Dustproof hydraulic cylinder

Abstract

The application provides a dustproof hydraulic oil cylinder and relates to the technical field of excavator oil cylinders. The dustproof hydraulic oil cylinder comprises a cylinder barrel and a cylinder rod, a protective cover which is sleeved on the outside of the cylinder rod, a guide cylinder which is fixedly connected with the cylinder barrel, and a guide column which is fixedly connected with the cylinder rod and connected with the protective cover, and the guide column and the guide cylinder are slidably matched in the extension direction of the oil cylinder. The guide column and the guide cylinder can support and guide the protective cover, and when the oil cylinder extends and retracts, the extension and retraction tracks of the protective cover are guided and limited, so that the protective cover is separated from the cylinder rod as a whole. The dustproof hydraulic oil cylinder avoids the friction and abrasion between the protective cover and the cylinder rod, and ensures the sealing performance and long-term reliability of the oil cylinder.

Description

Technical Field

[0001] This application relates to the field of excavator cylinder technology, and more particularly to a dustproof hydraulic cylinder. Background Technology

[0002] In the field of construction machinery, environments such as tunnel excavation, open-pit mining, and construction sites have extremely high dust concentrations. In these environments, the piston rods (cylinder rods) of hydraulic excavators, cranes, and other equipment are constantly exposed to large amounts of dust particles. Dust can easily enter the cylinder through the sealing gap between the piston rod and the cylinder barrel, causing abnormal wear and aging of the seals, leading to serious malfunctions such as oil leaks, jamming, or even complete cylinder failure. This not only reduces equipment reliability but also significantly increases maintenance costs.

[0003] To address the aforementioned issues, the most common solution in existing technology is to install a corrugated protective cover (also known as a bellows) between the cylinder rod and cylinder barrel of the hydraulic cylinder. This protective cover is typically made of flexible materials such as rubber or plastic, and its two ends are attached to retaining rings at the cylinder rod end and cylinder barrel end respectively via retaining rings or clamps. Utilizing its corrugated structure, the protective cover can expand and contract synchronously with the extension and retraction of the hydraulic cylinder, thus physically forming an isolation barrier that encloses the cylinder rod, blocking most external dust.

[0004] However, for hydraulic cylinders with long stroke characteristics, such as excavator boom cylinders, the aforementioned traditional corrugated protective cover structure has significant limitations. Because the corrugated protective cover itself is made of flexible material, its structural rigidity is poor. During long-stroke extension and retraction, the protective cover is prone to sagging under its own weight, and under the influence of severe mechanical vibrations generated during equipment operation, it will produce uncontrolled swaying or displacement. This causes the sidewalls of the corrugated protective cover to rub and scrape against the surface of the reciprocating cylinder rod. Utility Model Content

[0005] In view of the above problems, this application provides a dustproof hydraulic cylinder to solve the problem that the corrugated protective cover of the hydraulic cylinder in the prior art will rub and scrape against the surface of the reciprocating cylinder rod, which will easily affect the service life of the hydraulic cylinder sealing system.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] This application provides a dustproof hydraulic cylinder, including:

[0008] Cylinder barrel and cylinder rod;

[0009] A protective cover is fitted over the outside of the cylinder rod;

[0010] The guide tube is fixedly connected to the cylinder.

[0011] The guide post is fixedly connected to the cylinder rod and is also connected to the protective cover. The guide post and the guide cylinder can slide relative to each other along the extension and retraction direction of the hydraulic cylinder.

[0012] The guide column, together with the guide cylinder, can support and guide the protective cover. During the extension and retraction movement of the hydraulic cylinder, it guides and restricts the extension and retraction trajectory of the protective cover, so that the protective cover remains separated from the cylinder rod as a whole.

[0013] In one possible implementation, there are multiple guide cylinders, which are circumferentially spaced on the outer peripheral wall of the cylinder.

[0014] There are multiple guide posts, which are spaced circumferentially on the outer peripheral wall of the cylinder rod.

[0015] Furthermore, each guide cylinder and its corresponding guide post can slide relative to each other along the extension and retraction direction of the hydraulic cylinder.

[0016] In one possible implementation, a first fixing ring is fixedly provided at the end of the cylinder barrel, and the first fixing ring is fixedly connected to one end of the guide cylinder; a second fixing ring is fixedly provided at the end of the cylinder rod; a third fixing ring is fixedly provided at the end of the guide post near the second fixing ring, and the third fixing ring is detachably connected to the second fixing ring; a flange ring is provided at the end of the protective cover, the flange ring at one end of the protective cover is detachably connected to the first fixing ring, and the flange ring at the other end of the protective cover is detachably connected to the third fixing ring;

[0017] The first fixed ring has multiple first guide holes, which are arranged opposite to the guide cylinder along the extension and retraction direction of the oil cylinder. The flange ring has multiple second guide holes, and the guide post passes through the second guide holes and the first guide holes and is inserted into the guide cylinder.

