High seal pneumatic actuator end cap

Abstract

The utility model discloses a kind of high sealing pneumatic actuator end cover, including screw cover, pressure rod, deformation sleeve, sealing ring and fixed cone ring, guide pillar is equipped in screw cover, fixed cone ring is sleeved on the surface of guide pillar, pull rod is equipped in the through of guide pillar, and the one end of pull rod is screw-connected with screw sleeve handlebar;Pressure rod is sleeved on the outside of fixed cone ring, and its top surface is abutted with the bottom surface of deformation sleeve;Limiting groove and several staggered arrangement deformation gap are equipped on the surface of deformation sleeve, and sealing ring is sleeved on the surface of limiting groove;The outer surface of fixed cone ring is equipped with cone expansion surface, and deformation sleeve is sleeved on it. When using, drive pull rod axial movement by screwing screw sleeve handlebar, to compress deformation sleeve, make it radial expansion under the guidance of cone expansion surface, to compress sealing ring and realize sealing. The utility model is compact in structure, easy to assemble, with double sealing effect of internal expansion and external adhesion, suitable for high sealing requirement pneumatic actuator.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic actuator technology, specifically a high-sealing pneumatic actuator end cap. Background Technology

[0002] Pneumatic actuators, as commonly used power components in modern automated equipment, are widely used in production lines, robots, fixture control systems, and other fields. To ensure the normal operation of actuators under complex conditions such as high pressure, high frequency vibration, or high temperature, the sealing structures at both ends must possess high-strength mechanical connection performance and excellent sealing effect.

[0003] In existing technologies, the commonly used pneumatic actuator end cover sealing structure typically employs an elastic O-ring directly installed between the cylinder end cover and the cylinder body, with the seal achieved through bolt tightening. Although the structure is simple and the manufacturing cost is low, its sealing pressure depends on the tightness of the bolts, the contact area of ​​the sealing surface is limited, making it difficult to guarantee a long-term reliable seal under high pressure or deformation conditions, and it is prone to leakage as components wear.

[0004] Therefore, there is an urgent need for a pneumatic actuator end cap structure that is compact, efficiently assembled, has dual sealing capabilities of internal expansion and external sealing, and is easy to install quickly and reliably lock, in order to solve many problems in the existing technology and meet the practical application requirements of high-reliability sealing applications. Utility Model Content

[0005] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted by this utility model is as follows: a high-sealing pneumatic actuator end cover, including a screw cap, a pressure rod, a deformation sleeve, a sealing ring, and a fixed conical ring. Helical tightening is achieved through internally arranged guide posts, pull rods, and a screw sleeve throttle. The deformation sleeve undergoes radial expansion under the guidance of the conical expansion structure, driving the sealing ring to fit against the inner wall of the cylinder, achieving efficient sealing. This utility model has a simple structure, reliable sealing, and quick installation, and is suitable for end connection structures of pneumatic equipment with high sealing performance requirements.

[0007] In a preferred embodiment, the screw cap is further configured such that: a guide post is provided on the inner side of the screw cap, the guide post serves as a support shaft for supporting the pull rod and other components, the fixed cone ring is sleeved on the surface of the guide post, the pull rod is provided through the guide post, and one end of the pull rod is connected to a screw sleeve throttle via a thread.

[0008] Specifically, tightening the screw sleeve handle can drive the pull rod to move axially, thereby transmitting tension to the pressure rod and providing driving force for the deformation sleeve to be pressed. The operation is simple and the force transmission is clear.

[0009] In a preferred example, the pressure rod is further configured such that it is slidably sleeved on the outside of the fixed cone ring for moving under the axial traction of the pull rod, and the top surface of the pressure rod abuts against the bottom surface of the deformation sleeve.

[0010] Specifically, during the movement of the compression bar, the tensile force can be converted into axial compression of the deformation sleeve, thereby realizing the radial deformation of the deformation sleeve under the guidance of the conical expansion structure.

[0011] In a preferred embodiment, the outer surface of the deformation sleeve is provided with a limiting groove, and a sealing ring is sleeved on the surface of the limiting groove to limit the position of the sealing ring and the direction of deformation expansion.

