A method of assembling a hub

Abstract

A kind of assembly method of paddle hub, the method includes the following steps: first step: repair sliding block inner hole, the gap value of the outer circle of crank pin on crank disc and inner hole meets the inspection standard;Second step: repair sliding block and the sliding block groove on piston rod, so that it meets the requirement;Repair groove sliding block or sliding block groove until the gap value meets the inspection standard;Third step: the paddle shell is connected with hollow support, then install crank disc, fix the crank pin on the upper end of crank disc, then sliding block is sleeved on the outer circle;Fourth step: piston rod drops into the paddle shell, after sliding block enters sliding block groove, make the vertical movement stroke of sliding block and crank pin be synchronous with piston rod drop, piston rod stops descending after descending to appropriate position, then fix crank disc;Fifth step: other parts in the assembly of paddle hub.The design sets the test index between crank pin, sliding block and piston rod to improve the operation accuracy of mechanism.Therefore, the assembly quality of the paddle hub of the design is high.

Description

Technical Field

[0001] This invention relates to an assembly method for a device, belonging to the field of mechanical installation, and particularly to an assembly method for a propeller hub. Background Technology

[0002] The propeller hub is one of the important components in the controllable pitch propeller system. Its main function is to transmit the torque of the shafting components to generate the propulsion power for the ship.

[0003] Chinese patent application number 201720185613.6, filed on February 28, 2017, discloses a hub structure for an adjustable propeller thruster, including two oil pipes and a guide frame installed around the two oil pipes; a piston and a limiting nut are installed at one end of the guide frame, wherein the limiting nut is located at the end of the guide frame, and a flange is provided at the other end of the guide frame, the outer surface of which has a U-shaped groove circumferentially provided; a slider is installed in the groove; a propeller shell is installed around the piston, the propeller shell being hollow cylindrical; a rib is provided in the middle part of the inner surface of the propeller shell extending radially inward to the guide frame, the rib being located between the piston and the flange; a crank disk is installed at one end of the outer surface of the propeller shell, the crank disk being connected to the slider; and an end cap is installed at one end of the propeller shell.

[0004] Although this design reduces the number of parts and improves processing efficiency by eliminating the bolts connecting the cylinder and the propeller housing, it still has the following drawbacks:

[0005] This design does not check the clearance between the slider and the crank plate, nor the clearance between the slider and the U-shaped groove. In application, the slider is fitted onto the outside of the crank plate, and both the crank plate and the slider extend into the U-shaped groove of the guide frame. During pitch adjustment, there is relative rotational motion between the crank plate and the slider, and relative linear motion between the slider and the guide frame. If the clearance between the slider and the crank plate, or between the slider and the U-shaped groove, is too small, it will cause excessive pitch adjustment resistance in the propeller hub. If the clearance between the slider and the crank plate, or between the slider and the U-shaped groove, is too large, it will lead to a decrease in the rotational accuracy of the propeller hub mechanism. When excessive pitch adjustment resistance or decreased rotational accuracy occurs, the propeller hub needs to be disassembled and reassembled. Therefore, in the existing technology, the propeller hub assembly quality is not high.

[0006] The information disclosed in this background section is intended only to enhance understanding of the overall background of this 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

[0007] The purpose of this invention is to overcome the defects and problems of low assembly quality of propeller hubs in the prior art, and to provide an assembly method for propeller hubs with high assembly quality.

[0008] To achieve the above objectives, the technical solution of the present invention is:

[0009] A method for assembling a propeller hub, the method comprising the following steps:

[0010] Step 1: First, measure the outer diameter of the crank pin on the crankshaft. Then, modify the inner wall of the slider's inner hole to match the outer diameter. Next, perform the measurement steps: First, fit the inner hole onto the outer circle, then measure the gap between the outer circle and the inner hole. If the gap does not meet the inspection standard, separate the inner hole and the outer circle, then modify the inner wall of the inner hole. Repeat the aforementioned measurement steps until the gap meets the inspection standard. Then, separate the outer circle and the inner hole to complete Step 1.

[0011] Step 2: First, repair the top and bottom surfaces of the slider groove on the piston rod to meet the requirements; then repair the top and bottom surfaces of the slider to meet the requirements; then place the slider into the slider groove, aligning the top surface of the slider with the top surface of the groove and the bottom surface of the slider with the bottom surface of the groove. Then perform the measurement steps: first, measure the gap between the top surface of the slider and the top surface of the groove; then measure the gap between the bottom surface of the slider and the bottom surface of the groove. If the gap does not meet the inspection standard, separate the slider groove and the slider, and repair one or more of the top surface of the slider, the top surface of the groove, the bottom surface of the slider, or the bottom surface of the groove. Repeat the aforementioned measurement steps until the gap meets the inspection standard. Then separate the slider groove and the slider to end Step 2.

