Lubricating-free telescopic rod dust protection structure
By integrating a positive pressure protection system with multi-stage sealing components, the dust prevention problem of the telescopic rod structure is solved, achieving efficient dust protection and a long-life, lubrication-free design, suitable for high-dust environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO SOUWEST MAGNETECH DEV
- Filing Date
- 2025-03-30
- Publication Date
- 2026-05-26
Smart Images
Figure CN224283074U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a telescopic structure, and more particularly to a non-lubricated telescopic structure. Background Technology
[0002] Currently, telescopic pole structures are widely used in industrial equipment, household appliances, and dust protection devices. Their core function lies in adapting to different scenario requirements through adjustable telescopic characteristics. In existing technologies, dust protection for telescopic poles mainly relies on the following two types of designs.
[0003] First, there's the mechanical seal and dust ring structure, which uses physical isolation to prevent dust from entering the telescopic components. Second, there's the removable protective sleeve design, which uses elastic material to wrap the moving rod and prevent dust from seeping into the gaps. However, mechanical dust prevention relies on lubrication. Most telescopic rods use threaded drives or guide groove structures, requiring regular lubrication to reduce frictional resistance. This structure has high maintenance costs and requires regular cleaning; otherwise, dust can easily mix with lubricating oil to form adhesive substances, accelerating wear and causing jamming. The removable protective sleeve design is not only structurally complex and has low adjustment precision, making operation cumbersome, but it's also prone to failure after long-term use due to material aging or dust penetration.
[0004] Neither of these structures can be used for a long time. Utility Model Content
[0005] This utility model addresses the shortcomings of existing technologies by providing a dust protection structure for a non-lubricated telescopic rod. Based on the principle of positive pressure protection and multiple sealing synergy, this application achieves dynamic sealing protection for the locking rod through the integrated design of a dustproof ring, a positive pressure chamber, and front and rear sealing components.
[0006] To solve the above-mentioned technical problems, the present invention provides a dust protection structure for a non-lubricated telescopic rod, comprising a cylinder body, a rod body disposed within the cylinder body, the portion of the rod body extending out of the cylinder body being a locking rod, a dustproof ring being disposed on the locking rod, a positive pressure chamber being disposed within the dustproof ring, and a front sealing assembly and a rear sealing assembly being respectively disposed on both sides of the positive pressure chamber, which are tightly fitted against the locking rod.
[0007] In the above technical solution, preferably, the dustproof ring is provided with an air inlet valve port, and the air inlet valve port is connected to the positive pressure chamber.
[0008] In the above technical solution, preferably, the front sealing assembly includes an annular scraper and a metal dust seal.
[0009] In the above technical solution, preferably, the rear sealing assembly includes at least one combined sealing ring.
[0010] In the above technical solution, preferably, the dustproof ring is provided with a scraper groove and a dustproof ring groove for fixing the annular scraper and the metal dustproof ring.
[0011] In the above technical solution, preferably, the dustproof ring is provided with a sealing ring groove for fixing the combined sealing ring.
[0012] In the above technical solution, preferably, the annular scraper has an angled tip, and the angled tip makes line contact with the locking rod.
[0013] In the above technical solution, preferably, the combined sealing ring is elastic.
[0014] In the above technical solution, preferably, the metal dustproof ring is in contact with the locking rod.
[0015] This application features a positive pressure protection system. A dustproof ring connects to the positive pressure chamber via an inlet valve, allowing compressed gas to be introduced to create a continuous positive pressure environment. This positive pressure field effectively blocks external dust intrusion and simultaneously assists the sealing components in forming a pressure gradient protection. Compared to traditional negative pressure suction solutions, the positive pressure design offers superior dust reverse isolation capabilities, making it particularly suitable for high-concentration dust conditions.
[0016] The front sealing assembly of this application employs a dual structure of annular scraper and metal dust ring. The beveled tip design of the annular scraper enables line contact scraping, effectively removing large particles adhering to the rod surface and reducing the wear pressure on subsequent sealing components. The metal dust ring forms a rigid sealing interface through surface contact, and its wear-resistant properties can withstand the impact of high-frequency reciprocating motion.
[0017] The rear sealing assembly of this application consists of at least one elastic composite sealing ring. The selection of elastic material and structural design enable it to have dynamic deformation compensation capability. Under the pressure support of the positive pressure chamber, the sealing ring maintains flexible contact with the rod body, which can both adapt to the axial displacement of the rod body's extension and contraction and compensate for radial clearance fluctuations caused by machining errors.
[0018] This application features a dedicated groove structure within the dustproof ring. Precision machining of the scraper groove, dustproof ring groove, and sealing ring groove ensures accurate positioning of each component. The modular design simplifies the assembly process, and the independent mounting positions for the scraper and sealing ring facilitate future maintenance and replacement.
[0019] This application's three-tiered protection system forms a progressive seal: scraper cleaning > metal ring coarse sealing > elastic ring fine sealing, combined with a positive pressure airflow barrier, resulting in an overall dustproof efficiency that is over 80% higher than traditional structures. Bench tests show that it maintains IP6 and IP7 protection ratings even at a 10Hz expansion frequency. Furthermore, by replacing traditional grease lubrication with a positive pressure air seal, it completely eliminates the risk of lubricant contamination, meeting the stringent cleanliness requirements of industries such as food and pharmaceuticals. The metal dustproof ring in this application is made of high-hardness alloy material, exhibiting high wear resistance and lifespan, while the elastic sealing ring is made of fluororubber composite material. The overall structural design life is 3-5 times longer than conventional structures, with a maintenance cycle exceeding 10,000 hours.
