A pitch feedback mechanism

Abstract

A pitch feedback mechanism, the pitch feedback mechanism includes support, two guide rods, slider, transmission sprocket assembly, tension sprocket assembly, support sprocket assembly and roller assembly, the support includes two vertical frame and horizontal frame, two vertical frame bottom between being provided with horizontal frame;Two guide rods are arranged side by side between the two vertical frames, the slider is slidably connected with the two guide rods, the top of the slider is connected with the bottom of the feedback ring;Push-pull rod is arranged on the side of the feedback ring, a group of roller assemblies are arranged on the front and back sides of the feedback ring respectively, the roller assemblies are connected with the slider, the bottom of the slider is connected with the top of the chain card, and the chain card is engaged with the chain.The pitch potentiometer and the pitch scale plate of the design pitch feedback mechanism can indicate the pitch angle mechanical displacement in real time, and the pitch angle electrical signal is fed back synchronously, so that the pitch closed-loop control is realized.

Description

Technical Field

[0001] This invention relates to an improvement in the pitch feedback mechanism technology of a pitch control propeller device, belonging to the field of pitch control propeller devices, and particularly to a pitch feedback mechanism. Background Technology

[0002] Controllable pitch propellers are an important component of marine propulsion systems. By matching the pitch with the main engine speed, they can fully absorb the main engine power, resulting in high economic efficiency. Through forward and reverse pitch adjustment, they can enable the ship to sail and reverse without changing the shaft direction, providing high maneuverability. The pitch adjustment process of the controllable pitch propeller involves the coordinated operation of the electromechanical, hydraulic, and electromechanical systems. The electro-control system sends a command signal, and the hydraulic system's solenoid directional valve executes the corresponding action to switch the oil circuit. Hydraulic oil enters the pitch cylinder, driving the crank-slider mechanism to change the propeller blade pitch angle. The feedback device is used to indicate the propeller blade pitch angle and simultaneously transmits the pitch angle feedback signal to the electro-control system until the feedback signal matches the command signal, completing one pitch closed-loop control cycle. However, current feedback devices cannot provide accurate real-time pitch feedback.

[0003] Chinese patent application CN201810642264.5, filed on June 21, 2018, discloses a non-contact transmission indicating mechanism for pitch feedback of a ship's controllable pitch propeller. The feedback ring is mounted on the controllable pitch propeller shaft system and rigidly connected to an axially movable component inside the shaft system. When the controllable pitch propeller adjusts the pitch during operation, the feedback ring rotates with the shaft system and simultaneously translates along the axial direction with the axially movable component inside the shaft system. The non-contact transmission indicating mechanism uses bolts to fix the mounting bracket to the hull plate. During installation, it is ensured that the propeller blade pitch is in a vertical position. The position of the mounting bracket is adjusted to ensure that the width center plane of the crank and the thickness center plane of the feedback ring are on the same plane. However, the prior art does not solve the problem that current feedback devices cannot provide accurate pitch feedback in real time.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this patent application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem that feedback devices in the prior art cannot provide accurate real-time feedback of pitch, and to provide a pitch feedback mechanism that can provide accurate real-time feedback of pitch.

[0006] To achieve the above objectives, the technical solution of the present invention is: a pitch feedback mechanism, the pitch feedback mechanism comprising a bracket, two guide rods, a slider, a transmission sprocket assembly, a tensioning sprocket assembly, a support sprocket assembly and a roller assembly, the bracket comprising two vertical frames and a horizontal frame, the horizontal frame being disposed between the bottoms of the two vertical frames;

[0007] Two guide rods are arranged side by side between the two vertical frames. The slider slides with the two guide rods, and the top of the slider is connected to the bottom of the feedback loop.

[0008] The feedback ring is provided with a push-pull rod on its side, and a set of roller assemblies is provided on each of the front and rear sides of the feedback ring. The roller assemblies are connected to the slider, the bottom of the slider is connected to the top of the chain card, and the chain card is engaged with the chain.

