Shaft power detector of ship propeller shaft

Abstract

The invention discloses a shaft power detector for a ship propeller shaft, and belongs to the field of propeller shaft detection. Comprising a main shaft, a protection mechanism is arranged in the middle of the outer side of the main shaft, the protection mechanism comprises a semi-arc-shaped cover arranged in the middle of the outer side of the main shaft, a detection assembly used for detecting shaft power is arranged on the outer circle face of the main shaft, and an adjusting mechanism used for adjusting the position of the detection assembly is arranged on the inner side of the semi-arc-shaped cover; a driving mechanism for driving the adjusting mechanism to move is arranged on the outer side of the semi-arc cover; when shaft power detection is carried out, the two semi-arc-shaped covers are connected through the bolts to form the sealed cylindrical cover, and the sealed cylindrical cover is filled with the moisture-proof silica gel and is combined with the hydrophobic film of the air holes, so that seawater moisture and oil stains are isolated; the threaded seats are driven to move oppositely through bidirectional threads of the first lead screw, the detection pieces are forcibly limited to be precisely attached to the main shaft at the included angle of 45 + / -0.5 degrees through hinged linkage of the supporting rods and the connecting plate, and manual pasting angle deviation is eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of propeller shaft detection, and more specifically, to a shaft power detector for a ship's propeller shaft. Background Art

[0002] The detection of the shaft power of a ship's propeller is a core technology for ship energy efficiency management, fault warning, energy conservation and emission reduction. With the strict restrictions of the International Maritime Organization on ship carbon emissions, accurately measuring the shaft power has become a key means to optimize the matching of the main engine - propeller and reduce fuel consumption.

[0003] Traditional shaft power detection technology uses a full-bridge circuit of resistance strain gauges to achieve torque measurement. Operators symmetrically paste 4 strain gauges along the 45° or 135° direction on the surface of the propeller shaft. By measuring the change in the resistance of the strain gauges caused by the torsional deformation of the shaft body, combined with the output torque signal of the Wheatstone bridge; use epoxy resin or cyanoacrylate adhesive to encapsulate the strain gauges to ensure that they are closely attached to the shaft surface in a high-speed rotation and vibration environment; and the strain signal is sent to the data processor through a slip ring or a wireless transmission module, and the real-time shaft power is calculated by combining the data of the optoelectronic speed sensor.

[0004] However, when pasting the strain gauges, due to the influence of the skill differences of operators and environmental interferences (such as vibration and light occlusion), it is easy to cause deviations in the pasting angles of the strain gauges, seriously reducing the torque measurement accuracy; in addition, manual pasting is difficult to ensure the complete adhesion of the strain gauges to the shaft surface, and the adhesive is prone to creep in a humid and hot environment, causing micro-peeling between the strain gauges and the shaft body, further weakening the signal transmission efficiency. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a shaft power detector for a ship's propeller shaft, aiming to solve the above technical problems.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A shaft power detector for a ship's propeller shaft includes a main shaft. Both ends of the outer circumferential surface of the main shaft are fixedly connected with brackets. A protection mechanism is arranged in the middle of the outer side of the main shaft. The protection mechanism includes a semi-circular arc-shaped cover arranged in the middle of the outer side of the main shaft. Both end faces of the semi-circular arc-shaped cover are provided with support plates for cooperating with the brackets. A detection component for detecting the shaft power is arranged on the outer circumferential surface of the main shaft. An adjustment mechanism for adjusting the position of the detection component is arranged on the inner side of the semi-circular arc-shaped cover; Among them, the adjusting mechanism includes a first limiting rod arranged inside the semi-circular cover. Both ends of the first limiting rod are provided with first fixing seats fixedly connected to the semi-circular cover. Inside the first fixing seat, there is a first lead screw flush with the first limiting rod. On one side of the outer circular surface of the first lead screw, there is a first transmission gear fixedly connected. The outer circular surfaces of the first limiting rod and the first lead screw are jointly provided with a support component for providing a supporting force to the detection component. On the outer side of the semi-circular cover, there is a driving mechanism for driving the adjusting mechanism to move, and the closing angle of the support component is adjusted through the adjusting mechanism to change the pasting angle of the detection component.

[0008] As a further solution of the present invention: The support component includes a fixed sleeve seat fixedly connected to the middle of the first limiting rod. At the upper end of the outer circular surface of the fixed sleeve seat, there is a U-shaped seat fixedly connected. Inside the U-shaped seat, there is a connecting plate hinged. One end of the connecting plate is fixedly connected with an auxiliary plate. The outer circular surface of the first limiting rod is slidably connected with a sliding sleeve. On both sides of the outer circular surface of the first lead screw, there are thread rings with opposite directions, and on both sides of the outer circular surface of the first lead screw, there are corresponding threaded seats threadedly connected. A connecting plate is fixedly connected between the threaded seat and the sliding sleeve. On one side of the outer circular surface of the sliding sleeve, there is a support rod hinged to the connecting plate.

