A hydraulic pipeline cleaning method based on a flush valve block with adjustable liquid flow direction

Abstract

The application provides a hydraulic pipeline cleaning method based on a flushing valve block and adjustable liquid flow direction, a flushing pipeline hydraulic schematic diagram is created based on a hydraulic system hydraulic schematic diagram, a power unit in the hydraulic system is replaced by a cleaning device on an actual vehicle, an integrated valve is replaced by a corresponding flushing valve block, and it is ensured that all hydraulic pipelines after replacement can be communicated; the cleaning device supplies oil to the flushing pipeline hydraulic system, and the oil flows through the pipeline in the adjusted direction, so that each pipeline can be cleaned. The application can make the oil flow through the pipeline in the adjusted direction, ensure that each pipeline can be cleaned, is efficient and safe, and does not damage the valve body.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and more specifically to a hydraulic pipeline cleaning method based on a flushing valve block with adjustable fluid flow direction. Background Technology

[0002] In multi-wheeled and multi-axle vehicles such as engineering vehicles and special vehicles, the hydraulic system is an indispensable core component. Due to the complex vehicle structure and numerous actuators, hydraulic pipelines are often densely arranged, intersecting, and have many branches, making the pipeline system exceptionally complex. During the fabrication of hydraulic pipelines, each pipeline typically requires pressure testing and internal cleaning to ensure there are no leaks and that the inner walls are clean and free of residual impurities. However, this is not sufficient to guarantee the long-term reliable operation of the hydraulic system after installation. This is because during the on-site assembly of the vehicle's hydraulic system, factors such as inadequate sealing of pipe joints, improper connection operations, and the entry of dust from the external environment can introduce new impurities into the pipeline. These impurities flow with the hydraulic fluid during operation, easily leading to hydraulic lock leaks, valve core jamming, and valve ports failing to open and close properly, which can cause hydraulic system malfunctions or even complete failure.

[0003] To address the aforementioned issues, the commonly used approach is to perform a comprehensive system flushing after all hydraulic lines and connectors are connected. This involves controlling the energization and de-energization of the solenoid valves in the hydraulic system to sequentially open the corresponding oil circuits. The pressurized oil circulates within the system, flushing away impurities from the lines and carrying them back to the oil tank, thus completing the cleaning process. However, this flushing method has the following significant drawbacks: First, during the flushing process, the hydraulic system is in a fully assembled state, and all integrated valves in the system participate in the oil circulation. Impurities flushed down from the pipeline are prone to getting stuck when flowing through the tiny gap between the valve core and valve sleeve of the integrated valve, and cannot be carried out. Instead, they cause secondary contamination to the valve body, or even directly damage the critical working surfaces of the integrated valve.

[0004] Secondly, this flushing method requires a specially designed and connected cable control system to achieve sequential control of each solenoid valve, thereby completing the switching and flushing of different oil circuits, which increases the complexity and cost of on-site operation.

[0005] Most importantly, the fundamental drawback of the aforementioned flushing method is that it cannot effectively guarantee the complete removal of impurities from the hydraulic system. Instead, it significantly increases the risk of impurities remaining and damaging the integrated valve, creating a fundamental contradiction between flushing effectiveness and system safety. Therefore, it is necessary to develop a method for efficiently and safely flushing hydraulic pipelines. Summary of the Invention

[0006] In view of this, the present invention provides a hydraulic pipeline cleaning method with adjustable fluid flow direction based on flushing valve block, which enables the oil to flow through the pipeline in the adjusted direction, ensuring that each pipeline can be cleaned, which is efficient, safe and does not damage the valve body.

[0007] The technical solution adopted in this invention is as follows: A hydraulic pipeline cleaning method based on a flushing valve block with adjustable fluid flow direction is disclosed. The method involves creating a flushing pipeline hydraulic schematic based on the hydraulic system schematic. On a real vehicle, the power unit in the hydraulic system is replaced with a cleaning device, and the integrated valve is replaced with a corresponding flushing valve block, ensuring that all hydraulic pipelines are connected after the replacement. The cleaning device supplies oil to the flushing pipeline hydraulic system, and the oil flows through the pipeline in the adjusted direction, ensuring that each pipeline is cleaned.

