Adjustable cylinder piston rod scraping device

Abstract

This invention provides an adjustable hydraulic cylinder piston rod scraping device, comprising a cylinder body, a piston, and a piston rod. The piston rod extends and retracts under the drive of the piston. A clamping flange and a scraping ring are provided at the cylinder port end of the cylinder body. The clamping flange abuts against the scraping ring, and the clamping force of the clamping flange along the piston rod's contraction direction is adjustable. When the clamping flange is adjusted to press along the piston rod's contraction direction, the scraping ring further adheres to the piston rod surface under the action of the clamping flange.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder technology, and more specifically, to an adjustable hydraulic cylinder piston rod scraping device. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device, has no transmission backlash, and provides smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. As a primary actuator in mechanical installations, the reliability and service life of a hydraulic cylinder depend critically on the quality of its sealing system. After the piston rod extends out of the cylinder, its surface inevitably comes into contact with external substances such as dust, dirt, and liquids. To prevent these deposits from being carried into the cylinder when the piston rod retracts, thus damaging the internal seals and affecting the cylinder's pressure-holding performance, a scraper ring or dustproof ring is typically installed at the cylinder inlet.

[0003] Existing scraper rings are all fixed. After a period of operation and wear, a gap often forms between the scraper ring and the piston rod, which cannot be adjusted. This causes the deposits on the piston rod surface to enter the oil cylinder through the gap, especially in harsh environments with a lot of dirt and impurities, such as underwater environments, which in turn has an adverse effect on the oil cylinder seal. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an adjustable hydraulic cylinder piston rod scraping device. By compressing the scraping ring with a clamping flange, the scraping ring is tightened, thereby improving the scraping effect and enhancing the sealing performance of the hydraulic cylinder.

[0005] The adjustable hydraulic cylinder piston rod scraping device provided by the present invention includes a cylinder body, a piston and a piston rod, wherein the piston rod performs telescopic movement under the drive of the piston;

[0006] The cylinder body is provided with a clamping flange and a scraper ring at the cylinder port end. The clamping flange abuts against the scraper ring, and the clamping force of the clamping flange along the piston rod contraction direction is adjustable.

[0007] Preferably, when the adjusting clamping flange is pressed along the piston rod contraction direction, the scraper ring is further pressed against the piston rod surface under the action of the clamping flange.

[0008] Preferably, the cylinder body further includes a cylinder port flange, and a first hollow cavity is provided between the cylinder port flange and the piston rod, with the scraper ring located within the first hollow cavity.

[0009] Preferably, the smudge-scraping ring includes a first smudge-scraping ring and a second smudge-scraping ring, and the first smudge-scraping ring and / or the second smudge-scraping ring are provided with an opening.

[0010] Preferably, the openings of the first and second cleaning rings are offset in the diametrical direction.

[0011] Preferably, the first scraping ring is provided with a second hollow cavity into which the second scraping ring can be slidably inserted, so as to realize the nesting cooperation between the first scraping ring and the second scraping ring.

[0012] Preferably, the scraper ring is a split design, and the cylinder port end of the cylinder body is also provided with a split scraper ring seat. The scraper ring scrapes dirt under the pressure of the clamping flange and the split scraper ring seat.

[0013] Preferably, a clamping gap is pre-set between the clamping flange and the cylinder flange or the split-type scraper seat.

[0014] Preferably, the scraping ring is further provided with a limiting scraping ring, which is a split design and made of a material with self-lubricating properties.

[0015] Preferably, the smudge-scraping ring is made of a ductile metal material.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The adjustable hydraulic cylinder piston rod scraping device provided by the present invention can adjust the assembly allowance of the scraping ring in the first hollow cavity by adjusting the clamping force of the clamping flange, thereby reducing the gap between the scraping ring and the piston rod, making the scraping ring and the piston rod surface fit more closely, and preventing the adhering substances on the piston rod surface from entering the hydraulic cylinder.

[0018] 2. The adjustable hydraulic cylinder piston rod scraping device provided by the present invention further reduces the gap between the scraping ring and the piston rod under the action of clamping force, which can improve the sealing performance of the hydraulic cylinder and ensure the long-term normal operation of the hydraulic cylinder even in complex underwater environments.