[0009] As a further solution of the present invention: The driving mechanism includes an arc-shaped plate jointly sleeved on the outer circular surfaces of the support plate and the semi-circular cover; in the middle of the outer side of the arc-shaped plate, there is an outer semi-tooth plate fixedly connected, and in the middle of the inner side of the arc-shaped plate, there is an inner semi-tooth plate fixedly connected, and the inner semi-tooth plate is meshed with the first transmission gear; on both sides of the outer semi-tooth plate, there are fixing plates fixedly connected to the arc-shaped plate. At both ends inside the outer semi-tooth plate, there are second limiting holes opened. On the outer side of the support plate, there is a driving component for driving the outer semi-tooth plate to rotate.

[0010] As a further solution of the present invention: The driving component includes a servo motor fixedly connected to the outer side of the support plate. The output end of the servo motor is fixedly connected with a driving rod. Near the servo motor end of the driving rod, there is a first gear fixedly connected, and at the end of the driving rod far from the servo motor, there is a second gear fixedly connected; the sizes and structures of the first gear and the second gear are the same, but their positions are different, and they are respectively meshed with the outer semi-tooth plates on both end faces of the semi-circular cover.

[0011] As a further solution of the present invention: bump blocks are fixedly connected to the upper surfaces of the brackets. The protection mechanism further includes first baffles on both sides of the outer surface of the semi-circular arc-shaped cover. A second baffle is fixedly connected to one side of the outer surface of the support plate close to the semi-circular arc-shaped cover. First limiting holes are formed inside the first baffle and the second baffle. Vertical plates are fixedly connected to both sides of the outer surfaces of the first baffle and the second baffle, and the vertical plates are connected by bolts; a clamping groove is formed in the inner top of the support plate, and the support plate is sleeved on the bump block through the clamping groove to be limited.

[0012] As a further solution of the present invention: the detection assembly includes a limiting plate fixedly connected to one side of the outer surface of the auxiliary plate, and the limiting plate forms a 45-degree angle with the auxiliary plate. An airbag is fixedly connected to the inner side of the auxiliary plate, and an air pump for supplying air to the airbag is arranged on the outer side of the auxiliary plate. A pressure sensor is arranged inside the airbag, a detection piece is pasted on the inner side of the airbag, a sensor and a signal receiver are arranged outside the main shaft, and support plates fixedly connected to the semi-circular arc-shaped cover are arranged on the outer surfaces of the sensor and the signal receiver.

[0013] As a further solution of the present invention: ventilation holes are circumferentially formed on the outer circular surface of the semi-circular arc-shaped cover, and ventilation membranes are embedded inside the ventilation holes.

[0014] As a further solution of the present invention: cleaning mechanisms are arranged on both sides of the top of the main shaft. The cleaning mechanism includes a second limiting rod arranged on the top of the main shaft. Second fixing seats fixedly connected to the support plate are arranged on both end faces of the second limiting rod. A second lead screw rotatably connected to the second fixing seat is arranged directly above the second limiting rod. A partition sleeve is fixedly connected to the middle of the second lead screw. Slide plates threadedly connected to the second lead screw are arranged on both sides of the partition sleeve, and the second limiting rod penetrates through the inside of the slide plates; cleaning plates are fixedly connected to the bottoms of the slide plates.

[0015] As a further solution of the present invention: a second transmission gear meshed with the inner half-tooth plate is arranged at one end of the outer circular surface of the second lead screw; and taking the partition sleeve as the boundary, thread circles in opposite directions are formed on both sides of the outer circular surface of the second lead screw.

[0016] As a further solution of the present invention: the transmission ratio of the second transmission gear to the inner half-tooth plate is greater than the transmission ratio of the first transmission gear to the inner half-tooth plate.

[0017] Compared with the prior art, the above technical solutions provided by the present invention have at least the following beneficial effects: In this solution, a protective mechanism, a driving mechanism, and an adjusting mechanism are provided. When performing shaft power detection, two semi-circular covers are connected by bolts to form a sealed cylindrical cover, which is filled with moisture-proof silica gel inside. Combined with the hydrophobic film of the ventilation holes, seawater moisture and oil stains are isolated. The first lead screw is used to drive the threaded seats to move towards each other in a two-way threaded manner, and through the hinge linkage of the support rod and the connecting plate, the detection piece is forced to fit the main shaft precisely at an angle of 45° ± 0.5°, eliminating the angle deviation of manual pasting.

