CN220378607U - Hydro-cylinder buffer gear and hydro-cylinder - Google Patents

Abstract

The utility model relates to an oil cylinder buffer mechanism and an oil cylinder, and belongs to the technical field of hydraulic pressure. The oil cylinder buffer mechanism comprises a cylinder barrel, a lock nut, a rodless cavity buffer ring, a piston, a rod cavity buffer ring, a piston rod, a guide sleeve and a one-way throttle valve; the rod cavity buffer ring is fixedly connected to one end of the piston rod through the piston, the rodless cavity buffer ring is fixedly connected to the other end of the piston rod through the lock nut and the piston, the guide sleeve is fixedly connected to the cylinder barrel through a screw, and the one-way throttle valve is arranged in a reserved valve hole at the bottom of the cylinder barrel; the oil cylinder comprises the oil cylinder buffer mechanism. The utility model can reduce the impact of the oil cylinder, prolong the service life of the oil cylinder, and can be started quickly, and has the advantages of simple structure, low requirement on assembly precision and low production cost.

Description

Hydro-cylinder buffer gear and hydro-cylinder

Technical Field

The utility model relates to the technical field of hydraulic pressure, in particular to an oil cylinder buffer mechanism and an oil cylinder.

Background

The hydraulic cylinder is used as an executive component of a hydraulic system, and has the characteristics of simple transmission structure, flexible action, capability of transmitting acting force and the like. Under the condition of higher operating speed of the oil cylinder, when the oil cylinder moves to the tail end of the stroke, the piston of the oil cylinder can directly collide with the guide sleeve or the cylinder bottom under the action of inertia to generate larger impact force, so that the service life of the oil cylinder can be reduced, and larger noise can be generated. The prior buffer oil cylinder is used for buffering the bottom side of the cylinder, and the piston rod extension section or the piston extension section is matched with the cylinder bottom to realize throttling buffer, or a floating buffer sleeve is arranged on the end surface of the cylinder bottom to realize buffer.

In the prior art, the buffer section is matched with the cylinder bottom by virtue of the piston rod or the piston extension section, if the fit clearance is smaller, the buffer section can not enter or enter difficultly under the condition that the processing precision of the piston rod or the piston and the assembly precision of the oil cylinder can not meet the requirement, the buffer section is blocked or abnormal sound occurs in the oil cylinder, even the oil cylinder can not run in full stroke, and if the fit clearance is increased, the buffer effect is greatly reduced, so that the prior art needs extremely high processing precision and assembly precision of the piston rod or the piston. The floating buffer ring is arranged on the cylinder bottom, so that the problem of matching is solved, but the floating buffer ring is only suitable for non-welded cylinder bottoms, and for welded cylinder bottoms, the floating buffer ring and the retainer ring are difficult to install because the cylinder bottom needs to be welded on the cylinder barrel.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, and provides an oil cylinder buffer mechanism and an oil cylinder, which can reduce oil flow when a piston rod extends and retracts to the end of a stroke, reduce the impact between a piston and a guide sleeve or a cylinder bottom, realize the buffer function of the oil cylinder, reduce noise and prolong the service life of the oil cylinder.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

in a first aspect, an oil cylinder buffer mechanism is provided, which comprises a cylinder barrel, a rodless cavity buffer ring, a piston, a rod cavity buffer ring, a piston rod and a guide sleeve;

the piston rod is arranged in the cylinder barrel, the piston is arranged outside the piston rod, the guide sleeve is arranged at the head part of the cylinder barrel, and the rodless cavity buffer ring and the rod cavity buffer ring are sleeved outside the piston rod and are respectively positioned at two sides of the piston;

when the piston rod extends to the end of the stroke, the rod cavity buffer ring is in radial clearance fit with the guide sleeve; and when the piston rod is retracted to the end of the stroke, the rodless cavity buffer ring is in radial clearance fit with the bottom of the cylinder barrel.

