Marine propeller static balance detection device and detection method

Abstract

The invention discloses a marine propeller static balance detection device and a marine propeller static balance detection method. The propeller centering device comprises a bearing platform and a centering assembly, a suspension device is arranged in the middle of the lower portion of the bearing platform, the centering assembly comprises a centering disc and a plurality of clamping jaws which are arranged on the centering disc and can synchronously move inwards and outwards relative to the center of the positioning disc, and a propeller is directly located on the centering disc and is supported outwards from the interior of the centering disc through the clamping jaws for centering. The bearing platform is provided with a force measuring sensor, the centering assembly can suspend through the suspension device, and the force measuring sensor carries out data acquisition in the suspension state so as to carry out deviation detection. The device has the advantages that the working efficiency is greatly improved, the centering precision is also very high, and the accuracy of subsequent data detection is ensured; the service life is greatly prolonged; the centering device is simple in structure, good in parallelism and high in coaxiality, centering accuracy is guaranteed, the whole structural design is very simple, the number of parts is small, transmission links are small, reliability is high, detection data are accurate, and manufacturing cost is not low.

Description

Technical Field

[0001] The invention relates to a static balance test technology for important ship accessories, in particular to a static balance detection device and a detection method for a ship propeller. Background Art

[0002] Ships are important technical equipment for water transportation, maritime transportation and naval mission execution. Marine propellers, as important core components of ship propulsion, are key factors affecting the performance of the entire ship. Propellers often produce vibrations, noise and other problems during operation. The main reason is the imbalance of propeller blades. Therefore, the imbalance of the propeller must be controlled within the allowable range, which has an important impact on the performance of the ship.

[0003] In order to improve the stability and reliability of propeller operation, it is necessary to perform static balance detection on the propeller during the production process. Because the static balance of the propeller has an important impact on the performance of the ship, most manufacturers have long used the balance shaft hanging weight method to achieve the detection purpose. This detection method has low accuracy and potential safety hazards. Therefore, with the improvement of technical level and development and manufacturing requirements, continuous technical innovation has also been proposed for the static balance detection of propellers. Typical technical innovations are as follows: (1) In 2011, Jiangsu University published an invention patent application with the publication number CN102156024A, entitled “High-precision ship propeller hydraulic level gauge”. In the patent application, the main method is to insert the lower centering cone into the outside of the buoy, insert the upper centering cone into the outside of the buoy, insert the propeller to be tested into the buoy and place it between the upper centering cone and the lower centering cone (centering); place the level gauge in the center of the buoy cover, hang the force sensor assembly on the tip of the propeller to be tested, and hang the counterweight on the force sensor assembly for balance adjustment. Although this detector The pressure signal can be collected by the sensor to obtain the imbalance data of the propeller. However, in the actual operation process, this solution requires the propeller to be hoisted and assembled between the upper and lower centering cones. The whole assembly process is very troublesome and the work efficiency is low, especially for large propellers (whose weight is as high as 100 tons or more). The height of the entire buoy is very high. At this time, manual climbing is required for assembly and disassembly, which is dangerous, labor-intensive and time-consuming. Moreover, during measurement, the sensor is reciprocatingly installed and the counterweight method is used for leveling detection, which results in a large detection error.

[0004] (2) In 2016, Jiangsu University filed another invention patent application with the publication number CN106556493A, entitled “A static balance instrument for detecting uneven weight of ship propellers”. The patent application mainly disclosed that the sensor assembly is installed around the outer cylinder to detect the pressure on the outer cylinder and transmit it to the data acquisition card through a data cable; the data acquisition card is connected to the host computer through a data cable. This technical content has indeed solved the defect of repeated installation of sensors during detection. However, it has two difficult to solve technical problems. On the one hand, the propeller is still installed outside the outer cylinder and positioned by the lower centering cone and the upper centering cone. Therefore, the propeller will rotate during the suspension process, causing the outer cylinder and the inner hole of the propeller to shake, increasing the measurement error. On the other hand, the sensor assembly is installed around the outer cylinder, and the value detected by it is very likely to be the error value of the outer cylinder itself rather than the actual deviation value of the propeller. Therefore, it is difficult to ensure the accuracy and reliability of the data.

