A propeller blade installation device and its usage method

Abstract

The present invention discloses a propeller blade installation device and a method for using the same, including a screw rod, a propeller blade body, an electric screwdriver, and fastening bolts. Three propeller blade bodies are fixedly installed at the top of the screw rod, and the propeller blade bodies and the screw rod are fixed by multiple groups of fastening bolts. The fastening bolts are tightened by an electric screwdriver. Two groups of guide grooves are sleeved on the surface of the propeller blade body, and multiple groups of transmission mechanisms are movably arranged inside the guide grooves; through the arranged guide grooves, installation buckles, collars, etc., the device effectively avoids the problem that due to the large radian between the blade root and the blade, the installation position of the bolts is relatively narrow, and the electric screwdriver cannot vertically insert the bolts for fixation, and it is necessary to use a wrench to engage the outer wall of the bolts for rotation and fixation, and the operation is relatively cumbersome, improving the convenience and flexibility of the staff in use.

Description

Technical Field

[0001] The present invention relates to a propeller blade installation device and a method for using the same. Background Art

[0002] A propeller refers to a device that converts the rotational power of an engine into a propulsive force by the rotation of the blades in air or water. It can have two or more blades connected to a hub. The rear surface of the blade is a helical surface or approximately a helical surface. Generally, a propeller has 2 to 4 blades. The blade is a device that converts the rotational power of the engine into a propulsive force. The blade is connected to the hub, and the rear surface of the blade is a helical surface or approximately a helical surface. The more blades there are, the more power can be absorbed. Blades are mostly made of aluminum alloy and steel, which is beneficial to improving the efficiency of the propeller at high speeds and is the main component of the propeller.

[0003] In the design process of the propeller blade, in order to reduce the air resistance suffered at the connection between the screw rod and the propeller blade during rotation, the installation end of the propeller blade, that is, the root position of the blade, is mostly set as a uniformly slender cylindrical shape and gradually increases from the root to the blade according to a certain rule, so as to achieve the purpose of less resistance at the root position during the rotation of the screw rod to save fuel. However, during the installation process of the propeller blade, due to the large curvature between the root and the blade, the installation position of the bolt is relatively narrow, and the electric screwdriver cannot vertically insert the bolt for fixation. It is necessary to use a wrench to engage the outer wall of the bolt for rotation and fixation. The operation is relatively cumbersome, and the convenience of the device is not strong. Therefore, we propose a propeller blade installation device and a method for using the same. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a propeller blade installation device and a method for using the same, which are convenient to use and have good flexibility: by moving the guiding groove, two groups of guiding grooves are sleeved on the surface of the propeller blade body. By adjusting the position of the transmission mechanism on the guiding groove, the transmission mechanism is meshed with the fastening bolt. The electric screwdriver is sequentially matched with the transmission mechanism to fasten the fastening bolt. If the electric screwdriver cannot be directly matched with the transmission mechanism due to model problems, it can be meshed with the transmission mechanism through the fastening mechanism, and the fastening bolt is fastened through the electric screwdriver and the transmission mechanism, improving the flexibility and convenience of the operation.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: A propeller blade installation device and its usage method, including a screw rod, a propeller blade body, an electric screwdriver, and fastening bolts. Three propeller blade bodies are fixedly installed at the top of the screw rod, and the propeller blade bodies and the screw rod are fixed by multiple groups of fastening bolts. The fastening bolts are tightened by an electric screwdriver. Two groups of guide grooves are sleeved on the surface of the propeller blade body, and multiple groups of transmission mechanisms are movably arranged inside the guide grooves. The output ends of the transmission mechanisms can all be engaged with the fastening bolts. A fastening mechanism is movably arranged outside the guide grooves, and the fastening mechanism can be engaged with multiple groups of transmission mechanisms respectively, and the fastening bolts are tightened through the electric screwdriver and the transmission mechanisms.

[0006] As a preferred technical solution of the present invention, the transmission mechanism includes several groups of mounting buckles slidably arranged on the inner and outer side walls of the guide grooves. A collar is connected to the bottom ends of the inner and outer two groups of mounting buckles at the same horizontal position. A universal joint is fixedly installed inside the collar, and a bolt fastener engaged with the fastening bolt is fixedly installed at the end of the universal joint.

