Hydraulic dam cylinder arrangement

Abstract

The application belongs to the technical field of hydraulic cylinders, and particularly relates to a hydraulic dam hydraulic cylinder device, which comprises a cylinder body, a piston rod and a protection structure for sealing and protecting between the cylinder body and the piston rod; the protection structure comprises a sand cleaning part and a flushing part; the sand cleaning part is used for cleaning the sand on the surface of the piston rod when the piston rod is retracted; the flushing part is used for flushing the residual sand on the surface of the piston rod when the piston rod is retracted, and cooperates with the sand cleaning part to clean the surface of the piston rod; the sand cleaning part and the flushing part constitute a two-stage cleaning mode, that is, mechanical scraping is performed first and then hydraulic flushing is performed, so that the sand adhered to the surface of the piston rod can be cleaned, meanwhile, the flushing part is integrated with a self-rotation function to realize dead-angle-free flushing, and the abrasion of the sand to the sealing structure of the cylinder body is reduced.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder technology, and more particularly to a hydraulic cylinder device for a hydraulic dam. Background Technology

[0002] Hydraulic cylinders are the core actuators of hydraulic dams. Since hydraulic dams are located in river or reservoir environments year-round, the water usually contains a large amount of silt, fine gravel, and suspended particles. When the piston rod extends under the drive of the hydraulic cylinder and is exposed to the external water, a layer of silt mixture easily adheres to its outer surface.

[0003] Hydraulic cylinders in the prior art typically have a dust seal at the end of the cylinder body to scrape off impurities on the piston rod surface when it retracts. However, the traditional sludge scraping structure has the following significant drawbacks: during the long-term reciprocating motion of the piston rod, these hard particles will continuously scrape the working lip of the sealing ring (such as a lip seal) and the chrome-plated surface of the piston rod, causing severe wear and elasticity failure of the sealing ring, which in turn leads to external leakage of hydraulic oil. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a hydraulic cylinder device for a hydraulic dam, which uses a protective structure to clean mud and sand, preventing mud and sand from wearing down the sealing ring, thereby solving the problems in the prior art.

[0005] To achieve the above-mentioned technical objectives, the specific technical solution of the present invention is as follows: The present invention proposes a hydraulic cylinder device for a hydraulic dam, comprising a cylinder body, a piston rod, and a protective structure for sealing and protecting the cylinder body and the piston rod; the protective structure comprises: a sand-cleaning component for cleaning the mud and sand on the surface of the piston rod when it retracts; and a flushing component for flushing the surface of the piston rod when it retracts, and cooperating with the sand-cleaning component to flush the surface of the piston rod.

[0006] As a preferred embodiment of the present invention, the sand-cleaning component includes an annular scraper with a gap between the scraper and the piston rod. The inner wall of the scraper is conical and its inner diameter gradually increases along the retraction direction of the piston rod, so that the gap between the piston rod and the scraper gradually increases when the piston rod retracts.

[0007] As a preferred embodiment of the present invention, the scraper is provided with an annular seat around its periphery and a baffle is provided at the end of the scraper.

[0008] As a preferred embodiment of the present invention, the rinsing component includes an annular housing and a rotating seat that is rotatably and sealed within the housing. The interior of the rotating seat is in communication with the interior of the housing, and a plurality of nozzles are uniformly arranged on the inner wall of the rotating seat along its axial direction.

[0009] As a preferred embodiment of the present invention, the nozzle is provided with a first spray hole and a second spray hole, the first spray hole spraying in a direction perpendicular to the piston rod axis, and the second spray hole facing the gap between the piston rod and the scraper.

[0010] As a preferred embodiment of the present invention, the spray direction of the second nozzle is deviated from the piston rod axis, so that when the nozzle sprays water, it drives the rotating seat to rotate automatically.

[0011] As a preferred embodiment of the present invention, the protective structure further includes a sealing seat and a connecting seat. The sealing seat is used to seal between the cylinder body and the piston rod; the connecting seat is used to fix the cylinder body in place; the sand cleaning component, the flushing component, and the sealing seat are all fixedly installed in the connecting seat and arranged sequentially along the piston rod retraction direction.

