Multi-stage hydraulic oil cylinder with stepped progressive sealing structure

Abstract

The multi-stage hydraulic oil cylinder with the step type progressive sealing structure comprises a hydraulic barrel, installation lugs are fixedly installed on the outer surface of the hydraulic barrel, a first shaft body is installed in the hydraulic barrel in a sliding mode, and thread mechanisms are arranged on the outer surface of the first shaft body and the outer surface of a second shaft body respectively. And the first shaft body and the second shaft body can be conveniently sealed through the thread mechanism and can be conveniently replaced. According to the multi-stage hydraulic oil cylinder with the step type progressive sealing structure, after the multi-stage hydraulic oil cylinder is used for a long time, the third sealing ring is inevitably abraded to cause hydraulic oil leakage, at the moment, a screw cap can be rotated, and the screw cap is screwed off from the outer surfaces of the end cover and the first shaft body; the third sealing ring and the blind nut can be taken down from the first shaft body and the second shaft body, then the third sealing ring can be detached and replaced, and after the third sealing ring is abraded, the multi-stage hydraulic oil cylinder does not need to be integrally detached, and maintenance can be conveniently conducted.

Description

TECHNICAL FIELD

[0001] The utility model relates to multistage hydraulic cylinder technical field, concretely is a multistage hydraulic cylinder with step type progressive sealing structure. BACKGROUND

[0002] Hydraulic cylinder is a kind of hydraulic execution element that liquid is compressed and converted into mechanical energy, is important part in hydraulic system, can do linear reciprocating motion or swing motion, hydraulic cylinder structure is simple, reliable, with hydraulic cylinder to do reciprocating motion, can dispense with speed reducer, and there is no transmission gap, it is very stable to move, therefore, it has been widely used in various mechanical hydraulic systems, wherein multistage hydraulic cylinder is the hydraulic cylinder with multiple working chambers, can provide larger stroke and thrust under smaller external size and space, but when multistage hydraulic cylinder leaks in the process of use, generally needs to be disassembled to replace the sealing ring inside, and it is inconvenient to overhaul and maintain. UTILITY MODEL CONTENTS

[0003] The utility model discloses a multistage hydraulic cylinder with step type progressive sealing structure to solve the problem of inconvenient replacement and maintenance of sealing ring in the background art.

[0004] To achieve the above object, the utility model provides the following technical scheme: a multistage hydraulic cylinder with step type progressive sealing structure, including hydraulic barrel, the outer surface of hydraulic barrel is fixedly installed with mounting lug, and mounting lug is symmetrically arranged, the inside of first shaft body is slidably installed with second shaft body, and the outer surface of one end of hydraulic barrel is attached with end cover, and the outer surface of end cover is attached with the outer surface of hydraulic barrel, the outer surface of first shaft body and second shaft body is provided with threaded mechanism respectively, and the threaded mechanism is convenient for sealing between first shaft body and second shaft body and can be conveniently replaced.

[0005] Preferably, the threaded mechanism comprises: screw cap, the screw cap is respectively screwed on the outer surface of end cover and first shaft body, and the outer surface of first shaft body and second shaft body is not attached with screw cap, the outer surface of screw cap is uniformly provided with recess, and the inner surface of screw cap is clamped with third sealing ring, and the outer surface of third sealing ring is respectively attached with the outer surface of first shaft body and second shaft body.

[0006] The third sealing ring can be installed through the screw cover, the screw cover is screwed into the outer surface of the end cover and the first shaft body, the third sealing ring can be installed and matched with the outer surfaces of the first shaft body and the second shaft body, the third sealing ring can be installed and taken out layer by layer to seal the first shaft body and the second shaft body, and the screw cover can be taken out to replace the third sealing ring.

[0007] Preferably, the hydraulic barrel is provided with a fixing bolt penetrating the outer surface of the end cover, the outer surface of the fixing bolt is matched with the outer surfaces of the hydraulic barrel and the end cover, one end of the end cover inside the hydraulic barrel is designed to be inclined, and the outer surface of the end cover is provided with a second sealing ring.

[0008] The second sealing ring is matched with the outer surface of the end cover, the gap between the end cover and the hydraulic barrel can be blocked, the fixing bolt can fix the hydraulic barrel and the end cover, and the end cover can be easily disassembled for maintenance.