[0005] (3) In 2019, Jiangsu University of Science and Technology filed an invention patent application with publication number CN110779657A, entitled “A static balance detection device and unbalanced weight detection method for marine propellers”. The patent application disclosed that the mass of the propeller and the centering mechanism are borne by three protective covers, which reduces the wear of the suspension ball head and the pressure of the bearing column. At the same time, a centering detection mechanism was designed, which adopted three sets of pushing devices to achieve the vertical balance of the propeller and the core shaft. The data collected by the force sensor was analyzed and the unbalanced mass was calculated. The device did solve the problem of the outer cylinder and the inner hole of the propeller shaking and increasing the measurement error in the patent application with publication number CN106556493A. However, it detects the value of the flange and calibrates the deviation value of the propeller by the flange value. There are many intermediate links and the detection data is still inaccurate. In addition, although its structural design is more scientific and reasonable, its structural design is very complex, the manufacturing cost is high, and the reliability of use is low. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a marine propeller static balance detection device and detection method which have simple structural design, accurate data detection, quick and convenient detection and low manufacturing cost.

[0007] In order to solve the above technical problems, the static balance detection device for a marine propeller of the present invention comprises a carrying platform, a centering component located above the carrying platform and used for centering the propeller, a suspension device for suspending the centering component is arranged at the lower middle part of the carrying platform, the centering component comprises a centering plate and a plurality of claws arranged on the centering plate and capable of synchronously moving inward and outward relative to the center of the positioning plate, the propeller is directly seated on the centering plate and supported from the inside to the outside by the claws for centering, at least three force sensors located at different positions of the centering plate are provided on the carrying platform, the centering component can be suspended by the suspension device and in the suspended state, data is collected by force sensors located at different positions for deviation detection.

[0008] The suspension device includes a support tube arranged at the bottom of the supporting platform, a suspension ball seat placed in the support tube for suspending the centering plate, and a suspension ball head placed in the suspension ball seat and cooperating with the suspension ball seat to form a sealed oil chamber. The suspension ball head is connected to an oil filling pipe that passes through the sealed oil chamber. Injecting hydraulic oil into the sealed oil chamber through the oil filling pipe can suspend the suspension ball seat, thereby driving the centering plate to float.

[0009] The suspended ball head is fixedly mounted on the top of a seat tube, and the oil injection pipe extends from the seat tube and is connected to the oil pressure device.

[0010] A sensor placement hole is provided in the bearing platform, and the force sensor is placed in the sensor placement hole.

[0011] A sensor sleeve seat is arranged in the sensor placement hole, and the sensor sleeve seat comprises a sleeve, a slide seat arranged in the sleeve, and a sealing plate for encapsulating the slide seat in the sleeve. A top pressure hole for cooperating with a hydraulic device is arranged at the bottom of the slide seat.

[0012] The bottom of the centering plate is provided with a positioning hole that matches the force sensor, and the top of the force sensor is installed with a top block that matches the positioning hole; the force sensor is fixedly installed on the top of the slide and can make the top block extend into the positioning hole under the drive of the hydraulic device.

[0013] The positioning hole is a tapered hole, and the top block is a tapered top block used to cooperate with the tapered hole.

[0014] The top outer surface of the claw has an arc-shaped guide surface capable of guiding the propeller during the supporting process.

[0015] An annular plate is arranged in the middle of the support tube, and the space above the annular plate serves as a sealed space for the movement of the suspension ball seat. The top of the seat tube is fixedly mounted on the annular plate.

[0016] The bottom surface of the centering plate is provided with a frustum hole, and the top surface of the suspension ball seat is provided as a frustum surface adapted to the frustum hole.

[0017] The detection method using the above-mentioned marine propeller static balance detection device comprises the following steps: S1: Adjust the support range of the claw to be smaller than the inner diameter of the propeller, and then hoist the propeller on the positioning plate. At this time, the adjustment claw will move outward synchronously relative to the center of the positioning plate, and support the propeller from the inside to the outside to complete the centering of the propeller; S2: Hydraulic oil is injected into the sealing oil chamber through the oil pressure device, so that the suspension ball seat is suspended, and the suspension ball seat is suspended and drives the centering plate to float up; S3: The slide is driven upward in the sleeve by a hydraulic device. At this time, the force sensor installed on the top of the slide contacts the centering plate, and the top block presses into the positioning hole. At this time, the force of the suspended centering plate can be measured. S4: The force sensor transmits the measured data to the control system for analysis and calculation of the eccentric weight value of the blade.