[0018] In one possible implementation, the first fixing ring is further provided with a plurality of first threaded holes, which are offset from the plurality of first guide holes in the circumferential direction;

[0019] The flange ring has multiple first through holes, and the multiple first through holes and multiple second guide holes are staggered in the circumferential direction;

[0020] The dustproof hydraulic cylinder also includes a first connecting member, which passes through a first through hole and is threadedly engaged with a first threaded hole.

[0021] In one possible implementation, a third fixing ring is arranged circumferentially around the outer ring of the second fixing ring; the third fixing ring is provided with a plurality of fixing parts that are projected along the extension and retraction direction of the hydraulic cylinder, and one end of the fixing part is at least partially projected onto the end face of the third fixing ring, and the other end of the fixing part is at least partially projected onto the end face of the second fixing ring.

[0022] The second fixed ring has multiple second threaded holes; the fixed part has multiple second through holes; the dustproof hydraulic cylinder also includes a second connecting member, which passes through the second through hole and is threadedly engaged with the second threaded hole;

[0023] The fixed part is also provided with multiple third threaded holes; the dustproof hydraulic cylinder also includes a third connecting member, which passes through the first through hole and is threadedly engaged with the third threaded hole.

[0024] In one possible implementation, the protective cover is segmented, comprising multiple housing segments, each housing segment having flanges at both ends.

[0025] The dustproof hydraulic cylinder also includes a fourth connector; the flanges of two adjacent housing sections are connected by the fourth connector.

[0026] In one possible implementation, a sealing strip is provided between the flange ring of the protective cover and the first retaining ring;

[0027] And / or, a sealing strip is provided between the flange ring of the protective cover and the third retaining ring;

[0028] And / or, a sealing strip is provided between the flanges of two adjacent housing sections.

[0029] In one possible implementation, a fourth fixing ring is also fixedly installed on the cylinder, and the fourth fixing ring is fixedly connected to the other end of the guide cylinder.

[0030] In one possible implementation, the rated stroke of the guide post within the guide tube is greater than or equal to the rated stroke of the cylinder rod within the cylinder.

[0031] In one possible implementation, the protective cover is made of non-woven fabric.

[0032] The dustproof hydraulic cylinder provided in this application features a guide cylinder that provides a fixed and robust guiding reference for the guide column. The inner hole of the guide cylinder serves as a sliding track for the guide column, constraining its movement trajectory. The guide column moves synchronously with the extension and retraction of the cylinder rod, forming a rigid structure that acts as a dynamic skeleton for the protective cover (especially for long-stroke cylinders, the guide column provides continuous rigid support throughout the entire stroke, solving the problem of mid-section sagging). This prevents the protective cover from contacting the cylinder rod due to its own weight and vibration, avoiding frictional wear between the protective cover and the cylinder rod, and ensuring the sealing performance and long-term reliability of the cylinder. The guide column and guide cylinder can slide relative to each other along the extension and retraction direction of the cylinder, providing precise trajectory constraints for the extension and retraction of the protective cover. This absorbs lateral forces or vibrations that may cause the protective cover to wobble. During long strokes or severe mechanical vibrations, the protective cover will not undergo spiral twisting, lateral swaying, or local collapse, maintaining its shape and position stability. This allows it to adapt to harsh working conditions involving high-speed extension and retraction and high vibration frequencies. Stable motion ensures a uniform gap between the protective cover and the cylinder rod, avoiding the risk of seal failure caused by local compression or excessive stretching of the protective cover, and better ensuring the dustproof effect of the protective cover.

[0033] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the dustproof hydraulic cylinder provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A perspective view of a dustproof hydraulic cylinder provided in an embodiment of this application;

[0036] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0037] Figure 3 for Figure 1 A partial cross-sectional view of the dustproof hydraulic cylinder shown;

[0038] Figure 4 for Figure 3A partial sectional view at point B in the middle;

[0039] Figure 5 for Figure 3 A magnified view of a portion of point C in the middle;

[0040] Figure 6 for Figure 3 A magnified view of a portion of point D in the middle;

[0041] Figure 7 for Figure 1 A perspective view of the casing section of the dustproof hydraulic cylinder shown in the figure;

[0042] Figure 8 for Figure 1 A perspective view of the dustproof hydraulic cylinder's guide post assembled with multiple third fixing rings.

[0043] Figure 9 for Figure 4 A schematic diagram of the first guide hole and the second guide hole.

