A rudder blade rotation angle detection method

Abstract

A rudder rotation angle detection method, the measuring device is placed at the intersection of the dock berth center line and the vertical center line of the rudder, the rotating support is positioned and fixed through the magnetic attraction device of the bow, the angle value to be measured is determined through the angle indicating line, at this time the laser is turned on, the rudder is dragged by the construction personnel in the dock by using the equipment, when the rudder rotates to the laser projection line and coincides with the bottom center line of the rudder, at this time the rudder reaches the angle value required by the rotation test, and the rudder rotation angle detection is completed. The present application is light and portable, easy to install, and the measurement precision is improved by 1 times compared with the original measurement method. The new tooling can save labor input, avoid the waste of construction materials and kinetic energy, significantly reduce and shorten the construction time, greatly reduce the construction intensity on site, ensure the construction safety of personnel, and ensure the accuracy of the rudder rotation angle.

Description

Technical Field

[0001] This invention belongs to the field of marine shipbuilding and design, and specifically relates to a method for detecting the rudder blade rotation angle. Background Technology

[0002] Before a ship's rudder system is launched, the rudder blades need to undergo a slewing test to verify their flexibility and whether the turning angle reaches the maximum design value.

[0003] In current shipbuilding techniques, the first step is to pull the rudder blade to its zero position and ensure it aligns with the centerline of the dock. Workers then need to go to the steering gear room and mark the required turning angle on the rudder stock at the connection point between the rudder stock and the rudder bearing. After this is completed, the steering gear room personnel notify the dock workers to pull the rudder blade for a left-right turning test. The steering gear room personnel observe the calculated left-right turning angle marks marked on the rudder stock. When the rudder blade reaches the marked turning angle, they use a walkie-talkie to notify the dock workers responsible for pulling the rudder blade to stop rotating it. They then check to confirm whether the mark on the rudder stock indicates the maximum turning angle has been reached. If the maximum turning angle has not been reached, they notify the dock workers to continue pulling the rudder blade, repeating this process until the maximum turning angle is achieved. Under this operating method, on-site construction efficiency is low, the time spent on pulling the rudder blade is long, kinetic energy is wasted, the coordination of multiple groups of construction personnel to pull or stop the rudder blade requires a lot of manpower, there are certain errors in the on-site measurement and calculation of the turning angle data, and the operation is cumbersome and complicated, which poses certain difficulties to construction quality and work efficiency. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for detecting the rotation angle of a rudder blade, aiming to reduce manual pulling while simultaneously measuring whether the rudder blade has reached its maximum rotation angle. The technical solution adopted is as follows:

[0005] A method for detecting the rotation angle of a rudder blade is disclosed. The method requires a rudder blade rotation angle detection device. The detection device includes a circular base, which is supported by a support adjustment rod. A bearing is located at the center of the base, and a rotating bracket is rotatably connected to the bearing. A laser emitter is located at the top of the rotating bracket.

[0006] The base is divided into two semicircular segments by its diameter. The left semicircular segment has an iron positioning ring, and the right semicircular segment has a scale. A magnetic positioning post at the bottom of the rotating bracket is attached to the iron positioning ring in the left semicircle. The right semicircle has a 0-degree mark at its center, with the mark increasing to 90° along its edge. Indicating lines are located at the bottom of the rotating bracket, symmetrically positioned with the magnetic positioning post. The magnetic positioning post is located below the front end of the laser emitter, and the indicating lines are located below the rear end of the laser emitter.

[0007] Place the rudder blade rotation angle detection device on the ground at the intersection of the dock slipway centerline and the vertical centerline of the rudder blade, and level the detection device to ensure that the base is in a horizontal state.

[0008] Initially, rotate the rotating support until the indicator line on the rotating support coincides with the zero-degree mark on the ruler. Then, turn on the laser emitter until the crosshairs of the laser emitter coincide with the center line of the dock.

[0009] When it is necessary to test the flexibility of the rudder blade at a certain angle on the port side, manually rotate the rotating bracket to the left. The laser emitter's light source will rotate along with it. Observe whether the indicator line coincides with the scale line at the same angle on the left side of the scale. When they coincide, the magnetic positioning post is attached to the positioning ring to fix the rotating bracket. Then, the dock workers use equipment to drag the rudder blade. When the center line of the bottom of the rudder blade coincides with the center line of the dock and the cross line of the laser, it is confirmed that the rudder blade has reached the angle required for the port side turning test and meets the inspection requirements.

