A rudder stock bushing frozen hoisting structure

Abstract

The rudder rod bushing freezing hoisting structure is convenient to hoist and place the rudder rod bushing into the liquid nitrogen tank, is favorable for improving the installation efficiency of the rudder rod bushing, and can effectively prevent the occurrence of the freezing injury condition and the rudder rod bushing falling-off injury condition.

Description

Technical Field

[0001] This utility model belongs to the field of ship rudder stock bushing installation. Specifically, this utility model relates to a refrigerated hoisting structure for rudder stock bushings. Background Technology

[0002] The ship's steering system is a course control device that enables maneuvering such as turning, maneuvering, and straight-line navigation. It is an important piece of equipment for ship navigation and mainly consists of rudder stock bearings (upper and lower rudder stock bearings), rudder pin bearings, rudder handle, rudder stock, rudder blades, and rudder pins. The rudder stock bushing is an important component of the ship's steering system, installed at the mating points between the rudder stock and rudder bearings or other related components, serving functions such as support, friction reduction, and positioning. The installation of the rudder stock bushing after freezing is an interference fit installation method that utilizes the principle of thermal expansion and contraction. The core is to use the low temperature to cause the bushing to shrink, reducing its outer diameter, thus easily inserting it into the mounting hole. After returning to room temperature, the bushing expands, forming a tight fit with the hole wall. This method is suitable for scenarios where the interference fit between the rudder stock bushing and the mounting hole is large, and the press-fit method is difficult to operate. Usually, the rudder stock bushing is completely immersed in liquid nitrogen. To avoid the low temperature from causing harm to the workers, lifting tools and clamps are usually used to place the rudder stock bushing into the liquid nitrogen tank. However, in existing technologies, the lifting tools and clamps are prone to detaching from the rudder stock bushing.

[0003] To address the aforementioned issues, patent document application number 2016205684670 discloses a liquid nitrogen cooling tank for mounting a rudder stock bushing. This liquid nitrogen cooling tank includes a base plate, a tank body, and a lid. The lid is located on top of the tank body. The tank body includes an inner liner and a tank body insulation layer. Elbow plates are provided around the tank body. The lid is provided with liquid nitrogen filling holes and liquid nitrogen evaporation holes, but this does not solve the aforementioned problems.

[0004] Therefore, in order to improve or solve at least one of the above problems, a rudder stock bushing cryogenic hoisting structure is provided that can firmly fix the rudder stock bushing, facilitate the hoisting of the rudder stock bushing into the liquid nitrogen tank, improve the installation efficiency of the rudder stock bushing, and effectively prevent frostbite and injury from rudder stock bushing falling off. Summary of the Invention

[0005] This utility model is designed to solve the aforementioned problems. Its purpose is to provide a rudder stock bushing cryogenic hoisting structure that can firmly fix the rudder stock bushing, facilitate the hoisting of the rudder stock bushing into a liquid nitrogen tank, improve the efficiency of rudder stock bushing installation, and effectively prevent frostbite and injury from rudder stock bushing detachment. To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a refrigerated hoisting structure for a rudder stock bushing, characterized by including a support rod and a fixing unit mounted on the support rod, with a hoisting assembly connected to the end of the support rod, and the rudder stock bushing mounted on the fixing unit.

[0006] The rudder stock bushing refrigerated hoisting structure provided by this utility model may also have the following features: the fixing unit includes a support plate and a cover plate, the support plate is disposed on the support rod and located below the rudder stock bushing, and the cover plate is disposed on the support rod and located above the rudder stock bushing.

[0007] The rudder bushing refrigeration hoisting structure provided by this utility model may also have the following features: the two ends of the support rod are respectively provided with a first threaded section and a second threaded section; the support plate is provided with a first connecting hole, through which the first threaded section passes; and the cover plate is provided with a second connecting hole, through which the second threaded section passes.

[0008] The rudder bushing refrigeration hoisting structure provided by this utility model may also have the following features: the fixing unit further includes a first fixing nut, which is screwed onto the first threaded section and located on the upper and lower sides of the support plate respectively; the fixing unit further includes a second fixing nut, which is screwed onto the second threaded section and located above the cover plate.

[0009] The rudder bushing refrigerated hoisting structure provided by this utility model may also have the following features: a supporting flange is provided on the support plate, and the supporting flange abuts against the edge of the rudder bushing; a pressing flange is provided on the cover plate, and the pressing flange abuts against the edge of the rudder bushing.

