Hydraulic cylinder with multiple sealing structure

Abstract

The utility model provides a kind of multiple sealing structure oil cylinder with, including cylinder barrel, piston rod and piston, the piston is fixedly installed in piston rod one end, the piston is slidably connected in cylinder barrel, sealing head is connected in the cylinder barrel, first sealing ring and second sealing ring are respectively connected in the cylinder barrel, the cylinder barrel is integrally formed with the number of two limit ring, protective mechanism is provided on the limit ring, the cylinder barrel top is equipped with dust cover, the dust cover both ends are integrally formed with boss, first fixed mechanism is provided on the boss, the dust cover top is provided with connecting plate, the connecting plate bottom is integrally formed with anti-loosening plate, second fixed mechanism is provided on the connecting plate;The oil cylinder is provided with detachable dust cover in top, can effectively block dust into cylinder body, and is provided with anti-loosening component, can effectively avoid that dust cover loosens or falls off due to vibration, form double insurance.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinders, and more specifically, to a cylinder with a multi-seal structure. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. The output force of a hydraulic cylinder is directly proportional to the effective area of ​​the piston and the pressure difference between its two sides. A hydraulic cylinder basically consists of a cylinder barrel and cylinder head, a piston and piston rod, a sealing device, a buffer device, and a venting device. The buffer and venting devices are optional depending on the specific application, while the other devices are essential. As the core actuator of a hydraulic system, the hydraulic cylinder converts hydraulic energy into mechanical energy to achieve high-load, high-precision linear motion control. It is widely used in engineering machinery (such as excavators and cranes), industrial manufacturing (machine tools, injection molding machines), transportation (automobile suspension, aircraft landing gear), metallurgy and mining, agriculture, and aerospace. Its importance lies in its efficient energy conversion, smooth motion, adaptability to harsh environments, and safety and reliability.

[0003] In the existing technology, the top of the hydraulic cylinder lacks a dustproof function, and external dust and sand can easily enter from the port, contaminating the hydraulic oil and accelerating the wear of the seals. Therefore, we have made an improvement and proposed a cylinder with a multi-seal structure. Utility Model Content

[0004] To address the problems raised in the background art, this utility model provides the following technical solution:

[0005] A hydraulic cylinder with a multi-seal structure is used to improve the above-mentioned problems.

[0006] The present invention is as follows:

[0007] The device includes a cylinder, a piston rod, and a piston. The piston is fixedly installed at one end of the piston rod and slidably connected inside the cylinder. A sealing head is snapped into the cylinder. A first sealing ring and a second sealing ring are also snapped into the cylinder, with the second sealing ring located above the first sealing ring and the first sealing ring located above the sealing head. Two limiting rings are integrally formed inside the cylinder, and a protective mechanism is provided on the limiting rings. A dust cover is fitted on the top of the cylinder. Both ends of the dust cover have integrally formed protrusions, and a first fixing mechanism is provided on the protrusions. A connecting plate is provided on the top of the dust cover, and an anti-loosening plate is integrally formed on the bottom of the connecting plate. A second fixing mechanism is provided on the connecting plate.

[0008] As a preferred embodiment of this invention, the protective mechanism includes a rubber ring adhered to the surface of the limiting ring.

[0009] As a preferred technical solution of this utility model, the first fixing mechanism includes bolts disposed on the convex plate.

[0010] As a preferred technical solution of this utility model, a rubber pad is adhered to the surface of the convex plate.

[0011] As a preferred embodiment of the present invention, the second fixing mechanism includes screws disposed on the connecting plate.

[0012] As a preferred technical solution of this utility model, the cylinder is respectively connected to a first oil nozzle and a second oil nozzle, with the first oil nozzle located above the second oil nozzle.

[0013] As a preferred technical solution of this utility model, a first lifting lug is fixedly connected to the top of the piston rod.

[0014] As a preferred technical solution of this utility model, a second lifting lug is fixedly connected to the bottom of the cylinder.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] In the solution of this utility model:

[0017] 1. By setting a sealing head, a first sealing ring, and a second sealing ring, the sealing head acts as a basic barrier, tightly engaging with the inner wall of the cylinder to prevent hydraulic oil from leaking from below the piston. The first sealing ring and the second sealing ring form a progressive seal. The first sealing ring is located above the sealing head and mainly prevents high-pressure oil from penetrating upwards. The second sealing ring further intercepts any oil that may pass through, forming a double dynamic seal.

