Shock absorption control hydraulic valve group for large arm suspension of loading machine

Abstract

A loader big arm suspension damping control hydraulic valve set comprises a first electromagnetic valve, a second electromagnetic valve, an energy accumulator and an overflow valve, the energy accumulator is connected with an oil inlet pipeline of a lifting oil cylinder through a pipeline, the first electromagnetic valve is installed on the pipeline between the energy accumulator and the lifting oil cylinder, and a pressure port P is formed in the pipeline between the first electromagnetic valve and the lifting oil cylinder; the energy accumulator is connected with an oil return opening T through a pipeline, an overflow valve is installed on the pipeline between the energy accumulator and the oil return opening T, and a second electromagnetic valve is installed between the connecting pipeline of the oil return opening T and the oil outlet pipeline of the lifting oil cylinder. An oil inlet pipeline and an oil outlet pipeline of the lifting oil cylinder are connected with the oil cylinder control valve. The large arm suspension shock absorption control hydraulic valve group of the loading machine is fast in response, small in occupied space and high in energy absorption efficiency, effectively relieves pressure fluctuation in an oil cavity, achieves dynamic shock absorption and stable operation of a large arm, and improves stability and comfort of the loading machine in the transportation process.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology for engineering machinery. Background Technology

[0002] In the structural design of modern loaders, improving the stability and comfort of operation under complex working conditions has become one of the important directions for optimizing overall machine performance. Because loaders frequently travel at high speeds on uneven surfaces during operation, their booms are prone to up-and-down vibrations due to inertia. This not only affects operational comfort but may also lead to premature wear of hydraulic components and mechanical structures, reducing the overall service life of the machine.

[0003] Therefore, the loader suspension system was developed. The core of the suspension system lies in absorbing the inertial impact of the working device through a hydraulic accumulator, thereby playing a role in buffering and vibration reduction. Traditional mechanical buffer structures have disadvantages such as slow response, large space occupation, and low energy absorption efficiency, and are gradually unable to meet the daily needs of loaders. Summary of the Invention

[0004] To address the aforementioned problems with traditional mechanical buffer structures in loaders, this invention provides a hydraulic valve group for shock absorption control of the loader boom suspension.

[0005] The technical solution adopted by this utility model to achieve the above-mentioned objectives is as follows: a hydraulic valve group for shock absorption control of loader boom suspension, including a first solenoid valve 3, a second solenoid valve 4, an accumulator 5, and a relief valve 2. The accumulator 5 is connected to the oil inlet pipe of the lifting cylinder 6 through a pipeline. The first solenoid valve 3 is installed on the pipeline between the accumulator 5 and the lifting cylinder 6. A pressure port P is provided on the pipeline between the first solenoid valve 3 and the lifting cylinder 6. The accumulator 5 is connected to the oil return port T through a pipeline. The relief valve 2 is installed on the pipeline between the accumulator 5 and the oil return port T. The second solenoid valve 4 is installed between the oil return port T and the oil outlet pipe of the lifting cylinder 6. The oil inlet pipe and the oil outlet pipe of the lifting cylinder 6 are connected to the cylinder control valve 7.

[0006] The pipeline between the accumulator 5 and the overflow valve 2 is provided with a pressure test port M; the pipeline between the first solenoid valve 3 and the lifting cylinder 6 is provided with a pressure test port MP.

[0007] The first solenoid valve 3, the second solenoid valve 4, the accumulator 5, and the overflow valve 2 are integrated and assembled.

[0008] The hydraulic valve group for shock absorption control of the loader boom suspension of this utility model has a fast response, small space occupation, and high energy absorption efficiency. It effectively alleviates the pressure fluctuation in the oil chamber, realizes dynamic shock absorption and stable operation of the boom, and improves the stability and comfort of the loader during transportation. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the hydraulic valve group for shock absorption control of the boom suspension of a loader.

[0010] In the diagram: 1. Valve block, 2. Relief valve, 3. First solenoid valve, 4. Second solenoid valve, 5. Accumulator, 6. Lifting cylinder, 7. Cylinder control valve. Detailed Implementation

[0011] The principle of the hydraulic valve group for loader boom suspension shock absorption control in this utility model is as follows: Figure 1 As shown, the hydraulic valve group is an integrated hydraulic valve group composed of solenoid valves, accumulators, and relief valves, used to achieve shock absorption during the operation of the loader boom. The main oil ports of the system are marked as P (pressure port), T (return port), and M, MP (pressure test ports, considered blocked when not measuring pressure), which are responsible for the oil supply, return, and pressure monitoring of the valve group, respectively. Accumulator 5 is connected to the oil inlet pipe of lifting cylinder 6 through a pipeline. A first solenoid valve 3 is installed on the pipeline between accumulator 5 and lifting cylinder 6, and a pressure port P is provided on the pipeline between the first solenoid valve 3 and lifting cylinder 6. Accumulator 5 is connected to return port T through a pipeline. A relief valve 2 is installed on the pipeline between accumulator 5 and return port T. A second solenoid valve 4 is installed between the pipeline connecting return port T and the oil outlet pipe of lifting cylinder 6. The oil inlet and outlet pipes of lifting cylinder 6 are connected to cylinder control valve 7. A pressure test port M is provided on the pipeline between the accumulator 5 and the overflow valve 2; a pressure test port MP is provided on the pipeline between the first solenoid valve 3 and the lifting cylinder 6.

