A piston rod anti-tilt device

Abstract

The present invention discloses a piston rod anti-tilt device, comprising a cylinder barrel and a piston rod. A seal is installed in the inner circular hole of the cylinder head for sealing the gap between the piston rod and the inner circular hole of the cylinder head. The device is also provided with a circular sleeve-shaped anti-drift fastening sleeve for limiting the radial position of the piston rod. The anti-drift fastening sleeve is fixedly sleeved on the cylinder barrel and seals the junction between the piston rod and the cylinder head. The piston rod axially moves through the inner circular hole of the anti-drift fastening sleeve and slides with the inner circular hole of the anti-drift fastening sleeve. The inner circular hole of the anti-drift fastening sleeve is provided with a wear-resistant inner lining layer that slides with the piston rod. Due to the provision of the anti-drift fastening sleeve, the piston rod can have a reliable radial force point, which can prevent oil leakage caused by seal failure.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, in particular to an anti-tilting device for a piston rod of a hydraulic cylinder. Background Art

[0002] During the use of the hydraulic cylinder, the cylinder is placed vertically and its piston rod moves in the vertical direction. When the piston rod is extended to the top and remains in a hovering state, since the end of the piston rod is supported by a heavy object, the piston rod will have the risk of horizontal deviation in its natural state. That is, the piston rod of the hydraulic cylinder will be subjected to a load perpendicular to the length of the rod when loaded, and such a pressure-maintaining hovering state may need to be maintained for 1-2 months, resulting in a significantly increased risk of horizontal deviation of the piston rod.

[0003] Once the piston rod produces the above-mentioned deviation phenomenon, the force point will be concentrated on the junction of the piston rod and the cylinder barrel, that is, the sealing component of the cylinder head. The sealing component will fail in a short time due to eccentric compression for a long time, causing oil leakage in the cylinder. Summary of the Invention

[0004] The purpose of the present invention is to provide a piston rod anti-tilt device, thereby solving the problems of "piston rod deviation in the horizontal direction" and "oil leakage" existing in the prior art.

[0005] The object of the present invention is achieved as follows: A piston rod anti-tilt device comprises a cylinder barrel and a piston rod, a sleeve-shaped cylinder cover is fixed to the axial end opening of the cylinder barrel, the piston rod axially movably passes through the inner circular hole of the cylinder cover, and a sealing member is installed in the inner circular hole of the cylinder cover for sealing the gap between the piston rod and the inner circular hole of the cylinder cover;

[0006] The device is also provided with a circular sleeve-shaped anti-deviation fastening sleeve for limiting the radial position of the piston rod. The anti-deviation fastening sleeve is fixedly sleeved on the cylinder barrel and seals the junction between the piston rod and the cylinder cover. The piston rod axially moves through the inner circular hole of the anti-deviation fastening sleeve and slides with the inner circular hole of the anti-deviation fastening sleeve.

[0007] The inner circular hole of the anti-deviating fastening sleeve is provided with a wear-resistant lining layer which is in sliding cooperation with the piston rod.

[0008] The beneficial effects of the present invention are:

[0009] 1. The anti-deviation fastening sleeve provides a reliable radial force point for the piston rod, significantly enhancing its radial load-bearing capacity. This prevents radial deviation of the piston rod and allows the piston rod and cylinder to maintain a relatively coaxial state.

[0010] 2. Since the anti-deviating fastening sleeve seals the junction between the piston rod and the cylinder head, it can prevent the oil leakage caused by the failure of the seal;

[0011] 3. The inner hole of the anti-drift fastening sleeve is provided with a wear-resistant lining layer that slides with the piston rod to ensure the wear resistance of the piston rod and the anti-drift fastening sleeve and the guidance of the piston rod's telescopic movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0013] Figure 2 It is a schematic cross-sectional structural diagram of the present invention. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1 、 2 As shown, a piston rod anti-tilt device includes a cylinder barrel 1 and a piston rod 2. A circular sleeve-shaped cylinder cover 3 is fixed at the axial end opening of the cylinder barrel 1. The piston rod 2 axially moves through the inner circular hole of the cylinder cover 3. The inner circular hole of the cylinder cover 3 is installed with a seal 4 for sealing the gap between the piston rod 2 and the inner circular hole of the cylinder cover 3.

