A yacht drive blade dynamic balancing test system

Abstract

The application discloses a yacht driving paddle dynamic balance testing system and relates to the paddle dynamic balance detection technical field. The application only needs to set the paddle after installation, all supporting springs can limit the rotating shaft in the coaxial position with the supporting ring, obvious vibration changes can occur when the paddle is dynamically unbalanced, the electrical cooperation of the contact plate and the paddle is set, the dynamic unbalance degree of the paddle can be detected through the current or capacitance change period and the size of the capacitance value, and the locking part is set to facilitate users to quickly install the paddle at one end of the rotating shaft, and the detection efficiency of the paddle dynamic balance is improved.

Description

Technical Field

[0001] This invention relates to the field of propeller dynamic balance testing technology, specifically a dynamic balance testing system for yacht propellers. Background Technology

[0002] The necessity of dynamic balancing for marine propeller blades lies in checking the uniformity of their material quality and manufacturing errors, and eliminating or reducing any imbalance to within acceptable limits, thus preparing for the next stage of impeller overspeed testing. If the axial positions of the centers of gravity of each blade are inconsistent, the centrifugal forces generated by each blade during propeller rotation will not lie in the same plane perpendicular to the propeller shaft axis, resulting in an unbalanced dynamic couple, which will lead to vibration of the propeller and shaft system.

[0003] In the prior art, the invention patent with publication number CN115508007B uses a technical solution for a propeller blade dynamic balance detection device. This solution amplifies the vibration amplitude caused by dynamic imbalance during the rotation of the power shaft by setting an amplification disk. Combined with the detection column and contact ball in the detection mechanism to collect the vibration, the vibration is finally transmitted and converted into the movement of the slide plate in the detection box. A light emitter is installed using the positioning groove set on the slide plate. The light emitter is aligned with the photoresistor strip. As the slide plate moves under the push of the detection column, it will drive the light emitter to move on the photoresistor strip, thereby changing the resistance value of the photoresistor strip. The dynamic imbalance of the propeller blade is determined based on the maximum amplitude of the resistance change. However, this solution requires the force couple of the unbalanced power of the propeller blade to resist the elastic deformation of the power shaft in order to detect it. It cannot detect very small errors. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: a dynamic balancing test system for yacht propeller blades, comprising a test platform, an outer frame fixedly mounted on the test platform, a detection platform fixedly mounted on the outer frame, two parallel adjusting screws slidably mounted on the detection platform, and contact plates fixedly mounted at the bottom ends of the two adjusting screws; a detection unit fixedly mounted inside the outer frame, the detection unit comprising two symmetrically arranged support rings, at least three swing beams movably mounted between the two support rings, and two parallel reset slide rods slidably mounted on each swing beam. A movable vibrating sleeve is coaxially arranged in the middle of the support ring. The movable vibrating sleeve has movable beams of the same number as the swing beams. The reset slide rod is fixedly connected to the movable beams. Two parallel support springs are fixedly installed between the swing beams and the movable beams. A C-shaped frame is fixedly installed on the movable vibrating sleeve. A rotating shaft is rotatably installed on the C-shaped frame. One end of the rotating shaft is fixedly installed with a blade through a locking part. The blade is electrically connected to the rotating shaft. The blade is in contact with a contact plate and is used to measure the capacitance value or the current value generated by the contact between the contact plate and the blade.

[0005] Preferably, both adjusting screws are threaded with nut gears, which mesh with each other. An adjusting motor is also fixedly installed on the testing platform, and an adjusting gear that meshes with one of the nut gears is fixedly installed on the output shaft of the adjusting motor.

[0006] Preferably, a cover plate is also fixedly installed on the testing platform, the cover plate is fastened to two nut gears, and two adjusting screws are slidably engaged with the cover plate.

[0007] Preferably, the support ring is fixedly mounted on the outer frame by a support ring support plate, and the support spring is wrapped around the corresponding reset slide rod.

[0008] Preferably, the locking part includes a clamping electric cylinder movably mounted on the C-shaped frame, and a clamping slide rod is fixedly mounted on the C-shaped frame. A clamping rotating block is slidably mounted on the clamping slide rod, and the clamping rotating block is movably engaged with the telescopic rod of the clamping electric cylinder.

[0009] Preferably, a clamping rotating shaft is rotatably mounted on the clamping rotating block. The clamping rotating shaft is used to fasten the blade onto the rotating shaft, and the clamping rotating shaft is inserted into the rotating shaft.

