Multi-stage hydraulic cylinder with leakage prevention function

Abstract

The utility model relates to hydraulic pressure oil cylinder technical field, concretely is a kind of multistage hydraulic pressure oil cylinder with anti-leakage function, including cylinder bottom, the top of cylinder bottom is equipped with outer cylinder barrel, the inside sliding of outer cylinder barrel is equipped with first telescopic cylinder, the inside sliding of first telescopic cylinder is equipped with second telescopic cylinder, the top of outer cylinder barrel is equipped with first sealing fixed plate, the top of first telescopic cylinder is equipped with second telescopic cylinder, and the inside of oil inlet pipe and cylinder bottom is connected.The utility model when replacing oil seal operation, only need to disassemble first sealing clamping plate and fourth sealing clamping plate, and first sealing clamping plate and fourth sealing clamping plate will slide along the installation direction of first support sliding rod, thereby the interval between first sealing clamping plate and fourth sealing clamping plate is enlarged, sufficient maintenance space is provided for maintenance personnel, meanwhile the loss of parts can also be avoided, and the speed of subsequent installation is accelerated, and maintenance efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically a multi-stage hydraulic cylinder with anti-leakage function. Background Technology

[0002] Multistage hydraulic cylinders, also known as telescopic hydraulic cylinders, are hydraulic actuators that achieve long strokes through multistage sleeve-shaped piston rods. They are widely used in engineering machinery, mining equipment, ships and other fields.

[0003] Currently, multi-stage hydraulic cylinders use oil seals at the joints of each telescopic rod to prevent hydraulic oil leakage. However, these oil seals deteriorate over time due to aging and deformation, requiring regular replacement. Replacing the oil seals in existing designs requires complete disassembly of all hydraulic cylinder components, followed by reassembly. This disassembly method presents two major problems in actual operation: first, hydraulic cylinders typically operate under heavy loads, and frequent disassembly accelerates component wear; second, parts are easily lost during disassembly, preventing subsequent reassembly and severely impacting maintenance efficiency and reliability.

[0004] Therefore, a multi-stage hydraulic cylinder with anti-leakage function is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-stage hydraulic cylinder with anti-leakage function to solve the problems mentioned in the background art. To achieve the above objective, this utility model provides the following technical solution: A multi-stage hydraulic cylinder with anti-leakage function includes a cylinder bottom, an outer cylinder barrel installed on the top of the cylinder bottom, a first telescopic cylinder slidably installed inside the outer cylinder barrel, a second telescopic cylinder slidably installed inside the first telescopic cylinder, a first sealing fixing plate installed on the top of the outer cylinder barrel, a second telescopic cylinder installed on the top of the first telescopic cylinder, an oil inlet pipe installed on one side of the cylinder bottom, an oil outlet pipe installed on one side of the outer cylinder barrel, the oil inlet pipe communicating with the interior of the cylinder bottom, and the oil outlet pipe communicating with the interiors of the first telescopic cylinder and the outer cylinder barrel respectively. A first sealing clamp and a fourth sealing clamp are symmetrically slidably installed on the top of the first sealing fixing plate, a second sealing fixing plate is sleeved on the outer side of the second telescopic cylinder, and a second sealing clamp and a third sealing clamp are symmetrically slidably installed on the top of the second sealing fixing plate. An oil seal limiting groove is respectively opened on one side of the first sealing clamp, the fourth sealing clamp, the second sealing clamp, and the third sealing clamp.

[0006] Preferably, a first support slide rod is fixed on each of the two sides of the top of the first sealing plate, and the two sides of the first sealing clamp and the fourth sealing clamp are slidably sleeved on the outside of the first support slide rod.

[0007] Preferably, a second support slide rod is fixed on each of the two sides of the top of the second sealing plate, and the two sides of the second sealing clamp and the third sealing clamp are slidably sleeved on the outside of the second support slide rod.

[0008] Preferably, a limiting groove is provided on one side of the third sealing plate and the fourth sealing plate, and an insert plate is welded to one side of the second sealing plate and the first sealing plate.

[0009] Preferably, the third and fourth sealing plates are respectively connected to a fixing screw on both sides by threaded engagement, and a positioning hole is provided on one side of the insert plate.