[0007] As a preferred technical solution of the present invention, a limiting shell is fixedly installed inside the collar, and the limiting shells are all sleeved on the surface of the universal joint to limit the angle of the universal joint.

[0008] As a preferred technical solution of the present invention, the fastening mechanism includes a slider slidably arranged inside the guide groove, and a rotating rod penetrates through the middle of the slider. The rotating rods can all rotate under the restriction of the sliders. Arc-shaped grooves are formed on the top and bottom surfaces of the guide groove, and the arc-shaped grooves are all penetrated by the rotating rods. The bottom ends of the rotating rods are engaged with the top ends of the universal joints, and the top ends of the rotating rods are engaged with the output ends of the electric screwdrivers.

[0009] As a preferred technical solution of the present invention, driven gears are fixedly installed at the top ends of the universal joints, and driving gears engaged with the driven gears are fixedly installed at the bottom ends of the rotating rods.

[0010] As a preferred technical solution of the present invention, clamping grooves are formed on both sides of the outer wall of the slider, and clamping rails engaged with the clamping grooves are integrally formed on both sides of the inner wall of the guide groove.

[0011] As a preferred technical solution of the present invention, annular rotating grooves are formed in the middle of the inner wall of the slider, and rotating rings are rotatably arranged inside the rotating grooves. Multiple groups of limiting blocks are arranged around the inner wall of the rotating rings. Spring grooves with the same number and corresponding positions as the limiting blocks are formed on the outer wall surface of the rotating rods, and the rotating grooves are movably arranged on the inner wall of the spring grooves.

[0012] As a preferred technical solution of the present invention, guide rods are vertically arranged in the middle of the inner wall of the spring grooves, and the guide rods all penetrate through the middle of the limiting blocks.

[0013] As a preferred technical solution of the present invention, a spring is wound around the surface of the guide rod, and one end of the spring is connected to the bottom surface of the limit block, and the other end is connected to the bottom end of the inner wall of the spring groove.

[0014] The present invention also provides a technical solution, a method for using a propeller blade installation device, and the specific steps are as follows:

[0015] S1. Move the two guide grooves so that the two guide grooves are sleeved on the outer wall surface of the propeller blade body;

[0016] S2. Rotate the limit shell so that the limit shell drives the two installation buckles to rotate under the restriction of the guide groove through the collar. The limit shell drives the bolt fastener to rotate to a position corresponding to the fastening bolt, and the bolt fastener is engaged with the fastening bolt;

[0017] S3. Move the electric screwdriver so that the output end of the electric screwdriver is nested on the top end of the rotating rod and pressed down, so that the rotating rod moves under the restriction of the slider and drives the driving gear to mesh with the driven gear;

[0018] S4. Start the electric screwdriver so that the output end of the electric screwdriver drives the rotating rod to rotate. The rotating rod drives the rotating ring to rotate under the restriction of the rotating groove through the spring groove and the limit block. The rotating rod can drive the driving gear to rotate without driving the slider to rotate. The driving gear transmits the torque to the universal joint through the driven gear, and the torque is transmitted to the bolt fastener through the universal joint, and the bolt fastener can fasten the fastening bolt;

[0019] S5. After one fastening bolt is fastened, lift the electric screwdriver so that it no longer presses down the rotating rod. The elastic deformation of the spring is restored to push the rotating rod upward, and the rotating rod drives the driving gear upward so that it no longer meshes with the driven gear;

[0020] S6. Then rotate the rotating rod so that the rotating rod drives the slider to move to a specified position under the restriction of the guide groove, and the driving gear below the rotating rod moves to a position corresponding to another driven gear. Repeat the operation S4 to fasten another fastening bolt. After all the fastening bolts are fastened, the installation of the propeller blade body can be completed.

[0021] Compared with the prior art, the beneficial effects that the present invention can achieve are:

[0022] 1. The device, through the provided guiding grooves, mounting buckles, collars, etc., effectively avoids the problem that due to the large curvature between the blade root and the blade, the installation position of the bolt is relatively narrow, and the electric screwdriver cannot vertically insert the bolt for fixation. Instead, a wrench needs to be used to engage with the outer wall of the bolt for rotation and fixation, which is a rather cumbersome operation. The bolt fastener can be restricted to rotate in the guiding groove and adapt to the fastening bolts at different positions. Then, the torque generated by the rotation of the electric screwdriver is transmitted to the bolt fastener through the universal joint, and the fastening bolt is tightened by the bolt fastener. The electric screwdriver can tighten the fastening bolt at a position other than above the fastening bolt, achieving the purpose that the use of the electric screwdriver is not restricted by the size, position, and shape of the propeller blade body, and improving the convenience and flexibility of the staff's use.

