Dust cover for mold nitrogen cylinder

Abstract

The utility model provides a dust cover for a mould nitrogen cylinder, which comprises a dust cover main body, a hydraulic rod sleeve and a fixed disc are respectively arranged at two ends of the dust cover main body, and the hydraulic rod sleeve is elastically connected with the fixed disc through a spring; the outer surface and the inner surface of the dust cover main body are respectively provided with a plurality of skin armoring sheets and a plurality of lining armoring sheets, and the skin armoring sheets and the lining armoring sheets are mutually fixed through rivets; the hydraulic rod sleeve is provided with a plurality of sealing rubber rings and a plurality of dust blocking rubber rings. According to the utility model, a protective barrier is constructed through the double armoring sheets, thermal aging is delayed by the high-temperature-resistant low-heat-conduction material, and flexible deformation is ensured by the non-armoring design at the bending part. The hydraulic rod sleeves at the two ends are elastically connected with the fixing disc through springs to absorb movement impact of the piston rod and adapt to displacement changes. The sleeve is in clearance fit with the hydraulic rod, the inner ring dust blocking rubber ring is attached to scrape dust, the sealing rubber ring blocks air impurities, the service life of the nitrogen cylinder is remarkably prolonged through multiple protection, and the fault risk is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of dust cover technology, and in particular relates to a dust cover for a nitrogen cylinder of a mold. Background Technology

[0002] In the working environment of thermoforming molds, the nitrogen cylinder is one of the key components. However, the working environment of its piston rod dust cover is extremely harsh. In the environment of bare thermoforming plates, a large amount of carbon oxide scale is generated, and the ambient temperature is high. Currently, most of the dust protection structures for nitrogen cylinder piston rods widely used in this field adopt flexible cloth dust covers. However, this type of dust cover has many drawbacks and cannot function stably for a long time in the aforementioned harsh environment. Due to the large amount of dust and debris in the working environment, the cloth dust cover is easily corroded and deformed. Once deformed, its original dust protection function will be greatly reduced, and it will not be able to effectively prevent impurities such as carbon oxide scale from entering the nitrogen cylinder. Moreover, the high temperature environment accelerates the aging of the cloth material, making it more susceptible to damage. Frequent replacement of the dust cover not only increases maintenance costs but also reduces production efficiency, seriously affecting the normal operation and service life of the nitrogen cylinder of the thermoforming mold.

[0003] Therefore, it is essential to invent a dust cover for a nitrogen cylinder for a mold. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a dust cover for a nitrogen cylinder in a mold, comprising a dust cover body, a hydraulic rod sleeve, a fixed plate, a spring, a skin armor plate, an inner lining armor plate, rivets, sealing rings, and dust-blocking rings. The hydraulic rod sleeve and the fixed plate are respectively installed at both ends of the dust cover body, and the hydraulic rod sleeve and the fixed plate are elastically connected by a spring. A plurality of skin armor plates and inner lining armor plates are respectively provided on the outer and inner surfaces of the dust cover body, and the skin armor plates and inner lining armor plates are fixed to each other by rivets. A plurality of sealing rings and dust-blocking rings are respectively provided on the upper part of the hydraulic rod sleeve.

[0005] Preferably, the dust cover body is a corrugated telescopic dustproof structure, and the fixing plate fixedly installed at one end of the dust cover body is fixed to the cylinder body of the nitrogen cylinder by fasteners. The outer diameter of the dust cover body is smaller than the outer diameter of the fixing plate, and the inner diameter of the fixing plate is smaller than the inner diameter of the dust cover body.

[0006] Preferably, the inner diameter of the hydraulic rod sleeve fixedly installed at the other end of the dust cover body is fitted with the outer diameter of the hydraulic rod of the nitrogen cylinder with a clearance, wherein the diameter of the several dust-blocking rubber rings vertically distributed on the inner ring of the hydraulic rod sleeve is larger than the clearance between the two.

[0007] Preferably, the hydraulic rod sleeve and the fixed plate have the same inner diameter, and their inner surfaces are respectively fixed to the ends of the spring, with the spring located inside the dust cover body.

