Propeller blade tip grinding device

Abstract

The present invention discloses a propeller blade tip grinding device, including a frame, on which a measuring reference seat, a reciprocating swing mechanism, a conformal grinding slider and a digital display feeding mechanism are arranged in sequence from left to right. The frame is an upper and lower two-layer integral structure, including a top plate and a bottom plate. Positioning track grooves for installing the measuring reference seat and the conformal grinding slider are provided on the left and right sides of the top plate. An interface for installing the reciprocating swing mechanism is provided in the middle of the top plate. The digital display feeding mechanism is installed on the bottom plate, and the conformal grinding slider is fixedly connected to the digital display feeding mechanism. The propeller blade tip grinding device of the present invention replaces manual labor to achieve accurate control of the grinding path, saves manpower input, and improves grinding efficiency; combined with the conformal grinding method to process complex free-form surfaces, the synchronous grinding of the entire curved surface of the blade tip can be completed at one time, and continuous grinding of the blade tip can be achieved, ensuring linear consistency and eliminating the risks of cracking and incomplete edge edges.

Description

Technical Field

[0001] The invention belongs to the technical field of curved surface processing devices and relates to a propeller blade tip grinding device. Background Art

[0002] Ducted propellers, also known as "sleeve propellers", are made by adding an annular sleeve to the outer periphery of an open propeller. The profile of the sleeve is generally wing-shaped or angled. It has the advantages of improving the ship's maneuverability, protecting the propeller from collision with foreign objects, and increasing propulsion efficiency. It is widely used in ships with heavy propeller loads such as icebreakers, tugboats, and large oil tankers. The gap between the inner wall of the duct and the propeller blade tip in a ducted propeller is called the blade tip clearance. The size of the blade tip clearance directly affects the thrust, torque, and distribution of blade pressure along the chord line. When the manufacturing and assembly processes allow, improving the uniformity and control accuracy of the blade tip clearance can effectively reduce the turbulence loss at the blade tip and improve the hydrodynamic performance of the ducted propeller and the accuracy of its flow field control. Therefore, the blade tip clearance is an important parameter in the design of a ducted propeller. Effectively controlling the blade tip size accuracy and line consistency is the key to ensuring this parameter.

[0003] Ducted propellers include conventional metal propellers and composite propellers. Compared with metal propellers, composite propellers have the advantages of light weight, high efficiency, low vibration, low noise, and seawater corrosion resistance. Conventional metal ducted propellers generally use five-axis CNC milling machines to achieve precise machining of the blade tip surface line shape, but this method is difficult to apply to composite propellers. The main reason is that fiber-reinforced composite materials are difficult to cut. They are brittle and hard. As the cutting point of the blade tip surface changes continuously, the tool force point and force direction also change. It is difficult to ensure the uniformity of the tool force, which will cause quality problems such as blade tip burrs, delamination, and thin edge cracking.

[0004] At present, the processing quality of manual segmented grinding and repeated measurement and confirmation is seriously dependent on the skill level of the operator, which cannot effectively guarantee the linear accuracy and processing efficiency of the blade tip, and it is difficult to meet the needs of high-quality and efficient processing of composite ducted propeller blade tips. Summary of the invention

[0005] The purpose of the present invention is to provide a propeller blade tip grinding device, which solves the problems of large error and low grinding efficiency in existing manual grinding.

[0006] The technical solution adopted by the present invention is a propeller blade tip grinding device, including a frame, on which a measuring reference seat, a reciprocating swing mechanism, a conformal grinding slider and a digital display feeding mechanism are arranged from left to right in sequence. The frame is an integral structure with two layers, including a top plate and a bottom plate. Positioning track grooves for installing the measuring reference seat and the conformal grinding slider are opened on the left and right sides of the top plate, an interface for installing the reciprocating swing mechanism is opened in the middle of the top plate, the digital display feeding mechanism is installed on the bottom plate, and the conformal grinding slider is fixedly connected to the digital display feeding mechanism.

[0007] Among them, the reciprocating swing mechanism includes a positioning shaft, a locking pressure plate, a rotating swing cylinder and a support seat. The positioning shaft is vertically installed in the interface in the middle of the top plate. The locking pressure plate is arranged on the top of the positioning shaft. The support seat is sleeved on the positioning shaft and fixedly connected to the bottom surface of the frame top plate. The driving shaft of the rotating swing cylinder is connected to the bottom end of the positioning shaft.

[0008] The opposite surface of the measuring reference seat and the conformal grinding slide block is the working surface, and the working surface is an equidistant reference curved surface of the blade tip end surface line.