[0023] 2. The device, through the provided sliders, rotating rods, driving gears, etc., effectively avoids the problem that the electric screwdriver cannot be directly connected to the transmission mechanism due to model problems. By rotating the rotating rod, the rotating rod drives the slider to move within the restriction of the guiding groove and engage with the transmission mechanism. Then, through the cooperation of the electric screwdriver and the rotating rod, the universal joint is driven to rotate and the bolt fastener drives the fastening bolt to rotate, thereby achieving the purpose of improving the usage method of the device and further enhancing the flexibility and applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 is a front view structural schematic diagram of the present invention;

[0026] Figure 3 is a three-dimensional structural schematic diagram of the connection state of the driven gear and the universal joint of the present invention;

[0027] Figure 4 is a partial top view sectional structural schematic diagram of the guiding groove of the present invention;

[0028] Figure 5 is a top view sectional structural schematic diagram of the present invention;

[0029] Figure 6 is of the present invention Figure 2 magnified schematic diagram of the structure at A;

[0030] Figure 7 is of the present invention Figure 4 magnified schematic diagram of the structure at B;

[0031] Figure 8 is of the present invention Figure 5 magnified schematic diagram of the structure at C;

[0032] Figure 9 is of the present inventionFigure 8 Schematic enlarged view of the structure at position D in the [device].

[0033] Wherein: 1. Screw rod; 2. Propeller blade body; 3. Electric screwdriver; 4. Fastening bolt; 51. Guide groove; 52. Mounting buckle; 53. Collar; 54. Limiting shell; 55. Driven gear; 56. Universal joint; 57. Bolt fastener; 61. Slide block; 62. Rotating rod; 63. Driving gear; 71. Card slot; 72. Card rail; 81. Spring groove; 82. Guide rod; 83. Rotating groove; 84. Rotating ring; 85. Limiting block; 86. Spring. Detailed implementation manners

[0034] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention. The experimental methods in the following embodiments are all conventional methods unless otherwise specified. The materials, reagents, etc. used in the following embodiments can all be obtained from commercial channels unless otherwise specified.

[0035] Embodiment:

[0036] As Figure 1 - Figure 9 shown, this embodiment proposes a propeller blade installation device, including a screw rod 1, a propeller blade body 2, an electric screwdriver 3 and a fastening bolt 4. Three propeller blade bodies 2 are fixedly installed at the top end of the screw rod 1, and the propeller blade bodies 2 and the screw rod 1 are fixed by multiple groups of fastening bolts 4. The fastening bolts 4 are tightened by the electric screwdriver 3. Two groups of guide grooves 51 are sleeved on the surface of the propeller blade body 2, and multiple groups of transmission mechanisms are movably arranged inside the guide grooves 51. The output ends of the transmission mechanisms can all be engaged with the fastening bolts 4. A fastening mechanism is movably arranged outside the guide grooves 51, and the fastening mechanism can be engaged with multiple groups of transmission mechanisms respectively, and the fastening bolts 4 are tightened by the electric screwdriver 3 and the transmission mechanisms;

[0037] Wherein the transmission mechanism includes a plurality of groups of mounting buckles 52 slidably arranged on the inner and outer side walls of the guide groove 51. The inner and outer two groups of mounting buckles 52 at the same horizontal position are connected at the bottom end with a collar 53. A universal joint 56 is fixedly installed inside the collar 53, and a bolt fastener 57 engaged with the fastening bolt 4 is fixedly installed at the end of the universal joint 56;

[0038] A limiting shell 54 is fixedly installed inside the collar 53, and the limiting shells 54 are all sleeved on the surface of the universal joint 56 to limit the angle of the universal joint 56. By the limitation of the limiting shell 54, it is avoided that the angle of the universal joint 56 deviates during rotation, resulting in abnormal transmission;

