CN214146094U

CN214146094U - Swing valve oil cylinder

Info

Publication number: CN214146094U
Application number: CN202023184126.9U
Authority: CN
Inventors: 吕亚军; 王亮; 徐超
Original assignee: Loudi Zhongxing Hydraulic Parts Co Ltd
Current assignee: Loudi Zhongxing Hydraulic Parts Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-09-07
Anticipated expiration: 2030-12-25

Abstract

The utility model provides a pendulum valve hydro-cylinder, pendulum valve hydro-cylinder includes: a cylinder body provided with a connection hole; the piston rod assembly comprises a sealing boss, and the piston rod assembly is partially arranged in the cylinder body; the swing valve oil cylinder further comprises a floating buffer sleeve and a limiting piece, a mounting groove is formed in the hole wall of the connecting hole, and the limiting piece is fixed on the groove wall of the mounting groove. The technical scheme of the utility model, sealed boss moves along with piston rod assembly continues to move right, can cause the impact for the cushion collar that floats, so that the cushion collar that floats swings towards the tank bottom surface of mounting groove, be close to the tank bottom surface of mounting groove gradually, make the oil return cross-section in rodless chamber become littleer like this, the resistance that returns becomes bigger, buffering effect to piston rod assembly is better, thereby ensure that piston rod assembly can support slowly and lean on the cylinder block, so as to avoid piston rod assembly to cause great impact and lead to the problem that the pendulum valve hydro-cylinder damaged to the cylinder block, and then ensure that the pendulum valve hydro-cylinder can normally work.

Description

Swing valve oil cylinder

Technical Field

The utility model relates to a hydro-cylinder technical field particularly, relates to a pendulum valve hydro-cylinder.

Background

At present, the swing valve oil cylinder belongs to a special class of oil cylinders, and is mostly used in high-speed, high-pressure and high-frequency working conditions, for example, the frequency can reach 26 times/min. The swing valve oil cylinder generally uses a one-way valve as a buffering structure, but the one-way valve has poor buffering effect under the working conditions of high speed, high pressure and high frequency, so that a piston rod assembly causes great impact on a cylinder seat, and the swing valve oil cylinder is possibly damaged.

SUMMERY OF THE UTILITY MODEL

The present invention aims at least solving one of the technical problems existing in the prior art or the related art.

Therefore, the utility model aims to provide a pendulum valve hydro-cylinder.

In order to achieve the above object, an embodiment of the utility model provides a pendulum valve hydro-cylinder, the pendulum valve hydro-cylinder includes: a cylinder body provided with a connection hole; the piston rod assembly comprises a sealing boss, the piston rod assembly is partially arranged in the cylinder body, and the piston rod assembly can move in the cylinder body in a telescopic mode; the swing valve oil cylinder further comprises a floating buffer sleeve and a limiting part, a mounting groove is formed in the hole wall of the connecting hole, the limiting part is fixed to the groove wall of the mounting groove, the floating buffer sleeve is arranged on the periphery of the sealing boss, part of the floating buffer sleeve is located in an accommodating space formed by the limiting part and the mounting groove, and the floating buffer sleeve can swing in the accommodating space.

In this technical scheme, when having the interior oil feed of pole chamber, the piston rod subassembly moved right, and sealed boss is close to gradually and wears to produce the cushion collar that floats, and the oil return cross-section in rodless chamber diminishes like this, and the resistance to oil return grow has the buffering effect to the piston rod subassembly. Sealed boss moves along with piston rod assembly continues to the right, can cause the impact for the cushion collar that floats, so that the cushion collar that floats swings towards the tank bottom surface of mounting groove, be close to the tank bottom surface of mounting groove gradually, make the oil return cross-section in rodless chamber become littleer like this, the resistance that returns is bigger, it is better to the buffering effect of piston rod assembly, thereby ensure that piston rod assembly can support slowly and lean on the cylinder block, so as to avoid the piston rod assembly to cause great impact and lead to the problem that the pendulum valve hydro-cylinder damaged to the cylinder block, and then ensure that the pendulum valve hydro-cylinder can normally work.

