Sealing structure for hydraulic cylinder

Abstract

The utility model provides a sealing structure for a hydraulic cylinder, which relates to the technical field of hydraulic cylinders and comprises a hydraulic cylinder body and a telescopic rod movably arranged at the upper end of the hydraulic cylinder body. The upper end of the hydraulic cylinder body is provided with an internal thread groove and is in threaded connection with a sealing seat; a sealing sleeve is embedded in the upper part of the sealing seat, and a threaded connecting sleeve matched with the internal thread groove is arranged at the lower part of the sealing seat; a gap is formed between the threaded connecting sleeve and the inner wall of the sealing seat, and a plurality of elastic bolts which are uniformly distributed are arranged in the gap; a plurality of slots matched with the elastic bolts are formed in the outer side wall of the hydraulic cylinder body; a shaft hole matched with the telescopic rod is formed in the inner side of the sealing sleeve, six sealing grooves are evenly distributed in the shaft hole from top to bottom, and each sealing groove is provided with a dustproof ring, a first guide belt, a first sealing ring, a second guide belt, a second sealing ring and a third guide belt from top to bottom.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a sealing structure for a hydraulic cylinder. Background Technique

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it can eliminate the deceleration device, and there is no transmission gap, and the motion is stable. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] During the production and manufacturing of a hydraulic cylinder, a corresponding sealing device will be arranged in its inner cavity to ensure the use effect of the hydraulic cylinder; the existing sealing device for a hydraulic cylinder usually adopts a threaded connection. Although it can achieve the effect of sealing and partitioning, if the hydraulic cylinder vibrates during use, it will cause looseness between the sealing device and the hydraulic cylinder, affecting its use effect. Moreover, for the sealing ring gasket on the existing hydraulic cylinder sealing device, due to the long-term reciprocating sliding of the telescopic rod, the sealing ring will wear, resulting in poor sealing, thereby increasing the risk of safety accidents caused by oil leakage and requiring frequent replacement of the sealing ring.

[0004] Therefore, the utility model proposes a sealing structure for a hydraulic cylinder. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model proposes a sealing structure for a hydraulic cylinder, which can solve the problem that the sealing device and the hydraulic cylinder are loosened due to vibration during the use of the hydraulic cylinder body, and solve the problem that the sealing ring wears due to the long-term reciprocating sliding of the telescopic rod, resulting in poor sealing.

[0006] The technical solution of the utility model is realized as follows:

[0007] A sealing structure for a hydraulic cylinder includes a hydraulic cylinder body and a telescopic rod. The telescopic rod is movably arranged at the upper end of the hydraulic cylinder body; an inner spiral groove is opened at the upper end of the hydraulic cylinder body, and a sealing seat is threadedly connected; a sealing sleeve is embedded in the upper part of the sealing seat, and a threaded connecting sleeve adapted to the inner spiral groove is arranged at the lower part; a gap is arranged between the threaded connecting sleeve and the inner wall of the sealing seat, and a plurality of uniformly distributed elastic pins are arranged in the gap; a plurality of slots adapted to the elastic pins are arranged on the outer side wall of the hydraulic cylinder body;

[0008] A shaft hole adapted to the telescopic rod is arranged on the inner side of the sealing sleeve. Six sealing grooves are uniformly distributed in the shaft hole from top to bottom. A dust-proof ring, a first guiding band, a first sealing ring, a second guiding band, a second sealing ring and a third guiding band are respectively arranged in the sealing grooves from top to bottom.

[0009] Preferably, the elastic bolt includes a bolt body and a tension spring. One end of the bolt penetrates through the inner wall of the sealing seat and extends into the gap; the other end of the bolt body is provided with a hand-held part; the tension spring is sleeved on the bolt body, and one end of it is connected to the inner wall of the sealing seat.

[0010] Preferably, the dust-proof ring is a J-shaped dust-proof sealing ring.

[0011] Preferably, the first sealing ring adopts a Y-shaped sealing ring.

[0012] Preferably, the second sealing ring adopts a Gleitring.