[0039] When the device is needed to tighten the fastening bolt 4, by moving the guide groove 51, the two guide grooves 51 are sleeved on the outer wall surface of the propeller blade body 2, and then the limiting shell 54 is rotated. The limiting shell 54 drives the two mounting buckles 52 to move on the surface of the guide groove 51 through the collar 53. The limiting shell 54 drives the bolt fastener 57 to move to a position corresponding to the fastening bolt 4 through the universal joint 56, and the fastening bolt 4 and the bolt fastener 57 are meshed with each other. Then, the electric screwdriver 3 is meshed with the top end of the universal joint 56 and the electric screwdriver 3 is started. The torque generated by the electric screwdriver 3 is transmitted to the bolt fastener 57 through the universal joint 56, so that the bolt fastener 57 can rotate synchronously with the output end of the electric screwdriver 3 and tighten the fastening bolt 4. After repeating the above operations to complete the tightening of all the fastening bolts 4, the installation of the propeller blade body 2 can be completed.

[0040] The fastening mechanism includes a slider 61 slidably arranged inside the guide groove 51, and a rotating rod 62 is arranged through the middle of the slider 61. The rotating rods 62 can all rotate under the limitation of the slider 61. Card slots 71 are formed on both sides of the outer wall of the slider 61, and card rails 72 that are meshed with the card slots 71 are integrally formed on both sides of the inner wall of the guide groove 51. Through this design, when the slider 61 rotates inside the guide groove 51, the guide groove 51 can limit the position of the card slot 71 through the card rail 72. Due to the limitation of the card slot 71, the slider 61 cannot move longitudinally inside the guide groove 51, so as to improve the stability of the slider 61 during movement. Arc-shaped grooves are formed on the top and bottom surfaces of the guide groove 51, and the arc-shaped grooves are all penetrated by the rotating rod 62. The bottom ends of the rotating rods 62 are meshed with the top ends of the universal joints 56, and the top ends of the rotating rods 62 are meshed with the output ends of the electric screwdrivers 3;

[0041] When the electric screwdriver 3 needs to use the fastening mechanism to cooperate with the transmission mechanism for connection, by moving the rotating rod 62, the rotating rod 62 drives the slider 61 to rotate under the limitation of the guide groove 51. When the rotating rod 62 rotates to a proper position, the bottom end of the rotating rod 62 is connected to the top end of the universal joint 56, and then the electric screwdriver 3 is moved to connect the electric screwdriver 3 with the top end of the rotating rod 62. The output end of the electric screwdriver 3 transmits the torque to the universal joint 56 through the rotating rod 62 and completes the fastening to the fastening bolt 4 through the bolt fastener 57 and the universal joint 56.

[0042] In order to make the connection between the bottom end of the rotating rod 62 and the top end of the universal joint 56 more stable, driven gears 55 are fixedly installed at the top ends of the universal joints 56, and driving gears 63 meshing with the driven gears 55 are fixedly installed at the bottom ends of the rotating rods 62. The torque transmitted by the electric screwdriver 3 through the rotating rod 62 can be transmitted to the driven gear 55 through the driving gear 63 and then transmitted to the universal joint 56 through the driven gear 55;

[0043] In order to make the meshing between the driving gear 63 and the driven gear 55 more convenient, annular rotating grooves 83 are provided in the middle of the inner walls of the sliders 61, and rotating rings 84 are rotatably arranged inside the rotating grooves 83. A plurality of groups of limiting blocks 85 are arranged around the inner walls of the rotating rings 84. Spring grooves 81 with the same number and corresponding positions as the limiting blocks 85 are provided on the outer wall surfaces of the rotating rods 62. The rotating grooves 83 are movably arranged on the inner walls of the spring grooves 81. Guide rods 82 are vertically arranged in the middle of the inner walls of the spring grooves 81, and the guide rods 82 penetrate through the middle parts of the limiting blocks 85. Springs 86 are wound around the surfaces of the guide rods 82. One end of each spring 86 is connected to the bottom surface of the corresponding limiting block 85, and the other end is connected to the bottom end of the inner wall of the corresponding spring groove 81. When the driving gear 63 is needed for transmission, the electric screwdriver 3 is sleeved on the top end of the rotating rod 62 and meshed. At the same time, the electric screwdriver 3 is pressed down to drive the rotating rod 62 to drive the spring groove 81 and the driving gear 63 to descend. As the spring groove 81 descends, the distance between the bottom end of the limiting block 85 and the bottom end of the inner wall of the spring groove 81 extends, and the spring 86 is pulled to generate elastic deformation. At the same time, the driving gear 63 can mesh with the driven gear 55. Then the electric screwdriver 3 is started to drive the rotating rod 62 to rotate. At the same time, the rotating rod 62 drives the limiting block 85 to rotate through the spring groove 81, so that the limiting block 85 drives the rotating ring 84 to rotate inside the rotating groove 83 under the restriction of the spring groove 81 and the guide rod 82. The rotation of the rotating rod 62 will not interfere with the slider 61. The rotating rod 62 drives the driven gear 55 to rotate through the driving gear 63 and is transmitted to the bolt fastener 57 through the universal joint 56 to fasten the fastening bolt 4. After the fastening is completed, the electric screwdriver 3 is lifted, and the rotating rod 62 automatically drives the driving gear 63 to separate from the driven gear 55 under the action of the elastic deformation recovery of the spring 86.