[0009] The horizontal frame is provided with a support sprocket assembly, a tension sprocket assembly and a transmission sprocket assembly arranged from left to right below the guide rod. The support sprocket assembly, the tension sprocket assembly and the transmission sprocket assembly are connected by a chain. The bottom of the transmission sprocket assembly is connected to the top of the pitch potentiometer. The pitch potentiometer is connected to the control unit signal.

[0010] A pointer is mounted on the back of the slider, and a pitch scale plate is mounted on the back of the transverse frame below the pointer.

[0011] A U-shaped area is formed between the two vertical frames and the horizontal frame;

[0012] The guide rod is positioned between two vertical frames. The top of the horizontal frame has a first mounting slot, a second mounting slot, and a third mounting slot in sequence. The support sprocket assembly is installed in the first mounting slot, the tensioning sprocket assembly is installed in the second mounting slot, and the support sprocket assembly is installed in the third mounting slot.

[0013] The bottom of the transverse frame is equipped with a mounting platform, which is connected to the hull by fixing bolts.

[0014] The top of the slider has a slot, in which an eccentric shaft is embedded. Two sets of roller assemblies are set on the side of the eccentric shaft. The top of the eccentric shaft has a through hole, and the top of the slider has a connecting hole that communicates with the through hole. A screw is threaded into the through hole, and the screw passes through the eccentric shaft to fix the roller assembly to the slider.

[0015] The slider has two sliding holes on its side corresponding to the two guide rods, and each guide rod slides into the corresponding sliding hole.

[0016] The eccentric shaft includes an upper end, a middle section and a lower end. The bottom of the upper end is connected to the top of the middle section, and the bottom of the middle section is connected to the top of the lower end. A through hole passes through the upper end, the middle section and the lower end in sequence. The upper end is connected to the roller assembly and the lower end is embedded in the slot.

[0017] The diameters of the middle section, upper end, and lower end show a decreasing trend.

[0018] The side of the tension sprocket assembly is provided with washers located below the transverse frame, and the two sides of the washers are threadedly connected to the transverse frame by mounting bolts.

[0019] The top of the transverse frame has an installation port corresponding to the two mounting bolts, and the bottom of the washer has a connection port corresponding to the two installation ports. One end of each mounting bolt passes through the corresponding connection port and installation port to fix the washer to the transverse frame.

[0020] The bottom of the washer is located between the two mounting holes and is connected and fixed to the tension sprocket assembly by a fastening nut.

[0021] The transmission sprocket assembly includes a sprocket, a sprocket shaft, and a sprocket drive component. The side of the sprocket is connected to the support sprocket assembly and the tension sprocket assembly via a chain. The bottom of the sprocket is connected to the top of the sprocket shaft. The sprocket drive component is embedded in three mounting slots. The sprocket shaft is located inside the sprocket drive component. The bottom of the sprocket drive component is connected to the top of the pitch potentiometer.

[0022] The front of the sprocket drive component has multiple sets of symmetrically distributed bearings on the left and right sides of the sprocket shaft.

[0023] The bottom of the sprocket drive component is equipped with a retaining ring, and the top left and right ends of the retaining ring are connected to the bottom of the transverse frame by two fixing screws.

[0024] The bottom of the retaining ring is fitted with a pressure cap, and the bottom of the pressure cap is connected to the top of the pitch potentiometer.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. In the pitch feedback mechanism of this invention, a pitch scale plate is mounted on the back of the bracket below the pointer. From left to right, a support sprocket assembly, a tension sprocket assembly, and a transmission sprocket assembly are sequentially arranged on the bracket below the guide rod. These sprocket assemblies are connected by a chain. The bottom of the transmission sprocket assembly is connected to the top of the pitch potentiometer. The pitch feedback mechanism, composed of the pitch potentiometer and the pitch scale plate, can indicate the mechanical displacement of the pitch angle in real time and synchronously feed back the pitch angle electrical signal, realizing closed-loop pitch control. Therefore, this design provides real-time indication of the mechanical displacement of the pitch angle and is simple to operate.

