Method and system for installing eight-supporting-rod main speed reducer

Abstract

The invention discloses an eight-supporting-rod main speed reducer installation method and system, and belongs to the technical field of helicopters.The installation method comprises the following steps that the initial inclination angle, the initial pitching angle and the initial position of a helicopter main speed reducer are determined; based on the initial position, the distance between the bottom of the main speed reducer and a rack is adjusted; after the distance is adjusted, the main speed reducer is preliminarily adjusted based on the initial inclination angle and the initial pitching angle; adjusting the main speed reducer for the second time; and the main speed reducer is fixed. The installation method of the eight-supporting-rod main speed reducer has the advantages that the installation repeatability is good; the installation time of the main speed reducer trolley is effectively shortened, repeated installation is avoided, the labor intensity of installation personnel is relieved, the working efficiency is improved, and the problem that installation coordination between supporting rods is difficult is solved. And the installation process is simple, and a person who newly contacts the installation of the main speed reducer can quickly complete the installation.

Description

Technical Field

[0001] The invention belongs to the technical field of helicopters, and in particular relates to an eight-strut main reducer installation method and system. Background Art

[0002] The connection methods of the helicopter main reducer and the helicopter body include: casing flange connection, four-strut + torque plate connection, eight-strut connection, etc. Among them, the eight-strut structure arranges 8 struts in the middle of the main reducer casing, two by two are connected to form a bracket to support the main reducer. The 8 struts are divided into 4 groups, 2 in each group, and are located at the four corners of the main reducer. For details, see Figure 1 As shown. The eight-strut structure has good stability, strength and crash resistance, and is suitable for heavy, large, medium and small helicopter main reducers of various transmission types. Its structure is simple and reasonable, with large redundancy, safe and reliable force transmission, and low maintenance and use costs. Although many types of helicopter main reducers use the eight-strut structure, there is no effective solution for the installation of the eight-strut main reducer on the platform in the existing public technical data.

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

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

[0005] 2) The adjustable length of the support rod is limited. It is possible that even if one support rod is adjusted to the longest or shortest length, it still cannot meet the installation requirements, resulting in the inability to continue the installation. All support rods need to be readjusted, which is time-consuming and laborious.

[0006] 3) Since the struts have many degrees of freedom, their position uncertainty is large, resulting in poor installation repeatability;

[0007] 4) For those who are new to installing this type of main reducer, it is difficult to get started because the adjustment process is more complicated.

[0008] Therefore, it is urgent to develop a convenient, fast and repeatable installation method. Summary of the invention

[0009] In view of the above problems, the present invention discloses an eight-strut main reducer installation method, comprising the following steps:

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

[0011] Based on the initial position, adjusting the distance between the bottom of the main reducer and the stand;

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

[0013] Secondary adjustment of the main reducer;

[0014] The final reducer is fixed.

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

[0016] Connect the main reducer to the main reducer support rod and measure the initial tilt angle and initial pitch angle of the main reducer;

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

[0018] Furthermore, adjusting the distance between the bottom of the main reducer and the stand based on the initial position includes the following steps:

[0019] Adjust the length of each main reducer support rod in turn, and adjust the distance between the bottom of the main reducer and the stand to the set length range;

[0020] Among them, the length of each main reducer support rod is consistent each time it is adjusted.

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

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

[0023] Disconnect the second support rod, the third support rod, the sixth support rod and the seventh support rod from the main reducer to ensure that the main reducer is connected to the crane;

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

[0025] Furthermore, adjusting the lengths 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 main reducer is higher at the front and lower at the back, the lengths of the first and eighth struts are shortened at the same time, or the lengths of the fourth and fifth struts are lengthened at the same time;

[0027] If the main reducer is lower in front and higher in the back, the lengths of the first and eighth struts are simultaneously extended or the lengths of the fourth and fifth struts are simultaneously shortened;

[0028] If the main reducer is higher on the left and lower on the right, the lengths of the first and fourth struts are shortened at the same time or the lengths of the fifth and eighth struts are lengthened at the same time;

[0029] If the main reducer is lower on the left and higher on the right, the lengths of the first and fourth struts are simultaneously extended or the lengths of the fifth and eighth struts are simultaneously shortened.

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

[0031] Connect the second support rod, the third support rod, the sixth support rod and the seventh support rod to the main reducer, and disconnect the main reducer from the crane;

[0032] According to the inclination angle and pitch angle of the main reducer after the preliminary adjustment, the lengths of the second support rod, the third support rod, the sixth support rod and the seventh support rod are extended or shortened at the same time, and the inclination angle and pitch angle of the main reducer are monitored in real time during the adjustment process until the second support rod, the third support rod, the sixth support rod and the seventh support rod are all in a stressed state;

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

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

[0035] Tighten the locking nut of each main reducer support rod to lock the main reducer support rod and fix the main reducer.

