A two-head busy pilot oil source integrated valve group

Abstract

The utility model relates to hydraulic valve group technical field provides a two head busy pilot oil source integrated valve group, including integrated valve block and set up first solenoid valve, check valve, second solenoid valve, third solenoid valve on integrated valve block, integrated valve block sets up oil inlet P, oil return port T, first two head busy connection oil port Pr, second two head busy connection oil port Pv, energy accumulator connection oil port, oil inlet P with check valve's input end intercommunication, check valve's output end with energy accumulator connection oil port, second solenoid valve, third solenoid valve intercommunication, energy accumulator connection oil port with energy accumulator intercommunication, second solenoid valve with oil return port T, first two head busy connection oil port Pr intercommunication, third solenoid valve with oil return port T, second two head busy connection oil port Pv, first solenoid valve intercommunication. The utility model integrates the design of multiple functional elements, improves the integrated degree and oil source supply response speed, promotes the hydraulic control performance and operation efficiency of two head busy equipment.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic valve assembly technology, and in particular to a dual-head pilot oil source integrated valve assembly. Background Technology

[0002] A backhoe loader is a multi-purpose engineering machine that integrates excavation and loading functions, widely used in construction, road maintenance, agricultural operations, and municipal engineering. This type of equipment typically uses a hydraulic control system to drive and control the working devices. To ensure operational sensitivity and equipment efficiency, modern backhoe loaders often employ pilot control technology, providing low-pressure signal oil to the control valves of each actuator via a pilot oil source, enabling remote control of the main valve.

[0003] Existing technologies, commonly used two-way busy pilot oil source systems have the following shortcomings: Firstly, the system structure is relatively complex, with major components distributed widely, occupying a large installation space, and the pipeline connections are cumbersome, posing a risk of leakage. Secondly, existing systems have poor control over the stability of the pilot oil source pressure, easily leading to pilot pressure fluctuations, affecting operator feel and equipment response speed. Furthermore, some systems lack pressure storage devices, failing to effectively cope with the demands of high-frequency, rapid switching operations.

[0004] Therefore, there is an urgent need to design a double-headed pilot oil source valve assembly that is compact, highly integrated, provides stable oil supply, and responds quickly. Utility Model Content

[0005] This utility model mainly addresses the technical problems of existing two-way busy pilot oil source systems, such as complex installation, unstable pressure, and slow response. It proposes an integrated valve group for two-way busy pilot oil source systems, which integrates multiple functional components to improve integration and oil supply response speed, thereby enhancing the hydraulic control performance and operating efficiency of the two-way busy equipment.

[0006] This utility model provides a dual-head busy pilot oil source integrated valve group, including: an integrated valve block and a first solenoid valve, a check valve, a second solenoid valve and a third solenoid valve disposed on the integrated valve block;

[0007] The integrated valve block is provided with an oil inlet P, an oil return port T, a first two-end busy connection port Pr, a second two-end busy connection port Pv, and an accumulator connection port.

[0008] The oil inlet P is connected to the input end of the check valve, and the output end of the check valve is connected to the accumulator oil port, the second solenoid valve, and the third solenoid valve.

[0009] The accumulator is connected to the oil port;

[0010] The second solenoid valve is connected to the return port T and the first two-way connecting port Pr;

[0011] The third solenoid valve is connected to the return port T, the second two-way connecting port Pv, and the first solenoid valve.

[0012] Preferably, a filter is also provided on the integrated valve block;

[0013] The filter is located on the connecting pipeline between the check valve and the second and third solenoid valves.

[0014] Preferably, the integrated valve block is provided with a pressure testing port M;

[0015] The pressure testing port M is connected to the front of the input terminals of the second and third solenoid valves.

[0016] Preferably, the integrated valve block is provided with a first auxiliary connection port Za3 and a second auxiliary connection port Zb3;

[0017] The first solenoid valve is connected to the first auxiliary tool connection port Za3 and the second auxiliary tool connection port Zb3.

[0018] Preferably, the second solenoid valve is a normally closed two-position three-way solenoid valve, and the third solenoid valve is a normally open two-position three-way solenoid valve.

[0019] This utility model provides a dual-ended busy pilot oil source integrated valve assembly, which has significant advantages in structure and performance compared to traditional pilot oil source systems:

[0020] 1. Compact structure and high integration: This utility model valve group integrates multiple functional components such as check valve, oil filter, pressure reducing valve, accumulator, and solenoid valve, which significantly reduces pipeline connections, lowers installation space requirements, and facilitates overall machine layout.

[0021] 2. Stable pilot pressure: The valve group is equipped with a pressure reducing valve and an accumulator, which can effectively absorb system pressure fluctuations, ensure the continuous stability of the pilot oil source pressure, and improve the smoothness of operation and response accuracy.

[0022] 3. Fast response speed: By optimizing the oil circuit design and integrating the layout, the oil transmission path is reduced, improving the response speed of the oil supply and meeting the operational needs of frequent switching in backhoe loaders. This enhances the hydraulic control performance and operating efficiency of backhoe loaders.

