Propeller static balance detection device for ship

Abstract

The invention relates to the technical field of detection equipment, in particular to a ship propeller static balance detection device which comprises a rotary table, a rotating and fixing arm and a supporting shaft, the axis of the rotary table is vertical, the rotating and fixing arm is horizontally installed on the rotary table, the length direction of the rotating and fixing arm is in the radial direction of the rotary table, and the supporting shaft is installed at the end, away from the rotary table, of the rotating and fixing arm. The axis of the supporting shaft is vertical, the supporting shaft rotates on the rotating and fixing arm, and a clamping structure used for fixing the propeller is arranged on the supporting shaft; the gravity center shift of the propeller is detected by using centrifugal force to replace the action of gravity in a traditional mode, and larger acting force can be provided for the propeller, so that small unbalance can be detected more easily, and the detection sensitivity is improved; through the damping structure, the propeller can be rapidly decelerated and stopped as soon as possible, the situation that the propeller needs to be naturally decelerated for a long time to stop in a traditional method is avoided, and the detection time is greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of detection equipment, and in particular to a static balance detection device for a propeller of a ship. Background Art

[0002] The propeller is one of the key components in the ship propulsion system, and its performance directly affects the navigation efficiency and safety of the ship. The propeller needs to be statically balanced during the manufacturing and maintenance process to ensure that it will not vibrate or cause mechanical failure due to imbalance during use. The traditional static balance detection method is to install the propeller on a balance frame so that the propeller can rotate freely. Due to the action of gravity and friction, the propeller will gradually stop, record the position of the propeller when it is stationary, rotate the propeller again, and observe whether its state when it is stationary is consistent with the initial state when it is stationary. Then, perform multiple rotations again for inspection. When the center of gravity of the propeller is offset, its position is consistent each time it is stationary. When the center of gravity of the propeller is located at its own axis position, the position of the propeller when it is stationary is inconsistent, thereby realizing the static balance test of the propeller. However, in this test method, since the force of gravity on the propeller in the eccentric state is constant and small, it cannot realize the detection work when the propeller eccentricity is small, that is, the sensitivity of the traditional detection method is low, and since the propeller needs to be naturally decelerated and stationary from the rotating state, it takes a long time and has low detection efficiency. Summary of the invention

[0003] In view of at least one of the above technical problems, the present invention provides a static balance detection device for a ship propeller, and the specific technical solution adopted is: According to a first aspect of the present invention, there is provided a static balance detection device for a propeller for a ship, comprising a turntable, a turntable arm and a support shaft, wherein the axis of the turntable is vertical, the turntable arm is horizontally mounted on the turntable, and the length direction of the turntable arm is along the radial direction of the turntable, the support shaft is mounted on the end of the turntable arm away from the turntable, and the axis of the support shaft is vertical, the support shaft rotates on the turntable arm, and a clamping structure for fixing the propeller is arranged on the support shaft; When the turntable rotates, the propeller performs centrifugal motion, and a damping structure is provided at the bottom of the support shaft, and the damping structure is used to decelerate the rotating propeller.

[0004] In some embodiments of the present invention, the damping structure includes a turntable mounted at the bottom of the support shaft, a long magnet is arranged at the bottom of the turntable, the length direction of the long magnet is along the radial direction of the turntable, and a coil is arranged on the outside of the long magnet; A fixing frame is fixed on the rotating arm, a resistance block is fixed on the fixing frame, and the resistance block is connected to two ends of the coil.

[0005] In some embodiments of the present invention, a magnetic field detector is fixed on the fixing frame, and the magnetic field detector is located below the long strip magnet.

[0006] In some embodiments of the present invention, a cylinder is fixed at the bottom of the rotating arm, and an extrusion plate is provided at the movable end of the cylinder, and the extrusion plate is used in conjunction with the rotating disk.

[0007] In some embodiments of the present invention, the clamping structure includes a plurality of clamping plates distributed in a ring shape around the axis of the support shaft, the clamping plates are connected to the support shaft via two inclined oblique arms, and the two oblique arms on the clamping plates are parallel to each other; The shape of the splint is a right angle, the horizontal part of the splint is used to hold up the propeller, the vertical part of the splint is used to connect with two oblique arms, a pressure plate is inserted into the support shaft, a thread is provided on the outer wall of the support shaft, and a lock nut is screwed onto the thread.