[0044] The usage method of the propeller blade installation device is as follows:

[0045] S1. Move the two groups of guide grooves 51 so that the two groups of guide grooves 51 are sleeved on the outer wall surface of the propeller blade body 2;

[0046] S2. Rotate the limiting shell 54 so that the limiting shell 54 drives the two groups of installation buckles 52 to rotate under the restriction of the guide grooves 51 through the collar 53. The limiting shell 54 drives the bolt fastener 57 to rotate to a position corresponding to the fastening bolt 4 and meshes the bolt fastener 57 with the fastening bolt 4;

[0047] S3. Move the electric screwdriver 3, nest the output end of the electric screwdriver 3 at the top of the rotating rod 62 and press down, so that the rotating rod 62 moves under the restriction of the slider 61 and drives the driving gear 63 to mesh with the driven gear 55;

[0048] S4. Start the electric screwdriver 3, so that the output end of the electric screwdriver 3 drives the rotating rod 62 to rotate. The rotating rod 62 drives the rotating ring 84 to rotate under the restriction of the rotating groove 83 through the spring groove 81 and the limiting block 85. The rotating rod 62 can drive the driving gear 63 to rotate without driving the slider 61 to rotate. The driving gear 63 conducts the torque to the universal joint 56 through the driven gear 55, and conducts the torque to the bolt fastener 57 through the universal joint 56. The bolt fastener 57 can fasten the fastening bolt 4;

[0049] S5. After one fastening bolt 4 is fastened, lift the electric screwdriver 3 so that it no longer presses down on the rotating rod 62. The elastic deformation of the spring 86 is restored to push the rotating rod 62 to rise. The rotating rod 62 drives the driving gear 63 to rise so that it no longer meshes with the driven gear 55;

[0050] S6. Then rotate the rotating rod 62, so that the rotating rod 62 drives the slider 61 to move to a specified position under the restriction of the guiding groove 51, and the driving gear 63 below the rotating rod 62 moves to a position corresponding to another driven gear 55. Repeat the operation S4 to fasten another fastening bolt 4. After all the fastening bolts 4 are fastened, the installation of the propeller blade body 2 can be completed.