[0012] Step 3: First connect the propeller housing to the hollow bracket, then install the crank plate on the propeller housing, then fix the crank pin to the upper end of the crank plate, then fix the clamping plate to the crank plate, and then put the slider on the outside of the outer circle to end Step 3.

[0013] Step 4: First, lower the piston rod into the propeller housing. After the slider and crank pin enter the slider groove, remove the pressure plate. Then, lower the piston rod. The vertical movement of the slider and crank pin should be synchronized with the piston rod's descent. Stop lowering the piston rod when it reaches the appropriate position. Then, fix the pressure plate and crank disc to complete step 4.

[0014] In the first step, the inspection standard for the gap between the outer circle and the inner hole is 0.01 to 0.1 mm.

[0015] In the second step, after the top and bottom surfaces of the tank are repaired, a standard plate is used to inspect the top and bottom surfaces of the tank.

[0016] In the second step, the requirements for the top surface of the tank are: the contact area between the top surface of the tank and the standard plate is greater than or equal to 75%, and the contact points between the top surface of the tank and the standard plate within an area of ​​25mm×25mm are no less than 5.

[0017] In the second step, the requirements for the bottom surface of the tank are: the contact area between the bottom surface of the tank and the standard plate is greater than or equal to 75%, and the contact spots between the bottom surface of the tank and the standard plate within an area of ​​25mm×25mm are not less than 5.

[0018] In the second step, the requirements for the top surface of the slider are: the contact area between the top surface of the slider and the top surface of the groove is greater than or equal to 75%, and the contact between the top surface of the slider and the top surface of the groove is uniform.

[0019] In the second step, the requirements for the bottom surface of the slider are: the contact area between the bottom surface of the slider and the bottom surface of the groove is greater than or equal to 75%, and the contact between the bottom surface of the slider and the bottom surface of the groove is uniform.

[0020] In the second step, the gap between the top surface of the slider and the top surface of the groove is 0.02 to 0.15 mm;

[0021] In the second step, the gap between the bottom surface of the slider and the bottom surface of the groove is 0.02 to 0.15 mm.

[0022] In the third step, the small end of the propeller shell is connected to the top surface of the hollow support.

[0023] In the third step, the crank disc is installed at the opening of the propeller housing, with the end of the crank disc away from the crank pin facing the outside of the propeller housing;

[0024] The crank pin is fixed to the upper part of the crank disc near the large end of the propeller housing, and the center line of the crank pin is on the same plane as the center of the propeller housing.

[0025] In the third step, the clamping plate is provided with a fixing hole, which is a through hole; the crank plate is provided with a screw hole, which is a countersunk hole opening towards the fixing hole; the same clamping screw passes through the fixing hole and is screwed into the screw hole.

[0026] In the fourth step, the upper end of the piston rod is provided with two threaded holes. The threaded holes are countersunk holes that open in one direction towards the top of the piston rod, and eye bolts are screwed into the threaded holes.

[0027] In the fourth step, the centerline of the piston rod is perpendicular to the plane of the hollow support, and the centerline of the slider groove is on the same plane as the center of the propeller housing; the piston rod stops descending when the center of the crank pin and the center of the crank disc are on the same horizontal plane.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. A method for assembling a propeller hub according to the present invention includes the following steps: Step 1: Adjusting the outer diameter of the crank pin on the crank disc to match the inner hole of the slider so that the clearance difference meets the inspection index, and then separating the crank pin from the outer diameter; Step 2: First adjusting the top and bottom surfaces of the slider groove to meet the requirements, then adjusting the top and bottom surfaces of the slider to meet the requirements, then measuring the clearance between the slider and the slider groove, adjusting the clearance to meet the inspection index, and then separating the slider from the slider groove; Step 3: First installing the crank disc on the propeller housing, then rotating the crank pin to the upper part of the crank disc, fixing the crank disc, and then fitting the slider onto the outer diameter; Step 4: First lowering the piston rod into the propeller housing, and waiting for the slider and crank pin to enter... After entering the slider groove, the crank plate is released from its fixed position, allowing the crank pin and crank plate to rotate. The piston rod then continues to descend, with the slider and crank pin descending vertically in sync with the piston rod. The piston rod stops descending after reaching a suitable position, and then the crank plate is fixed. In application, this invention scientifically and rationally sets inspection indicators for the clearance between the inner hole and the outer circle, and for the clearance between the slider and the slider groove. A fitting method is used to ensure that the clearance values ​​between each component meet the inspection indicators. Therefore, after assembling the components, the crank pin, slider, and piston rod have a good fit, preventing excessive pitch control resistance or insufficient mechanism precision in the propeller hub. This improves the service life and reliability of the pitch control propeller using the hub. Therefore, the propeller hub assembly quality of this invention is high.

