Electro-hydraulic actuator device with leak-proof structure

Abstract

The utility model provides an electro-hydraulic actuator device with a leakproof structure, which comprises an inner shell, a piston rod, a piston, a first hydraulic oil through hole, a second hydraulic oil through hole, a fixed seat and a protective plate, the fixed seat and the protective plate are both arranged in a connecting cylinder, the piston is fixedly arranged at one end of the piston rod, and the second hydraulic oil through hole is arranged at the other end of the piston rod. A protective outer shell is arranged on the outer side of the inner shell, a hollow cavity is formed between the protective outer shell and the inner shell, a plurality of reinforcing support connecting bulges are arranged in the hollow cavity, and the reinforcing support connecting bulges are uniformly distributed in the hollow cavity; a buffer block is fixedly installed at the upper end of the piston, and a threaded connecting part is fixedly arranged at the upper end of the connecting end plate and is in threaded connection with the lower end of the outer wall of the protective outer shell. According to the utility model, the vibration resistance can be enhanced by reinforcing the supporting bulges, a multi-sealing structure, the dynamic dust prevention of the protection plate and the design of the buffer block are combined, a leakage-proof system is constructed, and the reliability of equipment is improved.

Description

An electro-hydraulic actuator device with a leak-proof structure Technical Field

[0001] This utility model relates to the field of electro-hydraulic actuator technology, and in particular to an electro-hydraulic actuator device with a leak-proof structure. Background Technology

[0002] In a wide range of industrial production fields, electro-hydraulic actuators, with their precise control capabilities, have become indispensable equipment in many key processes. In the chemical industry, from the reaction process of raw materials to the separation and purification of products, precise control of various fluid parameters is essential. In the petroleum industry, from crude oil extraction to refining and processing, and then to product transportation, electro-hydraulic actuators are deeply involved throughout the entire process. The power industry also relies heavily on the precise control of electro-hydraulic actuators. Existing technology discloses a leak-proof electro-hydraulic actuator with application number 202120377021.0, including a housing and a connecting seat. The housing is a hollow structure, and a piston rod is provided on the inner side of the housing. One end of the housing is provided with an end cap, and one end of the piston rod is provided with a piston, with the other end of the piston rod penetrating the end cap. A first hydraulic oil through hole is provided on the upper side of one side of the housing, and a second hydraulic oil through hole is provided on the lower side of one side of the housing. The connecting seat is located on the lower side of the housing and is fixedly connected to the end cap by screws. A fixing plate is provided at the lower end of the connecting seat, and openings are provided on both the front and rear sides of the connecting seat. Compared to traditional electro-hydraulic actuators, this invention features a connecting seat with a detection mechanism at the lower end of the housing. This allows for the determination of the wear condition of the internal gasket without disassembling the housing, enabling timely replacement of the gasket and effectively preventing leakage caused by gasket wear. However, existing electro-hydraulic actuators suffer from problems such as easy failure of seals in multiple locations, poor vibration resistance, and limited protection, which can easily lead to hydraulic oil leakage. Therefore, we propose an electro-hydraulic actuator device with a leak-proof structure to solve these problems. Summary of the Invention

[0003] To address the shortcomings mentioned above, this utility model provides an electro-hydraulic actuator device with a leak-proof structure. This device enhances vibration resistance through reinforced support protrusions, and combines multiple sealing structures, dynamic dustproof protective plates, and buffer block design to construct a leak-proof system and improve equipment reliability.

[0004] To solve the above problems, the technical solution provided by this utility model is as follows:

[0005] An electro-hydraulic actuator device with a leak-proof structure includes an inner housing, a piston rod, a piston, a first hydraulic oil through-hole, a second hydraulic oil through-hole, a fixed base, and a protective plate. The fixed base and the protective plate are both installed inside a connecting cylinder. One end of the piston rod is fixedly fitted with a piston, and the other end of the piston rod passes through a connecting end plate and a fixed base plate. A protective outer shell is provided on the outer side of the inner housing, forming a hollow cavity between the protective outer shell and the inner housing. Multiple reinforcing support protrusions are provided within the hollow cavity, and these protrusions are evenly distributed within the hollow cavity. A buffer block is fixedly installed on the upper end of the piston, and a threaded connection portion is fixedly provided on the upper end of the connecting end plate, the threaded connection portion being threadedly connected to the lower end of the outer wall of the protective outer shell.