[0018] The advantages of the present invention are: (1) By setting up a centering assembly above the carrying platform and a suspension device below the carrying platform, the propeller can be directly placed on the centering assembly and centered by the centering assembly. The centering is changed from the original cone sleeve positioning to plane positioning, which not only reduces the overall height of the propeller and facilitates the operation of the operator, but also reduces the operation process (because the product size is too large, the height of the entire product is high after the traditional positioning cone is positioned, and the positioning cone sleeve must be climbed and installed, which saves the installation and locking steps of the positioning cone sleeve), greatly improving the work efficiency. Moreover, the positioning process of the positioning assembly itself is quick and convenient, and the centering accuracy is also high, which ensures the accuracy of subsequent data detection.

[0019] (2) A plurality of force sensors are directly arranged on the bearing platform at different positions of the centering disk. At the same time, a suspension device is directly arranged under the centering assembly. Thus, on the one hand, the suspension device can directly suspend the centering assembly. On the other hand, the suspension device and the bearing platform are installed in coordination with each other, so that a clever coordination structure is formed between the three parts, thereby ensuring the position accuracy between the three parts and further ensuring the detection effect. On the other hand, the force sensor is directly installed on the bearing platform to measure the force of the centering assembly, which cleverly utilizes the relative position relationship of the three parts and further improves the accuracy of the detection.

[0020] (3) A sensor sleeve seat is provided in the sensor placement hole and the sensor sleeve seat is designed so that the force sensor sleeve seat can be lifted up and down, thereby avoiding the problem of damage caused by the force sensor always being in contact with the centering plate and greatly extending the service life.

[0021] (4) By designing the suspension device, the support tube is directly used as the base support of the bearing platform, and the suspension ball seat and the suspension ball head that cooperates with the suspension ball seat to form a sealed oil chamber are placed in the support tube, which not only makes it parallel but also has high coaxiality, ensuring the accuracy of the alignment and further ensuring the accuracy of subsequent data detection.

[0022] (5) The entire structural design is very simple, with few parts and few transmission links, so it has high reliability and accurate detection data. In addition, the relatively simple structural design makes its manufacturing cost very low. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the static balance detection device for a marine propeller of the present invention; Figure 2 It is a schematic cross-sectional structure diagram of a static balance detection device for a marine propeller of the present invention; Figure 3 for Figure 2 A is an enlarged structural diagram of FIG. DETAILED DESCRIPTION

[0024] The static balance detection device and detection method for a marine propeller of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Example

[0025] like Figure 1-2 As shown, the static balance detection device for a marine propeller of the present invention comprises a carrying platform 1, a centering assembly 3 located above the carrying platform for centering a propeller 2, and a suspension device 4 for suspending the centering assembly 3 is provided at the lower middle part of the carrying platform 1. Figure 2As shown, the suspension device 4 includes a support tube 9 arranged at the bottom of the supporting platform 1, a suspension ball seat 10 placed in the support tube 9 for suspending the centering disk, and a suspension ball head 12 placed in the suspension ball seat and cooperating with the suspension ball seat to form a sealed oil chamber 11, and the suspension ball head 12 is connected to an oil filling pipe 13 that passes through the sealed oil chamber. The suspension ball seat can be suspended by injecting hydraulic oil into the sealed oil chamber through the oil filling pipe 13, thereby driving the centering disk to float. In this embodiment, the support tube 9 has an upper flange and a lower flange, and an annular groove that cooperates with the upper flange of the support tube 9 is provided below the supporting platform 1. The upper flange of the support tube 9 is positioned and installed in the annular groove to form an integral structure, thereby improving the accuracy of positioning and installation. The upper flange of the support tube 9 is directly fixedly installed on a base plate, and the support tube 9 and the suspension ball seat 10 are smoothly matched and a sealing ring is provided between the support tube 9 and the suspension ball seat 10, which is similar to a piston structure. The float head 12 is fixedly mounted on the top of a seat tube 14, and the seat tube 14 is also fixedly mounted on the base plate 5. The oil filling pipe 13 extends from the seat tube 14 and is connected to the oil pressure device; the centering component 3 includes a centering plate 6 and three (preferably four) claws 7 arranged on the centering plate that can move synchronously inward and outward relative to the center of the positioning plate. The top outer surface of the claw 7 has an arc-shaped guide surface 22 that can guide the propeller during the support process. The propeller 2 is directly located on the centering plate and supported from the inside to the outside by the claw 7 for centering. The bearing platform 1 has at least three force sensors 8 (preferably four) located in different positions of the centering plate 6. As can be seen from the figure, a sensor placement hole 26 is provided in the bearing platform 1, and the above-mentioned force sensor 8 is placed in the sensor placement hole. The centering component 3 can be suspended by the suspension device 4 and in the suspended state, force sensors located in different positions perform data acquisition for deviation detection.