[0036] The present invention also discloses an eight-strut main reducer installation system, comprising:

[0037] A determination unit, used for determining an initial tilt angle, an initial pitch angle and an initial position of a main reducer of the helicopter;

[0038] A distance unit, used for adjusting the distance between the bottom of the main reducer and the stand based on the initial position;

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

[0040] A secondary adjustment unit, used for secondary adjustment of the main reducer;

[0041] The fixing unit is used for fixing the main reducer.

[0042] Furthermore, the determining unit is specifically configured to:

[0043] Connect the main reducer to the main reducer support rod and measure the initial tilt angle and initial pitch angle of the main reducer;

[0044] The distance between the bottom of the main reducer and the stand is measured to determine the initial position of the main reducer.

[0045] Compared with the prior art, the embodiments of the present invention have at least the following advantages: the eight-strut main reducer installation method of the present invention has good installation repeatability; it effectively shortens the installation time of the main reducer platform, avoids repeated installation, reduces the labor intensity of the installers, improves work efficiency, and solves the problem of difficult installation coordination between the struts; the installation process is simple, and personnel who are new to the installation of this type of main reducer can quickly get started and complete the installation.

[0046] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 A schematic structural diagram of an eight-strut main reducer according to an embodiment of the present invention is shown;

[0049] Figure 2 A schematic structural diagram of a support rod according to an embodiment of the present invention is shown;

[0050] Figure 3 A top view of an eight-strut main reducer according to an embodiment of the present invention is shown;

[0051] Figure 4 A flow chart of a method for installing an eight-strut main reducer according to an embodiment of the present invention is shown;

[0052] Figure 5 A schematic diagram of the installation of an eight-strut main reducer according to an embodiment of the present invention is shown.

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

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Figure 1 FIG. 2 shows a schematic diagram of the structure of an eight-strut main reducer according to an embodiment of the present invention. Figure 1 As shown, the main reducer mainly includes 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 to the main reducer rotor shaft 1 and the main reducer input shaft 4 respectively; a plurality of main reducer struts 3 are sequentially arranged circumferentially on the outer wall of the main reducer casing 2.

[0057] Eight struts are connected in pairs to form a bracket to support the main reducer, which are located at the four corners of the main reducer. The length of the struts is adjusted to ensure that the pitch angle, tilt angle, left and right position, and front and back position of the main reducer meet the installation requirements of the main reducer.

[0058] Figure 2 FIG. 2 shows a schematic diagram of the structure of the main reducer support rod according to an embodiment of the present invention. Figure 2 As shown, the main reducer support rod 3 is mainly composed of fork-shaped parts 5, locking nuts 6 and support rod bodies 7 at both ends, wherein a light hole with matching size is designed at one end of the fork-shaped part 5, which is connected to the main reducer and the platform by a pin shaft, and the other end is connected to the support rod body 7 by a thread; the locking nut 6 is used for locking after installation and adjustment, and eliminating the gap in the threaded connection; the support rod body 7 is a solid steel rod of fixed length, and threads with opposite rotation directions are designed at both ends. When the support rod body 7 is rotated, the length L of the main reducer support rod 3 can be extended or shortened to achieve the adjustment of the position of the main reducer.

[0059] Figure 3 FIG. 2 shows a top view of an eight-strut main reducer according to an embodiment of the present invention. Figure 3As shown, the outer wall of the main reducer is provided with a first strut 31, a second strut 32, a third strut 33, a fourth strut 34, a fifth strut 35, a sixth strut 36, a seventh strut 37 and an eighth strut 38 in sequence in the circumferential direction (clockwise direction).

[0060] Figure 4 FIG. 1 shows a flow chart of an eight-strut main reducer installation method according to an embodiment of the present invention. Figure 4 As shown, a method for installing an eight-strut main reducer proposed by the present invention comprises the following steps:

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

[0062] After using a crane to move the main reducer to a suitable position, connect the main reducer to all eight main reducer struts 3, and use a frame level to measure the left and right initial tilt angles and the front and rear initial pitch angles of the main reducer for subsequent adjustment and comparison; use a tape measure to measure the distance between the bottom of the main reducer and the test bench to determine the initial position of the main reducer.

[0063] Step S2: Based on the initial position, adjust the distance between the bottom of the main reducer and the stand.