[0016] The device is also provided with a circular sleeve-shaped anti-deviation fastening sleeve 5 for limiting the radial position of the piston rod 2. The anti-deviation fastening sleeve 5 is fixedly sleeved on the cylinder barrel 1 and seals the junction between the piston rod 2 and the cylinder cover 3. The piston rod 2 axially moves through the inner circular hole of the anti-deviation fastening sleeve 5 and slides with the inner circular hole of the anti-deviation fastening sleeve 5.

[0017] Due to the provision of the anti-deviation fastening sleeve 5, the piston rod 2 has a reliable radial force point, so that its radial load-bearing capacity is significantly enhanced; since the anti-deviation fastening sleeve 5 seals the junction between the piston rod 2 and the cylinder head 3, it can prevent oil leakage caused by failure of the seal 4.

[0018] In order to ensure the wear-resistant performance of the movable cooperation between the piston rod 2 and the anti-deviation fastening sleeve 5, and to ensure the guiding performance of the telescopic activity of the piston rod 2, the inner circular hole of the above-mentioned anti-deviation fastening sleeve 5 is provided with a wear-resistant lining layer 501 that slides with the piston rod 2. The wear-resistant lining layer 501 can be an inner lining layer made of PTFE material or a wear-resistant layer made of other materials.

[0019] In order to facilitate installation, the anti-deviating fastening sleeve 5 is divided into two semicircular structures in the radial direction, and the two semicircular structures are fixed and spliced ​​into one by screws.

[0020] In order to prevent extreme oil leakage (such as serious failure of the seal 4 causing leakage of hydraulic oil), the inner circular hole of the above-mentioned anti-deviation fastening sleeve 5 is coaxially provided with an annular oil drain groove 504 for accommodating the oil leaked from the cylinder 1, and the junction of the piston rod 2 and the cylinder head 3 is located in the oil drain groove 504; the anti-deviation fastening sleeve 5 is provided with an oil return hole 505 extending along its radial direction, one end of the oil return hole 505 is connected to the inner circular hole of the anti-deviation fastening sleeve 5, and the other end of the oil return hole 505 is connected to the oil tank 6 through an oil pipe to discharge the oil leaked from the cylinder 1 back to the oil tank 6.

[0021] When an extreme oil leakage occurs, the leaked hydraulic oil is large, and the leaked hydraulic oil can be discharged back to the oil tank 6 through the oil drain groove 504, the oil return hole 505, and the external oil pipe.

[0022] In order to enhance the sealing performance of the anti-deviation fastening sleeve 5 and further prevent the leakage of hydraulic oil, the inner hole of the anti-deviation fastening sleeve 5 is coaxially provided with an annular sealing groove, and an O-ring 7 is installed in the annular sealing groove. The O-ring 7 seals the gap between the inner hole of the anti-deviation fastening sleeve 5 and the outer peripheral wall of the cylinder head 3.

[0023] In order to facilitate locking the position of the anti-misalignment fastening sleeve 5, this embodiment proposes a preferred solution. The outer peripheral wall of the above-mentioned cylinder 1 is coaxially provided with an annular fastener limiting groove 1a. The device is also provided with a plurality of fastening screws 8. The threaded portion of the fastening screw 8 radially passes through the anti-misalignment fastening sleeve 5 and is threadedly connected to the anti-misalignment fastening sleeve 5. The threaded portion of the fastening screw 8 abuts against the inner wall of the fastener limiting groove 1a to lock the anti-misalignment fastening sleeve 5 on the cylinder 1.

[0024] In order to optimize the structural setting scheme, the above-mentioned anti-deviation fastening sleeve 5 is divided into a first part 502 and a second part 503 along the axial direction. The first part 502 and the second part 503 are connected as a whole and are both circular sleeve structures. The first part 502 and the second part 503 are coaxial.

[0025] The second portion 503 is movably engaged with the piston rod 2 .