[0010] Preferably, a sliding drive shaft bracket and a drive motor are fixedly installed on the test platform. A sliding drive shaft is rotatably and slidably installed on the sliding drive shaft bracket. The sliding drive shaft and the output shaft of the drive motor are in a sliding engagement via a splined shaft.

[0011] Preferably, a driven sliding frame is fixedly installed at the end of the rotating shaft away from the blade, and an active sliding frame is fixedly installed at the end of the sliding drive shaft away from the drive motor. An intermediate sliding block is slidably installed between the driven sliding frame and the active sliding frame.

[0012] Preferably, the sliding direction of the intermediate sliding block and the driven sliding frame is spatially perpendicular to the sliding direction of the intermediate sliding block and the active sliding frame, in order to counteract the radial displacement generated by the blade during rotation.

[0013] Compared with the prior art, the present invention has the following advantages: (1) The present invention only requires that after the blade is installed, all the support springs can restrict the rotating shaft to the position coaxial with the support ring, so that obvious vibration changes can occur when the blade is dynamically unbalanced; (2) The present invention sets the contact plate and the blade to be electrically connected, and the degree of dynamic imbalance of the blade can be detected by the change period of current or capacitance and the value of capacitance; (3) The locking part set in the present invention makes it convenient for users to quickly install the blade on one end of the rotating shaft, which improves the detection efficiency of blade dynamic balance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the middle sliding block in this invention.

[0016] Figure 3 This is a schematic diagram of the structure of the active shaking sleeve of the present invention.

[0017] Figure 4 This is a cross-sectional view of the active shaking sleeve structure of the present invention.

[0018] In the diagram: 101-Outer frame; 102-Testing table; 103-Adjusting motor; 104-Cover plate; 105-Adjusting screw; 106-Nut gear; 107-Adjusting gear; 108-Contact plate; 201-Support ring support plate; 202-Support ring; 203-Swing beam; 204-Reset slide rod; 205-Support spring; 206-Moving beam; 207-Moving vibrating sleeve; 208-Rotating shaft; 209-C-shaped frame; 210-Clamping electric cylinder; 211-Clamping slide rod; 212-Clamping rotating block; 213-Clamping rotating shaft; 214-Driven sliding frame; 215-Active sliding frame; 216-Sliding drive shaft; 217-Sliding drive shaft bracket; 218-Drive motor; 219-Splined shaft; 220-Intermediate sliding block; 3-Blade; 4-Testing table. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-4 The technical solution of the present invention will be further illustrated through specific embodiments.

[0020] This invention provides a dynamic balancing testing system for yacht propeller blades, including a test bench 4. An outer frame 101 is fixedly mounted on the test bench 4, and a testing platform 102 is fixedly mounted on the outer frame 101. Two parallel adjusting screws 105 are slidably mounted on the testing platform 102, and contact plates 108 are fixedly mounted on the bottom ends of the two adjusting screws 105. Nut gears 106 are threaded onto both adjusting screws 105, and the two nut gears 106 mesh with each other. An adjusting motor 103 is also fixedly mounted on the testing platform 102, and an adjusting gear 107 that meshes with one of the nut gears 106 is fixedly mounted on the output shaft of the adjusting motor 103. A cover plate 104 is also fixedly mounted on the testing platform 102, and the cover plate 104 fastens onto the two nut gears 106, with the two adjusting screws 105 slidingly engaged with the cover plate 104.