[0010] When it is necessary to test the flexibility of the rudder blade at a certain angle on the starboard side, manually rotate the rotating bracket to the right. The laser emitter's light source will rotate along with it. Observe whether the indicator line coincides with the scale line at the same angle on the right side of the scale. When they coincide, attach the magnetic positioning post to the positioning ring and fix the rotating bracket. Then, the dock workers use equipment to drag the rudder blade. When the center line of the bottom of the rudder blade coincides with the center line of the dock and the cross line of the laser, it is confirmed that the rudder blade has reached the angle required for the port side turning test and meets the inspection requirements.

[0011] Furthermore, in the aforementioned method for detecting the rotation angle of a rudder blade, the rotating bracket has a chassis with two support frames symmetrically arranged on the chassis. The two support frames are erected vertically, and a laser fixing plate is fixed on the top of the support frame. The laser emitter passes through the center of the laser fixing plate, and four adjusting bolts are provided on one of the laser fixing plates. The four adjusting bolts are evenly spaced along the circumference of the laser emitter.

[0012] Furthermore, in the aforementioned method for detecting the rotation angle of a rudder blade, the scale division value is 1°.

[0013] Furthermore, in the aforementioned method for detecting the rotation angle of a rudder blade, a level is embedded in the upper surface of the base.

[0014] Furthermore, in the aforementioned method for detecting the rotation angle of a rudder blade, the outer surface of the support adjustment rod is provided with threads, and a base is provided at the bottom of the support adjustment rod, with a lower nut fitted thereon. The lower nut is located above the base, and its top is inserted from below the base, fitted with an upper nut, which is located below the base. By adjusting the upper nut and the lower nut, the height of the base from the ground can be adjusted.

[0015] Furthermore, in the aforementioned method for detecting the rudder blade rotation angle, the magnetic positioning post is located on the chassis.

[0016] Furthermore, in the above-mentioned method for detecting the rotation angle of a rudder blade, the specific process of leveling the detection device is as follows: observe the movement direction of the level bubble on the level instrument of the detection device, and adjust the height of the support adjustment rod according to the movement direction of the level bubble so that the level bubble is within the range of the horizontal value detected by the level instrument, ensuring that the base of the detection device is in a horizontal state.

[0017] This invention is lightweight, portable, and easy to install, and its measurement accuracy is twice that of the original method. Using the new tooling saves manpower, avoids waste of construction materials and energy, significantly reduces construction time, greatly reduces on-site construction intensity, ensures personnel safety, and guarantees the accuracy of the rudder blade rotation angle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the detection device;

[0019] Figure 2 This is a top view of the detection device.

[0020] Figure 3 This is a schematic diagram of the operation process;

[0021] Figure 4 This is a top-down view of the operation process;

[0022] Among them, 1-rotating bracket, 2-base, 3-support adjustment rod, 4-base, 5-upper nut, 6-magnetic positioning column, 7-bearing, 8-adjusting bolt, 9-laser fixing plate, 10-laser emitter, 11-level, 12-iron positioning ring, 13-scale, 14-indicating line, 15-dock and slipway center line, 16-rudder blade bottom center line, 17-rudder blade vertical center line, 18-laser crosshair, 19-rudder blade rotation angle detection device, 20-rudder blade, A-rudder blade bottom center line coincides with the laser 35° emitter crosshair, B-rudder blade bottom center line coincides with the laser 0° emitter crosshair. Detailed Implementation

[0023] The present invention will be described in detail with reference to specific embodiments.