[0012] As a preferred embodiment of the present invention, a water-blocking ring is provided between the flushing component and the sealing seat, and the water-blocking ring is provided with a plurality of drainage holes.

[0013] As a preferred embodiment of the present invention, a pair of lip-shaped sealing rings are symmetrically installed on the inner wall of the sealing seat, wherein the outer sealing ring lip faces outward and the inner sealing ring lip faces inward, an elastic ring is installed on the sealing ring, and a first O-ring is also installed on the inner wall of the sealing seat between the two sealing rings.

[0014] As a preferred embodiment of the present invention, a second O-ring is installed on the outer wall of the sealing seat for sealing between the outer wall of the sealing seat and the inner wall of the cylinder, and a sealing gasket is also installed on the outer wall of the sealing seat for sealing between the outer wall of the sealing seat and the end face of the cylinder.

[0015] The beneficial effects of this invention are as follows: 1. This invention constructs a two-stage cleaning mode of "mechanical scraping followed by hydraulic rinsing" by setting up a sand-cleaning component and a rinsing component arranged sequentially along the piston rod retraction direction. First, the annular scraper in the sand-cleaning component can perform preliminary mechanical scraping of large particles of mud and sand and attached substances when the piston rod retracts. Second, the rinsing component sprays high-pressure water jets through nozzles to perform secondary rinsing of fine mud and sand and residual "mud skin" that the scraper failed to clean. The two work together to improve the surface cleanliness of the piston rod before entering the sealing area, avoiding the possibility of mud and sand entering the cylinder body.

[0016] 2. The present invention designs the inner wall of the scraper to be conical, and its inner wall diameter gradually increases along the retraction direction of the piston rod, so that a gradually expanding gap is formed between the piston rod and the scraper. When the piston rod retracts, the gap between the scraper and the piston rod increases from small to large, avoiding the problems of mud and sand accumulation, jamming or even scratching the surface of the piston rod due to the gap being too small or sudden. While ensuring the sand cleaning effect, it protects the chromium plating layer of the piston rod. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a hydraulic cylinder device for a hydraulic dam proposed in this invention.

[0018] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the protective structure proposed in this invention.

[0020] Figure 4 This is another schematic diagram of the protective structure proposed in this invention.

[0021] Figure 5 This is a cross-sectional schematic diagram of the protective structure proposed in this invention.

[0022] Figure 6 This is a schematic diagram of the sand-clearing component proposed in this invention.

[0023] Figure 7 This is a schematic diagram of the rinsing component proposed in this invention.

[0024] Figure 8 This is a schematic diagram of the sealing seat proposed in this invention.

[0025] In the diagram: 1. Cylinder body; 2. Piston rod; 3. Protective structure; 31. Connecting seat; 32. Sand cleaning component; 33. Flushing component; 34. Sealing seat; 35. Water baffle ring; 36. Sealing gasket; 321. Annular seat; 322. Scraper; 323. Baffle; 331. Housing; 332. Rotating seat; 333. Nozzle; 334. First spray hole; 335. Second spray hole; 341. Sealing ring; 342. Elastic ring; 343. First O-ring; 344. Second O-ring; 351. Drain hole. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] This embodiment discloses a hydraulic cylinder device for a hydraulic dam, such as... Figures 1-8As shown, the system includes a cylinder body 1, a piston rod 2, and a protective structure 3 for sealing and protecting the space between the cylinder body 1 and the piston rod 2. The cylinder body 1 also includes a guide sleeve for guiding the piston rod 2. The protective structure 3 is integrated and installed at the end of the cylinder body 1, and from the outside to the inside along the retraction direction of the piston rod 2, it includes a sand-cleaning component 32, a flushing component 33, a water-blocking ring 35, and a sealing seat 34. These four components are all fixedly installed in a ring-shaped connecting seat 31, which is fixedly connected to the cylinder body 1. The sand-cleaning component 32 and the flushing component 33 together constitute a two-stage cleaning system, and the sealing seat 34 constitutes the final sealing line.