Additionally, the utility model provides an in the above-mentioned embodiment pendulum valve hydro-cylinder can also have following additional technical characterstic:

in above-mentioned technical scheme, the cushion collar that floats is provided with the step face, is provided with a plurality of oil grooves that lead to on the step face, and a plurality of oil grooves that lead to set up along the circumference interval of the cushion collar that floats, and communicate with the connecting hole.

In this technical scheme, when no pole chamber oil feed, the piston rod subassembly moves left, and the cushion collar that floats swings towards the tank bottom face direction of keeping away from the mounting groove gradually, and the oil pressure in no pole intracavity increases in the twinkling of an eye, and fluid is through leading to oil groove and piston rod end face contact for the lifting surface area of fluid reaches the biggest in the twinkling of an eye, makes the piston rod subassembly stretch out from the cylinder fast like this, and then reaches the effect of quick reaction, in order to satisfy the quick reaction requirement of pendulum valve hydro-cylinder.

In any of the above technical solutions, the floating buffer sleeve is provided with a through hole, the sealing boss is arranged in the through hole, and the hole wall surface of the through hole is matched with the peripheral surface of the sealing boss.

In the technical scheme, the hole wall surface of the through hole is matched with the peripheral surface of the sealing boss, so that the hole wall surface of the through hole is tightly attached to the peripheral surface of the sealing boss, oil is prevented from passing through an annular gap formed between the floating buffer sleeve and the sealing boss, and the piston rod assembly is ensured to be normally contracted in the cylinder barrel.

In any of the above technical solutions, one end of the sealing boss is provided with an inner guiding conical surface, an opening of the through hole is provided with an outer guiding conical surface, and the inner guiding conical surface is matched with the outer guiding conical surface.

In the technical scheme, because the inner guide conical surface is matched with the outer guide conical surface, the sealing boss can be rapidly led into the through hole, so that the floating buffer sleeve can be rapidly penetrated and arranged at one end of the sealing boss, the piston rod assembly can be slowly abutted against the cylinder seat, the problem that the swing valve oil cylinder is damaged due to large impact on the cylinder seat by the piston rod assembly is avoided, and the swing valve oil cylinder can normally work.

In any one of the above technical solutions, the piston rod assembly further includes a piston rod, the piston rod has a piston rod end face, and the sealing boss is disposed on the piston rod end face.

In the technical scheme, the end face of the piston rod has a limiting effect and is used for limiting the position of the piston rod assembly moving rightwards, so that the piston rod assembly can be retracted to a preset position. In addition, when the piston rod assembly stretches out, the end face of the piston rod is used as a stress surface of oil, so that the oil can apply enough pressure to the piston rod assembly, the piston rod assembly can stretch out quickly, and the quick response requirement of the swing valve oil cylinder is met.

In any one of the above technical solutions, the piston rod and the sealing boss are provided as an integrally formed structure.

In the technical scheme, the piston rod and the sealing boss are arranged into an integrally formed structure, so that the valve is convenient to manufacture, and the manufacturing cost of the swing valve oil cylinder is reduced. Meanwhile, the connection strength of the piston rod and the sealing boss can be enhanced, so that the connection strength requirement of the piston rod assembly is met.

In any one of the above technical schemes, the swing valve oil cylinder is provided with an oil inlet which is communicated with the connecting hole.

In this technical scheme, fluid accessible oil inlet enters into no pole chamber to ensure fluid can with the contact of piston rod terminal surface, and then ensure that the piston rod subassembly can stretch out from the cylinder block.

In any of the above technical solutions, the cylinder body includes a cylinder barrel and a cylinder base connected with the cylinder barrel, and the connection hole is disposed on the cylinder base.

In the technical scheme, the cylinder body is arranged into a split structure, so that the parts in the swing valve oil cylinder can be conveniently mounted and dismounted, and the mounting and dismounting efficiency of the swing valve oil cylinder and the use convenience of the swing valve oil cylinder are further improved.

In any of the above technical solutions, the swing valve cylinder further includes a sealing member, and the sealing member is disposed at a connection position of the cylinder barrel and the cylinder base.

In the technical scheme, the sealing element is arranged, so that the oil can be prevented from leaking from the joint of the cylinder barrel and the cylinder seat, the waste of the oil and the pollution to the environment are caused, the use cost of the swing valve oil cylinder is saved, and the requirement of environmental protection is met.