[0018] By setting an adjusting mechanism and a detection component, when the detection component is made to approach and fit the main shaft by using the adjusting mechanism, the air pump is started to fill compressed air into the airbag. After the airbag expands, it pushes the inner detection piece to closely fit the surface of the main shaft. At the same time, the pressure sensor monitors the pressure inside the airbag in real time, and through closed-loop control of the air pressure output of the air pump, it ensures that the contact pressure between the detection piece and the main shaft is constant. Since the limiting plate and the auxiliary plate form an angle of 45°, the detection piece fits the main shaft in an accurate 45° direction, avoiding the angle deviation of traditional manual pasting. And when the main shaft vibrates or thermally expands, the airbag automatically compensates for the gap between the detection piece and the shaft surface through the real-time pressure regulation of the air pump, eliminating the micro-peeling phenomenon.

[0019] By setting a driving mechanism and a cleaning mechanism, during the rotation of the outer half-tooth plate driven by the second gear, the arc plate drives the "inner gear ring" to rotate, which in turn causes the second transmission gear meshed with the "inner gear ring" to rotate, and then drives the fixedly connected second lead screw to rotate in the second fixed seat. During the rotation of the second lead screw, the second limiting rod is used to limit the movement of the sliding plate, so that the sliding plate moves along the movement track of the second limiting rod towards the separating sleeve, and drives the cleaning plate to symmetrically scrape the surface of the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention and, together with the specification, further serve to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a connection schematic diagram of the protective mechanism of the present invention; Figure 3 is a connection schematic diagram of the adjusting mechanism and the main shaft of the present invention; Figure 4 is Figure 2 a partial enlarged view at A in Figure 5 is a schematic diagram of the internal connection of the semi-circular cover of the present invention; Figure 6 is a split connection schematic diagram of the protective mechanism of the present invention; Figure 7 Schematic connection diagram of the protection mechanism of the present invention; Figure 8 is Figure 7 Partial enlarged view at position B in Figure 9 Schematic connection diagram of the adjustment mechanism and the sensor of the present invention; Figure 10 Schematic structural diagram of the cleaning mechanism of the present invention.

[0022] Reference numerals: 1, main shaft; 2, bracket; 21, convex block; 3, protection mechanism; 31, semi-circular arc cover; 32, ventilation hole; 33, first baffle; 34, support plate; 35, second baffle; 36, vertical plate; 37, card slot; 38, first limit hole; 4, drive mechanism; 41, servo motor; 42, drive rod; 43, first gear; 44, second gear; 45, arc plate; 46, outer semi-tooth plate; 47, second limit hole; 48, fixed plate; 49, inner semi-tooth plate; 5, adjustment mechanism; 51, first limit rod; 52, first fixed seat; 53, first lead screw; 54, first transmission gear; 55, fixed sleeve seat; 56, U-shaped seat; 57, connecting plate; 58, auxiliary plate; 59, sliding sleeve; 510, threaded seat; 511, support rod; 6, limit plate; 7, airbag; 8, air pump; 9, detection piece; 10, sensor; 11, signal receiver; 12, support plate; 13, cleaning mechanism; 131, second limit rod; 132, second fixed seat; 133, second lead screw; 134, separating sleeve; 135, sliding plate; 136, cleaning plate; 137, second transmission gear.

[0023] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic purposes and is not intended to limit the present invention to this specific structure, device and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed implementation manners

[0024] The following describes in detail a shaft power detector for a ship propeller shaft provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. Those skilled in the art can also implement some well-known technologies in other alternative ways; moreover, the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.

[0025] AsFigures 1 to 10 As shown in the figure, an axial power detector for a ship propeller shaft provided by an embodiment of the present invention includes a main shaft 1. Brackets 2 are fixedly connected to both ends of the outer cylindrical surface of the main shaft 1. A protection mechanism 3 is arranged in the middle of the outer side of the main shaft 1. The protection mechanism 3 includes a semi-circular arc-shaped cover 31 arranged in the middle of the outer side of the main shaft 1. Support plates 34 for cooperating with the brackets 2 are arranged on both end faces of the semi-circular arc-shaped cover 31. A detection component for detecting the axial power is arranged on the outer cylindrical surface of the main shaft 1. An adjustment mechanism 5 for adjusting the position of the detection component is arranged inside the semi-circular arc-shaped cover 31; Among them, the adjustment mechanism 5 includes a first limit rod 51 arranged inside the semi-circular arc-shaped cover 31. First fixing seats 52 fixedly connected to the semi-circular arc-shaped cover 31 are arranged at both ends of the first limit rod 51. A first lead screw 53 flush with the first limit rod 51 is arranged inside the first fixing seat 52. A first transmission gear 54 is fixedly connected to one side of the outer cylindrical surface of the first lead screw 53. A support component for providing a supporting force for the detection component is jointly arranged on the outer cylindrical surfaces of the first limit rod 51 and the first lead screw 53; A driving mechanism 4 for driving the adjustment mechanism 5 to move is arranged on the outer side of the semi-circular arc-shaped cover 31, and the closing angle of the support component is adjusted through the adjustment mechanism 5 to change the pasting angle of the detection component.

