Hydraulic cylinder with anti-leakage effect

Abstract

The utility model relates to hydraulic cylinder technical field, specifically disclose a hydraulic cylinder with anti -leakage effect, including cylinder barrel, piston, piston rod and piston rod head, the outside of piston rod is provided with sealed anti -leakage mechanism, sealed anti -leakage mechanism includes the cylinder cover of being located cylinder barrel upside, the upper end of cylinder cover is provided with thread groove, the bottom end of thread groove inner wall is penetrated and is provided with through -hole, the inside of piston rod passes through through -hole, the inside screw thread groove is connected with the connecting ring, prevent the thread loosening through the spring drive limit rod inserts the limit hole of connecting ring, when needing to replace first sealing washer, just pull the connecting plate and make limit rod exit limit hole, can spin out connecting ring and replace first sealing washer, do not need to disassemble the connecting bolt of cylinder cover and cylinder barrel, do not need to draw out piston rod and piston, also do not need to handle hydraulic oil leakage, simple and convenient operation, greatly shorten the sealing washer replacement time -consuming.

Description

Technical Field

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

[0002] Hydraulic cylinders, as the core actuators in hydraulic transmission systems, primarily convert the pressure energy of hydraulic oil into mechanical energy to achieve linear reciprocating motion or oscillating motion at a certain angle. They are widely used in engineering machinery, machine tools, metallurgical machinery, mining machinery, shipbuilding equipment, and automated production lines. In practical applications, the working stability of the hydraulic cylinder directly determines the operating efficiency and reliability of the entire machine. Hydraulic cylinders need to operate under high pressure and high frequency reciprocating motion conditions for extended periods, and their sealing performance is crucial to ensuring trouble-free operation. If hydraulic oil leakage occurs, it will not only waste hydraulic oil and pollute the working environment, but also lead to a decrease in the output force of the hydraulic cylinder and a reduction in motion accuracy, and in severe cases, even cause equipment shutdown.

[0003] To solve the leakage problem of hydraulic cylinders, the existing technology generally adopts the method of setting a sealing ring at the mating part of the cylinder head and piston rod. The sealing ring fills the gap between the cylinder head and piston rod, preventing hydraulic oil from leaking out from the mating gap.

[0004] However, existing hydraulic cylinders typically use a multi-bolt connection structure for the cylinder head and cylinder barrel. The sealing ring between the cylinder head and piston rod is prone to wear, aging, or deformation under long-term high-pressure and high-frequency friction conditions. When the sealing ring fails and needs to be replaced, the operator must first remove all the fixing bolts between the cylinder head and cylinder barrel to separate the cylinder head and cylinder barrel. In some cases, it is also necessary to pull the piston rod and piston as a whole out of the cylinder barrel and then disassemble the connection structure between the piston rod and piston before the piston rod can be pulled out of the through hole in the cylinder head. During this process, oil inside the cylinder barrel will flow out, and the operation of receiving the oil must also be taken into account, making the replacement process cumbersome and time-consuming.

[0005] Therefore, a hydraulic cylinder with anti-leakage properties is needed to solve the above problems. Utility Model Content

[0006] This utility model proposes a hydraulic cylinder with anti-leakage effect. While ensuring the anti-leakage performance of the mating part between the cylinder head and the piston rod, it can easily replace the first sealing ring between the cylinder head and the piston rod without disassembling the connecting bolts between the cylinder head and the cylinder barrel, without pulling out the piston rod and piston, and without additional handling of hydraulic oil leakage. The operation is simple and convenient, and the time spent on replacing the sealing ring is greatly shortened.

[0007] This utility model is implemented as follows: a hydraulic cylinder with anti-leakage effect includes a cylinder barrel, a piston, a piston rod and a piston rod head, and a sealing anti-leakage mechanism is provided on the outer side of the piston rod;

[0008] The sealing and leak-proof mechanism includes a cylinder head located on the upper side of the cylinder barrel. The upper end of the cylinder head is provided with a threaded groove, and the bottom end of the inner wall of the threaded groove is provided with a through hole. The piston rod passes through the interior of the through hole. A connecting ring is threadedly connected inside the threaded groove. Two first sealing rings that abut against the outer wall of the piston rod are embedded in the inner wall of the connecting ring through two grooves. Two second sealing rings that abut against the bottom end of the inner wall of the threaded groove are embedded in the lower end of the connecting ring through two grooves.