[0026] Furthermore, a sensor sleeve seat 16 can be arranged in the sensor placement hole 26, and the sensor sleeve seat 16 includes a sleeve 17, a slide seat 18 arranged in the sleeve, and a sealing plate 19 for encapsulating the slide seat in the sleeve. The bottom of the slide seat 18 is provided with a top pressure hole 21 for cooperating with the hydraulic device 20, wherein the bottom edge of the slide seat 18 is provided with an outer flange that can slide with the sleeve 17 and avoid escaping from the sleeve. Of course, in order to facilitate installation, the sensor placement hole 26 is set as a stepped hole, and the bottom edge of the sleeve 17 is provided with a pressure hole 21 for cooperating with the hydraulic device 20. A mounting flange is installed in cooperation with the stepped hole; in addition, a positioning hole 15 cooperating with the force sensor 8 can be provided at the bottom of the centering disk 6, and a top block 21 cooperating with the positioning hole is installed on the top of the force sensor 8; the force sensor 8 is fixedly installed on the top of the slide and can extend the top block 21 into the positioning hole under the drive of the hydraulic device. Preferably, the positioning hole 15 is a conical hole, and the top block 21 is a conical top block for cooperating with the conical hole. Therefore, this structural design can achieve the function of precise guiding and positioning, thereby further improving the detection accuracy.

[0027] Furthermore, the bottom surface of the centering disk 6 is provided with a frustum hole 24, and the top surface of the suspension ball seat 10 is provided with a frustum surface 25 adapted to the frustum hole. Accurate positioning effect can be achieved through the cooperation of the frustum hole 24 and the frustum surface 25, thereby further improving the accuracy of detection.

[0028] Furthermore, an annular plate 23 is provided in the middle of the support tube 9, and the space above the annular plate 23 serves as a sealed space for the movement of the suspension ball seat 10. The top of the seat tube 14 is fixedly mounted on the annular plate. This structural design is easy to install, fits tightly, and has precise transmission, which further improves the detection accuracy. Example

[0029] This embodiment is a detection method using the static balance detection device for marine propellers in Embodiment 1, comprising the following steps: S1: Adjust the support range of the claw 7 to be slightly smaller than the inner diameter of the propeller 2, and then hoist the propeller 2 on the positioning plate. At this time, adjust the claw 7 to move outward synchronously relative to the center of the positioning plate, and support the propeller from the inside to the outside to complete the centering of the propeller; S2: Hydraulic oil is injected into the sealing oil chamber through the oil pressure device, so that the suspension ball seat is suspended, and the suspension ball seat is suspended and drives the centering plate to float up; S3: The slide 18 is driven to move upward in the sleeve by the hydraulic device. At this time, the force sensor 8 installed on the top of the slide contacts the centering plate, and the top block 21 presses into the positioning hole 15. At this time, the suspended centering plate can be measured. S4: The force sensor 8 transmits the measured data to the control system for analysis and calculation of the eccentric weight value of the blade.

[0030] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A static balance detection device for a marine propeller, characterized in that: The invention comprises a bearing platform (1), a centering assembly (3) located above the bearing platform and used for centering a propeller (2), a suspension device (4) for suspending the centering assembly (3) being provided at the middle of the lower part of the bearing platform (1), the centering assembly (3) comprising a centering plate (6) and a plurality of claws (7) arranged on the centering plate and capable of synchronously moving inward and outward relative to the center of the positioning plate, the propeller (2) being directly seated on the centering plate and supported from the inside to the outside by the claws (7) for centering, the bearing platform (1) having at least three force sensors (8) located at different positions of the centering plate (6), the centering assembly (3) being capable of being suspended by the suspension device (4) and in a suspended state, data is collected by the force sensors located at different positions for deviation detection.