[0026] As Figure 5 、 Figure 9 shown, the support component includes a fixed sleeve seat 55 fixedly connected to the middle of the first limit rod 51. A U-shaped seat 56 is fixedly connected to the upper end of the outer cylindrical surface of the fixed sleeve seat 55. A connecting plate 57 is hinged inside the U-shaped seat 56. An auxiliary plate 58 is fixedly connected to one end of the connecting plate 57. A sliding sleeve 59 is slidably connected to the outer cylindrical surface of the first limit rod 51. Threaded circles with opposite directions are arranged on both sides of the outer cylindrical surface of the first lead screw 53, and threaded seats 510 are correspondingly threadedly connected to both sides of the outer cylindrical surface of the first lead screw 53. A connecting plate is jointly fixedly connected between the threaded seats 510 and the sliding sleeve 59. A support rod 511 hinged to the connecting plate 57 is arranged on one side of the outer cylindrical surface of the sliding sleeve 59.

[0027] As Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 shown, the driving mechanism 4 includes an arc-shaped plate 45 jointly sleeved on the outer cylindrical surfaces of the support plate 34 and the semi-circular arc-shaped cover 31; An outer semi-tooth plate 46 is fixedly connected to the middle of the outer side of the arc-shaped plate 45, and an inner semi-tooth plate 49 is fixedly connected to the middle of the inner side of the arc-shaped plate 45, and the inner semi-tooth plate 49 is meshed with the first transmission gear 54; Fixing plates 48 fixedly connected to the arc-shaped plate are arranged on both sides of the outer semi-tooth plate 46. Second limit holes 47 are opened at both ends inside the outer semi-tooth plate 46. A driving component for driving the outer semi-tooth plate 46 to rotate is arranged on the outer side of the support plate 34.

[0028] As Figure 2 , Figure 4 , Figure 5 shown, the driving assembly includes a servo motor 41 fixedly connected to the outside of the pallet 34. The output end of the servo motor 41 is fixedly connected to a driving rod 42. One end of the driving rod 42 close to the servo motor 41 is fixedly connected to a first gear 43, and the end of the driving rod 42 away from the servo motor 41 is fixedly connected to a second gear 44. The first gear 43 and the second gear 44 are identical in size and structure, but their positions are different, and they are respectively meshed with the outer half-tooth plates 46 on both end faces of the semi-circular cover 31.

[0029] As Figure 1 , Figure 2 , Figure 5 shown, bumpers 21 are fixedly connected to the upper surfaces of the brackets 2. The protection mechanism 3 further includes first baffles 33 on both sides of the outer surface of the semi-circular cover 31. A second baffle 35 is fixedly connected to one side of the outer surface of the pallet 34 close to the semi-circular cover 31. First limit holes 38 are formed in the interiors of the first baffles 33 and the second baffles 35. Vertical plates 36 are fixedly connected to both sides of the outer surfaces of the first baffles 33 and the second baffles 35, and the vertical plates 36 are connected by bolts. A card slot 37 is formed in the inner top of the pallet 34, and the pallet 34 is sleeved on the bumpers 21 through the card slot 37 for positioning.