[0030] 2. In the assembly method of the propeller hub of the present invention, in the first step, the clearance distance between the outer circle and the inner hole is 0.01 to 0.1 mm. In application, if the clearance distance between the outer circle and the inner hole is within the range of 0.01-0.1 mm, the outer circle can rotate freely in the inner hole; if the clearance distance between the outer circle and the inner hole is less than 0.01 mm, the friction when the outer circle rotates in the inner hole is large, which easily causes wear on the outer circle and the inner hole; if the clearance distance between the outer circle and the inner hole is greater than 0.1 mm, the rotational accuracy of the mechanism decreases. Therefore, the fit between the outer circle and the inner hole is good in the present invention.

[0031] 3. In the assembly method of the propeller hub of the present invention, in the second step, after repairing the slider groove, a standard plate is used to inspect the top and bottom surfaces of the slider groove; the inspection standard is: the contact area between the top and bottom surfaces of the groove and the standard plate is greater than or equal to 75%, and the top and bottom surfaces of the groove have no less than 5 contact spots within an area of ​​25mm×25mm; the inspection standard for the slider groove and the slider is: the slider and the slider groove have uniform contact and the contact area is greater than or equal to 75%; the gap distance between the slider and the slider groove is 0.02 to 0.15mm. In application, first apply blue oil to the flat surface of the standard plate, then rub the side of the standard plate with blue oil against the top surface of the groove. After rubbing the entire top surface of the groove with the standard plate, remove the standard plate. Check if the contact area between the slider groove and the standard plate is greater than or equal to 75%. Then check the contact spots on the top surface of the groove with blue oil, and determine if the number of contact spots is greater than 5. If it is greater than 5, the top surface of the groove is qualified. Check the bottom surface of the groove using the same steps as above. Then, adjust the top surface and bottom surface of the slider to ensure that the top surface of the slider and the top surface of the groove are in uniform contact with each other and the contact area is greater than or equal to 75%, and that the bottom surface of the slider and the bottom surface of the groove are in uniform contact with each other and the contact area is greater than or equal to 75%. Then measure the gap distance between the slider and the slider groove, ensuring that the gap distance is within the range of 0.02 to 0.15 mm. If the aforementioned standard is met, the slider can move freely in the slider groove when the pitch adjustment paddle is adjusted, and the operating accuracy of the mechanism can also meet the requirements. Therefore, the slider and slider groove have a high degree of fit in this invention.

[0032] 4. In the assembly method of the propeller hub of the present invention, in the third step, the small end of the propeller housing is connected to the top surface of the hollow support; the crank disc is installed at the opening of the propeller housing, and the crank pin is fixed to the upper part of the crank disc near the large end of the propeller housing; the clamping plate is provided with a fixing hole, and the crank disc is provided with a screw hole; the same clamping screw passes through the fixing hole and is screwed into the screw hole. In application, the small end of the propeller housing is connected to the hollow support, which facilitates the piston rod to enter the propeller housing from above; the crank pin is fixed to the upper part of the crank disc, which facilitates the crank pin to enter the slider groove from the opening of the slider groove; the clamping plate and the crank disc are fixed by screws, forming a clamping effect between the clamping plate and the crank disc to fix the propeller housing. Therefore, the propeller housing and the crank disc are easy to fix in the present invention.

[0033] 5. In the assembly method of the propeller hub of the present invention, in the fourth step, the upper end of the piston rod is provided with two threaded holes, and the eye bolt is screwed into the threaded holes; the center line of the piston rod is perpendicular to the plane where the hollow support is located, and the center line of the slider groove is on the same plane as the center of the propeller housing; when the piston rod descends to the point where the center of the crank pin and the center of the crank disc are on the same horizontal plane, the piston rod stops descending. In application, first screw the eye bolt into the threaded hole, then connect the equipment to the eye bolt, and then suspend the piston rod above the propeller housing so that the center line of the piston rod is perpendicular to the plane where the piston rod is located. With the plane perpendicular to the hollow support, the center line of the slider groove and the center of the propeller housing are aligned on the same plane. The piston rod is then slowly lowered into the propeller housing. After the slider and crank pin enter the slider groove, the bottom of the piston rod is supported by a jack. The jack is then adjusted to slowly lower the piston rod until the center of the crank pin and the center of the crank disc are on the same plane. The piston rod stops descending at this point. During installation, by ensuring that the center line of the slider groove and the center line of the propeller housing are on the same plane, and that the center of the crank pin coincides with the center of the crank disc, the piston rod is ensured to be centered in the propeller housing. Therefore, the piston rod installation accuracy is high in this invention. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure after the steps of the present invention are completed.

[0035] Figure 2 yes Figure 1 Enlarged schematic diagram of the intermediate pressure plate, crank plate and slider groove.

[0036] Figure 3 yes Figure 1 Schematic diagram of the middle propeller shell structure.

[0037] Figure 4 This is a structural schematic diagram of Example 4.

[0038] Figure 5 This is a structural schematic diagram of Example 5.

