A self-sealing ultra-high pressure thin-wall cylinder

Abstract

The invention relates to a self-sealing ultra-high pressure thin-wall oil cylinder, comprising a cylinder barrel and a piston rod slidably arranged in the cylinder barrel, a cylinder cover is arranged between the cylinder barrel and the piston rod, an installation groove a is provided on the piston rod, a metal guide ring is arranged in the installation groove a, a plurality of accommodating grooves, limiting holes and through hole a are circumferentially provided on the metal guide ring, a limiting block is slidably arranged in the accommodating groove, a plurality of rotating seats are arranged inside the piston rod, a baffle is rotatably arranged on the rotating seat, a through hole b is provided on the piston rod corresponding to the through hole a, when the piston rod is lifted, the baffle continuously blocks the through hole b, when the piston rod is lowered and reset, the baffle releases the blocking of the through hole b, so that oil passes through the through hole b and the through hole a to push the limiting block outward to contact the inner wall of the cylinder barrel, when the piston rod is lowered, the limiting block plays a buffering role on the piston rod, thereby reducing the wear caused by the friction between the piston rod and the inner wall of the cylinder barrel, and improving the service life of the piston rod.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to a self-sealing ultra-high pressure thin-wall oil cylinder. Background Art

[0002] Thin-wall hydraulic cylinders are widely used in various machinery and equipment, especially in mobile equipment and precision machinery, such as some light industrial machinery, automation equipment, small vehicles, etc., and are very popular for their lightness and compactness. However, due to the thin wall thickness, they are more sensitive to changes in internal and external pressures and may not be as resistant to high pressure and wear as traditional hydraulic cylinders. Therefore, the sealing and durability of thin-walled cylinders are the key.

[0003] A Chinese utility model patent with publication number CN201779088U discloses a high-pressure ultra-thin oil cylinder, comprising a cylinder body, a plunger arranged in the cylinder body, and a dust ring between the cylinder body and the plunger; wherein the dust ring is pressed against the cylinder head by a gland, and a lip is arranged on the dust ring, and the lip of the dust ring is fitted and connected with the plunger surface. The high-pressure ultra-thin oil cylinder provided by the utility model not only meets the dustproof requirements of the high-pressure ultra-thin oil cylinder, but also has an easy replacement of the dust ring, and is durable and not easy to deform.

[0004] However, its structure is relatively complicated, and its piston rod is more prone to wear during movement and cannot be effectively protected.

[0005] A Chinese invention patent with the publication number CN117989194A discloses a thin oil cylinder for vertical jacking, including a shell, a first-stage oil cylinder, a second-stage oil cylinder, a third-stage oil cylinder and a contact head, wherein the first-stage oil cylinder is slidably connected to the shell, the second-stage oil cylinder is slidably connected to the first-stage oil cylinder, the third-stage oil cylinder is slidably connected to the second-stage oil cylinder, and the contact head is installed at the end of the third-stage oil cylinder, a hydraulic oil hole for extending is provided on one side of the head end of the shell, a retraction oil hole is provided on one side of the end of the shell, and a first retraction oil pipe and a second retraction oil pipe are provided on the inner walls of the first-stage oil cylinder and the second-stage oil cylinder, respectively. The present invention adopts a three-stage oil cylinder for jacking, and the length is 732mm in the non-working state, the volume is small, and it is convenient to install and construct in a small space, and the total length in the working state is 2237.5mm, which meets the length requirement of the pipe section for one jacking, and the length in the first-stage working state is 1274mm, and the total length in the second-stage working state is 1776mm, which is convenient for jacking construction.

[0006] However, it does not have a clear buffer mechanism, so the piston rod still cannot reduce wear well during movement, and it is simply sealed by a sealing ring, and the sealing effect is limited. Summary of the invention

[0007] The purpose of the present invention is to address the deficiencies in the prior art and provide a self-sealing ultra-high pressure thin-walled oil cylinder, comprising a cylinder barrel and a piston rod slidably arranged in the cylinder barrel, a cylinder cover is arranged between the cylinder barrel and the piston rod, an installation groove a is provided on the piston rod, a metal guide ring is arranged in the installation groove a, a plurality of accommodating grooves, limiting holes and through hole a are circumferentially provided on the metal guide ring, a limiting block is slidably arranged in the accommodating groove, a plurality of rotating seats are arranged inside the piston rod, a baffle is rotatably arranged on the rotating seat, and a through hole b is provided on the piston rod corresponding to the through hole a, thereby solving the problems of poor sealing effect of the thin-walled oil cylinder in the prior art and inability to effectively reduce the wear of the piston rod.