[0009] Two anti-loosening mechanisms are provided between the cylinder head and the connecting ring. Each anti-loosening mechanism includes a cavity inside the cylinder head. A compression spring is fixedly connected to the inner wall of the cavity. A movable plate is fixedly connected to the other end of the compression spring. A through groove is opened through the top of the inner wall of the cavity. A connecting plate passing through the through groove is fixedly connected to the upper end of the movable plate. A limit hole is opened on the outer wall of the connecting ring. A limit rod inserted into the limit hole is fixedly connected to the outer wall of the connecting plate.

[0010] As a preferred embodiment of the hydraulic cylinder with anti-leakage effect according to this utility model, the upper end of the piston rod is provided with a threaded hole, and the threaded hole is internally threaded with a screw rod that is fixedly connected to the piston rod head.

[0011] As a preferred embodiment of the hydraulic cylinder with anti-leakage effect according to this utility model, a guide rod is fixedly connected inside the cavity, passing through the movable plate and slidably connected to the movable plate, and the guide rod passes through the inside of the compression spring.

[0012] As a preferred embodiment of the hydraulic cylinder with anti-leakage effect according to this utility model, the upper end of the cylinder barrel is provided with a sealing gasket that abuts against the lower end of the cylinder cover by being embedded in a groove.

[0013] As a preferred embodiment of the hydraulic cylinder with anti-leakage effect according to this utility model, the cylinder cover and the outer wall of the cylinder barrel are both fixedly connected with a fixing plate, and the two fixing plates are fixedly connected by multiple bolts.

[0014] As a preferred embodiment of the hydraulic cylinder with anti-leakage effect according to this utility model, the upper end of the connecting ring is fixedly connected to a hand dial located outside the piston rod.

[0015] As a preferred embodiment of the hydraulic cylinder with anti-leakage effect according to this utility model, a handle is fixedly connected to the outer wall of the connecting plate.

[0016] The beneficial effects of this utility model are:

[0017] The hydraulic cylinder uses a first sealing ring on the inner wall of the connecting ring to tightly abut against the outer wall of the piston rod, and a second sealing ring at the lower end of the connecting ring to abut against the inner wall of the threaded groove, together ensuring the leak-proof performance of the mating parts between the cylinder head and the piston rod. A spring pushes a limit rod into the limit hole of the connecting ring to prevent the threads from loosening. When the first sealing ring needs to be replaced, simply pull the connecting plate to disengage the limit rod from the limit hole, and the connecting ring can be unscrewed for replacement. This eliminates the need to disassemble the connecting bolts between the cylinder head and cylinder barrel, remove the piston rod and piston, or deal with hydraulic oil leaks, making the operation simple and convenient and significantly reducing the time required for sealing ring replacement. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a front sectional view of the hydraulic cylinder with anti-leakage effect according to the present invention.

[0020] Figure 2 This is a partial front sectional view of the present invention;

[0021] Figure 3 This is a structural diagram of the connecting ring of this utility model;

[0022] Figure 4 This is a structural diagram of the cylinder head of this utility model.

[0023] The markings in the diagram are: 1. Cylinder; 2. Piston; 3. Piston rod; 4. Cylinder head; 5. Through hole; 6. Threaded groove; 7. Connecting ring; 8. First sealing ring; 9. Second sealing ring; 10. Hand dial; 11. Cavity; 12. Compression spring; 13. Guide rod; 14. Through groove; 15. Moving plate; 16. Connecting plate; 17. Limiting rod; 18. Limiting hole; 19. Fixed plate; 20. Threaded hole; 21. Screw; 22. Piston rod head; 23. Sealing gasket. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0025] Please see Figure 1-4A hydraulic cylinder with anti-leakage effect includes a cylinder barrel 1, a piston 2, a piston rod 3 and a piston rod head 22, and a sealing anti-leakage mechanism is provided on the outer side of the piston rod 3.