In any of the above technical solutions, the limiting member is a retaining ring, a groove wall of the mounting groove is provided with a fixing groove, and the retaining ring is partially fixed in the fixing groove.

In this technical scheme, the retaining ring has limit function, can avoid the buffer sleeve that floats to deviate from in the mounting groove under the effect of fluid impact force to ensure that the buffer sleeve that floats can only swing in the accommodation space that locating part and mounting groove formed, and then ensure that the piston rod subassembly can support slowly and lean on the cylinder block, lead to the problem that the pendulum valve hydro-cylinder damaged in order to avoid the piston rod subassembly to cause great impact to the cylinder block, thereby ensure that the pendulum valve hydro-cylinder can normally work.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a partial cross-sectional view of a pendulum valve cylinder according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a floating cushion collar of the pendulum valve cylinder of FIG. 1;

fig. 3 shows a top view of the floating cushion collar of the pendulum valve cylinder of fig. 2.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:

10. a cylinder body; 12. connecting holes; 14. a cylinder barrel; 142. a rod cavity; 144. a rodless cavity; 16. a cylinder base; 122. an outer guide conical surface; 20. a piston rod assembly; 22. sealing the boss; 24. a piston rod; 242. an end surface of the piston rod; 30. a floating buffer sleeve; 32. a step surface; 321. an inner guiding conical surface; 322. an oil groove is communicated; 34. a through hole; 40. a limiting member; 50. an oil inlet; 60. and a seal.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

It should be noted that the inner cavity of the cylinder 14 of the swing valve cylinder in the present application is divided into a rod chamber 142 and a rodless chamber 144. Wherein, the part of the inner cavity containing the piston rod assembly 20 is a rod cavity 142, the other part of the inner cavity not containing the piston rod assembly 20 is a rodless cavity 144, and the rod cavity 142 is not communicated with the rodless cavity 144. Pressurizing the rod chamber 142, the piston rod assembly 20 moves to the right and the piston rod assembly 20 retracts into the cylinder 14. Pressurizing the rodless chamber 144 and moving the piston rod assembly 20 to the left, the piston rod assembly 20 extends out of the cylinder 14. The receiving space in this application refers to a receiving groove formed by the limiting member 40 and the mounting groove and having a ring structure.

Swing valve cylinders according to some embodiments of the present invention are described below with reference to fig. 1-3.

As shown in fig. 1, the present invention provides a swing valve cylinder, which includes a cylinder body 10 and a piston rod assembly 20. Wherein the cylinder body 10 is provided with a coupling hole 12. Piston rod assembly 20 includes a sealing boss 22, piston rod assembly 20 is partially disposed within cylinder 10, and piston rod assembly 20 is capable of telescopic movement within cylinder 10. The swing valve oil cylinder further comprises a floating buffer sleeve 30 and a limiting piece 40, a mounting groove is formed in the hole wall of the connecting hole 12, the limiting piece 40 is fixed to the groove wall of the mounting groove, the floating buffer sleeve 30 is arranged on the periphery of the sealing boss 22, part of the floating buffer sleeve is located in an accommodating space formed by the limiting piece 40 and the mounting groove, and the floating buffer sleeve 30 can swing in the accommodating space.

In the above arrangement, when oil is fed into the rod cavity 142, the piston rod assembly 20 moves rightwards, the sealing boss 22 gradually approaches and penetrates through the floating buffer sleeve 30, so that the oil return section of the rodless cavity 144 becomes smaller, the oil return resistance becomes larger, and the piston rod assembly 20 is buffered. The sealing boss 22 moves rightwards along with the piston rod assembly 20, and impacts can be caused to the floating buffer sleeve 30, so that the floating buffer sleeve 30 swings towards the groove bottom surface of the installation groove and is gradually close to the groove bottom surface of the installation groove, the oil return section of the rodless cavity 144 becomes smaller, the oil return resistance becomes larger, the buffering effect on the piston rod assembly 20 is better, the piston rod assembly 20 is enabled to be slowly abutted against the cylinder seat 16, the problem that the swing valve oil cylinder is damaged due to the fact that the piston rod assembly 20 causes large impact on the cylinder seat 16 is avoided, and the swing valve oil cylinder is enabled to work normally.

