Sealing structure for swinging hydraulic cylinder of underwater mechanical arm

Abstract

The invention relates to an underwater mechanical arm swing hydraulic cylinder sealing structure which comprises an isolation piece and bearing covers installed at the left end and the right end of the isolation piece, the upper end and the lower end of the isolation piece are connected with a shell of a swing hydraulic cylinder and an inner shaft sleeve of the swing hydraulic cylinder respectively, and each bearing cover comprises a cover body and a boss protruding along the upper end of the cover body. A boss is arranged on the cover body, a first installation contact angle is formed between the boss and the cover body, the end faces of the two sides of the upper end of the isolation piece are installed on the first installation contact angle respectively, the shell is provided with a second installation contact angle matched with the boss, and the upper end face of the boss is installed on the second installation contact angle. The underwater mechanical arm swing hydraulic cylinder sealing structure is high in sealing strength, the leakage phenomenon is effectively avoided, and the machining and assembling cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of swing hydraulic cylinders for underwater robotic arms, and particularly to a sealing structure for a swing hydraulic cylinder of an underwater robotic arm. Background Art

[0002] A swing hydraulic cylinder is an actuator in a hydraulic system that converts the hydraulic pressure energy provided by a hydraulic pump into the mechanical energy (torque and rotational speed) of its output shaft. The liquid is the medium for transmitting force and motion. The prominent advantage of a swing hydraulic cylinder is that the load can directly obtain reciprocating swinging motion without any speed-changing mechanism.

[0003] The sealing performance of the blade seal of a swing hydraulic cylinder is an important factor affecting the magnitude of its output torque. Good sealing performance can keep the pressure in the high-pressure chamber of the swing hydraulic cylinder stable, so that the operating speed and the magnitude of the output torque of the swing hydraulic cylinder are stable, that is, the dynamic performance of the swing hydraulic cylinder is excellent. However, the sealing performance of the hydraulic cylinders in the prior art is not good, resulting in poor stability of the hydraulic cylinders. In the sealing structure of the swing hydraulic cylinder of a traditional underwater robotic arm, the sealing between the first and second isolating members and the relatively fixed members between the first chamber and the second chamber adopts the contact sealing of the corner ends of the first and second isolating members directly contacting multiple relatively fixed members respectively. This requires high processing technology and has low sealing reliability, resulting in a reduced service life of the hydraulic cylinder. At the same time, it will also cause oil leakage in the swing hydraulic cylinder, seriously affecting its normal operation. Summary of the Invention

[0004] In view of the above, it is necessary to provide a sealing structure for a swing hydraulic cylinder of an underwater robotic arm with high sealing strength and capable of improving the service life of the hydraulic cylinder.

[0005] To this end, the present invention provides a sealing structure for a swing hydraulic cylinder of an underwater robotic arm, including an isolating member and bearing covers installed at the left and right ends of the isolating member. The upper and lower ends of the isolating member are respectively connected to the outer shell of the swing hydraulic cylinder and the inner bushing of the swing hydraulic cylinder. The bearing cover includes a cover body and a convex platform protruding from the upper end of the cover body. A first installation contact angle is formed between the convex platform and the cover body. The two side end faces at the upper end of the isolating member are respectively installed on the first installation contact angle. The outer shell has a second installation contact angle adapted to the convex platform, and the upper end face of the convex platform is installed on the second installation contact angle.

[0006] According to the sealing structure for the swing hydraulic cylinder of the underwater robotic arm, a sealing member is provided between the end face of the convex platform and the outer shell.

[0007] According to the sealing structure for the swing hydraulic cylinder of the underwater robotic arm, an end face installation groove is formed on the end face of the convex platform, and the sealing member is installed in the end face installation groove.

[0008] According to the swing hydraulic cylinder sealing structure of the underwater robotic arm, the seal is a Che's C-type static seal.

[0009] According to the swing hydraulic cylinder sealing structure of the underwater robotic arm, the inner angle of the end face mounting groove is an arc chamfer.

[0010] According to the swing hydraulic cylinder sealing structure of the underwater robotic arm, the first mounting contact angle is an arc chamfer.