[0021] A detection unit is fixedly installed inside the outer frame 101. The detection unit includes two symmetrically arranged support rings 202. At least three swing beams 203 are movably installed between the two support rings 202. Two parallel reset slide rods 204 are slidably installed on each swing beam 203. A movable shaking sleeve 207 is coaxially arranged in the middle of the support rings 202. Movable beams 206, the same number as the swing beams 203, are movably installed on the movable shaking sleeve 207. The reset slide rods 204 are fixed to the movable beams 206. Two parallel support springs 205 are fixedly installed between the swing beam 203 and the movable beam 206. A C-shaped frame 209 is fixedly installed on the movable vibrating sleeve 207, and a rotating shaft 208 is rotatably installed on the C-shaped frame 209. One end of the rotating shaft 208 is fixedly installed with a blade 3 through a locking part. The blade 3 is electrically connected to the rotating shaft 208 and contacts the contact plate 108 for measuring the capacitance value or the current value generated by the contact between the contact plate 108 and the blade 3. The support ring 202 is fixedly installed on the outer frame 101 through the support ring support plate 201, and the support springs 205 are wrapped around the corresponding reset slide rod 204. The locking part includes a clamping electric cylinder 210 movably mounted on a C-shaped frame 209, and a clamping slide rod 211 is fixedly mounted on the C-shaped frame 209. A clamping rotating block 212 is slidably mounted on the clamping slide rod 211, and the clamping rotating block 212 is movably engaged with the telescopic rod of the clamping electric cylinder 210. A clamping rotating shaft 213 is rotatably mounted on the clamping rotating block 212, and the clamping rotating shaft 213 is used to fasten the blade 3 onto the rotating shaft 208, and the clamping rotating shaft 213 is inserted into the rotating shaft 208. A sliding drive shaft bracket 217 and a drive motor 218 are fixedly mounted on the test bench 4. A sliding drive shaft 216 is rotatably and slidably mounted on the sliding drive shaft bracket 217, and the sliding drive shaft 216 and the output shaft of the drive motor 218 are slidably engaged through a splined shaft 219. A driven sliding frame 214 is fixedly mounted on the end of the rotating shaft 208 away from the blade 3, and an active sliding frame 215 is fixedly mounted on the end of the sliding drive shaft 216 away from the drive motor 218. An intermediate sliding block 220 is slidably mounted between the driven sliding frame 214 and the active sliding frame 215. The sliding direction of the intermediate sliding block 220 and the driven sliding frame 214 is spatially perpendicular to the sliding direction of the intermediate sliding block 220 and the active sliding frame 215, which is used to counteract the radial displacement generated by the blade 3 during rotation.

[0022] The working principle of the yacht propeller dynamic balancing test system disclosed in this invention is as follows: The propeller blade 3 is placed at the end of the rotating shaft 208. Then, the extension and retraction of the telescopic rod of the clamping electric cylinder 210 is controlled, causing the clamping rotating shaft 213 to move toward the rotating shaft 208, clamping the propeller blade 3 onto the rotating shaft 208. Then, the drive motor 218 is started. The output shaft of the drive motor 218 drives the spline shaft 219 to rotate. The spline shaft 219 drives the sliding drive shaft 216 to rotate. The sliding drive shaft 216 drives the active sliding frame 215 to rotate. The active sliding frame 215 drives the driven sliding frame 214 to rotate through the intermediate sliding block 220. The driven sliding frame 214 drives the rotating shaft 208 to rotate. Then, the rotating shaft 208 drives the propeller blade 3 to rotate. When the propeller blade 3 rotates, if there is an uneven mass distribution, vibration will occur. For example, since the rotating shaft 208 is mounted on the C-shaped frame 209, and the C-shaped frame 209 is mounted on the movable shaking sleeve 207, the movable shaking sleeve 207 will shake. This shaking is buffered by the support spring 205 (the support force of the bottom support spring 205 is greater than that of the top, so that the movable shaking sleeve 207 remains coaxial with the support ring 202 under the condition of gravity). The purpose of the support spring 205 is to make the movable shaking sleeve 207 always move towards the axis of the support ring 202. That is to say, during the rotation of the defective blade 3, it will drive the movable shaking sleeve 207 to make an eccentric movement. At this time, the driven sliding frame 214 will also be eccentric along with the rotating shaft 208. Therefore, the intermediate sliding block 220 and the active sliding frame 215 are set to counteract the displacement of this eccentricity. Because the mass of blade 3 is uneven, the outer edge of blade 3 will sweep a larger area than theoretically possible during rotation. At this time, by controlling the regulating motor 103, the output shaft of the regulating motor 103 drives the regulating gear 107 to rotate. The regulating gear 107 drives the two nut gears 106 to rotate. The nut gears 106 drive the two regulating screws 105 to move linearly, and then drive the contact plate 108 to move towards blade 3. Depending on the number of blades set in blade 3, if there are 3 blades, when blade 3 contacts the contact plate 108 three times (the side with greater vibration sweeps once, that is, under normal circumstances there will only be one contact per rotation, if there are three contacts, it means that the mass distribution of blade 3 is uniform), it means that blade 3 has rotated once. By applying voltage to the contact plate 108 and the rotating shaft 208, when blade 3 contacts the contact plate 108, current will flow. The periodic changes of the current generation and duration are recorded to detect the rotation speed of blade 3. An AC voltage (using a multimeter) can be applied to the rotating shaft 208 and the contact plate 108, and then the capacitance between the blade 3 and the contact plate 108 can be detected. The distance between the edge of the blade 3 and the contact plate 108 can be determined based on the capacitance value. At the same time, the period of change of the capacitance value can also reflect the rotation speed of the blade 3.