Specifically, as shown in fig. 2 and fig. 3, in the embodiment of the present invention, the floating buffering sleeve 30 is provided with a step surface 32, the step surface 32 is provided with a plurality of oil through grooves 322, and the plurality of oil through grooves 322 are arranged along the circumferential interval of the floating buffering sleeve 30 and are communicated with the connecting hole 12.

In the above-mentioned setting, when no pole chamber 144 oil feed, piston rod assembly 20 moves left, and the cushion collar 30 that floats swings towards the tank bottom direction of keeping away from the mounting groove gradually, and the oil pressure in no pole chamber 144 increases in the twinkling of an eye, and fluid is through leading to oil groove 322 and piston rod end face 242 contact for the lifting surface area of fluid reaches the biggest in the twinkling of an eye, makes piston rod assembly 20 stretch out from cylinder 14 fast like this, and then reaches the effect of quick reaction, in order to satisfy the quick reaction requirement of pendulum valve hydro-cylinder.

Specifically, as shown in fig. 2 and fig. 3, in the embodiment of the present invention, four oil through grooves 322 are provided on the step surface 32, and the four oil through grooves 322 are disposed along the circumferential interval of the floating buffer sleeve 30 and are all communicated with the connecting hole 12.

The number of oil through grooves 322 may be set according to actual conditions, and the number of oil through grooves 322 may be set to any number other than four. For example, the number of the oil through grooves 322 may be two or eight. The plurality of oil through grooves 322 may be uniformly provided on the step surface 32.

Specifically, as shown in fig. 2 and 3, in the embodiment of the present invention, the floating cushion sleeve 30 is provided with a through hole 34, the sealing boss 22 is disposed in the through hole 34, and the hole wall surface of the through hole is matched with the outer peripheral surface of the sealing boss 22.

In the above arrangement, since the wall surface of the through hole 34 is matched with the outer peripheral surface of the sealing boss 22, the wall surface of the through hole 34 is tightly attached to the outer peripheral surface of the sealing boss 22, thereby preventing oil from passing through the annular gap formed between the floating buffer sleeve 30 and the sealing boss 22, and further ensuring that the piston rod assembly 20 can be normally retracted in the cylinder 14.

Specifically, as shown in fig. 1, in the embodiment of the present invention, an inner guiding conical surface 321 is disposed on one end of the sealing boss 22, an outer guiding conical surface 122 is disposed at the opening of the through hole 34, and the inner guiding conical surface 321 is matched with the outer guiding conical surface 122.

In the above arrangement, because the inner guiding conical surface 321 is matched with the outer guiding conical surface 122, the sealing boss 22 can be quickly guided into the through hole 34 of the floating buffer sleeve 30, so as to ensure that one end of the sealing boss 22 can quickly penetrate through the floating buffer sleeve 30, and further ensure that the piston rod assembly 20 can be slowly abutted against the cylinder seat 16, so as to avoid the problem that the swing valve cylinder is damaged due to large impact on the cylinder seat 16 caused by the piston rod assembly 20, and further ensure that the swing valve cylinder can normally work.

Specifically, as shown in fig. 1, in the embodiment of the present invention, the piston rod assembly 20 further includes a piston rod 24, the piston rod 24 has a piston rod end surface 242, and the sealing boss 22 is disposed on the piston rod end surface 242.

In the above arrangement, the piston rod end surface 242 has a limiting function for limiting the rightward movement position of the piston rod assembly 20, so as to ensure that the piston rod assembly 20 can be retracted to a preset position. In addition, when the piston rod assembly 20 extends out, the piston rod end surface 242 serves as a stress surface of oil, so that the oil can apply enough pressure to the piston rod assembly 20, the piston rod assembly 20 extends out quickly, and the quick response requirement of the swing valve oil cylinder is further met.

Specifically, as shown in fig. 1, in the embodiment of the present invention, the piston rod 24 and the sealing boss 22 are provided as an integrally formed structure.

In the above arrangement, the piston rod 24 and the sealing boss 22 are integrally formed, which facilitates manufacture, thereby reducing the manufacturing cost of the swing valve cylinder. Meanwhile, the connection strength of the piston rod 24 and the sealing boss 22 can be enhanced, so that the connection strength requirement of the piston rod assembly 20 is met.