[0008] Furthermore, the flushing valve block has the same installation dimensions and external pipeline oil circuit interface as the integrated valve; the flushing valve block's diameter is not less than the external pipeline oil circuit diameter.

[0009] Furthermore, the hydraulic system pipelines are divided according to the functional modules of the hydraulic system, differentiating the pipelines of different functional modules, and a shut-off valve is installed on each functional module pipeline.

[0010] Furthermore, a shut-off valve is installed on the flushing valve block.

[0011] Furthermore, the shut-off valve uses a plug, and the oil flows in the required direction by screwing in or out the corresponding plug.

[0012] Furthermore, the nominal diameter of the plug is larger than the oil passage diameter.

[0013] Beneficial effects: 1. To solve the problem of cleaning the hydraulic system after assembly on a real vehicle, this invention completely follows the connection method of the actual vehicle's pipelines and valve blocks. The flushing valve block is simplified and designed based on the actual integrated valve. This flushing valve block retains all the oil ports on the integrated valve that are connected to the hydraulic pipelines, ensuring that it can be connected to all relevant hydraulic pipelines. At the same time, the interface of the cartridge solenoid valve is removed. The oil flows through each pipeline according to the set pipeline flow direction, flushing impurities through the flushing valve block, thereby avoiding secondary pollution of the integrated valve by impurities in the pipeline, which is highly efficient and safe.

[0014] 2. The flushing valve block diameter of this invention is not less than the external pipeline oil circuit diameter, so impurities and particles in the hydraulic pipeline can be flushed away more easily.

[0015] 3. This invention controls the opening and closing of the internal oil passages by using the screw plug in the flushing valve block, thereby precisely controlling the flow direction of the oil and effectively cleaning pipelines in groups. Attached Figure Description

[0016] Figure 1 This is a hydraulic schematic diagram of a hydraulic system.

[0017] Figure 2 This is a hydraulic schematic diagram of the flushing pipeline of the present invention.

[0018] Figure 3 This is a model of a hydraulic integrated valve block.

[0019] Figure 4 This is a model of the flushing valve block of the present invention.

[0020] Figure 5 This is a schematic diagram of the oil passage for the shut-off valve.

[0021] Figure 6 This is a flowchart of a method embodiment.

[0022] Among them, 1-hydraulic integrated valve, 2-oil supply and distribution integrated valve, 3-power unit, 4-flushing valve block I, 5-cleaning equipment, 6-flushing valve block II, 7-oil filter. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] This invention provides a hydraulic pipeline cleaning method with adjustable fluid flow direction based on flushing valve blocks. A hydraulic schematic diagram of the flushing pipeline is created based on the hydraulic system schematic diagram. On a real vehicle, the power unit in the hydraulic system is replaced with a cleaning device, and the integrated valve is replaced with a corresponding flushing valve block, ensuring that all hydraulic pipelines can be connected after the replacement. The cleaning device supplies oil to the hydraulic system of the flushing pipeline, and the oil flows through the pipeline in the adjusted direction to ensure that each pipeline is cleaned.

[0025] To ensure that the flushing valve block can completely replace the integrated valve, the flushing valve block is completely consistent with the actual integrated valve in terms of installation dimensions and external pipeline oil ports; the flushing valve block's diameter is not less than the external pipeline oil port diameter.

[0026] The hydraulic system pipelines are divided according to the functional modules of the hydraulic system, and different functional module pipelines are distinguished. In order to ensure that the oil flows in the set direction and avoids empty circulation in the flushing valve block without passing through the hydraulic pipeline, a shut-off valve is installed on each functional module pipeline.