[0008] Preferably, the inner and outer inclined surfaces of the dust cover body are covered with skin armor plates and inner lining armor plates, wherein the skin armor plates and inner lining armor plates are not provided on the bent surface of the dust cover body, and the skin armor plates and inner lining armor plates do not interfere with the deformation movement of the bent part of the dust cover body.

[0009] Preferably, the surface of the dust cover body has through holes that allow rivets to pass through, and the skin armor plate and the inner lining armor plate are fixedly installed on the dust cover body by rivets.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] This invention features a skin armor plate and an inner lining armor plate made of high-temperature resistant, low-thermal-conductivity material on the outer and inner surfaces of the dust cover body, respectively, and securely connected by rivets, thus constructing a double protective barrier. The armor plate, with its excellent physical properties, can resist impacts and scratches from sharp objects, preventing damage to the main material, and its low thermal conductivity effectively blocks external high-temperature attacks, significantly delaying the performance degradation of the dust cover due to thermal aging and greatly extending its service life. Furthermore, the absence of armor plates at the bending points of the dust cover body cleverly balances protection and deformation requirements. This allows for more flexible deformation movement, avoiding breakage or damage at the bending points due to the rigidity of the armor plates, ensuring that the dust cover can freely extend, retract, and bend during piston rod movement, maintaining a consistently good protective state.

[0012] The dust cover of this utility model has hydraulic rod sleeves and a fixing plate installed at both ends of its main body, which are elastically connected by springs. The fixing plate is firmly fixed to the cylinder body of the nitrogen cylinder with fasteners, ensuring that the dust cover is securely installed. The springs provide the dust cover with a certain degree of elasticity and cushioning, effectively absorbing vibration and impact during the movement of the nitrogen cylinder piston rod, reducing damage to the dust cover and nitrogen cylinder caused by vibration, and adapting to the slight displacement and angular changes that may occur during the movement of the piston rod, ensuring the stable and long-lasting protective effect of the dust cover.

[0013] This invention employs a clearance fit between the inner diameter of the hydraulic rod sleeve and the outer diameter of the hydraulic rod in the nitrogen cylinder. This ensures smooth reciprocating motion of the hydraulic rod and facilitates the installation of dust-blocking rubber rings. Several dust-blocking rubber rings, vertically distributed on the inner ring of the hydraulic rod sleeve, have a diameter larger than the clearance between the sleeve and the hydraulic rod. When the hydraulic rod moves, these rings tightly adhere to the rod surface, effectively scraping away dust and impurities adhering to the rod and preventing them from entering the nitrogen cylinder. Furthermore, several sealing rubber rings on the hydraulic rod sleeve further enhance the sealing performance, effectively preventing external air, moisture, and fine particles from entering through the gap. This provides comprehensive protection for the internal components of the nitrogen cylinder, significantly extending its service life and reducing the incidence of failures due to contamination. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a half-sectional structural diagram of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure of this utility model without the skin and inner armor plate installed.

[0017] Figure 4 This is a utility model Figure 2 A magnified schematic diagram of the structure at point A.

[0018] In the picture:

[0019] Dust cover body 1, hydraulic rod sleeve 2, fixed plate 3, spring 4, skin armor plate 5, inner lining armor plate 6, rivet 7, sealing ring 8, dustproof ring 9. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for 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. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0022] As attached Figure 1 To be continued Figure 3 As shown:

[0023] This utility model provides a dust cover for a nitrogen cylinder in a mold, comprising a dust cover body 1, a hydraulic rod sleeve 2, a fixing plate 3, a spring 4, a skin armor plate 5, an inner lining armor plate 6, rivets 7, sealing rings 8, and dust-blocking rings 9. The hydraulic rod sleeve 2 and the fixing plate 3 are respectively installed at both ends of the dust cover body 1, and are elastically connected by the spring 4. A plurality of skin armor plates 5 and inner lining armor plates 6 are respectively provided on the outer and inner surfaces of the dust cover body 1, and are fixed to each other by rivets 7. A plurality of sealing rings 8 and dust-blocking rings 9 are respectively provided on the upper part of the hydraulic rod sleeve 2.

