Adjustable oil cylinder piston rod dirt scraping device

Abstract

The utility model provides an adjustable oil cylinder piston rod dirt scraping device which comprises a cylinder body, a piston and a piston rod, and the piston rod is driven by the piston to do telescopic motion. A pressing flange and a dirt scraping ring are arranged at the cylinder opening end of the cylinder body, the pressing flange abuts against the dirt scraping ring, and the pressing force of the pressing flange in the contraction direction of the piston rod is adjustable. When the pressing flange is adjusted to be pressed in the shrinkage direction of the piston rod, the dirt scraping ring is further attached to the surface of the piston rod under the action of the pressing flange.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to an adjustable oil cylinder piston rod scraping device. Background Art

[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. Using it to achieve reciprocating motion eliminates the need for a reduction gear, eliminates transmission backlash, and provides smooth motion. Therefore, it is widely used in the hydraulic systems of various machines. As the primary actuator of mechanical equipment, the reliability and service life of a hydraulic cylinder depend critically on the quality of its sealing system. After the cylinder's piston rod extends out of the cylinder, its surface inevitably comes into contact with external substances such as dust, dirt, and liquids. To prevent this from being carried into the cylinder when the piston rod is retracted, damaging the seals within the cylinder and affecting the cylinder's pressure-maintaining performance, structures such as scraper rings and dust rings are generally installed at the cylinder inlet.

[0003] Existing scraper rings are all fixed. After a period of operation and wear, a gap often occurs between the scraper ring and the piston rod, which cannot be adjusted. As a result, attachments on the surface of the piston rod 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. Utility Model Content

[0004] In view of the defects in the prior art, the purpose of the utility model is to provide an adjustable oil cylinder piston rod scraping device, which squeezes the scraping ring by tightening the flange and tightens the scraping ring, thereby improving the scraping effect and improving the sealing performance of the oil cylinder.

[0005] The adjustable oil cylinder piston rod scraping device provided by the utility model comprises a cylinder body, a piston and a piston rod, wherein the piston rod performs telescopic movement under the drive of the piston;

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

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

[0008] Preferably, the cylinder body further comprises a cylinder mouth flange, a first hollow cavity is provided between the cylinder mouth flange and the piston rod, and the scraper ring is located in the first hollow cavity.

[0009] Preferably, the scraping ring includes a first scraping ring and a second scraping ring, and the first scraping ring and / or the second scraping ring are provided with openings.

[0010] Preferably, the opening of the first scraping ring and the opening of the second scraping ring are staggered in the diameter 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 achieve nested cooperation between the first scraping ring and the second scraping ring.

[0012] Preferably, the scraper ring is of split design, and a split scraper ring seat is further provided at the cylinder mouth end of the cylinder body. 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 mouth flange or the split-type scraper ring seat.

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

[0015] Preferably, the scraper 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 oil cylinder piston rod scraper device provided by the utility model can adjust the clamping force of the clamping flange, thereby adjusting the assembly margin of the scraper ring in the first hollow cavity, reducing the gap between the scraper ring and the piston rod, making the scraper ring fit more closely to the surface of the piston rod, and preventing attachments on the surface of the piston rod from entering the oil cylinder;

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

[0019] 3. The adjustable oil cylinder piston rod scraper device provided by this utility model features a limited scraper ring made of a self-lubricating material on the scraper ring. This reduces friction between the scraper ring and the piston rod and provides a secondary scraper on the piston rod surface. If the scraper ring is pressed too tightly against the compression flange, the limited scraper ring also supports the scraper ring, preventing obstruction of the piston rod's motion and damage to the piston rod surface.

