A dustproof and waterproof cylinder

Abstract

This utility model relates to a dustproof and waterproof cylinder, including a cylinder body. A piston rod is connected to the output end of the cylinder body. A front cover and a protective cover are sequentially connected to the end of the cylinder body near the piston rod. One end of the piston rod passes through the inner side of the front cover and the protective cover. The inner wall of the protective cover is provided with multiple annular sealing rings and a dustproof and waterproof brush. The inner wall of the front cover is provided with an annular sealing ring. The inner wall of the protective cover near the front cover is provided with an elastic waterproof baffle. The elastic waterproof baffle expands away from the central axis of the protective cover in a free state. This utility model forms a multi-layer protection system of "mechanical seal + fiber barrier + elastic fit" through the combination of sealing rings, sealing rings, dustproof and waterproof brushes and elastic waterproof baffle, which effectively improves the dustproof and waterproof properties of the cylinder and can effectively deal with the problems of dust accumulation and moisture infiltration.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic actuator technology, and in particular to a dustproof and waterproof cylinder. Background Technology

[0002] As a pneumatic actuator that converts the pressure energy of compressed gas into mechanical energy in pneumatic transmission, the cylinder often faces complex and harsh working environments in actual use.

[0003] In dusty work environments, such as mining, construction, and food processing, the air is filled with a large amount of dust particles. This dust can easily accumulate in critical parts of the cylinder, such as the piston rod, leading to increased frictional resistance, severely affecting the normal operation of the cylinder, and even causing malfunctions in workpiece clamping, thus preventing the achievement of the intended work task.

[0004] Meanwhile, in damp or water-staining working environments, such as sanitation vehicle operation scenarios, ship equipment operating environments, and some food processing workshops, external moisture can easily seep into the cylinder body along components such as sliders and piston rods. This not only corrodes the metal parts inside the cylinder, reducing its service life, but may also damage the seals, thereby affecting the cylinder's sealing performance and working efficiency. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a dustproof and waterproof cylinder, the specific technical solution of which is as follows:

[0006] A dustproof and waterproof cylinder includes a cylinder body, with a piston rod connected to the output end of the cylinder body. A front cover and a protective cover are sequentially connected to the end of the cylinder body near the piston rod. One end of the piston rod passes through the inner side of the front cover and the protective cover. The inner wall of the protective cover is provided with multiple annular sealing rings and a dustproof and waterproof brush. The inner wall of the front cover is provided with an annular sealing ring. The inner wall of the protective cover near the front cover is provided with an elastic waterproof baffle. In a free state, the elastic waterproof baffle expands away from the central axis of the protective cover. When compressed, the elastic waterproof baffle tightly fits the end face of the front cover to form an annular sealing surface.

[0007] Preferably, the area where the inner wall of the cover contacts the piston rod is coated with a nano dustproof and waterproof coating, the thickness of which is 30-120 nanometers.

[0008] Preferably, the plurality of sealing rings and dustproof and waterproof brushes are arranged at intervals along the axial direction of the piston rod.

[0009] Preferably, the protective cover is made of polytetrafluoroethylene, the dustproof and waterproof brush is made of polypropylene fiber, and the elastic waterproof edge is made of silicone.

[0010] The beneficial effects of this utility model are:

[0011] 1. By combining sealing ring one, sealing ring two, dustproof and waterproof brush and elastic waterproof baffle, a multi-layer protection system of "mechanical seal + fiber barrier + elastic fit" is formed, which effectively improves the dustproof and waterproof of the cylinder and can effectively deal with the problems of dust accumulation and moisture infiltration.