[0024] Furthermore, the dust cover body 1 adopts a corrugated telescopic dustproof structure, preferably made of high-strength wear-resistant rubber or modified polyvinyl chloride (PVC), possessing good flexibility and tear resistance. A fixing plate 3, fixedly mounted at one end of the dust cover body 1, is tightly connected to the cylinder flange of the nitrogen cylinder via M8 high-strength bolts and other fasteners, forming a rigid fixing structure. The fixing plate 3 is made of Q235 steel plate, stamped and galvanized. Its outer diameter is 20mm larger than the maximum unfolded outer diameter of the dust cover body 1, while its inner diameter is 15mm smaller than the minimum contracted inner diameter of the dust cover body 1. This dimensional difference design ensures stable support of the fixing plate 3 for the dust cover body 1 and forms an annular dustproof groove, effectively preventing dust accumulation and providing a foundation for the subsequent installation of the spring 4.

[0025] Furthermore, the hydraulic rod sleeve 2, fixedly installed at the other end of the dust cover body 1, is made of aluminum alloy, and its inner diameter forms an H7 / g6 clearance fit with the outer diameter of the hydraulic rod of the nitrogen cylinder. Three dust-blocking rubber rings 9 are evenly distributed axially along the inner ring of the hydraulic rod sleeve 2. The rubber rings are made of fluororubber (FKM), and their cross-sectional diameter is 0.5mm larger than the fit clearance. When the hydraulic rod reciprocates, the dust-blocking rubber rings 9 tightly adhere to the surface of the rod through a lip-shaped structure, achieving dynamic dust scraping and sealing.

[0026] Furthermore, both the hydraulic rod sleeve 2 and the fixed plate 3 adopt the same inner diameter design, and L-shaped spring fixing seats are welded to the inner surfaces of both. The spring 4 is made of spring steel wire, and its two ends are ground flat and then firmly bonded to the fixing seat with epoxy resin. The spring 4 is installed inside the dust cover body 1, providing a 50N preload under compression, which can effectively buffer the impact of piston rod movement and adaptively compensate for the extension and contraction displacement of the dust cover.

[0027] Furthermore, the inner and outer sloping areas (tilt angle 45°) of the dust cover body 1 are covered with a skin armor plate 5 and an inner lining armor plate 6. The skin armor plate 5 is made of stainless steel by stamping, and the surface is sandblasted to enhance adhesion; the inner lining armor plate 6 is made of thick, high-temperature resistant polyetheretherketone (PEEK) sheet. The two armor plates are fixed by evenly spaced stainless steel countersunk rivets 7, and the rivet holes adopt a stepped countersunk hole design. An unarmored area is reserved at the bend to ensure that the dust cover does not interfere with deformation within the bending range.

[0028] Furthermore, the surface of the dust cover body 1 is laser-cut to create an array of through holes, with the hole spacing precisely matching the mounting holes of the armor plates. The skin armor plate 5 and the inner lining armor plate 6 are riveted together using stainless steel countersunk rivets 7. After riveting, the rivet heads are lower than the surface of the armor plates to ensure a smooth overall surface. During assembly, silicone rubber sealant is applied to the contact areas between the rivets and the body material to prevent dust from seeping in along the rivet holes.

[0029] The working principle is as follows: When the piston rod of the nitrogen cylinder extends or retracts, the multiple dust-blocking rubber rings 9 (made of fluororubber with a lip-shaped structure) inside the hydraulic rod sleeve 2 tightly adhere to the surface of the rod body, using an interference fit (the cross-sectional diameter is greater than the gap by 0.5mm) to scrape away the attached dust. At the same time, the sealing rubber rings 8 form a static seal on the inner wall of the sleeve, providing double protection to prevent external impurities from entering the nitrogen cylinder through the gap.

