An eight strut main reducer mounting method and system

Abstract

The application discloses an eight-brace main reducer mounting method and system, and belongs to the technical field of helicopters. The mounting method comprises the following steps: determining the initial inclination angle, initial pitch angle and initial position of the main reducer of the helicopter; adjusting the distance between the bottom of the main reducer and the rack based on the initial position; after the distance is adjusted, preliminarily adjusting the main reducer based on the initial inclination angle and the initial pitch angle; secondarily adjusting the main reducer; and fixing the main reducer. The eight-brace main reducer mounting method has the advantages of good mounting repeatability, effectively shortened main reducer rack mounting time, avoided mounting repetition, reduced labor intensity of installers, improved work efficiency, solved the problem of difficult installation coordination between braces, simple mounting process, and the ability to quickly complete installation for new installers of such main reducers.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of helicopters, and particularly relates to an eight-strut main reducer mounting method and system. BACKGROUND

[0002] The connection mode of the main reducer of a helicopter and the body of the helicopter includes a case flange connection, a four-strut + torque disc connection and an eight-strut connection. The eight-strut structure form arranges eight struts in the middle of the main reducer case, and two of the eight struts are connected to form a support to support the main reducer. The eight struts are divided into four groups, and each group has two struts, which are located at four corners of the main reducer, as shown in detail in Figure 1 The eight-strut structure has good stability, strength and crash resistance, is suitable for main reducers of heavy, large, medium and small helicopters of various transmission types, has a simple and reasonable structure, high redundancy, safe and reliable force transmission, and low maintenance and use costs. Although there are many types of eight-strut main reducers, there is no effective solution in the existing public technical data for the installation of the eight-strut main reducer on a vehicle platform.

[0003] The traditional installation process of the existing eight-strut main reducer has the following problems:

[0004] 1) Since the eight-strut support structure is a statically overdetermined structure, in order to ensure the coordination of the installation of the struts, the length of the struts needs to be adjusted multiple times, which takes a long time and has high labor intensity;

[0005] 2) The length of the struts is limited, and it may occur that one of the struts is adjusted to the longest or shortest length but still cannot meet the installation requirements, which leads to the failure of the installation, the need to adjust the length of all the struts again, and time and labor waste;

[0006] 3) Since the struts have high degrees of freedom, the uncertainty of the positions of the struts leads to poor repeatability of the installation;

[0007] 4) For personnel who are new to the installation of such a main reducer, it is difficult to start due to the complex adjustment process.

[0008] Therefore, it is urgent to develop an installation method that is convenient, fast and has good repeatability. SUMMARY

[0009] In view of the above problems, the application discloses an eight-strut main reducer installation method, which comprises the following steps:

[0010] Determine the initial inclination angle, initial pitch angle and initial position of the main reducer of the helicopter;

[0011] Adjust the distance between the bottom of the main reducer and the rack based on the initial position;

[0012] After the distance adjustment, the main reducer is preliminarily adjusted based on the initial tilt angle and the initial pitch angle;

[0013] The main reducer is secondarily adjusted.

[0014] The main reducer is fixed.

[0015] Further, the determination of the initial tilt angle, the initial pitch angle and the initial position of the main reducer of the helicopter comprises the following steps:

[0016] The initial tilt angle and the initial pitch angle of the main reducer are measured by connecting the main reducer with the main reducer support rods.

[0017] The distance between the bottom of the main reducer and the rack is measured to determine the initial position of the main reducer.

[0018] Further, the adjustment of the distance between the bottom of the main reducer and the rack based on the initial position comprises the following steps:

[0019] The length of each main reducer support rod is adjusted in sequence to adjust the distance between the bottom of the main reducer and the rack to a set length range.

[0020] The length of each main reducer support rod is adjusted uniformly each time.

[0021] Further, the distance between the bottom of the main reducer and the rack is not less than 200 mm.

