CN211202474U

CN211202474U - Hydraulic oil cylinder

Info

Publication number: CN211202474U
Application number: CN201921248591.9U
Authority: CN
Inventors: 赵幼兰
Original assignee: Zelida Hydraulic Machinery Kunshan Co ltd
Current assignee: Zelida Hydraulic Machinery Kunshan Co ltd
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-08-07
Anticipated expiration: 2029-08-02

Abstract

The utility model discloses a hydraulic cylinder, it includes: the piston rod comprises a cylinder barrel, an end cover, a guide sleeve, a piston rod and a sleeve, wherein the sleeve is sleeved on the piston rod, and a first end of the sleeve is abutted to the piston, so that when the piston moves towards the end cover, a second end, opposite to the first end, of the sleeve can be abutted to the guide sleeve, and the maximum stroke of the piston rod is limited; wherein the hydraulic cylinder further comprises a locking mechanism for preventing the sleeve from sliding on the piston rod. The utility model provides a hydraulic cylinder, its sleeve can shorten long dimension hydraulic cylinder's the actual maximum stroke to, select this telescopic length as required, can adjust this actual maximum stroke again. The locking mechanism can prevent the sleeve from moving on the piston rod when the hydraulic oil cylinder works, and further the sleeve is prevented from scratching the piston rod.

Description

Hydraulic oil cylinder

Technical Field

The utility model relates to a hydraulic pressure field, specificly is a hydraulic cylinder.

Background

The long hydraulic oil cylinder is mainly applied to special engineering machinery, and can enable the operation height and distance of the engineering machinery to be longer. Generally, the length of the piston rod determines the stroke of the piston rod, i.e. the length of the piston rod minus the length of its assembly with the piston, the height of the cylinder port guide sleeve, the end cap and the external flange, i.e. the stroke of the hydraulic cylinder. However, in many working occasions, the size of the longer hydraulic cylinder is only to match the length of the mechanism such as a mechanical arm, and the piston rod does not need to be extended by a large stroke according to the actual length of the mechanism in practical use, so that the extended length of the piston rod needs to be controlled by oil circuit distribution to shorten the maximum stroke of the piston rod. In other words, the process is generally controlled by operators, and the actual required maximum stroke is limited by a non-reliable mechanical mechanism, so that accidents are easy to happen.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the embodiment of the utility model provides a hydraulic cylinder, its actual maximum stroke that can shorten long-size hydraulic cylinder.

The embodiment of the application discloses: a hydraulic cylinder, comprising:

a cylinder barrel;

the end cover is fixedly connected to the opening end of the cylinder barrel so as to seal the cylinder barrel;

the guide sleeve is arranged on one side, facing the inside of the cylinder barrel, of the end cover;

the piston is arranged in the inner cavity of the cylinder barrel and can reciprocate along the axial direction of the cylinder barrel so as to divide the inner cavity of the cylinder barrel into two independent parts;

one end of the piston rod penetrates through the inner cavity of the cylinder barrel through the end cover and the guide sleeve and is fixedly connected with the piston; and

the sleeve is sleeved on the piston rod, a first end of the sleeve is abutted to the piston, so that when the piston moves towards the end cover, a second end, opposite to the first end, of the sleeve can be abutted to the guide sleeve to limit the maximum stroke of the piston rod;

wherein the hydraulic cylinder further comprises a locking mechanism for preventing the sleeve from sliding on the piston rod.

Further, the locking mechanism includes:

the piston rod is close to a first groove which is concavely arranged on the outer wall of the piston in the circumferential direction;

the inner wall of the sleeve is circumferentially provided with a second groove which is concave and corresponds to the first groove; and at least part of the clamping ring is accommodated in the first groove.

Furthermore, locking mechanical system include the recessed third groove of establishing of inner wall circumference of sleeve, and set up in the O type circle in the third groove, the third groove with between the O type circle, and between the O type circle and the outer wall of piston is interference fit.

Further, the first groove extends to the end face of the piston rod, which is connected with the piston.

Further, the piston rod is detachably connected with the piston.

Furthermore, the clamping ring is an elastic clamping ring.

Further, the number of the locking mechanisms is multiple.

Furthermore, a slope angle is formed between the outer wall of the piston rod, which is close to the piston, and the end face of the piston rod, which is connected with the piston.

The utility model has the advantages as follows:

1. the utility model provides a hydraulic cylinder, its sleeve can shorten long dimension hydraulic cylinder's the actual maximum stroke to, select this telescopic length as required, can adjust this actual maximum stroke again.

2. The locking mechanism can prevent the sleeve from moving on the piston rod when the hydraulic oil cylinder works, and further the sleeve is prevented from scratching the piston rod.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a hydraulic cylinder in an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 3 is a schematic structural diagram of another hydraulic cylinder in the embodiment of the present invention;

FIG. 4 is an enlarged schematic view of the structure at B in FIG. 3;

reference numerals of the above figures:

10. a guide sleeve; 20. a piston; 30. a piston rod; 40. a sleeve;