[0026] The sealing and leak-proof mechanism includes a cylinder head 4 located on the upper side of the cylinder barrel 1. A threaded groove 6 is provided at the upper end of the cylinder head 4. A through hole 5 is provided at the bottom end of the inner wall of the threaded groove 6. The piston rod 3 passes through the interior of the through hole 5. A connecting ring 7 is threadedly connected inside the threaded groove 6. Two first sealing rings 8 are embedded in the inner wall of the connecting ring 7 through two grooves and abut against the outer wall of the piston rod 3. Two second sealing rings 9 are embedded in the lower end of the connecting ring 7 through two grooves and abut against the bottom end of the inner wall of the threaded groove 6.

[0027] Two anti-loosening mechanisms are provided between the cylinder head 4 and the connecting ring 7. The anti-loosening mechanism includes a cavity 11 inside the cylinder head 4. A compression spring 12 is fixedly connected to the inner wall of the cavity 11. A moving plate 15 is fixedly connected to the other end of the compression spring 12. A through groove 14 is opened through the top of the inner wall of the cavity 11. A connecting plate 16 passing through the through groove 14 is fixedly connected to the upper end of the moving plate 15. A limit hole 18 is opened on the outer wall of the connecting ring 7. A limit rod 17 inserted into the limit hole 18 is fixedly connected to the outer wall of the connecting plate 16.

[0028] In this embodiment: When the hydraulic cylinder is in normal use, the cylinder barrel 1 serves as the carrier for storing hydraulic oil and moving the piston 2. The two first sealing rings 8 embedded in the two grooves on the inner wall of the connecting ring 7 are in close contact with the outer wall of the piston rod 3, preventing hydraulic oil from leaking along the gap between the piston rod 3 and the through hole 5. The two second sealing rings 9 embedded in the two grooves at the lower end of the connecting ring 7 are in contact with the bottom end of the inner wall of the threaded groove 6, preventing hydraulic oil from leaking along the threaded gap between the connecting ring 7 and the threaded groove 6. Together, they ensure the anti-leakage performance of the mating part between the cylinder head 4 and the piston rod 3.

[0029] To prevent the connecting ring 7 from loosening during hydraulic cylinder operation, two anti-loosening mechanisms between the cylinder head 4 and the connecting ring 7 work simultaneously. Under the natural elastic force of the compression spring 12, the limiting rod 17 on the outer wall of the connecting plate 16 is stably inserted into the limiting hole 18 on the outer wall of the connecting ring 7. The engagement between the limiting rod 17 and the limiting hole 18 restricts the circumferential rotation of the connecting ring 7, thus achieving reliable anti-loosening.

[0030] When the first sealing ring 8 wears out and needs to be replaced due to long-term use, the operator pulls the connecting plate 16 away from the connecting ring 7, causing the moving plate 15 to slide. At this time, the moving plate 15 compresses the compression spring 12 until the limiting rod 17 is completely disengaged from the limiting hole 18, releasing the limiting of the connecting ring 7. Then, the connecting ring 7 is rotated to disengage from the inside of the threaded groove 6. The piston rod head 22 is then removed, and the connecting ring 7 is pulled directly upward from the outer wall of the piston rod 3. The failed first sealing ring 8 is then removed from the groove on the inner wall of the connecting ring 7 and replaced with a new one. After replacement, the connecting ring 7 is screwed back into the threaded groove 6 until the second sealing ring 9 is tightly abutted against the bottom of the inner wall of the threaded groove 6. At this time, the limiting rod 17 and the limiting hole 18 are aligned. The handle is released, the compression spring 12 recovers its elasticity, pushing the moving plate 15 and the connecting plate 16 to reset, and the limiting rod 17 is reinserted into the limiting hole 18 to complete the anti-loosening fixation.

[0031] In summary, while ensuring the leak-proof performance of the mating part between the cylinder head 4 and the piston rod 3, the first sealing ring 8 between the cylinder head 4 and the piston rod 3 can be easily replaced without removing the connecting bolts between the cylinder head 4 and the cylinder barrel 1, without pulling out the piston rod 3 and the piston 2, and without additional handling of hydraulic oil leakage. The operation is simple and convenient, and the time spent on replacing the sealing ring is greatly shortened.

[0032] As a technical optimization of this utility model, the upper end of the piston rod 3 is provided with a threaded hole 20, and the threaded hole 20 is internally threaded with a screw 21 that is fixedly connected to the piston rod head 22.