[0019] 3. The adjustable hydraulic cylinder piston rod scraping device provided by this invention has a limiting scraping ring made of a self-lubricating material on the scraping ring. This reduces the friction between the scraping ring and the piston rod and performs secondary scraping on the piston rod surface. When the scraping ring is pressed too tightly by the clamping flange, the limiting scraping ring can also support the scraping ring, preventing the piston rod's movement from being obstructed and the piston rod surface from being damaged.

[0020] 4. The adjustable hydraulic cylinder piston rod scraping device provided by the present invention has a split design for both the scraping ring and the limiting scraping ring, which can realize the quick replacement of the scraping ring and the limiting scraping ring without removing other structures such as the hydraulic cylinder lifting lug. Attached Figure Description

[0021] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a structural diagram of the adjustable hydraulic cylinder piston rod scraping device in Example 1;

[0023] Figure 2 This is an enlarged view of part A of the structural diagram of the adjustable hydraulic cylinder piston rod scraping device in Example 1;

[0024] Figure 3 This is a structural diagram of the first scraping ring of the adjustable hydraulic cylinder piston rod scraping device in Example 1;

[0025] Figure 4 This is a cross-sectional view along the GG direction of the first scraping ring of the adjustable hydraulic cylinder piston rod scraping device in Example 1.

[0026] Figure 5 This is a structural diagram of the second scraping ring of the adjustable hydraulic cylinder piston rod scraping device in Example 1;

[0027] Figure 6 This is a cross-sectional view of the second scraping ring JJ direction of the adjustable hydraulic cylinder piston rod scraping device in Example 1;

[0028] Figure 7 This is a structural diagram of the adjustable hydraulic cylinder piston rod scraping device in Example 2;

[0029] Figure 8 This is an enlarged view of part B of the structural diagram of the adjustable hydraulic cylinder piston rod scraping device in Example 2;

[0030] Figure 9 This is a structural diagram of the first scraping ring of the adjustable hydraulic cylinder piston rod scraping device in Example 2;

[0031] Figure 10 This is a cross-sectional view along the EE direction of the first scraping ring of the adjustable hydraulic cylinder piston rod scraping device in Example 2;

[0032] Figure 11 This is a structural diagram of the second scraping ring of the adjustable hydraulic cylinder piston rod scraping device in Example 2;

[0033] Figure 12 This is a cross-sectional view of the second scraping ring FF direction of the adjustable hydraulic cylinder piston rod scraping device in Example 2;

[0034] Figure 13 This is a structural diagram of the split-type scraping ring seat of the adjustable hydraulic cylinder piston rod scraping device in Example 2;

[0035] Figure 14 This is a side view of the split-type scraping ring seat of the adjustable hydraulic cylinder piston rod scraping device in Example 2;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-Cylinder block;

[0038] 2-Piston;

[0039] 3-Piston rod;

[0040] 4-Pressure flange;

[0041] 5-Cylinder flange;

[0042] 6- First scraping ring;

[0043] 7-Second scraping ring;

[0044] 8-Limiting scraper ring;

[0045] 9-Split type scraper seat. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0048] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, all directional indications (such as up, down, left, right, front, back, bottom, etc.) in this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indication will also change accordingly. Furthermore, descriptions involving "first," "second," etc., in this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0049] Example 1

[0050] This embodiment provides an adjustable hydraulic cylinder piston rod scraping device, including a cylinder body 1, a piston 2, and a piston rod 3. The piston rod 3 extends and retracts under the drive of the piston 2. A clamping flange 4 and a scraping ring are provided at the cylinder port end of the cylinder body 1. The clamping flange abuts against the scraping ring, and the clamping force of the clamping flange 4 along the retraction direction of the piston rod 3 is adjustable.