[0020] 4. The adjustable oil cylinder piston rod scraping device provided by the utility model has a scraping ring and a limiting scraping ring that are both split-type designs, which can realize the quick replacement of the scraping ring and the limiting scraping ring without removing other structures such as the oil cylinder lifting ears. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0025] Figure 4 A cross-sectional view of the first scraping ring of the adjustable oil cylinder piston rod scraping device in the embodiment 1 in the direction of GG;

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

[0027] Figure 6 A cross-sectional view of the second scraping ring of the adjustable oil cylinder piston rod scraping device in Example 1 taken along the JJ direction;

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

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

[0031] Figure 10 A cross-sectional view of the first scraping ring of the adjustable oil cylinder piston rod scraping device in embodiment 2 taken along the EE direction;

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

[0033] Figure 12 A cross-sectional view of the second scraping ring of the adjustable oil cylinder piston rod scraping device in embodiment 2 taken along the FF direction;

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

[0035] Figure 14 A side view of the split scraper ring seat of the adjustable oil cylinder piston rod scraper device in Example 2;

[0036] Description of reference numerals:

[0037] 1-cylinder body;

[0038] 2-piston;

[0039] 3-piston rod;

[0040] 4-Tighten the flange;

[0041] 5-cylinder port flange;

[0042] 6-First scraping circle;

[0043] 7-Second scraping circle;

[0044] 8-limiting scraper ring;

[0045] 9-Split type scraper ring seat. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

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

[0049] Example 1

[0050] This embodiment provides an adjustable oil cylinder piston rod scraping device, comprising a cylinder body 1, a piston 2, and a piston rod 3. The piston rod 3 is driven to extend and retract by the piston 2. A clamping flange 4 and a scraping ring are provided at the bore 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] In the adjustable oil cylinder piston rod scraper device provided in this embodiment, when the clamping flange 4 is adjusted to press in the direction of piston rod 3's contraction, the scraper ring, under the action of the clamping flange 4, further conforms to the surface of the piston rod 3. To ensure that the movement of the piston rod 3 is not affected, an assembly margin is often left when assembling the scraper ring. However, if the reserved assembly margin is too large or the scraper ring ages, the gap between the scraper ring and the piston rod 3 increases, allowing debris from the piston rod to enter the cylinder. By adjusting the clamping flange 4 to press against the scraper ring, the gap between the scraper ring and the piston rod 3 can be further reduced, ensuring unrestricted movement of the piston rod 3 while also improving the scraping effect and preventing smaller particles from entering the cylinder. Furthermore, when the scraper ring wears, the gap between the scraper ring and the piston rod 3 increases, reducing the scraping effect. Increasing the clamping force further allows the scraper ring to conform to the surface of the piston rod 3, extending the scraper ring's service life while maintaining the scraping effect. When the clamping flange 4 is adjusted to be compressed, the clamping flange 4 contacts the outer surface of the scraper ring. Under the action of the compression force, the scraper ring is tightened toward the surface of the piston rod 3 .

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

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

[0054] Furthermore, the dirt scraping ring includes a first dirt scraping ring 6 and a second dirt scraping ring 7. Figures 1 to 6 As shown, this embodiment includes a pair of first and second scraper rings 6 and 7, both of which are provided with openings to better achieve the tightening and closure of the scraper rings. The openings of the first and second scraper rings 6 and 7 are staggered in the diameter direction to prevent the formation of a scraping blind spot. The first scraper ring 6 is provided with a second hollow cavity into which the second scraper ring 7 can slide. Under the action of the compressive force, the surfaces of the first and second scraper rings 6 and 7 abut, achieving a nested fit between the first and second scraper rings 6 and 7. In other embodiments, two pairs of first and second scraper rings 6 and 7 can be provided to further enhance the scraping effect. Furthermore, the scraper rings are made of a ductile metal material, such as copper.

[0055] Furthermore, the scraper ring is provided with a limited scraper ring 8, which is made of a self-lubricating material such as copper alloy or NGA. This limited scraper ring 8 reduces friction between the scraper ring and the piston rod 3, provides a secondary scraping effect on the surface of the piston rod 3, and prevents the scraper ring from fitting too tightly against the surface of the piston rod 3, thereby affecting piston motion and causing damage to the surface of the piston rod 3.