[0008] In some embodiments of the present invention, a movable ring is provided on the sliding sleeve of the support shaft, and the movable ring is connected to each clamping plate through a connecting rod.

[0009] In some embodiments of the present invention, the detection device also includes an outer box body, which is located on the outside of the turntable, the rotating arm and the support shaft. The turntable is rotatably installed in the outer box body, an opening is set on the top of the outer box body, and a box cover is installed on the opening. A main motor, an air hopper and a pump body are arranged on the outer box body, the output end of the main motor is connected to the turntable, the air hopper is connected to the inside of the outer box body, and the output end of the pump body is connected to the air hopper.

[0010] In some embodiments of the present invention, a buckle plate is rolled on the turntable, the fixing arm slides through the buckle plate along the radial direction of the propeller, and a locking bolt for locking the fixing arm is provided on the buckle plate.

[0011] The beneficial effects of the present invention are: Using centrifugal force to detect the center of gravity offset of the propeller to replace the effect of gravity in the traditional method can provide a greater force for the propeller, making it easier to detect small imbalances and improving the sensitivity of the detection; the damping structure can quickly decelerate the propeller and stop it as soon as possible, avoiding the situation in the traditional method where the propeller needs to decelerate naturally for a long time before stopping, greatly shortening the detection time; the structure is simple, the detection process is simplified, and the propeller can be driven to perform centrifugal motion by rotating the turntable and the propeller, which is more convenient and quick to operate; in summary, by introducing centrifugal force detection and damping structure, the problems of low detection accuracy and long time consumption in the traditional static balance detection method are solved, and the detection efficiency and reliability are improved. At the same time, this solution has the advantages of convenient operation, high degree of automation, and wide application range, and is suitable for the high requirements for propeller static balance detection in the modern shipbuilding industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 yes Figure 1 A magnified schematic diagram of the internal structure of the middle and outer boxes; Figure 3 yes Figure 2 Schematic diagram of the structure of the middle support shaft and propeller; Figure 4 yes Figure 3 Schematic diagram of the structure after the propeller is removed; Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of the clamping structure. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below 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, rather than all the embodiments. In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. This embodiment is written in a progressive manner.

[0016] like Figures 1 to 5As shown, a static balance detection device for a propeller for a ship of the present invention comprises a turntable 1, a turntable arm 2 and a support shaft 3, the axis of the turntable 1 is vertical, the turntable arm 2 is horizontally installed on the turntable 1, and the length direction of the turntable arm 2 is along the radial direction of the turntable 1, the support shaft 3 is installed at the end of the turntable arm 2 away from the turntable 1, and the axis of the support shaft 3 is vertical, the support shaft 3 rotates on the turntable arm 2, and a clamping structure for fixing the propeller 4 is provided on the support shaft 3; When the turntable 1 rotates, the propeller 4 performs centrifugal motion, and a damping structure is provided at the bottom of the support shaft 3, and the damping structure is used to decelerate the propeller 4 in a rotating state.

[0017] In the above embodiment, since the axis of the support shaft 3 is vertical, the propeller 4 is installed on the support shaft 3 through the clamping structure, so the axis of the propeller 4 is also vertical, and the rotating arm 2 is used to support the support shaft 3. When the static balance test of the propeller 4 is performed, the propeller 4 is rotated so that it can rotate freely, and the turntable 1 is rotated to make the rotating arm 2, the support shaft 3 and the propeller 4 perform centrifugal motion. Since the support shaft 3 can rotate on the rotating arm 2, the propeller 4 can rotate freely on the rotating arm 2. When the center of gravity of the propeller 4 structure is eccentric, due to the action of the centrifugal force and the damping structure, the rotation speed of the propeller 4 gradually decreases. The propeller 4 is lowered until it stops, and the center of gravity of the propeller 4 will be biased to the side away from the turntable 1, that is, the support shaft 3 will be located between the turntable 1 and the center of gravity of the propeller 4, and the propeller 4 is rotated again and made to rotate. When the rotation of the propeller 4 stops again, the positions of the propeller 4 on the rotating arm 2 during the two tests are compared. When the positions of the propeller 4 during the two tests are the same, the center of gravity of the propeller 4 deviates from the axis of the propeller 4, and the static balance test of the propeller 4 fails. When the two test results are inconsistent, the static balance test of the propeller 4 passes, thereby realizing the static balance test of the propeller 4. Of course, multiple measurements can also be performed to improve the detection accuracy.

