absorbing main pump oil suction pipe layout structure and its application in excavators are proposed. This utility model provides the following technical solution:

[0004] A high-efficiency vibration-absorbing main pump suction pipeline arrangement structure is used to connect the main pump and the hydraulic oil tank. It includes a first steel pipe, a first rubber hose, a second steel pipe and a second rubber hose connected in sequence. The first steel pipe is connected to the main pump and the second rubber hose is connected to the hydraulic oil tank. A shock absorber for connecting the vehicle frame is installed on the outside of the second steel pipe.

[0005] Preferably, the shock absorber is an air spring shock absorber.

[0006] Preferably, the shock absorber includes a connecting plate for connecting the second steel pipe and a base plate for connecting the vehicle frame. A compressed air chamber and a support column are fixedly connected to the base plate. The support column is disposed inside the compressed air chamber. An air valve is connected to the compressed air chamber. A rubber cover is sealed to the upper side of the compressed air chamber and is fixedly connected to the connecting plate.

[0007] Preferably, a support plate is embedded in the rubber cover.

[0008] Preferably, a third steel pipe is connected between the second hose and the hydraulic oil tank, and an oil tank flange is connected to the hydraulic oil tank. The third steel pipe is connected to the hydraulic oil tank through the oil tank flange.

[0009] Preferably, a support base is fixedly connected to the lower side of the second steel pipe, and the shock absorber is connected to the second steel pipe through the support base.

[0010] Preferably, the cross-section of the support base is U-shaped, and a positioning groove is provided in the middle of the upper end of the support base, which is in contact with the surface of the second steel pipe.

[0011] Preferably, the shock absorber is bolted to the middle of the support base.

[0012] Preferably, the base plate is bolted to the vehicle frame.

[0013] An excavator includes the aforementioned high-efficiency vibration-absorbing main pump suction pipeline arrangement structure.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The flexibility of the first and second hoses and the vibration absorption performance of the damper can be utilized to absorb and adapt to strong vibrations, avoid oil leakage at the connection, and improve stability.

[0016] 2. The entire main pump suction pipeline structure is supported and fixed by the second steel pipe, which effectively buffers the strong vibration caused by the engine driving the main pump to rotate at high speed and the excavator performing crushing and hammering operations.

[0017] 3. By connecting the shock absorber and the second steel pipe through the support base, the pipeline load is concentrated and transferred to the shock absorber, avoiding the pipeline body from bearing additional bending moment and improving the pipeline system's resistance to vibration and loosening. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall installation structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the installation structure of the second steel pipe of this utility model;

[0020] Figure 3 This is a cross-sectional structural schematic diagram of the shock absorber of this utility model;

[0021] In the attached diagram: 1. Main pump; 2. First steel pipe; 3. First rubber hose; 4. Second steel pipe; 5. Shock absorber; 51. Connecting plate; 52. Rubber cover; 53. Compressed air chamber; 54. Base plate; 55. Valve; 56. Support plate; 57. Support column; 6. Second rubber hose; 7. Hydraulic oil tank; 71. Oil tank flange; 72. Third steel pipe; 8. Support seat. Detailed Implementation

[0022] The directional terms mentioned in the following embodiments, such as "up", "down", "left", and "right", are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the invention of this utility model.

[0023] like Figure 1-3As shown, a high-efficiency vibration-absorbing main pump suction pipeline arrangement structure is used to connect the main pump 1 and the hydraulic oil tank 7. It includes a first steel pipe 2, a first rubber hose 3, a second steel pipe 4, and a second rubber hose 6 connected in sequence. The first steel pipe 2 is connected to the main pump 1, and the second rubber hose 6 is connected to the hydraulic oil tank 7. A shock absorber 5 for connecting the vehicle frame is installed on the outside of the second steel pipe 4. The flexibility of the first rubber hose 3 and the second rubber hose 6 and the vibration absorption performance of the shock absorber, as well as the second steel pipe 4, support and fix the entire main pump 1 suction pipeline structure, effectively buffering the strong vibrations caused by the high-speed rotation of the main pump 1 driven by the engine and the harsh working conditions such as the excavator's crushing and hammering operations, avoiding oil leakage at the connection and improving stability.

[0024] Specifically, a third steel pipe 72 connects the second hose 6 and the hydraulic oil tank 7. An oil tank flange 71 is connected to the hydraulic oil tank 7. The third steel pipe 72 is connected to the hydraulic oil tank 7 via the oil tank flange 71, and the third steel pipe 72 is a 90-degree bend. The first steel pipe 2 is also a 90-degree bend, while the second steel pipe 4 is straight, resulting in an approximately U-shaped connection between the first steel pipe 2, the first hose 3, the second steel pipe 4, the second hose 6, and the third steel pipe 72. The ends of the first hose 3 and the second hose 6 are fixed using hose clamps. To improve the damping effect, the shock absorber 5 uses an air spring shock absorber.

[0025] Specifically, the shock absorber 5 includes a connecting plate 51 for connecting the second steel pipe 4 and a base plate 54 for connecting the frame. The connecting plate 51 of the shock absorber 5 is bolted to the middle of the support base 8. A compressed air chamber 53 and a support column 57 are fixedly connected to the base plate 54. A valve 55 is connected to the compressed air chamber 53 for quick on-site inflation and deflation to adjust the stiffness of the shock absorber 5. A rubber cover 52 is sealed to the upper side of the compressed air chamber 53 and is fixedly connected to the connecting plate 51 to ensure the long-term pressure-holding performance of the compressed air chamber 53. The support column 57 is located inside the compressed air chamber 53, forming a double protection mechanism, which can maintain basic load-bearing function even if the rubber cover 52 is accidentally damaged. Specifically, the base plate 54 is bolted to the frame, which is low-cost and easy to install and remove.

