Staged installation method for ship side thrust subsections

Abstract

The invention discloses a staged installation method for ship side thruster sections, and relates to the technical field of ship manufacturing and installation, which comprises the following steps: a) a preparation stage: according to technical files provided by a side thruster manufacturer, carrying out integrity check on a side thruster and related systems thereof, and making upper, lower, left and right marks at two ends of a side thruster barrel; b) a wire pulling stage: taking a ship body rib position and a base line as references, and pulling a steel wire on the side thrust subsection for positioning a flow guide pipe and a side thrust cylinder; the method comprises the following steps of (1) installing a flow guide pipe, (2) installing a side thruster cylinder, (3) installing a flow guide pipe, (4) installing a side thruster cylinder, (5) installing a side thruster motor, and (6) installing a gravity oil tank and a hand pump.According to the method, the technical problem that in the prior art, when side thrusters of ships are installed in a segmented mode, operation is complex is solved, and the installation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ship manufacturing and installation, and in particular to a staged installation method of ship thruster segments. Background Art

[0002] The installation of the thruster system is a critical step in the shipbuilding process.

[0003] The thruster system is mainly composed of thruster cylinder, motor, transmission device and propeller, etc. Its function is to provide the necessary lateral thrust to assist the ship to maneuver flexibly in narrow waterways, ports or complex waters. The traditional thruster segment installation method has certain operational complexity. Specifically, after the thruster cylinder is welded, it usually needs to be protected and the subsequent installation steps will not be carried out temporarily. The motor installation work will not be carried out until the thruster segment is driven into the dock and integrated with the whole ship.

[0004] However, the inventors found that the above installation steps have many inconveniences during the actual implementation. First, since the thruster motor can only be installed in the later stage of the ship construction, the installation period is extended, which is not conducive to improving production efficiency. Second, the motor is installed after the thruster segment is integrated with the whole ship, which requires additional positioning and adjustment work, increasing the difficulty and complexity of the installation. Summary of the invention

[0005] The embodiment of the present application solves the technical problem of complex operation during installation of ship thruster segments in the prior art by providing a staged installation method of ship thruster segments.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution, a staged installation method of a ship thruster segment, which comprises the following steps: a) Preparation stage: According to the technical documents provided by the thruster manufacturer, the integrity of the thruster and its related systems shall be checked, and the upper, lower, left and right marks shall be made on both ends of the thruster cylinder; b) Wire pulling stage: Based on the hull rib position and baseline, steel wires are pulled on the thruster sections to position the guide tube and thruster cylinder; c) Positioning and installation stage: Positioning and installation of the guide pipe and thrust cylinder; d) Welding stage: welding the thruster cylinder to the hull; e) Install the thrust motor; f) Install gravity oil tank and hand pump.

[0007] As a further improvement of the above scheme, in the preparation stage, after the two ends of the thrust cylinder are marked up, down, left and right, the following operations need to be performed: (1) Pre-mark the centering reference symbols on both end surfaces of the thrust cylinder to serve as the installation reference for the guide tube; (2) Wrap the propeller blades, elastic coupling, and motor base with three-proof cloth to protect them from collision or damage caused by welding sparks during installation; (3) The height of the hull baseline is pre-set on the inner wall of the anti-missile dock and on the benchmarks next to the block manufacturing to serve as the basis for the positioning reference of the wire.

[0008] As a further improvement of the above scheme, during the wire-pulling stage, a riveter needs to draw a parallel line to the hull rib position on the ground at a specific rib position of the bow. This parallel line is perpendicular to the centerline of the hull. Using the benchmark beside the thruster section manufacturing as a reference, a height of 2400mm is reversed at the bow, and this height is transferred to each reinforcing rib plate of the thruster section for marking.

[0009] As a further improvement of the above solution, during the positioning and installation stage, the guide tube needs to be positioned and fixed based on the pulled steel wire; and the side thrust cylinder is positioned and welded based on the center of the guide tube.

[0010] As a further improvement of the above solution, after the guide tube and the side thrust cylinder are positioned, the two ends of the side thrust cylinder and the guide tube are sealed and welded with code plates.

[0011] As a further improvement of the above scheme, during the welding stage, the thrust cylinder and the guide tube are welded symmetrically and in sections, and the length of one welding is in the range of 400 to 500 mm. During the welding process, the gap between the thrust cylinder wall and the blade tip is checked at any time, and the gap is maintained between 39 mm and 80 mm.