[0010] The rudder bushing refrigeration hoisting structure provided by this utility model may also have the following features: a first liquid inlet hole is provided on the support plate; and a second liquid inlet hole is provided on the cover plate.

[0011] The rudder bushing refrigerated hoisting structure provided by this utility model may also have the following feature: the hoisting assembly includes a connecting sleeve and a lifting eye screw, the connecting sleeve is screwed onto the second threaded section, and the lifting eye screw is screwed into the connecting sleeve.

[0012] The technical advantages of this utility model are as follows: The rudder stock bushing cryogenic hoisting structure provided by this utility model includes a support rod and a fixing unit set on the support rod. The end of the support rod is connected to a hoisting assembly. The rudder stock bushing is set on the fixing unit, which can firmly fix the rudder stock bushing. The hoisting assembly is connected to the lifting device of a crane or gantry crane, thereby facilitating the hoisting of the rudder stock bushing into the liquid nitrogen tank. This helps to improve the installation efficiency of the rudder stock bushing and can effectively prevent frostbite and injury caused by the rudder stock bushing falling off. Attached Figure Description

[0013] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram of the rudder stock bushing refrigeration hoisting structure in an embodiment of this utility model; Figure 2This is a schematic diagram of the support plate in the front view direction in an embodiment of this utility model; Figure 3 This is a schematic diagram of the support plate in the top view of an embodiment of this utility model; Figure 4 This is a schematic diagram of the cover plate in the front view direction in an embodiment of this utility model; Figure 5 This is a schematic diagram of the cover plate in the top view of an embodiment of this utility model; Figure 6 This is a schematic diagram of the support rod in an embodiment of this utility model; Figure 7 yes Figure 1 A magnified view of part A in the middle; Figure 8 yes Figure 1 A magnified view of part B in the middle section.

[0014] The components are marked as follows: rudder bushing-1, first threaded section-11, second threaded section-12, support rod-10, fixing unit-20, support plate-21, first connecting hole-211, supporting flange-212, first liquid inlet-213, cover plate-22, second connecting hole-221, clamping flange-222, second liquid inlet-223, first fixing nut-23, second fixing nut-24, lifting assembly-30, connecting sleeve-31, and lifting eye screw-32. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0016] Figure 1 This is a schematic diagram of the rudder stock bushing refrigeration hoisting structure in an embodiment of this utility model.

[0017] like Figure 1 As shown, the rudder stock bushing cryogenic hoisting structure provided by this utility model includes a support rod 10 and a fixing unit 20 disposed on the support rod 10. The end of the support rod 10 is connected to a hoisting assembly 30. The rudder stock bushing 1 is hollow cylindrical and is disposed on the fixing unit 20. The fixing unit 20 can firmly fix the rudder stock bushing 1. The hoisting assembly 30 is connected to the hoisting device of a crane or gantry crane, thereby facilitating the hoisting of the rudder stock bushing 1 into the liquid nitrogen tank. This improves the installation efficiency of the rudder stock bushing 1 and effectively prevents frostbite and injury from the rudder stock bushing 1 falling off.

[0018] Figure 2This is a schematic diagram of the support plate in the front view direction in an embodiment of this utility model; Figure 3 This is a schematic diagram of the support plate in the top view of an embodiment of this utility model; Figure 4 This is a schematic diagram of the cover plate in the front view direction in an embodiment of this utility model; Figure 5 This is a schematic diagram of the cover plate in a top view of an embodiment of this utility model. like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the fixing unit 20 includes a support plate 21 and a cover plate 22. The support plate 21 is mounted on the support rod 10 and is in the shape of a disc that fits the rudder bushing 1, located below the rudder bushing 1. The cover plate 22 is mounted on the support rod 10 and is in the shape of a disc that fits the rudder bushing 1, located above the rudder bushing 1.

[0019] Figure 6 This is a schematic diagram of the support rod in an embodiment of this utility model; Figure 7 yes Figure 1 A magnified view of part A in the middle; Figure 8 yes Figure 1 A magnified view of part B in the middle section.