It should be noted that, according to practical situations, the piston rod 24 and the sealing boss 22 may be provided in a split structure, that is, the sealing boss 22 and the piston rod 24 are detachably connected, for example, the sealing boss 22 is screwed on the piston rod 24. To facilitate subsequent replacement of the sealing boss 22.

Specifically, as shown in fig. 1, in the embodiment of the present invention, the swing valve cylinder is provided with an oil inlet 50, and the oil inlet 50 is communicated with the connecting hole 12.

In the above arrangement, oil may enter the rodless chamber 144 through the oil inlet 50, thereby ensuring that oil is in contact with the piston rod end surface 242 and, in turn, ensuring that the piston rod assembly 20 extends from the cylinder block 16.

Specifically, as shown in fig. 1, in an embodiment of the present invention, the cylinder body 10 includes a cylinder 14 and a cylinder base 16 connected to the cylinder 14, and the connection hole 12 is disposed on the cylinder base 16.

In the arrangement, the cylinder body 10 is arranged into a split structure, so that the parts in the swing valve oil cylinder can be conveniently mounted and dismounted, and the mounting and dismounting efficiency of the swing valve oil cylinder and the use convenience of the swing valve oil cylinder are further improved.

Specifically, as shown in fig. 1, in the embodiment of the present invention, the swing valve cylinder further includes a sealing member 60, and the sealing member 60 is disposed at a connection portion of the cylinder tube 14 and the cylinder seat 16.

In the above arrangement, the sealing element 60 can prevent the oil from leaking from the joint between the cylinder 14 and the cylinder seat 16, which causes waste of the oil and pollution to the environment, thereby saving the use cost of the swing valve oil cylinder and meeting the requirement of environmental protection.

Specifically, as shown in fig. 1, in the embodiment of the present invention, the limiting member 40 is a retaining ring, a fixing groove is provided on a groove wall of the mounting groove, and the retaining ring is partially fixed in the fixing groove.

In the above arrangement, the retainer ring has a limiting function, and the floating buffer sleeve 30 can be prevented from being separated from the mounting groove under the action of oil impact force, so that the floating buffer sleeve 30 can only swing in the accommodating space formed by the limiting part 40 and the mounting groove, and further the piston rod assembly 20 can be slowly abutted against the cylinder base 16, the problem that the swing valve cylinder is damaged due to large impact on the cylinder base 16 caused by the piston rod assembly 20 is avoided, and the swing valve cylinder can normally work.

The working principle of the pendulum valve oil cylinder in the application is explained as follows:

1. when oil is drawn into rod cavity 142, piston rod assembly 20 moves to the right, i.e., piston rod assembly 20 retracts. When oil is drawn into rodless chamber 144, piston rod assembly 20 moves to the left, i.e., piston rod assembly 20 extends.

2. When oil is fed into the rod cavity 142, the piston rod assembly 20 moves rightwards, the sealing boss 22 gradually approaches and partially penetrates through the floating buffer sleeve 30, the oil return section of the rodless cavity 144 becomes small, the oil return resistance becomes large, and a buffer effect is formed (the buffer distance is the length of the sealing boss 22). Wherein, the sealing boss 22 moves rightwards along with the piston rod assembly 20, and will exert impact force on the floating buffer sleeve 30, so that the floating buffer sleeve 30 is gradually close to the groove bottom surface of the mounting groove, the smaller the oil return section is, the larger the oil return resistance is, and the better the buffer effect is.

3. When no pole chamber 144 oil feed, piston rod assembly 20 moves left, and the groove bottom surface of mounting groove is kept away from gradually to floating cushion collar 30, and the oil pressure in no pole chamber 144 increases in the twinkling of an eye, and fluid passes through logical oil groove 322 contact piston rod terminal surface 242 for the lifting surface area of fluid reaches the biggest in the twinkling of an eye, and piston rod assembly 20 stretches out fast, reaches the effect of quick reaction.

The swing valve oil cylinder in the application has the following advantages:

1. the buffer performance is good, and the quick response performance is good;

2. the structure is simple and compact, the assembly is easy, and the cost is low;

3. the cylinder base 16 is provided with a mounting groove, a floating buffer sleeve 30 is arranged in the mounting groove, and a retainer ring is designed to limit the floating buffer sleeve 30 to be separated from the mounting groove;

4. the piston rod assembly 20 is designed with an extended end, and the circumferential side of the extended end is designed with a small-slope chamfer (forming an inner guiding conical surface 321) which enables the extended end to quickly penetrate through the floating cushion collar 30.