[0030] To solve the problem that when pasting strain gauges, due to the influence of differences in the skills of operators and environmental interference, the pasting angle of the strain gauges is prone to deviation, seriously reducing the torque measurement accuracy and weakening the signal transmission efficiency. Now, the above technical solution is adopted to solve this problem. The above technical solution mainly consists of a bracket 2, a protection mechanism 3, a driving mechanism 4, and an adjustment mechanism 5. When detecting the shaft power, first, use bolts to fixedly connect the first baffle 33 and the second baffle 35, so that the support plate 34 is fixedly connected to the semi-circular cover 31. Then, the slot 37 of the support plate 34 is sleeved on the convex block 21. After preliminary fixation, use bolts and nuts again to fixedly connect the two semi-circular covers 31 to form a complete cylindrical barrel cover, and the support plates 34 on both sides also correspondingly form a cylinder. Then, use bolts to pass through the fixed plate 48, so that the two outer semi-tooth plates 46 together form an external tooth ring, and the two inner semi-tooth plates 49 together form an internal tooth ring. Then, pull out the bolts for fixing the outer semi-tooth plate 46 from the first limit hole 38 and the second limit hole 47 to facilitate the rotation of the external tooth ring and the internal tooth ring. At this time, the so-called "external tooth ring" is sleeved in the circular ring track formed by the support plate 34 and the semi-circular cover 31. After the semi-circular cover 31 is fixed, start the servo motor 41 to rotate forward, so that the driving rod 42 rotates, thereby causing the first gear 43 to rotate. The "external tooth ring" meshing with the first gear 43 rotates in the circular ring track, and its position is blocked to a certain extent by the first baffle 33 and the second baffle 35 to ensure the stable rotation of the "external tooth ring". During the rotation of the "external tooth ring", the arc plate 45 drives the "internal tooth ring" to rotate, thereby causing the first transmission gear 54 meshing with the "internal tooth ring" to rotate, and further driving the fixedly connected first lead screw 53 to rotate in the first fixed seat 52. Since the two sides of the outer cylindrical surface of the first lead screw 53 are provided with thread coils in opposite directions, during the rotation of the first lead screw 53, the thread seat 510 approaches the middle of the first limit rod 51 under the action of the receiving plate and the sliding sleeve 59. At the same time, the connecting plate 57 is driven to open outward by the support rod 511, so that the auxiliary plate 58 approaches the main shaft 1 until the detection assembly fits against the outer cylindrical surface of the main shaft 1, ensuring that the detection assembly will not have an angular deviation due to manual pasting by humans, thereby improving the accuracy of detecting the shaft power of the main shaft 1.

[0031] During the above operation process, the semi-circular cover 31 and the first baffle 33 and the second baffle 35 form a sealed cavity, which is filled with a moisture-proof silica gel layer inside to isolate seawater moisture and oil stains. When the main shaft 1 undergoes thermal expansion due to load changes, the composite structure of the first limiting rod 51 and the first lead screw 53 automatically compensates for the axial deformation through the fine adjustment of the threaded seat 510 to maintain close contact between the detection component and the surface of the main shaft 1. At the same time, during the process of measuring the shaft power, through the driving mechanism 4 and the adjusting mechanism 5, two symmetrical full-bridge circuits formed by "4 strain gauges symmetrically pasted along the 45° or 135° direction on the surface of the propeller shaft" are attached to the main shaft 1, and the bending or axial interference is cancelled through the differential signal to improve the torque measurement accuracy.

[0032] As Figure 3 , Figure 6 , Figure 9 shown, the detection component includes a limiting plate 6 fixedly connected to one side of the outer surface of the auxiliary plate 58, and the limiting plate 6 forms a 45-degree angle with the auxiliary plate 58. An airbag 7 is fixedly connected to the inner side of the auxiliary plate 58, and an air pump 8 for supplying air to the airbag 7 is arranged on the outer side of the auxiliary plate 58. A pressure sensor is arranged inside the airbag 7, a detection piece 9 is pasted on the inner side of the airbag 7, a sensor 10 and a signal receiver 11 are arranged outside the main shaft 1, and support plates 12 fixedly connected to the semi-circular cover 31 are arranged on the outer surfaces of the sensor 10 and the signal receiver 11.

[0033] As Figure 2 shown, ventilation holes 32 are circumferentially formed on the outer circular surface of the semi-circular cover 31, and ventilation membranes are embedded inside the ventilation holes 32.

[0034] When using the adjusting mechanism 5 to make the detection component approach and fit the main shaft 1, by starting the air pump 8, compressed air is filled into the airbag 7. After the airbag 7 expands, it pushes the inner detection piece 9 to closely fit the surface of the main shaft 1. At the same time, the pressure sensor monitors the internal pressure of the airbag 7 in real time, and through closed-loop control of the air pressure output of the air pump 8, it ensures that the contact pressure between the detection piece 9 and the main shaft 1 is constant. Since the limiting plate 6 and the auxiliary plate 58 form a 45° angle, the detection piece 9 fits the main shaft 1 at an accurate 45° angle, avoiding the angular deviation of traditional manual pasting. When the main shaft 1 undergoes torsional deformation due to torque, the detection piece 9 converts mechanical deformation into resistance change through a surface strain-sensitive layer such as metal foil or semiconductor material. When the main shaft 1 vibrates or thermally expands, the airbag 7 automatically compensates for the gap between the detection piece 9 and the shaft surface through real-time pressure regulation of the air pump 8, eliminating the micro-peeling phenomenon; and the electrical signal output by the detection piece 9 is collected by the sensor 10 and wirelessly transmitted to the data processing terminal through the signal receiver 11. And during the entire detection process, the support plate 12 provides rigid fixation for the sensor 10 and the signal receiver 11 to ensure the stability of signal transmission. At the same time, the breathable holes 32 of the semi-circular cover 31 are embedded with a hydrophobic breathable membrane with a pore diameter of (0.1 μm), which balances the air pressure inside and outside the protective cover, while blocking the intrusion of seawater moisture and oil stains, avoiding signal drift; and by combining the strain signal of the detection piece 9 and the rotational speed data of the main shaft 1, the shaft power of the paddle shaft is measured in real time.

