JP3242215U - Piston rod seal structure, hydraulic cylinder and hydraulic hoist - Google Patents

Abstract

A piston rod seal structure, a hydraulic cylinder, and a hydraulic hoist are provided that do not cause leakage even if the axis of the piston rod is deviated and have a good sealing effect. A piston rod seal structure includes an end cap (1) having a hollow structure, a piston rod (2) passing through the end cap, and an outer wall provided between the end cap and the piston rod in rotational contact with the inner wall of the end cap. A rotating member 3 whose inner wall is in sliding contact with the outer wall of the piston rod and is suitable for being rotated by the gravitational drive of the piston rod, and a first sealing member 401 provided between the rotating member and the piston rod. and a sealing assembly. When sealing the piston rod of a conventional hydraulic cylinder with a V-ring, if the piston rod protrudes obliquely and the protruding length becomes longer, the V-ring seal failure and leakage of hydraulic oil occur. . [Selection drawing] Fig. 1

Description

The present invention relates to the technical field of hydraulic seals, specifically to piston rod seal structures, hydraulic cylinders and hydraulic hoists.

A water gate is a door installed in a flood control structure such as an overflow dam. By opening and closing the water gate, it is possible to adjust the flow and level of water in the vicinity and prevent flooding. Since the water gate has a large volume and requires a large operating force to open and close, a special mechanism is generally installed to control the operation of the water gate. A common mechanism is a hydraulic hoist that controls the hydraulic cylinders with a hydraulic system, drives the movement of the hydraulic cylinders with hydraulic pressure, and opens and closes the water gates with the hydraulic cylinders.

In conventional hydraulic hoists, when sealing the piston rod of the hydraulic cylinder, it is common to perform dynamic sealing with a V-ring. Since the water gate is generally inclined when closed, the piston rod often protrudes obliquely, and the piston rod is large and heavy. When the piston rod protrudes obliquely for a long time and the protruding length is long, a phenomenon occurs in which the axis of the piston rod does not overlap the axis of the body of the hydraulic cylinder due to the gravity of the piston rod. The ring compresses unevenly, causing dynamic seal failure and hydraulic fluid leakage.

Therefore, the technical problem to be solved by the present invention is that when the piston rod of the conventional hydraulic cylinder is sealed with a V-ring, the piston rod protrudes obliquely, and if the protruding length becomes longer, the V-ring may cause a sealing failure. To provide a piston rod seal structure, a hydraulic cylinder, and a hydraulic hoist which overcome the drawbacks of hydraulic oil leakage and prevent leakage even when the axis of a piston rod is deviated, and have excellent sealing.

In order to solve the above problems, the present invention
an end cap having a hollow structure;
a piston rod passing through the end cap;
provided between said end cap and said piston rod, an outer wall in rotational contact with said inner wall of said end cap, an inner wall in sliding contact with said outer wall of said piston rod, and a gravitational drive of said piston rod; a pivoting member adapted to be entrained by
A piston rod seal arrangement is provided, comprising: the pivot member; and a seal assembly having a first seal member disposed between the piston rod.

Optionally, the inner wall of said end cap is provided with a spherical groove and the outer wall of said pivot member is spherical and in pivotal contact with said spherical groove.

Optionally, one end of the rotating member is provided with a mounting groove in which the first sealing member is provided.

Optionally further comprising a ground fixedly connected to one end of said end cap.

Optionally, one end of said gland is inserted into said hollow structure and abuts one end of said first sealing member.

Optionally, the gland has a stepped end inserted into the hollow structure and an arcuate contact portion with the first sealing member.

Optionally, said first sealing member is a V-ring.

Optionally, said sealing assembly comprises a second sealing member provided between said pivot member and said end cap, and a third sealing member provided between said gland and said end cap. and further including

A hydraulic cylinder further comprising a body including the piston rod seal structure, fixedly connected to the end of the end cap remote from the gland, and coaxially mounted with the end cap. .

A hydraulic hoist including the above hydraulic cylinder.

The present invention has the following advantages.

1. In the piston rod seal structure provided by the present invention, the piston rod is provided in the hollow structure of the end cap, the pivot member is provided between the end cap and the piston rod, and the outer wall is in pivot contact with the inner wall of the end cap. The first sealing member is provided between the rotating member and the piston. When the piston rod extends obliquely, the axis of the piston rod deviates from the axis of the end cap due to the action of gravity, leading the rotating member to rotate. By doing so, it is possible to properly seal the first seal member without causing a sealing failure.