[0020] Compared with existing technologies, this application achieves dynamic sealing protection for the locking rod through the integrated design of a dustproof ring, a positive pressure chamber, and front and rear sealing components. The core structure consists of three main parts: the cylinder body, the locking rod, and the dustproof ring. The dustproof ring has a built-in positive pressure chamber and is equipped with a front and rear dual sealing system, forming a multi-level protective barrier. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the telescopic structure of this utility model.
[0022] Figure 2 This is a side view of the telescopic structure of this utility model.
[0023] Figure 3 This is a cross-sectional schematic diagram of the telescopic structure of this utility model.
[0024] Figure 4 This is a schematic diagram of the dustproof ring of this utility model.
[0025] Figure 5 This is a schematic cross-sectional view of the dustproof ring of this utility model.
[0026] Figure 6 for Figure 3 -A magnified view of a portion of the area. Detailed Implementation
[0027] The technical solutions of various embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments described in this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0028] Example 1, as Figures 1 to 6The diagram shows a dust protection structure for a non-lubricated telescopic rod, comprising a cylinder 4, a rod 5 disposed within the cylinder 4, a locking rod 2 extending beyond the cylinder 4, a dustproof ring 1 on the locking rod 2, a positive pressure chamber 11 within the dustproof ring 1, and a front sealing assembly and a rear sealing assembly respectively disposed on both sides of the positive pressure chamber 11, closely abutting the locking rod 2. An air inlet 3 is provided on the dustproof ring 1, communicating with the positive pressure chamber 11. The front sealing assembly includes an annular scraper 12 and a metal dustproof ring 13. The annular scraper 12 has a beveled tip, the beveled tip making line contact with the locking rod 2. The metal dustproof ring 13 makes surface contact with the locking rod 2. The rear sealing assembly includes two combined sealing rings 14. The combined sealing rings 14 are elastic. The dustproof ring 1 has a scraper groove 15 and a dustproof ring groove 16 for fixing the annular scraper 12 and the metal dustproof ring 13. The dustproof ring 11 contains a sealing groove 17 for fixing the combined sealing ring 14. The annular scraper 12 can be made of polyurethane or engineering plastic, and its cutting edge is designed with a 15°-25° beveled tip to form line contact with the locking rod 2. This design gives the scraper high elastic deformation capability, which can adapt to the slight unevenness of the rod surface. The metal dustproof ring 13 is made of high-hardness stainless steel or chrome-plated alloy, and the gap between the inner hole and the locking rod 2 is controlled at 0.02-0.05mm, achieving a rigid seal through surface contact.
[0029] During use, compressed gas enters the positive pressure chamber 11 through the inlet valve 3, forming a stable outward-diffusing airflow field. The dynamic pressure gradient generated by this airflow can counteract the penetrating force of external dust, achieving physical isolation of dust. When the locking rod 2 and the dustproof ring 1 move relative to each other, the annular scraper 12 scrapes away the dust on the locking rod 2, which is equivalent to the self-cleaning of the locking rod 2. Some dust enters the annular scraper 12 and is blocked by the metal dustproof ring 13. At the same time, the positive pressure chamber 11 also has the function of blocking dust. In this way, no matter how the locking rod 2 moves back and forth, dust will not enter the positive pressure chamber 11. The multiple combined sealing rings 14 not only prevent dust from entering the cylinder 4, but also ensure the connection between the positive pressure chamber 11 and the cylinder 4, avoiding pressure imbalance in the cylinder 4. When not in use, the positive pressure chamber 11 does not need to be inflated.
Claims
1. A dust protection structure for a non-lubricated telescopic rod, comprising a cylinder body, a rod body disposed within the cylinder body, wherein the portion of the rod body extending out of the cylinder body serves as a locking rod, characterized in that... A dustproof ring is provided on the locking rod, and a positive pressure chamber is provided inside the dustproof ring. A front sealing assembly and a rear sealing assembly are respectively provided on both sides of the positive pressure chamber, which are closely attached to the locking rod. The front sealing assembly includes an annular scraper and a metal dustproof ring. The annular scraper has a beveled tip, which makes line contact with the locking rod, and the metal dustproof ring makes surface contact with the locking rod.
2. The dust protection structure for a non-lubricated telescopic rod according to claim 1, characterized in that, The dustproof ring is provided with an air inlet valve, which is connected to the positive pressure chamber.
3. The dust protection structure for a non-lubricated telescopic rod according to claim 1, characterized in that, The rear sealing assembly includes at least one combined sealing ring.
4. The dust protection structure for a non-lubricated telescopic rod according to claim 1, characterized in that, The dustproof ring is provided with a scraper groove and a dustproof ring groove for fixing the annular scraper and the metal dustproof ring.
5. The dust protection structure for a non-lubricated telescopic rod according to claim 3, characterized in that, The dustproof ring is provided with a sealing ring groove for fixing the combined sealing ring.
6. The dust protection structure for a non-lubricated telescopic rod according to claim 3, characterized in that, The combined sealing ring is elastic.