A Helicopter Blade Connecting Bolt Installation Tool and Installation Method

Abstract

The present invention discloses a tool for installing a connecting bolt of a helicopter blade, which includes a first positioning member and a second positioning member. Both the first positioning member and the second positioning member include an equal-diameter section and a variable-diameter section connected along the axial direction. The diameter of the equal-diameter section matches the diameter of the positioning hole in the theoretical machining state, and the diameter of the variable-diameter section gradually decreases from the end connected to the equal-diameter section towards the direction away from the equal-diameter section. The present invention also provides a method for installing a connecting bolt of a helicopter blade. The tool for installing a connecting bolt of a helicopter blade according to the present invention can quickly align the through-hole positions of the blade root connecting member, the blade clamp sleeve, and the blade through the first positioning member and the second positioning member, form a positioning hole in an ideal state, and install the connecting bolt, greatly improving the assembly efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of helicopter assembly tooling, and particularly to a helicopter blade connection bolt installation tool and an installation method. Background Art

[0002] Small helicopters have good maneuverability, low prices, and can carry a variety of loads. Currently, they are the mainstream research and development direction. Small helicopters generally use teetering rotors. The blades are short and the centrifugal force is not large. The blade root connectors and blade sleeves are mainly connected by bolts.

[0003] Since multiple parts such as the blade root connector, blade sleeve, and blade need to be fixed with the same connection bolt, and there will be certain errors in the machining process of the positioning holes, the positioning and installation are relatively troublesome.

[0004] Therefore, it is necessary to design an auxiliary tool for installing the helicopter blade connection bolt to quickly align the hole positions for installation and improve the assembly efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide an auxiliary tool for installing the helicopter blade connection bolt to quickly align the hole positions for installation and improve the assembly efficiency. Another purpose of the present invention is to provide an installation method for the helicopter blade connection bolt to quickly align the hole positions for installation and improve the assembly efficiency.

[0006] To solve the above technical problems, the present invention provides a helicopter blade connection bolt installation tool, which includes a first positioning member and a second positioning member. Both the first positioning member and the second positioning member include an equal-diameter section and a variable-diameter section connected along the axial direction. The diameter of the equal-diameter section matches the diameter of the positioning hole in the theoretical machining state, and the diameter of the variable-diameter section gradually decreases from the end connected to the equal-diameter section towards the direction away from the equal-diameter section.

[0007] The process of installing the connection bolt with the helicopter blade connection bolt installation tool provided by the present invention is as follows: First, insert the first positioning member sequentially from the first end of the positioning hole into the blade root connector, blade sleeve, and inside the blade, and make the variable-diameter section of the first positioning member pass through the second end of the positioning hole; Secondly, axially abut the variable-diameter section of the second positioning member against the variable-diameter section of the first positioning member, and tap the second positioning member with a rubber hammer until the first positioning member is ejected and the variable-diameter section of the second positioning member passes through the first end of the positioning hole; Then, axially abut the connection bolt against the variable-diameter section of the second positioning member, and tap the connection bolt until the second positioning member is ejected and one end of the connection bolt passes through the second end of the positioning hole, and the other end of the connection bolt abuts against the end face of the first end of the positioning hole; Finally, fix the connection bolt with a fixing nut to connect the blade root connector, blade sleeve, and blade into one body.

[0008] Therefore, compared with the existing solution of directly passing the connecting bolt through the second end from the first end of the positioning hole, the helicopter blade connecting bolt installation tool of the present invention can quickly align the through-hole positions of the blade root connecting piece, the blade sleeve and the blade through the first positioning member and the second positioning member, form an ideal positioning hole, and install the connecting bolt, greatly improving the assembly efficiency.

[0009] Optionally, it further includes a head axially connected to the equal-diameter section, and the diameter of the head is greater than the diameter of the equal-diameter section.

[0010] Optionally, a first groove extending circumferentially is provided on the circumferential wall of the end of the equal-diameter section connected to the head.

[0011] Optionally, a second groove extending circumferentially is provided on the circumferential wall of the variable-diameter section.

[0012] Optionally, at least one of the first positioning member and the second positioning member is further provided with a threaded section axially connected to the variable-diameter section, and the diameter of the threaded section is smaller than the diameter of the equal-diameter section.

[0013] Optionally, a third groove extending circumferentially is further provided at the connection between the threaded section and the variable-diameter section.

[0014] Optionally, the first positioning member and the second positioning member are made of bolts.