[0027] In this embodiment, a shut-off valve is installed on the flushing valve block. The shut-off valve uses a screw plug; when the screw plug is screwed into the oil port, the oil passage is cut off; when the screw plug is unscrewed, the oil passage is reopened. By combining various screw plugs, the hydraulic pipeline is flushed in groups, removing impurities from the hydraulic pipeline through a cleaning cycle and preventing contamination of the integrated valve. Moreover, the nominal diameter of the screw plug is larger than the oil passage diameter, making it easier to flush away impurities and particles in the hydraulic pipeline.

[0028] The specific implementation method of the present invention will be described using a certain vehicle hydraulic system as an example, such as... Figure 6 As shown.

[0029] S1: As Figure 1 The image shows a hydraulic schematic diagram of a hydraulic system. A hydraulic schematic diagram of the flushing pipeline is then created based on this diagram. Figure 2 As shown, the power unit 2 in the hydraulic system is replaced with the cleaning device 5, and the integrated valve is replaced with the corresponding flushing valve block. The integrated valve includes the hydraulic integrated valve 1 and the oil supply distribution integrated valve 3. The corresponding flushing valve blocks are flushing valve block I 4 and flushing valve block II 6, respectively, to ensure that all hydraulic pipelines can be connected after the replacement.

[0030] S2: Based on the three-dimensional models of hydraulic integrated valve 1 and oil supply distribution integrated valve 3, design flushing valve block I 4 and flushing valve block II 6 models. On the one hand, we need to ensure that the flushing valve block and the integrated valve are completely consistent in terms of installation form and interface, and that the flushing valve block and the integrated valve can be interchanged in the actual vehicle; on the other hand, we need to ensure that the oil passage inside the flushing valve block is simple and the diameter is as large as possible to ensure that the oil can pass through smoothly.

[0031] In this embodiment, as Figure 3 As shown, the hydraulic integrated valve 1 has ports QZC, QZF, QYC, QYF, HYC, HYF, QYC, QYF, CP, and T, each of which is connected to a corresponding hydraulic pipeline; for example... Figure 4 As shown, flushing valve block I4 also has QZC, QZF, QYC, QYF, HYC, HYF, QYC, QYF, CP, and T oil ports, which are in the same positions as hydraulic integrated valve 1.

[0032] The design of flushing valve block II6 is similar to that of flushing valve block I4. It should be noted that the oil supply distribution integrated valve 3 has four oil ports: P, T, CP, and BP. Among them, the BP port is connected to the braking system and should be blocked during cleaning. Therefore, flushing valve block II6 does not need to be designed with a corresponding oil port.

[0033] S3: Design the shut-off valve on the flushing valve block according to the hydraulic schematic diagram of the flushing pipeline. The flushing valve block will have many oil channels to ensure that the oil can clean every pipeline; however, the oil may not flow in the specified direction. Figure 2 The hydraulic fluid will flow directly back in the direction of the arrow. To ensure the fluid flows in the required direction, a shut-off valve must be designed in the oil passage to cut off a certain channel when necessary, ensuring the fluid can flow to the pipeline as required for cleaning. Therefore, a shut-off valve on the flushing valve block needs to be designed based on the hydraulic schematic diagram of the flushing pipeline.

[0034] Specifically, the pipelines of the hydraulic system are distinguished according to the functional modules of the hydraulic system. In this embodiment, the pipelines for the left front spring charging and discharging function, the pipelines for the right front spring charging and discharging function, the pipelines for the left rear spring charging and discharging function, and the pipelines for the right rear spring discharging function are distinguished. Shut-off valves are installed on these four functional module pipelines and are installed on the flushing valve block.