[0011] According to the swing hydraulic cylinder sealing structure of the underwater robotic arm, the first mounting contact angle is a rounded corner.

[0012] According to the swing hydraulic cylinder sealing structure of the underwater robotic arm, sealing connectors are provided at the left and right ends of the inner shaft sleeve and the left and right ends of the spacer.

[0013] According to the swing hydraulic cylinder sealing structure of the underwater robotic arm, the spacer is provided with an arc-shaped notch adapted to the sealing connector, and the inner shaft sleeve is provided with a seal mounting groove adapted to the sealing connector.

[0014] According to the swing hydraulic cylinder sealing structure of the underwater robotic arm, an O-ring seal is provided in the seal mounting groove.

[0015] Compared with the prior art, in the above swing hydraulic cylinder sealing structure of the underwater robotic arm, the corner end of the spacer directly contacts the end face of the first mounting contact angle of the bearing cover, making the structure more stable and the sealing performance better. The end face rounded corner contact sealing method is adopted to improve the sealing strength in the cavity. The sealing forms in which the right-angle end faces of the spacer in the traditional swing hydraulic cylinder sealing structure of the underwater robotic arm are respectively sealed with the bearing cover and the housing are abandoned, effectively avoiding problems such as poor right-angle sealing performance, low volumetric efficiency, and high requirements for machining and assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the swing hydraulic cylinder sealing structure of the underwater robotic arm of the present invention.

[0018] Figure 2 It is a longitudinal sectional view of the swing hydraulic cylinder sealing structure of the underwater robotic arm of the present invention.

[0019] Figure 3 It is a transverse sectional view of the swing hydraulic cylinder sealing structure of the underwater robotic arm of the present invention.

[0020] Figure 4 is Figure 3 an enlarged schematic view of part A of

[0021] Figure 5 It is a partial sectional schematic view of the swing hydraulic cylinder sealing structure of the present invention.

[0022] Figure 6 is Figure 5 an enlarged schematic view of part B of

[0023] Description of main component symbols

[0024] 1 - Swing hydraulic cylinder; 2 - First chamber; 3 - Second chamber; 4 - First separator; 5 - Second separator; 6 - Separator; 7 - Bearing cover; 8 - Outer shell; 9 - Inner bushing; 10 - First installation contact angle; 11 - Seal; 12 - O-ring seal; 13 - Cover body; 14 - Boss; 15 - Second installation contact angle.

[0025] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific embodiments

[0026] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be described in detail below in conjunction with the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The described embodiments are only a part of the embodiments of the present invention, 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 invention without creative efforts shall fall within the scope of protection of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used herein in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] In each embodiment, for the purpose of description and not limitation of the present invention, the term "connection" used in the specification and claims of the present invention patent application is not limited to physical or mechanical connection, but may include electrical connection, whether direct or indirect. "Upper", "lower", "below", "left", "right", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0029] Such as Figure 1 andFigure 6 As shown, a contact seal is provided between the first isolation member 4 and the second isolation member 5 between the swing hydraulic cylinder 1 of the underwater manipulator, and the relative fixed member.

[0030] An underwater manipulator swing hydraulic cylinder sealing structure includes an isolation member 6 and bearing caps 7 installed at the left and right ends of the isolation member 6. The upper and lower ends of the isolation member 6 are respectively connected to the outer shell 8 of the swing hydraulic cylinder 1 and the inner bushing 9 of the swing hydraulic cylinder 1. The bearing cap 7 includes a cap body 13 and a convex platform 14 protruding from the upper end of the cap body 13. A first installation contact angle 10 is formed between the convex platform 14 and the cap body 13. The upper end sides of the isolation member 6 are respectively installed on the first installation contact angle 10. The outer shell 8 has a second installation contact angle 15 adapted to the convex platform 14, and the upper end surface of the convex platform 14 is installed on the second installation contact angle 15. The outer shell 8 is respectively connected to the upper end surface of the isolation member 6 and the upper end surface of the bearing cap 7. The horizontal height of the lower end surface of the outer shell 8 is adapted to the lower end surface of the convex platform 14, so that the sealing performance of the isolation member 6 is better.