[0039] In the diagram: 1. Crankshaft plate; 11. Crank pin; 12. Outer circle; 13. Screw hole; 2. Slider; 21. Inner hole; 22. Top surface of slider; 23. Bottom surface of slider; 3. Piston rod; 31. Slider groove; 311. Top surface of groove; 312. Bottom surface of groove; 32. Threaded hole; 33. Eye bolt; 4. Propeller housing; 41. Small end; 42. Large end; 43. Opening; 5. Hollow bracket; 6. Pressure plate; 61. Fixing hole; 7. Pressure bolt; 8. Propeller hub. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Please see Figure 1 — Figure 5 A method for assembling a propeller hub, the method comprising the following steps:

[0042] Step 1: First, measure the diameter of the outer circle 12 of the crank pin 11 on the crank plate 1. Then, modify the inner wall of the inner hole 21 of the slider 2 to match the outer circle 12. Then, perform the measurement steps: First, fit the inner hole 21 onto the outer circle 12. Then, measure the gap between the outer circle 12 and the inner hole 21. If the gap does not meet the inspection standard, separate the inner hole 21 and the outer circle 12. Then, modify the inner wall of the inner hole 21. Repeat the above measurement steps until the gap meets the inspection standard. Then, separate the outer circle 12 and the inner hole 21 to end Step 1.

[0043] Step 2: First, repair the top surface 311 and bottom surface 312 of the slider groove 31 on the piston rod 3 to meet the requirements; then repair the top surface 22 and bottom surface 23 of the slider 2 to meet the requirements; then place the slider 2 into the slider groove 31, aligning the top surface 22 of the slider with the top surface 311 of the groove and the bottom surface 23 of the slider with the bottom surface 312 of the groove. Then perform the measurement steps: first measure the gap between the top surface 22 of the slider and the top surface 311 of the groove, then measure the gap between the bottom surface 23 of the slider and the bottom surface 312 of the groove. If the gap does not meet the inspection standard, separate the slider groove 31 and the slider 2, and repair one or more of the top surface 22 of the slider, the top surface 311 of the groove, the bottom surface 23 of the slider, or the bottom surface 312 of the groove. Repeat the above measurement steps until the gap meets the inspection standard. Then separate the slider groove 31 and the slider 2 to end Step 2.

[0044] Step 3: First connect the propeller housing 4 to the hollow bracket 5, then install the crank plate 1 on the propeller housing 4, then fix the crank pin 11 to the upper end of the crank plate 1, then fix the clamping plate 6 to the crank plate 1, and then put the slider 2 on the outside of the outer circle 12 to end the third step.

[0045] Step 4: First, lower the piston rod 3 into the propeller housing 4. After the slider 2 and crank pin 11 enter the slider groove 31, remove the clamping plate 6. Then, lower the piston rod 3. The vertical movement stroke of the slider 2 and crank pin 11 is synchronized with the piston rod 3. After the piston rod 3 reaches the appropriate position, stop lowering. Then, fix the clamping plate 6 and crank disc 1 to end step 4.

[0046] In the first step, the inspection standard for the gap between the outer circle 12 and the inner hole 21 is 0.01 to 0.1 mm.

[0047] In the second step, after repairing the top surface 311 and the bottom surface 312 of the tank, the top surface 311 and the bottom surface 312 of the tank are inspected using a standard plate.

[0048] In the second step, the requirements for the top surface 311 of the groove are: the contact area between the top surface 311 of the groove and the standard plate is greater than or equal to 75%, and the contact points between the top surface 311 of the groove and the standard plate within an area of ​​25mm×25mm are not less than 5.

[0049] In the second step, the requirements for the bottom surface 312 of the tank are: the contact area between the bottom surface 312 of the tank and the standard plate is greater than or equal to 75%, and the contact spots between the bottom surface 312 of the tank and the standard plate within an area of ​​25mm×25mm are not less than 5.

[0050] In the second step, the requirements for the top surface 22 of the slider are: the contact area between the top surface 22 of the slider and the top surface 311 of the groove is greater than or equal to 75%, and the contact between the top surface 22 of the slider and the top surface 311 of the groove is uniform.

[0051] In the second step, the requirements for the bottom surface 23 of the slider are: the contact area between the bottom surface 23 of the slider and the bottom surface 312 of the groove is greater than or equal to 75%, and the contact between the bottom surface 23 of the slider and the bottom surface 312 of the groove is uniform.

[0052] In the second step, the gap between the top surface 22 of the slider and the top surface 311 of the groove is 0.02 to 0.15 mm;

[0053] In the second step, the gap between the bottom surface 23 of the slider and the bottom surface 312 of the groove is 0.02 to 0.15 mm.

[0054] In the third step, the small end 41 of the propeller housing 4 is connected to the top surface of the hollow support 5.

[0055] In the third step, the crank disc 1 is installed at the opening 43 of the propeller housing 4, with the end of the crank disc 1 away from the crank pin 11 facing the outside of the propeller housing 4.

[0056] The crank pin 11 is fixed on the upper part of the crank disc 1 near the large end 42 of the propeller housing 4, and the center line of the crank pin 11 is on the same plane as the center of the propeller housing 4.