[0027] 2. In the pitch feedback mechanism of this invention, a slot is provided on the top of the slider, and an eccentric shaft is embedded in the slot. Two sets of roller assemblies are set on the side of the eccentric shaft. A through hole is provided on the top of the eccentric shaft, and a connecting hole communicating with the through hole is provided on the top of the slider. A screw is threaded into the through hole, and the screw passes through the eccentric shaft to fix the roller assembly to the slider. The eccentricity of the eccentric shaft is adjusted by the screw, thereby adjusting the distance between the two sets of roller assemblies to adapt to feedback loops with different thicknesses and gap requirements. This design has high versatility and adaptability. Therefore, this design has strong adjustability and a wide range of adaptability.

[0028] 3. In the pitch feedback mechanism of this invention, the transmission sprocket assembly includes a sprocket, a sprocket shaft, and a sprocket drive component. The side of the sprocket is connected to a support sprocket assembly and a tension sprocket assembly via a chain. The bottom of the sprocket is connected to the top of the sprocket shaft. The sprocket drive component is embedded in three mounting slots, and the sprocket shaft is located within the sprocket drive component. The bottom of the sprocket drive component is connected to the top of a pitch potentiometer. The transmission sprocket assembly and the support sprocket assembly are arranged at the left and right ends of the transverse frame, serving to support the chain. The tension sprocket assembly is arranged in the middle and can be moved up and down by adjusting the fastening nut and two mounting bolts to adjust the chain tension. The adjustable chain tension accurately controls the consistency between mechanical displacement and electrical signal, resulting in high feedback accuracy. Therefore, this design is easy to adjust and has high feedback accuracy. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 This is a side cross-sectional view of the slider in this invention.

[0031] Figure 3 This is a rear view of the present invention.

[0032] Figure 4 This is a schematic diagram of the tension sprocket assembly in this invention.

[0033] Figure 5 This is a schematic diagram of the transmission sprocket assembly in this invention.

[0034] Figure 6 This is a connection diagram of the control system in this invention.

[0035] In the diagram: 1. Bracket 101, Vertical bracket 102, Horizontal bracket 102, Second mounting slot 103, Mounting port 104, Third mounting slot 105, First mounting slot 106, Two guide rods 2, Mounting platform 21, U-shaped area 22, Slider 3, Sliding hole 31, Connecting hole 32, Slot 33, Chain clip 4, Chain 5, Transmission sprocket assembly 6, Sprocket 61, Sprocket shaft 62, Bearing 63, Sprocket drive component 64, Fixing bolt 7, Pitch potentiometer 8, Tension sprocket assembly 9, Support sprocket assembly 10, Roller assembly 11, Eccentric shaft 12, Upper end 121, Middle section 122, Lower end 123, Through hole 124, Screw 13, Pointer 14, Pitch scale plate 15, Washer 16, Connecting port 161, Fastening nut 162, Feedback ring 17, Push-pull rod 18, Retaining ring 19, Pressure cap 20, Control unit 23. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] See Figures 1 to 6 A pitch feedback mechanism includes a bracket 1, two guide rods 2, a slider 3, a transmission sprocket assembly 6, a tension sprocket assembly 9, a support sprocket assembly 10, and a roller assembly 11. The bracket 1 includes two vertical frames 101 and a horizontal frame 102, with the horizontal frame 102 disposed between the bottoms of the two vertical frames 101.

[0038] Two guide rods 2 are arranged side by side between the two vertical frames 101. The slider 3 is slidably engaged with the two guide rods 2. The top of the slider 3 is connected to the roller assembly 11.