[0031] A sealing member 11 is provided between the end surface of the convex platform 14 and the outer shell 8. For sealing stability, an end surface installation groove is provided on the end surface of the convex platform 14, and the sealing member 11 is installed in the end surface installation groove. As a specific implementation manner, the sealing member 11 is a Che's C-type static seal. The inner angle of the end surface installation groove is an arc chamfer to improve the sealing performance.

[0032] The first installation contact angle 10 is an arc chamfer to improve the sealing performance. Of course, the first installation contact angle 10 can also be a rounded corner.

[0033] In the present invention, the first installation contact angle 10 of the bearing cap 7 contacts the end surfaces on both sides of the isolation member 6, and the sealing member 11 in the end surface installation groove of the bearing cap 7 is used to strengthen the sealing between the isolation member 6, the bearing cap 7 and the outer shell 8. Since the first installation contact angle 10 is in full contact with the end surfaces on both sides of the isolation member 6, the sealing effect will not be affected by the accuracy of the relative fixed member.

[0034] Sealing connectors are provided at the left and right ends of the inner bushing 9 and the left and right ends of the isolation member 6. The isolation member 6 is provided with an arc-shaped notch adapted to the sealing connector, and the inner bushing 9 is provided with a sealing installation groove adapted to the sealing connector. An O-ring 12 is provided in the sealing installation groove.

[0035] The bearing cap 7 is installed at both ends of the first chamber 2 and the second chamber 3 and cooperates with the outer shell 8. The end surface adopts a Che's C-type static seal. The combination of the end surface rounded corner contact seal and the end surface Che's C-type static seal not only has good sealing performance but also improves the service life.

[0036] In several specific embodiments provided by the present invention, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention. In addition, it is obvious that the term "including" does not exclude other units or steps, and the singular does not exclude the plural. The terms such as "first" and "second" are used to denote names and do not represent any specific order.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An underwater manipulator swing hydraulic cylinder sealing structure, characterized in that, It includes a spacer and bearing caps installed at the left and right ends of the spacer. The upper and lower ends of the spacer are respectively connected to the housing of the swing hydraulic cylinder and the inner bushing of the swing hydraulic cylinder. The bearing cap includes a cap body and a boss protruding from the upper end of the cap body. A first installation contact angle is formed between the boss and the cap body. The two side end faces at the upper end of the spacer are respectively installed on the first installation contact angle. The housing has a second installation contact angle adapted to the boss, and the upper end face of the boss is installed on the second installation contact angle.

2. The sealing structure of the swing hydraulic cylinder of the underwater manipulator according to claim 1, characterized in that A seal is provided between the end face of the boss and the housing.

3. The swing hydraulic cylinder sealing structure of the underwater manipulator according to claim 2, characterized in that, An end face installation groove is formed in the end face of the boss, and the seal is installed in the end face installation groove.

4. The sealing structure of the swing hydraulic cylinder of the underwater manipulator according to claim 2, wherein, The seal is a Che's C-type static seal.

5. The sealing structure of the swing hydraulic cylinder of the underwater manipulator according to claim 3, characterized in that, The inner angle of the end face installation groove is an arc chamfer.

6. The sealing structure of the swing hydraulic cylinder of the underwater robotic arm according to claim 1, characterized in that, The first installation contact angle is an arc chamfer.

7. The swing hydraulic cylinder sealing structure of the underwater manipulator according to claim 6, characterized in that The second installation contact angle is a fillet.

8. The sealing structure of the swing hydraulic cylinder of the underwater robotic arm according to claim 1, characterized in that, Sealing connectors are provided at the left and right ends of the inner bushing and the left and right ends of the spacer.

9. The sealing structure of the swing hydraulic cylinder of the underwater manipulator according to claim 8, characterized in that, An arc-shaped notch adapted to the sealing connector is formed in the spacer, and a seal installation groove adapted to the sealing connector is formed in the inner bushing.

10. The sealing structure of the swing hydraulic cylinder of the underwater robotic arm according to claim 9, characterized in that, An O-ring seal is provided in the seal installation groove.

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