[0023] 4. Strong adaptability and good versatility: The valve group of this utility model is equipped with a check valve and an oil filter to prevent oil backflow and contaminants from entering the pilot circuit, ensuring the working safety of the entire hydraulic system and the service life of the components.

[0024] 5. Adaptable to heavy loads and harsh environments: This valve assembly is suitable for various types of double-ended busy devices, has good field adaptability, and is easy to promote and apply.

[0025] 6. Smooth braking process and high operating comfort: The valve group design simplifies the on-site pipeline, makes installation quick, and makes later maintenance more convenient, which helps to reduce the cost of equipment use and maintenance. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the dual-head busy pilot oil source integrated valve group provided by this utility model;

[0027] Figure 2 This is a hydraulic schematic diagram of the dual-head busy pilot oil source integrated valve group provided by this utility model.

[0028] Reference numerals in the attached figures: 1. Integrated valve block; 2. First solenoid valve; 3. Check valve; 4. Filter; 5. Accumulator; 6. Second solenoid valve; 7. Third solenoid valve. Detailed Implementation

[0029] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0030] like Figure 1-2 As shown in the figure, the present invention provides a dual-headed pilot oil source integrated valve group, including: an integrated valve block 1 and a first solenoid valve 2, a one-way valve 3, a second solenoid valve 6, a third solenoid valve 7, and a filter 4 disposed on the integrated valve block 1.

[0031] The integrated valve block 1 is provided with an oil inlet P, an oil return port T, a first two-way busy connection port Pr, a second two-way busy connection port Pv, an accumulator connection port, a first auxiliary connection port Za3, a second auxiliary connection port Zb3, and a pressure measuring port M.

[0032] The oil inlet P is used for oil intake. The oil return port T is connected to the oil tank and is used for oil return.

[0033] The first end-capsule oil port Pr connects to the left handle of the end-capsule and is used to supply oil to the left handle. The second end-capsule oil port Pv connects to the right handle of the end-capsule and is used to supply oil to the right handle.

[0034] The first auxiliary tool connecting oil port Za3 and the second auxiliary tool connecting oil port Zb3 are respectively connected to the auxiliary tool to supply oil to the auxiliary tool.

[0035] The pressure testing port M is connected to the front of the input terminals of the second solenoid valve 6 and the third solenoid valve 7; the pressure testing port M is connected to an external pressure gauge to detect the oil pressure input to the second solenoid valve 6 and the third solenoid valve 7.

[0036] The oil inlet P is connected to the input end of the one-way valve 3, and the output end of the one-way valve 3 is connected to the accumulator connection port, the second solenoid valve 6, and the third solenoid valve 7. The accumulator connection port is connected to the accumulator 5, which can be directly inserted into the accumulator connection port of the integrated valve block 1. The filter 4 is located on the connecting pipeline between the one-way valve 3 and the second solenoid valve 6 and the third solenoid valve 7. The input pressure oil first enters from the oil inlet P and passes through the one-way valve 3 to prevent backflow. Subsequently, the pressure oil is divided into two paths: one path enters the accumulator 5 through the accumulator connection port to store a portion of the pressure oil, providing timely compensation when the system pressure fluctuates or there is a sudden high flow rate demand; the other path enters the oil filter 4 for oil filtration to ensure the cleanliness of the incoming oil. The filtered oil is then divided into three paths: one path leads to the pressure measuring port M (normally closed), and the other two paths enter the second solenoid valve 6 and the third solenoid valve 7, respectively.

[0037] The second solenoid valve 6 is connected to the return port T and the first double-ended connection port Pr. The third solenoid valve 7 is connected to the return port T, the second double-ended connection port Pv, and the first solenoid valve 2; the first solenoid valve 2 is connected to the first auxiliary tool connection port Za3 and the second auxiliary tool connection port Zb3, and the first solenoid valve 2 is used to realize the control of the auxiliary tool cylinder.

[0038] The second solenoid valve 6 is a normally closed two-position three-way solenoid valve. When the second solenoid valve 6 is de-energized, the oil cannot pass through the second solenoid valve 6; when the second solenoid valve 6 is energized, the oil can pass through the second solenoid valve 6 smoothly.

[0039] The third solenoid valve 7 is a normally open two-position three-way solenoid valve. When the third solenoid valve 7 is de-energized, the oil can pass through the third solenoid valve 7 smoothly; when the third solenoid valve 7 is energized, the oil cannot pass through the third solenoid valve 7.

[0040] The hydraulic system in which the valve assembly is located is equipped with a return oil passage. Part of the oil flows back to the oil tank through the return oil port T, realizing oil circulation and system pressure balance, thereby ensuring a stable supply of pilot oil and normal operation of the hydraulic system.