[0033] In this embodiment, screwing the screw 21 into or out of the threaded hole 20 allows for quick installation and removal of the piston rod head 22.

[0034] As a technical optimization of this utility model, a guide rod 13 is fixedly connected inside the cavity 11, passing through the movable plate 15 and slidably connected to the movable plate 15. The guide rod 13 passes through the inside of the compression spring 12.

[0035] In this embodiment: since the guide rod 13 passes through the moving plate 15 and is slidably connected to the moving plate 15, the movement of the moving plate 15 is stable and without deviation; and since the guide rod 13 passes through the inside of the compression spring 12, the inside of the compression spring 12 is prevented from twisting.

[0036] As a technical optimization of this utility model, the upper end of the cylinder barrel 1 is provided with a sealing gasket 23 that abuts against the lower end of the cylinder head 4 through a groove.

[0037] In this embodiment, the sealing gasket 23 is in close contact with the lower end of the cylinder head 4, thereby preventing hydraulic oil from leaking from the mating surface of the cylinder barrel 1 and the cylinder head 4.

[0038] As a technical optimization of this utility model, the outer walls of the cylinder head 4 and the cylinder barrel 1 are both fixedly connected with fixing discs 19, and the two fixing discs 19 are fixedly connected by multiple bolts.

[0039] In this embodiment, a rigid connection between the cylinder head 4 and the cylinder barrel 1 is achieved by setting two fixing discs 19 and multiple bolts.

[0040] As a technical optimization of this utility model, the upper end of the connecting ring 7 is fixedly connected to a hand dial 10 located outside the piston rod 3.

[0041] In this embodiment, the connecting ring 7 is easily rotated by providing a hand dial 10.

[0042] As a technical optimization of this utility model, a handle is fixedly connected to the outer wall of the connecting plate 16.

[0043] In this embodiment, a handle is provided to facilitate the movement of the connecting plate 16.

[0044] The working principle and usage process of this utility model are as follows: When the hydraulic cylinder is in normal use, the cylinder barrel 1 serves as the carrier for storing hydraulic oil and moving the piston 2. The cylinder head 4 and the cylinder barrel 1 are rigidly fixed by two fixing discs 19 and multiple bolts. The sealing gasket 23 at the upper end of the cylinder barrel 1 is in close contact with the lower end of the cylinder head 4, which can prevent hydraulic oil from leaking from the mating surface of the cylinder barrel 1 and the cylinder head 4. The two first sealing rings 8 embedded in the two grooves on the inner wall of the connecting ring 7 are in close contact with the outer wall of the piston rod 3, blocking the leakage of hydraulic oil along the gap between the piston rod 3 and the through hole 5. The two second sealing rings 9 embedded in the two grooves at the lower end of the connecting ring 7 are in close contact with the bottom end of the inner wall of the threaded groove 6, preventing the hydraulic oil from leaking along the threaded gap between the connecting ring 7 and the threaded groove 6. Together, they ensure the anti-leakage performance of the mating part of the cylinder head 4 and the piston rod 3.

[0045] To prevent the connecting ring 7 from loosening during hydraulic cylinder operation, two anti-loosening mechanisms between the cylinder head 4 and the connecting ring 7 work simultaneously. Under the natural elastic force of the compression spring 12, the limiting rod 17 on the outer wall of the connecting plate 16 is stably inserted into the limiting hole 18 on the outer wall of the connecting ring 7. The engagement between the limiting rod 17 and the limiting hole 18 restricts the circumferential rotation of the connecting ring 7, thus achieving reliable anti-loosening.