Claims

1. A dynamic balancing test system for yacht propeller blades, comprising a test stand (4), characterized in that: An outer frame (101) is fixedly installed on the test platform (4), and a test platform (102) is fixedly installed on the outer frame (101). Two parallel adjusting screws (105) are slidably installed on the test platform (102), and a contact plate (108) is fixedly installed at the bottom end of the two adjusting screws (105). A detection unit is fixedly installed inside the outer frame (101). The detection unit includes two symmetrically arranged support rings (202). At least three swing beams (203) are movably installed between the two support rings (202). Two parallel reset slide rods (204) are slidably installed on each swing beam (203). A movable shaking sleeve (207) is coaxially arranged in the middle of the support ring (202). The movable shaking sleeve (207) has the same number of movable beams (206) as the swing beams (203) movably installed on it. The reset slide rods (204) are fixed to the movable beams (206). Two parallel support springs (205) are fixedly installed between the swing beam (203) and the movable beam (206). A C-shaped frame (209) is fixedly installed on the movable vibrating sleeve (207). A rotating shaft (208) is rotatably installed on the C-shaped frame (209). One end of the rotating shaft (208) is fixedly installed with a blade (3) through a locking part. The blade (3) is electrically connected to the rotating shaft (208). The blade (3) is in contact with the contact plate (108) and is used to measure the capacitance value or the current value generated by the contact between the contact plate (108) and the blade (3).

2. The dynamic balancing test system for yacht propeller blades according to claim 1, characterized in that: Both of the adjusting screws (105) are threaded with nut gears (106), and the two nut gears (106) mesh with each other. An adjusting motor (103) is also fixedly installed on the testing table (102), and an adjusting gear (107) that meshes with one of the nut gears (106) is fixedly installed on the output shaft of the adjusting motor (103).

3. The dynamic balancing test system for yacht propeller blades according to claim 2, characterized in that: A cover plate (104) is also fixedly installed on the testing platform (102). The cover plate (104) is fastened to two nut gears (106), and two adjusting screws (105) slide in cooperation with the cover plate (104).

4. The dynamic balancing test system for yacht propeller blades according to claim 3, characterized in that: The support ring (202) is fixedly installed on the outer frame (101) by the support ring support plate (201), and the support spring (205) is wrapped around the corresponding reset slide (204).

5. The dynamic balancing test system for yacht propeller blades according to claim 4, characterized in that: The locking part includes a clamping electric cylinder (210) movably mounted on a C-shaped frame (209), and a clamping slide rod (211) is fixedly mounted on the C-shaped frame (209). A clamping rotating block (212) is slidably mounted on the clamping slide rod (211), and the clamping rotating block (212) is movably engaged with the telescopic rod of the clamping electric cylinder (210).

6. The dynamic balancing test system for yacht propeller blades according to claim 5, characterized in that: The clamping rotating block (212) is rotatably mounted with a clamping rotating shaft (213), which is used to fasten the blade (3) onto the rotating shaft (208), and the clamping rotating shaft (213) and the rotating shaft (208) are inserted into each other.

7. The dynamic balancing test system for yacht propeller blades according to claim 6, characterized in that: The test bench (4) is fixedly installed with a sliding drive shaft bracket (217) and a drive motor (218). The sliding drive shaft (216) is rotatably and slidably installed on the sliding drive shaft bracket (217). The sliding drive shaft (216) and the output shaft of the drive motor (218) are in spline sliding engagement through a spline shaft (219).

8. The dynamic balancing test system for yacht propeller blades according to claim 7, characterized in that: A driven sliding frame (214) is fixedly installed at the end of the rotating shaft (208) away from the blade (3), and an active sliding frame (215) is fixedly installed at the end of the sliding drive shaft (216) away from the drive motor (218). An intermediate sliding block (220) is slidably installed between the driven sliding frame (214) and the active sliding frame (215).

9. The dynamic balancing test system for yacht propeller blades according to claim 8, characterized in that: The sliding direction of the intermediate sliding block (220) and the driven sliding frame (214) is spatially perpendicular to the sliding direction of the intermediate sliding block (220) and the active sliding frame (215), which is used to counteract the radial displacement generated by the blade (3) during rotation.

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