[0035] And during the entire shaft power detection process, to abandon the traditional epoxy resin encapsulation process, the detection piece 9 is fixed in a non-bonded manner through the pressure of the airbag 7, avoiding signal attenuation caused by the creep of the adhesive, and extending the maintenance cycle. Moreover, the detection piece 9 and the airbag 7 are connected by a snap connection, significantly shortening the replacement time and improving work efficiency. And a pressure sensor is installed inside the airbag 7, and the pressure sensor can be used to monitor abnormal pressure fluctuations of the airbag 7 to give early warning of wear or detachment of the detection piece 9.

[0036] As Figure 3 、 Figure 6 、 Figure 10 shown, cleaning mechanisms 13 are arranged on both sides of the top of the main shaft 1. The cleaning mechanism 13 includes a second limiting rod 131 arranged on the top of the main shaft 1. Second fixing seats 132 fixedly connected to the support plate 34 are arranged on both end faces of the second limiting rod 131. A second lead screw 133 rotatably connected to the second fixing seat 132 is arranged directly above the second limiting rod 131. A partition sleeve 134 is fixedly connected to the middle of the second lead screw 133. Slide plates 135 threadedly connected to the second lead screw 133 are arranged on both sides of the partition sleeve 134, and the second limiting rod 131 passes through the inside of the slide plate 135; cleaning plates 136 are fixedly connected to the bottoms of the slide plates 135.

[0037] As Figure 3 、 Figure 6 、Figure 10 As shown, at one end of the outer cylindrical surface of the second lead screw 133, there is a second transmission gear 137 meshed and connected with the inner half-tooth plate 49; and with the spacer sleeve 134 as the boundary, thread rings in opposite directions are provided on both sides of the outer cylindrical surface of the second lead screw 133.

[0038] As Figure 3 , Figure 6 , Figure 10 As shown, the transmission ratio of the second transmission gear 137 to the inner half-tooth plate 49 is greater than the transmission ratio of the first transmission gear 54 to the inner half-tooth plate 49.

[0039] When the detection component is attached to the main shaft 1 by using the adjustment mechanism 5, the servo motor 41 is started to rotate forward, and the driving rod 42 drives the first gear 43 and the second gear 44 to rotate synchronously. Since the two gears are meshed with the outer half-tooth plate 46, the outer half-tooth plate 46 is driven to rotate in the annular track formed by the support plate 34 and the semi-circular cover 31. During the process of the second gear 44 driving the outer half-tooth plate 46 to rotate, the arc plate 45 drives the "inner gear ring" to rotate, so that the second transmission gear 137 meshed and connected with the "inner gear ring" rotates, and then drives the fixedly connected second lead screw 133 to rotate in the second fixed seat 132. During the rotation of the second lead screw 133, the second limiting rod 131 is used to limit the position of the sliding plate 135, so that the sliding plate 135 approaches the spacer sleeve 134 along the movement track of the second limiting rod 131, and drives the cleaning plate 136 to symmetrically scrape the surface of the main shaft 1. Since the transmission ratio of the first transmission gear 54 to the inner half-tooth plate 49 is 1:1, and the transmission ratio of the second transmission gear 137 of the cleaning mechanism 13 to the inner half-tooth plate 49 is 3:1, the speed decoupling of the detection and cleaning actions is realized. During the cleaning process of the surface of the main shaft 1, the inner half-tooth plate 49 drives the second transmission gear 137 to drive the second lead screw 133 at 1 / 3 of the rotation speed of the main shaft 1; the reverse threads on both sides push the sliding plate 135 to slide reversely along the second limiting rod 131, driving the cleaning plate 136 to symmetrically scrape the surface of the main shaft 1; at the same time, the pressure of the cleaning plate 136 can be changed by adjusting the rotation speed of the servo motor 41 to adapt to different dirt such as sludge and marine organisms.