[0008] The technical solutions of the present invention are as follows:

[0009] A self-sealing ultra-high pressure thin-wall oil cylinder comprises a cylinder barrel and a piston rod slidably arranged in the cylinder barrel, a cylinder cover is arranged between the cylinder barrel and the piston rod, an installation groove a is provided on the piston rod, a metal guide ring is arranged in the installation groove a, a plurality of accommodating grooves, limiting holes and through hole a are circumferentially provided on the metal guide ring, a limiting block is slidably arranged in the accommodating groove, a plurality of rotating seats are provided inside the piston rod, a baffle is rotatably arranged on the rotating seat, a through hole b is provided on the piston rod corresponding to the through hole a, when the piston rod is lifted, the baffle continuously blocks the through hole b, and when the piston rod is lowered and reset, the baffle releases the blocking of the through hole b, so that the oil passes through the through hole b and the through hole a to push the limiting block outward to contact the inner wall of the cylinder barrel.

[0010] As a preferred embodiment, a telescopic rod is fixedly connected to the corresponding limiting hole at the bottom of the limiting block, and a spring is wound around the telescopic rod.

[0011] As a preference, a curved plate is fixedly connected to the front end of the baffle.

[0012] As a preferred embodiment, a dust ring is provided between the cylinder cover and the piston rod, and a mounting groove b and a mounting groove c are provided on the cylinder cover.

[0013] As a preferred embodiment, a sealing ring is arranged in the installation groove b, and a blocking piece a is arranged on one side of the sealing ring.

[0014] As a preferred embodiment, an O-ring is provided in the installation groove c, and a baffle b is provided on one side of the O-ring.

[0015] As a preference, an oil inlet is provided at the rear end of the cylinder.

[0016] As a preference, the fitting clearance range between the inner hole of the cylinder head and the outer diameter of the piston rod is set to 0.01mm~0.03mm, and the fitting clearance range between the inner diameter of the cylinder barrel and the outer diameter of the cylinder head is set to 0.01mm~0.03mm.

[0017] As another preferred embodiment, the cylinder diameter of the cylinder is set to 60 mm, and the wall thickness of the cylinder is set to 3 mm.

[0018] The beneficial effects of the present invention are

[0019] The present invention is provided with a metal guide ring and a baffle, which can play a supporting and limiting role through the metal guide ring. A plurality of accommodating grooves are provided on the circumference of the metal guide ring, and a limit block that can slide up and down is provided in the accommodating groove. A through hole a connected with the bottom of the accommodating groove is provided on the metal guide ring. At the same time, the through hole a is also connected with the through hole b provided on the piston rod. The baffle is rotatably arranged below the through hole b through a rotating seat. When the piston rod is lifted, the baffle can keep covering the through hole b so that oil does not enter the through hole a and the through hole b. At this time, the limit block is stored in the accommodating groove, and the piston rod can smoothly complete the lifting. When the piston rod descends and resets, the oil reverses the baffle outwards through the pushing arc plate, so that the oil can pass through the through hole b and the through hole a to push the limit block outwards for a small distance to contact the inner wall of the cylinder barrel. The limit block plays a buffering role on the piston rod when the piston rod descends, reduces the wear caused by the friction between the piston rod and the inner wall of the cylinder barrel, and improves the service life of the piston rod.

[0020] A small amount of the oil entering through hole a and through hole b can seep out from the gap of the receiving groove to lubricate the limit block and the cylinder barrel, thereby preventing the limit block from contacting and rubbing with the cylinder barrel and wearing the inner wall of the cylinder barrel.