2. In the piston rod seal structure provided by the present invention, a second sealing member is provided between the pivot member and the end cap, a third sealing member is provided between the gland and the end cap, and a third sealing member is provided between the rotating member and the end cap. By providing the second seal member and the third seal member, it is possible to prevent hydraulic oil from leaking from the connecting portion between the rotating member and the end cap and from the connecting portion between the gland and the end cap, resulting in a good sealing effect. .

3. The hydraulic cylinder provided by the present invention uses the piston rod seal structure, and the body is connected to the end of the end cap remote from the gland to achieve the fixation of the piston rod seal structure. The piston rod of such a hydraulic cylinder protrudes obliquely, and by maintaining the oblique state for a long time, the sealing performance can be ensured without omission.

4. The hydraulic hoist provided by the present invention uses such a hydraulic hoist to operate the water gate. No leaks at all. The seals are effective, long-lived and not easily damaged.

In order to describe the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly describes the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. , The accompanying drawings in the following description are part of the embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on them without creative activities. Will.

FIG. 1 is a schematic diagram of a piston rod seal structure according to the present invention.

FIG. 2 is a partial enlarged view of A in FIG. 1 of the present invention.

The following clearly and completely describes the technical solutions of the present invention in conjunction with the drawings, but it is obvious that the above embodiments are only a part of the embodiments of the present invention, but not all of them. For those skilled in the art, other embodiments obtained without creative activities based on the embodiments of the present invention shall all fall within the protection scope of the present invention.

In the description of the present invention, orientations and positional relationships indicated by the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on what is shown in the drawings and are merely intended to facilitate or simplify the description of the invention, as the devices and elements referred to have particular orientations and are configured in particular orientations. or should not be construed as limiting the invention. Further, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

In the description of the invention, unless expressly specified or restricted, the terms "attached", "connected", "connected" may be, for example, a fixed connection, a detachable connection, or an integral connection. It may be a physical connection, a mechanical connection, or an electrical connection, and it may be in direct contact or indirectly through an intermediate. Note that it is broadly understood to mean that it may be either internal to the two elements or contiguous. A person skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.

It should be noted that the technical features according to different embodiments of the present invention described below can be combined with each other as long as they do not contradict each other.

As shown in FIGS. 1 and 2, in the preferred embodiment of the piston rod seal structure according to the present invention, such a piston rod seal structure allows the hydraulic cylinder, especially the piston rod 2, to remain in a tilted state for a long period of time. It can be applied to hydraulic cylinders that are heavy in themselves. With such a piston rod seal structure, when the axis of the piston rod 2 deviates, the deviation can be automatically corrected, and the sealing performance of the sealing member is reliable.

The piston rod seal structure described above includes an end cap 1, a piston rod 2, a pivot member 3, and a sealing assembly. The end cap 1 has a hollow structure and is used for installing the piston rod 2 . The inner wall of the end cap 1 is provided with a spherical groove for fitting connection with the rotating member 3 .

A piston rod 2 is provided in the hollow structure of the end cap 1 and installed coaxially with the end cap 1 . The piston rod 2 is longer in length than the end cap 1 and is extendable in its axial direction.

The rotating member 3 is provided between the end cap 1 and the piston rod 2, the outer wall is in rotating contact with the inner wall of the end cap 1, the inner wall is in sliding contact with the outer wall of the piston rod 2, and the piston rod 2 is Its gravitational drive is suitable for guiding the pivoting member 3 to pivot. Specifically, the outer wall of the rotating member 3 is spherical and is in rotating contact with the spherical groove. A mounting groove is formed at one end of the rotating member 3 . The mounting groove is opened at the end of the rotating member 3 and one end is open.

Additionally, the sealing assembly includes a first sealing member 401 provided between the pivot member 3 and the piston rod 2 . Specifically, the first sealing member 401 is provided in the mounting groove of the rotating member 3 and is preferably a V-ring.

When the piston rod 2 protrudes obliquely into the cavity of the end cap 1, its axis is slightly deviated due to the influence of gravity due to its heavy weight, that is, the axis of the piston rod 2 is no longer parallel to the axis of the end cap 1. - 特許庁At this time, since the spherical outer wall of the rotating member 3 slides in the spherical groove of the end cap 1, the first sealing member 401 is always uniformly compressed, ensuring the sealing effect.

The piston rod seal structure further includes a gland 5 fixedly connected to one end of the end cap 1 . One end of the gland 5 is inserted into the hollow structure of the end cap 1 and contacts one end of the first seal member 401 so as to restrict displacement of the first seal member 401 . One end of the gland 5 inserted into the hollow structure has a stepped shape so as to ensure synchronous rotation of the rotating member 3 and the first sealing member 401 , and contact with the first sealing member 401 is provided. The part is arc-shaped.