[0064] The lengths of the eight main reducer support rods 3 are adjusted in sequence to ensure that the distance between the bottom of the main reducer and the stand meets the requirements; during the adjustment process, it is necessary to ensure that the length of each main reducer support rod 3 is consistent each time it is adjusted.

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

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

[0067] 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, while ensuring that the main reducer is still connected to the crane;

[0068] According to the initial pitch angle and initial tilt angle of the main reducer measured by the frame level ruler, the lengths of the first support rod 31, the fourth support rod 34, the fifth support rod 35 and the eighth support rod 38 are adjusted. During the adjustment process, the data of the frame level ruler, i.e., the tilt angle and pitch angle of the main reducer, need to be monitored in real time. After the preliminary adjustment is completed, the data of the frame level ruler is recorded.

[0069] In some embodiments, the specific method for 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 is as follows:

[0070] If the main reducer is higher at the front and lower at the back, the lengths of the first support rod 31 and the eighth support rod 38 are shortened at the same time, or the lengths of the fourth support rod 34 and the fifth support rod 35 are lengthened at the same time;

[0071] If the main reducer is lower in front and higher in the back, the lengths of the first support rod 31 and the eighth support rod 38 are simultaneously extended or the lengths of the fourth support rod 34 and the fifth support rod 35 are simultaneously shortened;

[0072] If the main reducer is higher on the left and lower on the right, the lengths of the first support rod 31 and the fourth support rod 34 are shortened at the same time, or the lengths of the fifth support rod 35 and the eighth support rod 38 are lengthened at the same time;

[0073] If the main reducer is lower on the left and higher on the right, the lengths of the first strut 31 and the fourth strut 34 are simultaneously extended or the lengths of the fifth strut 35 and the eighth strut 38 are simultaneously shortened.

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

[0075] Step S4: performing secondary precise adjustment of the main reducer.

[0076] Connect the second support rod 32, the third support rod 33, the sixth support rod 36 and the seventh support rod 37 to the main reducer, and disconnect the main reducer from the crane;

[0077] According to the frame level ruler data recorded after the preliminary adjustment in step S3, the lengths of the second support rod 32, the third support rod 33, the sixth support rod 36 and the seventh support rod 37 are extended or shortened at the same time, and the frame level ruler data (the inclination angle and the pitch angle of the main reducer) are monitored in real time during the adjustment process 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 a stressed state (each support rod reaches a state where it cannot be twisted);

[0078] Then, according to the data of the frame level ruler (the inclination angle and pitch angle of the main reducer when the second support rod 32, the third support rod 33, the sixth support rod 36 and the seventh support rod 37 are all in a stressed state), the lengths of the first support rod 31, the fourth support rod 34, the fifth support rod 35 and the eighth support rod 38 are adjusted at the same time 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: Fix the main reducer.

[0080] Tighten the locking nut 6 of each main reducer support rod 3 to lock the main reducer support rod 3, thereby fixing the main reducer.

[0081] The present invention discloses a method for installing an eight-strut main reducer for a helicopter. The method can be used for installing an eight-strut main reducer for a helicopter. The method can significantly improve the installation efficiency while ensuring the installation quality. The present invention does not need to use special measuring instruments and special tooling, but only uses universal measuring and installation tools. By shortening or lengthening the length of the eight main reducer struts 3, the eight-strut main reducer is preliminarily adjusted and secondarily precisely adjusted, and the installation of the eight-strut main reducer on a platform is quickly completed. The method is used to install the eight-strut main reducer, and the main reducer installation repeatability is good. The method is particularly suitable for the platform installation of a newly developed eight-strut main reducer that needs to be frequently mounted or dismounted, or that adopts new technology and new configuration.

[0082] The eight-strut main reducer installation method of the present invention has been used for the bench installation of a heavy helicopter main reducer and a high-speed helicopter main reducer. The installation results of the above two types of main reducers show that the installation method is reasonable and feasible. Under the premise of ensuring the repeatability of the main reducer installation, the installation work intensity of the technicians is greatly reduced compared with the previous one. At the same time, the main reducer bench installation period is also shortened from 5 days to 2-3 days.

[0083] like Figure 5 As shown, based on the above-mentioned eight-strut main reducer installation method, this embodiment proposes an eight-strut main reducer installation system, including:

[0084] A determination unit, used for determining an initial tilt angle, an initial pitch angle and an initial position of a main reducer of the helicopter;

[0085] A distance unit, used for adjusting the distance between the bottom of the main reducer and the stand based on the initial position;

[0086] A preliminary adjustment unit, configured to preliminarily adjust the main reducer based on the initial tilt angle and the initial pitch angle after the distance adjustment;

[0087] A secondary adjustment unit, used for secondary adjustment of the main reducer;

[0088] The fixing unit is used for fixing the main reducer.