Further, the inner cavity of the cylinder barrel is divided into a rodless cavity and a rod cavity by the piston, and the cylinder barrel is provided with a rodless cavity oil port communicated with the rodless cavity and a rod cavity oil port communicated with the rod cavity.

Further, the cylinder is provided with a rodless cavity oil hole which is communicated with the rodless cavity oil hole and the rodless cavity, the bottom of the cylinder is provided with a valve hole, a one-way throttle valve is arranged in the valve hole, and the one-way throttle valve is used for realizing one-way conduction from the rodless cavity oil hole to the rodless cavity oil hole.

Further, the one-way throttle valve comprises a screw plug, a gasket, a spring and a valve body;

the screw plug is arranged in the valve hole, the gasket is connected below the screw plug, the valve body is embedded in the valve hole and can move along the valve hole, a spring pore canal is formed in the valve body, one end of the spring is arranged in the spring pore canal, and the other end of the spring is connected with the gasket;

when the piston rod is started from the fully contracted state, the spring is compressed, and the oil port of the rodless cavity is communicated with the oil hole of the rodless cavity.

Further, the one-way throttle valve further comprises a sealing O ring, a sealing ring groove is formed in the screw plug, and the sealing O ring is sleeved with the screw plug through the sealing ring groove.

Furthermore, radial clearance fit is adopted between the rodless cavity buffer ring and the piston rod as well as between the rod cavity buffer ring and the piston rod; the requirement on the assembly precision is reduced, and the requirement on the shape and position tolerance such as the straightness, the coaxiality and the like of the piston rod is also reduced.

Further, the outer surface of the piston rod is provided with an external thread, the piston is arranged on the piston rod through the external thread, a lock nut is arranged at the end part of the piston rod, which is positioned in the cylinder barrel, and the two axial ends of the buffer ring without the rod cavity are respectively propped against the piston and the lock nut.

Furthermore, the piston rod is provided with a plurality of steps, a buffer ring with a rod cavity is sleeved on the steps of the piston rod, and two axial ends of the buffer ring respectively prop against the piston and the steps of the piston rod.

Further, the guide sleeve is arranged on the cylinder barrel through a screw, a guide sleeve orifice and a communication hole are formed in the guide sleeve, and the rod cavity oil port, the communication hole, the guide sleeve orifice and the rod cavity are sequentially communicated.

Furthermore, the rodless cavity buffer ring and the rod cavity buffer ring are made of cast iron, so that the surface smoothness of the rod cavity buffer ring is improved, the problem of oil pollution caused by scrap iron generated in the oil cylinder due to mutual friction between the buffer ring and the buffer hole is avoided, and the sealing service life is prolonged.

In a second aspect, there is provided a cylinder comprising the cylinder buffer mechanism of any one of the first aspects.

Compared with the prior art, the utility model has the beneficial effects that:

(1) According to the utility model, the rodless cavity buffer ring and the rod cavity buffer ring are sleeved outside the piston rod and are respectively positioned at two sides of the piston, when the piston rod extends to the end of a stroke, the rod cavity buffer ring is in radial clearance fit with the guide sleeve, and when the piston rod retracts to the end of the stroke, the rodless cavity buffer ring is in radial clearance fit with the bottom of the cylinder barrel, so that the oil flow is reduced when the piston rod extends and retracts to the end of the stroke, the extending and retracting speed of the piston rod is reduced, and the oil cylinder buffer function is realized;

(2) According to the utility model, the guide sleeve is provided with the guide sleeve orifice, and the bottom of the cylinder barrel is provided with the one-way throttle valve, so that the oil flow is reduced when the piston rod extends and retracts to the end of the stroke, and the buffer function of the oil cylinder is realized;

(3) In the utility model, when the piston rod is started from the fully contracted state, oil enters from the rodless cavity oil port, the spring is compressed, the one-way throttle valve is in an open state, the rodless cavity oil port and the rodless cavity oil hole are in a communication state, and the oil can freely enter the rodless cavity through the rodless cavity oil hole to push the piston rod to extend; when the piston rod is started in a full-extension state, oil can enter the rod cavity from the guide sleeve orifice to push the piston rod to retract; the matching of the one-way throttle valve and the rodless cavity and the matching of the guide sleeve orifice and the rod cavity can realize the quick starting function of the piston rod in the fully contracted/fully extended state;

(4) The utility model can be applied to equipment which has larger flow of a hydraulic system, higher oil cylinder speed and can not be externally provided with a buffering and positioning sensor.