[0020] like Figure 6 , Figure 7 as well as Figure 8 As shown, the support rod 10 has a first threaded section 11 and a second threaded section 12 at both ends. The support plate 21 has a first connecting hole 211 through which the first threaded section 11 passes. The fixing unit 20 also includes a first fixing nut 23, which is screwed onto the first threaded section 11. The two first fixing nuts 23 are located on the upper and lower sides of the support plate 21, respectively. Tightening the first fixing nuts 23 connects the support rod 10 and the support plate 21, firmly installing the support plate 21 onto the support rod 10 and providing stable support. The rudder stock bushing 1 has a second connecting hole 221 on the cover plate 22, through which the second threaded section 12 passes. The fixing unit 20 also includes a second fixing nut 24, which is screwed onto the second threaded section 12. The second fixing nut 24 is located above the cover plate 22, thereby pressing the cover plate 22 onto the rudder stock bushing 1. This achieves the fixing of the rudder stock bushing 1, improves the stability of the rudder stock bushing 1 during low-temperature freezing and subsequent installation, and effectively prevents frostbite and injury from the rudder stock bushing 1 falling off.

[0021] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the support plate 21 is provided with a support flange 212, which is stepped and evenly distributed on the edge of the support plate 21. The support flange 212 abuts against the edge of the rudder bushing 1, reducing the contact area between the support plate 21 and the rudder bushing 1. The cover plate 22 is provided with a pressing flange 222, which is stepped and evenly distributed on the edge of the cover plate 22. The pressing flange 222 abuts against the edge of the rudder bushing 1, reducing the contact area between the cover plate 22 and the rudder bushing 1. By setting the support flange 212 and the pressing flange 222, the loss of cold energy transfer can be reduced, and the cold energy can be concentrated on the rudder bushing 1 itself, ensuring that the rudder bushing 1 can quickly and evenly reach the target freezing temperature.

[0022] The support plate 21 is provided with a first liquid inlet hole 213, which is evenly distributed on the support plate 21. The cover plate 22 is provided with a second liquid inlet hole 223, which is evenly distributed on the cover plate 22. Through the first liquid inlet hole 213 and the second liquid inlet hole 223, liquid nitrogen can quickly enter between the support plate 21 and the cover plate 22. The liquid nitrogen can quickly contact the inner wall of the rudder bushing 1, so that the liquid nitrogen and the rudder bushing 1 are in uniform contact, further ensuring that the rudder bushing 1 can quickly and uniformly reach the target freezing temperature.

[0023] The lifting assembly 30 includes a connecting sleeve 31 and an eye bolt 32. The connecting sleeve 31 has an internal thread and is screwed onto the second threaded section 12. The eye bolt 32 is screwed into the connecting sleeve 31, which allows for easy disassembly and assembly of the connecting sleeve 31 and the eye bolt 32.

[0024] When the rudder stock bushing 1 is cryogenically frozen using the rudder stock bushing cryogenic hoisting structure provided by this utility model, the support rod 10 and the support plate 21 are connected by the first fixing nut 23. The rudder stock bushing 1 is placed on the support plate 21, with the support rod 10 and the rudder stock bushing 1 overlapping axially at their centers, so that the bottom edge of the rudder stock bushing 1 abuts against the support flange 212. The second connecting hole 221 on the cover plate 22 is passed through the support rod 10, and the cover plate 22 is placed above the rudder stock bushing 1. The upper edge of the rudder stock bushing 1 abuts against the clamping flange 222. The second fixing nut 24 is tightened, pressing the cover plate 22 onto the rudder stock bushing 1. The connecting sleeve 31 is screwed onto the second threaded section 12, and the eye bolt 32 is screwed onto the connecting sleeve 31. The lifting device of the crane or gantry is connected to the eye bolt 32, thereby lifting the rudder stock bushing 1 and transferring it into the liquid nitrogen tank. The lifting device and eye bolt 32 are removed, and the liquid nitrogen tank is sealed. The rudder stock bushing 1 is then frozen in the liquid nitrogen tank. After freezing, the eye bolt 32 is installed and the lifting device is connected for easy removal of the rudder stock bushing 1. During the installation of the rudder stock bushing 1, the rudder stock bushing 1 and the fixing unit 20 can be quickly separated by disassembling the first fixing nut 23 and the second fixing nut 24, preventing the rudder stock bushing 1 from heating and expanding during installation, thus improving the installation efficiency of the rudder stock bushing 1. Meanwhile, the support rod 10, the support plate 21 and the cover plate 22 are all made of austenitic stainless steel or other low-temperature resistant materials. They have excellent toughness at low temperatures and do not become brittle. They also have corrosion resistance, which improves the reliability of the structure and can further prevent frostbite and injury from the rudder bushing 1 falling off.