From the above description, it can be seen that, when oil enters the rod cavity 142, the piston rod assembly 20 moves rightwards, the sealing boss 22 gradually approaches and penetrates through the floating buffer sleeve 30, so that the oil return section of the rod-free cavity 144 becomes smaller, the oil return resistance becomes larger, and the buffering effect is achieved on the piston rod assembly 20. The sealing boss 22 moves rightwards along with the piston rod assembly 20, and impacts can be caused to the floating buffer sleeve 30, so that the floating buffer sleeve 30 swings towards the groove bottom surface of the installation groove and is gradually close to the groove bottom surface of the installation groove, the oil return section of the rodless cavity 144 becomes smaller, the oil return resistance becomes larger, the buffering effect on the piston rod assembly 20 is better, the piston rod assembly 20 is enabled to be slowly abutted against the cylinder seat 16, the problem that the swing valve oil cylinder is damaged due to the fact that the piston rod assembly 20 causes large impact on the cylinder seat 16 is avoided, and the swing valve oil cylinder is enabled to work normally.

In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a pendulum valve hydro-cylinder which characterized in that, pendulum valve hydro-cylinder includes:

a cylinder body (10) provided with a connecting hole (12);

a piston rod assembly (20) including a sealing boss (22), the piston rod assembly (20) being partially disposed within the cylinder (10), the piston rod assembly (20) being telescopically movable within the cylinder (10);

the swing valve oil cylinder further comprises a floating buffer sleeve (30) and a limiting piece (40), a mounting groove is formed in the hole wall of the connecting hole (12), the limiting piece (40) is fixed to the groove wall of the mounting groove, the floating buffer sleeve (30) is arranged on the periphery of the sealing boss (22), part of the floating buffer sleeve is located in a containing space formed by the limiting piece (40) and the mounting groove, and the floating buffer sleeve (30) can swing in the containing space.

2. The swing valve oil cylinder according to claim 1, characterized in that the floating buffer sleeve (30) is provided with a step surface (32), the step surface (32) is provided with a plurality of oil through grooves (322), and the plurality of oil through grooves (322) are arranged at intervals along the circumferential direction of the floating buffer sleeve (30) and are communicated with the connecting hole (12).

3. The swing valve oil cylinder according to claim 1, wherein the floating buffer sleeve (30) is provided with a through hole (34), the sealing boss (22) is arranged in the through hole (34), and the wall surface of the through hole is matched with the outer peripheral surface of the sealing boss (22).

4. The swing valve oil cylinder according to claim 3, wherein one end of the sealing boss (22) is provided with an inner guiding conical surface (321), the opening of the through hole (34) is provided with an outer guiding conical surface (122), and the inner guiding conical surface (321) is matched with the outer guiding conical surface (122).

5. The swing valve cylinder according to any one of claims 1 to 4, wherein the piston rod assembly (20) further comprises a piston rod (24), the piston rod (24) having a piston rod end face (242), the sealing boss (22) being provided on the piston rod end face (242).

6. The swing valve cylinder according to claim 5, wherein the piston rod (24) and the sealing boss (22) are provided in an integrally formed structure.

7. The swing valve cylinder according to any one of claims 1 to 4, wherein the swing valve cylinder is provided with an oil inlet (50), the oil inlet (50) communicating with the connection hole (12).

8. The swing valve cylinder according to any one of claims 1 to 4, wherein the cylinder body (10) comprises a cylinder barrel (14) and a cylinder base (16) connected with the cylinder barrel (14), and the connecting hole (12) is arranged on the cylinder base (16).

9. The swing valve cylinder according to claim 8, further comprising a seal (60), wherein the seal (60) is disposed at a junction of the cylinder tube (14) and the cylinder base (16).

10. The swing valve cylinder according to any one of claims 1 to 4, wherein the limiting member (40) is a retaining ring, a fixing groove is formed in the groove wall of the mounting groove, and the retaining ring is partially fixed in the fixing groove.