[0024] like Figure 1 and 2The illustrated method for detecting the rudder blade rotation angle includes a circular base 2 for the rudder blade rotation angle detection device 19, which primarily functions as a reference platform for angle detection. A semi-circular iron positioning ring 12 is embedded in the front end of the upper surface of the circular base, primarily functioning to enable the magnetic device to adhere to the surface for positioning. A scale 13 has graduations distributed at 90-degree intervals to the left and right of the center of the circular base at the rear end of the upper surface, achieving a measurement accuracy of 1 degree, primarily functioning to read the angle value to be measured. A level 11 is embedded in the upper surface of the circular base, primarily functioning to observe the levelness of the angle detection reference platform. A support adjustment rod 3 is threaded to the bottom of the base, primarily functioning to adjust the levelness of the detection reference platform by rotating the rod. A base 4 is connected to the support adjustment rod via an internal thread, primarily functioning to provide stable support for the entire device on the ground. A locking nut 5 is connected to the support adjustment rod via an internal thread, primarily functioning to fix the levelness of the reference platform after adjustment by the support adjustment rod, preventing height displacement. Bearing 7 is embedded in the center of the upper surface of the base and connected to the rotating bracket. Its main function is to rotate around the center. The rotating bracket 1 is embedded in the center of the base via the bearing. Its main function is to drive the measuring tool on the rotating bracket to rotate. Indicator scale 14 is located at the rear of the rotating bracket and works in conjunction with the semi-circular scale on the fixed bracket. Its main function is to identify the rotation angle of the rotating bracket through the angle pointer scale. Magnetic positioning post 6 is embedded at the front end of the rotating bracket and is magnetically attracted to the upper surface of the iron angle positioning ring. Its main function is to position the angle of the angle bracket. Adjusting bolts 8 are installed at the upper front end of the rotating bracket. Their main function is to adjust the initial positioning position of the laser using four radial adjustment bolts. The laser fixing plate 9 is circular with a central hole. The central hole of the fixing plate is used to fix the tail end of the laser, and bolts are used to connect it to the rotating bracket body through three bolt holes on the fixing plate. Its main function is to facilitate the fixing and disassembly of the laser. The laser emitter 10 has its head installed in the radial adjuster and its tail embedded in the central hole of the fixing plate. Its main function is to emit laser rays to detect the angle data of the measured object.

[0025] like Figure 3 , 4As shown, when operating the device and detection method of the present invention, first place the rudder blade rotation angle detection device 19 on the ground at the intersection of the dock slipway centerline 15 and the vertical centerline of the rudder blade. Observe the movement direction of the level bubble on the level instrument 11 on the base 2. According to the detected movement direction of the level bubble, adjust the height of the corresponding support adjustment rod 3 at the bottom of the base 2 so that the level bubble is within the horizontal value range detected by the level instrument. At this time, the base 2 reaches a horizontal state. Tighten the locking nuts 5 on the three support adjustment rods with a wrench to confirm that the base 2 is in a horizontal state again. Rotate the rotating bracket 1 so that the indicator line 14 on the rotating bracket coincides with the zero degree line of the scale 13. Then turn on the laser emitter 10 and use the adjusting bolt 8 to make the laser crosshair coincide with the dock slipway centerline. The centerline of the bottom of the rudder blade coincides with the laser 0° emitter crosshair. Figure 4 As shown in Figure B, for example, during construction, it is necessary to test the rudder blade flexibility at a 35-degree angle on the port side. At this time, the rotating support 1 is manually rotated to the left, and the laser emission source on the angle detection support rotates accordingly. It is observed whether the angle indicator mark 14 at the stern of the angle detection support coincides with the 35-degree mark on the left side of the scale 13 on the base surface. If they coincide, it can be confirmed that the angle detection support and laser emitter have rotated to the left to a 35-degree angle. At this time, the magnetic positioning post 6 at the bow of the angle detection support uses magnetic principle to adhere to the upper surface of the iron positioning ring 12, thus fixing the rotating support and positioning it at a 35-degree angle on the port side. Subsequently, the dock workers use equipment to drag the rudder blade 20. When the rudder blade rotates to the left until the center line at the bottom of the rudder blade coincides with the 35° emission crosshair of the laser, it can be confirmed that the rudder blade has reached the 35-degree angle required for the port side turning test and meets the inspection requirements. To test the rudder blade's flexibility at a 35-degree angle on the starboard side, manually rotate the rotating bracket 1 on the rudder blade rotation angle testing device 19 to the right. The laser emission source on the angle testing bracket will rotate accordingly. Observe whether the angle indicator line 14 at the stern of the angle testing bracket coincides with the 35-degree graduation line on the right side of the scale 13 on the base surface. If they coincide, it can be confirmed that the angle testing bracket and laser emitter have rotated to the right to a 35-degree angle. At this time, the magnetic positioning column 6 at the bow of the angle testing bracket is magnetically attached to the upper surface of the iron positioning ring 12, thus fixing the rotating bracket at a 35-degree angle on the starboard side. Subsequently, dock workers use equipment to drag the rudder blade. When the rudder blade rotates to the right until the center line at the bottom of the rudder blade coincides with the crosshairs of the 35° laser emitter, it can be confirmed that the rudder blade has reached the 35-degree angle required for the starboard rotation test and meets the inspection requirements. The above operation method can complete the rudder blade rotation angle flexibility test.