[0009] Preferably, the outer surface of the hydraulic barrel is provided with an oil inlet penetrating the outer surface of the hydraulic barrel, the oil inlet is located at two ends of the hydraulic barrel, the first shaft body is provided with a communication pipe penetrating the inside of the first shaft body, one end of the communication pipe is located at one side of the second shaft body, a gap is left between one end of the first shaft body and the hydraulic barrel, and a gap is left between the first shaft body and the second shaft body.

[0010] The hydraulic oil injected through the oil inlet at one end of the hydraulic barrel can drive the second shaft body to move, and after the second shaft body moves to the limit, the first shaft body moves together to realize the extension of the first shaft body and the second shaft body, the hydraulic oil injected through the oil inlet at the other end of the hydraulic barrel can enter the inside of the first shaft body through the communication pipe, the second shaft body can be retracted, and after the second shaft body is retracted into the inside of the first shaft body, the first shaft body is retracted into the inside of the hydraulic barrel together to realize the retraction of the first shaft body and the second shaft body.

[0011] Preferably, the outer surface of one end of the first shaft body and the second shaft body is provided with a guide ring, the first sealing ring is matched with the outer surfaces of the first shaft body and the second shaft body, and the guide ring is matched with the outer surfaces of the first shaft body and the second shaft body.

[0012] The technical scheme can realize the sealing between the first shaft body and the hydraulic barrel, and the sealing between the second shaft body and the first shaft body, so that the hydraulic barrel, the first shaft body and the second shaft body cannot be depressurized after the hydraulic oil is injected, and thus the reciprocating motion cannot be performed, the guide ring can play a guiding role, improve the sealing property and wear resistance, bear the lateral force and play a supporting role, and the service life and stability of the hydraulic oil cylinder are improved.

[0013] Preferably, the first shaft body, the second shaft body and the screw cap are provided with a press-fit fixing mechanism, which can prevent dust and impurities outside from entering between the hydraulic barrel and the first shaft body, and reduce the wear probability of the third sealing ring.

[0014] The technical scheme can prevent dust and impurities from entering the gap between the hydraulic barrel, the first shaft body and the second shaft body, reduce the wear probability of the third sealing ring after the third sealing ring contacts the dust and impurities, and improve the durability of the third sealing ring.

[0015] Preferably, the press-fit fixing mechanism comprises clamping pieces which pass through the first shaft body and the second shaft body respectively, and dustproof rings which are respectively inserted into the outer surfaces of the second shaft body and the first shaft body, the dustproof rings are in sliding friction connection with the outer surfaces of the first shaft body and the second shaft body respectively, the dustproof rings are located between the screw cap and the clamping pieces, the outer surface of the clamping piece is provided with a fixing screw, the fixing screw is in threaded connection with the screw cap, and the hydraulic barrel, the first shaft body, the second shaft body, the screw cap and the clamping piece are concentrically designed.

[0016] The technical scheme can conveniently fix the clamping pieces on the outer surface of the screw cap by the fixing screw, so that the dustproof rings can be conveniently fixed between the screw cap and the clamping pieces, and can be conveniently replaced after wear without the need of overall disassembly of the multi-stage hydraulic oil cylinder.

[0017] Compared with the prior art, the multi-stage hydraulic oil cylinder with the stepped progressive sealing structure has the following beneficial effects:

[0018] 1. After long-term use, the third sealing ring will inevitably be worn and cause hydraulic oil leakage, at this time, the screw cap can be rotated, the screw cap is unscrewed from the outer surfaces of the end cover and the first shaft body, the third sealing ring and the screw cap can be removed from the first shaft body and the second shaft body, and then the third sealing ring can be disassembled and replaced, so that the third sealing ring can be conveniently maintained without overall disassembly of the multi-stage hydraulic oil cylinder after wear.

[0019] 2. The grooves on the outer surfaces of the screw cap and the snap-fit ​​piece provide friction for screwing the screw cap. The dustproof ring can scrape and isolate dust and impurities on the outer surfaces of the first and second shafts, preventing dust and impurities from causing wear to the third sealing ring. When the dustproof ring is worn and needs to be replaced, simply remove the fixing screws to remove the snap-fit ​​piece and take out the dustproof ring, making it easy to remove and replace the dustproof ring.

[0020] 3. When hydraulic oil enters the shaftless end of the hydraulic tank through the oil inlet, the hydraulic oil will push the second shaft to move. After the second shaft moves into place, it can push the first shaft to continue moving, allowing the first and second shafts to extend out of the hydraulic tank. When hydraulic oil is injected into the shafted end of the hydraulic tank through the oil inlet, the hydraulic oil will enter the interior of the first shaft through the connecting pipe, allowing the hydraulic oil to push the second shaft to move and retract into the interior of the first shaft. As the second shaft moves, it pushes the first shaft to move, allowing the first and second shafts to retract into the interior of the hydraulic tank, enabling the first and second shafts to perform reciprocating motion inside the hydraulic tank.