[0010] Preferably, the top of the outer cylinder and the first telescopic cylinder are respectively provided with a threaded groove, and the bottom of the first sealing fixing plate and the second sealing fixing plate are respectively welded with a threaded sleeve.

[0011] Preferably, the threaded sleeve and the threaded groove are connected by threaded engagement, and the interior of the threaded sleeve is through-hole.

[0012] Preferably, one end of the fixing screw extends into the interior of the third and fourth sealing plates, and the fixing screw is fitted with the positioning hole.

[0013] Compared with the prior art, this utility model provides a multi-stage hydraulic cylinder with anti-leakage function, which has the following beneficial effects:

[0014] When replacing the oil seal, simply disassemble the first and fourth sealing plates. The first and fourth sealing plates will slide along the installation direction of the first support slide rod, thereby increasing the distance between the first and fourth sealing plates. This provides ample space for maintenance personnel, prevents the loss of parts, speeds up subsequent installation, and improves maintenance efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0016] Figure 2 This is a schematic diagram of the installation structure of this utility model;

[0017] Figure 3 This is a cross-sectional structural diagram of a portion of the present utility model;

[0018] Figure 4 This utility model Figure 1 A magnified structural diagram of point A in the middle.

[0019] In the diagram: 1. Cylinder bottom; 2. Outer cylinder barrel; 3. First support slide rod; 4. First sealing fixing plate; 5. First telescopic cylinder; 6. First sealing clamp; 8. Second sealing clamp; 9. Second telescopic cylinder; 10. Third sealing clamp; 11. Second support slide rod; 12. Oil seal limiting groove; 13. Fourth sealing clamp; 14. Oil drain pipe; 15. Oil inlet pipe; 16. Second sealing fixing plate; 17. Threaded sleeve; 18. Threaded groove; 19. Fixing screw; 20. Insert plate; 21. Positioning hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1: An outer cylinder 2 is installed on the top of the cylinder bottom 1. A first telescopic cylinder 5 is slidably installed inside the outer cylinder 2. A second telescopic cylinder 9 is slidably installed inside the first telescopic cylinder 5. A first sealing and fixing plate 4 is installed on the top of the outer cylinder 2. A second telescopic cylinder 9 is installed on the top of the first telescopic cylinder 5. An oil inlet pipe 15 is installed on one side of the cylinder bottom 1. An oil outlet pipe 14 is installed on one side of the outer cylinder 2. The oil inlet pipe 15 is connected to the interior of the cylinder bottom 1. The oil outlet pipe 14 is connected to the interior of the first telescopic cylinder 5 and the outer cylinder 2 respectively. A first sealing clamp 6 and a fourth sealing clamp 13 are symmetrically slidably installed on the top of the first sealing and fixing plate 4. A second sealing and fixing plate 16 is sleeved on the outside of the second telescopic cylinder 9. A second sealing clamp 8 and a third sealing clamp 10 are symmetrically slidably installed on the top of the second sealing and fixing plate 16. An oil seal limiting groove 12 is opened on one side of the first sealing clamp 6, the fourth sealing clamp 13, the second sealing clamp 8, and the third sealing clamp 10 respectively.

[0022] The threaded sleeve 17 and the threaded groove 18 are connected by threaded engagement, and the interior of the threaded sleeve 17 is through-hole.

[0023] The top of the outer cylinder 2 and the first telescopic cylinder 5 are respectively provided with a threaded groove 18, and the bottom of the first sealing fixing plate 4 and the second sealing fixing plate 16 are respectively welded with a threaded sleeve 17.

[0024] A first support slide rod 3 is fixed on each of the two sides of the top of the first sealing plate 4, and the two sides of the first sealing clamp 6 and the fourth sealing clamp 13 are respectively slidably sleeved on the outside of the first support slide rod 3.

[0025] A second support slide rod 11 is fixed on each of the two sides of the top of the second sealing plate 16, and the two sides of the second sealing clamp 8 and the third sealing clamp 10 are respectively slidably sleeved on the outside of the second support slide rod 11.

