Hydraulic oil cylinder with leak-proof function

Abstract

The hydraulic oil cylinder with the anti-leakage function comprises a cylinder body, a piston rod, a piston and two sets of rubber rings, the two sets of rubber rings are arranged at the two axial ends of the piston respectively, annular grooves coaxial with the rubber rings are formed in the end faces of the sides, away from the piston, of the rubber rings, and arc-shaped hoops in a major arc shape are embedded in the annular grooves; the arc-shaped hoop is made of shape memory alloy, and the inner diameter of the arc-shaped hoop which is heated to restore the original shape is larger than the inner diameter of the annular groove. The arc-shaped hoop made of the shape memory alloy is arranged on the rubber ring, when the temperature in the cylinder body rises, the arc-shaped hoop is heated to recover the original shape and push the rubber ring to expand outwards, so that the outer arc side of the rubber ring abuts against the inner wall of the cylinder body more tightly, and therefore the sealing effect of the rubber ring can be effectively guaranteed; therefore, the leakage risk of the hydraulic oil cylinder during high-load work is reduced, and accurate operation control of the hydraulic oil cylinder is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic cylinders, and in particular to a hydraulic cylinder with an anti-leakage function. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines. The hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. During the frequent and rapid opening and closing of the piston rod, the continuous friction on the inner wall of the cylinder barrel causes the gap between the piston rod and the inside of the cylinder barrel to increase, and finally oil leakage occurs, resulting in reduced work efficiency of the hydraulic cylinder, or even failure to work.

[0003] In the related art, a Chinese patent with publication number CN219220900U proposes a leak-proof hydraulic cylinder, including a cylinder and a leak-proof component located in the inner cavity of the cylinder, the cylinder including a cylinder body and a cylinder head fixedly connected to a port, and the inner cavity of the cylinder head is slidably sleeved with a piston rod, one end of the piston rod is provided with a piston, and the leak-proof component includes a rubber ring fixedly connected to both ends of the piston, and the surface of the rubber ring fits the inner wall of the cylinder body, an inclined groove is provided at the bottom of the rubber ring, the inner wall of the rubber ring is bent from the inside to the outside to form an arc surface, and the upper wall of the inner cavity of the rubber ring is symmetrically provided with a tensioning component. The utility model can solve the problem that when the outer surface of the piston is not completely concentric with the inner surface of the cylinder barrel, the sealing ring produces uneven wear, which will cause uneven sealing rings, and gaps will appear between the inner wall of the cylinder body, resulting in oil leakage, thereby causing the cylinder to malfunction.

[0004] The above-mentioned related technologies have the following defects: when the piston rod reciprocates rapidly in the cylinder body, it will not only cause wear of the rubber ring, but also generate a lot of heat, which will accelerate the aging of the rubber ring, causing the elastic performance of the rubber ring to weaken or even become disabled, making it difficult to achieve a good sealing effect on the piston, which will cause the hydraulic cylinder to easily leak under high-load operation, affecting the precise operation control of the hydraulic cylinder. Utility Model Content

[0005] In order to improve the problem that the heat generated by the frequent reciprocating motion of the piston will accelerate the aging of the rubber ring and affect its sealing performance, the present application provides a hydraulic cylinder with an anti-leakage function.

[0006] The present application provides a hydraulic cylinder with anti-leakage function adopts the following technical solution:

[0007] A hydraulic oil cylinder with anti-leakage function comprises a cylinder body, a piston rod, a piston and a rubber ring, wherein the rubber ring is provided in two groups and arranged at the axial ends of the piston, an annular groove coaxial with the piston is provided on the end surface of the rubber ring on the side away from the piston, an arc-shaped arc hoop is embedded in the annular groove, the arc hoop is made of a shape memory alloy, and the inner diameter of the arc hoop when it is heated to restore its original shape is larger than the inner diameter of the annular groove.

[0008] Furthermore, the annular groove and the arc-shaped hoop on the same rubber ring are correspondingly provided with a plurality of groups having different inner diameters, and the notches between two adjacent arc-shaped hoop are arranged opposite to each other with respect to the axis of the piston rod.

