High-stability integrated electro-hydraulic control reversing valve group

Abstract

The utility model discloses a high -stable integrated formula electro -hydraulic control reversing valve group belongs to electro -hydraulic control reversing valve group technical field, including the valve body, its inside is established with the main valve hole and independent pilot oil circuit for the intercommunication main oil circuit, valve body is equipped with a plurality of liquid control reversing valve, and the control assembly is provided at the top of valve body, and the control assembly includes the mounting seat and the pilot solenoid valve of installation in it, still including a plurality of shock attenuation components for non -rigid connection of control assembly and valve body, and each shock attenuation component includes the hollow column of bottom fixed in the top of valve body, and the support rod of top fixed connection with mounting seat, and lower portion slides up and down in the inner chamber of hollow column, and the elastic assembly for absorbing vibration is arranged between hollow column inner chamber bottom wall and support rod bottom wall, and the flexible communication assembly is arranged in the inside of shock attenuation component. The utility model designs a kind of electro -hydraulic control reversing valve group with stable structure, reliable connection, and with shock attenuation function.

Description

Technical Field

[0001] This utility model relates to the field of electro-hydraulic directional valve assembly technology, and in particular to a highly stable integrated electro-hydraulic directional valve assembly. Background Technology

[0002] Electro-hydraulic directional valves are a core component widely used in hydraulic systems. They typically consist of a low-power pilot solenoid valve and a high-flow hydraulic main directional valve, used to control the flow of oil in high-power hydraulic systems, thereby enabling the actuators to start, stop, and rotate in both directions.

[0003] In practical operation, the pilot solenoid valve generates strong electromagnetic shocks and high-frequency vibrations at the moment of power-on and power-off. These vibrations and shocks are directly transmitted to the entire valve body, which not only reduces the smoothness and accuracy of the main directional valve switching, but also continuously impacts the internal parts of the valve. Over time, this will accelerate the wear of precision components such as the valve core and valve body, and greatly shorten the overall service life of the electro-hydraulic directional valve.

[0004] To address this issue, several solutions have been proposed in the prior art. For example, Chinese utility model patent (authorization announcement number CN206816580U) discloses a shock-absorbing electro-hydraulic directional valve. This solution incorporates a shock-absorbing mechanism between the pilot control valve and the hydraulically controlled directional valve. This mechanism mainly consists of a support, a spring, and a groove. The spring buffers vibrations, and its pilot oil circuit is connected via a retractable "conduit-sleeve" sliding fit structure. However, this prior art solution still has the following drawbacks in practical applications:

[0005] The damping mechanism of this scheme relies solely on a single spring and support for vertical support and buffering. This structure lacks lateral guidance and limiting. When subjected to vibration and impact, the pilot control valve is prone to unstable postures such as swaying and tilting, in addition to its up-and-down movement, affecting the damping effect and the overall working accuracy of the valve group. The "conduit-sleeve" telescopic connection it adopts is essentially a dynamic sliding seal. Under high-frequency vibration conditions, continuous relative friction and wear will occur between the conduit and the sleeve. After long-term use, the sealing performance is prone to decline, posing a risk of pilot control oil leakage, thereby affecting the reliability and stability of the system. Utility Model Content

[0006] The purpose of this invention is to design an electro-hydraulic directional valve assembly that is structurally stable, reliably connected, and has shock absorption function.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a highly stable integrated electro-hydraulic directional valve assembly, comprising a valve body, which has a main valve hole for connecting the main oil circuit and an independent pilot oil circuit inside. The valve body is equipped with a plurality of hydraulic directional valves, and a control component is provided on the top of the valve body. The control component includes a mounting base and a pilot solenoid valve installed therein.

[0008] It also includes several damping components for non-rigid connection of the control components to the valve body. Each damping component includes a hollow column whose bottom is fixed to the top of the valve body, and a support rod whose top is fixed to the mounting base and whose lower part slides up and down in the cavity of the hollow column.

[0009] An elastic assembly for absorbing vibration is provided between the bottom wall of the hollow column cavity and the bottom wall of the support rod. A flexible connecting component is provided inside the shock absorption assembly to seal and connect the oil port of the pilot solenoid valve with the pilot oil circuit of the valve body.

[0010] As a further description of the above technical solution: the inner wall of the hollow column is provided with at least one slide rail, and the outer wall of the support rod is provided with a slide bar that slides in cooperation with the slide rail, so as to limit the support rod to slide only along the axial direction.

[0011] As a further description of the above technical solution: the elastic assembly includes two damping pads respectively fixed to the bottom wall of the hollow column cavity and the bottom wall of the support rod, and a spring disposed between the two damping pads.

[0012] As a further description of the above technical solution: the spring is a helical compression spring, and the shock-absorbing pad is made of elastic rubber or polyurethane material.

[0013] As a further description of the above technical solution: the flexible connection component includes a first conduit fixed to the internal channel of the support rod and connected to the pilot solenoid valve, a second conduit fixed to the internal channel of the hollow column and connected to the pilot oil circuit, and a flexible conduit whose two ends are respectively sealed and connected to the first conduit and the second conduit.