[0022] Further, after the distance adjustment, the main reducer is preliminarily adjusted based on the initial tilt angle and the initial pitch angle, which comprises the following steps:

[0023] The second support rod, the third support rod, the sixth support rod and the seventh support rod are disconnected from the main reducer to ensure that the main reducer is connected with the crane.

[0024] The length of the first support rod, the fourth support rod, the fifth support rod and the eighth support rod is adjusted according to the initial tilt angle and the initial pitch angle of the main reducer, and the tilt angle and the pitch angle of the main reducer are monitored in real time during the adjustment.

[0025] Further, the adjustment of the length of the first support rod, the fourth support rod, the fifth support rod and the eighth support rod according to the initial tilt angle and the initial pitch angle of the main reducer comprises the following steps:

[0026] If the front of the main reducer is high and the back is low, the length of the first support rod and the eighth support rod is simultaneously shortened or the length of the fourth support rod and the fifth support rod is simultaneously lengthened.

[0027] If the front of the main reducer is low and the back is high, the length of the first support rod and the eighth support rod is simultaneously lengthened or the length of the fourth support rod and the fifth support rod is simultaneously shortened.

[0028] If the main reducer is left high and right low, the length of the first and fourth support rods is simultaneously shortened or the length of the fifth and eighth support rods is simultaneously lengthened;

[0029] If the main reducer is left low and right high, the length of the first and fourth support rods is simultaneously lengthened or the length of the fifth and eighth support rods is simultaneously shortened.

[0030] Further, the secondary adjustment of the main reducer comprises the following steps:

[0031] The second, third, sixth and seventh support rods are connected with the main reducer, and the main reducer is disconnected with the crane;

[0032] According to the inclination angle and the pitch angle of the main reducer after the preliminary adjustment, the length of the second, third, sixth and seventh support rods is simultaneously lengthened or shortened, and the inclination angle and the pitch angle of the main reducer are monitored in real time during the adjustment process, until the second, third, sixth and seventh support rods are in a stressed state;

[0033] Then, according to the inclination angle and the pitch angle of the main reducer, the length of the first, fourth, fifth and eighth support rods is simultaneously adjusted, so that the main reducer meets the set installation requirements.

[0034] Further, the fixing of the main reducer comprises the following steps:

[0035] The locking nuts of each main reducer support rod are tightened to lock the main reducer support rod, thereby fixing the main reducer.

[0036] The application also discloses an eight-support-rod main reducer installation system, which comprises:

[0037] A determination unit is configured to determine an initial inclination angle, an initial pitch angle and an initial position of a main reducer of a helicopter;

[0038] A distance unit is configured to adjust a distance between a bottom of the main reducer and a rack based on the initial position;

[0039] A preliminary adjustment unit is configured to preliminarily adjust the main reducer based on the initial inclination angle and the initial pitch angle after the distance adjustment;

[0040] A secondary adjustment unit is configured to secondarily adjust the main reducer.

[0041] A fixing unit is configured to fix the main reducer.

[0042] Further, the determination unit is specifically configured to:

[0043] Connecting the main reducer with the main reducer support rod, measuring the initial inclination angle and the initial pitch angle of the main reducer;

[0044] Measuring the distance between the bottom of the main reducer and the rack to determine the initial position of the main reducer.

[0045] Compared with the prior art, the embodiment of the application has at least the following advantages: the eight-support-rod main reducer installation method has good installation repeatability; effectively shortens the main reducer rack installation time, avoids repeated installation, reduces the labor intensity of the installation personnel, improves the work efficiency, solves the problem of difficult installation coordination between support rods; the installation process is simple, and new personnel who contact such main reducer installation can quickly complete the installation.

[0046] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood through implementation of the present application. The purpose and other advantages of the present application can be achieved and obtained by the structure indicated in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0048] Figure 1 The eight-support-rod main reducer structure schematic diagram according to the embodiment of the present application is shown;

[0049] Figure 2 The structure schematic diagram of the support rod according to the embodiment of the present application is shown;

[0050] Figure 3 The eight-support-rod main reducer top view according to the embodiment of the present application is shown;

[0051] Figure 4 The eight-support-rod main reducer installation method flow chart according to the embodiment of the present application is shown;

[0052] Figure 5 The eight-support-rod main reducer installation schematic diagram according to the embodiment of the present application is shown.