[0026] Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in use, the first sealing fixing plate 4 is sleeved on the outside of the first telescopic cylinder 5. Then, by rotating the first sealing fixing plate 4, the threaded sleeve 17 installed at the bottom of the first sealing fixing plate 4 is rotated and installed into the threaded groove 18 opened at the top of the outer cylinder 2, thereby fixing the first sealing fixing plate 4 to the top of the outer cylinder 2. Then, the oil seal sealing ring is sleeved on the outside of the first telescopic cylinder 5, and the oil seal is slid downward along the installation direction of the first telescopic cylinder 5, so that it slides between the two first sealing clamps 6 and the fourth sealing clamp 13. Since the first sealing clamp 6 and the fourth sealing clamp 13 are respectively provided with oil seal limiting grooves 12 on one side, the first sealing clamp 6 and the fourth sealing clamp 13 are then controlled to slide relative to each other, so that the two insert plates 20 fixed on one side of the first sealing clamp 6 are inserted into the interior of the fourth sealing clamp 13. The oil seal is fixed inside the oil seal limiting groove 12 to ensure that the position of the oil seal does not change during the subsequent extension and retraction of the first telescopic cylinder 5, thus ensuring the sealing effect. When replacing the oil seal, it is only necessary to disassemble the first sealing clamp 6 and the fourth sealing clamp 13. The first sealing clamp 6 and the fourth sealing clamp 13 will slide along the installation direction of the first support slide rod 3, thereby increasing the distance between the first sealing clamp 6 and the fourth sealing clamp 13, providing sufficient maintenance space for maintenance personnel, avoiding the loss of parts, and speeding up the subsequent installation and improving maintenance efficiency. Then, the first sealing clamp 6 is fixed to the top of the first telescopic cylinder 5 in the same way, thereby sealing the connection between the second telescopic cylinder 9 and the first telescopic cylinder 5 to prevent leakage.

[0027] Example 2: A limiting groove is provided on one side of the third sealing plate 10 and the fourth sealing plate 13, and an insert plate 20 is welded to one side of the second sealing plate 8 and the first sealing plate 6. A fixing screw 19 is threadedly connected to both sides of the third sealing plate 10 and the fourth sealing plate 13, and a positioning hole 21 is provided on one side of the insert plate 20. One end of the fixing screw 19 extends into the interior of the third sealing plate 10 and the fourth sealing plate 13, and the fixing screw 19 is fitted with the positioning hole 21.

[0028] Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, when fixing the first sealing plate 6 and the fourth sealing plate 13, the two insert plates 20 fixed on one side of the first sealing plate 6 can be inserted into the interior of the fourth sealing plate 13. Then, by rotating the fixing screw 19, one end of the fixing screw 19 can be inserted into the positioning hole 21 to fix the first sealing plate 6 and the fourth sealing plate 13. Similarly, when connecting the second sealing plate 8 and the third sealing plate 10, the insert plate 20 installed on one side of the second sealing plate 8 can be inserted into the interior of the third sealing plate 10 to fix it. The hydraulic oil can enter and exit through the oil inlet pipe 15 installed on one side of the cylinder bottom 1 and the oil outlet pipe 14 installed on one side of the outer cylinder 2.