[0014] As a further description of the above technical solution: the flexible conduit passes through the inner ring of the spring along the axial direction.

[0015] As a further description of the above technical solution: multiple hydraulic directional valves are installed on the valve body, and multiple pilot solenoid valves are correspondingly installed on the mounting base of the control component. Each pilot solenoid valve is connected to the corresponding pilot oil circuit through an independent flexible connecting component to control different hydraulic directional valves respectively.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] 1. The design employs hollow columns and support rods, and features specially designed sliding tracks and strips as guiding mechanisms. This design effectively constrains the movement of the control components, solves the problem of lateral instability in the shock-absorbing structure, and thus improves the shock absorption effect and significantly enhances the operational stability of the entire valve assembly.

[0018] 2. A flexible connecting assembly consisting of a first conduit, a second conduit, and an intermediate flexible conduit is adopted. The elastic deformation of its own material compensates for vibration displacement, eliminating wear and leakage problems caused by relative motion friction. This greatly enhances the long-term reliability and sealing of the oil circuit connection and reduces maintenance costs. Attached Figure Description

[0019] Figure 1 A front view of the present invention is shown;

[0020] Figure 2 A cross-sectional view of the shock-absorbing component of this utility model is shown;

[0021] Figure 3 A perspective view of the shock-absorbing component of this utility model is shown.

[0022] 10. Valve body; 11. Hydraulic directional valve; 12. Mounting base; 13. Pilot solenoid valve; 14. Hollow column; 141. Slide rail; 15. Support rod; 151. Slide bar; 16. Shock-absorbing pad; 17. Spring; 18. First conduit; 19. Second conduit; 20. Flexible conduit. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-3 This utility model provides a technical solution: a highly stable integrated electro-hydraulic directional valve assembly, including a valve body 10 as the base. The valve body 10 is an integrated design, preferably made of high-strength alloy steel as a whole. It has a main valve hole for connecting the main oil circuit and an independent pilot oil circuit inside. The valve body 10 is provided with multiple mounting holes, channel holes and oil inlets to realize the assembly of different components and pipeline connection.

[0025] Several first hydraulic directional valves 11 are installed at designated positions on the valve body 10. These hydraulic directional valves 11 are the main components for switching high-pressure and high-flow oil circuits and are directly connected to the main oil circuit.

[0026] At the top of the valve body 10, a control component is installed. The control component is not rigidly connected to the valve body 10, but is installed through several shock-absorbing components. The control component itself includes a mounting base 12 and multiple pilot solenoid valves 13 installed inside the mounting base 12. The pilot solenoid valves 13 are connected to an external electrical control system. The number of pilot solenoid valves 13 matches the number of first hydraulic directional valves 11, and is used to generate a small flow of pilot control oil to drive the corresponding first hydraulic directional valve 11 to switch.

[0027] Each shock absorber assembly includes a hollow column 14 whose bottom is fixed to the top of the valve body 10. The hollow column 14 is preferably made of aluminum alloy or stainless steel. The hollow column 14 has a cavity inside. The lower part of a support rod 15 slides vertically in the cavity, and the top of the support rod 15 is fixedly connected to the mounting base 12 of the control assembly.

[0028] To achieve vibration reduction, an elastic assembly for absorbing vibration is provided between the bottom wall of the hollow column 14 and the bottom wall of the support rod 15. The elastic assembly includes several damping pads 16 and springs 17. Specifically, a damping pad 16 is fixedly installed on the bottom wall of the hollow column 14, and another damping pad 16 is also fixedly installed on the bottom wall of the support rod 15. A spring 17 is installed between these two opposing damping pads 16. When the pilot solenoid valve 13 vibrates during operation, the entire control assembly (mounting seat 12 and support rod 15) will move up and down slightly. The combined action of the spring 17 and the damping pad 16 can effectively absorb and buffer this vibration energy, preventing it from being directly transmitted to the valve body 10 and the main oil circuit system.

[0029] The shock-absorbing pad 16 is preferably made of high resilience materials such as nitrile rubber, fluororubber or polyurethane, which have excellent oil resistance and anti-aging properties; the spring 17 is a helical compression spring, and its preload and stiffness parameters are designed according to the working frequency and amplitude of the pilot solenoid valve 13. The function of the spring 17 is to provide energy absorption and buffer when vibration occurs, and to maintain the vertical force balance of the support rod 15 in the static state.

[0030] To further ensure the stability of the support rod 15 when sliding inside the hollow column 14 and to prevent it from shaking or rotating, several vertical slide rails 141 are provided on the inner wall of the hollow column 14. Correspondingly, several slide bars 151 that slide in cooperation with the slide rails 141 are provided on the outer wall of the support rod 15.