[0044] Explanation of reference numerals in the attached figures:

[0045] 10. Cylinder barrel; 11. First retaining ring; 111. First guide hole; 112. First threaded hole; 12. Fourth retaining ring; 20. Cylinder rod; 21. Second retaining ring; 211. Second threaded hole; 30. Protective cover; 301. Cover section; 31. Flange ring; 311. Second guide hole; 312. First through hole; 40. Guide cylinder; 50. Guide post; 51. Third retaining ring; 511. Fixing part; 512. Second through hole; 513. Third threaded hole; 61. First connecting piece; 62. Second connecting piece; 63. Third connecting piece; 64. Fourth connecting piece; 70. Sealing strip; Y, telescopic direction. Detailed Implementation

[0046] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0047] Secondly, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0048] As described in the background art, the hydraulic cylinder in the related art has a problem where the corrugated protective cover rubs and scrapes against the surface of the reciprocating hydraulic cylinder rod, which can easily affect the service life of the hydraulic cylinder sealing system. The inventors have found that the reason for this problem is that the corrugated protective cover (especially for long-stroke hydraulic cylinders) is prone to contact with the cylinder rod due to its own weight or mechanical vibration.

[0049] To address the aforementioned technical problems, this application provides a dustproof hydraulic cylinder, comprising: a cylinder barrel and a cylinder rod; a protective cover fitted over the cylinder rod; a guide cylinder fixedly connected to the cylinder barrel; and a guide post fixedly connected to the cylinder rod, and connected to the protective cover. The guide post and the guide cylinder can slide relative to each other along the extension and retraction direction of the cylinder. The guide post and the guide cylinder can support and guide the protective cover, guiding and limiting the extension and retraction trajectory of the protective cover during the extension and retraction movement of the cylinder, so that the protective cover remains separated from the cylinder rod as a whole.

[0050] The dustproof hydraulic cylinder provided in this application features a guide cylinder that provides a fixed and robust guiding reference for the guide column. The inner hole of the guide cylinder serves as a sliding track for the guide column, constraining its movement trajectory. The guide column moves synchronously with the extension and retraction of the cylinder rod, forming a rigid structure that acts as a dynamic skeleton for the protective cover (especially for long-stroke cylinders, the guide column provides continuous rigid support throughout the entire stroke, solving the problem of mid-section sagging). This prevents the protective cover from contacting the cylinder rod due to its own weight and vibration, avoiding frictional wear between the protective cover and the cylinder rod, and ensuring the sealing performance and long-term reliability of the cylinder. The guide column and guide cylinder can slide relative to each other along the extension and retraction direction of the cylinder, providing precise trajectory constraints for the extension and retraction of the protective cover. This absorbs lateral forces or vibrations that may cause the protective cover to wobble. During long strokes or severe mechanical vibrations, the protective cover will not undergo spiral twisting, lateral swaying, or local collapse, maintaining its shape and position stability. This allows it to adapt to harsh working conditions involving high-speed extension and retraction and high vibration frequencies. Stable motion ensures a uniform gap between the protective cover and the cylinder rod, avoiding the risk of seal failure caused by local compression or excessive stretching of the protective cover, and better ensuring the dustproof effect of the protective cover.

[0051] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application 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 application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0052] Please refer to the attached document. Figure 1-9 This application provides a dustproof hydraulic cylinder, comprising:

[0053] Cylinder barrel 10 and cylinder rod 20;

[0054] The protective cover 30 is fitted over the outside of the cylinder rod 20;

[0055] Guide cylinder 40 is fixedly connected to cylinder 10;

[0056] The guide post 50 is fixedly connected to the cylinder rod 20, and the guide post 50 is connected to the protective cover 30. The guide post 50 and the guide cylinder 40 can slide relative to each other along the extension and retraction direction Y of the oil cylinder.

[0057] The guide column 50, together with the guide cylinder 40, can support and guide the protective cover 30. During the extension and retraction movement of the hydraulic cylinder, it guides and restricts the extension and retraction trajectory of the protective cover 30, so that the protective cover 30 remains separated from the cylinder rod 20 as a whole.

[0058] In this embodiment, the cylinder rod 20 is inserted into the cylinder barrel 10, and the cylinder rod 20 and the cylinder barrel 10 are slidably engaged relative to each other along the extension and retraction direction Y of the hydraulic cylinder. A protective cover 30 is fitted over the cylinder rod 20. The protective cover 30 has a corrugated structure and can expand and contract synchronously with the extension and retraction movement of the hydraulic cylinder, thereby physically forming an isolation barrier that encloses the cylinder rod 20, thus preventing dust from entering the interior of the hydraulic cylinder.