[0051] The adjustable hydraulic cylinder piston rod scraping device provided in this embodiment, when the adjusting clamping flange 4 is pressed along the contraction direction of the piston rod 3, the scraping ring further adheres to the surface of the piston rod 3 under the action of the clamping flange 4. To ensure that the movement of the piston rod 3 is not affected, an assembly allowance is often left when assembling the scraping ring. However, if the reserved assembly allowance is too large or as the scraping ring ages, the gap between the scraping ring and the piston rod 3 increases, which can cause the deposits on the piston rod to enter the hydraulic cylinder. By adjusting the clamping flange 4 to press the scraping ring, on the one hand, the gap between the scraping ring and the piston rod 3 can be further reduced, ensuring that the movement of the piston rod 3 is not restricted, while also improving the scraping effect and preventing finer particles from entering the hydraulic cylinder; on the other hand, when the scraping ring wears, the gap between the scraping ring and the piston rod 3 increases, and the scraping effect decreases. At this time, continuing to increase the clamping force can make the scraping ring and the surface of the piston rod 3 adhere further, extending the service life of the scraping ring while ensuring the scraping effect. When the adjusting clamping flange 4 is tightened, the clamping flange 4 is in contact with the outer surface of the scraper ring. Under the action of the clamping force, the scraper ring is tightened towards the surface of the piston rod 3.

[0052] Furthermore, the cylinder body 1 also includes a cylinder flange 5, and a first hollow cavity is provided between the cylinder flange 5 and the piston rod 3, with the sludge scraper ring located inside the first hollow cavity.

[0053] Furthermore, a clamping gap is pre-set between the clamping flange 4 and the cylinder flange 5, so that the clamping force provided by the clamping flange 4 has an adjustable range.

[0054] Furthermore, the cleaning ring includes a first cleaning ring 6 and a second cleaning ring 7. For example... Figures 1-6 As shown, this embodiment includes a pair of first scraping rings 6 and second scraping rings 7, both with openings to better achieve tight closure. The openings of the first scraping ring 6 and the second scraping ring 7 are offset in the diametrical direction to prevent scraping blind spots. The first scraping ring 6 has a second hollow cavity into which the second scraping ring 7 can slide. Under the action of clamping force, the surfaces of the first scraping ring 6 and the second scraping ring 7 abut against each other, achieving a nested fit between them. In other embodiments, two pairs of first scraping rings 6 and second scraping rings 7 can be provided to further improve the scraping effect. Furthermore, the scraping rings are made of a ductile metal material, such as copper.

[0055] Furthermore, the scraper ring is also equipped with a limiting scraper ring 8, which is made of a self-lubricating material, such as copper alloy or NGA material. The limiting scraper ring 8 can reduce the friction between the scraper ring and the piston rod 3, and perform secondary scraping on the surface of the piston rod 3. It can also prevent the scraper ring from sticking too tightly to the surface of the piston rod 3, which would affect the piston movement of the piston rod 3 and cause damage to the surface of the piston rod 3.

[0056] The adjustable hydraulic cylinder piston rod scraping device provided in this embodiment allows the piston rod 3 to extend and retract under the drive of the piston 2 during actual operation of the hydraulic cylinder, especially in water-filled environments. By adjusting the clamping flange 4 to press the piston rod 3 in the direction of retraction, the scraping ring further adheres to the surface of the piston rod 3 under the action of the clamping force. During the process of the piston rod 3 retracting back into the cylinder body 1, the adhering substances on the surface of the piston rod 3 can be scraped and cleaned by the clamped scraping ring. This can effectively prevent the adhering substances from entering the hydraulic cylinder along the retraction of the piston rod 3 and can also improve the sealing performance of the hydraulic cylinder.

[0057] This structural design allows for the following: First, by adjusting the clamping force of the clamping flange 4, the assembly allowance of the scraper ring within the first hollow cavity can be adjusted, reducing the gap between the scraper ring and the piston rod 3, allowing the scraper ring to fit more closely to the surface of the piston rod 3, preventing deposits from entering the cylinder. Second, under the clamping force, the gap between the scraper ring and the piston rod 3 is further reduced, improving the sealing performance of the cylinder and ensuring its long-term normal operation even in complex underwater environments. Third, the scraper ring is equipped with a limiting scraper ring 8 made of a self-lubricating material, which reduces the friction between the scraper ring and the piston rod 3 and performs secondary scraping on the surface of the piston rod 3. When the scraper ring is pressed too tightly by the clamping flange 4, the limiting scraper ring 8 can also provide support, preventing obstruction of the piston movement of the piston rod 3 and damage to the surface of the piston rod 3.