[0021] 4. As the first shaft and the second shaft move, the guide ring will guide and support the first shaft and the second shaft, making the first shaft and the second shaft more stable when moving, so as to reduce the wear of the first sealing ring when the first shaft and the second shaft move. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the hydraulic tank and oil inlet of this utility model;

[0023] Figure 2 This is a three-dimensional cross-sectional view of the hydraulic tank and mounting ears of this utility model;

[0024] Figure 3 This is a three-dimensional structural diagram of the first and second shafts of this utility model;

[0025] Figure 4 This is a cross-sectional perspective view of the screw cap and snap-fit ​​piece of this utility model.

[0026] Figure 5 This is a cross-sectional perspective view of the first and second shafts of this utility model.

[0027] Figure 6 This is an exploded three-dimensional structural diagram of the hydraulic tank and the first shaft of this utility model.

[0028] In the diagram: 1. Hydraulic tank; 2. Mounting ear; 3. Oil inlet; 4. First shaft; 5. Second shaft; 6. Guide ring; 7. First sealing ring; 8. Connecting pipe; 9. End cap; 10. Second sealing ring; 11. Fixing bolt; 12. Screw cap; 13. Third sealing ring; 14. Dustproof ring; 15. Snap-fit ​​piece; 16. Fixing screw. Detailed Implementation

[0029] 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.

[0030] Please see Figures 1-6 This utility model provides a technical solution: a multi-stage hydraulic cylinder with a stepped progressive sealing structure, including a hydraulic tank 1, mounting ears 2 fixedly installed on the outer surface of the hydraulic tank 1, and the mounting ears 2 are symmetrically arranged, a first shaft 4 is slidably installed inside the hydraulic tank 1, and a second shaft 5 is slidably installed inside the first shaft 4, an end cap 9 is fitted to the outer surface of one end of the hydraulic tank 1, and the outer surface of the end cap 9 is fitted to the outer surface of the hydraulic tank 1, and threaded mechanisms are respectively provided on the outer surfaces of the first shaft 4 and the second shaft 5, so that the first shaft 4 and the second shaft 5 can be sealed conveniently through the threaded mechanisms and can be easily replaced.

[0031] The hydraulic cylinder 1 can be installed by installing ear 2, so that the multi-stage hydraulic cylinder can perform oscillating reciprocating motion.

[0032] The threaded mechanism includes: a screw cap 12, which is threaded onto the outer surfaces of the end cap 9 and the first shaft 4 respectively, and the outer surfaces of the first shaft 4 and the second shaft 5 are not in contact with the screw cap 12. The outer surface of the screw cap 12 is uniformly provided with grooves, and the inner surface of the screw cap 12 is fitted with a third sealing ring 13, and the outer surface of the third sealing ring 13 is in contact with the outer surfaces of the first shaft 4 and the second shaft 5 respectively.

[0033] After prolonged use, when the third sealing ring 13 wears down, causing hydraulic oil to leak out from the hydraulic tank 1, the first shaft 4, and the second shaft 5, the screw cap 12 can be unscrewed from the end cover 9 and the first shaft 4. The screw cap 12 and the third sealing ring 13 can then be removed from the first shaft 4 and the second shaft 5. The third sealing ring 13 can then be easily removed from the screw cap 12 and replaced with a new one. After that, the third sealing ring 13 and the screw cap 12 can be inserted and screwed back into place. This allows for convenient replacement of the third sealing ring 13 without disassembling the entire multi-stage hydraulic cylinder, facilitating maintenance.

[0034] A fixing bolt 11 is installed through the outer surface of the hydraulic tank 1 and the end cover 9, and the outer surface of the fixing bolt 11 is in contact with the outer surface of the hydraulic tank 1 and the end cover 9 respectively. The end of the end cover 9 located inside the hydraulic tank 1 is designed to be inclined. A second sealing ring 10 is installed on the outer surface of the end cover 9, and the outer surface of the second sealing ring 10 is in contact with the outer surface of the hydraulic tank 1.