Drawings

Fig. 1 is a schematic diagram of an internal structure of an oil cylinder buffer mechanism according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of an internal structure of a one-way throttle valve according to an embodiment of the present utility model.

Description of the reference numerals: the hydraulic cylinder comprises a cylinder barrel 1, a locking nut 2, a rod-free cavity buffer ring 3, a piston 4, a rod-free cavity buffer ring 5, a piston rod 6, a guide sleeve 7, a one-way throttle valve 8, a screw plug 8-1, a sealing O-ring 8-2, a gasket 8-3, a spring 8-4, a valve body 8-5, a rod-free cavity oil port 9, a rod-free cavity oil hole 10, a guide sleeve orifice 11, a rod-free cavity 12, a rod-free cavity 13, a rod-free cavity oil port 14, a communication hole 15 and a valve hole 16.

Detailed Description

The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

Example 1

Referring to fig. 1 to 2, the present embodiment provides an oil cylinder buffer mechanism, which comprises a cylinder barrel 1, a rodless cavity buffer ring 3, a piston 4, a rod cavity buffer ring 5, a piston rod 6 and a guide sleeve 7; the piston rod 6 is arranged in the cylinder barrel 1, the piston 4 is arranged outside the piston rod 6, the guide sleeve 7 is arranged at the head of the cylinder barrel 1, and the rodless cavity buffer ring 3 and the rod cavity buffer ring 5 are sleeved outside the piston rod 6 and are respectively positioned at two sides of the piston 4; when the piston rod 6 extends to the end of the stroke, the rod cavity buffer ring 5 is in radial clearance fit with the guide sleeve 7; when the piston rod 6 is retracted to the end of the stroke, the rodless cavity buffer ring 3 is in radial clearance fit with the bottom of the cylinder barrel 1; the piston 4 divides the inner cavity of the cylinder barrel 1 into a rodless cavity 12 and a rod cavity 13, and the cylinder barrel 1 is provided with a rodless cavity oil port 9 communicated with the rodless cavity 12 and a rod cavity oil port 14 communicated with the rod cavity 13.

Specifically, the outer surface of the piston rod 6 is provided with external threads, the piston 4 is arranged on the piston rod 6 through the external threads, the lock nut 2 is arranged at the end part of the piston rod 6 positioned in the cylinder barrel 1, the two axial ends of the rodless cavity buffer ring 3 respectively prop against the piston 4 and the lock nut 2, and the axial limiting of the rodless cavity buffer ring 3 is realized. The piston rod 6 is provided with a plurality of steps, the buffer ring 5 with the rod cavity is sleeved on the steps of the piston rod 6, and the two axial ends respectively prop against the steps of the piston 4 and the piston rod 6, so that the axial limit of the buffer ring 5 with the rod cavity is realized.

Further, the cylinder barrel 1 is provided with a rodless cavity oil hole 10 which is communicated with the rodless cavity oil port 9 and the rodless cavity 12, the bottom of the cylinder barrel 1 is provided with a valve hole 16, a one-way throttle valve 8 is arranged in the valve hole 16, and the one-way throttle valve 8 is used for realizing one-way conduction from the rodless cavity oil port 9 to the rodless cavity oil hole 10. When the piston rod 6 extends to the end of the stroke, the outer circle of the buffer ring 5 with the rod cavity is in clearance fit with the inner hole of the guide sleeve 7, so that the oil flow area is reduced, the flow is reduced, the extending speed of the piston rod 6 is reduced, the impact force between the piston 4 and the guide sleeve 7 is reduced, and the buffer effect is realized; when the piston rod 6 is retracted to the end of the stroke, the excircle of the rodless cavity buffer ring 3 is in clearance fit with the inner hole of the cylinder bottom of the cylinder barrel 1, the oil flow area is reduced, the flow is reduced, the retraction speed of the piston rod 6 is reduced, the impact force between the piston 4 and the cylinder bottom of the cylinder barrel 1 is reduced, and the buffer effect is realized.