[0053] Reference numerals: 1, main reducer rotor shaft; 2, main reducer casing; 3, main reducer support rod; 31, first support rod; 32, second support rod; 33, third support rod; 34, fourth support rod; 35, fifth support rod; 36, sixth support rod; 37, seventh support rod; 38, eighth support rod; 4, main reducer input shaft; 5, fork; 6, locking nut; 7, support rod body. DETAILED DESCRIPTION

[0054] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely explain the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0055] Figure 1 A structure schematic diagram of an eight-support-rod main reducer is shown according to an embodiment of the present application. As shown in the figure, Figure 1 the main reducer mainly comprises a reducer body, a main reducer rotor shaft 1, a main reducer casing 2, a main reducer support rod 3 and a main reducer input shaft 4, etc.

[0056] The reducer body is installed in the main reducer casing 2; the reducer body is connected with the main reducer rotor shaft 1 and the main reducer input shaft 4 respectively; and a plurality of main reducer support rods 3 are arranged on the outer wall of the main reducer casing 2 in sequence.

[0057] The eight support rods are connected with each other to form a support to support the main reducer, and are respectively located at the four corners of the main reducer. The length of the support rod is adjusted to ensure that the pitch angle, the tilt angle, the left-right position and the front-rear position of the main reducer meet the installation requirements of the main reducer.

[0058] Figure 2 A structure schematic diagram of a main reducer support rod is shown according to an embodiment of the present application. As shown in the figure, Figure 2 the main reducer support rod 3 mainly comprises a fork 5 at both ends, a locking nut 6 and a support rod body 7, wherein the fork 5 is designed with a light hole with a matching size at one end, and is connected with the main reducer and the vehicle platform using a pin shaft, and is threadedly connected with the support rod body 7 at the other end; the locking nut 6 is used for locking after adjustment, and eliminates the gap of the threaded connection; and the support rod body 7 is a solid steel rod with a fixed length, and is designed with threads with opposite directions at both ends, and when the support rod body 7 is rotated, the length L of the main reducer support rod 3 can be extended or shortened, so as to realize the adjustment of the position of the main reducer.

[0059] Figure 3 An overhead view of an eight-support-rod main reducer is shown according to an embodiment of the present application. As shown in the figure, Figure 3As shown, the outer wall of the main reducer is circumferentially provided with a first support rod 31, a second support rod 32, a third support rod 33, a fourth support rod 34, a fifth support rod 35, a sixth support rod 36, a seventh support rod 37 and an eighth support rod 38 (in clockwise direction).

[0060] Figure 4 A flow chart of the eight-support-rod main reducer installation method according to an embodiment of the present application is shown. As shown, Figure 4 The eight-support-rod main reducer installation method according to the present application includes the following steps:

[0061] Step S1: Determine the initial inclination angle, initial pitch angle and initial position of the main reducer of the helicopter.

[0062] After the main reducer is moved to the appropriate position using the crane, the main reducer is connected with all eight main reducer support rods 3, the initial inclination angle to the left and right and the initial pitch angle to the front and back of the main reducer are measured using the frame level, which is used for subsequent adjustment comparison; the distance between the bottom of the main reducer and the rack is measured using the tape measure to determine the initial position of the main reducer.

[0063] Step S2: Adjust the distance between the bottom of the main reducer and the rack based on the initial position.

[0064] The length of each of the eight main reducer support rods 3 is adjusted in sequence so that the distance between the bottom of the main reducer and the rack meets the requirements; during the adjustment, the length of each main reducer support rod 3 is adjusted uniformly each time.

[0065] In some embodiments, the distance between the bottom of the main reducer and the rack is not less than 200 mm. For example, the distance between the bottom of the main reducer and the rack is 260 mm.