[0039] A push-pull rod 18 is provided on the side of the feedback ring 17, and a set of roller assemblies 11 are provided on the front and rear sides of the feedback ring 17. The bottom of the slider 3 is connected to the top of the chain card 4, and the chain card 4 is engaged with the chain 5.

[0040] The horizontal frame 102 is provided with a support sprocket assembly 10, a tension sprocket assembly 9 and a transmission sprocket assembly 6 arranged sequentially from left to right below the guide rod 2. The support sprocket assembly 10, the tension sprocket assembly 9 and the transmission sprocket assembly 6 are connected by a chain 5. The bottom of the transmission sprocket assembly 6 is connected to the top of the pitch potentiometer 8. The pitch potentiometer 8 is signal connected to the control unit 23.

[0041] A pointer 14 is mounted on the back of the slider 3, and a pitch scale plate 15 is mounted on the back of the transverse frame 102 below the pointer 14.

[0042] A U-shaped area 22 is formed between the two vertical frames 101 and the horizontal frame 102;

[0043] The guide rod 2 is disposed between two vertical frames 101. The top of the horizontal frame 102 is sequentially provided with a first mounting groove 106, a second mounting groove 103 and a third mounting groove 105. The support sprocket assembly 10 is installed in the first mounting groove 106, the tensioning sprocket assembly 9 is installed in the second mounting groove 103 and the support sprocket assembly 10 is installed in the third mounting groove 105.

[0044] The bottom of the transverse frame 102 is equipped with a mounting platform 21, which is connected to the hull by fixing bolts 7.

[0045] The top of the slider 3 is provided with a slot 33, and an eccentric shaft 12 is embedded in the slot 33. Two sets of roller assemblies 11 are set on the side of the eccentric shaft 12. The top of the eccentric shaft 12 is provided with a through hole 124. The top of the slider 3 is provided with a connecting hole 32 that communicates with the through hole 124. A screw 13 is threaded in the through hole 124. The screw 13 passes through the eccentric shaft 12 to fix the roller assembly 11 on the slider 3.

[0046] The slider 3 has two sliding holes 31 on its side corresponding to the two guide rods 2, and each guide rod 2 slides in conjunction with the corresponding sliding hole 31.

[0047] The eccentric shaft 12 includes an upper end 121, a middle section 122 and a lower end 123. The bottom of the upper end 121 is connected to the top of the middle section 122, and the bottom of the middle section 122 is connected to the top of the lower end 123. A through hole 124 passes through the upper end 121, the middle section 122 and the lower end 123 in sequence. The upper end 121 is connected to the roller assembly 11, and the lower end 123 is embedded in the slot 33.

[0048] The diameters of the middle section 122, the upper end 121, and the lower end 123 show a decreasing trend.

[0049] The side of the tension sprocket assembly 9 is provided with a washer 16 located below the transverse frame 102. The two sides of the washer 16 are threadedly connected to the transverse frame 102 by mounting bolts 163.

[0050] The top of the transverse frame 102 is provided with mounting holes 104 corresponding to the two mounting bolts 163, and the bottom of the washer 16 is provided with a connection port 161 corresponding to the two mounting holes 104. One end of each mounting bolt 163 passes through the corresponding connection port 161 and mounting hole 104 to fix the washer 16 to the transverse frame 102.

[0051] The bottom of the washer 16 is located between the two mounting ports 104 and is connected and fixed to the tension sprocket assembly 9 by a fastening nut 162.

[0052] The transmission sprocket assembly 6 includes a sprocket 61, a sprocket shaft 62, and a sprocket drive component 64. The side of the sprocket 61 is connected to the support sprocket assembly 10 and the tension sprocket assembly 9 via a chain 5. The bottom of the sprocket 61 is connected to the top of the sprocket shaft 62. The sprocket drive component 64 is embedded in the three mounting slots 105. The sprocket shaft 62 is located in the sprocket drive component 64. The bottom of the sprocket drive component 64 is connected to the top of the pitch potentiometer 8.