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

[0090] Connect the main reducer to the main reducer support rod 3, and measure the initial tilt angle and initial pitch angle of the main reducer;

[0091] The distance between the bottom of the main reducer and the stand is measured to determine the initial position of the main reducer.

[0092] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for installing an eight-strut main reducer, characterized in that: The following steps are involved: Determine the initial tilt angle, initial pitch angle and initial position of the helicopter main reducer; Based on the initial position, adjusting the distance between the bottom of the main reducer and the stand; After the distance is adjusted, preliminarily adjusting the main reducer based on the initial tilt angle and the initial pitch angle; Secondary adjustment of the main reducer; The final reducer is fixed.

2. The eight-strut main reducer installation method according to claim 1, characterized in that: Determining the initial tilt angle, initial pitch angle and initial position of the helicopter main reducer comprises the following steps: Connecting the main reducer to the main reducer support rod (3), and measuring the initial tilt angle and initial pitch angle of the main reducer; The distance between the bottom of the main reducer and the stand is measured to determine the initial position of the main reducer.

3. The eight-strut main reducer installation method according to claim 1, characterized in that: The adjusting the distance between the bottom of the main reducer and the stand based on the initial position comprises the following steps: The length of each main reducer support rod (3) is adjusted in sequence, and the distance between the bottom of the main reducer and the stand is adjusted to a set length range; The length of each main reducer support rod (3) is consistent each time it is adjusted.

4. The eight-strut main reducer installation method according to claim 1 or 3, characterized in that: The distance between the bottom of the main reducer and the stand is not less than 200 mm.

5. The eight-strut main reducer installation method according to claim 1, characterized in that: After the distance is adjusted, based on the initial tilt angle and the initial pitch angle, preliminarily adjusting the main reducer comprises 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 in a connected state with the crane; The lengths of the first support rod (31), the fourth support rod (34), the fifth support rod (35) and the eighth support rod (38) are 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 process.

6. The eight-strut main reducer installation method according to claim 5, characterized in that: 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 main reducer is higher at the front and lower at the back, the lengths of the first support rod (31) and the eighth support rod (38) are shortened at the same time, or the lengths of the fourth support rod (34) and the fifth support rod (35) are lengthened at the same time; If the main reducer is lower in front and higher in the back, the lengths of the first support rod (31) and the eighth support rod (38) are simultaneously extended or the lengths of the fourth support rod (34) and the fifth support rod (35) are simultaneously shortened; If the main reducer is higher on the left and lower on the right, the lengths of the first support rod (31) and the fourth support rod (34) are shortened at the same time, or the lengths of the fifth support rod (35) and the eighth support rod (38) are lengthened at the same time; If the main reducer is lower on the left and higher on the right, the lengths of the first support rod (31) and the fourth support rod (34) are simultaneously extended or the lengths of the fifth support rod (35) and the eighth support rod (38) are simultaneously shortened.

7. The eight-strut main reducer installation method according to claim 1, characterized in that: The secondary adjustment of 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) to the main reducer, and disconnecting the main reducer from the crane; According to the inclination angle and pitch angle of the main reducer after preliminary adjustment, the lengths of the second support rod (32), the third support rod (33), the sixth support rod (36) and the seventh support rod (37) are simultaneously extended or shortened, and the inclination angle and pitch angle of the main reducer are monitored in real time during the adjustment process 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 a stressed state; Then, according to the inclination angle and pitch angle of the main reducer, the lengths of the first support rod (31), the fourth support rod (34), the fifth support rod (35) and the eighth support rod (38) are adjusted simultaneously so that the main reducer meets the set installation requirements.

8. The eight-strut main reducer installation method according to claim 1, characterized in that: The fixing of the main reducer comprises the following steps: Tighten the locking nut (6) of each main reducer support rod (3) to lock the main reducer support rod (3) and thereby fix the main reducer.

9. An eight-strut main reducer mounting system, characterized in that: include: A determination unit, used for determining an initial tilt angle, an initial pitch angle and an initial position of a main reducer of the helicopter; A distance unit, used for adjusting the distance between the bottom of the main reducer and the stand based on the initial position; A preliminary adjustment unit, 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, used for secondary adjustment of the main reducer; The fixing unit is used for fixing the main reducer.

10. The eight-strut main reducer mounting system according to claim 9, characterized in that: The determining unit is specifically configured to: Connecting the main reducer to the main reducer support rod (3), and measuring the initial tilt angle and initial pitch angle of the main reducer; The distance between the bottom of the main reducer and the stand is measured to determine the initial position of the main reducer.

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