[0018] Based on the above embodiment, since the propeller 4 can rotate freely on the rotating arm 2 with the help of the support shaft 3, and gravity will not interfere with the rotation of the propeller 4 at this time, only the damping structure can be used to gradually reduce the rotation speed of the propeller 4 to prevent the propeller 4 from rotating continuously for a long time, thereby shortening the detection time. In addition, compared with gravity detection, the centrifugal force detection method can provide a larger and more precise force for the propeller 4, thereby improving the detection accuracy.

[0019] Using centrifugal force to detect the center of gravity offset of the propeller 4 to replace the effect of gravity in the traditional method can provide a greater force for the propeller 4, so that it is easier to detect small imbalances and improve the sensitivity of the detection; the damping structure can quickly decelerate the propeller and make it stop as soon as possible, avoiding the situation in the traditional method that the propeller needs to decelerate naturally for a long time before it can stop, greatly shortening the detection time; the structure is simple, the detection process is simplified, and the propeller 4 can be driven to perform centrifugal movement by rotating the turntable 1 and the propeller 4, which is more convenient and quick to operate; in summary, by introducing centrifugal force detection and damping structure, the problems of low detection accuracy and long time consumption in the traditional static balance detection method are solved, and the detection efficiency and reliability are improved. At the same time, the scheme has the advantages of convenient operation, high degree of automation, and wide application range, and is suitable for the high requirements for propeller static balance detection in the modern shipbuilding industry.

[0020] In some embodiments of the present invention, Figure 3 As shown, the damping structure includes a turntable 5 installed at the bottom of the support shaft 3, a long magnet 6 is arranged at the bottom of the turntable 5, the length direction of the long magnet 6 is along the radial direction of the turntable 5, and a coil 7 is arranged on the outside of the long magnet 6; A fixing frame 8 is fixed on the rotating arm 2 , a resistor block 9 is fixed on the fixing frame 8 , and the resistor block 9 is connected to two ends of the coil 7 .

[0021] In the above embodiment, the clamping structure is located on the support shaft 3 on the upper side of the rotating arm 2, and the turntable 5 is located on the support shaft 3 on the lower side of the rotating arm 2. There is a magnetic field between the two poles of the long magnet 6. When the propeller 4 rotates, it will drive the support shaft 3, the turntable 5 and the long magnet 6 to rotate synchronously, and the magnetic field around the coil 7 will produce periodic changes. At this time, an induced current will be generated inside the coil 7, and the induced current will be transmitted in the resistor block 9. The function of the resistor block 9 is mainly for circuit protection. Due to the effect of the back electromotive force generated by the current inside the coil 7, it will generate resistance to the rotation of the long magnet 6 and the turntable 5. The higher the speed, the greater the resistance. Therefore, this structural method can be used to generate resistance to the rotation of the propeller 4, so that the speed of the propeller 4 gradually decreases and stops.

[0022] Since the resistance generated by the back electromotive force is related to the rotational speed of the propeller 4, when the rotational speed of the propeller 4 decreases, the resistance of the propeller 4 decreases. Combined with the centrifugal force when the propeller 4 is eccentric, the center of gravity of the propeller 4 in the final position can be connected to the support shaft 3 and the rotating arm 2 in a straight line. That is, this method can locate the eccentric position of the propeller 4 to facilitate the subsequent repair work of the propeller 4. This structural method can avoid the amplitude detection work of the propeller 4 in the eccentric state in the traditional method, that is, there is no need to use the amplitude center line of the propeller 4 when it swings back and forth to locate the eccentric position of the propeller 4.

[0023] It should be pointed out that the slower the speed of the propeller 4, the smaller the resistance it encounters. Therefore, it can avoid the phenomenon in which the balance relationship between gravity and friction force causes the center of gravity on the propeller 4 to deviate from the bottom of the axis of the propeller 4 when the friction force is a constant effect on the propeller 4 in the traditional way, thereby avoiding the influence of friction force on the detection work of the propeller 4 and improving the detection accuracy.

[0024] In some embodiments of the present invention, Figure 4 As shown, a magnetic field detector 10 is fixed on the fixing frame 8 , and the magnetic field detector 10 is located below the long magnet 6 .