[0056] The adjustable oil cylinder piston rod scraping device provided in this embodiment has the following characteristics: during the actual operation of the oil cylinder, especially in a wading environment, the piston rod 3 is driven by the piston 2 to perform telescopic movement, and the piston rod 3 is pressed in the contraction direction by adjusting the clamping flange 4. Under the action of the clamping force, the scraping ring further fits to the surface of the piston rod 3. During the process of the piston rod 3 retracting back into the cylinder body 1, the attachments on the surface of the piston rod 3 can be scraped and cleaned by the scraping ring after being compressed, which can effectively prevent the attachments from entering the oil cylinder along with the contraction of the piston rod 3 and improve the sealing performance of the oil cylinder.

[0057] This structural design has the following advantages: First, by adjusting the clamping force of the clamping flange 4, the assembly margin of the scraper ring in the first hollow cavity can be adjusted, thereby reducing the gap between the scraper ring and the piston rod 3, making the scraper ring fit more closely to the surface of the piston rod 3 and preventing debris on the surface of the piston rod 3 from entering the cylinder; Second, under the action of the clamping force, the gap between the scraper ring and the piston rod 3 is further reduced, which can improve the sealing performance of the cylinder and ensure the long-term normal operation of the cylinder even in complex underwater environments; Third, the scraper ring is provided with a limit scraper ring 8 made of a self-lubricating material to reduce the friction between the scraper ring and the piston rod 3 and perform a secondary scraping of the surface of the piston rod 3. When the scraper ring is pressed too tightly by the clamping flange 4, the limit scraper ring 8 can also provide support for the scraper ring, preventing the piston movement of the piston rod 3 from being obstructed and the surface of the piston rod 3 from being damaged.

[0058] Example 2

[0059] like Figures 7 to 14 As shown, this embodiment provides an adjustable oil cylinder piston rod scraper device. Its structure is basically the same as the adjustable oil cylinder piston rod scraper device in Example 1, with the following differences: the scraper ring and the limiting scraper ring 8 are both split designs. At the same time, a split scraper ring seat 9 is also provided at the cylinder end of the cylinder body. The scraper ring scrapes dirt under the pressure of the clamping flange and the split scraper ring seat 9. After removing the split scraper ring seat 9, the split scraper ring and the limiting scraper ring can be directly removed and replaced. In this embodiment, the split scraper ring seat can be split into two symmetrical half rings, each of which includes a head and a tail. The head of the half ring is provided with a positioning pin hole and a screw hole, and the tail of the half ring is provided with a notch corresponding to the screw hole. The two half rings are connected end to end by screws to form the scraper ring seat. In other embodiments, the split scraper ring seat 9 can also be split into two ring structures of unequal proportions according to disassembly needs. In the prior art, when replacing a scraper ring, it is often necessary to remove the structures attached to the piston rod, such as the cylinder lugs, one by one, 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 the cylinder lugs.

[0060] The above describes the specific embodiments of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the scope of the technical concept of this utility model.

Claims

1. An adjustable oil cylinder piston rod scraping device, characterized in that: It comprises a cylinder body (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 mouth end of the cylinder body (1) is provided with a clamping flange (4) and a scraping ring. The clamping flange (4) abuts against the scraping ring. The clamping force of the clamping flange (4) along the contraction direction of the piston rod (3) is adjustable.

2. The adjustable oil cylinder piston rod scraping device according to claim 1, characterized in that: When the clamping flange (4) is adjusted to be compressed along the contraction direction of the piston rod (3), the scraping ring is further fitted to the surface of the piston rod (3) under the action of the clamping flange (4).

3. The adjustable oil cylinder piston rod scraping device according to claim 1, characterized in that: The cylinder body further comprises a cylinder mouth flange (5), a first hollow cavity is provided between the cylinder mouth flange (5) and the piston rod (3), and the scraper ring is located in the first hollow cavity.

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

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

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

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

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

9. The adjustable oil cylinder piston rod scraping device according to claim 1, characterized in that: A limited scraping ring (8) is also provided on the scraping ring. The limited scraping ring (8) is of split design and is made of a material with self-lubricating properties.

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

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