[0009] Furthermore, a baffle is integrally formed at the opening of the annular groove on the side of the rubber ring facing away from the piston, the baffle is fixed to the outer arc side groove wall of the annular groove, and the gap between the baffle and the inner arc side groove wall of the annular groove is smaller than the thickness of the arc hoop wall.

[0010] Furthermore, the piston rod is also provided with scraper rings located at both axial ends of the piston, the rubber ring is located between the piston and the scraper rings, and the scraper rings are made of polymer plastic.

[0011] Furthermore, the scraper ring is slidably sleeved on the piston rod, a limiting block is fixedly connected to the piston rod, and a gap between the limiting block and the rubber ring is greater than twice the thickness of the scraper ring.

[0012] Furthermore, an elastic member is provided between the scraper ring and the rubber ring.

[0013] Furthermore, flanges are coaxially fixedly connected to both end surfaces of the piston, and the rubber ring is wrapped around the flanges and pressed tightly against the end surfaces of the piston.

[0014] In summary, the beneficial technical effects of this application are:

[0015] When the hydraulic cylinder is working at high load, the piston rod drives the piston to frequently reciprocate in the cylinder body. A large amount of heat will be generated when the piston and the rubber ring rub against the inner wall of the cylinder body. The temperature of the arc hoop in the ring groove of the rubber ring also rises with the increase of the ambient temperature in the cylinder body. When the austenite phase deformation temperature of the arc hoop is reached, the arc hoop returns to its original shape and pushes the rubber ring to expand outward, so that the outer arc side of the rubber ring is more tightly against the inner wall of the cylinder body, thereby effectively ensuring the sealing effect of the rubber ring, thereby reducing the risk of leakage when the hydraulic cylinder is working at high load and ensuring the precise operation control of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional view of the overall structure of an embodiment of the present application;

[0017] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A.

[0018] Explanation of the reference numerals: 1. cylinder body; 2. piston rod; 21. limit block; 22. elastic member; 3. piston; 31. flange; 4. rubber ring; 41. ring groove; 42. baffle; 5. arc hoop; 51. notch; 6. scraper ring. DETAILED DESCRIPTION

[0019] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0020] The embodiment of the present application discloses a hydraulic cylinder with anti-leakage function. Figure 1 and Figure 2 A hydraulic cylinder with anti-leakage function includes a cylinder body 1, a piston rod 2, a piston 3 and a rubber ring 4. The rubber ring 4 is provided in two groups and is arranged at both axial ends of the piston 3. Specifically, flanges 31 are coaxially fixed to both end surfaces of the piston 3. The outer diameter of the flange 31 is smaller than the outer diameter of the piston 3. The rubber ring 4 is sleeved and wrapped on the flange 31 and pressed tightly against the end surface of the piston 3.

[0021] A coaxial annular groove 41 is provided on the end surface of the rubber ring 4 on the side away from the piston 3. The annular groove 41 is arranged at a position close to the outer arc side of the rubber ring 4. An arc-shaped arc hoop 5 is embedded in the annular groove 41, or the arc hoop 5 is a ring with a notch. The arc hoop 5 is made of a shape memory alloy, and the inner diameter of the arc hoop 5 that recovers its original shape when heated is larger than the inner diameter of the annular groove 41; the specific arrangement is that the arc hoop 5 is in an arc shape in the austenite phase, and in the martensite phase at room temperature, it can be bent arbitrarily and embedded in the small-diameter annular groove 41.

[0022] After such arrangement, when the hydraulic cylinder of the present application is working normally, the piston 3 and the rod 2 drive the piston 3 to reciprocate in the cylinder body 1 at a low frequency, and the heat generated in the cylinder body 1 is small. At this time, the rubber ring 4 has a good sealing effect; once the hydraulic cylinder is working at a high load, the piston 3 and the rod 2 drive the piston 3 to reciprocate frequently in the cylinder body 1, and a large amount of heat will be generated when the piston 3 and the rubber ring 4 rub against the inner wall of the cylinder body 1. When the hydraulic oil in the cylinder body 1 cannot dissipate the excessive heat, the temperature in the cylinder body 1 will rise, which will affect the sealing performance of the rubber ring 4 after a long time. At this time, the temperature of the arc hoop 5 located in the annular groove 41 of the rubber ring 4 also rises with the increase of the ambient temperature in the cylinder body 1, until the austenite phase deformation temperature of the arc hoop 5 is reached, the arc hoop 5 restores its original shape, and pushes the rubber ring 4 to expand outward, so that the outer arc side of the rubber ring 4 is more tightly against the inner wall of the cylinder body 1, thereby effectively ensuring the sealing effect of the rubber ring 4, thereby reducing the leakage risk of the hydraulic cylinder when working at high load, and ensuring the precise operation control of the hydraulic cylinder.

