Leak-proof structure for hydraulic cylinder

Abstract

The utility model provides an anti-leakage structure for a hydraulic cylinder, and relates to the technical field of hydraulic cylinders. The sealing assembly comprises a cylinder barrel fixedly connected to the end cover, a piston is slidably connected to the interior of the cylinder barrel, a sealing rubber strip is fixedly connected to the outer side of the piston, and an inclined opening is formed in the inner side of the top end of the cylinder barrel; the mounting assembly comprises mounting rods slidably connected to the four corners in the end cover, first threaded grooves are formed in the bottom ends of the outer sides of the mounting rods, and second threaded grooves are formed in the top ends of the outer sides of the mounting rods; by means of the design, the sealing performance of the hydraulic cylinder is improved, hydraulic oil leakage is reduced, friction and abrasion between the piston and the cylinder barrel are reduced, the service life of the hydraulic cylinder is prolonged, and the problem of hydraulic oil leakage caused by the fact that a sealing ring is prone to abrasion and deformation is effectively solved; the piston can be assembled and disassembled without an external tool, so that the maintenance difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a leak-proof structure for hydraulic cylinders. Background Technology

[0002] Hydraulic cylinders, as actuators that convert hydraulic energy into mechanical energy, are widely used in fields such as engineering machinery, machine tools, and marine machinery.

[0003] However, in practical use, existing hydraulic cylinders typically rely on seals to prevent hydraulic oil leakage, as the piston and end cap sections rely on these seals. However, due to pressure variations within the cylinder and the frequent reciprocating motion of the piston rod, these seals are prone to wear, deformation, and even breakage, leading to hydraulic oil leakage.

[0004] Therefore, this utility model provides a leak-proof structure for hydraulic cylinders. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a leak-proof structure for hydraulic cylinders.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a leak-proof structure for a hydraulic cylinder, including an end cap;

[0007] A sealing assembly, comprising a cylinder fixedly connected to an end cap, a piston slidably connected inside the cylinder, a sealing strip fixedly connected to the outside of the piston, and an oblique opening on the inner side of the top end of the cylinder;

[0008] The mounting assembly includes mounting rods slidably connected to the four corners inside the end cap. The bottom outer end of the mounting rod has a threaded groove, the top outer end of the mounting rod has a threaded groove, and the top end of the mounting rod has a through hole at each of the four corners. The top end of the mounting rod is threadedly connected to a top plate through the threaded groove.

[0009] In a preferred embodiment, an oil inlet is fixedly connected to the inside of the end cap, and an oil return port is fixedly connected to the inside of the top plate.

[0010] In a preferred embodiment, the mounting rod is threadedly connected to the bottom end of the end cap via a threaded groove, and a nut is threadedly connected to the bottom end of the mounting rod via the same threaded groove.

[0011] In a preferred embodiment, the top end of the cylinder engages with the interior of the top plate.

[0012] In a preferred embodiment, the oil inlet penetrates the interior of the end cover and is connected to the bottom end of the cylinder, and the oil return port penetrates the interior of the top plate and is connected to the top end of the cylinder.

[0013] In a preferred embodiment, the piston has a through hole two inside, and a piston rod is fixedly connected inside the piston.

[0014] In a preferred embodiment, a connecting post is fixedly connected to the top end of the piston rod, and a piston connector is fixedly connected to the bottom end of the piston rod, with the outer side of the piston connector fixedly connected to the bottom end of the piston.

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

[0016] This invention uses hydraulic oil to enter the cylinder through the inlet, pushing the piston to slide along the inner wall of the cylinder. The reciprocating motion of the piston is transmitted to the external load through the piston rod. The sealing strip tightly adheres to the inner wall of the cylinder, effectively preventing hydraulic oil leakage. After the work is completed, the hydraulic oil flows out of the cylinder through the return port and returns to the hydraulic system for recycling. When the piston moves to the top of the cylinder, the beveled design guides the piston to transition smoothly. This design improves the sealing performance of the hydraulic cylinder, reduces hydraulic oil leakage, and reduces friction and wear between the piston and the cylinder, extending the service life of the hydraulic cylinder. It effectively solves the problem of hydraulic oil leakage caused by easy wear and deformation of the sealing ring. Secondly, the beveled design makes installation more convenient, allowing the piston to be installed and removed without the need for external tools, reducing maintenance difficulty. Attached Figure Description

[0017] Figure 1 A perspective view of a leak-proof structure for a hydraulic cylinder provided by this utility model;

[0018] Figure 2 A schematic diagram of a cylinder assembly structure for a leak-proof hydraulic cylinder provided by this utility model;

[0019] Figure 3 A schematic diagram of a sealing assembly structure for a leak-proof structure of a hydraulic cylinder provided by this utility model;

[0020] Figure 4 A schematic diagram of the installation assembly structure for an anti-leakage structure for a hydraulic cylinder provided by this utility model;

[0021] Figure 5 A schematic diagram of a piston structure for a leak-proof structure for a hydraulic cylinder provided by this utility model.

