Ruler for measuring extension amount of connecting rod of helicopter tail speed reducer

Abstract

The utility model relates to a length measuring tool. The utility model relates to a helicopter tail speed reducer connecting rod extension measuring scale, which mainly comprises a reference sheet, a large sleeve, a sliding rod with scales, a small sleeve with internal threads, an upper support arm with external threads and a foldable lower support arm, and is characterized in that the reference sheet is fixed at one end of the large sleeve; the sliding rod with the scales slides and is nested in the large sleeve, and the front end of the sliding rod with the scales is connected with the small sleeve with the internal thread; the upper support arm with the external thread and the small sleeve with the internal thread are connected through threads and are locked through the locking nut; and the upper support arm with the external thread is hinged with the foldable lower support arm. The measuring scale adopts a telescopic folding design, and through the design of the telescopic scale cylinder and the folding arms, the extension amount of the helicopter tail speed reducer connecting rod can be measured under the condition that only a screw cap on the outer side of a tail rotor hub is disassembled and assembled, and a tail rotor blade, the tail rotor hub and a collector ring are not disassembled and assembled, so that the workload is greatly reduced. The device is reasonable in design, simple in structure and high in practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of measuring tool, in particular to a kind of helicopter tail speed reducer connecting rod extension measurement ruler. BACKGROUND

[0002] Helicopter tail speed reducer connecting rod of Mi-17 series is mainly used to change the size of helicopter tail rotor blade installation angle by lengthening or shortening, to change tail rotor tension, realize helicopter heading control. According to the type of helicopter maintenance manual, after completing the work of disconnecting tail rotor control cable, the extension of tail speed reducer connecting rod should be measured to ensure that the extension of connecting rod meets the specified requirements when footrest is in neutral, left limit and right limit. Since the type of helicopter tail speed reducer connecting rod is located in the center of tail speed reducer output shaft, it is wrapped by tail rotor hub (connected with tail rotor blade), current collector ring and other components. When measuring the extension of tail speed reducer connecting rod in the field, tail rotor blade, tail rotor hub and tail rotor current collector ring need to be removed first to expose the tail speed reducer connecting rod, and then use a ruler to measure. After measurement, the components need to be installed in reverse order. It is not only time-consuming and labor-intensive, but also complex in process. In the process of disassembling and assembling tail rotor hub, connecting rod is easily damaged. Moreover, if the connecting rod end connecting nut is not installed in place, it will also cause tail rotor control failure, which endangers flight safety.

[0003] Currently, there is no convenient and fast measuring tool for measuring the extension of helicopter tail speed reducer connecting rod of this type, which brings great inconvenience to the maintenance and support of this type of helicopter.

[0004] Therefore, in order to facilitate the measurement of the extension of tail speed reducer connecting rod of this type of helicopter, improve work efficiency, and avoid damage to connecting rod caused by disassembly and assembly and reduce human error, it is necessary to propose a convenient and fast measuring ruler. UTILITY MODEL CONTENTS

[0005] The utility model proposes a kind of measuring ruler for conveniently and quickly measuring the extension of Mi-17 series helicopter tail speed reducer connecting rod in view of the prior art deficiency.

[0006] The utility model adopts the technical scheme of:

[0007] The utility model provides a kind of helicopter tail speed reducer connecting rod extension measurement ruler, which mainly comprises a reference sheet (1), a large sleeve (3), a scale sliding rod (4), a small sleeve (6) with internal threads, an upper arm (8) with external threads and a foldable lower arm (10). The reference sheet (1) is fixed at one end of the large sleeve (3) by a fixing nut (2). The scale sliding rod (4) is nested in the large sleeve (3) and slides. The front end of the scale sliding rod (4) is connected to the small sleeve (6) with internal threads. The upper arm (8) with external threads is connected to the small sleeve (6) with internal threads by threads and locked by a locking nut (7). The upper arm (8) with external threads is hinged to the foldable lower arm (10).

[0008] The utility model provides a kind of helicopter tail speed reducer connecting rod extension measurement ruler, which mainly comprises a reference sheet (1), a large sleeve (3), a scale sliding rod (4), a small sleeve (6) with internal threads, an upper arm (8) with external threads and a foldable lower arm (10). The reference sheet (1) is fixed at one end of the large sleeve (3) by a fixing nut (2). The front end of the scale sliding rod (4) is connected to the small sleeve (6) with internal threads by a right-angle nut or a spherical joint (5). The two are at a 90-degree angle.