[0023] In order to make the rubber ring 4 expand outward more evenly under the action of the arc hoop 5, so as to reduce the probability of eccentric wear of the rubber ring 4, refer to Figure 1 and Figure 2 , the annular groove 41 and the arc-shaped hoop 5 on the same rubber ring 4 are correspondingly provided with multiple groups with different inner diameters, and the notch portions 51 between two adjacent arc-shaped hoop 5 are arranged opposite to each other with the axis of the piston 3 rod 2. Specifically, the arc-shaped hoop 5 is arranged in an even number of groups and the notches of two arc-shaped hoop 5 are arranged opposite to each other. In this embodiment, two groups of arc-shaped hoop 5 are arranged. At the same time, a baffle 42 is integrally formed at the opening of the annular groove 41 on the side of the rubber ring 4 away from the piston 3. The baffle 42 is fixedly connected to the outer arc side groove wall of the annular groove 41, and the gap between the baffle 42 and the inner arc side groove wall of the annular groove 41 is smaller than the wall thickness of the arc-shaped hoop 5.

[0024] After such arrangement, when the arc hoop 5 is heated and restored to the initial arc shape, the supporting effect of the notch on the outward expansion of the rubber ring 4 is relatively weak. At this time, the other arc hoop 5 pushes the rubber ring 4 outward after being heated to form a certain support for the rubber ring 4 at this position, so that the rubber ring 4 can expand more evenly under the action of the arc hoop 5. In addition, the setting of the baffle can limit the arc hoop 5 in the annular groove 41 to prevent the arc hoop 5 from popping out of the annular groove 41 after being heated and restored, thereby losing the supporting effect on the outward expansion of the rubber ring 4; at the same time, since the baffle 42 is integrally formed with the rubber ring 4, the baffle 42 also has a certain elasticity, and the arc hoop 5 can be bent arbitrarily at room temperature, so even if the gap between the baffle 42 and the inner arc side groove wall of the annular groove 41 is smaller than the wall thickness of the arc hoop 5, the arc hoop 5 can be installed in the annular groove 41.

[0025] On the other hand, considering that the rubber ring 4 and the piston 3 produce a certain amount of residue after being worn on the inner wall of the cylinder body 1, it may have a certain impact on the sealing performance of the rubber ring 4. Figure 1 and Figure 2 A scraper ring 6 is also installed on the piston 3 rod 2 at both axial ends of the piston 3. The scraper ring 6 is slidably adapted to the inner wall of the cylinder body 1. The rubber ring 4 is located between the piston 3 and the scraper ring 6. The scraper ring 6 is made of polymer plastic, specifically polytetrafluoroethylene with high lubricity and high weather resistance.

[0026] In this way, when the piston 3 follows the piston 3 rod 2 to make reciprocating motion in the cylinder body 1, the scraper ring 6 also follows the piston 3 rod 2 to scrape and clean the inner wall of the cylinder body 1, which can improve the cleanliness of the inner wall of the cylinder body 1 and reduce the secondary wear of the rubber ring 4.

[0027] More specifically, see Figure 1 The scraper ring 6 is slidably mounted on the piston 3 rod 2, and a limit block 21 is fixed on the piston 3 rod 2. The gap between the limit block 21 and the rubber ring 4 is greater than twice the thickness of the scraper ring 6. An elastic member 22 is arranged between the scraper ring 6 and the rubber ring 4. The elastic member 22 is set as a spring mounted on the piston 3 rod 2.