Claims

1. A rudder blade rotation angle detection method, characterized by, The detection method needs to use the rudder blade rotation angle detection device (19), the detection device includes a circular base (2), the base is supported by a support adjusting rod (3) below, the center of the base is provided with a bearing (7), the rotating support (1) is connected by the bearing, the rotating support top is provided with a laser emitter (10); The base is divided into left and right two semicircular segments by diameter, the left semicircular segment is provided with an iron positioning ring (12), and the right semicircular segment is provided with a scale (13); The magnetic positioning column (6) at the bottom of the rotating support is adsorbed on the iron positioning ring (12) of the left semicircle, and the right semicircular segment takes the center of the arc as the 0 scale line, and increases to 90° along the edge of the right semicircular segment to both sides in turn; The rotating support bottom is provided with an indicating scale line (14), the indicating scale line is symmetrically arranged with the magnetic positioning column, the magnetic positioning column is located below the front end of the laser emitter, and the indicating scale line is located below the tail end of the laser emitter; The rudder blade rotation angle detection device is placed on the ground at the intersection of the dock berth center line and the rudder blade vertical center line, the detection device is leveled, and it is ensured that the base is in a horizontal state; At the beginning, the rotating support (1) is rotated, so that the indicating scale line (14) on the rotating support coincides with the zero degree scale line of the scale (13); Then the laser emitter (10) is turned on, so that the laser emitter cross ray coincides with the dock berth center line; When it is necessary to detect the flexibility of a certain degree angle of the left side of the rudder blade, the rotating support (1) is manually rotated to the left side, the emission light source of the laser emitter is rotated together, whether the indicating scale line (14) coincides with the scale line of the same angle on the left side of the scale (13) is observed, when the indicating scale line coincides with the scale line, the magnetic positioning column (6) is adsorbed on the positioning ring (12), the rotating support is fixed, then the construction personnel in the dock use the equipment to drag the rudder blade, when the bottom center line of the rudder blade coincides with the dock berth center line and the laser cross line, it is confirmed that the rudder blade has reached the degree angle required by the left side rotation test, and meets the inspection requirements; When it is necessary to detect the flexibility of a certain degree angle of the right side of the rudder blade, the rotating support (1) is manually rotated to the right side, the emission light source of the laser emitter is rotated together, whether the indicating scale line (14) coincides with the scale line of the same angle on the right side of the scale (13) is observed, when the indicating scale line coincides with the scale line, the magnetic positioning column (6) is adsorbed on the positioning ring (12), the rotating support is fixed, then the construction personnel in the dock use the equipment to drag the rudder blade, when the bottom center line of the rudder blade coincides with the dock berth center line and the laser cross line, it is confirmed that the rudder blade has reached the degree angle required by the left side rotation test, and meets the inspection requirements.

2. The rudder blade rotation angle detection method according to claim 1, wherein The rotating support has a chassis, two support frames are symmetrically arranged on the chassis, the two support frames are vertically arranged, the top of the support frame is fixed with a laser fixing plate (9), the laser emitter passes through the center of the laser fixing plate, four adjusting bolts (8) are arranged on one of the laser fixing plates, and the four adjusting bolts are arranged at equal intervals along the circumference of the laser emitter.

3. The method for detecting the rudder blade rotation angle according to claim 1, wherein The scale is 1°.

4. The rudder blade rotation angle detection method according to claim 1, wherein The upper surface of the base is embedded with a level (11).

5. The method for detecting the rudder blade rotation angle according to claim 1, wherein The outer surface of the support adjusting rod is provided with threads, the bottom of the support adjusting rod is provided with a base (4), a lower nut is matched, the lower nut is located above the base, the top thereof is inserted from below the base, an upper nut (5) is matched, the upper nut is located below the base, the height of the base from the ground is adjusted by adjusting the upper nut and the lower nut.

6. The rudder blade rotation angle detection method according to claim 2, wherein The magnetic positioning column is located on the bottom disc.

7. The rudder blade rotation angle detection method according to claim 4, wherein The specific process of leveling the detection device is that the moving direction of the bubble of the level (11) on the detection device is observed, the height of the support adjusting rod (3) is adjusted according to the moving direction of the bubble, the bubble is located in the horizontal value range detected by the level, and the base of the detection device is ensured to be in a horizontal state.

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