[0018] 2. By fixing the dust cover with a protruding plate and bolts, external dust is blocked from entering the piston rod movement area. The connecting plate is then connected to the top of the cylinder by screws through the dust cover. This prevents the dust cover from falling off due to vibration and solves the problem that the top of the cylinder lacks dust protection in the existing technology, allowing external dust and sand to easily enter from the port, contaminating the hydraulic oil and accelerating the wear of the seals.

[0019] 3. By bonding a rubber ring to the limiting ring, the piston's movement impact can be buffered, thus protecting the piston. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of the hydraulic cylinder with multiple sealing structures provided by this utility model;

[0021] Figure 2A cross-sectional structural diagram of a hydraulic cylinder with a multi-seal structure provided by this utility model;

[0022] Figure 3 A cross-sectional front view of the hydraulic cylinder with a multi-seal structure provided by this utility model;

[0023] Figure 4 The hydraulic cylinder with a multi-seal structure provided by this utility model Figure 3 Schematic diagram of the upper and middle sections;

[0024] Figure 5 The hydraulic cylinder with a multi-seal structure provided by this utility model Figure 3 Schematic diagram of the lower middle section;

[0025] Figure 6 A partial structural diagram of the hydraulic cylinder with a multi-seal structure provided by this utility model;

[0026] Figure 7 A schematic diagram of the rubber gasket structure of the hydraulic cylinder with multiple sealing structures provided by this utility model;

[0027] Figure 8 A schematic diagram of the bottom structure of the dust cover for the hydraulic cylinder with multiple sealing structures provided by this utility model;

[0028] Figure 9 This is a schematic diagram of the screw structure of the hydraulic cylinder with multiple sealing structures provided by this utility model.

[0029] The image shows:

[0030] 1. Cylinder; 2. Piston rod; 3. Piston; 4. Sealing head; 5. First sealing ring; 6. Second sealing ring; 7. Limiting ring; 9. Dust cover; 10. Protruding plate; 12. Connecting plate; 13. Anti-loosening plate; 14. Rubber ring; 15. Rubber pad; 16. Bolt; 17. Screw; 18. First grease nipple; 19. Second grease nipple; 20. First lifting lug; 21. Second lifting lug. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0032] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0033] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Example:

[0037] like Figure 1-9As shown, this embodiment proposes a hydraulic cylinder with a multi-seal structure, including a cylinder barrel 1, a piston rod 2, and a piston 3. The piston 3 is fixedly installed at one end of the piston rod 2. Hydraulic fluid pushes the piston 3, which in turn drives the piston rod 2. The piston 3 is slidably connected inside the cylinder barrel 1 and slides within it. A sealing head 4 is snapped into the cylinder barrel 1, acting as a basic barrier and tightly engaging with the inner wall of the cylinder barrel 1 to prevent hydraulic oil from leaking from below the piston 3. A first sealing ring 5 and a second sealing ring 6 are also snapped into the cylinder barrel 1, forming a progressive seal. The first sealing ring 5 is located above the sealing head 4, primarily preventing high-pressure hydraulic fluid from penetrating upwards; the second sealing ring 6 further intercepts any possible hydraulic fluid, forming a double dynamic seal. The cylinder barrel 1 contains a... The cylinder body has two limiting rings 7, each with a protective mechanism to buffer the impact of piston 3 movement and protect piston 3. A dust cover 9 is fitted on the top of the cylinder barrel 1 to prevent external dust from entering the piston rod 2 movement area. Both ends of the dust cover 9 are integrally formed with protruding plates 10, and the protruding plates 10 are provided with a first fixing mechanism to fix the dust cover 9. A connecting plate 12 is provided on the top of the dust cover 9, and an anti-loosening plate 13 is integrally formed on the bottom of the connecting plate 12. A second fixing mechanism is provided on the connecting plate 12. This hydraulic cylinder has a detachable dust cover on the top, which can effectively prevent dust from entering the cylinder body. Moreover, the anti-loosening component can effectively prevent the dust cover from loosening or falling off due to vibration, forming a double insurance.

[0038] The protective mechanism includes a rubber ring 14 bonded to the surface of the limiting ring 7. The rubber ring 14 on the limiting ring 7 is bonded to the surface of the limiting ring 7 to buffer the impact of the piston 3 movement and protect the piston 3.