[0066] Step S3: After the distance adjustment, the main reducer is preliminarily adjusted based on the initial inclination angle and the initial pitch angle.

[0067] The second support rod 32, the third support rod 33, the sixth support rod 36 and the seventh support rod 37 are disconnected from the main reducer, while ensuring that the main reducer is still connected to the crane;

[0068] The length of the first support rod 31, the fourth support rod 34, the fifth support rod 35 and the eighth support rod 38 is adjusted according to the initial pitch angle and the initial inclination angle of the main reducer measured by the frame level, and the data of the frame level, i.e. the inclination angle and the pitch angle of the main reducer, is monitored in real time during the adjustment process. After the preliminary adjustment is completed, the data of the frame level is recorded.

[0069] In some embodiments, the specific adjustment method for adjusting the length of the first support rod 31, the fourth support rod 34, the fifth support rod 35 and the eighth support rod 38 is as follows:

[0070] If the front of the main reducer is high and the back is low, the length of the first strut 31 and the eighth strut 38 is simultaneously shortened or the length of the fourth strut 34 and the fifth strut 35 is simultaneously lengthened;

[0071] If the front of the main reducer is low and the back is high, the length of the first strut 31 and the eighth strut 38 is simultaneously lengthened or the length of the fourth strut 34 and the fifth strut 35 is simultaneously shortened;

[0072] If the left of the main reducer is high and the right is low, the length of the first strut 31 and the fourth strut 34 is simultaneously shortened or the length of the fifth strut 35 and the eighth strut 38 is simultaneously lengthened;

[0073] If the left of the main reducer is low and the right is high, the length of the first strut 31 and the fourth strut 34 is simultaneously lengthened or the length of the fifth strut 35 and the eighth strut 38 is simultaneously shortened.

[0074] It should be noted that in the above embodiment, the side where the first strut 31 and the eighth strut 38 are installed on the main reducer is the front, the side where the fourth strut 34 and the fifth strut 35 are installed on the main reducer is the back, the side where the second strut 32 and the third strut 33 are installed on the main reducer is the left, and the side where the sixth strut 36 and the seventh strut 37 are installed on the main reducer is the right, which are exemplarily described.

[0075] Step S4: Secondary accurate adjustment of the main reducer.

[0076] The second strut 32, the third strut 33, the sixth strut 36 and the seventh strut 37 are connected with the main reducer, and the main reducer is disconnected with the crane;

[0077] According to the data of the frame level recorded after the preliminary adjustment in step S3, the length of the second strut 32, the third strut 33, the sixth strut 36 and the seventh strut 37 is simultaneously lengthened or shortened, and the data of the frame level (the inclination angle and the pitch angle of the main reducer) is monitored in real time during the adjustment, until the second strut 32, the third strut 33, the sixth strut 36 and the seventh strut 37 are all in the stressed state (each strut reaches the state that it cannot be twisted);

[0078] According to the data of the frame level (the inclination angle and the pitch angle of the main reducer when the second strut 32, the third strut 33, the sixth strut 36 and the seventh strut 37 are all in the stressed state), the length of the first strut 31, the fourth strut 34, the fifth strut 35 and the eighth strut 38 is simultaneously adjusted, so that the position of the main reducer meets the set installation requirements. For example, the set installation requirements are that the inclination angle and the pitch angle are both 0°.

[0079] Step S5: Fixing the main reducer.

[0080] Tighten the locking nut 6 of each main reducer support rod 3, lock the main reducer support rod 3, and then fix the main reducer.

[0081] The application discloses a method for installing a helicopter eight-support-rod main reducer. The application does not need to use special measuring instruments and special tooling, only uses common measuring and installing tools, shortens or lengthens the lengths of eight main reducer support rods 3, preliminarily adjusts and secondarily precisely adjusts the eight-support-rod main reducer, and quickly completes installation of the eight-support-rod main reducer on a test bench.

[0082] The eight-support-rod main reducer installation method has been used for bench installation of a certain heavy helicopter main reducer and a certain high-speed helicopter main reducer.