[0025] In the above embodiment, by setting up the magnetic field detector 10, it is convenient to detect the direction of the magnetic field between the two poles of the long magnet 6, thereby detecting the position of the propeller 4, and conveniently detecting and comparing the position of the propeller 4 each time it is stationary. The magnetic field detector 10 can use Hall effect sensors, magnetoresistors, magnetoresistive diodes, fluxgate sensors, magnetic field analyzers and other structures to complete the detection of the magnetic field direction.

[0026] In some embodiments of the present invention, Figure 3 As shown, a cylinder 11 is fixed at the bottom of the rotating arm 2 , and a squeezing plate 12 is provided at the movable end of the cylinder 11 , and the squeezing plate 12 is used in conjunction with the rotating disk 5 .

[0027] In the above embodiment, when the propeller 4 stops rotating, the cylinder 11 extends and the extrusion plate 12 contacts the turntable 5. At this time, the extrusion plate 12 can lock the position of the turntable 5, so that the propeller 4 is stationary, which makes it convenient for workers to mark the position of the propeller 4 at this time, so as to facilitate the subsequent trimming work of the propeller 4.

[0028] In some embodiments of the present invention, Figure 5 As shown, the clamping structure includes a plurality of clamping plates 13 distributed in a ring shape around the axis of the support shaft 3, the clamping plates 13 are connected to the support shaft 3 via two inclined oblique arms 14, and the two oblique arms 14 on the clamping plates 13 are parallel to each other; Among them, the shape of the clamp 13 is a right angle, the horizontal part of the clamp 13 is used to hold up the propeller 4, the vertical part of the clamp 13 is used to connect with the two inclined arms 14, a pressure plate 15 is inserted into the support shaft 3, a thread is provided on the outer wall of the support shaft 3, and a lock nut 16 is screwed on the thread.

[0029] In the above embodiment, the two inclined arms 14 on the splint 13 form a parallelogram, one end of the inclined arm 14 is rotatably connected to the support shaft 3, and the other end of the inclined arm 14 is rotatably connected to the splint 13, and the inclined arm 14 is inclined upward. When the propeller 4 is mounted on the support shaft 3, the horizontal parts of the multiple splints 13 are located at the bottom of the propeller 4 and lift the propeller 4. Due to the gravity of the propeller 4, the propeller 4 will press the splint 13 to move downward, and the two inclined arms 14 guide the splint 13 and make the splint 13 translate outward. At this time, the vertical part of the splint 13 will contact the inner wall of the propeller 4, thereby utilizing the vertical parts of the multiple splints 13 to realize the external support and fixation of the propeller 4, that is, at this time, the splint 13 realizes the lifting and external support fixing effect on the propeller 4, and the pressure plate 15 is pressed on the top of the propeller 4 and locked with the lock nut 16, thereby fixing the propeller 4.

[0030] Based on the above embodiment, in order to facilitate the multiple clamping plates 13 to be in a retracted state in a natural state, a spring sheet can be installed between each clamping plate 13 and the support shaft 3 .

[0031] In some embodiments of the present invention, Figure 5 As shown, a moving ring 17 is slidably sleeved on the support shaft 3 , and the moving ring 17 is connected to each clamping plate 13 via a connecting rod 18 .

[0032] In the above embodiment, the connecting rod 18 is inclined upward, one end of the connecting rod 18 is rotatably connected to the moving ring 17, and the other end of the connecting rod 18 is rotatably connected to the clamping plate 13. When the clamping plate 13 moves, it will push the moving ring 17 to move through the connecting rod 18. Therefore, the moving ring 17 and multiple connecting rods 18 are used to achieve the synchronous movement effect of multiple clamping plates 13, so that the vertical parts of the multiple clamping plates 13 can synchronously support and fix the propeller 4, which is convenient for positioning the axis of the propeller 4.

[0033] In some embodiments of the present invention, Figure 1 As shown, the detection device also includes an outer box body 19, which is located on the outside of the turntable 1, the rotating arm 2 and the supporting shaft 3. The turntable 1 is rotatably installed in the outer box body 19, an opening is arranged on the top of the outer box body 19, and a box cover 20 is installed on the opening. A main motor 21, an air hopper 22 and a pump body 23 are arranged on the outer box body 19, the output end of the main motor 21 is connected to the turntable 1, the air hopper 22 is connected to the inside of the outer box body 19, and the output end of the pump body 23 is connected to the air hopper 22.