[0057] In the third step, the clamping plate 6 is provided with a fixing hole 61, which is a through hole; the crank plate 1 is provided with a screw hole 13, which is a countersunk hole opening towards the fixing hole 61; the same clamping screw 7 passes through the fixing hole 61 and is screwed into the screw hole 13.

[0058] In the fourth step, the upper end of the piston rod 3 is provided with two threaded holes 32. The threaded holes 32 are countersunk holes that open in one direction towards the top of the piston rod 3. A lifting eye screw 33 is screwed into the threaded holes 32.

[0059] In the fourth step, the center line of the piston rod 3 is perpendicular to the plane of the hollow support 5, and the center line of the slider groove 31 is on the same plane as the center of the paddle housing 4; when the piston rod 3 descends to the point where the center of the crank pin 11 and the center of the crank disc 1 are on the same horizontal plane, the piston rod 3 stops descending.

[0060] The following are supplementary descriptions of the present invention:

[0061] The propeller hub 8 is a crucial component of the controllable pitch propeller assembly, housing the pitch adjustment mechanism within its internal cavity. During pitch adjustment, multiple friction pairs exhibit relative motion; for example, slider 2 and piston rod 3 experience relative linear motion, while slider 2 and crank disc 1 exhibit relative rotational motion. Therefore, appropriate clearances must be established between crank disc 1, slider 2, and piston rod 3 to ensure the mechanism's operational accuracy. The overall assembly of the propeller hub 8 is complex and challenging. For instance, crank disc 1, slider 2, slider 2, piston rod 3, and other components are interconnected and interdependent. Failure to properly arrange the installation sequence of these parts can easily lead to damage, interference, and jamming. Therefore, a safe and reliable assembly method for the propeller hub 8 is essential for improving its assembly quality and ensuring the reliability of the controllable pitch propeller. This, in turn, can extend the service life of the propeller hub 8 and reduce its failure rate.

[0062] The propeller hub mainly consists of parts such as the propeller housing 4, piston rod 3, crank disc 1, and slider 2. Other parts in the propeller hub 8 that are not closely related to this patent will not be described in detail here. This invention introduces an assembly method for the propeller hub 8, which can guide enterprises in assembling the propeller hub 8. The method includes the following steps:

[0063] Step 1: Fit the crank plate 1 and slider 2 and measure the gap between them: Measure the outer circle 12 of the crank pin 11 on the crank plate 1, and fit the inner hole 21 of the slider 2 so that the gap between the outer circle 12 and the inner hole 21 of the slider is 0.01~0.10mm.

[0064] Step 2: Grind the piston rod 3 and slider 2 and measure the gap between them: Grind the slider groove 31 of the piston rod 3 and check it with a standard plane to ensure that the contact area between the top surface 311 and the bottom surface 312 of the slider groove 31 and the standard plane is ≥75%, and there are no less than 5 contact spots in an area of ​​25mm×25mm; Grind the top surface 22 and the bottom surface 23 of the slider 2 to ensure that they are in uniform contact with the top surface 311 and the bottom surface 312 of the groove, and the contact area is not less than 75%, and the gap between the slider and the slider groove is 0.02~0.15mm;

[0065] Step 3: Assemble the propeller housing 4, crank plate 1 and slider 2: First, place the small end 41 of the propeller housing 4 downwards on the hollow bracket 5. Then, install the crank plate 1 on the propeller housing 4, so that the center line of the crank pin 11 on the crank plate 1 and the axis of the propeller housing 4 are in the same vertical plane. Then, position the crank pin 11 near the large end 42 of the propeller housing 4. Then, use the clamping plate 6 and clamping screw 7 to lock the crank plate 1. Finally, install the slider 2 on the crank pin 11.

[0066] Step 4: Assemble piston rod 3: First, install two eye bolts 33 on the upper end of piston rod 3. Then, use the eye bolts 33 to connect the equipment and fix piston rod 3 to the upper end of propeller housing 4. Next, install piston rod 3 into propeller housing 4. Then, use a jack to hold piston rod 3 at the lower end so that the center line of piston rod 3 is perpendicular to hollow bracket 5 and the center line of slider groove 31 is in the same plane as the center of propeller housing 4. Slowly lower piston rod 3. After slider 2 and crank pin 11 enter slider groove 31, remove clamping plate 6 of locking crank disc 1 and adjust jack to slowly lower piston rod 3. After it has fallen to the appropriate position, use clamping plate 6 to lock crank disc 1.

[0067] This invention introduces an assembly method for a propeller hub 8, which scientifically and rationally sets the inspection index for the assembly gap and uses a simple and easy-to-implement method to ensure the assembly gap. This method can reliably guarantee the assembly quality of the propeller hub 8, improve the reliability and service life of the controllable pitch propeller, and can be widely used in the manufacturing of controllable pitch propellers.