[0059] The dustproof hydraulic cylinder provided in this application has a guide cylinder 40 fixedly connected to the cylinder barrel 10. The guide cylinder 40 is arranged along the extension and retraction direction Y of the cylinder. The guide cylinder 40 provides a fixed and robust guide reference for the guide column 50. The inner hole of the guide cylinder 40 serves as the sliding track of the guide column 50, constraining the movement trajectory of the guide column 50. The guide column 50 is fixedly connected to the cylinder rod 20. The guide column 50 moves synchronously with the extension and retraction of the cylinder rod 20. The guide column 50 itself constitutes a rigid structure, becoming a dynamic skeleton on which the protective cover 30 can attach (especially for long-stroke cylinders, the guide column 50 provides continuous rigid support for the protective cover 30 throughout its stroke, solving the problem of mid-section sagging). This prevents the protective cover 30 from contacting the cylinder rod 20 due to its own weight and vibration, avoids friction and wear between the protective cover 30 and the cylinder rod 20, and ensures the sealing performance and long-term reliability of the cylinder. The guide post 50 and guide cylinder 40 can slide relative to each other along the extension and retraction direction Y of the hydraulic cylinder, providing precise trajectory constraints for the extension and retraction of the protective cover 30. This absorbs lateral forces or vibrations that may cause the protective cover 30 to wobble. During long strokes or severe mechanical vibrations, the protective cover 30 will not undergo spiral twisting, lateral swaying, or local collapse, maintaining its shape and position stability at all times. This allows it to adapt to harsh working conditions of high-speed extension and retraction and high vibration frequency. Stable movement ensures a uniform gap between the protective cover 30 and the cylinder rod 20, avoiding the risk of seal failure caused by local compression or excessive stretching of the protective cover 30, and better ensuring the dustproof effect of the protective cover 30.

[0060] In one possible implementation, there are multiple guide cylinders 40, which are circumferentially spaced on the outer peripheral wall of the cylinder 10.

[0061] There are multiple guide posts 50, which are circumferentially spaced on the outer peripheral wall of the cylinder rod 20.

[0062] Furthermore, each guide cylinder 40 and its corresponding guide post 50 can slide relative to each other along the extension and retraction direction Y of the hydraulic cylinder.

[0063] In this embodiment, multiple guide cylinders 40 and multiple guide posts 50 form multiple guide pairs. The guide post 50 and guide cylinder 40 of each guide pair can slide relative to each other along the extension / retraction direction Y of the hydraulic cylinder. On one hand, the multiple guide pairs are circumferentially spaced, thus forming a stable supporting circumferential surface. This ensures that even under long-stroke, high-vibration conditions, the protective cover 30 remains concentric with the cylinder rod 20, resulting in smoother movement and avoiding the risk of jamming due to structural deformation. On the other hand, the circumferentially spaced guide pairs ensure that any force attempting to twist or non-axially swing the protective cover 30 is immediately resisted by at least two guide pairs. This strictly limits the extension / retraction trajectory of the protective cover 30, preventing spiral twisting or lateral swaying, maintaining a uniform dustproof gap, and greatly improving reliability. Furthermore, the self-weight, inertial force, and accidental external impact forces of the protective cover 30 are evenly distributed across the multiple guide pairs. This not only reduces the stress at each connection point and extends the life of components, but also reduces the over-reliance on the structural rigidity of the cylinder 10 fixed point, making the overall design more robust and durable.

[0064] Furthermore, multiple guide cylinders 40 are evenly arranged around the outer peripheral wall of the cylinder barrel 10; multiple guide pillars 50 are evenly arranged around the outer peripheral wall of the cylinder rod 20, thereby optimizing the force distribution and improving the rigidity and durability of the system.

[0065] In one possible implementation, please see Figure 3 and Figure 4 As shown, a first fixing ring 11 is fixedly provided at the end of the cylinder 10, and the first fixing ring 11 is fixedly connected to one end of the guide cylinder 40; please refer to Figure 2 and Figure 5 As shown, a second retaining ring 21 is fixedly provided at the end of the cylinder rod 20; please refer to Figure 2 and Figure 8 As shown, a third fixing ring 51 is fixedly installed at one end of the guide post 50 near the second fixing ring 21, and the third fixing ring 51 is detachably connected to the second fixing ring 21; please refer to Figure 4 and Figure 5As shown, a flange ring 31 is provided at the end of the protective cover 30. The flange ring 31 at one end of the protective cover 30 is detachably connected to the first fixing ring 11, and the flange ring 31 at the other end of the protective cover 30 is detachably connected to the third fixing ring 51.