[0035] The hydraulic cylinder 1 and the end cover 9 can be fixed and installed by fixing bolts 11, so that the end cover 9 can be inserted into the interior of the hydraulic cylinder 1 and the second sealing ring 10 can be tightly attached to the interior of the hydraulic cylinder 1, so that the hydraulic cylinder 1 and the end cover 9 can maintain a seal and facilitate disassembly when performing maintenance and repair on the interior of the hydraulic cylinder.

[0036] The outer surface of the hydraulic tank 1 is provided with an oil inlet 3, and the oil inlet 3 is located at both ends of the hydraulic tank 1. A connecting pipe 8 is fixedly opened inside the first shaft 4, and one end of the connecting pipe 8 is located on one side of the second shaft 5. A gap is left between one end of the first shaft 4 and the hydraulic tank 1, and a gap is left between the first shaft 4 and the second shaft 5.

[0037] When hydraulic oil is injected into the shaftless cavity of the hydraulic tank 1 through the oil inlet 3, the hydraulic oil will push the second shaft 5 to move, allowing the second shaft 5 to slide inside the first shaft 4. After the second shaft 5 has completely reached one end of the first shaft 4, it will continue to push the first shaft 4 to move, so that the first shaft 4 and the second shaft 5 can completely extend out of the hydraulic tank 1. When hydraulic oil is injected into the shafted cavity of the hydraulic tank 1 through the oil inlet 3, the hydraulic oil will enter the interior of the first shaft 4 through the connecting pipe 8, allowing the hydraulic oil to push the first shaft 4 and reset it. After the first shaft 4 moves into place, it can push the second shaft 5 to continue moving, allowing the first shaft 4 and the second shaft 5 to retract into the interior of the hydraulic tank 1, allowing the first shaft 4 and the second shaft 5 to extend and retract inside the hydraulic tank 1.

[0038] A guide ring 6 is engaged with one end of the outer surface of the first shaft 4 and the second shaft 5. A first sealing ring 7 is engaged with one end of the first shaft 4 and the second shaft 5 near the guide ring 6. The first sealing ring 7 is in contact with the outer surface of the hydraulic tank 1 and the first shaft 4 respectively. The guide ring 6 is in contact with the outer surface of the hydraulic tank 1 and the first shaft 4 respectively.

[0039] The guide ring 6 makes the first shaft 4 and the second shaft 5 more stable during movement, allowing the first shaft 4 and the second shaft 5 to be guided, withstand lateral forces, improve sealing, and increase support. This ensures that the first shaft 4 and the second shaft 5 maintain stability during movement, reduces the accelerated wear of the first sealing ring 7 caused by unstable movement, and extends the service life of the first sealing ring 7. This also reduces the probability of leakage in the multi-stage hydraulic cylinder and extends the service life of the multi-stage hydraulic cylinder.

[0040] A pressing and fixing mechanism is provided between the first shaft 4, the second shaft 5 and the screw cap 12. The pressing and fixing mechanism can prevent external dust and impurities from entering between the hydraulic tank 1 and the first shaft 4, reducing the probability of wear of the third sealing ring 13. The pressing and fixing mechanism includes: a snap-fit ​​piece 15, which passes through the first shaft 4 and the second shaft 5 respectively. Dust-proof rings 14 are inserted into the outer surfaces of the second shaft 5 and the first shaft 4 respectively. The dust-proof rings 14 are in sliding friction connection with the outer surfaces of the first shaft 4 and the second shaft 5 respectively. The dust-proof rings 14 are located between the screw cap 12 and the snap-fit ​​piece 15. A fixing screw 16 is provided through the outer surface of the snap-fit ​​piece 15, and the fixing screw 16 is threadedly connected to the screw cap 12. The hydraulic tank 1, the first shaft 4, the second shaft 5, the screw cap 12 and the snap-fit ​​piece 15 are concentrically designed.