Still further, the one-way throttle valve 8 comprises a screw plug 8-1, a sealing O-ring 8-2, a gasket 8-3, a spring 8-4 and a valve body 8-5; the screw plug 8-1 is arranged in the valve hole 16, a sealing ring groove is formed in the screw plug 8-1, the sealing O-ring 8-2 is sleeved with the screw plug 8-1 through the sealing ring groove to play a role in sealing, the gasket 8-3 is connected below the screw plug 8-1 to play a role in interval protection, the valve body 8-5 is embedded in the valve hole 16 and can move along the valve hole 16, a spring pore canal is formed in the valve body 8-5, one end of the spring 8-4 is arranged in the spring pore canal, and the other end of the spring 8-4 is connected with the gasket 8-3; the guide sleeve 7 is arranged on the cylinder barrel 1 through a screw, the guide sleeve 7 is provided with a guide sleeve orifice 11 and a communication hole 15, and a rod cavity oil port 14, the communication hole 15, the guide sleeve orifice 11 and the rod cavity 13 are communicated in sequence. When the piston rod 6 starts from the fully contracted state, oil enters from the rodless cavity oil port 9, the oil pressure pushes the valve body 8-5 to overcome the elasticity of the spring 8-4 upwards, the spring 8-4 is compressed, the one-way throttle valve 8 is in an open state, the rodless cavity oil port 9 is communicated with the rodless cavity oil hole 10, and the oil can freely enter the rodless cavity 12 through the rodless cavity oil hole 10 to push the piston rod 6 to extend out so as to realize quick starting; when the piston rod 6 is started from the full extension state, oil enters the rod cavity 13 from the guide sleeve orifice 11 after passing through the rod cavity oil port 14 and the communication hole 15, and pushes the piston rod 6 to retract, so that the quick start when the piston rod 6 is retracted is realized.

Specifically, fit clearances exist in the diameter directions between the rodless cavity buffer ring 3 and the piston rod 6 and between the rod cavity buffer ring 5 and the piston rod 6, so that the rodless cavity buffer ring 3 and the rod cavity buffer ring 5 can float up and down after entering a buffer area, the rodless cavity buffer ring 3 and the inner cavity axle center of the cylinder barrel 1 and the inner cavity axle center of the rod cavity buffer ring 5 and the guide sleeve 7 are automatically aligned under the action of pressure, and the problems that the rodless cavity buffer ring 3 and the rod cavity buffer ring 5 are blocked in the cylinder barrel 1 and the guide sleeve 7 due to out-of-tolerance of form and position caused by machining and assembly errors are avoided, and further the problems of blocking, abnormal sound and the like of an oil cylinder are caused, so that the assembly difficulty of the oil cylinder is reduced.

Example 2

The present embodiment provides an oil cylinder, which includes the oil cylinder buffer mechanism described in embodiment 1.

When the buffer oil cylinder is used, the radial clearance is reserved between the buffer ring and the piston rod in the oil cylinder, so that the requirement on assembly precision is reduced, and the requirement on the form and position tolerance such as straightness and coaxiality of the piston rod is also reduced, so that the buffer oil cylinder is easier to produce and manufacture.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.