[0006] Furthermore, the reinforcing support connection protrusion has a triangular prism structure, and the surface of the protrusion is provided with anti-slip texture. Multiple reinforcing support connection protrusions are evenly distributed along the circumference of the inner shell.

[0007] Furthermore, a dustproof ring is installed in the middle of the connecting end plate.

[0008] Furthermore, the upper end of the connecting cylinder is fixedly connected to the connecting end plate, and the lower end of the connecting cylinder is detachably connected.

[0009] Furthermore, the protective plate is located inside the connecting cylinder and sleeved on the outside of the piston rod. The protective plate is slidably connected to the inner wall of the connecting cylinder via a slide rail and can move axially along the piston rod. A sealing ring is provided on the edge of the protective plate.

[0010] Furthermore, the fixing seat is fixedly installed on the top of the inner wall of the connecting cylinder.

[0011] Furthermore, the bottom of the buffer block is embedded in a groove on the upper surface of the piston, and the buffer block is fixedly connected to the piston by countersunk screws. The buffer block is made of highly elastic polyurethane material.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. The hollow cavity has evenly distributed triangular prism-shaped reinforcing support protrusions, which enhance the connection strength between the inner shell and the protective outer shell, reduce the loosening of the sealing structure caused by vibration, and work with the buffer block to absorb the impact of piston movement and reduce the risk of leakage.

[0014] 2. The dustproof ring of the connecting end plate, the sealing joint of the hydraulic oil through hole, the sealant of the threaded connection and the silicone rubber ring form a multi-dimensional seal. When the protective plate slides along the piston rod axis, it dynamically prevents dust through the edge sealing ring, preventing impurities from entering and wearing the seals.

[0015] 3. The detachable design at the lower end of the connecting cylinder facilitates maintenance of the piston rod sealing assembly, and the shock-absorbing rubber layer of the fixed seat improves the operational stability of the equipment, meeting the high reliability requirements of industrial production. In summary, this type of electro-hydraulic actuator with a leak-proof structure has wide applicability, solving the problems mentioned in the background art, such as easy failure of seals in multiple parts, poor vibration resistance, and single protection, which easily lead to hydraulic oil leakage in existing electro-hydraulic actuators. Attached Figure Description

[0016] Figure 1 is a structural schematic diagram of this utility model.

[0017] Explanation of key component symbols:

[0018] 1-Inner shell, 2-Protective outer shell, 3-Piston rod, 4-Piston, 5-First hydraulic oil through hole, 6-Second hydraulic oil through hole, 7-Buffer block, 8-Reinforcing support connecting protrusion, 9-Connecting end plate, 10-Threaded connection part, 11-Connecting cylinder, 12-Fixed base plate, 13-Fixed seat, 14-Protective plate, 15-Dustproof ring. Detailed Implementation

[0019] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples, but the examples given are not intended to limit the present utility model.

[0020] As shown in Figure 1, the embodiment of this utility model includes an inner shell 1, a piston rod 3, a piston 4, a first hydraulic oil through hole 5, a second hydraulic oil through hole 6, a fixed base 13, and a protective plate 14. The double-shell structure consists of a protective outer shell 2 on the outer side of the inner shell 1, forming a hollow cavity between them. Multiple triangular prism-shaped reinforcing support protrusions 8 are distributed within the cavity, evenly arranged along the circumference of the inner shell 1. The surfaces of the protrusions 8 are provided with anti-slip textures to enhance the rigidity of the connection between the shells and suppress structural deformation caused by vibration.

[0021] The upper end of the connecting cylinder 11 is fixed to the connecting end plate 9, and the lower end adopts a detachable structure for easy maintenance of internal components; the connecting end plate 9 is threadedly engaged with the lower end of the protective outer shell 2 through the threaded connection part 10 to form a stable sealed connection interface.

[0022] A dustproof ring 15 is installed at the point where the piston rod 3 passes through the connecting end plate 9, which effectively prevents external impurities from entering and reduces wear on the surface of the piston rod 3. The dustproof ring 15 is made of oil-resistant rubber, and the lip structure design ensures a tight fit with the piston rod 3.

[0023] The edge of the protective plate 14 is provided with a sealing ring, which slides with the inner wall of the connecting cylinder 11 through a slide rail and can move axially along the piston rod 3 to compensate for the deformation of the housing; the fixed seat 13 and the protective plate 14 divide the interior of the connecting cylinder 11 into an independent chamber to prevent hydraulic oil leakage and diffusion.