[0053] The front of the sprocket drive component 64 is provided with multiple sets of symmetrically distributed bearings 63 on the left and right sides of the sprocket shaft 62.

[0054] The bottom of the sprocket drive component 64 is fitted with a retaining ring 19, and the top left and right ends of the retaining ring 19 are connected to the bottom of the transverse frame 102 by two fixing screws 191.

[0055] The bottom of the retaining ring 19 is fitted with a pressure cap 20, and the bottom of the pressure cap 20 is connected to the top of the pitch potentiometer 8.

[0056] The principle behind this design is explained as follows:

[0057] When the pitch control propeller device executes the pitch control command, the push-pull rod 18 first moves axially, driving the feedback ring 17 to move axially. The slider 3 follows the feedback ring 17 and moves axially on the guide rod 2. At the same time, the chain clip 4 on the slider 3 drives the chain 5 to move, thereby driving the sprocket 61, tension sprocket assembly 9 and support sprocket assembly 10 on the transmission sprocket assembly 6 to rotate. The sprocket shaft 62 on the transmission sprocket assembly 6 rotates, causing the pitch potentiometer 8 to change its potential and output a feedback signal to the control unit 23. The control unit 23 converts the pitch angle mechanical displacement into an electrical signal to perform pitch closed-loop control. At the same time, the pointer 14 moves axially with the slider 3 on the feedback ring 17, and provides real-time feedback on the pitch angle mechanical displacement through the pitch scale plate 15. The installation position is adjustable, which can be used in various ship hull environments and has high environmental adaptability. It has a simple structure, a high proportion of standard parts, and is economical and easy to maintain. Example

[0058] A pitch feedback mechanism includes a bracket 1, two guide rods 2, a slider 3, a transmission sprocket assembly 6, a tension sprocket assembly 9, a support sprocket assembly 10, and a roller assembly 11. The bracket 1 includes two vertical frames 101 and a horizontal frame 102, with the horizontal frame 102 positioned between the bottoms of the two vertical frames 101. Two guide rods 2 are arranged side-by-side between the two vertical frames 101, and the slider 3 slides with the two guide rods 2. The top of the slider 3 is connected to the bottom of a feedback ring 17. A push-pull rod 18 is provided on the side of the feedback ring 17, and a set of roller assemblies 1 is provided on each of the front and rear sides of the feedback ring 17. 1. The roller assembly 11 is connected to the slider 3. The bottom of the slider 3 is connected to the top of the chain clip 4. The chain clip 4 is engaged with the chain 5. The horizontal frame 102 is arranged from left to right below the guide rod 2, with a support sprocket assembly 10, a tension sprocket assembly 9, and a transmission sprocket assembly 6. The support sprocket assembly 10, the tension sprocket assembly 9, and the transmission sprocket assembly 6 are connected by the chain 5. The bottom of the transmission sprocket assembly 6 is connected to the top of the pitch potentiometer 8. The pitch potentiometer 8 is connected to the control unit 23. The back of the slider 3 is equipped with a pointer 14. The back of the horizontal frame 102 is equipped with a pitch scale plate 15 below the pointer 14.

[0059] In application: First, the push-pull rod 18 moves axially, driving the feedback ring 17 to move axially. The slider 3 follows the feedback ring 17 and moves axially on the guide rod 2. At the same time, the chain clip 4 on the slider 3 drives the chain 5 to move, thereby driving the transmission sprocket assembly 6, the tension sprocket assembly 9, and the support sprocket assembly 10 to rotate. The rotation of the transmission sprocket assembly 6 causes the pitch potentiometer 8 to change its potential and outputs a feedback signal to the control unit 23. The control unit 23 converts the mechanical displacement of the pitch angle into an electrical signal to perform closed-loop pitch control. A pitch scale plate 15 is installed above the bracket, and the pointer 14 is arranged above the pitch scale plate 15. The pointer 14 moves axially with the slider 3 on the feedback ring 17 and provides real-time feedback on the mechanical position of the pitch angle by indicating the pitch scale plate 15. Example