[0041] This utility model provides a dual-headed pilot-operated integrated valve assembly. During assembly, all functional components adopt an integrated modular design and are uniformly installed on the integrated valve block 1, resulting in a compact overall structure. External hydraulic components are connected to the corresponding oil ports of the valve assembly via pipelines. Components such as the check valve 3, oil filter 4, accumulator 5, first solenoid valve 2, second solenoid valve 6, and third solenoid valve 7 are all fixed inside or on the surface of the integrated valve block 1 using insert or threaded connections, ensuring oil circuit connectivity and reliable installation. The accumulator 5 is connected to the accumulator connection port on the side of the valve assembly via a high-pressure oil pipe, facilitating maintenance and replacement. The return oil channel is directly arranged inside the integrated valve block 1 and connects to the oil tank return port. The overall layout is reasonable, effectively reducing external pipeline connections, lowering the risk of leakage, and facilitating on-site installation and subsequent maintenance.

[0042] The working process of a dual-ended busy pilot oil source integrated valve group of this utility model:

[0043] The pressurized oil supplied by the system enters the valve assembly through inlet P. Only when the pressure at inlet P exceeds the opening pressure of check valve 3 can the pressurized oil enter the subsequent oil circuit. At this time, the pressurized oil is divided into two paths: one flows to accumulator 5. When the system pressure is higher than the working pressure of accumulator 5, accumulator 5 begins to store a portion of the pressurized oil for subsequent compensation of system pressure fluctuations; the other path enters oil filter 4 for oil filtration to ensure the cleanliness of the incoming oil. After filtration, the oil is again divided into three paths: one connects to pressure testing port M (normally closed), and the other two enter the second solenoid valve 6 and the third solenoid valve 7, respectively.

[0044] The second solenoid valve 6 is connected to the return port T and the first end-effector connection port Pr. The third solenoid valve 7 is interconnected with the return port T, the second end-effector connection port Pv, and the first solenoid valve 2. The oil flow path changes depending on whether the solenoid valves are energized or de-energized. When the third solenoid valve 7 is de-energized, the oil can pass smoothly through it and is divided into two paths: one flows to the second end-effector connection port Pv, providing a pilot oil source for the right handle of the end-effector; the other flows to the first solenoid valve 2, where the electromagnets on both sides can control different actions of the auxiliary tool cylinder when energized. When the second solenoid valve 6 is de-energized, the oil cannot pass through it, and the first end-effector connection port Pr serves as the return oil path for the left handle of the end-effector.

[0045] When the third solenoid valve 7 is energized, oil cannot pass through it, and the second double-ended manhole connector Pv becomes the return port for the right handle of the double-ended manhole. At this time, the first solenoid valve 2, based on its energization status, controls the return oil portion from the second double-ended manhole connector Pv to enter the first solenoid valve 2. Unused oil continues to flow back to the return port T through the third solenoid valve 7. When the second solenoid valve 6 is energized, oil can pass smoothly through it, supplying oil to the first double-ended manhole connector Pr, thus meeting the oil supply needs of the left handle of the double-ended manhole.

[0046] In addition, when the system stops supplying oil and the oil inlet P no longer inputs pressure oil, in order to avoid control failure due to oil leakage inside the valve group, the accumulator 5 will release the stored pressure oil in time to continue to provide oil compensation to the hydraulic components inside the valve group, ensuring the continuous stability of the valve group operation and the reliability of the system operation.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dual-ended busy pilot oil source integrated valve assembly, characterized in that, include: Integrated valve block (1) and a first solenoid valve (2), a check valve (3), a second solenoid valve (6), and a third solenoid valve (7) disposed on the integrated valve block (1); The integrated valve block (1) is provided with an oil inlet P, an oil return port T, a first two-end busy connection port Pr, a second two-end busy connection port Pv, and an accumulator connection port. The oil inlet P is connected to the input end of the one-way valve (3), and the output end of the one-way valve (3) is connected to the accumulator connection port, the second solenoid valve (6), and the third solenoid valve (7). The accumulator connection port is connected to the accumulator (5); The second solenoid valve (6) is connected to the return port T and the first two-end connection port Pr; The third solenoid valve (7) is connected to the return port T, the second two-end connection port Pv, and the first solenoid valve (2).

2. The dual-head busy pilot oil source integrated valve assembly according to claim 1, characterized in that, A filter (4) is also provided on the integrated valve block (1); The filter (4) is located on the connecting pipeline between the one-way valve (3) and the second solenoid valve (6) and the third solenoid valve (7).

3. The dual-headed pilot oil source integrated valve assembly according to claim 2, characterized in that, The integrated valve block (1) is provided with a pressure measuring port M; The pressure testing port M is connected to the front of the input terminals of the second solenoid valve (6) and the third solenoid valve (7).

4. The dual-head busy pilot oil source integrated valve assembly according to claim 1, characterized in that, The integrated valve block (1) is provided with a first auxiliary connection port Za3 and a second auxiliary connection port Zb3; The first solenoid valve (2) is connected to the first auxiliary tool connection port Za3 and the second auxiliary tool connection port Zb3.

5. The dual-head busy pilot oil source integrated valve assembly according to claim 1, characterized in that, The second solenoid valve (6) is a normally closed two-position three-way solenoid valve, and the third solenoid valve (7) is a normally open two-position three-way solenoid valve.

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