A mechanical locking structure suitable for the inner arm of a loading / unloading arm.

Abstract

This utility model relates to the field of marine loading and unloading boom technology, and in particular to a mechanical locking structure suitable for the inner arm of a loading and unloading boom. It includes a main column, a loading and unloading boom mounted on the main column, a lateral assembly frame welded to the side wall of the main column, and a base. Two horizontally arranged locking pins are installed on the lateral assembly frame, and a first connecting rod is installed at the lower end of each locking pin via a first connector. This mechanical locking structure for the inner arm of a loading and unloading boom moves the main locking pin position from the top of the column to a position near the ground on the unloading boom. When personnel pull the operating handle from below the column, they can see whether the locking pins are in the correct position, eliminating the previously existing blind spot. Through a redesigned structure, the original single horizontal locking mechanism is eliminated, and the inner arm locking mechanism is changed to two locking pins. Simultaneously, the locking limit is changed to a closed limit groove, ensuring that the original locking reliability remains unchanged while reliably locking both the horizontal arm and the inner arm.

Description

Technical Field

[0001] This utility model relates to the field of marine loading and unloading arm technology, and in particular to a mechanical locking structure suitable for the inner arm of a loading and unloading arm. Background Technology

[0002] Marine loading booms, also known as marine unloading booms, are specialized devices installed at docks for loading and unloading petrochemical fluids or gases transported by oil tankers. They generally consist of a column, inner boom, outer boom, and three-dimensional joints. When in the retracted and maintenance positions, the loading boom should be equipped with mechanical or hydraulic locking devices to restrict the movement of the inner and outer booms. Generally, the outer boom is hydraulically locked using a manual isolation valve to prevent its deployment; the inner boom typically has a manually controlled mechanical locking device on the shore-end column side to prevent movement due to strong winds when in the retracted position, including horizontal rotation and overall downward tilting. Furthermore, the locking mechanism in the retracted position should be designed to remain inactive during boom operation.

[0003] Currently, the mechanical locking mechanisms used on loading booms include horizontal locking and inner arm locking. The locking pin is installed at the highest point of the column, while the locking operation handle is located at the lower end of the column, easily accessible to personnel. By pulling the handle, an intermediate connector connects the handle and the locking pin, locking or unlocking it. The loading boom itself is counterweight balanced, but due to strong winds at the seaside or prolonged use, the boom may become unbalanced. In this case, the boom body may jam the locking pin, making it very difficult for personnel to pull it when unlocking is needed. To achieve horizontal and inner arm unlocking, the operator needs to climb to the top to observe the direction the locking pin is jammed, then reverse the boom operation to free the locking pin. The same problem exists during locking: the column's height can obstruct the operator's view or prevent them from visually determining whether the locking pin is properly engaged. Utility Model Content

[0004] The technical problem this invention aims to solve is that the main body currently used on loading and unloading arms is too high, which can lead to obstructed vision or prevent operators from visually judging whether the locking pin is in place.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a mechanical locking structure suitable for the inner arm of a loading and unloading arm, including a main column, a loading and unloading arm installed on the main column, a lateral assembly frame welded to the side wall of the main column, and a base. Two horizontally arranged locking pins are installed on the lateral assembly frame. A first connecting rod is installed at the lower end of the locking pin through a first connector. A second connecting rod is installed at the lower end of the first connecting rod through a spiral buckle. A shackle is installed at the lower end of the second connecting rod through a second connector. A short ring chain is fitted at the lower end of the shackle. A control frame for connecting an operating handle is installed on the outside of the base. A fixed seat connected to the bottom of the short ring chain is movably assembled inside the control frame. A limit plate is installed at the end of the loading and unloading arm, and a limit groove is formed on the limit plate.

[0006] A spring is installed on the outer side of the locking pin inside the lateral assembly frame.

[0007] The base sidewall is bolted with a bottom limiter that cooperates with the operating handle.

[0008] A tightening joint and a connecting plate located at the upper end of the tightening joint are provided between the locking pin and the first joint.

[0009] The first connector and the tightening connector are movably assembled via a pin.

[0010] The operating handle includes an n-shaped flip frame with its shaft mounted inside the control frame, an external flip arm fixed to the side wall of the flip frame, and an extension arm threaded onto the outer end of the external flip arm.

[0011] The beneficial effects of this utility model are:

[0012] (1) The mechanical locking structure of this utility model applicable to the inner arm of the loading and unloading arm moves the main locking pin position from the top of the column to the position of the unloading arm close to the ground. When the personnel pull the operating handle under the column, they can see whether the locking pin is in the correct position, eliminating the original blind spot.

[0013] (2) By redesigning the structure, the original single horizontal locking mechanism was eliminated, the inner arm locking mechanism was changed to two locking pins, and the locking limit was changed to a closed limit groove. This ensures that the original locking reliability remains unchanged, and that both the horizontal and inner arms of the unloading arm can be reliably locked. Attached Figure Description

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

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2This is a partial structural schematic diagram of the present invention.

[0017] Figure 3 This is a partial structural schematic diagram of the lateral assembly frame in this utility model.

[0018] Figure 4 This is a partial structural diagram of the base in this utility model.