[0012] As a further improvement of the above solution, the accessories on the thrust cylinder are removed before the welding stage and then installed and restored after the welding is completed.

[0013] As a further improvement of the above solution, during the installation of the side thrust motor, first ensure that the side thrust motor base and the surface of the elastic coupling are clean, and then install the elastic coupling.

[0014] As a further improvement of the above solution, when installing the elastic coupling, the inside of the elastic coupling should be filled with grease, and the outer shell of the elastic coupling should be installed according to the matching mark.

[0015] As a further improvement of the above solution, the distance from the installation height of the gravity oil tank to the center of the propeller input shaft is between 15m and 16.2m.

[0016] It can be seen from the above technical solutions that the present invention has at least the following technical effects or advantages: The present invention uses the guide tube and the thruster cylinder as the reference for welding and aligning the thruster motor, so that the overall installation of the thruster system can be completed in the stage of segmented construction, without the need to drive the thruster segments into the dock and install the thruster motor after they are integrated with the whole ship. This installation method optimizes the installation process, improves installation efficiency, and reduces operation complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work: Figure 1 It is a drawing of the wire positioning of the guide pipe in the present invention; Figure 2 is a schematic diagram of a welding node; Figure 3 This is a schematic diagram of the side thrust installation; Figure 4 Schematic diagram for aligning the thruster motor installation.

[0018] Explanation of the reference numerals: 1. flow guide tube, 2. thrust motor, 3. motor base, 4. thrust cylinder. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0020] The invention discloses a staged installation method of ship thruster segments.

[0021] Among them, the ship adopts a marine adjustable pitch type lateral thruster with a motor base, which is mainly composed of a drive motor, a step-up transformer, a pre-magnetic transformer, a starter, a machine-side control box, a hydraulic device, a gravity oil tank, an elastic coupling, a thruster body and a remote control device. The power of the prime mover is transmitted to the propeller shaft through the elastic coupling, the input shaft, and the bevel gear, so that the propeller rotates in a certain direction to generate thrust. The pressure oil is injected into the propeller hub through the electromagnetic reversing valve and the piping in the propeller shaft, pushing the crosshead piston to reciprocate. The reciprocating motion of the crosshead piston is converted into rotational motion through the slider mechanism to achieve variable pitch of the blades, thereby obtaining thrust of different sizes and directions.

[0022] In this embodiment, the ship is designed as a bow thruster, the centerline of the propeller input shaft is located at the bow FR260 rib position, 400mm from the hull centerline, and the center height of the cylinder is 2400mm from the hull baseline. The propeller device consists of a cylinder assembly, a propeller shaft assembly, a drive shaft assembly and a propeller blade.

[0023] The specific implementation steps of this method are as follows: a) Preparation stage: (1) In accordance with the technical documents provided by the thruster manufacturer, conduct an integrity check on the thruster including the prime mover, transmission device, propeller, thruster cylinder 4, electronic control system and hydraulic system to ensure that the above systems are intact and in good condition; (2) Check the length, outer roundness, clearance between the blade tip and the cylinder 4, and the structural dimensions of each part of the thrust cylinder 4, and make up-down, left-right marks at both ends of the thrust cylinder 4 for later installation; (3) Pre-mark the centering reference symbols on both end surfaces of the outer circumference of the thrust cylinder 4, and install the guide cylinder 1 for the reference centering; (4) Wrap the propeller blades, elastic couplings, motor base, etc. with three-proof cloth to protect them from collision or damage caused by welding sparks during installation; (5) Before welding the thrust cylinder 44, the toggle plates and outer plates connected to the thrust cylinder 4 should be welded and completed, and the pyrotechnic calibration and other work should be completed in advance, so as to reduce the welding deformation of the positioning dimensions during welding of the thrust cylinder 4; (6) The height of the hull baseline should be reflected in advance on the dock wall and the benchmarks next to the block manufacturing to provide a basis for the wire positioning benchmark.