[0012] 2. The application of PTFE (polytetrafluoroethylene) caps and nano-coatings reduces frictional wear between the piston rod and the cap. Simultaneously, the elastic compensation of the silicone rubber waterproof flange adapts to wear after long-term use, maintaining sealing performance. In humid environment tests, the cylinder's service life is extended compared to traditional cylinders. The expansion-compression sealing design of the elastic waterproof flange adapts to different installation precisions and operating vibration scenarios, ensuring a tight seal and improving cylinder reliability under complex operating conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0015] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0016] Reference numerals in the attached diagram: 1. Cylinder body; 2. Piston rod; 3. Front cover; 4. Protective cover; 5. Sealing ring one; 6. Dustproof and waterproof brush; 7. Elastic waterproof retaining edge; 8. Sealing ring two. Detailed Implementation

[0017] 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 embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] Example

[0019] A dustproof and waterproof cylinder, please refer to Figures 1-3It includes a main structure: the output end of the cylinder body 1 is coaxially connected to the piston rod 2, and the front cover 3 and the protective cover 4 are fixedly connected to the end of the cylinder body 1 near the piston rod 2 in sequence. The front cover 3 is connected to the front flange of the cylinder body 1 by bolts, and the protective cover 4 is screwed onto the outer edge of the front end of the front cover 3 by threads, forming a double-layer protective structure.

[0020] Specifically, the inner wall of the cover 4 is provided with multiple annular sealing rings 5 ​​and dustproof and waterproof brushes 6 at intervals along the axial direction of the piston rod 2. The sealing rings 5 ​​are made of fluororubber, and their lip structure fits tightly against the surface of the piston rod 2, which can prevent dust and moisture from entering; the dustproof and waterproof brushes 6 are made of polypropylene fibers, and the bristles are arranged at a 45° angle, which can effectively remove dust particles attached to the surface of the piston rod 2 and form a fiber barrier to block moisture.

[0021] The inner wall of the front cover 3 is provided with an annular sealing ring 2 8. The sealing ring 2 8 is a metal skeleton sealing ring, which is installed in the annular groove of the front cover 3 and is interference-fitted with the piston rod 2 to further enhance the sealing effect.

[0022] The inner wall of the cover 4 is provided with an elastic waterproof baffle 7, which is made of silicone rubber, at one end near the front cover 3. In the free state, the elastic waterproof baffle 7 expands away from the central axis of the cover 4, forming a flared structure; when the cover 4 is tightened with the front cover 3, the elastic waterproof baffle 7 is squeezed and fits tightly against the end face of the front cover 3, forming an annular sealing surface, which can effectively block water from seeping in along the connection between the cover 4 and the front cover 3.

[0023] The area of ​​the inner wall of the cover 4 that contacts the piston rod 2 is coated with a nano-dustproof and waterproof coating with a thickness of 30-120 nanometers. This coating is composed of silica nanoparticles and fluorocarbon resin, which can form an ultra-low surface energy film on the surface of the piston rod 2, making it difficult for dust and water droplets to adhere, while reducing the coefficient of friction and reducing the movement resistance of the piston rod 2.

[0024] Multiple sealing rings 5 ​​and dustproof and waterproof brushes 6 are arranged in an alternating pattern of "sealing ring-dustproof brush-sealing ring" along the piston rod 2 axis, forming a three-stage protection structure. This arrangement allows large dust particles to be removed first by the dustproof and waterproof brushes 6, then fine dust and moisture to be blocked by the sealing rings 5, and finally further filtered by the next stage of dustproof and waterproof brushes 6 and sealing rings 5, thus improving the overall protection effect.

[0025] The cover 4 is made of polytetrafluoroethylene, which has excellent corrosion resistance, self-lubrication and wear resistance. It can be used for a long time in humid and dusty environments, and has a low coefficient of friction, which can reduce wear on the piston rod 2 during movement.

[0026] Specifically, the cylinder body 1 is a cylindrical cylinder with a flange welded to the front end. The front cover 3 is fixed to the flange by four M6 bolts, with the bolt holes distributed on the circumference of the flange and evenly spaced.

[0027] The rear end of the cover 4 has an internal thread that engages with the external thread at the front end of the front cover 3 to ensure a secure connection.

[0028] The piston rod 2 has an external thread machined at its front end for connecting to the actuator. The piston rod 2 passes through the through hole in the center of the front cover 3 and the through hole in the center of the protective cover 4 in sequence, ensuring smooth movement of the piston rod 2.