[0012] Specifically, the limiting groove structure can effectively prevent the sealing ring from shifting axially during assembly or under pressure, thereby improving the assembly accuracy and reliability of the sealing assembly.

[0013] In a preferred embodiment, the outer surface of the deformation sleeve is further configured such that a plurality of staggered deformation gaps are provided, which are circumferentially distributed elongated strip openings.

[0014] Specifically, the staggered deformation gaps can effectively enhance the radial elasticity of the deformation sleeve, enabling it to produce uniform and controllable radial expansion deformation under axial compression, thus applying a constant outward expansion stress to the sealing ring.

[0015] In a preferred embodiment, the outer surface of the fixed conical ring is provided with a conical expansion surface, and the deformation sleeve is slidably sleeved on the conical expansion surface to provide radial support force and guide its deformation direction during the pressing process.

[0016] Specifically, the conical expansion structure makes the radial deformation of the deformation sleeve controllable and repeatable, effectively enhancing the sealing and clamping capacity and improving the mechanical stability of the overall structure.

[0017] In a preferred embodiment, the sealing ring is further configured such that it is made of an elastic material and has multiple raised ridges on its outer side for forming a multi-line contact seal with the inner wall of the cylinder.

[0018] Specifically, the multi-ribbed structure not only increases the sealing contact area, but also forms a tighter fit with the cylinder wall during deformation and expansion, thus improving the sealing level.

[0019] In a preferred embodiment, the screw cap is further configured such that its inner side is provided with internal threads that mate with the pneumatic actuator housing, and the radial clearance between its inner cavity and the sealing ring is not greater than the cylinder wall thickness.

[0020] Specifically, the structure features a compact size, effectively preventing gas leakage from unsealed areas and improving the sealing integrity of the end assembly.

[0021] The beneficial effects achieved by this utility model are as follows: 1. In this utility model, a dual sealing method of internal expansion sealing and external radial contact sealing is achieved by adopting a combination structure of deformation sleeve and sealing ring. Specifically, under the compression of the pressure rod and the guiding action of the conical expansion surface, the deformation sleeve can generate controllable radial expansion deformation, thereby causing multiple protrusions of the sealing ring to form a high degree of contact with the inner wall of the pneumatic actuator cylinder, constructing a stable and reliable sealing structure and effectively preventing gas leakage.

[0022] 2. In this utility model, by setting the screw sleeve throttle to be threadedly connected to the pull rod, and adopting a modular assembly design of components such as screw cap, guide post, and fixed cone ring, the user can complete the sealing and locking operation of the cylinder end cover by manually tightening the screw sleeve throttle without the aid of special tools. This achieves the technical effect of compact structure, simple operation, and efficient installation, and is particularly suitable for automated pneumatic equipment with frequent maintenance and high sealing requirements. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model; Figure 2 This is a schematic diagram of the internal structure of the screw cap according to an embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of one embodiment of the present invention; Figure 4 This is a schematic diagram of a screw cap structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the deformation sleeve, sealing ring, and fixed cone ring according to an embodiment of the present invention.

[0024] Figure label: 1. Screw cap; 11. Guide post; 12. Pull rod; 13. Screw sleeve throttle; 2. Pressure rod; 3. Deformation sleeve; 31. Limiting groove; 32. Deformation gap; 4. Sealing ring; 41. Raised ridge; 5. Fixed cone ring; 51. Conical expansion surface. Detailed Implementation

[0025] 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 specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0026] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0027] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a high-sealing pneumatic actuator end cover.

[0028] Combination Figures 1-5 As shown, the present invention provides a high-sealing pneumatic actuator end cover, comprising: a screw cap 1, a pressure rod 2, a deformation sleeve 3, a sealing ring 4, and a fixed cone ring 5.

[0029] The inner side of the screw cap 1 is provided with a guide post 11 for installing the embedded structure. The guide post 11 can be integrally formed with the screw cap 1 and is located at the center of the screw cap 1, providing longitudinal support and positioning function. The fixed cone ring 5 is an annular structure, and its inner hole is sleeved on the outer surface of the guide post 11. The fixed cone ring 5 and the guide post 11 can be interference-fitted to ensure a firm assembly.