[0083] As shown in Figure 5 Based on the above eight-support-rod main reducer installation method, the embodiment provides an eight-support-rod main reducer installation system, which comprises:

[0084] A determining unit is configured to determine an initial inclination angle, an initial pitch angle and an initial position of the main reducer.

[0085] A distance adjusting unit is configured to adjust a distance between the bottom of the main reducer and the test bench based on the initial position.

[0086] A preliminarily adjusting unit is configured to preliminarily adjust the main reducer based on the initial inclination angle and the initial pitch angle after distance adjustment.

[0087] A secondary adjusting unit is configured to secondarily adjust the main reducer.

[0088] A fixing unit is configured to fix the main reducer.

[0089] In some embodiments, the determining unit is specifically configured to:

[0090] Connect the main reducer with the main reducer support rod 3, and measure the initial inclination angle and the initial pitch angle of the main reducer.

[0091] Measure the distance between the bottom of the main reducer and the test bench, and determine the initial position of the main reducer.

[0092] Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood that modifications can be made to the foregoing embodiments, or additional implementations can be implemented, without departing from the spirit and scope of the inventive subject matter. Accordingly, the present application is not limited to the implementations described herein, but is intended to cover all modifications and equivalents falling within the spirit and scope of the inventive subject matter.

Claims

1. A method of installing an eight strut main reducer, characterized by, The method comprises the following steps: determining the initial tilt angle, initial pitch angle and initial position of the main reducer of the helicopter; adjusting the distance between the bottom of the main reducer and the rack based on the initial position; after the distance adjustment, preliminarily adjusting the main reducer based on the initial tilt angle and the initial pitch angle; secondarily adjusting the main reducer; fixing the main reducer; after the distance adjustment, preliminarily adjusting the main reducer based on the initial tilt angle and the initial pitch angle comprises the following steps: disconnecting the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) from the main reducer, and ensuring that the main reducer is connected with the crane; adjusting the lengths of the first support rod (31), the fourth support rod (34), the fifth support rod (35) and the eighth support rod (38) according to the initial tilt angle and the initial pitch angle of the main reducer, and monitoring the tilt angle and the pitch angle of the main reducer in real time during the adjustment process; the step of adjusting the lengths of the first support rod (31), the fourth support rod (34), the fifth support rod (35) and the eighth support rod (38) according to the initial tilt angle and the initial pitch angle of the main reducer comprises the following steps: if the front of the main reducer is high and the rear is low, the lengths of the first support rod (31) and the eighth support rod (38) are simultaneously shortened or the lengths of the fourth support rod (34) and the fifth support rod (35) are simultaneously lengthened; if the front of the main reducer is low and the rear is high, the lengths of the first support rod (31) and the eighth support rod (38) are simultaneously lengthened or the lengths of the fourth support rod (34) and the fifth support rod (35) are simultaneously shortened; if the left of the main reducer is high and the right is low, the lengths of the first support rod (31) and the fourth support rod (34) are simultaneously shortened or the lengths of the fifth support rod (35) and the eighth support rod (38) are simultaneously lengthened; if the left of the main reducer is low and the right is high, the lengths of the first support rod (31) and the fourth support rod (34) are simultaneously lengthened or the lengths of the fifth support rod (35) and the eighth support rod (38) are simultaneously shortened; the step of secondarily adjusting the main reducer comprises the following steps: connecting the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) with the main reducer, and disconnecting the main reducer from the crane; simultaneously lengthening or shortening the lengths of the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) according to the tilt angle and the pitch angle of the main reducer after the preliminary adjustment, monitoring the tilt angle and the pitch angle of the main reducer in real time during the adjustment process, and stopping until the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) are all in the stressed state; then, simultaneously adjusting the lengths of the first support rod (31), the fourth support rod (34), the fifth support rod (35) and the eighth support rod (38) according to the tilt angle and the pitch angle of the main reducer, so that the main reducer meets the set installation requirements.

