Hydraulic cylinder with protection function

Abstract

This utility model relates to the field of hydraulic transmission technology, specifically to a hydraulic cylinder with protective function, solving the problems mentioned in the background art. It includes a hydraulic cylinder and a protective cover. The protective cover includes an outer bellows layer, inside which is an inner bellows layer. A spiral metal skeleton is provided between the outer and inner bellows layers. A dust scraper ring is fixed to the end of the protective cover. The inner diameter of the dust scraper ring is interference-fitted with the piston rod of the hydraulic cylinder. An inclined guide groove is provided on the outer side of the dust scraper ring, and the guide groove has an inclined drainage hole. This utility model, by adopting a double-layer bellows nested structure and adding a spiral metal skeleton, improves the mechanical strength and deformation resistance of the protective cover. The inclined cutting edge of the dust scraper ring cooperates with the drainage hole of the guide groove to remove contaminants from the piston rod surface and drain water quickly. The connection between the protective cover, the cylinder end cover, and the piston rod is stable and reliable, and the overall structure is compact, suitable for harsh working conditions such as dust.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic transmission technology, specifically to a hydraulic cylinder with protective functions. Background Technology

[0002] Hydraulic cylinders, as common power actuators, are widely used in engineering machinery, metallurgical equipment, mining machinery, and other fields. Due to the complex working environment, the piston rod of hydraulic cylinders is often exposed to harsh conditions such as dust, water vapor, corrosive media, or mechanical impact, which can easily lead to contaminant adhesion, seal wear, or impurities entering the cylinder body, thereby affecting the sealing performance and service life of the cylinder.

[0003] Traditional protective measures typically employ single-layer corrugated pipe protective covers or dust covers, but their pressure resistance is limited, and they are prone to deformation and damage under frequent expansion and contraction or external impacts. Furthermore, conventional dust scraping structures are ineffective at removing chips and water, allowing contaminants to accumulate inside the protective cover, potentially accelerating wear on the piston rod and seals over time. Some improved solutions attempt to use metal frames to enhance the protective cover's strength, but these structures are complex and lack sufficient flexibility, making it difficult to balance protective performance with adaptability to movement. Utility Model Content

[0004] To solve the above problems, this utility model provides the following technical solution: a hydraulic cylinder with protective function, including a hydraulic cylinder and a protective cover, the protective cover including an outer corrugated pipe, an inner corrugated pipe nested inside the outer corrugated pipe, the outer corrugated pipe and the inner corrugated pipe are provided with a spiral metal skeleton, a dust scraper ring is fixed at the end of the protective cover, the inner diameter of the dust scraper ring is interference-fitted with the piston rod of the hydraulic cylinder, the outer side of the dust scraper ring is provided with an inclined guide groove, and the guide groove is provided with an inclined drain hole.

[0005] Preferably, the blade of the dust scraper ring has an inclination angle of 30°-60° and is made of polyurethane or rubber.

[0006] Preferably, the drainage holes of the guide groove are evenly distributed along the circumference, and the hole diameter is 2-5mm.

[0007] Preferably, the protective cover is fixed to the cylinder end cover by a flange and connected to the piston rod of the hydraulic cylinder by a clamp.

[0008] Preferably, the extension length of the protective cover matches the stroke of the piston rod of the hydraulic cylinder.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] The double-layer corrugated pipe nesting structure and the addition of a spiral metal skeleton improve the mechanical strength and deformation resistance of the protective cover while maintaining good extensibility. The inclined blade of the dust scraper ring cooperates with the drainage hole of the guide groove to remove contaminants from the piston rod surface and drain water quickly, reducing the amount of impurities entering the cylinder. The connection between the protective cover and the cylinder end cover and piston rod is stable and reliable, and the overall structure is compact, making it suitable for harsh working conditions such as dust and humidity. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0012] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the dust scraper ring structure from the right side.

[0014] In the diagram: 1. Hydraulic cylinder; 2. Protective cover; 201. Outer corrugated pipe; 202. Inner corrugated pipe; 203. Spiral metal frame; 3. Dust scraper ring; 4. Guide groove; 5. Drain hole; 6. Flange; 7. Clamp. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0016] like Figure 1 As shown, the hydraulic cylinder with protective function in this embodiment includes a hydraulic cylinder 1 and a protective cover 2. The protective cover 2 includes an outer bellows 201, an inner bellows 202 nested inside the outer bellows 201, and a spiral metal skeleton 203 provided between the outer bellows 201 and the inner bellows 202. A dust scraper ring 3 is fixed at the end of the protective cover 2. The inner diameter of the dust scraper ring 3 is interference-fitted with the piston rod of the hydraulic cylinder 1. An inclined guide groove 4 is provided on the outer side of the dust scraper ring 3, and an inclined drain hole 5 is provided in the guide groove 4.

[0017] The blade of the dust scraper ring 3 has an inclination angle of 30°-60° and is made of polyurethane or rubber.

[0018] The drainage holes 5 of the guide channel 4 are evenly distributed along the circumference, with a diameter of 2-5mm.

[0019] The protective cover is fixed to the cylinder end cover by flange 6 and connected to the piston rod of hydraulic cylinder 1 by clamp 7.

[0020] The extension length of the protective cover 2 is matched with the stroke of the piston rod of the hydraulic cylinder 1.

[0021] The working principle of this utility model is as follows:

[0022] The working principle of this utility model is as follows: When the piston rod of the hydraulic cylinder 1 extends and retracts, the protective cover 2 extends and retracts accordingly. Its outer corrugated pipe 201 and inner corrugated pipe 202 structure, together with the spiral metal skeleton 203, provide pressure-resistant support to ensure that the protective cover 2 remains stable when deformed. During the movement of the piston rod, the inclined blade of the dust scraper ring 3 scrapes away contaminants on the surface of the rod and discharges impurities and liquids quickly through the guide groove 4 and the drain hole 5 to prevent them from entering the cylinder. The fixing method of the flange 6 and the clamp 7 ensures that the protective cover 2 is reliably connected to the cylinder end cover and the piston rod, so that it is always synchronized with the piston rod stroke, and achieves continuous and effective dustproof, waterproof and mechanical protection functions.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A hydraulic cylinder with protective function, comprising a hydraulic cylinder (1) and a protective cover (2), characterized in that, The protective cover (2) includes an outer corrugated pipe (201), an inner corrugated pipe (202) is nested inside the outer corrugated pipe (201), and a spiral metal skeleton (203) is provided for the outer corrugated pipe (201) and the inner corrugated pipe (202). A dust scraper ring (3) is fixed at the end of the protective cover (2). The inner diameter of the dust scraper ring (3) is interference-fitted with the piston rod of the hydraulic cylinder (1). An inclined guide groove (4) is provided on the outer side of the dust scraper ring (3), and an inclined drain hole (5) is provided in the guide groove (4).

2. A hydraulic cylinder with protective function according to claim 1, characterized in that: The blade of the dust scraper ring (3) has an inclination angle of 30°-60° and is made of polyurethane or rubber.

3. A hydraulic cylinder with protective function according to claim 1, characterized in that: The drainage holes (5) of the guide groove (4) are evenly distributed along the circumference, with a diameter of 2-5 mm.

4. A hydraulic cylinder with protective function according to claim 1, characterized in that: The protective cover is fixed to the cylinder end cap by a flange (6) and connected to the piston rod of the hydraulic cylinder (1) by a clamp (7).

5. A hydraulic cylinder with protective function according to claim 1, characterized in that: The extension length of the protective cover (2) is matched with the stroke of the piston rod of the hydraulic cylinder (1).

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