[0035] The flushing valve block I4 is equipped with shut-off valve ports J1, J2, J3, and J4 for shut-off channels. Each shut-off valve port corresponds to a shut-off valve JZ1, JZ2, JZ3, or JZ4. In this embodiment, the shut-off valve is a plug that allows the oil passage to be opened or closed. Shut-off valves include, but are not limited to, simple structures such as plugs. Figure 5 As shown, shut-off valves JZ1, JZ2, JZ3, and JZ4 are installed into valve ports J1, J2, J3, and J4 respectively. The position of each shut-off valve is adjusted as needed to control the flow of oil. When the plug is fully tightened into the port, the corresponding oil passage is cut off; when the plug is unscrewed from the port, the corresponding oil passage is connected.

[0036] S4: Connect the flushing pipeline hydraulic system to the actual vehicle. The cleaning equipment supplies oil to the system and adjusts the flow direction by cutting off certain oil lines to clean a certain group of functional pipelines in the hydraulic system.

[0037] In this embodiment, shut-off valves JZ2, JZ3, and JZ4 are closed to ensure that the oil flows in the order of "cleaning equipment 5 → flushing valve block II 6 → oil filter 7 → flushing valve block I 4 → cleaning equipment 5" and in the direction of arrow ①. This cleans the pipelines related to the left front pneumatic spring (in the schematic diagram, the pipelines connected to the spring are represented by simple lines for simplicity; the actual pipelines are very complex). Similarly, shut-off valves JZ1, JZ3, and JZ4 ensure that the oil flows in the order of "cleaning equipment 5 → flushing valve block II 6 → oil filter 7 → flushing valve block I 4 → cleaning equipment 5" and in the direction of arrow ②, thus cleaning the pipelines related to the right front pneumatic spring, and so on. It is important to note that the shut-off valves are essential. Without them, the oil entering flushing valve block I 4 from the cleaning equipment may flow directly back to the oil tank through the least damped oil path, failing to flush every pipeline.

[0038] S5: After flushing all the functional modules of the hydraulic pipelines according to the method in S4, remove the flushing valve block I4, flushing valve block II6, and cleaning equipment 5, and replace them with hydraulic integrated valve 1, oil supply distribution integrated valve 3 and power unit 2. Connect all pipelines to the integrated valve and power unit to restore the original hydraulic system.

[0039] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulic pipeline cleaning method based on a flushing valve block with adjustable fluid flow direction, characterized in that, Based on the hydraulic system's hydraulic schematic diagram, a hydraulic schematic diagram for the flushing pipeline is created. On the actual vehicle, the power unit in the hydraulic system is replaced with a cleaning device, and the integrated valve is replaced with a corresponding flushing valve block, ensuring that all hydraulic pipelines can be connected after the replacement. The cleaning device supplies oil to the hydraulic system of the flushing pipeline, and the oil flows through the pipeline in a regulated direction to ensure that each pipeline can be cleaned.

2. The hydraulic pipeline cleaning method based on an adjustable fluid flow direction using a flushing valve block as described in claim 1, characterized in that, The flushing valve block has the same installation dimensions and external pipeline oil circuit interface as the integrated valve; the flushing valve block diameter is not less than the external pipeline oil circuit diameter.

3. The hydraulic pipeline cleaning method based on an adjustable fluid flow direction using a flushing valve block as described in claim 1 or 2, characterized in that, The hydraulic system pipelines are divided according to the functional modules of the hydraulic system, and different functional module pipelines are distinguished. A shut-off valve is installed on each functional module pipeline.

4. The hydraulic pipeline cleaning method based on an adjustable fluid flow direction using a flushing valve block as described in claim 3, characterized in that, The shut-off valve is located on the flushing valve block.

5. The hydraulic pipeline cleaning method based on an adjustable fluid flow direction using a flushing valve block as described in claim 4, characterized in that, The shut-off valve uses a screw plug, which ensures that the oil flows in the required direction by screwing in or out the corresponding plug screw.

6. The hydraulic pipeline cleaning method based on an adjustable fluid flow direction using a flushing valve block as described in claim 5, characterized in that, The nominal diameter of the plug is larger than the oil passage diameter.

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