[0066] Please see Figure 9 As shown, the first fixed ring 11 has multiple first guide holes 111. The first guide holes 111 and the guide cylinder 40 are arranged opposite to each other along the extension and retraction direction Y of the oil cylinder. The flange ring 31 has multiple second guide holes 311. The guide post 50 passes through the second guide holes 311 and the first guide holes 111 and is inserted into the guide cylinder 40.

[0067] In this embodiment, the first fixing ring 11 provides a unified mounting base for the guide cylinder 40 and the protective cover 30; the second fixing ring 21 provides a mounting surface for the third fixing ring 51 connecting the guide post 50. On one hand, the third fixing ring 51 integrates with multiple guide posts 50 into a single component by fixing them together; on the other hand, the third fixing ring 51, through a detachable connection with the second fixing ring 21, securely mounts the guide post 50 onto the cylinder rod 20, ensuring synchronized movement; furthermore, the third fixing ring 51 can serve as the mounting base for the movable end of the protective cover 30, directly bearing the weight and tension of the protective cover 30. By providing a flange ring 31 at the end of the protective cover 30, the flexible port of the protective cover 30 is strengthened into a rigid connection interface (flange ring 31) with mounting holes. This allows the protective cover 30 to be reliably connected to the first fixing ring 11 and the second fixing ring 21 via bolts or other fasteners, ensuring effective transmission of force and movement, rather than relying solely on the clamping force of the material.

[0068] In this embodiment, by opening a first guide hole 111 on the first fixing ring 11, each first guide hole 111 is coaxial with the corresponding guide cylinder 40, thereby precisely defining the entry position of the guide post 50, ensuring that the guide post 50 can be accurately aligned and slide into the guide cylinder 40, and preventing deviation during the initial stage. By opening a second guide hole 311 on the flange ring 31, the guide post 50 passes through the second guide hole 311 and the first guide hole 111 and is inserted into the guide cylinder 40, ensuring that the force point and movement guide point of the protective cover 30 are completely located on the rigid frame composed of the guide post 50 and the first fixing ring 11, thereby realizing the direct driving and support of the protective cover 30 by the guide post 50, and thus realizing that the protective cover 30 as a whole remains separated from the cylinder rod 20, with a highly reliable non-contact effect.

[0069] In this embodiment, the third fixing ring 51 and the second fixing ring 21, as well as the flange ring 31 of the protective cover 30 and the first fixing ring 11 and the second fixing ring 21, are detachably connected (such as bolted connections) to achieve modular assembly, which facilitates disassembly and maintenance.

[0070] Furthermore, one end of the cylinder barrel 10 is provided with an insertion port, through which the cylinder rod 20 is inserted into the cylinder barrel 10. A first retaining ring 11 is fixedly disposed at one end of the cylinder barrel 10 near the insertion port. One end of the cylinder rod 20 is inserted into the cylinder barrel 10, and a second retaining ring 21 is fixedly disposed at the other end. The two ends of the protective cover 30 are detachably connected to the first retaining ring 11 and the second retaining ring 21 respectively through flange rings 31, thereby driving the protective cover 30 through the first retaining ring 11 and the second retaining ring 21, so that the protective cover 30 can extend and retract synchronously with the extension and retraction of the hydraulic cylinder.

[0071] Furthermore, the first retaining ring 11 can be fixed to the end of the cylinder 10 by welding. The second retaining ring 21 can be fixed to the end of the cylinder rod 20 by welding. The third retaining ring 51 is welded to the multiple guide posts 50 to form an integral structure.

[0072] In one possible implementation, please see Figure 4 As shown, the first fixing ring 11 is also provided with a plurality of first threaded holes 112, and the plurality of first threaded holes 112 and the plurality of first guide holes 111 are offset in the circumferential direction;

[0073] The flange ring 31 has multiple first through holes 312, and the multiple first through holes 312 and multiple second guide holes 311 are staggered in the circumferential direction;

[0074] The dustproof hydraulic cylinder also includes a first connecting member 61, which passes through the first through hole 312 and is threadedly engaged with the first threaded hole 112.

[0075] In this embodiment, a plurality of first threaded holes 112 are formed on the first fixing ring 11. The first connecting member 61 passes through the first through hole 312 and is threaded into the first threaded hole 112. By tightening the first connecting member 61, a strong axial clamping force is generated, which tightly presses the flange ring 31 onto the first fixing ring 11. The plurality of first threaded holes 112 and the plurality of first guide holes 111 are staggered in the circumferential direction, thereby spatially separating the function of guiding / positioning (first guide holes 111) and the function of fastening / connection (first threaded holes 112). This avoids the two functions interfering with each other in the same hole position.