1. a first groove; 2. a second groove; 3. a snap ring; 4. a third groove; 5. and an O-shaped ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 or 3, a hydraulic cylinder includes:

a cylinder (not shown in the figure);

an end cap (not shown) attached to the open end of the cylinder to seal the cylinder;

the guide sleeve 10 is arranged on one side, facing the inside of the cylinder barrel, of the end cover;

the piston 20 is arranged in the inner cavity of the cylinder barrel and can reciprocate along the axial direction of the cylinder barrel so as to divide the inner cavity of the cylinder barrel into two independent parts;

one end of the piston rod 30 penetrates through the inner cavity of the cylinder barrel through the end cover and the guide sleeve 10 and is fixedly connected with the piston 20; and

a sleeve 40, sleeved on the piston rod 30, wherein a first end of the sleeve 40 abuts against the piston 20, so that when the piston 20 moves towards the end cover to drive the piston rod to extend out of the end cover, a second end of the sleeve 40 opposite to the first end can abut against the guide sleeve 10 before the piston 20 abuts against the guide sleeve 10, so that the piston 20 indirectly abuts against the guide sleeve 10 through the sleeve 40, and the maximum stroke of the piston rod 30 is further limited;

wherein the hydraulic ram further comprises a locking mechanism for preventing the sleeve 40 from sliding on the piston rod 30.

With the above structure, the actual maximum stroke of the piston rod 30 of the hydraulic cylinder can be adjusted by the length of the sleeve 40 fitted on the piston rod 30, and specifically, the maximum stroke should be the length of the piston rod 30 minus the length of the sleeve 40, the length of the guide sleeve 10, the end cover and the length of the sleeve 20, which are fitted on the piston 20, without considering other components (such as an external flange) fitted on the hydraulic cylinder. Therefore, the sleeve 40 can shorten the actual maximum stroke of the long hydraulic cylinder. Also, the length of the sleeve 40 is selected as desired, and the actual maximum stroke is adjusted. In addition, the locking mechanism can prevent the sleeve 40 from moving on the piston rod 30 when the hydraulic oil cylinder works, and therefore the sleeve 40 is prevented from scratching the piston rod 30.

Specifically, the cylinder barrel may be a barrel, the open end is located at one axial end of the cylinder barrel, and the end opposite to the open end is a cylinder bottom. And oil holes, corresponding pipelines and the like used for providing hydraulic oil for the inner cavity of the cylinder barrel can be arranged at two ends of the outer wall of the cylinder barrel. The piston rod 30 may be detachably connected with the piston 20, etc.

Referring to fig. 1 and 2, in an alternative embodiment, the locking mechanism includes a first groove 1 circumferentially recessed in the piston rod 30 near the outer wall of the piston 20; the inner wall of the sleeve 40 is provided with a second groove 2 which is circumferentially concave and corresponds to the first groove 1; and the snap ring 3 is at least partially accommodated in the first groove 1 and at least partially accommodated in the first groove 1. In this embodiment, the snap ring 3 can reliably position the sleeve 40 over the piston rod 30, thereby ensuring that the sleeve 40 does not shift on the piston rod 30 during operation of the hydraulic cylinder, and further ensuring that the sleeve 40 does not scratch the piston rod 30. Preferably, the snap ring 3 can be an elastic snap ring, so that the installation is convenient, the snap ring can continuously hold the second groove 2 tightly in the service process, and the play is not easy to occur; meanwhile, the elastic snap ring has long service life and is not easy to wear and break. More preferably, the first groove 1 may extend to an end surface where the piston rod 30 meets the piston 20. So that the snap ring 3 is smoothly fitted into the first groove 1 and, at the same time, the sleeve 40 can be very conveniently replaced after the piston 20 is removed from the piston rod 30.

Referring to fig. 3 and 4, in another alternative embodiment, the locking mechanism may include a third groove 4 recessed in the circumferential direction of the inner wall of the sleeve 40, and an O-ring 5 disposed in the third groove 4, where the interference fit is formed between the third groove 4 and the O-ring 5, and between the O-ring 5 and the outer wall of the piston 20. Specifically, the O-ring 5 may be a rubber seal ring or the like. Preferably, in this embodiment, the number of the locking mechanisms may be plural to enhance the fastening strength between the sleeve 40 and the piston rod 30. Preferably, a slope angle is formed between the outer wall of the piston rod 30 close to the piston 20 and the end surface of the piston rod 30 connected with the piston 20, so as to facilitate the installation of the O-ring 5.

The utility model discloses the principle and the implementation mode of the utility model are explained by applying the concrete embodiment, and the explanation of the above embodiment is only used for helping to understand the technical scheme and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A hydraulic cylinder, comprising:

a cylinder barrel;

2. The hydraulic ram of claim 1, wherein the locking mechanism comprises:

the inner wall of the sleeve is circumferentially provided with a second groove which is concave and corresponds to the first groove; and

at least part of the clamping ring is accommodated in the first groove, and at least part of the clamping ring is accommodated in the first groove.

3. The hydraulic oil cylinder as claimed in claim 1, wherein the locking mechanism comprises a third groove recessed circumferentially on the inner wall of the sleeve, and an O-ring disposed in the third groove, and the interference fit is provided between the third groove and the O-ring and between the O-ring and the outer wall of the piston.

4. The hydraulic ram of claim 2, wherein the first slot extends to an end face of the piston rod that interfaces with the piston.

5. A hydraulic ram according to claim 1 or 4, characterised in that the piston rod is detachably connected to the piston.

6. The hydraulic ram of claim 2, wherein the snap ring is a resilient snap ring.

7. A hydraulic ram according to claim 3, wherein the number of locking mechanisms is plural.

8. The hydraulic cylinder according to claim 3, characterized in that a slope angle is formed between the outer wall of the piston rod close to the piston and the end surface of the piston rod connected with the piston.