[0013] Compared with the prior art, the present utility model has the following advantages:

[0014] With this solution, the threaded connection sleeve of the sealing seat is threadedly connected with the inner spiral thread of the hydraulic cylinder body. At the same time, after the sealing seat is connected, the elastic bolt in the gap between the inner wall of the sealing seat and the threaded connection sleeve automatically inserts into the hydraulic cylinder body to complete the fixation of the fiber of the sealing seat, solving the problem that the hydraulic cylinder body vibrates during use, causing looseness between the sealing device and the hydraulic cylinder; at the same time, a sealing sleeve is embedded in the upper part of the sealing seat, and six sealing grooves are evenly distributed from top to bottom in the shaft hole of the sealing sleeve. The sealing grooves are respectively provided with a dust-proof ring, a first guiding belt, a first sealing ring, a second guiding belt, a second sealing ring and a third guiding belt from top to bottom. Double-layer sealing is carried out through the first sealing ring and the second sealing ring to increase the tightness. The dust-proof ring is provided outside for dust-proofing, and the guiding belt is arranged adjacent to the sealing ring for guiding and supporting functions, correctly guiding the telescopic rod to move in a uniform straight line, avoiding the phenomenon that the telescopic rod deviates due to uneven force, and solving the problem that the long-term reciprocating sliding of the telescopic rod will cause wear of the sealing ring and result in poor sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of a sealing structure for a hydraulic cylinder of the present utility model;

[0017] Figure 2 It is a schematic structural diagram of the hydraulic cylinder body;

[0018] Figure 3 It is a schematic structural diagram of the sealing seat;

[0019] Attached drawing reference numerals: 1 - Hydraulic cylinder body; 2 - Telescopic rod; 3 - Sealing seat; 31 - Threaded connecting sleeve; 32 - Sealing sleeve; 321 - Dust ring; 322 - First guide strip; 323 - First sealing ring; 324 - Second guide strip; 325 - Second sealing ring; 326 - Third guide strip; 33 - Gap; 34 - Pin body; 35 - Tension spring; 4 - Slot; 5 - Inner spiral groove. Detailed implementation manners

[0020] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] This embodiment provides a sealing structure for a hydraulic cylinder, as Figure 1 、 Figure 2 and Figure 3As shown in the figure, it includes a hydraulic cylinder body 1 and a telescopic rod 2. The telescopic rod 2 is movably arranged at the upper end of the hydraulic cylinder body 1. An internal spiral groove 5 is formed at the upper end of the hydraulic cylinder body 1 and is threadedly connected with a sealing seat 3. A sealing sleeve 32 is embedded in the upper part of the sealing seat 3, and a threaded connecting sleeve 31 adapted to the internal spiral groove 5 is arranged at the lower part. A gap 33 is provided between the threaded connecting sleeve 31 and the inner wall of the sealing seat 3, and a plurality of evenly distributed elastic pins 34 are arranged in the gap 33. A plurality of slots 4 adapted to the elastic pins 34 are arranged on the outer side wall of the hydraulic cylinder body 1.

[0024] An axial hole adapted to the telescopic rod 2 is provided on the inner side of the sealing sleeve 32. Six sealing grooves are evenly distributed from top to bottom in the axial hole. A dust-proof ring 321, a first guide band 322, a first sealing ring 323, a second guide band 324, a second sealing ring 325 and a third guide band 326 are respectively arranged in the sealing grooves from top to bottom.

[0025] Working principle: As shown in Figure 1 , Figure 2 and Figure 3 the figure, the threaded connecting sleeve 31 of the sealing seat 3 is threadedly connected with the internal spiral of the hydraulic cylinder body 1. At the same time, after the sealing seat 3 is connected, the elastic pins in the gap 33 between the inner wall of the sealing seat 3 and the threaded connecting sleeve 31 automatically insert into the hydraulic cylinder body 1 to complete the fiber fixation of the sealing seat 3, solving the problem that the hydraulic cylinder body 1 vibrates during use, causing looseness between the sealing device and the hydraulic cylinder. At the same time, a sealing sleeve 32 is embedded in the upper part of the sealing seat 3. Six sealing grooves are evenly distributed from top to bottom in the axial hole of the sealing sleeve 32. A dust-proof ring 321, a first guide band 322, a first sealing ring 323, a second guide band 324, a second sealing ring 325 and a third guide band 326 are respectively arranged in the sealing grooves from top to bottom. Double-layer sealing is carried out through the first sealing ring 323 and the second sealing ring 325 to increase the tightness. The dust-proof ring 321 is provided outside for dust prevention. The guide band is arranged adjacent to the sealing ring for guiding and supporting functions, correctly guiding the telescopic rod 2 to move in a uniform straight line, and avoiding the phenomenon that the telescopic rod 2 deviates due to uneven force bearing, solving the problem that the sealing ring wears due to the long-term back-and-forth sliding of the telescopic rod 2, resulting in poor sealing.