[0030] like Figure 2 and Figure 3 As shown, a pull rod 12 is internally disposed within the guide post 11. The pull rod 12 is a shaft-shaped member used to transmit axial tensile force. A limiting structure is provided on the inner side of the guide post 11 to guide the axial movement of the pull rod 12. One end of the pull rod 12 is threaded and threadedly connected to a threaded sleeve handle 13. The threaded sleeve handle 13 includes an integrally formed nut section and a rotating handle located on one side of the nut. The user can manually rotate the threaded sleeve handle 13 to drive the pull rod 12 axially in the threaded connection state, thereby achieving the clamping action of the subsequent structure.

[0031] The pressure rod 2 is sleeved on the outer surface of the pull rod 12, and its lower end is slidably sleeved on the outer side of the fixed cone ring 5, allowing it to slide up and down relative to the fixed cone ring 5 under the axial drive of the pull rod 12. The top surface of the pressure rod 2 abuts against the bottom surface of the deformation sleeve 3, and the downward pressing action of the pressure rod 2 can press the deformation sleeve 3 axially against the surface of the fixed cone ring 5.

[0032] The deformation sleeve 3 is a cylindrical structure with a limiting groove 31 on its outer surface. The limiting groove 31 is an annular groove with a depth matching the thickness of the sealing ring 4, used to limit the position of the sealing ring 4 in the axial and radial directions, preventing it from being misaligned or displaced during the sealing and tightening process.

[0033] like Figure 5 As shown, the sealing ring 4 is fitted onto the outer surface of the limiting groove 31. The sealing ring 4 is made of elastic material and has multiple protruding ridges 41 on its outer side. These protruding ridges 41 are arranged along the outer periphery of the sealing ring to form a good fit with the inner wall of the pneumatic actuator after assembly, thereby improving the sealing effect.

[0034] The outer surface of the deformation sleeve 3 is also provided with a plurality of deformation gaps 32, which are elongated strip-shaped openings evenly distributed along the circumferential direction, preferably 4 to 12 in number, and arranged in an alternating manner. This structure significantly improves the elastic deformation capacity of the deformation sleeve 3 in the radial direction, allowing it to undergo controllable radial expansion when subjected to axial pressure, thereby enhancing the sealing and clamping capacity.

[0035] The outer surface of the fixed cone ring 5 is provided with a conical expansion surface 51, and the deformation sleeve 3 is slidably sleeved on the surface of the conical expansion surface 51. The conical expansion surface 51 has an outer cone structure, and its diameter gradually increases from top to bottom along the axial direction. When the pressure rod 2 presses the deformation sleeve 3 downward through the drive of the pull rod 12, the deformation sleeve 3 expands radially under the guidance and support of the conical expansion surface 51, causing the sealing ring 4 to undergo outward expansion deformation, so that the outer convex rib 41 of the sealing ring 4 is tightly fitted to the inner cylinder wall of the pneumatic actuator, forming a reliable sealing contact.

[0036] like Figure 3 As shown, the inner side of the screw cap 1 is also provided with an internal thread structure that is compatible with the cylinder body of the pneumatic actuator, which is used to reliably fix the entire end cap assembly to the open end of the pneumatic actuator. The inner cavity size of the screw cap 1 is designed such that the gap between it and the outer diameter of the sealing ring 4 is less than or equal to the cylinder wall thickness of the pneumatic actuator, thereby ensuring that the sealing structure has a good installation fit and avoiding the generation of leakage channels.

[0037] Working principle and usage process of this utility model: This utility model provides a high-sealing pneumatic actuator end cap, which uses a combination of helical drive, conical expansion fit, and radial deformation structure to achieve efficient sealing and fixation of the pneumatic actuator end. Its specific working principle is as follows: The end cap structure is threadedly connected to the cylinder end of the pneumatic actuator via a screw cap 1, achieving an external seal. A guide post 11 is installed inside the screw cap 1, serving as a support for the structural central axis and through which a tie rod 12 is installed. A fixed cone ring 5 is fitted onto the outer surface of the guide post 11 through its inner hole, forming an axial positioning base. The deformation sleeve 3 is a sleeve-shaped structure with a limiting groove 31 on its outer surface for installing a sealing ring 4. The sealing ring 4 is fitted into the limiting groove 31 and has multiple protruding ridges 41 on its outer side to enhance its contact with the inner wall of the pneumatic actuator cylinder, improving sealing performance.