[0015] The present invention also provides a method for installing a helicopter blade connecting bolt, including a positioning hole alignment method, and the positioning hole alignment method includes the following steps:

[0016] Insert the first positioning member sequentially from the first end of the positioning hole into the blade root connecting piece, the blade sleeve and the blade interior, and make the variable-diameter section of the first positioning member pass through the second end of the positioning hole;

[0017] Axially abut the variable-diameter section of the second positioning member against the variable-diameter section of the first positioning member, and tap the second positioning member until the first positioning member is ejected and the variable-diameter section of the second positioning member passes through the first end of the positioning hole.

[0018] The method for installing a helicopter blade connecting bolt of the present invention is applicable to the aforementioned helicopter blade connecting bolt installation tool, so it has the same technical effects as the aforementioned helicopter blade connecting bolt, which will not be elaborated here.

[0019] Optionally, when the second positioning member is provided with a threaded section axially connected to the variable-diameter section, the second positioning member serves as the connecting bolt; when the second positioning member does not include a threaded section, the method for installing a helicopter blade connecting bolt further includes:

[0020] Axially abut the connecting bolt against the reduced-diameter section of the second positioning member, and tap the connecting bolt until one end of the connecting bolt passes through the second end of the positioning hole, and the other end of the connecting bolt abuts against the end face of the first end of the positioning hole. Description of the Drawings

[0021] Figure 1 Schematic structural diagram of the first positioning member in a specific embodiment of the helicopter blade connecting bolt installation tool provided by the present invention;

[0022] Figure 2 Schematic structural diagram of the second positioning member in a specific embodiment of the helicopter blade connecting bolt installation tool provided by the present invention;

[0023] Figure 3 is Figure 1 the first positioning member and Figure 2 schematic structural diagram of the second positioning member during the working process;

[0024] Among them, Figures 1 to 3 the reference numeral descriptions are as follows:

[0025] 1 - First positioning member; 2 - Second positioning member; 11 - Equal-diameter section; 12 - Reduced-diameter section; 12' - Reduced-diameter section; 13 - Head; 14 - Threaded section; 1a - First groove; 1b - Second groove; 1c - Third groove;

[0026] 01 - Root connector; 02 - Blade jacket; 03 - Blade. Specific Embodiment

[0027] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0028] The terms "first", "second", etc. mentioned in this article are only for facilitating the description of two or more structures or components with the same or similar structures and / or functions, and do not represent a specific limitation on the order and / or importance.

[0029] In this article, the through holes corresponding to the root connector 01, the blade jacket 02, and the blade 03 and communicating with each other for installing the connecting bolt are collectively defined as the positioning holes.

[0030] Please refer to Figures 1 to 3 , Figure 1 Schematic structural diagram of the first positioning member in a specific embodiment of the helicopter blade connecting bolt installation tool provided by the present invention; Figure 2 Schematic structural diagram of the second positioning member in a specific embodiment of the helicopter blade connecting bolt installation tool provided by the present invention; Figure 3 is Figure 1The first positioning member and Figure 2 Schematic structural diagram of the second positioning member during operation.

[0031] The present invention provides a helicopter blade connection bolt installation tool, including a first positioning member 1 and a second positioning member 2. Both the first positioning member 1 and the second positioning member 2 include an equal-diameter section 11 and a variable-diameter section connected axially. The diameter of the equal-diameter section 11 matches the diameter of the positioning hole in the theoretical processing state, and the diameter of the variable-diameter section gradually decreases from the end connected to the equal-diameter section 11 towards the direction away from the equal-diameter section 11.

[0032] The helicopter blade connection bolt installation tool provided by the present invention installs the connection bolt as follows: First, insert the first positioning member 1 sequentially into the blade root connector 01, the blade clamp sleeve 02, and the blade 03 from the first end of the positioning hole, and the variable-diameter section 12 of the first positioning member 1 passes through the second end of the positioning hole; Second, axially abut the variable-diameter section 12' of the second positioning member 2 against the variable-diameter section 12 of the first positioning member 1, and tap the second positioning member 2 with a rubber hammer until the first positioning member 1 is pushed out and the variable-diameter section 12' of the second positioning member 2 passes through the first end of the positioning hole; Then, axially abut the connection bolt against the variable-diameter section 12' of the second positioning member 2, and tap the connection bolt until one end of the connection bolt passes through the second end of the positioning hole and the other end of the connection bolt abuts against the end face of the first end of the positioning hole; Finally, fix the connection bolt with a fixing nut to connect the blade root connector 01, the blade clamp sleeve 02, and the blade 03 into one body.