[0034] In the above embodiment, the outer box 19 can isolate the turntable 1 and the propeller 4 in motion thereon, thereby preventing the rotating propeller 4 from causing harm to workers. The opening on the outer box 19 and the box cover 20 can facilitate the disassembly and assembly of the propeller 4, and the main motor 21 can provide power for the turntable 1.

[0035] Since air flow will be generated when the turntable 1 and the propeller 4 are centrifuged, in order to reduce the interference of the air flow on the detection of the propeller 4, the pump body 23 and the air hopper 22 can be used to extract the air in the outer box 19, so that the propeller 4 can complete the detection under a vacuum environment, thereby improving the detection accuracy. When it is necessary to make the propeller 4 rotate, the pump body 23 can be operated in reverse to make the pump body 23 blow air to the propeller 4 through the air hopper 22. At this time, the air flow can blow the propeller 4 to rotate.

[0036] In some embodiments of the present invention, Figure 2 As shown, a buckle plate 24 is rolled on the turntable 1 , and the rotating arm 2 slides through the buckle plate 24 along the radial direction of the propeller 4 . A locking bolt 25 for locking the rotating arm 2 is arranged on the buckle plate 24 .

[0037] In the above embodiment, by providing the buckle plate 24 and the locking bolt 25, the position of the rotating arm 2 on the turntable 1 can be adjusted, thereby adjusting the radius of the support shaft 3 and the propeller 4 during centrifugation, thereby facilitating the adjustment of the centrifugal force.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A static balance detection device for a ship propeller, characterized in that: It includes a turntable, a turntable arm and a support shaft, the turntable axis is vertical, the turntable arm is horizontally installed on the turntable, and the length direction of the turntable arm is along the radial direction of the turntable, the support shaft is installed at the end of the turntable arm away from the turntable, and the axis of the support shaft is vertical, the support shaft rotates on the turntable arm, and a clamping structure for fixing the propeller is arranged on the support shaft; When the turntable rotates, the propeller performs centrifugal motion, and a damping structure is provided at the bottom of the support shaft, and the damping structure is used to decelerate the rotating propeller.

2. A static balance detection device for a ship propeller according to claim 1, characterized in that: The damping structure comprises a turntable mounted at the bottom of the support shaft, a long magnet is arranged at the bottom of the turntable, the length direction of the long magnet is along the radial direction of the turntable, and a coil is arranged on the outside of the long magnet; A fixing frame is fixed on the rotating arm, a resistance block is fixed on the fixing frame, and the resistance block is connected to two ends of the coil.

3. A static balance detection device for a ship propeller according to claim 2, characterized in that: A magnetic field detector is fixed on the fixing frame and is located below the long strip magnet.

4. A static balance detection device for a ship propeller according to claim 3, characterized in that: A cylinder is fixed at the bottom of the rotating arm, and an extrusion plate is arranged at the movable end of the cylinder, and the extrusion plate is used in conjunction with the rotating disk.

5. A static balance detection device for a ship propeller according to claim 4, characterized in that: The clamping structure comprises a plurality of clamping plates distributed in a ring shape around the axis of the support shaft, the clamping plates are connected to the support shaft via two inclined oblique arms, and the two oblique arms on the clamping plates are parallel to each other; The shape of the splint is a right angle, the horizontal part of the splint is used to hold up the propeller, the vertical part of the splint is used to connect with two oblique arms, a pressure plate is inserted into the support shaft, a thread is provided on the outer wall of the support shaft, and a lock nut is screwed onto the thread.

6. A static balance detection device for a ship propeller according to claim 5, characterized in that: A moving ring is provided on the sliding sleeve of the support shaft, and the moving ring is connected to each clamping plate through a connecting rod.

7. A static balance detection device for a ship propeller according to claim 6, characterized in that: The detection device also includes an outer box body, which is located on the outside of the turntable, the rotating arm and the supporting shaft. The turntable is rotatably installed in the outer box body, an opening is set on the top of the outer box body, and a box cover is installed on the opening. A main motor, an air hopper and a pump body are arranged on the outer box body. The output end of the main motor is connected to the turntable, the air hopper is connected to the inside of the outer box body, and the output end of the pump body is connected to the air hopper.

8. A static balance detection device for a ship propeller according to claim 7, characterized in that: A buckle plate is rolled on the turntable, and the rotating arm slides through the buckle plate along the radial direction of the propeller. A locking bolt for locking the rotating arm is arranged on the buckle plate.

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