[0028] The connecting seat 31 is a cylindrical structure with a flange at one end. It is fixedly connected to the end face of the cylinder body 1 by the flange and fastening bolts. The sand cleaning component 32 is fixedly installed at the outermost end of the inner cavity of the connecting seat 31, that is, the end closest to the external environment. The sand cleaning component 32 includes an annular scraper 322, which is fixedly installed in an annular seat 321. The annular seat 321 is fixedly connected to the connecting seat 31. A gap is left between the scraper 322 and the piston rod 2. The gap gradually changes from the outside to the inside along the axial direction.

[0029] Specifically, the inner wall of the scraper 322 is conical, with its inner diameter gradually increasing from the outside to the inside along the retraction direction of the piston rod 2. That is, the inner diameter is smallest at the outer end of the scraper 322 closest to the external environment, resulting in the smallest gap between it and the piston rod 2; conversely, the inner diameter is largest at the inner end of the scraper 322 closest to the flushing component, resulting in the largest gap between it and the piston rod 2. This conical structure ensures that as the piston rod 2 retracts, the gap between the piston rod 2 and the scraper 322 gradually increases along the retraction direction, which facilitates the scraping of mud and sand along the conical surface. To ensure smooth discharge and prevent stagnation, thus avoiding sediment from getting stuck between the scraper 322 and the piston rod 2 and causing scratches on the surface of the piston rod 2, the scraper 322 is equipped with an annular baffle 323 at its outer end, which is closer to the external environment. The baffle 323 extends radially toward the piston rod 2 and is used to prevent larger particles of sand or debris in the external water from directly impacting the root of the scraper 322, while also serving as a preliminary guide.

[0030] like Figure 7As shown, the flushing component 33 is fixedly installed in the middle of the inner cavity of the connecting seat 31, located inside the sand cleaning component 32, i.e., on the side close to the inside of the cylinder 1. The flushing component 33 includes an annular housing 331 and a rotating seat 332. The housing 331 is provided with a water inlet, which is connected to an external water pipe. The water pump supplies water to the inside of the housing 331 through the water pipe. The outer wall of the housing 331 is fixedly and sealed to the inner wall of the connecting seat 31. The inner wall of the housing 331 has an annular groove structure. The rotating seat 332 is circular, and its outer wall is embedded in the annular groove of the housing 331. It is sealed and rotated with the housing 331 through a sealing bearing or a sealing ring. The rotating seat 332 has an annular flow channel inside. This annular flow channel is connected to the water inlet channel on the side wall of the connecting seat 31 through the water inlet hole on the housing 331, so that the external high-pressure flushing water can enter the interior of the rotating seat 332.

[0031] Preferably, the inner wall of the rotating seat 332 is uniformly provided with a plurality of nozzles 333 along its axial direction, preferably 4 to 8, arranged in a ring array. Each nozzle 333 is provided with a first spray hole 334 and a second spray hole 335. The spray direction of the first spray hole 334 is perpendicular to the axis of the piston rod 2, that is, radially towards the outer surface of the piston rod 2, for vertical impact washing of the fine mud and sand remaining on the surface of the piston rod 2. The spray direction of the second spray hole 335 is towards the gap between the piston rod 2 and the scraper 322, and the spray direction of the second spray hole 335 is deviated from the axis of the piston rod 2 by a predetermined angle. The skewed design causes the high-pressure water to generate a tangential reaction force on the nozzle 333 when it is sprayed from the second nozzle 335, thereby driving the rotating seat 332 to rotate automatically within the housing 331. When the rotating seat 332 rotates, each nozzle 333 continuously changes its spray position along the circumference, achieving all-round washing of the surface of the piston rod 2 and the conical gap area of ​​the scraper 322. Furthermore, by spraying water into the gap between the piston rod 2 and the scraper 322 through the second nozzle 335, the high-pressure water flow, combined with the conical structure of the inner wall of the scraper 322, quickly flushes out the mud and sand in the gap, further preventing blockage between the scraper 322 and the piston rod 2.