[0022] Legend:

[0023] 1. End cap;

[0024] 2. Sealing assembly; 21. Oil inlet; 22. Cylinder; 23. Piston; 24. Sealing strip; 25. Oil return port; 26. Slanted opening;

[0025] 3. Mounting components; 31. Mounting rod; 32. Threaded groove one; 33. Threaded groove two; 34. Through hole one; 35. Top plate; 36. Nut;

[0026] 4. Through hole two; 5. Piston rod; 6. Connecting column; 7. Piston connector. Detailed Implementation

[0027] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figure 1 - Figure 5 As shown, this embodiment provides a technical solution: a leak-proof structure for a hydraulic cylinder, including an end cap 1;

[0029] The sealing assembly 2 includes a cylinder 22 fixedly connected to the end cover 1. An oil inlet 21 is fixedly connected inside the end cover 1. The oil inlet 21 penetrates the interior of the end cover 1 and communicates with the bottom end of the cylinder 22. A piston 23 is slidably connected inside the cylinder 22. A through hole 4 is opened inside the piston 23. A piston rod 5 is fixedly connected inside the piston 23. A sealing strip 24 is fixedly connected to the outside of the piston 23. An oil return port 25 is fixedly connected inside the top plate 35. A bevel 26 is opened on the inner side of the top end of the cylinder 22. A connecting post 6 is fixedly connected to the top end of the piston rod 5. A piston connector 7 is fixedly connected to the bottom end of the piston rod 5. The outside of the piston connector 7 is fixedly connected to the bottom end of the piston 23.

[0030] End cap 1, as a key fixing component of the hydraulic cylinder, fits tightly with cylinder barrel 22 to jointly construct a closed oil chamber space. This oil chamber not only provides solid support for the installation and fixing of the hydraulic cylinder, but also ensures the normal operation of the hydraulic system. Hydraulic oil enters the hydraulic cylinder through inlet 21, and its function is to drive piston 23 to perform effective reciprocating motion. Cylinder barrel 22 itself provides the necessary space for this reciprocating motion of piston 23, ensuring smooth movement. Through hole 4 is located inside piston 23, and its main function is to guide the flow direction of hydraulic oil, ensuring that the oil can smoothly push piston 23. Piston rod 5 transmits the movement of piston 23 to external load components. Sealing strip 24 can effectively prevent hydraulic oil from leaking out from the tiny gap between piston 23 and cylinder barrel 22, thereby significantly improving the overall sealing performance of the hydraulic cylinder. Compared with the traditional rigid direct contact method, this design not only ensures In addition to improving the sealing effect, the hydraulic cylinder's service life is extended by reducing hard contact. The top plate 35, as the top fixing component of the hydraulic cylinder, works together with the cylinder barrel 22 to further enhance the sealing of the oil chamber, improve the structural strength and sealing performance of the hydraulic cylinder, and effectively prevent hydraulic oil leakage. After completing its driving task, the hydraulic oil will flow out of the hydraulic cylinder through the return port 25 and return to the hydraulic system for recycling. The inclined port 26 is located on the inner side of the top of the cylinder barrel 22. The purpose of the inclined port 26 is to guide the movement trajectory of the piston 23 and ensure its accuracy. During the installation of the hydraulic cylinder, the design of the inclined port 26 makes the installation work simpler. No external tools are needed. The installation can be easily completed by the natural matching of the inclined port 26 and the piston 23. The connecting column 6 is used to connect the top of the piston rod 5 to ensure that the movement of the piston 23 can be effectively transmitted to the external load, thereby driving the movement of the external mechanical parts.

[0031] like Figure 2 - Figure 4 As shown, the mounting assembly 3 includes mounting rods 31 that are slidably connected to the four corners inside the end cover 1. The bottom outer end of the mounting rod 31 is provided with a threaded groove 32. The mounting rod 31 is threaded to the bottom end of the end cover 1 through the threaded groove 32. The top outer end of the mounting rod 31 is provided with a threaded groove 33. The top end of the mounting rod 31 is provided with a through hole 34 at the four corners. The top end of the mounting rod 31 is threaded to a top plate 35 through the threaded groove 33. The oil return port 25 penetrates the interior of the top plate 35 and communicates with the top end of the cylinder 22. The top end of the cylinder 22 is engaged with the interior of the top plate 35. The bottom end of the mounting rod 31 is threaded to a nut 36 through the threaded groove 32.