[0058] Example 2

[0059] like Figures 7-14 As shown, this embodiment provides an adjustable hydraulic cylinder piston rod scraping device, which is basically the same in structure as the adjustable hydraulic cylinder piston rod scraping device in Embodiment 1. The difference is that both the scraping ring and the limiting scraping ring 8 are designed as split rings. Additionally, a split scraping ring seat 9 is provided at the cylinder port end of the cylinder body. The scraping ring scrapes dirt under the pressure of the clamping flange and the split scraping ring seat 9. After removing the split scraping ring seat 9, the split scraping ring and the limiting scraping ring can be directly removed and replaced. In this embodiment, the split scraping ring seat can be split into two symmetrical half-rings. Each half-ring includes a head and a tail. The head of the half-ring has a positioning pin hole and a screw hole, and the tail of the half-ring has a groove corresponding to the screw hole. The two half-rings are connected end-to-end by screws to form the scraping ring seat. In other embodiments, the split scraping ring seat 9 can also be split into two ring-shaped structures unequally according to the need for disassembly. In existing technologies, replacing the scraper ring often requires removing structures such as cylinder lifting lugs that are mounted on the piston rod, which is time-consuming and labor-intensive. By designing the scraper ring and the limiting scraper ring 8 as a split type, the scraper ring and the limiting scraper ring 8 can be quickly replaced without removing other structures such as cylinder lifting lugs.

[0060] The specific embodiments of the present invention have been described above. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. An adjustable hydraulic cylinder piston rod scraping device, characterized in that, It includes a cylinder (1), a piston (2) and a piston rod (3), wherein the piston rod (3) performs telescopic movement under the drive of the piston (2); The cylinder body (1) is provided with a clamping flange (4) and a scraper ring at the cylinder port end. The clamping flange (4) abuts against the scraper ring. The clamping force of the clamping flange (4) along the contraction direction of the piston rod (3) is adjustable.

2. The adjustable hydraulic cylinder piston rod scraping device according to claim 1, characterized in that, When the adjusting clamping flange (4) is pressed along the contraction direction of the piston rod (3), the scraper ring is further pressed against the surface of the piston rod (3) under the action of the clamping flange (4).

3. The adjustable hydraulic cylinder piston rod scraping device according to claim 1, characterized in that, The cylinder body also includes a cylinder flange (5), and a first hollow cavity is provided between the cylinder flange (5) and the piston rod (3), and the sludge scraper is located in the first hollow cavity.

4. The adjustable hydraulic cylinder piston rod scraping device according to claim 1, characterized in that, The smudge-scraping ring includes a first smudge-scraping ring (6) and a second smudge-scraping ring (7), and the first smudge-scraping ring (6) and / or the second smudge-scraping ring (7) are provided with openings.

5. The adjustable hydraulic cylinder piston rod scraping device according to claim 4, characterized in that, The openings of the first scraping ring (6) and the second scraping ring (7) are offset in the diameter direction.

6. The adjustable hydraulic cylinder piston rod scraping device according to claim 4, characterized in that, The first scraper ring (6) is provided with a second hollow cavity into which the second scraper ring (7) can be slidably inserted, so as to realize the nesting cooperation between the first scraper ring (6) and the second scraper ring (7).

7. The adjustable hydraulic cylinder piston rod scraping device according to claim 1, characterized in that, The scraper ring is a split design, and the cylinder port end of the cylinder body (1) is also provided with a split scraper ring seat (9). The scraper ring scrapes dirt under the pressure of the clamping flange and the split scraper ring seat (9).

8. The adjustable hydraulic cylinder piston rod scraping device according to claim 7, characterized in that, A clamping gap is pre-set between the clamping flange (4) and the cylinder flange (5) or the split-type scraper seat (9).

9. The adjustable hydraulic cylinder piston rod scraping device according to claim 1, characterized in that, The scraper ring is also provided with a limiting scraper ring (8), which is a split design and made of a material with self-lubricating properties.

10. The adjustable hydraulic cylinder piston rod scraping device according to claim 1, characterized in that, The smudge-scraping ring is made of a ductile metal material.

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