[0032] Preferably, the water-blocking ring 35 is fixedly installed in the inner cavity of the connecting seat 31 between the flushing component 33 and the sealing seat 34. Its inner diameter is the same as that of the sealing seat 34 and smaller than the inner diameter of the rotating seat 332, i.e., the inner diameter of the flushing component 33. Multiple drainage holes 351 are evenly provided on the end face of the water-blocking ring 35 along the circumference. The water inlet of the drainage hole 351 is positioned with the end face of the water-blocking ring 35 facing the flushing component 33, and the water outlet is positioned on the circumference of the water-blocking ring 35. The size of the drainage hole 351 is larger than the gap between the scraper 322 and the piston rod 2 to prevent the drainage hole 351 from being blocked. When the flushing water and the flushed mud and sand mixture flow towards the water-blocking ring 35, most of the water flow is blocked by the inner ring surface of the water-blocking ring 35 and can only be discharged through the drainage holes 351 to the outside of the connecting seat 31. The corresponding position of the connecting seat 31 has a drainage channel. This structure effectively prevents a large amount of flushing water from flowing over the water-blocking ring 35 to the sealing seat 34 area.

[0033] like Figure 8 As shown, the sealing seat 34 is fixedly installed on the innermost side of the inner cavity of the connecting seat 31, that is, the end closest to the inside of the cylinder 1, for the final sealing between the cylinder 1 and the piston rod 2. The sealing seat 34 is annular, and its outer wall fits tightly with the inner wall of the connecting seat 31. The outer wall of the sealing seat 34 has an annular groove, and a second O-ring 344 is installed in the groove for radial static sealing between the outer wall of the sealing seat 34 and the inner wall of the cylinder 1. At the same time, a sealing gasket 36 is installed between the outer end face of the sealing seat 34 facing outward and the end face of the cylinder 1 or the stepped end face inside the connecting seat 31 for axial static sealing. Furthermore, a pair of lip-shaped sealing rings 341 are symmetrically installed on the inner wall of the sealing seat 34 along the axial direction.

[0034] Specifically, the lips of the two sealing rings 341 face opposite directions. The lip of the sealing ring 341 located on the outer side near the flushing component faces outward to prevent external mud, water, and flushing water from entering the cylinder body 1. The lip of the sealing ring 341 located on the inner side near the inside of the cylinder body 1 faces inward to prevent hydraulic oil inside the cylinder body 1 from leaking outward.

[0035] Specifically, each sealing ring 341 has an elastic ring 342 installed on its back. The elastic ring 342 is an O-ring spring or a metal sheet spring, which is used to provide a continuous radial compensation force to the lip of the sealing ring 341. Even if the sealing lip is slightly worn due to long-term reciprocating motion, the elastic ring 342 can still ensure that the sealing lip and the surface of the piston rod 2 remain in close contact.

[0036] The inner wall of the sealing seat 34 is also equipped with a first O-ring 343 between the two sealing rings 341. The first O-ring 343 serves as an intermediate auxiliary seal to form an additional barrier between the two sealing rings 341, further preventing external contaminants from seeping in or internal hydraulic oil from leaking out.

[0037] The working process of the device of the present invention is as follows: When the hydraulic dam needs to release water or lower the dam surface, the hydraulic cylinder drives the piston rod 2 to retract, that is, to move inward toward the cylinder body 1. First, the piston rod 2, which is covered with mud and sand, passes through the scraper 322. The conical inner wall of the scraper 322 performs preliminary mechanical scraping of large particles of mud and sand and attached substances on the surface of the piston rod 2. Subsequently, the piston rod 2 enters the flushing component 33 area. External high-pressure flushing water enters the annular flow channel of the rotating seat 332 through the water inlet channel of the connecting seat 31, and is then sprayed out by each nozzle 333. The first nozzle 334 impacts the surface of the piston rod 2 radially and vertically to remove residual fine mud and sand; the second nozzle 335 sprays obliquely to guide the water flow to the scraper 32. The gap area between piston rod 2 and piston rod 2 is flushed away to remove residual mud and sand accumulated there. At the same time, the deflected jet of the second nozzle 335 generates a reaction force, driving the rotating seat 332 to rotate automatically, so that the nozzle 333 continuously changes position in the circumferential direction to achieve 360° flushing. The mud and sand mixture water after flushing continues to flow inward and is blocked by the water baffle ring 35. Most of the mixed water is discharged to the outside through the drain hole 351 and the drain channel on the connecting seat 31. A small amount of residual water is effectively intercepted by the outward lip of the outer sealing ring 341. Finally, the clean piston rod 2 enters the cylinder 1 through the sealing seat 34. The whole process realizes a complete protective chain of "scraping-flushing-isolation-sealing".