[0068] Example 1:

[0069] Please see Figure 1 — Figure 5 A method for assembling a propeller hub, the method comprising the following steps:

[0070] Step 1: First, measure the diameter of the outer circle 12 of the crank pin 11 on the crank plate 1. Then, modify the inner wall of the inner hole 21 of the slider 2 to match the outer circle 12. Then, perform the measurement steps: First, fit the inner hole 21 onto the outer circle 12. Then, measure the gap between the outer circle 12 and the inner hole 21. If the gap does not meet the inspection standard, separate the inner hole 21 and the outer circle 12. Then, modify the inner wall of the inner hole 21. Repeat the above measurement steps until the gap meets the inspection standard. Then, separate the outer circle 12 and the inner hole 21 to end Step 1.

[0071] Step 2: First, repair the top surface 311 and bottom surface 312 of the slider groove 31 on the piston rod 3 to meet the requirements; then repair the top surface 22 and bottom surface 23 of the slider 2 to meet the requirements; then place the slider 2 into the slider groove 31, aligning the top surface 22 of the slider with the top surface 311 of the groove and the bottom surface 23 of the slider with the bottom surface 312 of the groove. Then perform the measurement steps: first measure the gap between the top surface 22 of the slider and the top surface 311 of the groove, then measure the gap between the bottom surface 23 of the slider and the bottom surface 312 of the groove. If the gap does not meet the inspection standard, separate the slider groove 31 and the slider 2, and repair one or more of the top surface 22 of the slider, the top surface 311 of the groove, the bottom surface 23 of the slider, or the bottom surface 312 of the groove. Repeat the above measurement steps until the gap meets the inspection standard. Then separate the slider groove 31 and the slider 2 to end Step 2.

[0072] Step 3: First connect the propeller housing 4 to the hollow bracket 5, then install the crank plate 1 on the propeller housing 4, then fix the crank pin 11 to the upper end of the crank plate 1, then fix the clamping plate 6 to the crank plate 1, and then put the slider 2 on the outside of the outer circle 12 to end the third step.

[0073] Step 4: First, lower the piston rod 3 into the propeller housing 4. After the slider 2 and crank pin 11 enter the slider groove 31, remove the clamping plate 6. Then, lower the piston rod 3. The vertical movement stroke of the slider 2 and crank pin 11 is synchronized with the piston rod 3. After the piston rod 3 reaches the appropriate position, stop lowering. Then, fix the clamping plate 6 and crank disc 1 to end step 4.

[0074] Example 2:

[0075] The basic content is the same as in Example 1, except that:

[0076] Please see Figure 1 — Figure 2 In the first step, the inspection standard for the gap between the outer circle 12 and the inner hole 21 is 0.01 to 0.1 mm.

[0077] In application, if the gap between the outer circle 12 and the inner hole 21 is less than 0.01mm, the distance between the outer circle 12 and the inner hole 21 is too close. When the outer circle 12 rotates, there will be a lot of friction between the outer wall of the outer circle 12 and the inner wall of the inner hole 21, which will easily cause wear on the outer circle 12 and the inner hole 21. If the gap between the outer circle 12 and the inner hole 21 is between 0.01 and 0.1mm, the outer circle 12 can rotate freely in the inner hole 21 without affecting the rotational accuracy of the mechanism. If the gap between the outer circle 12 and the inner hole 21 is greater than 0.1mm, the distance between the outer circle 12 and the inner hole 21 is too large, resulting in an insufficiently tight connection between the outer circle 12 and the inner hole 21, which will cause a decrease in the accuracy of the propeller hub 8 mechanism.

[0078] Example 3:

[0079] The basic content is the same as in Example 1, except that:

[0080] Please see Figure 1 — Figure 2 In the second step, after repairing the top surface 311 and bottom surface 312 of the tank, a standard plate is used to inspect the top surface 311 and bottom surface 312. The requirements for the top surface 311 in the second step are: the contact area between the top surface 311 and the standard plate is greater than or equal to 75%, and there are at least 5 contact points between the top surface 311 and the standard plate within a 25mm × 25mm area. The requirements for the bottom surface 312 in the second step are: the contact area between the bottom surface 312 and the standard plate is greater than or equal to 75%, and there are at least 5 contact points between the bottom surface 312 and the standard plate within a 25mm × 25mm area. In the first step, the requirements for the top surface 22 of the slider are: the contact area between the top surface 22 of the slider and the top surface 311 of the groove is greater than or equal to 75%, and the contact between the top surface 22 of the slider and the top surface 311 of the groove is uniform; in the second step, the requirements for the bottom surface 23 of the slider are: the contact area between the bottom surface 23 of the slider and the bottom surface 312 of the groove is greater than or equal to 75%, and the contact between the bottom surface 23 of the slider and the bottom surface 312 of the groove is uniform; in the second step, the gap distance between the top surface 22 of the slider and the top surface 311 of the groove is 0.02 to 0.15 mm; in the second step, the gap distance between the bottom surface 23 of the slider and the bottom surface 312 of the groove is 0.02 to 0.15 mm.