[0025] The rudder stock bushing cryogenic hoisting structure provided by this utility model includes a support rod 10 and a fixing unit 20 disposed on the support rod 10. The end of the support rod 10 is connected to a hoisting assembly 30. The rudder stock bushing 1 is hollow cylindrical and is disposed on the fixing unit 20. The fixing unit 20 can firmly fix the rudder stock bushing 1. The hoisting assembly 30 is connected to the hoisting device of a crane or gantry crane, thereby facilitating the hoisting of the rudder stock bushing 1 into the liquid nitrogen tank. This improves the installation efficiency of the rudder stock bushing 1 and effectively prevents frostbite and injury from the rudder stock bushing 1 falling off.

[0026] When the rudder stock bushing 1 is cryogenically frozen using the rudder stock bushing cryogenic hoisting structure provided by this utility model, the support rod 10 and the support plate 21 are connected by the first fixing nut 23. The rudder stock bushing 1 is placed on the support plate 21, with the support rod 10 and the rudder stock bushing 1 overlapping axially at their centers, so that the bottom edge of the rudder stock bushing 1 abuts against the support flange 212. The second connecting hole 221 on the cover plate 22 is passed through the support rod 10, and the cover plate 22 is placed above the rudder stock bushing 1. The upper edge of the rudder stock bushing 1 abuts against the clamping flange 222. The second fixing nut 24 is tightened, pressing the cover plate 22 onto the rudder stock bushing 1. The connecting sleeve 31 is screwed onto the second threaded section 12, and the eye bolt 32 is screwed onto the connecting sleeve 31. The lifting device of the crane or gantry is connected to the eye bolt 32, thereby lifting the rudder stock bushing 1 and transferring it into the liquid nitrogen tank. The lifting device and eye bolt 32 are removed, and the liquid nitrogen tank is sealed. The rudder stock bushing 1 is then frozen in the liquid nitrogen tank. After freezing, the eye bolt 32 is installed and the lifting device is connected for easy removal of the rudder stock bushing 1. During the installation of the rudder stock bushing 1, the rudder stock bushing 1 and the fixing unit 20 can be quickly separated by disassembling the first fixing nut 23 and the second fixing nut 24, preventing the rudder stock bushing 1 from heating and expanding during installation, thus improving the installation efficiency of the rudder stock bushing 1. Meanwhile, the support rod 10, the support plate 21 and the cover plate 22 are all made of austenitic stainless steel or other low-temperature resistant materials. They have excellent toughness at low temperatures and do not become brittle. They also have corrosion resistance, which improves the reliability of the structure and can further prevent frostbite and injury from the rudder bushing 1 falling off.

[0027] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A refrigerated hoisting structure for a rudder stock bushing, characterized in that, It includes a support rod (10) and a fixing unit (20) disposed on the support rod (10). The end of the support rod (10) is connected to a hoisting assembly (30), and the rudder bushing (1) is disposed on the fixing unit (20).

2. The rudder stock bushing refrigerated hoisting structure according to claim 1, characterized in that, The fixing unit (20) includes a support plate (21) and a cover plate (22). The support plate (21) is disposed on the support rod (10) and located below the rudder bushing (1). The cover plate (22) is disposed on the support rod (10) and located above the rudder bushing (1).

3. The rudder stock bushing refrigerated hoisting structure according to claim 2, characterized in that, The support rod (10) has a first threaded section (11) and a second threaded section (12) at both ends. The support plate (21) has a first connecting hole (211) through which the first threaded section (11) passes. The cover plate (22) has a second connecting hole (221) through which the second threaded section (12) passes.

4. The rudder stock bushing refrigerated hoisting structure according to claim 3, characterized in that, The fixing unit (20) further includes a first fixing nut (23), which is screwed onto the first threaded section (11) and located on the upper and lower sides of the support plate (21); the fixing unit (20) further includes a second fixing nut (24), which is screwed onto the second threaded section (12) and located above the cover plate (22).

5. The rudder stock bushing refrigerated hoisting structure according to claim 2, characterized in that, The support plate (21) is provided with a support flange (212), which abuts against the edge of the rudder bushing (1); the cover plate (22) is provided with a pressing flange (222), which abuts against the edge of the rudder bushing (1).

6. The rudder stock bushing refrigerated hoisting structure according to claim 5, characterized in that, The support plate (21) is provided with a first liquid inlet hole (213); the cover plate (22) is provided with a second liquid inlet hole (223).

7. The rudder stock bushing refrigerated hoisting structure according to claim 3, characterized in that, The hoisting assembly (30) includes a connecting sleeve (31) and an eye bolt (32), the connecting sleeve (31) being screwed onto the second threaded section (12), and the eye bolt (32) being screwed into the connecting sleeve (31).

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