[0060] Example 2 is basically the same as Example 1, except that:

[0061] A pitch feedback mechanism is provided, wherein a U-shaped area 22 is formed between the two vertical frames 101 and the horizontal frame 102; the guide rod 2 is disposed between the two vertical frames 101; the top of the horizontal frame 102 is sequentially provided with a first mounting groove 106, a second mounting groove 103, and a third mounting groove 105; a support sprocket assembly 10 is installed in the first mounting groove 106, a tensioning sprocket assembly 9 is installed in the second mounting groove 103, and the support sprocket assembly 10 is installed in the third mounting groove 105; the horizontal frame 102... A mounting platform 21 is installed at the bottom, and the mounting platform 21 is connected to the hull by fixing bolts 7; the top of the slider 3 is provided with a slot 33, and an eccentric shaft 12 is embedded in the slot 33. Two sets of roller assemblies 11 are set on the side of the eccentric shaft 12. The top of the eccentric shaft 12 is provided with a through hole 124. The top of the slider 3 is provided with a connecting hole 32 that communicates with the through hole 124. A screw 13 is threaded in the through hole 124. The screw 13 passes through the eccentric shaft 12 to fix the roller assembly 11 on the slider 3.

[0062] In application: The roller assembly 11 is mounted on the eccentric shaft 12. The eccentricity of the eccentric shaft can be adjusted by the screw 13, thereby adjusting the distance between the two sets of roller assemblies 11 to accommodate the feedback ring 17 with different thickness and gap requirements. During operation, the feedback ring 17 rotates with the push-pull rod 18 and moves axially. After contacting the roller assembly 11, it drives the roller to rotate under the action of friction. The rollers on the roller assembly 11 are made of wear-resistant material and rotate on the eccentric shaft 12 through bearings. Example

[0063] Example 3 is basically the same as Example 1, except that:

[0064] A pitch feedback mechanism is provided, wherein the eccentric shaft 12 includes an upper end 121, a middle section 122, and a lower end 123. The bottom of the upper end 121 is connected to the top of the middle section 122, and the bottom of the middle section 122 is connected to the top of the lower end 123. A through hole 124 passes through the upper end 121, the middle section 122, and the lower end 123 in sequence. The upper end 121 is connected to a roller assembly 11, and the lower end 123 is embedded in a slot 33. The diameters of the middle section 122, the upper end 121, and the lower end 123 decrease in a decreasing trend. The side of the tension sprocket assembly 9 is located below the transverse frame 102. There is a washer 16, and both sides of the washer 16 are threadedly connected to the transverse frame 102 by mounting bolts 163; the top of the transverse frame 102 has a mounting port 104 corresponding to the two mounting bolts 163, and the bottom of the washer 16 has a connection port 161 corresponding to the two mounting ports 104. One end of each mounting bolt 163 passes through the corresponding connection port 161 and mounting port 104 to fix the washer 16 to the transverse frame 102; the bottom of the washer 16 is located between the two mounting ports 104 and is connected and fixed to the tension sprocket assembly 9 by a fastening nut 162.

[0065] In application: The drive sprocket assembly 6, the tension sprocket assembly 9, and the support sprocket assembly 10 form a sprocket group. The sprocket group is on the same plane to ensure smooth and reliable operation of the chain 5. The drive sprocket assembly 6 and the support sprocket assembly 10 are arranged at the left and right ends of the transverse frame 102 to support the chain 5. The tension sprocket assembly 9 is arranged in the middle. By adjusting the fastening nut 162 and the two mounting bolts 163, the tension sprocket assembly 9 can be moved up and down to adjust the tension of the chain 5. At the same time, the rotation of the sprocket 61 on the drive sprocket assembly 6 drives the pitch potentiometer 8 to rotate, generating a change in electrical signal, which is fed back to the control unit 23. Example