[0039] The first fixing mechanism includes bolts 16 mounted on the protruding plate 10, and the dust cover 9 is fixed by the protruding plate 10 and the bolts 16.

[0040] A rubber pad 15 is adhered to the surface of the convex plate 10. When the screw 16 is tightened, the rubber pad 15 can play an adjustment role.

[0041] The second fixing mechanism includes screws 17 installed on the connecting plate 12, which are used to connect the connecting plate 12 through the dust cover 9 and finally to the top of the cylinder 1.

[0042] The cylinder 1 is connected to a first oil nozzle 18 and a second oil nozzle 19 respectively. The first oil nozzle 18 is located above the second oil nozzle 19. Hydraulic oil enters and exits the cylinder 1 through the high-pressure side of the first oil nozzle 18 and the low-pressure side of the second oil nozzle 19, driving the piston 3 to reciprocate. A first lifting lug 20 is fixedly connected to the top of the piston rod 2. The piston rod 2 transmits linear motion to an external load such as a robotic arm. The first lifting lug 20 at the top is used to connect to the actuator.

[0043] Specifically, this hydraulic cylinder has a multi-seal structure: the sealing head 4 acts as a basic barrier, tightly engaging with the inner wall of the cylinder barrel 1 to prevent hydraulic oil from leaking from below the piston 3; the first sealing ring 5 and the second sealing ring 6 form a progressive seal; the first sealing ring 5 is located above the sealing head 4, mainly preventing high-pressure oil from penetrating upwards; the second sealing ring 6 further intercepts any oil that may pass through, forming a double dynamic seal.

[0044] The rubber ring 14 on the limiting ring 7 is bonded to the surface of the limiting ring 7 to buffer the impact of the piston 3 movement and protect the piston 3.

[0045] The dust cover 9, which is fitted on the top of the cylinder 1, is fixed by the protruding plate 10 and bolts 16 to prevent external dust from entering the piston rod 2 movement area. The connecting plate 12 is then connected to the top of the cylinder 1 by screws 17 through the dust cover 9, which can prevent the dust cover 9 from falling off due to vibration.

[0046] All technical features in this embodiment can be freely combined according to actual needs.

[0047] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A hydraulic cylinder with a multi-seal structure, comprising a cylinder barrel (1), a piston rod (2), and a piston (3), wherein the piston (3) is fixedly mounted on one end of the piston rod (2), and the piston (3) is slidably connected within the cylinder barrel (1), characterized in that, A sealing head (4) is snapped into the cylinder (1). A first sealing ring (5) and a second sealing ring (6) are also snapped into the cylinder (1). The second sealing ring (6) is located above the first sealing ring (5). The first sealing ring (5) is located above the sealing head (4). Two limiting rings (7) are integrally formed inside the cylinder (1). A protective mechanism is provided on the limiting rings (7). A dust cover (9) is fitted on the top of the cylinder (1). Both ends of the dust cover (9) are integrally formed with protruding plates (10). A first fixing mechanism is provided on the protruding plates (10). A connecting plate (12) is provided on the top of the dust cover (9). An anti-loosening plate (13) is integrally formed on the bottom of the connecting plate (12). A second fixing mechanism is provided on the connecting plate (12).

2. A hydraulic cylinder with a multiple sealing structure according to claim 1, characterized in that, The protective mechanism includes a rubber ring (14) bonded to the surface of the limiting ring (7).

3. A hydraulic cylinder with a multiple sealing structure according to claim 1, characterized in that, The first fixing mechanism includes bolts (16) disposed on the protrusion plate (10).

4. A hydraulic cylinder with a multiple sealing structure according to claim 3, characterized in that, A rubber pad (15) is adhered to the surface of the convex plate (10).

5. A hydraulic cylinder with a multiple sealing structure according to claim 1, characterized in that, The second fixing mechanism includes screws (17) disposed on the connecting plate (12).

6. A hydraulic cylinder with a multiple sealing structure according to claim 1, characterized in that, The cylinder (1) is connected to a first oil nozzle (18) and a second oil nozzle (19), with the first oil nozzle (18) located above the second oil nozzle (19).

7. A hydraulic cylinder with a multiple sealing structure according to claim 1, characterized in that, The piston rod (2) is fixedly connected to the top of the first lifting lug (20).

8. A hydraulic cylinder with a multiple sealing structure according to claim 1, characterized in that, The bottom of the cylinder (1) is fixedly connected to a second lifting lug (21).

Images