[0032] End cap 1, as a fixing component of the hydraulic cylinder, together with cylinder barrel 22, forms a sealed oil chamber, providing support for the installation and fixing of the hydraulic cylinder. Mounting rod 31 fixes the hydraulic cylinder in the installation position through threaded connection, ensuring the stability of the hydraulic cylinder. Thread groove 1 32 is used to fix mounting rod 31 to the bottom end of end cap 1, ensuring the stability of mounting rod 31. Thread groove 2 33 is used to fix mounting rod 31 to the top end of top plate 35, ensuring the stability of mounting rod 31. Through hole 1 34 is used for connection to the top end of mounting rod 31, facilitating the installation and fixing of top plate 35. Top plate 35, as the top fixing component of the hydraulic cylinder, together with cylinder barrel 22, forms a sealed oil chamber, and also provides connection to return port 25. Nut 36 is used to fix the bottom end of mounting rod 31, ensuring the stability of mounting rod 31, and allows for easy adjustment of the position of mounting rod 31, ensuring installation accuracy.

[0033] like Figure 1 - Figure 5 As shown:

[0034] In use: First, hydraulic oil enters the hydraulic cylinder through the inlet 21, which then pushes the piston 23 to reciprocate within the cylinder 22. This drives the piston rod 5 to transmit motion to the external load components, thereby driving the external mechanical parts and completing the mechanical energy output of the hydraulic cylinder. At the same time, the through hole inside the piston 23 guides the flow direction of the hydraulic oil, ensuring that the oil can smoothly push the piston 23 to move. The sealing strip 24 effectively prevents hydraulic oil from leaking from the gap between the piston 23 and the cylinder 22, significantly improving the overall sealing performance of the hydraulic cylinder. After the hydraulic oil completes its driving task, it flows out of the hydraulic cylinder through the return port 25 and returns to the hydraulic system for recycling. During installation, the inclined port 26 is designed to guide the movement trajectory of the piston 23, ensuring its accuracy and simplifying the installation process, which can be completed without the aid of external tools. The mounting rod 31 fixes the hydraulic cylinder in the installation position through a threaded connection, ensuring the stability of the hydraulic cylinder. The top plate 35 and the cylinder 22 together form a sealed oil chamber, further strengthening the structural strength and sealing performance of the hydraulic cylinder.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A leak-proof structure for a hydraulic cylinder, characterized in that, Including end caps (1); A sealing assembly (2) includes a cylinder (22) fixedly connected to an end cap (1), a piston (23) slidably connected inside the cylinder (22), a sealing strip (24) fixedly connected to the outside of the piston (23), and a bevel (26) opened on the inner side of the top end of the cylinder (22). The mounting assembly (3) includes mounting rods (31) that are slidably connected to the four corners inside the end cap (1). The bottom outer end of the mounting rod (31) is provided with a threaded groove (32), the top outer end of the mounting rod (31) is provided with a threaded groove (33), the top end of the mounting rod (31) is provided with a through hole (34) at the four corners, and the top end of the mounting rod (31) is threadedly connected to a top plate (35) through the threaded groove (33).

2. The anti-leakage structure for a hydraulic cylinder according to claim 1, characterized in that: The end cap (1) is fixedly connected to an oil inlet (21), and the top plate (35) is fixedly connected to an oil return port (25).

3. The anti-leakage structure for a hydraulic cylinder according to claim 1, characterized in that: The mounting rod (31) is threaded to the bottom end of the end cap (1) through a threaded groove (32), and the bottom end of the mounting rod (31) is threaded to a nut (36) through a threaded groove (32).

4. The anti-leakage structure for a hydraulic cylinder according to claim 1, characterized in that: The top of the cylinder (22) engages with the interior of the top plate (35).

5. The anti-leakage structure for a hydraulic cylinder according to claim 2, characterized in that: The oil inlet (21) penetrates the interior of the end cap (1) and is connected to the bottom end of the cylinder (22), and the oil return port (25) penetrates the interior of the top plate (35) and is connected to the top end of the cylinder (22).

6. The anti-leakage structure for a hydraulic cylinder according to claim 1, characterized in that: The piston (23) has a through hole 2 (4) inside, and a piston rod (5) is fixedly connected inside the piston (23).

7. The anti-leakage structure for a hydraulic cylinder according to claim 6, characterized in that: A connecting post (6) is fixedly connected to the top end of the piston rod (5), and a piston connector (7) is fixedly connected to the bottom end of the piston rod (5). The outer side of the piston connector (7) is fixedly connected to the bottom end of the piston (23).

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