[0066] Example 4 is basically the same as Example 1, except that:

[0067] A pitch feedback mechanism is disclosed, wherein the transmission sprocket assembly 6 includes a sprocket 61, a sprocket shaft 62, and a sprocket drive component 64. The side of the sprocket 61 is connected to a support sprocket assembly 10 and a tension sprocket assembly 9 via a chain 5. The bottom of the sprocket 61 is connected to the top of the sprocket shaft 62. The sprocket drive component 64 is embedded in a three-mounting groove 105, and the sprocket shaft 62 is disposed within the sprocket drive component 64. The bottom of the sprocket drive component 64 is connected to the top of a pitch potentiometer 8. Multiple sets of symmetrically distributed bearings 63 are arranged on the front of the sprocket drive component 64 on the left and right sides of the sprocket shaft 62. A retaining ring 19 is installed at the bottom of the sprocket drive component 64. The top left and right ends of the retaining ring 19 are connected to the bottom of a transverse frame 102 via two fixing screws 191. A pressure cap 20 is embedded at the bottom of the retaining ring 19, and the bottom of the pressure cap 20 is connected to the top of the pitch potentiometer 8.

[0068] In application: The setting of the pressure cap 20 and the retaining ring 19 can ensure stronger stability of the connection between the transmission sprocket assembly 6 and the pitch potentiometer 8, reduce the impact of shaking or other external factors when used on the hull, the installation position is adjustable, it can be used in various hull environments, and has high environmental adaptability.

[0069] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A pitch feedback mechanism, characterized in that: The pitch feedback mechanism includes a bracket (1), two guide rods (2), a slider (3), a transmission sprocket assembly (6), a tension sprocket assembly (9), a support sprocket assembly (10), and a roller assembly (11). The bracket (1) includes two vertical frames (101) and a horizontal frame (102). The horizontal frame (102) is provided between the bottoms of the two vertical frames (101). Two guide rods (2) are arranged side by side between the two vertical frames (101). The slider (3) slides with the two guide rods (2). The top of the slider (3) is connected to the bottom of the feedback loop (17). A push-pull rod (18) is provided on the side of the feedback ring (17). The feedback ring (17) moves laterally with the push-pull rod (18). A set of roller assemblies (11) is provided on the front and rear sides of the feedback ring (17). The roller assembly (11) is connected to the slider (3). The bottom of the slider (3) is connected to the top of the chain card (4). The chain card (4) is engaged with the chain (5). The horizontal frame (102) is provided with a support sprocket assembly (10), a tension sprocket assembly (9) and a transmission sprocket assembly (6) arranged from left to right below the guide rod (2). The support sprocket assembly (10), the tension sprocket assembly (9) and the transmission sprocket assembly (6) are connected by a chain (5). The bottom of the transmission sprocket assembly (6) is connected to the top of the pitch potentiometer (8). The pitch potentiometer (8) is connected to the control unit (23) via a signal. A pointer (14) is mounted on the back of the slider (3), and a pitch scale plate (15) is mounted on the back of the transverse frame (102) below the pointer (14). The top of the slider (3) is provided with a slot (33), and an eccentric shaft (12) is embedded in the slot (33). Two sets of roller assemblies (11) are set on the side of the eccentric shaft (12). The top of the eccentric shaft (12) is provided with a through hole (124), and the top of the slider (3) is provided with a connecting hole (32) that communicates with the through hole (124). A screw (13) is threaded in the through hole (124), and the screw (13) passes through the eccentric shaft (12) to fix the roller assembly (11) on the slider (3). The transmission sprocket assembly (6) includes a sprocket (61), a sprocket shaft (62), and a sprocket drive component (64). The side of the sprocket (61) is connected to the support sprocket assembly (10) and the tension sprocket assembly (9) via a chain (5). The bottom of the sprocket (61) is connected to the top of the sprocket shaft (62). The sprocket drive component (64) is embedded in the three mounting slots (105). The sprocket shaft (62) is located in the sprocket drive component (64). The bottom of the sprocket drive component (64) is connected to the top of the pitch potentiometer (8). The front of the sprocket drive component (64) is provided with multiple sets of symmetrically distributed bearings (63) on the left and right sides of the sprocket shaft (62). The bottom of the sprocket drive component (64) is fitted with a retaining ring (19), and the top left and right ends of the retaining ring (19) are connected to the bottom of the transverse frame (102) by two fixing screws (191); The bottom of the retaining ring (19) is fitted with a pressure cap (20), and the bottom of the pressure cap (20) is connected to the top of the pitch potentiometer (8); The above pitch feedback mechanism is used as follows: When the pitch control device executes the pitch control command, the push-pull rod (18) moves axially first, which drives the feedback ring (17) to move axially. The slider (3) moves axially on the guide rod (2) along with the feedback ring (17). At the same time, the chain clip (4) on the slider (3) drives the chain (5) to move, thereby driving the sprocket (61), tension sprocket assembly (9) and support sprocket assembly (10) on the transmission sprocket assembly (6) to rotate. The sprocket shaft (62) on the transmission sprocket assembly (6) rotates, which drives the pitch potentiometer (8) to change its potential and outputs a feedback signal to the control unit (23). The control unit (23) converts the pitch angle mechanical displacement into an electrical signal and performs pitch closed-loop control. At the same time, the pointer (14) moves axially with the slider (3) on the feedback ring (17) and provides real-time feedback of the pitch angle mechanical displacement through the pitch scale plate (15).