[0046] When the first sealing ring 8 wears out and needs to be replaced due to long-term use, the operator first holds the handle on the outer wall of the connecting plate 16 and pulls the connecting plate 16 away from the connecting ring 7, causing the moving plate 15 to slide. At this time, the moving plate 15 compresses the compression spring 12 until the limit rod 17 completely disengages from the limit hole 18, releasing the limit on the connecting ring 7; then the hand dial 10 is turned to drive the connecting ring 7 out of the inside of the threaded groove 6. Then rotate the piston rod head 22 to disengage the screw 21 from the inside of the threaded hole 20, and then pull the connecting ring 7 directly upward from the outer wall of the piston rod 3. Then remove the failed first sealing ring 8 from the groove on the inner wall of the connecting ring 7 and replace it with a new one. After the replacement is completed, rotate the hand dial 10 in the opposite direction to screw the connecting ring 7 back into the threaded groove 6 until the second sealing ring 9 is tightly abutted against the bottom of the inner wall of the threaded groove 6. At this time, the limiting rod 17 and the limiting hole 18 are aligned with each other. Release the handle, and the compression spring 12 restores its elasticity to push the moving plate 15 and the connecting plate 16 to reset. The limiting rod 17 is inserted into the limiting hole 18 again to complete the anti-loosening fixation.

[0047] In summary, while ensuring the leak-proof performance of the mating part between the cylinder head 4 and the piston rod 3, the first sealing ring 8 between the cylinder head 4 and the piston rod 3 can be easily replaced without removing the connecting bolts between the cylinder head 4 and the cylinder barrel 1, without pulling out the piston rod 3 and the piston 2, and without additional handling of hydraulic oil leakage. The operation is simple and convenient, and the time spent on replacing the sealing ring is greatly shortened.

[0048] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", 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 utility model 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 utility model.

[0049] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A hydraulic cylinder with anti-leakage effect, comprising a cylinder barrel (1), a piston (2), a piston rod (3), and a piston rod head (22), characterized in that: A sealing and leak-proof mechanism is provided on the outside of the piston rod (3); The sealing and leak-proof mechanism includes a cylinder cover (4) located on the upper side of the cylinder barrel (1). The upper end of the cylinder cover (4) is provided with a threaded groove (6). The bottom end of the inner wall of the threaded groove (6) is provided with a through hole (5). The piston rod (3) passes through the interior of the through hole (5). The threaded groove (6) is threaded with a connecting ring (7). The inner wall of the connecting ring (7) is provided with two first sealing rings (8) that abut against the outer wall of the piston rod (3) through two grooves. The lower end of the connecting ring (7) is provided with two second sealing rings (9) that abut against the bottom end of the inner wall of the threaded groove (6) through two grooves. Two anti-loosening mechanisms are provided between the cylinder head (4) and the connecting ring (7). The anti-loosening mechanism includes a cavity (11) inside the cylinder head (4). A compression spring (12) is fixedly connected to the inner wall of the cavity (11). A moving plate (15) is fixedly connected to the other end of the compression spring (12). A through groove (14) is opened through the top of the inner wall of the cavity (11). A connecting plate (16) passing through the through groove (14) is fixedly connected to the upper end of the moving plate (15). A limiting hole (18) is opened on the outer wall of the connecting ring (7). A limiting rod (17) inserted into the limiting hole (18) is fixedly connected to the outer wall of the connecting plate (16).

2. A hydraulic cylinder with anti-leakage effect according to claim 1, characterized in that: The upper end of the piston rod (3) is provided with a threaded hole (20), and the threaded hole (20) is internally threaded with a screw (21) that is fixedly connected to the piston rod head (22).

3. A hydraulic cylinder with anti-leakage effect according to claim 1, characterized in that: The cavity (11) is fixedly connected to a guide rod (13) that passes through the movable plate (15) and is slidably connected to the movable plate (15). The guide rod (13) passes through the inside of the compression spring (12).

4. A hydraulic cylinder with anti-leakage effect according to claim 1, characterized in that: The upper end of the cylinder (1) is fitted with a sealing gasket (23) that abuts against the lower end of the cylinder head (4) via a groove.

5. A hydraulic cylinder with anti-leakage effect according to claim 1, characterized in that: The cylinder head (4) and the outer wall of the cylinder barrel (1) are both fixedly connected to a fixing plate (19), and the two fixing plates (19) are fixedly connected by multiple bolts.

6. A hydraulic cylinder with anti-leakage effect according to claim 1, characterized in that: The upper end of the connecting ring (7) is fixedly connected to a hand dial (10) located outside the piston rod (3).

7. A hydraulic cylinder with anti-leakage effect according to claim 1, characterized in that: A handle is fixedly connected to the outer wall of the connecting plate (16).

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