[0028] After such arrangement, when the piston 3 rod 2 drives the piston 3 to move, the scraper ring 6 moves toward the direction close to the piston 3 under the action of the resistance of the hydraulic oil in the cylinder body 1, the elastic member 22 is compressed and deformed, and the scraper ring 6 scrapes and cleans the inner wall of the cylinder body 1; when the piston 3 rod 2 moves to the set position or the moving speed is reduced, the deformation force of the elastic member 22 is sufficient to overcome the resistance of the hydraulic oil in the cylinder body 1. At this time, the scraper ring 6 moves in the direction away from the piston 3 under the action of the elastic member 22 to push away the residue scraped off the inner wall of the cylinder body 1 by the scraper ring 6, which can reduce the occurrence of the phenomenon that the residue adheres to the scraper ring 6 for a long time and affects the scraping efficiency of the scraper ring 6 to a certain extent.

[0029] The implementation principle of a hydraulic cylinder with anti-leakage function in the embodiment of the present application is:

[0030] When the hydraulic cylinder is working at high load, the piston 3 and the rod 2 drive the piston 3 to frequently reciprocate in the cylinder body 1. A large amount of heat will be generated when the piston 3 and the rubber ring 4 rub against the inner wall of the cylinder body 1. The temperature of the arc hoop 5 in the annular groove 41 of the rubber ring 4 also rises with the increase of the ambient temperature in the cylinder body 1. When the austenite phase deformation temperature of the arc hoop 5 is reached, the arc hoop 5 restores its original shape and pushes the rubber ring 4 to expand outward, so that the outer arc side of the rubber ring 4 is more tightly against the inner wall of the cylinder body 1, thereby effectively ensuring the sealing effect of the rubber ring 4, thereby reducing the risk of leakage when the hydraulic cylinder is working at high load, and ensuring the precise operation control of the hydraulic cylinder.

[0031] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydraulic cylinder with anti-leakage function, comprising a cylinder body (1), a piston (3), a rod (2), a piston (3) and a rubber ring (4), characterized in that: The rubber ring (4) is provided in two groups and is arranged at the axial ends of the piston (3). An annular groove (41) coaxial with the piston (3) is provided on the end surface of the rubber ring (4) on the side away from the piston (3). An arc-shaped hoop (5) in the shape of an arc is embedded in the annular groove (41). The arc-shaped hoop (5) is made of a shape memory alloy. The inner diameter of the arc-shaped hoop (5) when it is restored to its original shape after being heated is larger than the inner diameter of the annular groove (41).

2. The hydraulic cylinder with anti-leakage function according to claim 1, characterized in that: The annular groove (41) and the arc-shaped hoop (5) on the same rubber ring (4) are provided in a plurality of groups with different inner diameters, and the notch portions (51) between two adjacent arc-shaped hoop (5) are arranged opposite to each other with respect to the axis of the piston (3) rod (2).

3. The hydraulic cylinder with anti-leakage function according to claim 1, characterized in that: A baffle (42) is integrally formed at the opening of the annular groove (41) on the side of the rubber ring (4) facing away from the piston (3); the baffle (42) is fixedly connected to the outer arc side groove wall of the annular groove (41); and a gap between the baffle (42) and the inner arc side groove wall of the annular groove (41) is smaller than the wall thickness of the arc-shaped hoop (5).

4. A hydraulic cylinder with anti-leakage function according to any one of claims 1 to 3, characterized in that: The piston (3) rod (2) is also provided with scraper rings (6) located at both axial ends of the piston (3); the rubber ring (4) is located between the piston (3) and the scraper ring (6); and the scraper ring (6) is made of polymer plastic.

5. The hydraulic cylinder with anti-leakage function according to claim 4, characterized in that: The scraper ring (6) is slidably sleeved on the piston (3) rod (2), a limit block (21) is fixedly connected to the piston (3) rod (2), and a gap between the limit block (21) and the rubber ring (4) is greater than twice the thickness of the scraper ring (6).

6. The hydraulic cylinder with anti-leakage function according to claim 5, characterized in that: An elastic member (22) is provided between the scraper ring (6) and the rubber ring (4).

7. The hydraulic cylinder with anti-leakage function according to claim 1, characterized in that: Both end surfaces of the piston (3) are coaxially fixedly connected with flanges (31), and the rubber ring (4) is sleeved and wrapped around the flanges (31) and tightly pressed against the end surfaces of the piston (3).

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