[0081] In application, first apply a uniform layer of blue oil to the inspection surface of the standard plate. Then, with the inspection surface facing the top surface 311 of the tank, rub the inspection surface and the top surface 311 together. After rubbing, separate the inspection surface and the top surface 311. Then check whether the area of ​​blue oil on the top surface 311 is greater than 75% of the total area, and then determine whether the number of contact spots is greater than five. Both of these requirements must be met. If the above two requirements are not met, wipe off the blue oil and repair the top surface 311 to meet the above two requirements. Then, inspect and repair the bottom surface 312 of the groove according to the same steps as above; then repair the top surface 22 and the bottom surface 23 of the slider, then place the top surface 22 of the slider and the top surface 311 of the groove opposite each other, and then check whether the top surface 22 of the slider and the top surface 311 of the groove are in uniform contact and whether the contact area is greater than or equal to 75%. If the above two requirements are not met, separate the top surface 22 of the slider and the top surface 311 of the groove, and then repair the top surface 22 of the slider to meet the requirements; inspect the bottom surface 23 of the slider according to the same steps as above to make it meet the requirements.

[0082] Example 4:

[0083] The basic content is the same as in Example 1, except that:

[0084] Please see Figure 1 — Figure 4 In the third step, the small end 41 of the propeller housing 4 is connected to the top surface of the hollow support 5; in the third step, the crank disc 1 is installed at the opening 43 of the propeller housing 4, with the end of the crank disc 1 away from the crank pin 11 facing the outside of the propeller housing 4; the crank pin 11 is fixed to the upper part of the crank disc 1 near the large end 42 of the propeller housing 4, and the center line of the crank pin 11 is on the same plane as the center of the propeller housing 4; in the third step, the clamping plate 6 is provided with a fixing hole 61, which is a through hole; the crank disc 1 is provided with a screw hole 13, which is a countersunk hole opening towards the fixing hole 61; the same clamping screw 7 passes through the fixing hole 61 and is screwed into the screw hole 13.

[0085] In application, the small end 41 is placed on the top surface of the hollow bracket 5, and the large end 42 faces upward, so that the piston rod 3 can enter the interior of the propeller housing 4 from the large end 42. When installing the crank plate 1, the crank pin 11 is oriented towards the interior of the propeller housing 4, which facilitates the subsequent installation of the crank pin 11 and the slider 2. The fixed position of the crank pin 11 is located on the top of the crank plate 1 near the large end 42, so the position of the crank pin 11 corresponds to the position of the slider groove 31, which facilitates the crank pin 11 and the slider 2 to enter the slider groove 31 during the descent of the slider groove 31.

[0086] Example 5:

[0087] The basic content is the same as in Example 1, except that:

[0088] See Figure 1 — Figure 5 In the fourth step, the upper end of the piston rod 3 is provided with two threaded holes 32. The threaded holes 32 are countersunk holes that open one way upwards towards the piston rod 3. A lifting eye screw 33 is screwed into the threaded holes 32. In the fourth step, the center line of the piston rod 3 is perpendicular to the plane where the hollow support 5 is located, and the center line of the slider groove 31 is on the same plane as the center of the paddle housing 4. When the piston rod 3 descends to the point where the center of the crank pin 11 and the center of the crank disc 1 are on the same horizontal plane, the piston rod 3 stops descending.

[0089] In application, first screw the eye bolts 33 into the threaded holes 32 in sequence, then connect the eye bolts 33 to the equipment in sequence to fix the piston rod 3 above the paddle housing 4. Then make the center line of the piston rod 3 perpendicular to the plane of the hollow support 5, that is, the piston rod 3 is in a vertical state. Then make the center line of the slider groove 31 and the center of the paddle housing 4 in the same plane, that is, the piston rod 3 is on the center line of the paddle housing 4. Then slowly lower the piston rod 3 into the paddle housing 4 until the slider 2 and the crank pin 11 enter the slider groove 31. Then continue to lower the piston rod 3. The slider 2 follows the crank pin 11 to rotate around the center of the crank disk 1. The vertical movement of the slider 2 following the crank pin 11 is synchronized with the descent of the slider groove 31 until the center of the crank pin 11 coincides with the center of the crank disk 1, and then the piston rod stops descending.