[0009] The working surface of the conformal grinding slider is a grinding surface, and sandpaper is adhered to the grinding surface.

[0010] The digital display feeding mechanism includes a hand-cranked slide, a grating scale displacement sensor and a grating scale display. The hand-cranked slide is fixedly connected to the bottom plate of the frame, the conformal grinding slider is fixed on the hand-cranked slide, the grating scale displacement sensor is installed on one side of the hand-cranked slide, parallel to the feeding direction of the hand-cranked slide, and the grating scale display is installed on the frame.

[0011] The measuring reference seat is fixed on the frame.

[0012] The beneficial effects of the present invention are that a propeller blade tip grinding device is composed of a frame, a measuring reference seat, a reciprocating swing mechanism, a conformal grinding slider and a digital display feeding mechanism, and the propeller blade to be ground is fixed on the reciprocating swing mechanism, so that the propeller blade to be ground performs a reciprocating high-frequency swing at a certain angle along the circumferential direction, thereby replacing manual labor to achieve accurate control of the grinding path, saving manpower investment and improving grinding efficiency; combining the conformal grinding method to process complex free-form surfaces, the synchronous grinding of the entire curved surface of the blade tip can be completed at one time, and continuous grinding of the blade tip can be achieved, ensuring linear consistency and eliminating the risks of cracking and incomplete edge edges; by gradually increasing the grinding amount, the controllability of the precision is improved, and the requirements for personnel skills are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a propeller blade tip grinding device of the present invention;

[0014] Figure 2 The diagram is an explosion diagram of a propeller blade tip grinding device according to the present invention.

[0015] In the figure, 1. frame, 2. reciprocating swing mechanism, 3. measuring reference seat, 4. conformal grinding slider, 5. digital display feeding mechanism, 6. positioning shaft, 7. locking pressure plate, 8. propeller, 9. rotary swing cylinder, 10. support seat, 11. sandpaper, 12. hand slide, 13. grating scale displacement sensor, 14. grating scale display. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The present invention is a propeller blade tip grinding device, referring to Figure 1 and Figure 2 , including a frame 1, on which a measuring reference seat 3, a reciprocating swing mechanism 2, a conformal grinding slider 4 and a digital display feeding mechanism 5 are arranged from left to right. The frame 1 is an integral structure with two layers, including a top plate and a bottom plate. Positioning track grooves for installing the measuring reference seat 3 and the conformal grinding slider 4 are opened on the left and right sides of the top plate, and an interface for installing the reciprocating swing mechanism 2 is opened in the middle of the top plate. The digital display feeding mechanism 5 is installed on the bottom plate, and the conformal grinding slider 4 is fixedly connected to the digital display feeding mechanism 5.

[0018] The reciprocating swing mechanism 2 includes a positioning shaft 6, a locking plate 7, a rotating swing cylinder 9 and a support seat 10. The positioning shaft 6 is vertically installed in the interface in the middle of the top plate. The locking plate 7 is arranged on the top of the positioning shaft 6. The support seat 10 is sleeved on the positioning shaft 6 and fixedly connected to the bottom surface of the top plate of the frame 1. The driving shaft of the rotating swing cylinder 9 is connected to the bottom end of the positioning shaft 6. When grinding the propeller blade tip, first remove the locking plate 7, sleeve the propeller 8 to be ground on the positioning shaft 6, and then fix the propeller 8 on the positioning shaft 6 with the locking plate 7, start the rotating swing cylinder 9, and the rotating swing cylinder 9 drives the positioning shaft 6 to perform a reciprocating high-frequency swing at a certain angle along the circumferential direction. The positioning shaft 6 drives the propeller 8 to perform a reciprocating high-frequency swing. The swing amplitude can be freely set by the angle limit of the rotating swing cylinder 9, thereby realizing the planning of the grinding path.

[0019] The measuring reference seat 3 is an auxiliary mechanism for detecting the blade tip size and linear shape. It is installed and fixed in the positioning track groove on the left side of the top plate of the frame 1, and is referenced with the radial and axial directions of the positioning shaft 6. It needs to be configured accordingly according to the blade tip size and linear shape of different products. The opposite surface of the measuring reference seat 3 and the conformal grinding slider 4 is the working surface, and the working surface is an equidistant reference surface of the blade tip end face linear shape, and forms a uniform gap with the blade tip end face after grinding. The uniformity of the measuring gap can be used to accurately detect and evaluate the consistency of the blade tip size and linear shape.