[0076] During assembly, the second guide hole 311 on the flange ring 31 is first fitted onto the guide post 50. The guide post 50 passes through the second guide hole 311 and the first guide hole 111 and is inserted into the guide cylinder 40. At the same time, the first through hole 312 on the flange ring 31 will naturally align with the first threaded hole 112 on the first fixing ring 11. In this process, the guide post 50 and the first guide hole 111 play the main radial positioning role, automatically completing the precise alignment of all connecting holes, thereby improving assembly accuracy and efficiency. After positioning is completed, the first connecting piece 61 passes through the first through hole 312 and engages with the first threaded hole 112, and is then tightened.

[0077] During maintenance, simply unscrew the first connector 61, and the entire protective cover 30 can be easily removed along the "track" of the guide post 50. After replacing the protective cover, it can be quickly and accurately positioned and installed using the guide post 50, which helps reduce maintenance workload and time costs.

[0078] Furthermore, the first connector 61 can be a screw.

[0079] In one possible implementation, please see Figure 2 and Figure 5 As shown, the third fixing ring 51 is arranged circumferentially around the outer ring of the second fixing ring 21; the third fixing ring 51 is provided with a plurality of fixing parts 511, which are projected along the extension and retraction direction Y of the oil cylinder. At least one radial end of the fixing part 511 is projected onto the end face of the third fixing ring 51, and at least one other end of the fixing part 511 is projected onto the end face of the second fixing ring 21.

[0080] The second fixed ring 21 has a plurality of second threaded holes 211; the fixed part 511 has a plurality of second through holes 512; the dustproof hydraulic cylinder also includes a second connecting member 62, which passes through the second through hole 512 and is threadedly engaged with the second threaded hole 211.

[0081] The fixing part 511 is also provided with a plurality of third threaded holes 513; the dustproof hydraulic cylinder also includes a third connecting member 63, which passes through the first through hole 312 and is threadedly engaged with the third threaded hole 513.

[0082] In this embodiment, the third fixing ring 51 is arranged circumferentially around the outer ring of the second fixing ring 21. During assembly, the third fixing ring 51 and the second fixing ring 21 are installed concentrically, ensuring that the installation position of the guide post 50 is consistent with the axis of the cylinder rod 20, thereby providing a precise reference for the entire guide pair. The surrounding design of the third fixing ring 51 increases the distribution space of the fixing part 511, facilitating multi-point and multi-angle fixing and enhancing overall stability. At least one radial end of the fixing part 511 is projected onto the end face of the third fixing ring 51, and at least one end of the fixing part 511 is projected onto the end face of the second fixing ring 21, making the fixing part 511 a "bridge" for force transmission. This allows the fixing part 511 to simultaneously bear the loads from the third fixing ring 51 and the second fixing ring 21, ensuring that the connection point is located on the force path and reducing local stress.

[0083] In this embodiment, multiple second threaded holes 211 are distributed on the second fixing ring 21, and multiple second through holes 512 are distributed on the fixing part 511. The second connecting member 62 passes through the second through hole 512 and is threadedly engaged with the second threaded hole 211 to generate a preload, pressing the third fixing ring 51 tightly against the second fixing ring 21. This detachable connection method not only ensures the rigidity of the connection but also facilitates disassembly and maintenance. Multiple third threaded holes 513 are also provided on the fixing part 511, providing another threaded connection point specifically for fixing the flange ring 31 of the protective cover 30. The third connecting member 63 passes through the first through hole 312 and is threadedly engaged with the third threaded hole 513, thereby firmly fixing the protective cover 30 to the third fixing ring 51. This achieves the connection between the movable end of the protective cover 30 and the guide post 50, ensuring synchronized movement.

[0084] In this embodiment, the flange 31 at one end of the protective cover 30 is connected to the first fixing ring 11 via the first connector 61, and the third fixing ring 51 is connected to the second fixing ring 21 via the third connector 63. The flange 31 at the other end of the protective cover 30 is connected to the third fixing ring 51 via the second connector 62. During maintenance, if the protective cover 30 needs to be replaced, simply disassemble the first connector 61 and the third connector 63 to remove the entire structure of the third fixing ring 51 and the guide post 50, along with the protective cover 30, from the first fixing ring 11 and the second fixing ring 21. Then, disassemble the second connector 62 to remove the protective cover 30 from the third fixing ring 51. This modular design minimizes maintenance workload, improves operational efficiency, and reduces the risk of incorrect assembly.

[0085] Furthermore, both the second connector 62 and the third connector 63 are screws.

[0086] In one possible implementation, please see Figure 1 and Figure 6As shown, the protective cover 30 is segmented, and the protective cover 30 includes multiple cover segments 301, with flange rings 31 provided at both ends of each cover segment 301;

[0087] The dustproof hydraulic cylinder also includes a fourth connector 64; the flanges 31 of two adjacent cover sections 301 are connected by the fourth connector 64.

