Handling arm rotary joint

Abstract

The utility model relates to a loading and unloading arm accessory technical field especially a kind of loading and unloading arm swivel joint, including inner ring, outer ring is movably sheathed in inner ring outer side, flange ring is assembled with inner ring and outer ring same side, lining ring is movably assembled between inner ring and outer ring, and steel ball is arranged between lining ring and outer ring to reduce resistance.The loading and unloading arm swivel joint of the utility model increases a replaceable lining ring in annular raceway, annular transmission groove is also similarly processed on lining ring, the hardness of annular transmission groove surface is increased by quenching heat treatment, steel ball and the annular transmission groove contact of lining ring, and the longer service life can be realized by mutual cooperation;In long-term use, lining ring or steel ball wear can be directly replaced, without replacing rotating bearing main body, improve economy.

Description

Technical Field

[0001] This utility model relates to the technical field of loading and unloading arm accessories, and in particular to a loading and unloading arm rotary joint. Background Technology

[0002] Marine loading arms are specialized devices used in ports and docks to connect pipelines to ships for loading and unloading liquids. Each loading arm has six rotary joints for connecting pipelines, allowing the arm to rotate with six degrees of freedom when connected to pipelines and to move freely in all directions with the ship. The pipelines bear the weight and pressure of the liquid, and the external structure also exerts loads on the rotary joints; these loads are constantly changing at different positions of the loading arm.

[0003] After a period of use, the raceways of the rotary joint of the loading arm will wear out. This is because the bearing body needs to be welded to the pipeline of the loading arm, and the welding material is low-carbon steel, resulting in low raceway hardness and contact fatigue pitting. Under excessive static or impact loads, the raceways and rolling elements may undergo plastic deformation, leading to reduced operational accuracy. Reduced accuracy will cause seal leakage. The main function of the main sealing ring is to prevent the leakage of the medium inside the pipeline. The dustproof sealing ring is used because the coastal environment is harsh, and it is necessary to prevent external moisture or salt spray from entering the rotary joint, which can also corrode the raceways.

[0004] Wear can also lead to unreliable seals or severe salt spray conditions, causing abrasive wear on the rolling elements or raceways, eventually corroding and rendering the rotary bearing unusable. Meanwhile, alternating stresses caused by varying loads under different conditions can also lead to raceway fatigue failure. Utility Model Content

[0005] The technical problem this utility model aims to solve is that after a period of use, the raceway of the current rotary joint will wear, resulting in reduced operating accuracy. Reduced accuracy will lead to seal leakage and eventually corrosion and scrapping of the rotary bearing. At the same time, the alternating stress caused by the changing load under various conditions will also cause fatigue failure of the raceway.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a loading and unloading arm rotary joint, including an inner ring, an outer ring movably fitted on the outer side of the inner ring, a flange ring assembled on the same side of the inner ring and the outer ring, a bushing movably fitted between the inner ring and the outer ring, and a steel ball for reducing resistance provided between the bushing and the outer ring.

[0007] The inner ring has an annular raceway on its outer arc surface that mates with the bushing.

[0008] Both the inner arc-shaped surface of the outer ring and the outer arc-shaped surface of the bushing are provided with annular transmission grooves that cooperate with the steel ball.

[0009] The hardness of the steel ball is 62~66HRC.

[0010] The hardness of the annular transmission groove is 59~64HRC.

[0011] The lower end of the outer arc surface of the inner ring has a lateral protrusion, and an annular limiting groove that matches the lateral protrusion is formed on the inner arc surface of the outer ring.

[0012] The beneficial effects of this utility model are:

[0013] (1) The rotating joint of the loading and unloading arm of this utility model adds a replaceable bushing in the annular raceway. The bushing is also machined with an annular transmission groove. The surface of the annular transmission groove is hardened by quenching heat treatment. The steel ball and the annular transmission groove of the bushing are in contact and cooperate with each other to achieve a longer service life.

[0014] (2) During long-term use, the bushing or steel ball can be directly replaced when worn, without replacing the main body of the rotary bearing, thus improving economy. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the internal structure of a traditional ringless rotary joint. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Figure 1 and Figure 2 The shown loading and unloading arm rotary joint includes an inner ring 1, an outer ring 2 movably fitted on the outside of the inner ring 1, a flange ring 3 mounted on the same side of the inner ring 1 and the outer ring 2, a bushing 4 movably fitted between the inner ring 1 and the outer ring 2, and a steel ball 5 for reducing resistance between the bushing 4 and the outer ring 2.

[0021] To facilitate the assembly, an annular raceway 6 is provided on the outer arc surface of the inner ring 1 to mate with the bushing 4.

[0022] To facilitate rotational adjustment, annular transmission grooves 7 that mate with steel balls 5 are provided on the inner arc-shaped surface of the outer ring 2 and the outer arc-shaped surface of the bushing 4.

[0023] To facilitate the assembly process, the hardness of steel ball 5 is 62~66 HRC.

[0024] To improve durability, the hardness of the annular transmission groove 7 is 59~64HRC.

[0025] To improve lateral positioning, the lower end of the outer arc surface of the inner ring 1 has a transverse protrusion 8, and the inner arc surface of the outer ring 2 has an annular positioning groove that matches the transverse protrusion 8.

[0026] The outer ring 2 is movable and limited by the annular limiting groove on the transverse protrusion 8 and the inner ring 1.

[0027] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A rotary joint for loading and unloading arms, comprising an inner ring (1), characterized in that: The outer ring (2) is movably fitted on the outer side of the inner ring (1). A flange ring (3) is fitted on the same side of the inner ring (1) and the outer ring (2). A bushing (4) is movably fitted between the inner ring (1) and the outer ring (2). A steel ball (5) to reduce resistance is provided between the bushing (4) and the outer ring (2).

2. The rotary joint for loading and unloading arms according to claim 1, characterized in that: The inner ring (1) has an annular raceway (6) on its outer arc surface that matches the bushing (4).

3. The rotary joint for loading and unloading arms according to claim 1, characterized in that: The inner arc surface of the outer ring (2) and the outer arc surface of the bushing (4) are provided with annular transmission grooves (7) that cooperate with the steel ball (5).

4. The rotary joint for loading and unloading arms according to claim 1, characterized in that: The hardness of the steel ball (5) is 62~66HRC.

5. The rotary joint for loading and unloading arms according to claim 3, characterized in that: The hardness of the annular transmission groove (7) is 59~64HRC.

6. The rotary joint for loading and unloading arms according to claim 1, characterized in that: The lower end of the outer arc surface of the inner ring (1) has a transverse protrusion (8), and the inner arc surface of the outer ring (2) has an annular limiting groove that matches the transverse protrusion (8).

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