[0020] The working surface of the conformal grinding slider 4 is a grinding surface, and sandpaper 11 is adhered to the grinding surface. The conformal grinding slider 4 is placed in the positioning track groove on the right side of the top plate of the frame 1, and is driven by the digital display feeding mechanism 5 connected to the back, and radial feed is performed along the direction of the positioning track groove. After contacting the swinging propeller 8 blade tip, the overall conformal grinding of the current blade tip can be achieved.

[0021] The digital display feed mechanism 5 includes a hand-cranked slide 12, a grating scale displacement sensor 13 and a grating scale display 14. The hand-cranked slide 12 is fixedly connected to the bottom plate of the frame 1, and the conformal grinding slider 4 is fixed on the hand-cranked slide 12. The grating scale displacement sensor 13 is installed on one side of the hand-cranked slide 12, parallel to the feeding direction of the hand-cranked slide 12, and the grating scale display 14 is installed on the frame 1, which displays the displacement of the hand-cranked slide 12 and the conformal grinding slider 4 in real time, so as to realize the monitoring of the grinding feed amount.

[0022] The frame 1 is welded and assembled with steel, and features such as positioning track grooves and mechanism installation positioning interfaces are formed through overall processing; the positioning shaft 6 is made of 9Cr18 bearing steel, installed in the shaft hole, and axial constraints are achieved through shaft shoulders and plane bearings; the measuring reference seat 3 and the conformal grinding slider 4 are made of 304 stainless steel, and are processed according to the blade tip size and linear shape of different products and the positioning track interface size on the frame 1; the hand-cranked slide 12 uses a heavy-duty structure with a repeatability of 0.01mm and a stroke of 200mm; The grating scale displacement sensor 13 uses the model DC10-50m / 5μm, the range is 200mm, and the accuracy is ±5μm; the specifications of the grating scale display 14 are the power supply range AC80V~260V / 50HZ~60HZ, single-axis coordinates, and the resolution is 0.5μm; the rotary swing cylinder 9 uses a cylinder diameter of 40mm, an adjustable rotation angle range of 0°~230°, and an allowable working pressure of 0.2MPa~1.0MPa; the sandpaper 11 uses a paper-based adhesive-backed type, and the mesh size is selected according to the surface finish requirements.

[0023] The grinding method of the composite material ducted propeller blade tip grinding device based on the present invention is characterized in that the product takes the central axis as the rotation center and performs reciprocating high-frequency swing at a certain angle along the circumferential direction, thereby replacing manual labor to achieve accurate control of the grinding path, saving manpower investment and improving grinding efficiency; combining the method of conformal grinding to process complex free-form surfaces, the synchronous grinding of the entire curved surface of the blade tip can be completed at one time, and continuous grinding of the blade tip can be achieved, ensuring linear consistency and eliminating the risks of cracking and incomplete edge edges; by gradually increasing the grinding amount, the controllability of the precision is improved and the skill requirements for personnel are reduced.

[0024] When the propeller blade tip grinding device of the present invention is used, the specific operation steps are as follows:

[0025] Step 1: Install the dedicated measurement reference seat 3 corresponding to the propeller product 8 on the positioning track groove on the left side of the upper plate of the frame 1 and tighten it;

[0026] Step 2, stick sandpaper 11 on the grinding surface of the conformal grinding slider 4, place it on the positioning track groove on the right side of the upper plate of the frame 1, and connect and tighten it with the hand-cranked slide 12;

[0027] Step 3, operate the hand-cranked slide 12 to move the conformal grinding slide 4 to the right, make room for the propeller product 8 to be installed, and adjust the swing speed and swing angle of the rotary swing cylinder 9;

[0028] Step 4: Install the propeller product 8 on the positioning shaft 6 of the frame 1, so that the blade to be ground faces the conformal grinding slider 4, and fix it with a locking pressure plate 7;

[0029] Step 5: Start the rotary swing cylinder 9 to drive the propeller product 8 to perform circumferential reciprocating motion;

[0030] Step 6, start the grating ruler display 14, operate the hand-cranked slide 12, drive the conformal grinding slide 4 to contact the blade to be ground, and after confirming that the blade end surface is ground and smooth, set the coordinate data of the grating ruler display 14 to zero, and complete the tool setting;

[0031] Step 7, move the conformal grinding slider 4 to the right until it is separated from the blade end surface, stop rotating the swing cylinder 9, release the locking plate 7, rotate the ground blade to align with the measuring reference seat 3, measure the gap value with a measuring rod, and calculate the remaining grinding amount;

[0032] Step 8, rotate the blade to be ground to a state aligned with the conformal grinding slider 4, lock the product, start the rotary swing cylinder 9, operate the hand-cranked slide 12, drive the conformal grinding slider 4 to grind the blade end surface, and when the coordinate data of the grating ruler display 14 is consistent with the calculated remaining grinding amount, the grinding process is completed;

[0033] Step 9: Repeat step 7 to confirm that the gap size after grinding meets the process requirements;

[0034] Step 10. Repeat steps 4 to 9 to complete the grinding of the remaining blade tips.