[0012] ;

[0013] Working principle: (1) Normal mode: In normal working mode, the first solenoid valve 3 and the second solenoid valve 4 are de-energized and remain closed. The driver controls the cylinder control valve 7 to be energized by operating the handle, and the system begins to supply pressurized oil to the large chamber of the boom lifting cylinder 6. When the cylinder returns oil, the return oil should partially return to the oil tank through port A of the valve group, but because the first solenoid valve 3 and the second solenoid valve 4 are not energized and are in the closed state, the return oil passage is blocked, and the oil cannot flow back to the oil tank through port A. Therefore, the return oil can only enter the return oil circuit through port T of the cylinder control valve to complete the entire oil return process. This process is the normal hydraulic circuit operation mode of the loader boom in the lifting operation state.

[0014] (2) Shock Absorption Mode: In shock absorption mode, the driver does not operate the handle. The hydraulic cylinder control valve 7 is in the neutral position and de-energized. At this time, the first solenoid valve 3 and the second solenoid valve 4 are energized and open, opening the passage between the accumulator 5 and the lifting cylinder 6. When the loader lifts the material and travels on the road, due to the load, the small chamber of the lifting cylinder 6 is pushed, causing the piston rod to move towards the large chamber, which in turn causes the hydraulic oil in the large chamber to be compressed to form high pressure. At the same time, the loader is constantly impacted when traveling on uneven roads, causing the pressure in the large chamber to fluctuate.

[0015] With the first solenoid valve 3 and the second solenoid valve 4 open, high-pressure oil from the large chamber can smoothly enter the accumulator, the M port, and the P port of the relief valve 2 through the P port of the valve assembly. When the pressure has not yet reached the set value of the relief valve, some hydraulic oil is forced into the accumulator 5 for storage, thereby effectively mitigating pressure fluctuations in the oil chamber, achieving dynamic shock absorption of the boom, and improving the stability and comfort of the loader during transportation. Once the pressure in the large chamber rises to the set value of the relief valve 2, the relief valve 2 immediately opens, releasing excess pressurized oil to the return oil passage, ensuring that the system pressure is always maintained within the safe threshold, and at the same time, the amount of oil stored in the accumulator 5 also tends to stabilize and no longer changes.

[0016] As the material is unloaded, the load on the small chamber of lifting cylinder 5 gradually decreases, and the pressure in the large chamber drops accordingly. When the pressure falls below the opening value of relief valve 2, relief valve 2 automatically closes, and the hydraulic oil previously stored in accumulator 5 begins to be released and replenished into the large chamber, causing the cylinder to slowly extend and the boom to rise smoothly. During this process, since cylinder control valve 7 remains in the neutral position, the return oil from the cylinder will enter the return oil system through port A of the valve assembly, completing the entire return oil process.

Claims

1. A hydraulic valve group for shock absorption control of a loader boom suspension, characterized in that: The system includes a first solenoid valve (3), a second solenoid valve (4), an accumulator (5), and a relief valve (2). The accumulator (5) is connected to the oil inlet pipe of the lifting cylinder (6) through a pipeline. The first solenoid valve (3) is installed on the pipeline between the accumulator (5) and the lifting cylinder (6). A pressure port (P) is provided on the pipeline between the first solenoid valve (3) and the lifting cylinder (6). The accumulator (5) is connected to the oil return port (T) through a pipeline. A relief valve (2) is installed on the pipeline between the accumulator (5) and the oil return port (T). The second solenoid valve (4) is installed between the oil return port (T) connecting pipeline and the oil outlet pipe of the lifting cylinder (6). The oil inlet pipe and the oil outlet pipe of the lifting cylinder (6) are connected to the cylinder control valve (7).

2. The hydraulic valve group for shock absorption control of loader boom suspension according to claim 1, characterized in that: A pressure test port (M) is provided on the pipeline between the accumulator (5) and the overflow valve (2); a pressure test port (MP) is provided on the pipeline between the first solenoid valve (3) and the lifting cylinder (6).

3. The hydraulic valve group for shock absorption control of loader boom suspension according to claim 1, characterized in that: The first solenoid valve (3), the second solenoid valve (4), the accumulator (5) and the overflow valve (2) are integrated and assembled.

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