[0088] In this embodiment, the protective cover 30 is segmented. When a segment of the protective cover 30 is damaged due to accidental impact, excessive wear, or material aging, it is not necessary to replace the entire protective cover 30. Only the fourth connecting member 64 connecting the damaged portion to the adjacent portion needs to be disassembled to remove the damaged section 301 individually. A new section 301 can then be installed and tightened again, which helps reduce maintenance costs. By connecting multiple sections 301, different stroke cylinders can be adapted through combination, eliminating the need to reserve a complete protective cover for each cylinder specification, thus reducing costs and management complexity. Furthermore, each section 301 has flange rings 31 at both ends. The flange rings 31 of adjacent sections 301 are connected by the fourth connecting member 64. During connection, each flange ring 31 is passed through and supported by the guide post 50. This means that each cover section 301 has multiple rigid support points at both ends, which greatly improves the anti-sag capability and overall rigidity of the long-stroke protective cover, ensuring that it always maintains a safe distance from the cylinder rod during the extension and retraction process, and reducing wear caused by shaking and friction.

[0089] Furthermore, the fourth connector 64 can be a rivet.

[0090] In one possible implementation, please see Figure 4 As shown, a sealing strip 70 is provided between the flange ring 31 of the protective cover 30 and the first fixing ring 11;

[0091] And / or, please see Figure 5 As shown, a sealing strip 70 is provided between the flange ring 31 and the third fixing ring 51 of the protective cover 30;

[0092] And / or, please see Figure 5 As shown, a sealing strip 70 is provided between the flange rings 31 of two adjacent cover sections 301.

[0093] In this embodiment, sealing strips 70 are provided between the flange ring 31 and the first fixing ring 11 of the protective cover 30, between the flange ring 31 and the third fixing ring 51 of the protective cover 30, and between the flange rings 31 of two adjacent cover sections 301. From the fixed end (to the cylinder 10) to the movable end (to the cylinder rod 20) of the protective cover 30, and then to the sections inside, the sealing strips 70 form a continuous, seamless sealing network. Through their elastic deformation, the sealing strips 70 actively press against the contact surface, effectively improving the reliability of dust prevention.

[0094] Furthermore, the sealing strip 70 is an annular sealing strip.

[0095] In one possible implementation, please see Figure 1 As shown, a fourth fixing ring 12 is also fixedly installed on the cylinder 10, and the fourth fixing ring 12 is fixedly connected to the other end of the guide cylinder 40.

[0096] In this embodiment, a fourth fixing ring 12 is fixedly installed on the cylinder 10, which, together with the first fixing ring 11, fixes both ends of the guide cylinder 40. This ensures that the guide cylinder 40 maintains a high degree of straightness throughout its movement, allowing the guide column 50 to slide smoothly and without obstruction. This ensures that the extension and retraction of the protective cover 30 is more stable and smooth, avoiding problems such as jamming and abnormal noise that may occur due to deformation of the guide pair. In complex working conditions such as tunnels and mines, the protective cover 30 may be accidentally bumped or squeezed by materials. The double-ended fixed guide cylinder 40 can effectively disperse such accidental impact forces to the two fixed points of the cylinder 10, preventing permanent deformation or damage to the guide pair and improving the robustness of the equipment in harsh environments.

[0097] Furthermore, the fourth fixing ring 12 and the guide cylinder 40 can be fixed by welding.

[0098] In one possible implementation, the rated stroke of the guide post 50 within the guide cylinder 40 is greater than or equal to the rated stroke of the cylinder rod 20 within the cylinder barrel 10.

[0099] It should be noted that the rated stroke of the cylinder rod 20 within the cylinder barrel 10 refers to the maximum distance the cylinder rod 20 can move within the cylinder barrel 10 from fully retracted to fully extended. The rated stroke of the guide post 50 within the guide cylinder 40 refers to the maximum distance the guide post 50 can slide within the guide cylinder 40.

[0100] In this embodiment, the rated stroke of the guide post 50 within the guide cylinder 40 is greater than or equal to the rated stroke of the cylinder rod 20 within the cylinder barrel 10. Therefore, no matter where the cylinder moves (fully retracted, fully extended, or any point in between), the guide post 50 will never collide with the end cap of the guide cylinder 40. There is always a safety margin between them to prevent impact and damage caused by overtravel and to ensure the lifespan of the guide pair itself.

[0101] Furthermore, after the cylinder rod 20 is fully retracted, the end of the guide post 50 remains within the length range of the guide cylinder 40, ensuring that the guide post 50 is protected to the maximum extent.

[0102] In one possible implementation, the protective cover 30 is made of non-woven fabric.