[0026] In this embodiment, the elastic bolt includes a bolt body 34 and a tension spring 35. One end of the bolt body 34 penetrates through the inner wall of the sealing seat 3 and extends into the gap 33; the other end of the bolt body 34 is provided with a hand-held part; the tension spring is sleeved on the bolt body 34, and one end of it is connected to the inner wall of the sealing seat 3. When the sealing seat 3 is threadedly connected to the inner spiral groove 5 through the threaded connection sleeve 31, the bolt body 34 will be inserted into the slot 4 on the outer wall of the hydraulic cylinder body 1 under the action of the tension spring 35 to complete the sealing and fixing of the fiber of the sealing seat 3; at the same time, when it is necessary to replace the sealing seat 3, the limit can be released by pulling the hand-held part at the other end of the bolt body 34 that penetrates through the outer wall of the sealing seat 3, and then the threaded connection is released to replace and maintain the sealing component.

[0027] In this embodiment, the setting method of the guiding belt can ensure that the sealing sleeve 32 has the same radial load at each position, avoiding local damage to the sealing sleeve 32 caused by different bearing capacities at each place and oil leakage caused by local damage.

[0028] In this embodiment, the dust-proof ring 321 is a J-shaped dust-proof sealing ring, also known as a J-shaped non-skeleton dust-proof ring, which is used for dust-proof at the exposed part of the telescopic rod 2.

[0029] In this embodiment, the first sealing ring 323 adopts a Y-shaped sealing ring, which is widely used in reciprocating motion sealing devices. The addition of the first sealing ring 323, that is, the Y-shaped sealing ring, can perform secondary sealing on the hydraulic oil in the hydraulic cylinder in the sealing sleeve 32, effectively increasing the tightness of the sealing sleeve 32.

[0030] In this embodiment, the second sealing ring 325 adopts a Gleitring or a Strseal, which can prevent foreign objects from entering the hydraulic cylinder and causing damage to the hydraulic cylinder.

[0031] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sealing structure for a hydraulic cylinder, characterized in that: The invention comprises a hydraulic cylinder body (1) and a telescopic rod (2), wherein the telescopic rod (2) is movably arranged at the upper end of the hydraulic cylinder body (1); the upper end of the hydraulic cylinder body (1) is provided with an inner spiral groove (5) and is threadedly connected to a sealing seat (3); the upper part of the sealing seat (3) is embedded with a sealing sleeve (32), and the lower part is provided with a threaded connection sleeve (31) matched with the inner spiral groove (5); a gap (33) is provided between the threaded connection sleeve (31) and the inner wall of the sealing seat (3), and a plurality of evenly distributed elastic pins are provided in the gap (33); the outer wall of the hydraulic cylinder body (1) is provided with a plurality of slots (4) matched with the elastic pins; An axial hole adapted to the telescopic rod (2) is provided on the inner side of the sealing sleeve (32), and six sealing grooves are evenly distributed from top to bottom on the axial hole, and the sealing grooves are respectively provided with a dust ring (321), a first guide belt (322), a first sealing ring (323), a second guide belt (324), a second sealing ring (325) and a third guide belt (326) from top to bottom.

2. A sealing structure for a hydraulic cylinder according to claim 1, characterized in that: The elastic latch comprises a latch body (34) and a tension spring (35); one end of the latch body (34) penetrates the inner wall of the sealing seat (3) and extends into the gap (33); the other end of the latch body (34) is provided with a hand-held portion; the tension spring is sleeved on the latch body (34), and one end of the tension spring is connected to the inner wall of the sealing seat (3).

3. A sealing structure for a hydraulic cylinder according to claim 2, characterized in that: The dustproof ring (321) is a J-shaped dustproof sealing ring.

4. A sealing structure for a hydraulic cylinder according to claim 2, characterized in that: The first sealing ring (323) is a Y-shaped sealing ring.

5. A sealing structure for a hydraulic cylinder according to claim 2, characterized in that: The second sealing ring (325) is a Gly ring.

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