[0021] In the present invention, the fitting clearance range between the inner hole of the cylinder head and the outer diameter of the piston rod is set to 0.01mm~0.03mm, so that the sealing ring can withstand ultra-high pressure without being squeezed and damaged. Similarly, the fitting clearance range between the inner diameter of the cylinder and the outer diameter of the cylinder head is also controlled to be 0.01mm~0.03mm, which can prevent the sealing ring from being squeezed and damaged.

[0022] In summary, the present invention has the advantages of increasing the overall service life of the piston rod and the cylinder barrel, having a good linkage effect, and having an ingenious structure, and is suitable for the technical field of hydraulic cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the cross-sectional structure of the self-sealing ultra-high pressure thin-wall oil cylinder;

[0025] Figure 2 for Figure 1 A magnified schematic diagram of point A;

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the metal guide ring;

[0027] Figure 4It is a schematic diagram of the state when the piston rod is lifted;

[0028] Figure 5 for Figure 4 An enlarged schematic diagram of point B;

[0029] Figure 6 for Figure 4 An enlarged schematic diagram of point C;

[0030] Figure 7 It is a schematic diagram of the state when the piston rod descends and resets;

[0031] Figure 8 for Figure 7 An enlarged schematic diagram of point D;

[0032] Fig. 9 for Figure 7 Enlarged schematic diagram of point E.

[0033] In the figure: cylinder 1, piston rod 2, cylinder head 3, metal guide ring 4, oil inlet 11, mounting groove a21, rotating seat 22, baffle 23, through hole b24, arc plate 25, dust ring 31, mounting groove b32, mounting groove c33, sealing ring 34, baffle a35, O-ring 36, baffle b37, accommodating groove 41, limiting hole 42, through hole a43, limiting block 44, telescopic rod 45, spring 46. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Embodiment 1

[0035] like Figures 1 to 9As shown, a self-sealing ultra-high pressure thin-wall oil cylinder comprises a cylinder barrel 1 and a piston rod 2 slidably arranged in the cylinder barrel 1, a cylinder cover 3 is arranged between the cylinder barrel 1 and the piston rod 2, a mounting groove a21 is provided on the piston rod 2, a metal guide ring 4 is arranged in the mounting groove a21, a plurality of accommodating grooves 41, limiting holes 42 and through holes a43 are circumferentially provided on the metal guide ring 4, a limiting block 44 is slidably arranged in the accommodating groove 41, a plurality of rotating seats 22 are provided inside the piston rod 2, a baffle 23 is rotatably arranged on the rotating seat 22, a through hole b24 is provided on the piston rod 2 corresponding to the through hole a43, when the piston rod 2 is lifted, the baffle 23 continuously blocks the through hole b24, when the piston rod 2 is lowered and reset, the baffle 23 releases the blocking of the through hole b24, so that the oil passes through the through hole b24 and the through hole a43 to push the limiting block 44 outward to contact the inner wall of the cylinder barrel 1. The piston rod 3 is composed of a rod head and a hollow rod welded together; the metal guide ring 4 can be used for support and limitation, and a plurality of receiving grooves 41 are provided on the circumference of the metal guide ring 4, and a limit block 44 that can slide up and down is provided in the receiving groove 41, and the shape and size of the limit block 44 match the receiving groove 41, and a through hole a43 connected to the bottom of the receiving groove 41 is provided on the metal guide ring 4, and at the same time, the through hole a43 is also connected to the through hole b24 provided on the piston rod 2, and the baffle 23 is rotatably arranged below the through hole b24 through the rotating seat 22. When the piston rod 2 is lifted, the baffle 23 is under the action of the oil. The through hole b24 can be covered so that the oil will not enter the through hole a43 and the through hole b24. At this time, the limit block 44 is received in the accommodating groove 41, and the piston rod 2 can smoothly complete the lifting. When the piston rod 2 descends and resets, the oil pushes the arc plate 25 to reverse the baffle 23 outward, so that the oil can pass through the through hole b24 and the through hole a43 to push the limit block 44 outward for a small distance to contact the inner wall of the cylinder 1. The limit block 44 plays a buffering role on the piston rod 2 when the piston rod 2 descends, thereby reducing the wear caused by the friction between the piston rod 2 and the inner wall of the cylinder 1, and improving the service life of the piston rod 2.