[0026] Specifically, the second steel pipe 4 can be arranged in two ways. The first way is that the first rubber pipe 3 and the second rubber pipe 6 are directly connected, and the second steel pipe 4 is sleeved on the outside. The second way is that the first rubber pipe 3 and the second rubber pipe 6 are indirectly connected through the second steel pipe 4. In this embodiment, the second connection method is used.

[0027] When the second steel pipe 4 is subjected to vibration, the force is transmitted to the shock absorber 5. If the vibration force is small and does not reach the operating value of the shock absorber 5, the shock absorber 5 will not operate. When the vibration force is large, the shock absorber 5 moves slowly downward under the action of the force to absorb the vibration. When the force decreases to the point of disappearing, the shock absorber 5 returns to its original position. This process repeats to achieve the effect of vibration reduction, thereby protecting the pipeline of the main pump 1's oil suction hydraulic system.

[0028] Furthermore, a support plate 56 is embedded in the rubber cover 52 to form an internal rigid structure, which significantly improves the tear resistance while ensuring the deformation capacity of the rubber body. Specifically, a steel plate is used, which can effectively restrain excessive deformation of the rubber cover 52 under vibration conditions, improve fatigue resistance, extend service life, and avoid the attenuation of shock absorption performance due to the failure of the support plate 56.

[0029] Furthermore, a support base 8 is fixedly connected to the lower side of the second steel pipe 4, and the shock absorber 5 is connected to the second steel pipe 4 through the support base 8, so as to concentrate the pipeline load to the shock absorber 5 and avoid the pipeline body from bearing additional bending moment.

[0030] Specifically, the cross-section of the support base 8 is U-shaped, and the upper middle part of the support base 8 is recessed downward to provide a positioning groove. Combined with the effect of gravity, it can form a three-dimensional constraint, effectively preventing the axial movement and circumferential rotation of the pipeline. The positioning groove contacts the second steel pipe 4, increasing the pipeline contact area and optimizing the line contact into a surface contact form. With the help of elastic gaskets, it can achieve uniform stress distribution. Especially for large-diameter steel pipes, it can eliminate local indentation defects and significantly improve the pipeline system's resistance to vibration and loosening.

[0031] Furthermore, an excavator can be obtained, including the aforementioned high-efficiency vibration-absorbing main pump oil suction pipeline arrangement structure.

[0032] In summary, this utility model effectively blocks the vibration transmission path through a multi-segment rigid-flexible alternating pipeline design. At the same time, the configured shock absorber 5 can absorb the high-frequency vibration energy of the pipeline, significantly reducing the noise radiation of the hydraulic system and suppressing the risk of pipeline fatigue fracture. It meets the extremely harsh working conditions of excavators in mining and crushing operations, and reduces the failure rate of hydraulic pipelines in the main pump 1's oil suction hydraulic system.

Claims

1. A high-efficiency vibration-absorbing main pump oil suction line arrangement structure for connecting a main pump (1) and a hydraulic oil tank (7), characterized in that, It includes a first steel pipe (2), a first rubber hose (3), a second steel pipe (4) and a second rubber hose (6) connected in sequence. The first steel pipe (2) is connected to the main pump (1), and the second rubber hose (6) is connected to the hydraulic oil tank (7). A shock absorber (5) for connecting the frame is installed on the outside of the second steel pipe (4).

2. The high-efficiency vibration-absorbing main pump oil suction line arrangement according to claim 1, characterized by, The shock absorber (5) is an air spring shock absorber.

3. The high-efficiency vibration-absorbing main pump oil suction line arrangement according to claim 1, characterized by, The shock absorber (5) includes a connecting plate (51) for connecting the second steel pipe (4) and a base plate (54) for connecting the frame. A compressed air chamber (53) and a support column (57) are fixedly connected to the base plate (54). The support column (57) is located inside the compressed air chamber (53). A valve (55) is connected to the compressed air chamber (53). A rubber cover (52) is sealed to the upper side of the compressed air chamber (53). The rubber cover (52) is fixedly connected to the connecting plate (51).

4. The high-efficiency vibration-absorbing main pump oil suction line arrangement according to claim 3, characterized by A support plate (56) is embedded in the rubber cover (52).

5. The high-efficiency vibration-absorbing main pump oil suction line arrangement according to claim 1, characterized by, A third steel pipe (72) is connected between the second hose (6) and the hydraulic oil tank (7). An oil tank flange (71) is connected to the hydraulic oil tank (7). The third steel pipe (72) is connected to the hydraulic oil tank (7) through the oil tank flange (71).

6. The high-efficiency vibration-absorbing main pump oil suction line arrangement according to claim 1, characterized by A support base (8) is fixedly connected to the lower side of the second steel pipe (4), and the shock absorber (5) is connected to the second steel pipe (4) through the support base (8).

7. The high-efficiency vibration-absorbing main pump oil suction line arrangement according to claim 6, characterized by The cross-section of the support base (8) is U-shaped, and the upper middle part of the support base (8) is recessed downward to provide a positioning groove, which is in contact with the surface of the second steel pipe (4).

8. The high-efficiency vibration-absorbing main pump oil suction line arrangement according to claim 6, characterized by The shock absorber (5) is bolted to the middle of the support base (8).

9. The high-efficiency vibration-absorbing main pump oil suction pipeline arrangement structure according to claim 3, characterized in that, The base plate (54) is bolted to the frame.

10. An excavator, characterized in that, It includes the high-efficiency vibration-absorbing main pump oil suction pipeline arrangement structure as described in any one of claims 1-9.

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