[0038] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 this invention.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic cylinder device for a hydraulic dam, characterized in that, It includes a cylinder (1), a piston rod (2), and a protective structure (3) for sealing and protecting the cylinder (1) and the piston rod (2). The protective structure (3) includes: The sand-cleaning component (32) is used to clean the mud and sand on the surface of the piston rod (2) when it retracts; The flushing component (33) is used to flush the residual mud and sand on the surface of the piston rod (2) that was not cleaned by the sand-cleaning component (32) when the piston rod (2) retracts, and works in conjunction with the sand-cleaning component (32) to flush the surface of the piston rod.

2. The hydraulic cylinder device for a hydraulic dam according to claim 1, characterized in that, The sand-clearing component (32) includes an annular scraper (322), with a gap between the scraper (322) and the piston rod (2). The inner wall of the scraper (322) is conical and its inner wall diameter gradually increases along the retraction direction of the piston rod (2), so that when the piston rod (2) retracts, the gap between the piston rod and the scraper (322) gradually increases.

3. The hydraulic cylinder device for a hydraulic dam according to claim 2, characterized in that, The scraper (322) is provided with an annular seat (321) around its periphery, and a baffle (323) is provided at the end of the scraper (322).

4. The hydraulic cylinder device for a hydraulic dam according to claim 1, characterized in that, The flushing component (33) includes an annular housing (331) and a rotating seat (332) that is rotatably connected to the inner circumference of the housing (331). The interior of the rotating seat (332) is in communication with the interior of the housing (331), and a nozzle (333) is provided on the inner wall of the rotating seat (332) along its axial direction.

5. A hydraulic cylinder device for a hydraulic dam according to claim 4, characterized in that, The nozzle (333) is provided with a first nozzle (334) and a second nozzle (335). The first nozzle (334) sprays in a direction perpendicular to the axis of the piston rod (2), and the second nozzle (335) is directed toward the gap between the piston rod (2) and the scraper (322).

6. A hydraulic cylinder device for a hydraulic dam according to claim 5, characterized in that, The second nozzle (335) sprays water at an angle to the axis of the piston rod (2), so that when the nozzle (333) sprays water, it drives the rotating seat (332) to rotate automatically.

7. A hydraulic cylinder device for a hydraulic dam according to claim 1, characterized in that, The protective structure (3) also includes a sealing seat (34) and a connecting seat (31). The sealing seat (34) is used to seal between the cylinder (1) and the piston rod (2). The connecting seat (31) is used to fix the cylinder (1). The sand cleaning component (32), the flushing component (33), and the sealing seat (34) are all fixedly installed in the connecting seat (31) and arranged in sequence along the retraction direction of the piston rod (2).

8. A hydraulic cylinder device for a hydraulic dam according to claim 7, characterized in that, A water-blocking ring (35) is provided between the flushing component (33) and the sealing seat (34), and a drain hole (351) is provided on the water-blocking ring (35).

9. A hydraulic cylinder device for a hydraulic dam according to claim 7, characterized in that, A pair of lip-shaped sealing rings (341) are symmetrically installed on the inner wall of the sealing seat (34). The outer sealing ring (341) has its lip facing outward, and the inner sealing ring (341) has its lip facing inward. An elastic ring (342) is installed on the sealing ring (341). A first O-ring (343) is also installed on the inner wall of the sealing seat (34) between the two sealing rings (341).

10. A hydraulic cylinder device for a hydraulic dam according to claim 7, characterized in that, The outer wall of the sealing seat (34) is equipped with a second O-ring (344) for sealing between the outer wall of the sealing seat (34) and the inner wall of the cylinder (1), and a sealing gasket (36) is also installed on the outer wall of the sealing seat (34) for sealing between the outer wall of the sealing seat (34) and the end face of the cylinder (1).

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