Anti-rotation hydraulic oil cylinder

Abstract

The utility model relates to the technical field of hydraulic oil cylinders, in particular to an anti-rotation hydraulic oil cylinder which comprises a cylinder barrel, oil inlets are formed in the two ends of the cylinder barrel, a piston rod and a piston are slidably installed in the cylinder barrel, the piston is fixedly installed at the end, located in the cylinder barrel, of the piston rod, and a limiting hole penetrating through the piston is formed in the piston rod. The limiting hole is formed in the piston rod and penetrates through the piston, the limiting hole is a spline hole, a limiting shaft is installed at the bottom of the cylinder barrel and slidably installed in the limiting hole, a first oil discharge hole is formed in the limiting shaft along the axis, and a second oil discharge hole is formed in the end, close to the bottom of the cylinder barrel, of the limiting shaft in a penetrating mode in the radial direction. By arranging the limiting hole and the limiting shaft, when the piston rod moves, circumferential rotation is limited by the limiting shaft and cannot rotate, so that the piston rod is fixed in the rotation direction, and the trouble of adding an anti-rotation device in a use scene of limiting rotation of the piston rod is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic oil cylinders, and in particular to a rotation-preventing hydraulic oil cylinder. BACKGROUND

[0002] A hydraulic oil cylinder is a common driving element in engineering machinery. A common hydraulic oil cylinder mainly comprises a cylinder barrel, a piston rod, a piston, and corresponding sealing structures. The cylinder barrel is provided with an oil inlet at both ends, and driving force is provided by controlling the oil inlet to push the piston to move.

[0003] However, since the cylinder barrel, the piston rod, and the piston are all cylindrical, the rotation of the piston rod is not limited in the process of use. In some use scenarios where the rotation of the piston rod needs to be limited, an anti-rotation device needs to be added, which is relatively troublesome. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application aims to provide a rotation-preventing hydraulic oil cylinder.

[0005] The above application purpose of the present application is achieved by the following technical scheme:

[0006] A rotation-preventing hydraulic oil cylinder comprises:

[0007] a cylinder barrel, the cylinder barrel being provided with an oil inlet at both ends;

[0008] a piston rod, the piston rod being slidably installed in the cylinder barrel;

[0009] a piston, the piston being fixedly installed at one end of the piston rod in the cylinder barrel;

[0010] a limiting hole, the limiting hole being formed in the piston rod and penetrating through the piston, the limiting hole being a spline hole;

[0011] a limiting shaft, the limiting shaft being installed at the bottom of the cylinder barrel, the limiting shaft being slidably installed in the limiting hole;

[0012] a first oil discharge hole, the first oil discharge hole being formed in the limiting shaft along an axis;

[0013] a second oil discharge hole, the second oil discharge hole being formed at one end of the limiting shaft close to the bottom of the cylinder barrel, the second oil discharge hole penetrating through the limiting shaft along the radial direction of the limiting shaft.

[0014] Optionally, the outer diameter of the limiting hole is greater than the outer diameter of the limiting shaft.

[0015] Optionally, the upper end of the limiting shaft is a hemispherical end, and the upper end of the limiting hole is a flat end.

[0016] Optionally, the limiting shaft is rotatably installed in the cylinder barrel, a switching plug rod is threadedly connected to the bottom of the cylinder barrel, the bottom of the limiting shaft is provided with a switching hole, and the switching plug rod penetrates the bottom of the cylinder barrel and is inserted into the switching hole.

[0017] Optionally, the two ends of the switching plug rod are fixedly provided with sealing plates, the sealing plates are provided with sealing pads, and the bottom of the limiting shaft is provided with a rotating ring groove.

[0018] Optionally, a sealing tube is fixedly installed at one end of the switching hole in the cylinder barrel, and the sealing tube is provided with a sealing ring.

[0019] Optionally, a hexagonal groove is formed at one end of the switching plug rod outside the cylinder barrel.

[0020] In summary, the present application has at least one of the following beneficial technical effects:

[0021] By arranging the limiting hole and the limiting shaft, when the piston rod moves, the circumferential rotation is limited by the limiting shaft and cannot rotate, so that the piston rod is fixed in the rotation direction, and the trouble of increasing the anti-rotation device in the use scene of limiting the rotation of the piston rod is reduced.