[0036] like Figure 5 and Figure 8 As shown, a telescopic rod 45 is fixedly connected to the bottom of the limit block 44 corresponding to the limit hole 42, and a spring 46 is wound around the telescopic rod 45. The limit block 44 is slidably arranged in the receiving groove 41 through the telescopic rod 45, and the telescopic rod 45 can limit the limit block 44 to prevent the limit block 44 from deflecting. The telescopic rod 45 is slidably arranged in the limit hole 42, and the limit block 44 can be reset after being pushed outward by the spring 46.

[0037] like Figure 6 and Fig. 9As shown, the front end of the baffle 23 is fixedly connected with an arc plate 25. When the piston rod 2 descends and resets, the oil pushes the arc plate 25 to reverse the baffle 23 outward, so that the oil can pass through the through hole b24 and the through hole a43 to push the limit block 44 outward for a small distance to contact the inner wall of the cylinder 1. The limit block 44 plays a buffering role on the piston rod 2 when the piston rod 2 descends, reducing the wear caused by the friction between the piston rod 2 and the inner wall of the cylinder 1.

[0038] like Figure 2 As shown, a dust ring 31 is arranged between the cylinder cover 3 and the piston rod 2, and a mounting groove b32 and a mounting groove c33 are provided on the cylinder cover 3. The dust ring 31 is provided to prevent dust and dirt; the mounting groove b32 and the mounting groove c33 are used to install a sealing ring 34 and an O-ring 36 respectively.

[0039] like Figure 2 As shown, a sealing ring 34 is arranged in the installation groove b32, and a baffle a35 is arranged on one side of the sealing ring 34. The baffle a35 is made of polytetrafluoroethylene, which plays a buffering role for the sealing ring 34 when the sealing ring 34 is subjected to ultra-high pressure. The sealing ring 34 cooperates with the baffle a35 to play a good sealing role.

[0040] like Figure 2 As shown, an O-ring 36 is arranged in the installation groove c33, and a baffle b37 is arranged on one side of the O-ring 36. The baffle b37 is also made of polytetrafluoroethylene, which plays a buffering role for the O-ring 36 when the O-ring 36 is subjected to ultra-high pressure. The O-ring and the baffle b37 can further enhance the sealing effect, and the sealing effect is better than that of simply relying on the sealing ring 34 for sealing.

[0041] like Figure 1 , Figure 4 and Figure 7 As shown, the tail end of the cylinder 1 is provided with an oil inlet 11. The sealing cover of the oil inlet 11 is threaded, and the thread is sealed with a sealing cone pipe thread instead of an O-ring or a combination gasket, which can achieve a better sealing effect.

[0042] like Figure 1 As shown, the clearance range between the inner hole of the cylinder head 3 and the outer diameter of the piston rod 2 is set to 0.01mm~0.03mm, and the clearance range between the inner diameter of the cylinder barrel 1 and the outer diameter of the cylinder head 3 is set to 0.01mm~0.03mm. The clearance range between the inner hole of the cylinder head 3 and the outer diameter of the piston rod 2 is set to 0.01mm~0.03mm, so that the sealing ring 34 can withstand ultra-high pressure without being squeezed. Similarly, the clearance range between the inner diameter of the cylinder barrel 1 and the outer diameter of the cylinder head 3 is also controlled to be 0.01mm~0.03mm, which can prevent the sealing ring 34 from being squeezed. Embodiment 2

[0043] like Figure 1As shown, the same or corresponding parts as those in the first embodiment are marked with the corresponding reference numerals of the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The difference between the second embodiment and the first embodiment is that the cylinder diameter of the cylinder barrel 1 is set to 60mm, and the wall thickness of the cylinder barrel 1 is set to 3mm. The cylinder diameter of the cylinder barrel 1 is set to 60mm, and the wall thickness is set to 3mm, which can meet the use under the working pressure of 31.5MPa. Compared with the thin-walled oil cylinder, the wall thickness is reduced by 40%, and the oil cylinder is lighter and convenient for customers to install. In addition, the material of the cylinder barrel 1 is made of a new high-strength alloy composite material, including two or more materials such as high-carbon steel, high-strength aluminum alloy and brass.