[0051] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0052] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not restricted by the above-mentioned embodiments. The above-mentioned embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A propeller blade installation device, comprising a screw rod (1), a propeller blade body (2), an electric screwdriver (3) and fastening bolts (4). Three propeller blade bodies (2) are fixedly installed at the top end of the screw rod (1), and the propeller blade bodies (2) and the screw rod (1) are fixed by multiple groups of fastening bolts (4). The fastening bolts (4) are tightened by the electric screwdriver (3). Characterized in that: Two groups of guide grooves (51) are sleeved on the surface of the propeller blade body (2), and multiple groups of transmission mechanisms are movably arranged inside the guide grooves (51). The output ends of the transmission mechanisms can all be engaged with the fastening bolts (4). A fastening mechanism is movably arranged outside the guide grooves (51), and the fastening mechanism can be engaged with multiple groups of transmission mechanisms respectively, and the fastening bolts (4) are tightened through the electric screwdriver (3) and the transmission mechanisms. The transmission mechanism includes several groups of mounting buckles (52) slidably arranged on the inner and outer side walls of the guide grooves (51). A collar (53) is connected to the bottom ends of the inner and outer two groups of mounting buckles (52) at the same horizontal position. A universal joint (56) is fixedly installed inside the collar (53), and a bolt fastener (57) engaged with the fastening bolt (4) is fixedly installed at the end of the universal joint (56). A limiting shell (54) is fixedly installed inside the collar (53), and the limiting shell (54) is sleeved on the surface of the universal joint (56) to limit the angle of the universal joint (56). The fastening mechanism includes a slider (61) slidably arranged inside the guide groove (51), and a rotating rod (62) is arranged through the middle of the slider (61). The rotating rod (62) can rotate under the limitation of the slider (61). Arc-shaped grooves are formed on the top and bottom surfaces of the guide groove (51), and the rotating rod (62) passes through the arc-shaped grooves. The bottom ends of the rotating rods (62) are engaged with the top ends of the universal joints (56), and the top ends of the rotating rods (62) are engaged with the output ends of the electric screwdriver (3). Driven gears (55) are fixedly installed at the top ends of the universal joints (56), and driving gears (63) engaged with the driven gears (55) are fixedly installed at the bottom ends of the rotating rods (62). Card slots (71) are formed on both sides of the outer wall of the slider (61), and card rails (72) engaged with the card slots (71) are integrally formed on both sides of the inner wall of the guide groove (51).

2. A propeller blade installation device according to claim 1, Characterized in that: Circular rotating grooves (83) are formed in the middle of the inner walls of the sliders (61), and rotating rings (84) are rotatably arranged inside the rotating grooves (83). Multiple groups of limiting blocks (85) are arranged around the inner walls of the rotating rings (84). Spring grooves (81) with the same number and corresponding positions as the limiting blocks (85) are formed on the outer wall surfaces of the rotating rods (62). The rotating grooves (83) are movably arranged on the inner walls of the spring grooves (81).

3. A propeller blade installation device according to claim 2, Characterized in that: In the middle of the inner wall of the spring groove (81), a guide rod (82) is vertically arranged, and the guide rods (82) all penetrate through the middle of the limit blocks (85).

4. A propeller blade installation device according to claim 3, characterized in that: A spring (86) is wound around the surface of the guide rod (82), and one end of the spring (86) is connected to the bottom surface of the limit block (85), and the other end is connected to the bottom end of the inner wall of the spring groove (81).

5. A method for using a propeller blade installation device according to claim 4, characterized in that: S1. Move the two guide grooves (51) so that the two guide grooves (51) are sleeved on the outer wall surface of the propeller blade body (2); S2. Rotate the limit shell (54) so that the limit shell (54) drives the two installation buckles (52) to rotate under the limitation of the guide groove (51) through the collar (53). The limit shell (54) drives the bolt fastener (57) to rotate to a position corresponding to the fastening bolt (4), and the bolt fastener (57) is engaged with the fastening bolt (4); S3. Move the electric screwdriver (3) so that the output end of the electric screwdriver (3) is nested at the top of the rotating rod (62) and pressed down, so that the rotating rod (62) moves under the limitation of the slider (61) and drives the driving gear (63) to engage with the driven gear (55); S4. Start the electric screwdriver (3) so that the output end of the electric screwdriver (3) drives the rotating rod (62) to rotate. The rotating rod (62) drives the rotating ring (84) to rotate under the limitation of the rotating groove (83) through the spring groove (81) and the limit block (85). The rotating rod (62) can drive the driving gear (63) to rotate without driving the slider (61) to rotate. The driving gear (63) conducts the torque to the universal joint (56) through the driven gear (55), and conducts the torque to the bolt fastener (57) through the universal joint (56), and the bolt fastener (57) can fasten the fastening bolt (4); S5. After one fastening bolt (4) is fastened, lift the electric screwdriver (3) so that it no longer presses down on the rotating rod (62). The elastic deformation of the spring (86) is restored to push the rotating rod (62) to rise, and the rotating rod (62) drives the driving gear (63) to rise so that it no longer engages with the driven gear (55); S6. Then rotate the rotating rod (62) so that the rotating rod (62) drives the slider (61) to move to a specified position under the limitation of the guide groove (51), so that the driving gear (63) below the rotating rod (62) moves to a position corresponding to another driven gear (55), and repeat the operation S4 to fasten another fastening bolt (4). After all the fastening bolts (4) are fastened, the installation of the propeller blade body (2) can be completed.

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