[0022] By arranging the switching plug rod, the limiting shaft can be switched between the rotating state and the fixed state at the bottom of the cylinder barrel, so that the piston rod can be switched between two states, and the use scene of limiting the rotation of the piston rod or requiring the rotation of the piston rod is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application;

[0024] Figure 2 is an enlarged schematic diagram of part A in Figure 1

[0025] Reference signs: 11, cylinder barrel; 111, oil inlet; 12, piston rod; 13, piston; 2, limiting hole; 31, limiting shaft; 32, first oil discharge hole; 33, second oil discharge hole; 41, switching plug rod; 42, switching hole; 411, sealing plate; 412, rotating ring groove; 43, sealing tube. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below with reference to the accompanying drawings.

[0027] Please refer to Figure 1 ​The application discloses a kind of anti-rotation hydraulic cylinder for the embodiment disclosed in the application, including cylinder barrel 11, cylinder barrel 11 both ends are provided with oil inlet 111, cylinder barrel 11 inside slidably installed with piston rod 12 and piston 13, piston 13 is fixedly installed in the one end of piston rod 12 in cylinder barrel 11, piston rod 12 is opened with limit hole 2 that passes through piston 13, limit hole 2 is opened in piston rod 12 and passes through piston 13, limit hole 2 is spline hole, cylinder barrel 11 bottom is installed with limit shaft 31, limit shaft 31 is slidably installed in limit hole 2, limit shaft 31 is opened with first oil discharge hole 32 along the axis in, limit shaft 31 is opened with second oil discharge hole 33 along the radial near the one end of cylinder barrel 11 bottom.

[0028] Specifically, by setting limit hole 2 and limit shaft 31, when piston rod 12 moves, circumferential rotation is limited by limit shaft 31 and cannot rotate, so that piston rod 12 is fixed in the rotation direction, and the trouble of increasing anti-rotation device in the use scene of limiting the rotation of piston rod 12 is reduced.

[0029] In some feasible ways, cylinder barrel 11, oil inlet 111, piston rod 12 and piston 13 are all prior art, which will not be described here. Limit shaft 31 can be fixed on the end of cylinder barrel 11 by welding, and a detachable hydraulic cylinder structure is selected for the convenience of installing cylinder barrel 11, limit shaft 31 is a spline shaft, first oil discharge hole 32 passes through the upper end of limit shaft 31 and communicates with second oil discharge hole 33, so that limit hole 2 is in space communication with cylinder barrel 11, and the negative pressure state in limit hole 2 is avoided when piston rod 12 slides, so as to affect the use of the hydraulic cylinder.

[0030] To further make limit hole 2 and cylinder barrel 11 in space communication, the outer diameter of limit hole 2 is greater than the outer diameter of limit shaft 31, so that hydraulic oil can enter and discharge limit hole 2 along the spline gap, and the upper end of limit shaft 31 is provided as a hemispherical end and the upper end of limit hole 2 is provided as a flat end, so as to avoid the contact between the upper end of limit hole 2 and the upper end of limit shaft 31 under a large external force, and the possibility of not being easy to separate.

[0031] As a specific embodiment of the anti-rotation hydraulic cylinder provided in the application, please refer to Figure 1 and Figure 2 Limit shaft 31 is rotatably installed in cylinder barrel 11, cylinder barrel 11 bottom is threadedly connected with switch plug rod 41, limit shaft 31 bottom is provided with switch hole 42, switch plug rod 41 penetrates cylinder barrel 11 bottom and is inserted into switch hole 42.

[0032] Overall, by providing Switch plug rod 41 makes limit shaft 31 can switch rotation or fixed state in cylinder barrel 11 bottom, so that piston rod 12 can switch two states, and it is convenient to use in the use scene of needing to limit the rotation of piston rod 12 or needing the rotation of piston rod 12.

[0033] Further, the switching plug rod 41 is fixedly installed with a sealing plate 411 at both ends, the sealing plate 411 is provided with a sealing gasket, and the bottom of the limiting shaft 31 is provided with a rotating ring groove 412.