[0030] The corrugated structure of the dust cover body 1 can freely expand and contract with the piston rod stroke, and the high-strength, wear-resistant PVC rubber material ensures that it is not easily damaged by repeated bending. The internal spring 4 (50N preload) is connected to the hydraulic rod sleeve 2 and the fixed plate 3 at both ends, respectively. It absorbs the impact of piston rod movement through elastic deformation and adaptively compensates for the expansion and contraction displacement of the dust cover, avoiding structural damage caused by rigid tension.

[0031] The inner and outer beveled skin armor plate 5 (stainless steel) and inner lining armor plate 6 (PEEK) are fixed together by rivets 7, forming a high-temperature resistant and impact-resistant protective layer to resist external impacts and high-temperature conduction. The unarmored design at the bends ensures that the corrugated structure can be bent freely (within ±90°), avoiding the restriction of deformation by rigid components and achieving a balance between protection and flexibility.

[0032] The annular dustproof groove of the fixed plate 3 (outer diameter 20mm larger than the main body, inner diameter 15mm smaller than the main body) can trap falling dust and reduce accumulation; the silicone rubber sealant between the rivet 7 and the main body prevents dust from seeping in along the rivet hole, and together with the dynamic dust scraping function of the dust-blocking rubber ring, a multi-layer dustproof system is formed to ensure the cleanliness of the inside of the nitrogen cylinder.

[0033] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A dust cover for a nitrogen cylinder in a mold, characterized in that, The dust cover includes a dust cover body (1), a hydraulic rod sleeve (2), a fixing plate (3), a spring (4), a skin armor plate (5), an inner lining armor plate (6), rivets (7), sealing rings (8), and dust-blocking rings (9). The dust cover body (1) is equipped with a hydraulic rod sleeve (2) and a fixing plate (3) at both ends, and the hydraulic rod sleeve (2) and the fixing plate (3) are elastically connected by a spring (4). The outer and inner surfaces of the dust cover body (1) are respectively provided with a number of skin armor plates (5) and inner lining armor plates (6), and the skin armor plates (5) and inner lining armor plates (6) are fixed to each other by rivets (7). The hydraulic rod sleeve (2) is provided with a number of sealing rings (8) and dust-blocking rings (9).

2. The dust cover for a nitrogen cylinder in a mold as described in claim 1, characterized in that: The dust cover body (1) is a corrugated telescopic dustproof structure. The fixed plate (3) fixedly installed at one end of the dust cover body (1) is fixed to the cylinder body of the nitrogen cylinder by fasteners. The outer diameter of the dust cover body (1) is smaller than the outer diameter of the fixed plate (3), and the inner diameter of the fixed plate (3) is smaller than the inner diameter of the dust cover body (1).

3. A dust cover for a nitrogen cylinder in a mold as described in claim 2, characterized in that: The inner diameter of the hydraulic rod sleeve (2) fixedly installed at the other end of the dust cover body (1) is fitted with the outer diameter of the hydraulic rod of the nitrogen cylinder with a clearance. The diameter of the several dust-blocking rubber rings (9) vertically distributed on the inner ring of the hydraulic rod sleeve (2) is larger than the gap between the two.

4. A dust cover for a nitrogen cylinder in a mold as described in claim 3, characterized in that: The hydraulic rod sleeve (2) and the fixed plate (3) have the same inner diameter, and their inner surfaces are respectively fixed to the end of the spring (4). The spring (4) is located inside the dust cover body (1).

5. A dust cover for a nitrogen cylinder in a mold as described in claim 4, characterized in that: The dust cover body (1) is covered with skin armor plates (5) and inner lining armor plates (6) on its inner and outer inclined surfaces. The skin armor plates (5) and inner lining armor plates (6) are not provided on the bent surfaces of the dust cover body (1). The skin armor plates (5) and inner lining armor plates (6) do not interfere with the deformation movement of the bent surfaces of the dust cover body (1).

6. A dust cover for a nitrogen cylinder in a mold as described in claim 5, characterized in that: The dust cover body (1) has through holes on its surface that allow rivets (7) to pass through. The skin armor plate (5) and the inner lining armor plate (6) are fixedly installed on the dust cover body (1) by rivets (7).

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