[0090] 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 method for assembling a propeller hub, characterized in that: The method includes the following steps: Step 1: First, measure the diameter of the outer circle (12) of the crank pin (11) on the crank plate (1). Then, modify the inner wall of the inner hole (21) of the slider (2) to match the outer circle (12) to a cylindrical shape. Then, perform the measurement steps: First, put the inner hole (21) on the outer circle (12). Then measure the gap between the outer circle (12) and the inner hole (21). If the gap does not meet the inspection standard, separate the inner hole (21) and the outer circle (12). Then, modify the inner wall of the inner hole (21). Repeat the above measurement steps until the gap meets the inspection standard. Then, separate the outer circle (12) and the inner hole (21) to end the first step. Step 2: First, repair the top surface (311) and bottom surface (312) of the slider groove (31) on the piston rod (3) to meet the requirements; then repair the top surface (22) and bottom surface (23) of the slider (2) to meet the requirements; then put the slider (2) into the slider groove (31), so that the top surface (22) of the slider is aligned with the top surface (311) of the groove and the bottom surface (23) of the slider is aligned with the bottom surface (312) of the groove, and then perform the measurement steps: first measure the top surface (22) of the slider and the top surface of the groove. The gap value between (311) is measured, and then the gap value between the bottom surface of the slider (23) and the bottom surface of the groove (312) is measured. If the gap value does not meet the inspection standard, the slider groove (31) and the slider (2) are separated, and one or more of the top surface of the slider (22), the top surface of the groove (311), the bottom surface of the slider (23) or the bottom surface of the groove (312) are repaired. The aforementioned measurement steps are repeated until the gap value meets the inspection standard. Then the slider groove (31) and the slider (2) are separated, and the second step is ended. Step 3: First connect the propeller housing (4) to the hollow bracket (5), then install the crank plate (1) on the propeller housing (4), then fix the crank pin (11) to the upper end of the crank plate (1), then fix the clamping plate (6) to the crank plate (1), then put the slider (2) on the outside of the outer circle (12) to end the third step; Step 4: First, lower the piston rod (3) into the propeller housing (4). After the slider (2) and crank pin (11) enter the slider groove (31), remove the clamping plate (6). Then lower the piston rod (3). The vertical movement of the slider (2) and crank pin (11) is synchronized with the piston rod (3). After the piston rod (3) reaches the appropriate position, stop lowering. Then fix the clamping plate (6) and crank disc (1) to end Step 4. In the first step, the standard for checking the gap between the outer circle (12) and the inner hole (21) is 0.01 to 0.1 mm; In the second step, after repairing the top surface (311) and bottom surface (312) of the tank, the top surface (311) and bottom surface (312) of the tank are inspected using a standard plate. In the second step, the requirements for the top surface (311) of the groove are: the contact area between the top surface (311) of the groove and the standard plate is greater than or equal to 75%, and the top surface (311) of the groove and the standard plate have no less than 5 contact spots within an area of ​​25mm×25mm. In the second step, the requirements for the bottom surface (312) of the tank are: the contact area between the bottom surface (312) of the tank and the standard plate is greater than or equal to 75%, and the contact spots between the bottom surface (312) of the tank and the standard plate within an area of ​​25mm×25mm are not less than 5 points; In the second step, the requirements for the top surface (22) of the slider are: the contact area between the top surface (22) of the slider and the top surface (311) of the groove is greater than or equal to 75%, and the top surface (22) of the slider and the top surface (311) of the groove are in uniform contact; In the second step, the requirements for the bottom surface (23) of the slider are: the contact area between the bottom surface (23) of the slider and the bottom surface (312) of the groove is greater than or equal to 75%, and the contact between the bottom surface (23) of the slider and the bottom surface (312) of the groove is uniform; In the second step, the standard for checking the gap between the top surface (22) of the slider and the top surface (311) of the groove is 0.02 to 0.15 mm; In the second step, the standard for checking the gap between the bottom surface (23) of the slider and the bottom surface (312) of the groove is 0.02 to 0.15 mm; In the fourth step, the center line of the piston rod (3) is perpendicular to the plane of the hollow support (5), and the center line of the slider groove (31) is on the same plane as the center of the paddle housing (4). When the piston rod (3) descends to the point where the center of the crank pin (11) and the center of the crank disc (1) are on the same horizontal plane, the piston rod (3) stops descending.

2. The method for assembling a propeller hub according to claim 1, characterized in that: In the third step, the small end (41) of the propeller shell (4) is connected to the top surface of the hollow support (5).

3. The method for assembling a propeller hub according to claim 2, characterized in that: In the third step, the crank disc (1) is installed at the opening (43) of the propeller housing (4), and the end of the crank disc (1) away from the crank pin (11) faces the outside of the propeller housing (4); The crank pin (11) is fixed on the upper part of the crank disc (1) near the large end (42) of the propeller housing (4), and the center line of the crank pin (11) is on the same plane as the center of the propeller housing (4).

4. The method for assembling a propeller hub according to claim 3, characterized in that: In the third step, the clamping plate (6) is provided with a fixing hole (61), which is a through hole; the crank plate (1) is provided with a screw hole (13), which is a countersunk hole that opens toward the fixing hole (61); the same clamping screw (7) passes through the fixing hole (61) and is screwed into the screw hole (13).

5. The method for assembling a propeller hub according to claim 1, characterized in that: In the fourth step, the piston rod (3) is provided with two threaded holes (32) at its upper end. The threaded holes (32) are countersunk holes that open one way upwards towards the piston rod (3). A lifting eye screw (33) is screwed into the threaded holes (32).

Images