[0034] It should be understood that, by setting the sealing plate 411 at both ends of the switching plug rod 41, the sealing plate 411 contacts the bottom of the cylinder barrel 11 to form a seal when the switching plug rod 41 switches states.

[0035] Further, the switching hole 42 is fixedly installed with a sealing pipe 43 at one end inside the cylinder barrel 11, and the sealing pipe 43 is provided with a sealing ring.

[0036] It should be understood that, by setting the sealing pipe 43, a sliding seal is formed between the switching plug rod 41, further improving the sealing of the position of the switching plug rod 41.

[0037] In some feasible manners, the bottom of the cylinder barrel 11 is fixedly installed with a fixed ring, the fixed ring is fixedly installed with a bearing, the bottom of the limiting shaft 31 is fixedly installed with a mounting disc, the mounting disc is fixedly installed in the inner ring of the bearing, the above-mentioned fixed installation can be achieved by welding or interference fit embedding, the rotating ring groove 412 is opened at the bottom of the mounting disc, the switching hole 42 is opened at the bottom of the rotating ring groove 412, the sealing plate 411 makes the switching plug rod 41 as a whole in the shape of a Chinese character Tu, two sealing plates 411 respectively form a seal at both ends of the bottom of the cylinder barrel 11 in two states, the sealing pipe 43 is fixedly installed inside the bottom of the cylinder barrel 11, the switching plug rod 41 is provided with a polished rod section near one end of the sealing pipe 43, and is installed with a sealing ring, so that the cylinder barrel 11 is in a sealed state during the sliding process of the switching plug rod 41.

[0038] In some feasible manners, in order to facilitate the adjustment of the switching plug rod 41, a hexagonal groove is opened at one end of the switching plug rod 41 outside the cylinder barrel 11.

[0039] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An anti-rotation hydraulic cylinder, characterized in that, include: Cylinder (11), with oil inlets (111) at both ends; Piston rod (12), which is slidably mounted on the cylinder (11); Piston (13), the piston (13) is fixedly installed at one end of the piston rod (12) located inside the cylinder (11); Limiting hole (2), the limiting hole (2) is opened in the piston rod (12) and passes through the piston (13), the limiting hole (2) is a spline hole; A limiting shaft (31) is installed at the bottom of the cylinder (11) and is slidably installed in the limiting hole (2). The first oil drain hole (32) is opened along the axis on the limiting shaft (31); The second oil drain hole (33) is located at one end of the limiting shaft (31) near the bottom of the cylinder (11), and the second oil drain hole (33) extends radially through the limiting shaft (31).

2. The anti-rotation hydraulic cylinder according to claim 1, characterized in that: The outer diameter of the limiting hole (2) is larger than the outer diameter of the limiting shaft (31).

3. The anti-rotation hydraulic cylinder according to claim 2, characterized in that: The upper end of the limiting shaft (31) is a hemispherical end, and the upper end of the limiting hole (2) is a planar end.

4. The anti-rotation hydraulic cylinder according to claim 1, characterized in that: The limiting shaft (31) is rotatably mounted on the cylinder (11). A switching plug rod (41) is threadedly connected to the bottom of the cylinder (11). A switching hole (42) is provided at the bottom of the limiting shaft (31). The switching plug rod (41) passes through the bottom of the cylinder (11) and is inserted into the switching hole (42).

5. The anti-rotation hydraulic cylinder according to claim 4, characterized in that: Both ends of the switching plug (41) are fixedly installed with sealing plates (411), the sealing plates (411) are provided with sealing gaskets, and the bottom of the limiting shaft (31) is provided with a rotating annular groove (412).

6. The anti-rotation hydraulic cylinder according to claim 5, characterized in that: The switching hole (42) is fixedly installed with a sealing tube (43) at one end inside the cylinder (11), and a sealing ring is provided inside the sealing tube (43).

7. The anti-rotation hydraulic cylinder according to claim 5, characterized in that: The switching rod (41) has a hexagonal groove at one end located outside the cylinder (11).

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