[0024] b) Wire pulling stage: Since the section where the bow thruster is located is reverse-made in the workshop, the installation of the guide tube 1 needs to be pre-positioned in advance: that is, the guide tube 1 is pre-installed to the DK1A section in advance, and assembled with TT1A to form the B19C section. After the section welding is completed and inspected, the guide tube 1 is installed by pulling the wire. The specific operations are as follows: (1) At the FR260 rib of the bow, a riveter shall draw a line parallel to the hull rib on the ground. This parallel line shall be perpendicular to the hull centerline (see Figure 1 ); (2) Using the pole beside the thruster block as the reference, a height of 2400mm is measured at the bow; this height is then transferred to each stiffener plate of the thruster block and marked for easy positioning and installation; (3) Make a wire rack on both sides of the guide tube 1, one on each side, and use a steel wire with a diameter of 0.6mm to pass through the process holes on the left and right at the same time, and align the plumb line with the parallel line of the rib position on the ground, with a left and right deviation of ±1.5mm. The height is based on 2400mm above the hull baseline, and after pulling the wire, it is submitted to the shipowner for inspection.

[0025] c) Positioning and installation phase: (1) Position the two guide tubes 1 according to the stretched steel wire, and measure the distance between the inner wall of the guide tube 1 and the steel wire at multiple points. The deviation is required to be no more than 2mm. Position the guide tube 1 and fix it with spot welding. Submit to the ship owner and ship inspection; (2) Drill a process hole on the hull outer plate according to the center line of the already drawn guide tube 1, draw a cutting circle with the outer circle of the guide tube 1 as the diameter at the left and right process holes, and open the hole by gas cutting, and then weld the guide tube 1 to the hull structure. During the welding process, always check the distance between the steel wire and the inner wall of the guide tube 1; (3) Based on the centerline of the hull, cut off the excess of the guide tube 1 according to the length of the thrust cylinder 4, and ensure that the structure on the thrust cylinder 4 corresponds to the structure on the hull. This work must be completed before the section turns over; (4) When the sections are assembled (after the B19C sections are turned over), the side thrust sections are positioned and welded with the center of the guide tube 1 as the reference. It should be noted that welding on the side thrust section wall is not allowed when the side thrust sections are installed; the motor base 3 cannot be used for lifting or support. Adjust the side thrust device to ensure that the center of the side thrust section coincides with the center of the guide tube 1; (5) Use slings to pre-load large equipment such as motors into the warehouse, and then align and position them after the main hull is closed; check the distance between the centerline of the thruster and the centerline of the hull, and the measurement data must meet the requirements of the design drawings; (6) After the thrust assembly is positioned, the two ends of the cylinder and the guide tube 1 are fixed with sealing welding using code plates; (7) Pay attention to leaving marks on both ends of the guide tube 1 for use in checking and aligning when positioning in sections.

[0026] d) Welding stage: (1) When welding the thrust cylinder 4 and the guide tube 1, try to use a welding method that minimizes the bending deformation of the inner diameter of the thrust cylinder 4 (the length of one welding is between 400 and 500 mm). During the welding process, the positioning dimensions of the cylinder and the gap between the blades and the cylinder should be measured at any time. If any deviation is found, effective measures should be taken to correct it in time. The thruster has three annular ribs and five longitudinal ribs. All ribs are welded and fixed to the hull structure at the corresponding position. In order to reduce various deformations caused by welding, it is required to adopt a segmented symmetrical welding method and implement it according to the specifications. A small current should be used during welding, and the welding should be symmetrical; (2) Precautions during welding: To avoid welding deformation due to gravity, the accessories on the thruster section should be removed before welding and then installed again after the welding is completed and inspected.

[0027] Use three-proof cloth to protect the mechanical parts inside the cylinder to avoid damage; use three-proof cloth to wrap the propeller, blades, stainless steel layer and other parts to avoid damage by electric sparks.

[0028] After the thrust cylinder 4 and the guide tube 1 are butt-jointed, the burrs of the butt weld should be polished and smoothed. Welding is strictly prohibited on the stainless steel plate of the thrust cylinder 4. The motor base 3 on the thrust cylinder 4 is prohibited from being butt-jointed with other hull structures.

[0029] During the welding process, the gap between the thrust cylinder wall and the blade tip should be checked frequently to ensure that it is between 39mm and 80mm.