[0044] Working process

[0045] When the oil in the oil inlet 11 drives the piston rod 2 to lift, the baffle 23 keeps covering the through hole b24 so that the oil does not enter the through hole a43 and the through hole b24. At this time, the limit block 44 is received in the accommodating groove 41, and the piston rod 2 can smoothly complete the lifting. When the piston rod 2 is reset by descending by its own weight, the oil descends and pushes the arc plate 25 to reverse the baffle 23 outward, so that the oil can pass through the through hole b24 and the through hole a43 to push the limit block 44 outward for a small distance to contact the inner wall of the cylinder 1. The limit block 44 plays a buffering role on the piston rod 2 when the piston rod 2 descends, thereby reducing the wear caused by the friction between the piston rod 2 and the inner wall of the cylinder 1.

[0046] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front and back", "left and right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0047] Of course, in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0048] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art under the technical guidance of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A self-sealing ultra-high pressure thin-wall oil cylinder, comprising a cylinder barrel (1) and a piston rod (2) slidably arranged in the cylinder barrel (1), a cylinder cover (3) being arranged between the cylinder barrel (1) and the piston rod (2), characterized in that: The piston rod (2) is provided with a mounting groove a (21), a metal guide ring (4) is arranged in the mounting groove a (21), a plurality of accommodating grooves (41), limiting holes (42) and through holes a (43) are arranged on the circumference of the metal guide ring (4), a limiting block (44) is slidably arranged in the accommodating groove (41), a plurality of rotating seats (22) are arranged inside the piston rod (2), a baffle (23) is rotatably arranged on the rotating seat (22), a through hole b (24) is provided on the piston rod (2) corresponding to the through hole a (43), when the piston rod (2) is lifted, the baffle (23) continuously blocks the through hole b (24), when the piston rod (2) is lowered and reset, the baffle (23) releases the blocking of the through hole b (24), so that oil passes through the through hole b (24) and the through hole a (43) to push the limiting block (44) outward to contact the inner wall of the cylinder barrel (1).

2. A self-sealing ultra-high pressure thin-wall oil cylinder according to claim 1, characterized in that: A telescopic rod (45) is fixedly connected to the bottom of the limiting block (44) corresponding to the limiting hole (42), and a spring (46) is wound around the telescopic rod (45).

3. A self-sealing ultra-high pressure thin-wall oil cylinder according to claim 2, characterized in that: The front end of the baffle (23) is fixedly connected to an arc-shaped plate (25).

4. A self-sealing ultra-high pressure thin-wall oil cylinder according to claim 3, characterized in that: A dust ring (31) is provided between the cylinder cover (3) and the piston rod (2), and a mounting groove b (32) and a mounting groove c (33) are provided on the cylinder cover (3).

5. A self-sealing ultra-high pressure thin-wall oil cylinder according to claim 4, characterized in that: A sealing ring (34) is arranged in the installation groove b (32), and a blocking piece a (35) is arranged on one side of the sealing ring (34).

6. A self-sealing ultra-high pressure thin-wall oil cylinder according to claim 5, characterized in that: An O-ring (36) is arranged in the installation groove c (33), and a blocking piece b (37) is arranged on one side of the O-ring (36).

7. A self-sealing ultra-high pressure thin-wall oil cylinder according to claim 6, characterized in that: The rear end of the cylinder barrel (1) is provided with an oil inlet (11).

8. A self-sealing ultra-high pressure thin-wall oil cylinder according to claim 7, characterized in that: The matching clearance range between the inner hole of the cylinder head (3) and the outer diameter of the piston rod (2) is set to 0.01 mm to 0.03 mm, and the matching clearance range between the inner diameter of the cylinder barrel (1) and the outer diameter of the cylinder head (3) is set to 0.01 mm to 0.03 mm.

9. A self-sealing ultra-high pressure thin-wall oil cylinder according to claim 8, characterized in that: The cylinder diameter of the cylinder (1) is set to 60 mm, and the wall thickness of the cylinder (1) is set to 3 mm.

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