[0038] The outer surface of the fixed cone ring 5 is provided with a conical expansion surface 51, and the deformation sleeve 3 is fitted onto this conical expansion surface 51. The outer surface of the deformation sleeve 3 is also provided with several staggered deformation gaps 32, giving it good radial elastic deformation capability. The pressure rod 2 is slidably installed on the outside of the fixed cone ring 5 and fitted onto the outer surface of the pull rod 12. By manually rotating the screw sleeve handle 13, the user drives the pull rod 12 to move axially, thereby pulling the pressure rod 2 towards the fixed cone ring 5.

[0039] When the pressure rod 2 moves, its top surface will press against the bottom surface of the deformation sleeve 3. Under the support and guidance of the conical expansion surface 51, the deformation sleeve 3 will undergo radial deformation that expands outward under pressure. At this time, the sealing ring 4 is squeezed by the deformation sleeve 3, and the multiple external protrusions 41 will fit against the inner wall of the pneumatic actuator to achieve a reliable circumferential seal.

[0040] The entire structure achieves a stable and uniform sealing effect under the combined action of axial force and radial deformation. Because the screw sleeve handle 13 has a self-locking capability, the entire sealing structure is not prone to loosening during long-term operation, exhibiting good stability and pressure resistance.

[0041] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-sealing pneumatic actuator end cap, characterized in that, include: Screw cap (1), pressure rod (2), deformation sleeve (3), sealing ring (4) and fixed cone ring (5). The inner side of the screw cap (1) is provided with a guide post (11), the fixed cone ring (5) is sleeved on the surface of the guide post (11), the surface of the guide post (11) is provided with a pull rod (12), and one end of the pull rod (12) is threaded with a screw sleeve throttle (13). The pressure rod (2) is slidably sleeved on the outside of the fixed cone ring (5), and a limiting groove (31) is opened on the surface of the deformation sleeve (3), and the sealing ring (4) is sleeved on the surface of the limiting groove (31). The surface of the deformation sleeve (3) is provided with a plurality of staggered deformation gaps (32), the pressure rod (2) is sleeved on the outer surface of the pull rod (12), and the top surface of the pressure rod (2) abuts against the bottom surface of the deformation sleeve (3).

2. The high-sealing pneumatic actuator end cap according to claim 1, characterized in that, The screw sleeve throttle (13) includes an integrally formed nut and a throttle located on one side of the nut, which is used to drive the pull rod (12) to move axially by manually turning it, thereby realizing the axial traction of the pressure rod (2).

3. The high-sealing pneumatic actuator end cap according to claim 1, characterized in that, The inner side of the screw cap (1) is provided with screw threads that engage with the pneumatic actuator, and the distance between the inner side of the screw cap (1) and the outer periphery of the sealing ring (4) is less than or equal to the wall thickness of the pneumatic actuator.

4. The high-sealing pneumatic actuator end cover according to claim 1, characterized in that, The inner surface of the fixed cone ring (5) is a smooth cylindrical surface, and its outer surface is provided with a conical expansion surface (51). The deformation sleeve (3) is slidably sleeved on the surface of the conical expansion surface (51).

5. The high-sealing pneumatic actuator end cover according to claim 1, characterized in that, The sealing ring (4) is made of elastic material and has multiple protrusions (41) on its outer side to enhance the sealing fit with the inner cylinder wall of the pneumatic actuator.

6. The high-sealing pneumatic actuator end cap according to claim 1, characterized in that, The deformation gap (32) is a slender strip-shaped opening evenly distributed along the circumference, with a quantity of 4 to 12, and is arranged in an alternating pattern, used to enhance the radial elastic deformation capability of the deformation sleeve (3).

7. The high-sealing pneumatic actuator end cap according to claim 1, characterized in that, The limiting groove (31) is an annular groove structure, the depth of which matches the thickness of the sealing ring (4), and is used to suppress the movement of the sealing ring in the axial direction.

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