[0009] The utility model provides a kind of helicopter tail speed reducer connecting rod extension measurement ruler, which mainly comprises a reference sheet (1), a large sleeve (3), a scale sliding rod (4), a small sleeve (6) with internal threads, an upper arm (8) with external threads and a foldable lower arm (10). The reference sheet (1) is fixed at one end of the large sleeve (3) by a fixing nut (2). The front end of the scale sliding rod (4) is connected to the small sleeve (6) with internal threads by a right-angle nut or a spherical joint (5). The two are at a 90-degree angle.

[0010] The utility model provides a kind of helicopter tail speed reducer connecting rod extension measurement ruler, which mainly comprises a reference sheet (1), a large sleeve (3), a scale sliding rod (4), a small sleeve (6) with internal threads, an upper arm (8) with external threads and a foldable lower arm (10). The reference sheet (1) is fixed at one end of the large sleeve (3) by a fixing nut (2). The front end of the scale sliding rod (4) is connected to the small sleeve (6) with internal threads by a right-angle nut or a spherical joint (5). The two are at a 90-degree angle.

[0011] The utility model provides a kind of helicopter tail speed reducer connecting rod extension measurement ruler, which mainly comprises a reference sheet (1), a large sleeve (3), a scale sliding rod (4), a small sleeve (6) with internal threads, an upper arm (8) with external threads and a foldable lower arm (10). The reference sheet (1) is fixed at one end of the large sleeve (3) by a fixing nut (2). The front end of the scale sliding rod (4) is connected to the small sleeve (6) with internal threads by a right-angle nut or a spherical joint (5). The two are at a 90-degree angle.

[0012] The utility model has the beneficial effects that:

[0013] 1. The utility model discloses a helicopter tail speed reducer connecting rod extension measurement ruler, which has reasonable design, simple structure and strong practicability. The measurement ruler adopts telescopic folding design, and through telescopic ruler barrel and folding arm design, the measurement of the tail speed reducer connecting rod extension can be completed by only disassembling the tail rotor hub outer side screw cap without disassembling the tail rotor blade, tail rotor hub and current collector ring, thereby improving work efficiency.

[0014] 2. The utility model discloses a helicopter tail speed reducer connecting rod extension measurement ruler, which has simple structure, convenient disassembly and assembly of components, is convenient to carry, and has intuitive and accurate reading. The utility model can effectively avoid the drawbacks of traditional measurement methods, i.e., the connecting rod is easily damaged by collision during disassembly and assembly of the tail rotor hub, and can prevent the tail rotor control failure caused by improper installation of the tail speed reducer connecting rod end connecting nut, thereby ensuring flight safety. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model discloses a helicopter tail speed reducer connecting rod extension measurement ruler structure schematic diagram shows,

[0016] Reference piece, 2. Fixed nut, 3. Big sleeve, 4. Scale sliding rod, 5. Spherical joint, 6. Small sleeve with internal thread, 7. Lock nut, 8. Upper arm with external thread, 9. Rotation shaft, 10. Foldable lower arm, 11. Measurement end foot,

[0017] Figure 2 The utility model discloses a helicopter tail speed reducer connecting rod extension measurement ruler working principle / usage state schematic diagram shows,

[0018] Reference piece, 2. Fixed nut, 3. Big sleeve, 4. Scale sliding rod, 5. Spherical joint, 6. Small sleeve with internal thread, 7. Lock nut, 8. Upper arm with external thread, 9. Rotation shaft, 10. Foldable lower arm, 11. Measurement end foot, DETAILED DESCRIPTION

[0019] In order to make the technical concept and the advantage of the application more clear and obvious, the technical scheme of the utility model is further described in detail below with reference to the drawings. It should be understood that the following examples are only used to explain and illustrate the preferred embodiment of the utility model, and should not be regarded as limiting the scope of the utility model. EMBODIMENT