[0041] When the multi-stage hydraulic cylinder is working, dust and impurities will inevitably adhere to the outer surfaces of the first shaft 4 and the second shaft 5. At this time, the dust-proof ring 14 will scrape off all the dust and impurities on the outer surfaces of the first shaft 4 and the second shaft 5, preventing the dust and impurities from causing wear to the third sealing ring 13. When the dust-proof ring 14 is worn and needs to be replaced, simply remove the fixing screw 16, remove the snap-fit ​​piece 15 from the screw cap 12, then remove the dust-proof ring 14 from the first shaft 4 or the second shaft 5, insert the new dust-proof ring 14 back into the outer surfaces of the first shaft 4 and the second shaft 5, and reinstall the snap-fit ​​piece 15 and the fixing screw 16. This allows for convenient replacement of the dust-proof ring 14 without disassembling the multi-stage hydraulic cylinder.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage hydraulic cylinder with a stepped progressive sealing structure, comprising a hydraulic tank (1), wherein mounting ears (2) are fixedly installed on the outer surface of the hydraulic tank (1), and the mounting ears (2) are symmetrically arranged; a first shaft (4) is slidably installed inside the hydraulic tank (1), and a second shaft (5) is slidably installed inside the first shaft (4); an end cap (9) is fitted to the outer surface of one end of the hydraulic tank (1), and the outer surface of the end cap (9) is fitted to the outer surface of the hydraulic tank (1), characterized in that: The outer surfaces of the first shaft (4) and the second shaft (5) are respectively provided with threaded mechanisms, which facilitate sealing between the first shaft (4) and the second shaft (5) and make it easy to replace them.

2. A multi-stage hydraulic cylinder with a stepped progressive sealing structure according to claim 1, characterized in that: The threaded mechanism includes: a screw cap (12), which is threadedly installed on the outer surfaces of the end cap (9) and the first shaft (4), respectively, and the outer surfaces of the first shaft (4) and the second shaft (5) are not in contact with the screw cap (12). The outer surface of the screw cap (12) is uniformly provided with grooves, and the inner surface of the screw cap (12) is fitted with a third sealing ring (13), and the outer surface of the third sealing ring (13) is in contact with the outer surfaces of the first shaft (4) and the second shaft (5).

3. A multi-stage hydraulic cylinder with a stepped progressive sealing structure according to claim 1, characterized in that: The outer surfaces of the hydraulic barrel (1) and the end cap (9) are fitted with fixing bolts (11), and the outer surfaces of the fixing bolts (11) are respectively attached to the outer surfaces of the hydraulic barrel (1) and the end cap (9). The end of the end cap (9) located inside the hydraulic barrel (1) is designed to be inclined. The outer surface of the end cap (9) is fitted with a second sealing ring (10), and the outer surface of the second sealing ring (10) is attached to the outer surface of the hydraulic barrel (1).

4. A multi-stage hydraulic cylinder with a stepped progressive sealing structure according to claim 1, characterized in that: The outer surface of the hydraulic tank (1) is provided with an oil inlet (3), and the oil inlet (3) is located at both ends of the hydraulic tank (1). The first shaft (4) is fixedly provided with a connecting pipe (8), and one end of the connecting pipe (8) is located on one side of the second shaft (5). A gap is left between one end of the first shaft (4) and the hydraulic tank (1), and a gap is left between the first shaft (4) and the second shaft (5).

5. A multi-stage hydraulic cylinder with a stepped progressive sealing structure according to claim 1, characterized in that: A guide ring (6) is engaged with one end of the outer surface of the first shaft (4) and the second shaft (5). A first sealing ring (7) is engaged with one end of the first shaft (4) and the second shaft (5) near the guide ring (6). The first sealing ring (7) is in contact with the outer surface of the hydraulic tank (1) and the first shaft (4) respectively. The guide ring (6) is in contact with the outer surface of the hydraulic tank (1) and the first shaft (4) respectively.

6. A multi-stage hydraulic cylinder with a stepped progressive sealing structure according to claim 1, characterized in that: A pressing and fixing mechanism is provided between the first shaft (4), the second shaft (5) and the screw cap (12). The pressing and fixing mechanism can prevent external dust and impurities from entering between the hydraulic tank (1) and the first shaft (4), reducing the probability of wear of the third sealing ring (13).

7. A multi-stage hydraulic cylinder with a stepped progressive sealing structure according to claim 6, characterized in that: The pressing and fixing mechanism includes: a snap-fit ​​piece (15), which passes through the first shaft (4) and the second shaft (5) respectively, and a dustproof ring (14) is inserted into the outer surface of the second shaft (5) and the first shaft (4) respectively. The dustproof ring (14) is connected to the outer surface of the first shaft (4) and the second shaft (5) by sliding friction. The dustproof ring (14) is located between the screw cap (12) and the snap-fit ​​piece (15), and a fixing screw (16) is provided through the outer surface of the snap-fit ​​piece (15). The fixing screw (16) is threadedly connected to the screw cap (12). The hydraulic tank (1), the first shaft (4), the second shaft (5), the screw cap (12) and the snap-fit ​​piece (15) are concentrically designed.

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