Claims (10)

1. The oil cylinder buffer mechanism is characterized by comprising a cylinder barrel (1), a rodless cavity buffer ring (3), a piston (4), a rod cavity buffer ring (5), a piston rod (6) and a guide sleeve (7);

the piston rod (6) is arranged in the cylinder barrel (1), the piston (4) is arranged outside the piston rod (6), the guide sleeve (7) is arranged at the head of the cylinder barrel (1), and the rodless cavity buffer ring (3) and the rod cavity buffer ring (5) are sleeved outside the piston rod (6) and are respectively positioned at two sides of the piston (4);

when the piston rod (6) extends to the end of the stroke, the rod cavity buffer ring (5) is in radial clearance fit with the guide sleeve (7); when the piston rod (6) is retracted to the end of the stroke, the rodless cavity buffer ring (3) is in radial clearance fit with the bottom of the cylinder barrel (1).

2. The cylinder buffer mechanism according to claim 1, wherein the piston (4) divides the inner cavity of the cylinder barrel (1) into a rodless cavity (12) and a rod cavity (13), and the cylinder barrel (1) is provided with a rodless cavity oil port (9) communicated with the rodless cavity (12) and a rod cavity oil port (14) communicated with the rod cavity (13).

3. The cylinder buffer mechanism according to claim 2, wherein the cylinder barrel (1) is provided with a rodless cavity oil hole (10) which is communicated with the rodless cavity oil hole (9) and the rodless cavity (12), a valve hole (16) is formed in the bottom of the cylinder barrel (1), a one-way throttle valve (8) is installed in the valve hole (16), and the one-way throttle valve (8) is used for realizing one-way conduction from the rodless cavity oil hole (9) to the rodless cavity oil hole (10).

4. A cylinder buffer mechanism according to claim 3, characterized in that the one-way throttle valve (8) comprises a plug screw (8-1), a gasket (8-3), a spring (8-4) and a valve body (8-5);

the screw plug (8-1) is arranged in the valve hole (16), the gasket (8-3) is connected below the screw plug (8-1), the valve body (8-5) is embedded in the valve hole (16) and can move along the valve hole (16), a spring pore canal is formed in the valve body (8-5), one end of the spring (8-4) is arranged in the spring pore canal, and the other end of the spring is connected with the gasket (8-3);

when the piston rod (6) is started from the fully contracted state, the spring (8-4) is compressed, and the rodless cavity oil port (9) is communicated with the rodless cavity oil hole (10).

5. The cylinder buffer mechanism according to claim 4, wherein the one-way throttle valve (8) further comprises a sealing O-ring (8-2), the screw plug (8-1) is provided with a sealing ring groove, and the sealing O-ring (8-2) is sleeved with the screw plug (8-1) through the sealing ring groove.

6. The cylinder buffer mechanism according to claim 1, characterized in that radial clearance fit is adopted between the rodless cavity buffer ring (3) and the piston rod (6) and between the rod cavity buffer ring (5) and the piston rod (6).

7. The cylinder buffering mechanism according to claim 1, wherein an external thread is arranged on the outer surface of the piston rod (6), the piston (4) is arranged on the piston rod (6) through the external thread, the locking nut (2) is arranged at the end part of the piston rod, which is positioned in the cylinder barrel, and the two axial ends of the rodless cavity buffering ring (3) are respectively propped against the piston (4) and the locking nut (2).

8. The cylinder buffer mechanism according to claim 1, wherein the piston rod (6) is provided with a plurality of steps, the buffer ring (5) with the rod cavity is sleeved on the steps of the piston rod (6), and two axial ends respectively prop against the piston (4) and the steps of the piston rod.

9. The cylinder buffer mechanism according to claim 2, wherein the guide sleeve (7) is mounted on the cylinder barrel (1) through a screw, the guide sleeve (7) is provided with a guide sleeve orifice (11) and a communication hole (15), and the rod cavity oil port (14), the communication hole (15), the guide sleeve orifice (11) and the rod cavity (13) are sequentially communicated.

10. A cylinder comprising the cylinder buffer mechanism according to any one of claims 1 to 9.