2. The static balance detection device for a marine propeller according to claim 1, characterized in that: The suspension device (4) comprises a support tube (9) arranged at the bottom of the bearing platform (1), a suspension ball seat (10) arranged in the support tube (9) for suspending the centering plate, and a suspension ball head (12) arranged in the suspension ball seat and cooperating with the suspension ball seat to form a sealed oil chamber (11); the suspension ball head (12) is connected to an oil injection pipe (13) that passes through the sealed oil chamber, and hydraulic oil is injected into the sealed oil chamber through the oil injection pipe (13) to suspend the suspension ball seat, thereby driving the centering plate to float.

3. The static balance detection device for a marine propeller according to claim 2, characterized in that: The suspension ball head (12) is fixedly mounted on the top of a seat tube (14), and the oil injection pipe (13) extends from the seat tube (14) and is connected to the oil pressure device.

4. The static balance detection device for a marine propeller according to claim 1, 2 or 3, characterized in that: A sensor placement hole (26) is provided in the carrying platform (1), and the force sensor (8) is placed in the sensor placement hole.

5. The static balance detection device for a marine propeller according to claim 4, characterized in that: A sensor sleeve seat (16) is arranged in the sensor placement hole (26), and the sensor sleeve seat (16) comprises a sleeve (17), a slide seat (18) arranged in the sleeve, and a sealing plate (19) for sealing the slide seat in the sleeve, and a top pressure hole (21) for cooperating with a hydraulic device (20) is arranged at the bottom of the slide seat (18).

6. The static balance detection device for a marine propeller according to claim 5, characterized in that: The bottom of the centering plate (6) is provided with a positioning hole (15) that cooperates with the force sensor (8), and the top of the force sensor (8) is installed with a top block (21) that cooperates with the positioning hole; the force sensor (8) is fixedly installed on the top of the slide seat and can be driven by a hydraulic device to make the top block (21) extend into the positioning hole.

7. The static balance detection device for a marine propeller according to claim 6, characterized in that: The positioning hole (15) is a tapered hole, and the top block (21) is a tapered top block used to cooperate with the tapered hole.

8. The static balance detection device for a marine propeller according to claim 1, 2, 3, 5, 6 or 7, characterized in that: The top outer surface of the claw (7) has an arc-shaped guide surface (22) capable of guiding the propeller during the supporting process.

9. The static balance detection device for a marine propeller according to claim 3, characterized in that: An annular plate (23) is provided in the middle of the support tube (9), the space above the annular plate (23) serves as a sealed space for the suspension ball seat (10) to move, and the top of the seat tube (14) is fixedly mounted on the annular plate.

10. The static balance detection device for a marine propeller according to claim 9, characterized in that: The bottom surface of the centering plate (6) is provided with a frustum hole (24), and the top surface of the suspension ball seat (10) is provided with a frustum surface (25) adapted to the frustum hole; the detection method of the static balance detection device for a marine propeller according to any one of claims 1 to 10 is characterized by comprising the following steps: S1: The support range of the clamping claw (7) is adjusted to be smaller than the inner diameter of the propeller (2), and the propeller (2) is then hoisted on the positioning plate. At this time, the clamping claw (7) is adjusted to move outward synchronously relative to the center of the positioning plate, and the centering of the propeller is completed by supporting the inside of the propeller outward; S2: Hydraulic oil is injected into the sealing oil chamber through the oil pressure device, so that the suspension ball seat is suspended, and the suspension ball seat is suspended and drives the centering plate to float up; S3: The slide (18) is driven to move upward in the sleeve by a hydraulic device, and the force sensor (8) installed on the top of the slide contacts the centering plate, and the top block (21) is pressed into the positioning hole (15), and the force of the suspended centering plate can be measured; S4: The force sensor (8) transmits the measured data to the control system for analysis and calculation of the eccentric weight value of the blade.

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