[0019] Figure 5 This is a schematic diagram of the control handle in this utility model. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The mechanical locking structure shown is suitable for the inner arm of a loading and unloading arm, including a main column 1, a loading and unloading arm installed on the main column, a lateral assembly frame 2 welded to the side wall of the main column 1, and a base 3. Two horizontally arranged locking pins 4 are installed on the lateral assembly frame 2. A first connecting rod 6 is installed at the lower end of the locking pin 4 through a first connector 5. A second connecting rod 8 is installed at the lower end of the first connecting rod 6 through a spiral buckle 7. A shackle 10 is installed at the lower end of the second connecting rod 8 through a second connector 9. A short ring chain 11 is fitted at the lower end of the shackle 10. A control frame 13 for connecting an operating handle 12 is installed on the outside of the base 3. A fixed seat 14 connected to the bottom of the short ring chain 11 is movably assembled inside the control frame 13. A limit plate 15 is installed at the end of the loading and unloading arm. A limit groove 16 is formed on the limit plate 15.

[0023] We moved the main locking pin 4 from the top of the main column 1 to a position near the ground on the unloading arm. This allows personnel to easily see if the locking pin 4 is in the correct position when pulling the operating handle 12 from below the main column 1, eliminating the previous blind spot. Furthermore, the structure was redesigned, eliminating the original single horizontal locking mechanism and replacing it with two locking pins 4 on the inner arm. The locking limit was changed to a closed elliptical limit groove 16, ensuring reliable locking of both the horizontal and inner arms of the unloading arm while maintaining the original locking stability.

[0024] To accommodate the elastic compression limit, a spring 17 is installed on the outer side of the locking pin 4 inside the lateral assembly frame 2.

[0025] The lower end of spring 17 presses against the inner bottom surface of the side assembly frame 2, and the upper end of spring 17 presses against the upper limit head of locking pin 4 to control the upward elastic compression of locking pin 4.

[0026] To accommodate the bottom flip limit, a bottom limit 18 that mates with the operating handle 12 is bolted to the side wall of the base 3.

[0027] To facilitate the connection and locking, a tightening joint 19 and a connecting plate 20 located at the upper end of the tightening joint 19 are provided between the locking pin 4 and the first joint 5.

[0028] The bottom end of the locking pin 4 is connected and limited by the connecting plate 20.

[0029] To facilitate the movable assembly of the shaft, the first connector 5 and the tightening connector 19 are movably assembled via a pin.

[0030] For ease of control, the operating handle 12 includes an n-shaped flip frame 121 with its shaft mounted inside the control frame 13, an external flip arm 122 fixed to the side wall of the flip frame 121, and an extension arm 123 threadedly fitted to the outer end of the external flip arm 122.

[0031] The fixed seat 14 is connected to the inside of the flip frame 121 by a movable shaft and is movably assembled with the bottom end of the short ring chain 11.

[0032] The outer end of the external tilting arm 122 has an internally threaded blind hole for assembly. The extension arm 123 is screwed into the internally threaded blind hole via an integrally structured lead screw connector and axially fixed to the end of the external tilting arm 122. The extension arm 123 increases the length of the control mechanism, thereby making operation more labor-saving.

[0033] 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 mechanical locking structure for the inner arm of a loading / unloading arm, comprising a main column (1), a loading / unloading arm mounted on the main column (1), a lateral assembly frame (2) welded to the side wall of the main column (1), and a base (3), characterized in that: The side assembly frame (2) is equipped with two horizontally arranged locking pins (4). The lower end of the locking pin (4) is equipped with a first connecting rod (6) through a first connector (5). The lower end of the first connecting rod (6) is equipped with a second connecting rod (8) through a spiral buckle (7). The lower end of the second connecting rod (8) is equipped with a shackle (10) through a second connector (9). The lower end of the shackle (10) is fitted with a short ring chain (11). The outer side of the base (3) is equipped with a control frame (13) for connecting the operating handle (12). The control frame (13) is movably equipped with a fixed seat (14) connected to the bottom of the short ring chain (11). The loading and unloading arm is equipped with a limit plate (15). The limit plate (15) has a limit groove (16).

2. The mechanical locking structure for the inner arm of the loading and unloading arm according to claim 1, characterized in that: The locking pin (4) is located on the outside of the side assembly frame (2) and a spring (17) is installed inside.

3. The mechanical locking structure for the inner arm of the loading and unloading arm according to claim 1, characterized in that: The base (3) has a bottom limiter (18) bolted to its side wall to cooperate with the operating handle (12).

4. The mechanical locking structure for the inner arm of the loading and unloading arm according to claim 1, characterized in that: A tightening joint (19) and a connecting plate (20) located at the upper end of the tightening joint (19) are provided between the locking pin (4) and the first joint (5).

5. A mechanical locking structure suitable for the inner arm of a loading / unloading arm according to claim 4, characterized in that: The first connector (5) and the tightening connector (19) are movably assembled by a pin.

6. The mechanical locking structure for the inner arm of the loading and unloading arm according to claim 1, characterized in that: The operating handle (12) includes an n-shaped flip frame (121) with its shaft mounted inside the control frame (13), an external flip arm (122) fixed to the side wall of the flip frame (121), and an extension arm (123) threaded to the outer end of the external flip arm (122).

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