[0024] When the threaded connection part 10 is fitted, sealant is used to fill the gap to enhance the reliability of static sealing and prevent hydraulic oil from leaking out from the threaded interface.

[0025] A buffer block 7, made of highly elastic polyurethane material, is fixedly installed on the upper end of the piston 4. It is embedded in the groove on the upper surface of the piston 4 and fixed with countersunk screws. The buffer block 7 absorbs the impact when the piston rod 3 moves to its limit position, preventing the piston 4 from rigidly colliding with the connecting end plate 9 and protecting the internal structure.

[0026] The dust ring 15 in the middle of the connecting end plate 9 continuously scrapes away the dust and oil adhering to the surface of the piston rod 3, keeping the moving parts clean; the gap between the sealing ring of the protective plate 14 and the slide rail has been optimized to balance sealing performance and smooth sliding.

[0027] The triangular prism-shaped reinforcing protrusion 8 enhances the connection strength between the inner and outer shells through multi-point support, effectively reducing the impact of vibration on the seals, and is suitable for high-vibration operating environments.

[0028] The sliding design of the protective plate 14 along the piston rod 3 axis can automatically adjust the sealing surface pressure according to changes in working conditions, ensuring sealing stability under different temperature or load conditions.

[0029] The detachable structure and modular component design at the lower end of the connecting cylinder 11 make the maintenance and replacement of internal seals and buffer components more efficient, reducing equipment downtime.

[0030] All electrical components mentioned in the text are electrically connected to an external controller and power supply, and the controller can be a conventional known device such as a computer that provides control.

[0031] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electro-hydraulic actuator device with a leak-proof structure, comprising an inner housing (1), a piston rod (3), a piston (4), a first hydraulic oil through hole (5), a second hydraulic oil through hole (6), a fixed seat (13), and a protective plate (14), wherein the fixed seat (13) and the protective plate (14) are both installed inside a connecting cylinder (11), one end of the piston rod (3) is fixedly provided with the piston (4), and the other end of the piston rod (3) passes through a connecting end plate (9) and a fixed base plate (12), characterized in that, A protective outer shell (2) is provided on the outside of the inner shell (1). A hollow cavity is formed between the protective outer shell (2) and the inner shell (1). A reinforcing support connection protrusion (8) is provided in the hollow cavity. There are multiple reinforcing support connection protrusions (8), which are evenly distributed in the hollow cavity. A buffer block (7) is fixedly installed on the upper end of the piston (4). A threaded connection part (10) is fixedly provided on the upper end of the connecting end plate (9). The threaded connection part (10) is threadedly connected to the lower end of the outer wall of the protective outer shell (2).

2. The electro-hydraulic actuator device with a leak-proof structure as described in claim 1, characterized in that, The reinforcing support connecting protrusion (8) is a triangular prism structure with anti-slip texture on the surface of the protrusion. Multiple reinforcing support connecting protrusions (8) are evenly distributed around the inner shell (1).

3. The electro-hydraulic actuator device with a leak-proof structure as described in claim 2, characterized in that, A dustproof ring (15) is installed in the middle of the connecting end plate (9).

4. The electro-hydraulic actuator device with a leak-proof structure as described in claim 3, characterized in that, The upper end of the connecting cylinder (11) is fixedly connected to the connecting end plate (9), and the lower end of the connecting cylinder (11) is detachably connected.

5. The electro-hydraulic actuator device with a leak-proof structure as described in claim 4, characterized in that, The protective plate (14) is located inside the connecting cylinder (11) and sleeved on the outside of the piston rod (3). The protective plate (14) is slidably connected to the inner wall of the connecting cylinder (11) through a slide rail and can move axially along the piston rod (3). The edge of the protective plate (14) is provided with a sealing ring.

6. The electro-hydraulic actuator device with a leak-proof structure as described in claim 5, characterized in that, The fixing seat (13) is fixedly installed on the top of the inner wall of the connecting cylinder (11).

7. The electro-hydraulic actuator device with a leak-proof structure as described in claim 6, characterized in that, The bottom of the buffer block (7) is embedded in the groove on the upper surface of the piston (4). The buffer block (7) is fixedly connected to the piston (4) by countersunk screws. The buffer block (7) is made of high-elasticity polyurethane material.

Images