[0031] Because there is relative movement between the control components and the valve body 10, the connection of the pilot oil circuit must be flexible. For this reason, hollow channels are provided inside the hollow column 14 and support rod 15 of each shock-absorbing component to accommodate the flexible connecting component. The function of the flexible connecting component is to connect the outlet of the pilot solenoid valve 13 with the pilot oil circuit inside the valve body 10.

[0032] Specifically, the flexible connection assembly includes a first conduit 18 fixed in the channel of the support rod 15, the upper end of which is connected to the oil port of the pilot solenoid valve 13. It also includes a second conduit 19 fixed in the channel of the hollow column 14, the lower end of which is connected to the pilot oil circuit of the valve body 10. Between the lower end of the first conduit 18 and the upper end of the second conduit 19, a flexible conduit 20 is connected by means of clamps or threads, such as a high-pressure rubber tube or a corrugated metal tube. This flexible conduit 20 has good flexibility and can easily compensate for the small displacement of the support rod 15 relative to the hollow column 14.

[0033] For the sake of compact structure and protection, the routing path of the flexible conduit 20 is designed to pass through the inner ring of the spring 17.

[0034] The first conduit 18 and the second conduit 19 are made of high-strength nylon or stainless steel. The flexible conduit 20 is sealed to the corresponding conduit at both ends through threaded joints or quick joints. The flexible conduit 20 is a high-pressure resistant corrugated metal hose, braided reinforced rubber hose, etc. The length is reserved according to the assembly stroke to ensure the continuity of the oil circuit and the flexibility compensation capability of the support rod 15 during the up and down movement.

[0035] The working process is as follows: When an external control signal drives a pilot solenoid valve 13 to operate, it will generate high-frequency electromagnetic shock and vibration. This vibration will cause the mounting base 12 and all support rods 15 to move slightly up and down. Due to the presence of spring 17 and damping pad 16, this vibration will be effectively absorbed and attenuated, and will not be rigidly transmitted to valve body 10.

[0036] Meanwhile, the pilot control oil output by the pilot solenoid valve 13 will flow through the first conduit 18, the flexible conduit 20 and the second conduit 19 in sequence, and finally enter the pilot oil circuit of the valve body 10 to drive the corresponding first hydraulic control directional valve 11 to complete the switching. During the whole process, the flexible conduit 20 will deform slightly with vibration to ensure that the oil circuit is always unobstructed.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-stability integrated electro-hydraulic control reversing valve group, comprising a valve body (10) with a main valve hole and an independent pilot oil passage for connecting a main oil passage, characterized in that: The valve body (10) is equipped with a plurality of hydraulically controlled directional valves (11), and a control assembly is provided on the top of the valve body (10). The control assembly includes a mounting base (12) and a pilot solenoid valve (13) installed therein. It also includes several damping components for non-rigid connection of the control components to the valve body (10), each damping component including a hollow column (14) with its bottom fixed to the top of the valve body (10), and a support rod (15) with its top fixed to the mounting base (12) and its lower part sliding up and down in the cavity of the hollow column (14). An elastic assembly for absorbing vibration is provided between the bottom wall of the hollow column (14) and the bottom wall of the support rod (15). A flexible connecting component is provided inside the shock absorption assembly to seal and connect the oil port of the pilot solenoid valve (13) with the pilot oil circuit of the valve body (10).

2. The high-stability integrated electro-hydraulic control reversing valve group according to claim 1, characterized in that: The hollow column (14) has at least one slide (141) on the inner wall of the cavity, and the support rod (15) has a slide bar (151) on the outer wall that slides in cooperation with the slide (141) to limit the support rod (15) to slide only along the axial direction.

3. The high-stability integrated electro-hydraulic control commutation valve group according to claim 1, characterized in that: The elastic assembly includes two damping pads (16) fixed to the bottom wall of the hollow column (14) cavity and the bottom wall of the support rod (15) respectively, and a spring (17) disposed between the two damping pads (16).

4. The high-stability integrated electro-hydraulic control commutation valve group according to claim 3, characterized in that: The spring (17) is a helical compression spring, and the shock-absorbing pad (16) is made of elastic rubber or polyurethane material.

5. A high-stability integrated electro-hydraulic control reversing valve group according to claim 4, characterized in that: The flexible connection assembly includes a first conduit (18) fixed to the internal channel of the support rod (15) and connected to the pilot solenoid valve (13), a second conduit (19) fixed to the internal channel of the hollow column (14) and connected to the pilot oil circuit, and a flexible conduit (20) whose two ends are respectively sealed and connected to the first conduit (18) and the second conduit (19).

6. A high-stability integrated electro-hydraulic control reversing valve group according to claim 5, characterized in that: The flexible conduit (20) passes through the inner ring of the spring (17) axially.

7. The high-stability integrated electro-hydraulic control commutation valve group according to claim 1, characterized in that: Multiple hydraulic directional valves (11) are installed on the valve body (10), and multiple pilot solenoid valves (13) are correspondingly installed on the mounting base (12) of the control component. Each pilot solenoid valve (13) is connected to the corresponding pilot oil circuit through an independent flexible connecting component to control different hydraulic directional valves (11) respectively.

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