[0029] The inner wall of the cover 4 is provided with three sealing rings 5 ​​and two dustproof and waterproof brushes 6 from back to front. The cross-section of each sealing ring 5 is Y-shaped, and the lip faces the cylinder body 1.

[0030] Specifically, the annular groove on the inner wall of the front cover 3 is 5mm deep and about 8mm wide. The sealing ring 2 8 is embedded in the groove, with its outer diameter having an interference fit with the groove and its inner diameter having a clearance fit with the piston rod 2 of 0.1mm.

[0031] The elastic waterproof edge 7 is in the shape of a ring and is fixed to the front end of the inner wall of the cover 4 by a hot vulcanization process.

[0032] Working principle:

[0033] Dust prevention process: When the cylinder piston rod 2 reciprocates, the bristles of the dustproof and waterproof brush 6 rub against the surface of the piston rod 2, brushing off the attached dust particles. The dust particles, blocked by the bristles, accumulate in the grooves on the inner wall of the cover 4, preventing them from entering the cylinder body 1. Simultaneously, the nano-dustproof and waterproof coating makes it difficult for dust to adhere to the surface of the piston rod 2, further reducing dust intrusion.

[0034] Waterproofing process: When external moisture seeps in through the gap between the cover 4 and the piston rod 2, it first encounters the sealing ring 5, which blocks most of the moisture. A small amount of moisture that passes through the sealing ring 5 is absorbed by the fibers of the dustproof and waterproof brush 6 or guided to the drainage hole of the cover 4 (not shown in the diagram). If the moisture reaches the front cover 3, the sealing ring 8 will form a sealing barrier again. In addition, the elastic waterproof edge 7, under the pressure of the cover 4 and the front cover 3, tightly fits the end face of the front cover 3, preventing moisture from seeping in from the connection between the cover 4 and the front cover 3, forming multiple layers of waterproof protection.

[0035] Movement process: When the compressed gas in the cylinder body 1 pushes the piston rod 2 to extend or retract, the low coefficient of friction between the polytetrafluoroethylene cover 4 and the piston rod 2 ensures the smooth movement of the piston rod 2. The nano-coating further reduces frictional resistance and improves the response speed of the cylinder.

[0036] This invention achieves highly efficient dust and water protection through the synergistic effect of its components, improving the reliability and service life of the cylinder in harsh environments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention shall be included within the protection scope of this invention.

Claims

1. A dustproof and waterproof type cylinder comprising a cylinder body (1), an output end of the cylinder body (1) being connected with a piston rod (2), characterized in that, The cylinder body (1) is connected to a front cover (3) and a protective cover (4) at one end near the piston rod (2). One end of the piston rod (2) passes through the inner side of the front cover (3) and the protective cover (4). The inner wall of the protective cover (4) is provided with multiple annular sealing rings (5) and dustproof and waterproof brushes (6). The inner wall of the front cover (3) is provided with an annular sealing ring (8). The inner wall of the protective cover (4) is provided with an elastic waterproof baffle (7) at one end near the front cover (3). The elastic waterproof baffle (7) expands in a direction away from the central axis of the protective cover (4) in a free state. After being squeezed, the elastic waterproof baffle (7) fits tightly against the end face of the front cover (3) to form an annular sealing surface.

2. The dustproof and waterproof cylinder according to claim 1, characterized in that: The area where the inner wall of the cover (4) contacts the piston rod (2) is coated with a nano dustproof and waterproof coating, the thickness of which is 30-120 nanometers.

3. The dustproof and waterproof cylinder according to claim 2, characterized in that: Multiple sealing rings (5) and dustproof and waterproof brushes (6) are arranged at intervals along the axial direction of the piston rod (2).

4. The dustproof and waterproof cylinder according to claim 3, characterized in that: The protective cover (4) is made of polytetrafluoroethylene, the dustproof and waterproof brush (6) is made of polypropylene fiber, and the elastic waterproof edge (7) is made of silicone.

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