[0033] Therefore, the helicopter blade connection bolt installation tool of the present invention can quickly align the through-hole positions of the blade root connector 01, the blade clamp sleeve 02, and the blade 03 through the first positioning member 1 and the second positioning member 2, form an ideal positioning hole, and install the connection bolt, greatly improving the assembly efficiency.

[0034] Specifically, in this embodiment, the first positioning member 1 and the second positioning member 2 further include a head 13 axially connected to the equal-diameter section 11, and the diameter of the head 13 is greater than the diameter of the equal-diameter section 11.

[0035] This setting, on the one hand, is used to provide a bearing surface to bear the acting force of the rubber hammer; on the other hand, it can also play a limiting role to prevent the first positioning member 1 and the second positioning member 2 from being completely inserted into the positioning hole and unable to be taken out.

[0036] Further, in this embodiment, a first groove 1a extending circumferentially is provided on the circumferential wall of the equal-diameter section 11 at the end connected to the head 13. The first groove 1a is a process groove for facilitating processing.

[0037] In addition, a second groove 1b extending circumferentially is also provided on the circumferential wall of the variable-diameter section 12. The second groove 1b is a process groove for facilitating processing.

[0038] Please continue to refer to Figure 2 In this embodiment, the second positioning member 2 is further provided with a threaded section 14 axially connected to the reduced-diameter section 12'. The diameter of the threaded section 14 is smaller than the diameter of the equal-diameter section 11.

[0039] With this setting, during the installation of the connecting bolt, the first positioning member 1 can be first inserted sequentially into the hub connector 01, the blade clamp 02, and the blade 03 from the first end of the positioning hole, and the reduced-diameter section 12 of the first positioning member 1 passes through the second end of the positioning hole; secondly, the reduced-diameter section 12' of the second positioning member 2 is abutted against the reduced-diameter section 12 of the first positioning member 1, and the second positioning member 2 is tapped with a rubber hammer until the first positioning member 1 is pushed out; then, continue to tap the second positioning member 2 to make the threaded section 14 pass through the first end of the positioning hole and be fixed to the fixing nut, connecting the hub connector 01, the blade clamp 02, and the blade 03 into one body.

[0040] This setting can further streamline the installation steps and improve the installation efficiency.

[0041] Of course, when connecting the hub connector 01, the blade clamp 02, and the blade 03 through the second positioning member 2, it is necessary to calculate the structural strength of the second positioning member 2 to ensure that the hub connector 01, the blade clamp 02, and the blade 03 can be stably connected into one body and avoid safety accidents caused by fracture. In this embodiment, the length of the reduced-diameter section 12' of the second positioning member 2 is smaller than the length of the reduced-diameter section 12 of the first positioning member 1, which is also to prevent the reduced-diameter section 12' from being too thin and breaking. Therefore, when the second positioning member does not have the threaded section 14, the structures of the first positioning member 1 and the second positioning member 2 can be exactly the same.

[0042] In this embodiment, the second positioning member 2 is provided with a threaded section 14. In practical applications, a threaded section 14 can also be provided on the first positioning member 1. At this time, during installation, the second positioning member 2 can be installed first, then the first positioning member 1, and the second positioning member 2 can be knocked out of the positioning hole to connect the hub connector 01, the blade clamp 02, and the blade 03 through the second positioning member 2. Or, both the first positioning member 1 and the second positioning member 2 are provided with threaded sections 14. At this time, during installation, there is no need to limit the installation order of the first positioning member 1 and the second positioning member 2.

[0043] In addition, a third groove 1c extending axially is provided at the connection between the threaded section 14 and the reduced-diameter section 12'. This setting is mainly for process considerations and is convenient for processing.

[0044] In this embodiment, the first positioning member 1 and the second positioning member 2 are made of off-the-shelf bolts, and the process is simple. In practical applications, a cylindrical shaft body can also be processed into the structures of the first positioning member 1 and the second positioning member 2.