[0103] In this embodiment, the protective cover 30 is made of non-woven fabric, which enables the protective cover 30 to effectively intercept dust particles while allowing air circulation. This ensures the breathability of the protective cover 30 and improves the dustproof effect, reducing the risk of dust entering the oil cylinder.

[0104] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0105] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A dustproof hydraulic cylinder, characterized in that, include: Cylinder barrel and cylinder rod; A protective cover is fitted over the outside of the cylinder rod; The guide cylinder is fixedly connected to the cylinder barrel; The guide post is fixedly connected to the cylinder rod and is also connected to the protective cover. The guide post and the guide cylinder can slide relative to each other along the extension and retraction direction of the hydraulic cylinder. The guide post, in conjunction with the guide cylinder, can support and guide the protective cover. During the extension and retraction movement of the hydraulic cylinder, it guides and restricts the extension and retraction trajectory of the protective cover, keeping the protective cover as a whole separate from the cylinder rod.

2. The dustproof hydraulic cylinder according to claim 1, characterized in that, The number of guide cylinders is multiple, and the multiple guide cylinders are arranged circumferentially at intervals on the outer peripheral wall of the cylinder. The number of guide posts is multiple, and the multiple guide posts are arranged circumferentially at intervals on the outer peripheral wall of the cylinder rod; Furthermore, each of the guide cylinders and the corresponding guide post can slide relative to each other along the extension and retraction direction of the hydraulic cylinder.

3. The dustproof hydraulic cylinder according to claim 2, characterized in that, A first fixing ring is fixedly provided at the end of the cylinder barrel, and the first fixing ring is fixedly connected to one end of the guide cylinder; a second fixing ring is fixedly provided at the end of the cylinder rod; a third fixing ring is fixedly provided at the end of the guide post near the second fixing ring, and the third fixing ring is detachably connected to the second fixing ring; a flange ring is provided at the end of the protective cover, the flange ring at one end of the protective cover is detachably connected to the first fixing ring, and the flange ring at the other end of the protective cover is detachably connected to the third fixing ring; The first fixed ring has multiple first guide holes, which are arranged opposite to the guide cylinder along the extension and retraction direction of the oil cylinder. The flange ring has multiple second guide holes, and the guide post passes through the second guide holes and the first guide holes and is inserted into the guide cylinder.

4. The dustproof hydraulic cylinder according to claim 3, characterized in that, The first fixing ring is also provided with a plurality of first threaded holes, which are offset from the plurality of first guide holes in the circumferential direction; The flange ring is provided with a plurality of first through holes, and the plurality of first through holes and the plurality of second guide holes are offset in the circumferential direction; The dustproof hydraulic cylinder also includes a first connecting member, which passes through the first through hole and is threadedly engaged with the first threaded hole.

5. The dustproof hydraulic cylinder according to claim 4, characterized in that, The third fixing ring is arranged circumferentially around the outer ring of the second fixing ring; the third fixing ring is provided with a plurality of fixing parts, which are projected along the extension and retraction direction of the oil cylinder, and one end of the fixing part is at least partially projected on the end face of the third fixing ring, and the other end of the fixing part is at least partially projected on the end face of the second fixing ring. The second fixing ring has multiple second threaded holes; the fixing part has multiple second through holes; the dustproof hydraulic cylinder also includes a second connecting member, which passes through the second through hole and is threadedly engaged with the second threaded hole; The fixing part is also provided with a plurality of third threaded holes; the dustproof hydraulic cylinder also includes a third connecting member, which passes through the first through hole and is threadedly engaged with the third threaded hole.

6. The dustproof hydraulic cylinder according to claim 3, characterized in that, The protective cover is segmented, and the protective cover includes multiple shell segments, with flange rings provided at both ends of each shell segment; The dustproof hydraulic cylinder also includes a fourth connecting member; the flanges of two adjacent cover sections are connected by the fourth connecting member.

7. The dustproof hydraulic cylinder according to claim 6, characterized in that, A sealing strip is provided between the flange ring of the protective cover and the first fixing ring; And / or, a sealing strip is provided between the flange ring of the protective cover and the third fixing ring; And / or, a sealing strip is provided between the flanges of two adjacent housing sections.

8. The dustproof hydraulic cylinder according to claim 3, characterized in that, A fourth fixing ring is also fixedly installed on the cylinder, and the fourth fixing ring is fixedly connected to the other end of the guide cylinder.

9. The dustproof hydraulic cylinder according to claim 1, characterized in that, The rated stroke of the guide post within the guide cylinder is greater than or equal to the rated stroke of the cylinder rod within the cylinder.

10. The dustproof hydraulic cylinder according to any one of claims 1-9, characterized in that, The protective cover is made of non-woven fabric.

Images