[0029] Working principle: In use, the first sealing fixing plate 4 is sleeved on the outside of the first telescopic cylinder 5. Then, by rotating the first sealing fixing plate 4, the threaded sleeve 17 installed at the bottom of the first sealing fixing plate 4 is rotated and installed into the threaded groove 18 opened at the top of the outer cylinder 2, thereby fixing the first sealing fixing plate 4 to the top of the outer cylinder 2. Then, the oil seal sealing ring is sleeved on the outside of the first telescopic cylinder 5, and the oil seal is slid downward along the installation direction of the first telescopic cylinder 5, so that it slides between the two first sealing clamps 6 and the fourth sealing clamp 13. Since the first sealing clamp 6 and the fourth sealing clamp 13 are respectively provided with oil seal limiting grooves 12 on one side, the first sealing clamp 6 and the fourth sealing clamp 13 are then controlled to slide relative to each other, so that the two insert plates 20 fixed on one side of the first sealing clamp 6 are inserted into the inner part of the fourth sealing clamp 13. The oil seal is fixed inside the oil seal limiting groove 12, ensuring that the position of the oil seal does not change during the subsequent extension and retraction of the first telescopic cylinder 5, thus guaranteeing the sealing effect. When replacing the oil seal, it is only necessary to disassemble the first sealing clamp 6 and the fourth sealing clamp 13. The first sealing clamp 6 and the fourth sealing clamp 13 will slide along the installation direction of the first support slide rod 3, thereby increasing the distance between the first sealing clamp 6 and the fourth sealing clamp 13, providing sufficient maintenance space for maintenance personnel, preventing the loss of parts, and speeding up the subsequent installation and improving maintenance efficiency. Then, the first sealing clamp 6 is fixed to the top of the first telescopic cylinder 5 in the same way, thereby sealing the connection between the second telescopic cylinder 9 and the first telescopic cylinder 5 to prevent leakage.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-stage hydraulic cylinder with anti-leakage function, comprising a cylinder bottom (1), characterized in that: An outer cylinder (2) is installed on the top of the cylinder bottom (1). A first telescopic cylinder (5) is slidably installed inside the outer cylinder (2). A second telescopic cylinder (9) is slidably installed inside the first telescopic cylinder (5). A first sealing plate (4) is installed on the top of the outer cylinder (2). A second telescopic cylinder (9) is installed on the top of the first telescopic cylinder (5). An oil inlet pipe (15) is installed on one side of the cylinder bottom (1). An oil outlet pipe (14) is installed on one side of the outer cylinder (2). The oil inlet pipe (15) is connected to the inside of the cylinder bottom (1). The oil outlet pipe (14) is respectively... The first sealing plate (4) is symmetrically and slidably mounted with a first sealing clamp (6) and a fourth sealing clamp (13) on the top of the first sealing plate (4). The second sealing plate (9) is sleeved on the outside of the second sealing plate (9). The second sealing clamp (8) and a third sealing clamp (10) are symmetrically and slidably mounted on the top of the second sealing plate (16). The first sealing clamp (6), the fourth sealing clamp (13), the second sealing clamp (8) and the third sealing clamp (10) are respectively provided with oil seal limiting grooves (12) on one side.

2. A multi-stage hydraulic cylinder with anti-leakage function according to claim 1, characterized in that: A first support slide rod (3) is fixed on each side of the top of the first sealing plate (4), and the sides of the first sealing clamp (6) and the fourth sealing clamp (13) are slidably sleeved on the outside of the first support slide rod (3).

3. A multi-stage hydraulic cylinder with anti-leakage function according to claim 1, characterized in that: A second support slide rod (11) is fixed on each side of the top of the second sealing plate (16), and the sides of the second sealing clamp (8) and the third sealing clamp (10) are slidably sleeved on the outside of the second support slide rod (11).

4. A multi-stage hydraulic cylinder with anti-leakage function according to claim 1, characterized in that: A limiting groove is provided on one side of the third sealing plate (10) and the fourth sealing plate (13), and an insert plate (20) is welded on one side of the second sealing plate (8) and the first sealing plate (6).

5. A multi-stage hydraulic cylinder with anti-leakage function according to claim 4, characterized in that: The third sealing plate (10) and the fourth sealing plate (13) are respectively connected to a fixing screw (19) by thread engagement on both sides, and a positioning hole (21) is provided on one side of the insert plate (20).

6. A multi-stage hydraulic cylinder with anti-leakage function according to claim 1, characterized in that: The top of the outer cylinder (2) and the first telescopic cylinder (5) are respectively provided with a threaded groove (18), and the bottom of the first sealing fixing plate (4) and the second sealing fixing plate (16) are respectively welded with a threaded sleeve (17).

7. A multi-stage hydraulic cylinder with anti-leakage function according to claim 6, characterized in that: The threaded sleeve (17) and the threaded groove (18) are connected by threaded engagement, and the interior of the threaded sleeve (17) is through-hole.

8. A multi-stage hydraulic cylinder with anti-leakage function according to claim 5, characterized in that: One end of the fixing screw (19) extends into the interior of the third sealing plate (10) and the fourth sealing plate (13), and the fixing screw (19) is fitted with the positioning hole (21).

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