[0045] The present invention also provides a method for installing a helicopter blade connection bolt, including a method for aligning a positioning hole. The method for aligning a positioning hole includes the following steps:

[0046] Insert the first positioning member 1 sequentially into the inside of the blade root connecting member 01, the blade clamp 02, and the blade 03 from the first end of the positioning hole, and make the stepped diameter section 12 of the first positioning member 1 pass through the second end of the positioning hole;

[0047] Axially abut the stepped diameter section 12' of the second positioning member 2 against the stepped diameter section 12 of the first positioning member 1, and tap the second positioning member 2 until the first positioning member 1 is pushed out, and the stepped diameter section 12' of the second positioning member 2 passes through the first end of the positioning hole.

[0048] The method for installing a helicopter blade connection bolt of the present invention is applicable to the aforementioned helicopter blade connection bolt installation tool, and thus has the same technical effects as the aforementioned helicopter blade connection bolt, which will not be elaborated here.

[0049] Furthermore, when the second positioning member 2 is provided with a threaded section 14 axially connected to the stepped diameter section 12', the second positioning member can be used as a connection bolt; when the second positioning member 2 does not include the threaded section 14, the method for installing a helicopter blade connection bolt further includes:

[0050] Axially abut the connection bolt against the stepped diameter section 12' of the second positioning member 2, and tap the connection bolt until one end of the connection bolt passes through the second end of the positioning hole, and the other end of the connection bolt abuts against the end face of the first end of the positioning hole.

[0051] The above has introduced in detail a helicopter blade connection bolt installation tool and an installation method provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for installing a connecting bolt of a helicopter blade, characterized in that, the helicopter blade connecting bolt installation tool includes a first positioning member (1) and a second positioning member (2). Both the first positioning member (1) and the second positioning member (2) include an equal-diameter section (11) and a reduced-diameter section (12, 12') connected axially. The diameter of the equal-diameter section (11) matches the diameter of the positioning hole in the theoretical machining state, and the diameter of the reduced-diameter section (12, 12') tapers from the end connected to the equal-diameter section (11) towards the direction away from the equal-diameter section (11); the helicopter blade connecting bolt installation method includes a positioning hole alignment method, and the positioning hole alignment method includes the following steps: Insert the first positioning member (1) sequentially into the inside of the blade root connecting member (01), the blade sleeve (02), and the blade (03) from the first end of the positioning hole, and make the reduced-diameter section (12) of the first positioning member (1) pass through the second end of the positioning hole; Axially abut the reduced-diameter section (12') of the second positioning member (2) against the reduced-diameter section (12) of the first positioning member (1), and strike the second positioning member (2) until the first positioning member (1) is ejected, and the reduced-diameter section (12') of the second positioning member (2) passes through the first end of the positioning hole.

2. The helicopter blade connecting bolt installation method according to claim 1, characterized in that, when the second positioning member (2) is provided with a threaded section (14) axially connected to the reduced-diameter section (12'), the second positioning member serves as a connecting bolt; when the second positioning member (2) does not include a threaded section (14), the helicopter blade connecting bolt installation method further includes: Axially abut the connecting bolt against the reduced-diameter section (12') of the second positioning member (2), and strike the connecting bolt until one end of the connecting bolt passes through the second end of the positioning hole, and the other end of the connecting bolt abuts against the end face of the first end of the positioning hole.

3. The helicopter blade connecting bolt installation method according to claim 1, characterized in that, the helicopter blade connecting bolt installation tool further includes a head (13) axially connected to the equal-diameter section (11), and the diameter of the head (13) is greater than the diameter of the equal-diameter section (11).

4. The helicopter blade connecting bolt installation method according to claim 3, characterized in that, a first groove (1a) extending circumferentially is provided on the peripheral wall of the end of the equal-diameter section (11) connected to the head (13).

5. The helicopter blade connecting bolt installation method according to claim 1, characterized in that, a second groove (1b) extending circumferentially is provided on the peripheral wall of the reduced-diameter section (12).

6. The helicopter blade connecting bolt installation method according to any one of claims 1, 3 - 5, characterized in that, at least one of the first positioning member (1) and the second positioning member (2) is further provided with a threaded section (14) axially connected to the reduced-diameter section (12, 12'), and the diameter of the threaded section (14) is smaller than the diameter of the equal-diameter section (11).

7. The installation method of the helicopter blade connecting bolt according to claim 6, characterized in that, a third groove (1c) extending circumferentially is further provided at the connection between the threaded section (14) and the stepped sections (12, 12').

8. The installation method of the helicopter blade connecting bolt according to any one of claims 1, 3 - 5, characterized in that, the first positioning member (1) and the second positioning member (2) are made of bolts.

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