Additionally, the sealing assembly further includes a second sealing member 402 provided between the pivot member 3 and the end cap 1 and a third sealing member 403 provided between the gland 5 and the end cap 1 . Specifically, in this embodiment, the second sealing member 402 and the third sealing member 403 are preferably O-rings. By providing the second seal member 402 and the third seal member 403, it is possible to enhance the sealing performance of the entire piston rod seal structure and prevent hydraulic oil from leaking from the joints between the respective members.

The present embodiment includes the piston rod seal structure and body described above, the end cap 1 having a hydraulic cylinder fixedly connected to the body at its end remote from the gland 5 and mounted coaxially with the body. provided more. A piston rod 2 protrudes from one end of an end cap 1 with one end mounted on the barrel and the other end remote from the barrel.

This embodiment further provided a hydraulic hoist including the above hydraulic cylinder, hydraulic pump, control valve, hydraulic pipeline and so on. The hydraulic pump, control valve and hydraulic cylinder are connected to each other by a hydraulic pipeline, and the pressurized oil is supplied to the control valve through the hydraulic cylinder and then to the hydraulic cylinder to control the piston rod movement by the control valve . The piston rod has an output end connected to the sluice and controls opening and closing of the sluice.

The operating process of the hydraulic hoist provided by this embodiment will be described below.

When the water gate needs to be closed, oil is extracted by the hydraulic pump and conveyed to the control valve, and from the control valve to the hydraulic cylinder, causing the piston rod 2 to extend with hydraulic oil. The piston rod 2 is maintained at its current length and angle by a control valve when a predetermined stroke is reached. When the piston rod 2 is in a tilted state for a long time, its axis deviates due to the action of gravity and is no longer parallel to the axis of the body. At this time, since the outer wall of the rotating member 3 rotates in the spherical groove, the first sealing member 401 also rotates accordingly. , the lower half is compressed unevenly, a gap is generated at the connecting portion with the piston rod 2, and leakage of hydraulic oil does not occur.

When the sluice needs to be opened, the control valve controls the hydraulic cylinder to move the piston rod 2 back (that is, retract toward the fuselage) until the sluice is fully opened.

It is clear that the above examples are merely examples for the purpose of clarifying rather than limiting the embodiments. A person skilled in the art can make various modifications or changes based on the above description. It is neither necessary nor possible to cover all embodiments here. Obvious variations or modifications introduced therefrom are still covered by the protection scope of the invention.

1. end cap;2. piston rod;3. rotating member, 401 . first sealing member, 402 . second sealing member, 403 . a third sealing member;5. ground

Claims (10)

an end cap (1) having a hollow structure;
a piston rod (2) passing through the end cap (1);
Provided between the end cap (1) and the piston rod (2), the outer wall is in rotational contact with the inner wall of the end cap (1) and the inner wall is in sliding contact with the outer wall of the piston rod (2). , a pivoting member (3) adapted to be rotated by the gravitational drive of said piston rod (2);
A sealing assembly comprising a first sealing member (401) provided between said pivot member (3) and said piston rod (2). The inner wall of the end cap (1) is provided with a spherical groove, and the outer wall of the rotating member (3) is spherical and is in rotational contact with the spherical groove. The described piston rod seal construction. 2. The piston rod seal structure according to claim 1, wherein a mounting groove in which said first seal member (401) is provided is opened at one end of said rotating member (3). The piston rod seal structure according to claim 1, further comprising a gland (5) fixedly connected to one end of the end cap (1). The piston rod seal structure according to claim 4, characterized in that one end of said gland (5) is inserted into said hollow structure and abuts on one end of said first seal member (401). 6. The gland (5) according to claim 5, wherein one end inserted into the hollow structure has a stepped shape, and a contact portion with the first seal member (401) has an arc shape. Piston rod seal structure. The piston rod seal structure according to claim 1, wherein said first seal member (401) is a V-ring. Said sealing assembly comprises a second sealing member (402) provided between said pivot member (3) and said end cap (1) and a second sealing member (402) provided between said gland (5) and said end cap (1). 5. A piston rod seal arrangement according to claim 4, further comprising a third seal member (403) which is mounted on the piston rod. A piston rod seal structure according to any one of claims 4 to 6, further comprising the end of said end cap (1) remote from said gland (5) being fixedly connected, and said end cap Hydraulic cylinder, characterized in that it includes a body that is coaxial with (1). A hydraulic hoist comprising the hydraulic cylinder of claim 9 .

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