[0030] e) Install the thrust motor 2: (1) Ensure that the motor base and the surface of the elastic coupling are clean; (2) The radial deviation of the elastic coupling is P ≤ 0.28 mm, and the angular deviation is XY ≤ 0.33 mm. (See Figure 4 ) When installing the coupling, fill the inside of the coupling with grease, install the coupling housing according to the matching mark, and pay attention to its non-interference with the rudder angle transmitter and piping during installation. Bolt tightening torque 73.6N·m; (3) After positioning the thrust motor 2, drill the positioning pin hole and install the positioning pin. The motor mounting bolt is M24 and the tightening torque is 492N·m.

[0031] f) Install gravity oil tank and hand pump: (1) When installing the gravity oil tank and hand pump, full consideration must be given to vibration prevention and they must be installed on a solid and reliable mounting base; (2) The distance from the installation height of the gravity oil tank to the center of the propeller input shaft is between 15m and 16.2m; (3) The hand pump can be installed at a position where the oil suction height is as low as possible (maximum height: 2.5m from the thruster centerline) according to the actual situation of the thruster tank.

[0032] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention rather than requiring the present invention to be constructed or operated in a specific position, and therefore should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense, for example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in their embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novelties disclosed herein.

Claims

1. A staged installation method for ship thruster segments, characterized in that: The following steps are involved: a) Preparation stage: According to the technical documents provided by the thruster manufacturer, the integrity of the thruster and its related systems shall be checked, and the upper, lower, left and right marks shall be made on both ends of the thruster cylinder; b) Wire pulling stage: Based on the hull rib position and baseline, steel wires are pulled on the thruster sections to position the guide tube and thruster cylinder; c) Positioning and installation stage: Positioning and installation of the guide pipe and thrust cylinder; d) Welding stage: welding the thruster cylinder to the hull; e) Install the thrust motor; f) Install gravity oil tank and hand pump.

2. A staged installation method for ship thruster segments according to claim 1, characterized in that: In the preparation stage, after marking the two ends of the thrust cylinder with the upper, lower, left and right marks, the following operations are required: (1) Pre-mark the centering reference symbols on both end surfaces of the thrust cylinder to serve as the installation reference for the guide tube; (2) Wrap the propeller blades, elastic coupling, and motor base with three-proof cloth to protect them from collision or damage caused by welding sparks during installation; (3) The height of the hull baseline is pre-set on the inner wall of the anti-missile dock and on the benchmarks next to the block manufacturing to serve as the basis for the positioning reference of the wire.

3. A staged installation method for ship thruster segments according to claim 1, characterized in that: During the wire-pulling stage, the riveters need to draw a parallel line to the hull ribs on the ground at a specific rib position of the bow. This parallel line is perpendicular to the centerline of the hull. Using the benchmark beside the thruster section manufacturing as a reference, a height of 2400mm is drawn at the bow, and this height is transferred to each reinforcing rib plate of the thruster section for marking.

4. A staged installation method for ship thruster segments according to claim 1, characterized in that: During the positioning and installation stage, the guide tube needs to be positioned and fixed according to the pulled steel wire; the side thrust cylinder is positioned and welded based on the center of the guide tube.

5. A staged installation method for ship thruster segments according to claim 1, characterized in that: After the guide tube and the side thrust cylinder are positioned, the two ends of the side thrust cylinder and the guide tube are sealed and welded with code plates.

6. A method for installing ship thruster segments in stages according to claim 1, characterized in that: During the welding stage, the thrust cylinder and the guide tube are welded symmetrically and in sections, with the length of one welding ranging from 400 to 500 mm. During the welding process, the gap between the thrust cylinder wall and the blade tip is checked at any time and maintained between 39 mm and 80 mm.

7. A method for installing ship thruster segments in stages according to claim 1, characterized in that: Before welding, remove the accessories on the thrust cylinder and install them again after welding is completed.

8. A method for installing ship thruster segments in stages according to claim 1, characterized in that: When installing the thrust motor, first ensure that the thrust motor base and the surface of the elastic coupling are clean, and then install the elastic coupling.

9. A method for installing ship thruster segments in stages according to claim 1, characterized in that: When installing the elastic coupling, the inside of the elastic coupling should be filled with grease and the outer shell of the elastic coupling should be installed according to the matching mark.

10. A method for installing ship thruster segments in stages according to claim 1, characterized in that: The installation height of the gravity oil tank is between 15m and 16.2m to the center of the propeller input shaft.

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