Strip-shaped steel-copper composite material oil pipe supporting and welding structure of controllable-pitch propeller

Abstract

The strip-shaped steel-copper composite material oil pipe supporting and welding structure of the controllable-pitch propeller comprises an outer oil pipe and four supporting strips, the four supporting strips are symmetrically distributed on the outer oil pipe, the outer oil pipe is made of steel materials, and the supporting strips are made of steel-copper composite materials. And the four supporting strips are symmetrically welded with the outer oil pipe through TIG. According to the welding structure for the inner oil pipe and the outer oil pipe of the controllable-pitch propeller shaft, the steel-copper composite material supporting strips are symmetrically distributed for welding construction, the welding stability and the welding quality can be effectively improved, and the service life of the outer oil pipe is prolonged. On one hand, the advantages and characteristics of the steel-copper composite material are fully utilized (the copper alloy support is safer when moving and contacting with the steel lining or the shaft inner hole; the welding of the steel support and the oil pipe body avoids various problems caused by dissimilar metal welding; and on the other hand, automatic or semi-automatic TIG welding symmetrical welding is adopted, and compared with traditional manual argon arc welding, the welding stability is improved, and the welding heat input amount is reduced.

Description

Technical Field

[0001] The utility model relates to a tubing support and welding structure for a controllable pitch propeller, in particular to a welding structure that uses strip-shaped tubing supports made of steel-copper composite materials and is symmetrically distributed for welding. Background Art

[0002] As an essential vehicle in ocean resource development, ships are not only used to transport materials but also play an important role in the field of national defense science and technology. With the continuous expansion of the scope of ocean resource development and increasingly fierce international competition, ships are playing an increasingly important role in ocean resource development.

[0003] A controllable pitch propeller (hereinafter referred to as a controllable pitch propeller) is a special propulsion device for ships. Its propeller blades can rotate relative to the propeller hub to achieve the adjustment of the propeller blade pitch. The controllable pitch propeller system usually consists of six parts: propeller blades, propeller hub, inboard tubing, oil distributor, hydraulic system, and electric control system. The connections between various parts mainly rely on physical structures such as mechanical and electrical structures. As Figure 1 shown, 1 is the inboard tubing, 2 is the outboard tubing, 3 is the ship's transmission shaft, 4 is the shaft lining sleeve, and 5 is the outboard tubing support strip. The transmission shaft is a hollow structure. The outboard tubing contacts the shaft lining sleeve or the inner hole installed in the transmission shaft through strip-shaped supports welded to it, thereby realizing the support of the outboard tubing inside the transmission shaft. The inboard tubing and the outboard tubing are responsible for transmitting the high-pressure oil from the hydraulic system to the ahead cavity or astern cavity of the propeller hub. The oil pressure is used to drive the piston to move linearly in the oil cavity, and the piston drives the slider to drive the crankpin disk to rotate circumferentially. Finally, the linear motion of the piston is converted into the rotation of the propeller blade, thereby realizing the adjustment of the pitch.

[0004] Currently, tubing supports (aluminum bronze or steel materials) are usually welded to the outboard tubing by manual argon arc welding to cooperate with the inner hole or inner hole lining sleeve of the shaft. Since the welding process will inevitably have a certain impact on the welding area, it has become a weak link of the inboard tubing. Once fatigue fracture occurs, it will cause the failure of the controllable pitch propeller device. Therefore, it is necessary to effectively improve the stability and quality of welding. Summary of the Invention

[0005] The purpose of the utility model is to provide a strip-shaped steel-copper composite material tubing support and welding structure for a controllable pitch propeller, which can effectively improve the stability and quality of welding, enhance the reliability of the outboard tubing during operation, and extend the service life of the outboard tubing.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is: a strip-shaped steel-copper composite material tubing support and welding structure for a controllable pitch propeller, including an outboard tubing and support strips. Four support strips are symmetrically distributed on the outboard tubing. The material of the outboard tubing is steel, and the material of the support strips is steel-copper composite material; and the four support strips are symmetrically TIG welded to the outboard tubing.

[0007] Furthermore, a short weld edge is adopted between the support bar and the radial direction of the outer oil pipe, and a long weld edge is adopted between the support bar and the axial direction of the outer oil pipe.

[0008] Furthermore, the support bar includes a steel support and a copper alloy layer covering the steel support.

[0009] Furthermore, the steel support is made of steel material with the same grade as the outer oil pipe body.

[0010] Furthermore, a layer of copper alloy is covered on the steel support by surfacing or laser cladding.

[0011] Furthermore, the thickness of the copper alloy layer covering the steel support is 2 - 5 mm.