[0026] The above-mentioned first part 502 is movably matched with the piston rod 2 and fixedly sleeved on the cylinder 1. The outer diameter of the first part 502 is larger than the outer diameter of the second part 503. The inner circular hole of the anti-deviation fastening sleeve 5 is set as a stepped hole. The inner hole diameter of the first part 502 is larger than the inner hole diameter of the second part 503, so that the cylinder head 3 can be axially limited by the stepped surface of the inner circular hole of the anti-deviation fastening sleeve 5. The stepped surface constitutes a part of the inner wall of the oil drain groove 504.

[0027] The above are preferred embodiments of the present invention. Those skilled in the art may make various changes or improvements based on the above. Without departing from the overall concept of the present invention, these changes or improvements should fall within the scope of protection required by the present invention.

Claims

1. A piston rod anti-tilt device, comprising a cylinder barrel (1) and a piston rod (2), wherein a sleeve-shaped cylinder cover (3) is fixed to the axial end opening of the cylinder barrel (1), the piston rod (2) axially movably passes through the inner circular hole of the cylinder cover (3), and the inner circular hole of the cylinder cover (3) is equipped with a sealing member (4) for sealing the gap between the piston rod (2) and the inner circular hole of the cylinder cover (3), characterized in that: The device is further provided with a circular sleeve-shaped anti-deviation fastening sleeve (5) for limiting the radial position of the piston rod (2); the anti-deviation fastening sleeve (5) is fixedly sleeved on the cylinder barrel (1) and seals the junction between the piston rod (2) and the cylinder cover (3); the piston rod (2) axially moves through the inner circular hole of the anti-deviation fastening sleeve (5) and is slidably engaged with the inner circular hole of the anti-deviation fastening sleeve (5); The inner circular hole of the anti-deviating fastening sleeve (5) is provided with a wear-resistant inner lining layer (501) that is in sliding engagement with the piston rod (2); The inner circular hole of the anti-deviating fastening sleeve (5) is coaxially provided with an annular oil drain groove (504) for accommodating oil leaked from the cylinder barrel (1), and the junction of the piston rod (2) and the cylinder cover (3) is located in the oil drain groove (504); The anti-deviation fastening sleeve (5) is provided with an oil return hole (505) extending in its radial direction, one end of the oil return hole (505) is communicated with the inner circular hole of the anti-deviation fastening sleeve (5), and the other end of the oil return hole (505) is connected to the oil tank (6) through an oil pipe to discharge the oil leaked from the cylinder (1) back to the oil tank (6); The anti-deviating fastening sleeve (5) is axially divided into a first portion (502) and a second portion (503), the first portion (502) and the second portion (503) are connected as a whole and both have a circular sleeve-shaped structure, and the first portion (502) and the second portion (503) are coaxial; The second portion (503) is movably engaged with the piston rod (2); The first part (502) is movably matched with the piston rod (2) and fixedly sleeved on the cylinder barrel (1); The outer diameter of the first portion (502) is greater than the outer diameter of the second portion (503).

2. The piston rod anti-tilt device according to claim 1, characterized in that: The anti-deviating fastening sleeve (5) is divided into two semicircular structures in the radial direction, and the two semicircular structures are fixed and spliced ​​into one body by screws.

3. The piston rod anti-tilt device according to claim 1, characterized in that: An annular sealing groove is coaxially provided on the inner circular hole of the anti-deviation fastening sleeve (5), and an O-ring (7) is installed in the annular sealing groove. The O-ring (7) seals the gap between the inner circular hole of the anti-deviation fastening sleeve (5) and the outer peripheral wall of the cylinder cover (3).

4. The piston rod anti-tilt device according to claim 1, characterized in that: An annular fastener limiting groove (1a) is coaxially provided on the outer peripheral wall of the cylinder (1). The device is also provided with a plurality of fastening screws (8). The threaded portion of the fastening screw (8) radially passes through the anti-deviating fastening sleeve (5) and is threadedly connected to the anti-deviating fastening sleeve (5). The threaded portion of the fastening screw (8) abuts against the inner wall of the fastener limiting groove (1a) to lock the anti-deviating fastening sleeve (5) on the cylinder (1).

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