[0040] When the present invention is in use, first, the first baffle 33 and the second baffle 35 are fixedly connected by bolts, so that the support plate 34 is fixedly connected to the semi-circular arc-shaped cover 31. Then, the card slot 37 of the support plate 34 is sleeved on the convex block 21. After preliminary fixation, the two semi-circular arc-shaped covers 31 are fixedly connected by bolts and nuts again to form a complete cylindrical barrel cover, and the support plates 34 on both sides thereof also correspondingly form a cylinder. Then, bolts are passed through the fixing plate 48 so that the two outer semi-tooth plates 46 together form an outer tooth ring, and the two inner semi-tooth plates 49 together form an inner tooth ring. Then, the bolts for fixing the outer semi-tooth plates 46 are drawn out from the first limit hole 38 and the second limit hole 47 to facilitate the rotation of the outer tooth ring and the inner tooth ring. At this time, the so-called "outer tooth ring" is sleeved in the circular ring track formed by the support plate 34 and the semi-circular arc-shaped cover 31. After the semi-circular arc-shaped cover 31 is fixedly completed, the servo motor 41 is started to rotate forward, so that the driving rod 42 drives the first gear 43 and the second gear 44 to rotate synchronously. The two gears are engaged with the outer semi-tooth plate 46 to drive the outer semi-tooth plate 46 to rotate in the circular ring track formed by the support plate 34 and the semi-circular arc-shaped cover 31. During the rotation of the outer semi-tooth plate 46, the arc-shaped plate 45 drives the "inner tooth ring" to rotate, so that the first transmission gear 54 engaged with the "inner tooth ring" rotates, and further drives the fixedly connected first lead screw 53 to rotate in the first fixed seat 52. And because the transmission ratio of the first transmission gear 54 to the inner semi-tooth plate 49 is 1:1, and the transmission ratio of the second transmission gear 137 of the cleaning mechanism 13 to the inner semi-tooth plate 49 is 3:1, the speed decoupling of the detection and cleaning actions is realized. When the first lead screw 53 rotates, the reverse threads on both sides thereof drive the threaded seats 510 to move towards or away from each other. Through the rigid connection between the receiving plate and the sliding sleeve 59, the support rod 511 is driven to push the connecting plate 57 to swing around the hinge point of the U-shaped seat 56, and finally the auxiliary plate 58 is accurately attached to the surface of the main shaft 1 at an angle of 45°. At the same time, the air pump 8 is used to fill the airbag 7 with compressed air to push the detection piece 9 to be in close contact with the surface of the main shaft 1, and the internal pressure is monitored in real time by the pressure sensor, and the air pressure is dynamically adjusted to compensate for the gap caused by thermal expansion or vibration. And the metal foil strain gauge on the surface of the detection piece 9 converts the torsional deformation of the main shaft into a change in resistance, and outputs a differential voltage signal through the Wheatstone full bridge circuit. To ensure that the detection environment does not interfere with the detection result, moisture-proof silica gel is filled inside the semi-circular arc-shaped cover 31, and the hydrophobic film pore diameter (0.1 μm) of the air vent hole 32 is used to balance the air pressure and block the salt spray; and the strain signal collected by the sensor 10 is wirelessly transmitted by the signal receiver 11 to avoid the interference of slip ring friction.

[0041] The present invention covers any alternatives, modifications, equivalent methods and solutions made to the essence and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, well-known methods, processes, procedures, components and circuits, etc. are not described in detail in order to avoid unnecessary confusion to the essence of the present invention.

[0042] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A shaft power detector for a ship propeller shaft, comprising a main shaft, characterized in that: Both ends of the outer cylindrical surface of the main shaft are fixedly connected with brackets, and a protective mechanism is arranged in the middle of the outer side of the main shaft, the protective mechanism includes a semicircular arc cover arranged in the middle of the outer side of the main shaft, and both end surfaces of the semicircular arc cover are provided with support plates used in conjunction with the bracket, and a detection component for detecting shaft power is arranged on the outer cylindrical surface of the main shaft, and an adjustment mechanism for adjusting the position of the detection component is arranged on the inner side of the semicircular arc cover; Wherein, the adjustment mechanism includes a first limit rod arranged on the inner side of the semicircular arc cover, both ends of the first limit rod are provided with a first fixing seat fixedly connected to the semicircular arc cover, the inner side of the first fixing seat is provided with a first screw rod flush with the first limit rod, one side of the outer cylindrical surface of the first screw rod is fixedly connected with a first transmission gear, and the first limit rod and the outer cylindrical surface of the first screw rod are jointly provided with a support component for providing support force for the detection component; A driving mechanism for driving the adjustment mechanism to move is arranged on the outer side of the semicircular arc cover, and the closing angle of the supporting component is adjusted through the adjustment mechanism to change the sticking angle of the detection component.