[0012] The beneficial effects of the utility model are as follows:

[0013] The utility model adopts an adjustable pitch propeller shaft inner and outer oil pipe welding structure with steel - copper composite material support bars symmetrically distributed for welding construction, which can effectively improve the welding stability and welding quality, and improve the service life of the outer oil pipe. On the one hand, the advantageous characteristics of the steel - copper composite material are fully utilized (when the copper alloy support moves in contact with the steel bushing or the inner hole of the shaft, it is safer; the steel material support is welded to the oil pipe body to avoid various problems caused by dissimilar metal welding); on the other hand, automatic or semi - automatic TIG welding is used for symmetric welding, which improves the welding stability and reduces the welding heat input compared with traditional manual argon arc welding. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the strip - shaped support structure of the oil pipe;

[0015] Figure 2 It is a schematic diagram of the strip - shaped support welding structure of the utility model;

[0016] Figure 3 It is a radial sectional view of the strip - shaped support welding structure of the utility model;

[0017] Figure 4 It is an axial sectional view of the strip - shaped support welding structure of the utility model;

[0018] Figure 5 It is a schematic diagram of the strip - shaped steel - copper composite material support bar structure of the utility model. Specific Embodiments

[0019] The following further illustrates the utility model in conjunction with the drawings and embodiments.

[0020] As Figures 2 to 5As shown in the figure, a strip-shaped steel-copper composite oil pipe support and welding structure of a controllable pitch propeller of the present utility model includes an outer oil pipe 6 and support bars 7. Four support bars 7 are symmetrically distributed on the outer oil pipe 6. The thermal strains and thermal expansions caused by heat during the welding process offset each other at various positions, reducing the residual stress after welding.

[0021] The material of the outer oil pipe 6 is steel, and the material of the support bars 7 is steel-copper composite material. The lower half of the support bar 7 (steel support 7-1) uses the same steel material as the outer oil pipe body. The weld strength of the same metal welding is higher, the welding quality is more stable, and it also avoids other problems that may be caused by the mutual penetration of elements in the heat-affected zone of the oil pipe welding during dissimilar metal welding. Specifically, a short weld edge 9 is used between the support bar 7 and the outer oil pipe 6 in the radial direction, and a long weld edge 8 is used between the support bar 7 and the outer oil pipe 6 in the axial direction.

[0022] A copper alloy layer 7-2 is covered on the steel support 7-1 of the support bar 7 by methods such as surfacing or laser cladding. It is safer when there is a displacement movement with the shaft bushing or the inner hole of the shaft during the installation of the inner oil pipe in the shaft and the controllable pitch operation, effectively improving the reliability of the oil pipe work. The strip area of the support bar 7 is small, and the copper alloy layer 7-2 completely covers it.

[0023] Preferably, the thickness of the copper alloy layer 7-2 covered on the steel support 7-1 is 2-5 mm.

[0024] During the welding process of the support bars, automatic or semi-automatic TIG welding (gas tungsten arc welding) is used in the long weld direction to improve the construction stability, and manual welding can be used for the short sides to improve the construction efficiency, and stable welding process performance and good welding joints can be obtained. Welding is carried out in a welding sequence starting from the long weld and symmetrically.

Claims

1. A strip steel-copper composite oil pipe support and welding structure for a controllable pitch propeller, characterized in that: It includes an outer oil pipe and support bars. Four support bars are symmetrically distributed on the outer oil pipe. The material of the outer oil pipe is steel, and the material of the support bars is a steel-copper composite material; and the four support bars are symmetrically TIG welded to the outer oil pipe.

2. The strip steel-copper composite oil pipe support and welding structure of the controllable pitch propeller according to claim 1, characterized in that: Short weld seams are used between the support bars and the outer oil pipe in the radial direction, and long weld seams are used between the support bars and the outer oil pipe in the axial direction.

3. The strip steel-copper composite oil pipe support and welding structure of the controllable pitch propeller according to claim 1, characterized in that: The support bar includes a steel support and a copper alloy layer covering the steel support.

4. The strip steel-copper composite oil pipe support and welding structure of the controllable pitch propeller according to claim 3, characterized in that: The steel support uses the same steel material as the grade of the outer oil pipe body.

5. The strip steel-copper composite oil pipe support and welding structure of the controllable pitch propeller according to claim 3, wherein: A layer of copper alloy layer is covered on the steel support by surfacing or laser cladding.

6. The strip steel-copper composite oil pipe support and welding structure of the controllable pitch propeller according to claim 5, characterized in that: The thickness of the copper alloy layer covering the steel support is 2 - 5 mm.

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