2. The eight-strut main reducer mounting method according to claim 1, characterized by, the step of determining the initial tilt angle, the initial pitch angle and the initial position of the main reducer of the helicopter comprises the following steps: connecting the main reducer with the main reducer support rod (3), and measuring the initial tilt angle and the initial pitch angle of the main reducer; Measuring the distance between the main reducer bottom and the rack to determine the initial position of the main reducer.

3. The eight-strut main reducer mounting method according to claim 1, characterized by, The distance adjustment between the main reducer bottom and the rack based on the initial position includes the following steps: Adjust the length of each main reducer support rod (3) in turn to adjust the distance between the main reducer bottom and the rack to a set length range. The length of each main reducer support rod (3) is adjusted uniformly each time.

4. The eight-strut main reducer mounting method according to claim 1 or 3, characterized by, The distance between the main reducer bottom and the rack is not less than 200 mm.

5. The eight-strut main reducer mounting method of claim 1, wherein The main reducer is fixed by the following steps: Tighten the locking nuts (6) of each main reducer support rod (3) to lock the main reducer support rod (3) and then fix the main reducer.

6. An eight strut main reducer mounting system characterized by, It includes: A determination unit is configured to determine an initial tilt angle, an initial pitch angle and an initial position of a main reducer of a helicopter; A distance unit is configured to adjust the distance between the main reducer bottom and the rack based on the initial position; A preliminary adjustment unit is configured to preliminarily adjust the main reducer based on the initial tilt angle and the initial pitch angle after the distance adjustment; A secondary adjustment unit is configured to secondarily adjust the main reducer; A fixing unit is configured to fix the main reducer; The preliminary adjustment of the main reducer based on the initial tilt angle and the initial pitch angle after the distance adjustment includes the following steps: Disconnect the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) from the main reducer to ensure that the main reducer is connected with the crane; Adjust the length of the first support rod (31), the fourth support rod (34), the fifth support rod (35) and the eighth support rod (38) according to the initial tilt angle and the initial pitch angle of the main reducer, and monitor the tilt angle and the pitch angle of the main reducer in real time during the adjustment process; The adjustment of the length of the first support rod (31), the fourth support rod (34), the fifth support rod (35) and the eighth support rod (38) according to the initial tilt angle and the initial pitch angle of the main reducer includes the following steps: If the main reducer is high in front and low in back, the length of the first support rod (31) and the eighth support rod (38) is shortened simultaneously or the length of the fourth support rod (34) and the fifth support rod (35) is lengthened simultaneously; If the main reducer is low in front and high in back, the length of the first support rod (31) and the eighth support rod (38) is lengthened simultaneously or the length of the fourth support rod (34) and the fifth support rod (35) is shortened simultaneously; If the main reducer is high on the left and low on the right, the length of the first support rod (31) and the fourth support rod (34) is shortened simultaneously or the length of the fifth support rod (35) and the eighth support rod (38) is lengthened simultaneously; If the main reducer is low on the left and high on the right, the length of the first support rod (31) and the fourth support rod (34) is lengthened simultaneously or the length of the fifth support rod (35) and the eighth support rod (38) is shortened simultaneously; The secondary adjustment of the main reducer includes the following steps: Connect the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) with the main reducer, and disconnect the main reducer from the crane at the same time; According to the inclination angle and the pitch angle of the main reducer after the preliminary adjustment, the length of the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) is simultaneously elongated or shortened, the inclination angle and the pitch angle of the main reducer are monitored in real time during the adjustment process, and the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) are in a stressed state until the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) are in a stressed state; Then, according to the inclination angle and the pitch angle of the main reducer, the length of the first support rod (31), the fourth support rod (34), the fifth support rod (35) and the eighth support rod (38) is adjusted, so that the main reducer reaches the set installation requirement.

7. The eight-strut main reducer mounting system of claim 6, wherein, The determination unit is specifically used for: The main reducer is connected with the main reducer support rod (3), and the initial inclination angle and the initial pitch angle of the main reducer are measured; The distance between the bottom of the main reducer and the rack is measured to determine the initial position of the main reducer.

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