2. A shaft power detector for a ship propeller shaft according to claim 1, characterized in that: The supporting assembly includes a fixed sleeve seat fixedly connected to the middle of the first limiting rod, a U-shaped seat is fixedly connected to the upper end of the outer cylindrical surface of the fixed sleeve seat, a connecting plate is hingedly connected to the inside of the U-shaped seat, one end of the connecting plate is fixedly connected to an auxiliary plate, a sliding sleeve is slidably connected to the outer cylindrical surface of the first limiting rod, threaded rings in opposite directions are arranged on both sides of the outer cylindrical surface of the first screw rod, and threaded seats are correspondingly connected to the threads on both sides of the outer cylindrical surface of the first screw rod, a receiving plate is fixedly connected between the threaded seat and the sliding sleeve, and a support rod hingedly connected to the connecting plate is arranged on one side of the outer cylindrical surface of the sliding sleeve.

3. The shaft power detector of a ship propeller shaft according to claim 2, characterized in that: The driving mechanism includes an arc-shaped plate which is jointly sleeved on the support plate and the outer circumferential surface of the semicircular cover; an outer half-tooth plate is fixedly connected to the middle of the outer side of the arc-shaped plate, and an inner half-tooth plate is fixedly connected to the middle of the inner side of the arc-shaped plate, and the inner half-tooth plate is meshingly connected to the first transmission gear; fixing plates fixedly connected to the arc-shaped plate are arranged on both sides of the outer half-tooth plate, and second limiting holes are opened at both ends of the inner side of the outer half-tooth plate, and a driving component for driving the outer half-tooth plate to rotate is arranged on the outer side of the support plate.

4. The shaft power detector of a ship propeller shaft according to claim 3, characterized in that: The driving assembly includes a servo motor fixedly connected to the outer side of the support plate, the output end of the servo motor is fixedly connected to a driving rod, the end of the driving rod close to the servo motor is fixedly connected to a first gear, and the end of the driving rod away from the servo motor is fixedly connected to a second gear; the first gear and the second gear have the same size and structure, but their positions are different, and are respectively meshed and connected with the outer half-toothed plates on the two end surfaces of the semicircular arc cover.

5. The shaft power detector of a ship propeller shaft according to claim 4, characterized in that: The upper surface of the bracket is fixedly connected with a protrusion, and the protective mechanism also includes a first baffle on both sides of the outer surface of the semicircular cover, and a second baffle is fixedly connected to the side of the outer surface of the bracket close to the semicircular cover, and the first baffle and the second baffle are each provided with a first limiting hole inside, and the outer surfaces of the first baffle and the second baffle are fixedly connected with a vertical plate on both sides, and the vertical plates are connected by bolts; a slot is provided on the top of the bracket, and the bracket is sleeved on the protrusion through the slot to be limited.

6. The shaft power detector of a ship propeller shaft according to claim 5, characterized in that: The detection component includes a limit plate fixedly connected to one side of the outer surface of the auxiliary plate, and the limit plate and the auxiliary plate form an angle of 45 degrees, an airbag is fixedly connected to the inner side of the auxiliary plate, and an air pump for supplying air to the airbag is provided on the outer side of the auxiliary plate, a pressure sensor is provided inside the airbag, a detection sheet is pasted on the inner side of the airbag, a sensor and a signal receiver are provided on the outer side of the main shaft, and the outer surfaces of the sensor and the signal receiver are provided with a support plate fixedly connected to the semicircular arc cover.

7. The shaft power detector of a ship propeller shaft according to claim 6, characterized in that: The outer circumferential surface of the semicircular arc cover is surrounded by ventilation holes, and the insides of the ventilation holes are all embedded with ventilation films.

8. The shaft power detector of a ship propeller shaft according to claim 7, characterized in that: Cleaning mechanisms are provided on both sides of the top of the main shaft, and the cleaning mechanisms include a second limiting rod arranged on the top of the main shaft, and second fixed seats fixedly connected to the support plate are provided on both end surfaces of the second limiting rod, and a second screw rod rotatably connected to the second fixed seat is provided directly above the second limiting rod, a separating sleeve is fixedly connected to the middle of the second screw rod, and slides threadedly connected to the second screw rod are provided on both sides of the separating sleeve, and the second limiting rod runs through the interior of the slide; a cleaning plate is fixedly connected to the bottom of the slide.

9. The shaft power detector of a ship propeller shaft according to claim 8, characterized in that: A second transmission gear meshing with the inner half tooth plate is arranged at one end of the outer cylindrical surface of the second screw rod; and threaded circles in opposite directions are arranged on both sides of the outer cylindrical surface of the second screw rod with the separation sleeve as the boundary.

10. The shaft power detector of a ship propeller shaft according to claim 9, characterized in that: The transmission ratio of the second transmission gear to the inner half gear plate is greater than the transmission ratio of the first transmission gear to the inner half gear plate.

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