[0035] Example 1

[0036] The three-blade composite duct propeller, with a diameter of 0.6m, requires a blade tip clearance of 1.5mm±0.2mm and a smooth blade tip end surface. According to the line shape of the inner surface of the duct, the measuring reference seat 3 and the conformal grinding slider 4 are respectively made; the swing speed of the rotary swing cylinder 9 is set to 120 times / min and the swing angle is ±20°; 100-grit sandpaper 11 is selected; the feed speed of the hand-cranked slide 12 is about 0.2mm / min; and the operation is carried out according to the above implementation steps.

[0037] In this embodiment, 20 blade tips of 3-blade composite material duct propellers were ground, and the number of blades ground was 60. By using the method of the present invention, the average working time was shortened from 61.8 min / piece to 10.2 min / piece, and the efficiency was increased by more than 6 times; the dimensional accuracy was improved from the original ±0.2 mm to ±0.1 mm, and the detailed data is shown in the table below. In this embodiment, the blade tips had no burrs, delamination, or thin edge cracking.

[0038] The processing efficiency and processing accuracy of the method of the present invention and the original grinding method

[0039]

[0040]

[0041] Example 2

[0042] The 7-blade composite duct propeller, with a diameter of 0.4m, requires a blade tip clearance of 1.2mm±0.2mm and a smooth blade tip end surface. According to the line shape of the inner surface of the duct, the measuring reference seat 3 and the conformal grinding slider 4 are respectively made; the swing speed of the rotary swing cylinder 9 is set to 100 times / min and the swing angle is ±15°; 150-grit sandpaper 11 is selected; the feed speed of the hand-cranked slide 12 is about 0.3mm / min; and the operation is carried out according to the above implementation steps.

[0043] In this embodiment, blade tips of 10 7-blade composite duct propellers were ground, with 70 blades ground. The average working time was shortened from 62.3 min / blade to 11.4 min / blade by the method of the present invention, and the efficiency was increased by more than 5 times. The dimensional accuracy was increased from the original ±0.2 mm to ±0.1 mm. Detailed data is shown in the table below. In this embodiment, the blade tips had no burrs, delamination, or thin edge cracking.

[0044] The processing efficiency and processing accuracy of the method of the present invention and the original grinding method

[0045]

Claims

1. Propeller blade tip grinding device, It is characterized in that The machine comprises a frame (1), on which a measuring reference seat (3), a reciprocating swing mechanism (2), a conformal grinding slider (4) and a digital display feeding mechanism (5) are arranged in sequence from left to right. The frame (1) is an upper and lower two-layer integral structure, comprising a top plate and a bottom plate. Positioning track grooves for installing the measuring reference seat (3) and the conformal grinding slider (4) are provided on the left and right sides of the top plate. An interface for installing the reciprocating swing mechanism (2) is provided in the middle of the top plate. The digital display feeding mechanism (5) is installed on the bottom plate. The conformal grinding slider (4) is fixedly connected to the digital display feeding mechanism (5). The reciprocating swing mechanism (2) comprises a positioning shaft (6), a locking pressure plate (7), a rotary swing cylinder (9) and a support seat (10); the positioning shaft (6) is vertically mounted in an interface in the middle of a top plate; the locking pressure plate (7) is arranged on the top of the positioning shaft (6); the support seat (10) is sleeved on the positioning shaft (6) and is fixedly connected to the bottom surface of the top plate of the frame (1); the driving shaft of the rotary swing cylinder (9) is connected to the bottom end of the positioning shaft (6); the surface opposite to the conformal grinding slider (4) of the measuring reference seat (3) is a working surface; the working surface is an equidistant reference curved surface of the blade tip end surface line; the conformal grinding The working surface of the grinding slider (4) is a grinding surface, and sandpaper (11) is adhered to the grinding surface. The digital display feeding mechanism (5) includes a hand-cranked slide (12), a grating ruler displacement sensor (13) and a grating ruler display (14). The hand-cranked slide (12) is fixedly connected to the bottom plate of the frame (1), the conformal grinding slider (4) is fixed on the hand-cranked slide (12), the grating ruler displacement sensor (13) is installed on one side of the hand-cranked slide (12) and is parallel to the feeding direction of the hand-cranked slide (12), the grating ruler display (14) is installed on the frame (1), and the measuring reference seat (3) is fixed on the frame (1).

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