2. The pitch feedback mechanism according to claim 1, characterized in that: A U-shaped area (22) is formed between the two vertical frames (101) and the horizontal frame (102); The guide rod (2) is set between two vertical frames (101). The top of the horizontal frame (102) is sequentially provided with a first mounting groove (106), a second mounting groove (103) and a third mounting groove (105). The support sprocket assembly (10) is installed in the first mounting groove (106), the tensioning sprocket assembly (9) is installed in the second mounting groove (103), and the support sprocket assembly (10) is installed in the third mounting groove (105).

3. The pitch feedback mechanism according to claim 2, characterized in that: The bottom of the transverse frame (102) is equipped with a mounting platform (21), which is connected to the hull by fixing bolts (7).

4. The pitch feedback mechanism according to claim 1, characterized in that: The slider (3) has two sliding holes (31) on its side corresponding to the two guide rods (2), and each guide rod (2) slides in conjunction with the corresponding sliding hole (31).

5. The pitch feedback mechanism according to claim 1, characterized in that: The eccentric shaft (12) includes an upper end (121), a middle section (122) and a lower end (123). The bottom of the upper end (121) is connected to the top of the middle section (122), and the bottom of the middle section (122) is connected to the top of the lower end (123). A through hole (124) passes through the upper end (121), the middle section (122) and the lower end (123) in sequence. The upper end (121) is connected to the roller assembly (11), and the lower end (123) is embedded in the slot (33). The diameters of the middle section (122), upper end (121), and lower end (123) decrease in a decreasing trend.

6. The pitch feedback mechanism according to claim 1, characterized in that: The side of the tension sprocket assembly (9) is provided with a washer (16) located below the transverse frame (102), and the two sides of the washer (16) are threadedly connected to the transverse frame (102) by mounting bolts (163).

7. A pitch feedback mechanism according to claim 6, characterized in that: The top of the transverse frame (102) is provided with mounting holes (104) corresponding to the two mounting bolts (163), and the bottom of the washer (16) is provided with a connection hole (161) corresponding to the two mounting holes (104). One end of each mounting bolt (163) passes through the corresponding connection hole (161) and mounting hole (104) to fix the washer (16) to the transverse frame (102); The bottom of the washer (16) is located between the two mounting ports (104) and is connected and fixed to the tension sprocket assembly (9) by a fastening nut (162).

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