[0020] Reference Figure 1 The utility model discloses a helicopter tail speed reducer connecting rod extension measurement ruler mainly by reference piece 1, big sleeve 3, scale sliding rod 4, small sleeve 6 with internal thread, upper arm 8 with external thread and foldable lower arm 10 are formed, reference piece 1 is fixed in big sleeve 3 one end through fixed nut 2;Scale sliding rod 4 is nested in big sleeve 3 and is slid, and the front end of scale sliding rod 4 is connected with small sleeve 6 with internal thread;Upper arm 8 with external thread and small sleeve 6 with internal thread are connected through thread and are locked through lock nut 7;Upper arm 8 with external thread and foldable lower arm 10 are hinged. EMBODIMENT

[0021] Reference Figure 1 The helicopter tail speed reducer connecting rod extension measurement ruler of the embodiment is different from the embodiment 1 in that the front end of scale sliding rod 4 is fixedly connected with small sleeve 6 with internal thread through spherical joint 5 (also can use right-angle nut);Compared with ordinary hinged connection mode, the both always present 90 degrees angle, and the angle does not need to be adjusted when measuring.

[0022] The upper support arm 8 with external threads and the foldable lower support arm 10 are hinged by a rotating shaft 9. When the foldable lower support arm 10 is folded inward, it forms a 90-degree angle with the upper support arm 8 with external threads (a thread and locking nut can be provided at one end of the rotating shaft for fastening / or a damping structure can be used for limiting the angle for easy adjustment). At this time, the foldable lower support arm 10 and the graduated sliding rod 4 are parallel to ensure measurement accuracy. Example

[0023] like Figure 1 As shown, the measuring scale for the extension of the helicopter tail gear reducer linkage in this embodiment differs from that in Embodiments 1 or 2 in that a measuring foot 11 is provided at the lower end of the foldable lower support arm 10. When wear occurs, the measuring foot can be replaced to reduce measurement errors.

[0024] The present invention relates to a measuring scale for the extension of the connecting rod of a helicopter tail gear reducer. A limiting nut is provided at the front end of the large sleeve 3 in conjunction with the graduated sliding rod 4 to prevent the graduated sliding rod 4 from coming off.

[0025] Figure 2 The image shows the usage status and working principle of the measuring scale for the extension of the connecting rod of the helicopter tail gear reducer according to this utility model:

[0026] During measurement, remove the outer screw cap 27 of the tail rotor hub, loosen the locking nut 7 of the connecting rod measuring scale, tighten the upper support arm 8 with external threads to the appropriate length, fold the foldable lower support arm 10 inward by 90°, pull out the graduated sliding rod 4, press the reference plate 1 against the outer end face of the tail gear reducer coupling plate 21, and move the measuring end foot 11 towards the tail rotor hub and press against the outer end face of the tail gear reducer connecting rod 24. The value read from the graduated sliding rod 4 at this time is the extension amount of the tail gear reducer connecting rod 24.

[0027] This utility model measuring ruler adopts a telescopic and folding design. Through the telescopic ruler tube and folding arm design, it is possible to measure the extension of the tail rotor coupling rod by only removing and installing the outer screw cover of the tail rotor hub, without removing and installing the tail rotor blades, tail rotor hub, and collector ring. This greatly reduces the workload, saves many steps of traditional measurement methods, improves work efficiency, and can also effectively eliminate the safety hazards that may be caused by traditional measurement methods.

[0028] Of course, the above description is only a preferred embodiment of this utility model and does not constitute a limitation on this utility model. Those skilled in the art, under the guidance of existing technology, can make other modifications to the implementation of this utility model without creative effort. Any modifications made within the spirit and principles of this utility model, or any simple substitutions or equivalent replacements made using conventional technical means in the field, should be included within the protection scope of this utility model.

Claims

1. A measuring scale for measuring the extension of a helicopter tail gear reducer linkage, characterized in that: The measuring ruler is mainly composed of a reference plate (1), a large sleeve (3), a graduated sliding rod (4), a small sleeve (6) with internal threads, an upper support arm (8) with external threads, and a foldable lower support arm (10). The reference plate (1) is fixed at one end of the large sleeve (3). The graduated sliding rod (4) slides and is nested inside the large sleeve (3). The front end of the graduated sliding rod (4) is connected to the small sleeve (6) with internal threads. The upper support arm (8) with external threads and the small sleeve (6) with internal threads are connected by threads and locked by a lock nut (7). The upper support arm (8) with external threads and the foldable lower support arm (10) are hinged.

2. The measuring scale for measuring the extension of the helicopter tail gear reducer linkage according to claim 1, characterized in that: The front end of the graduated sliding rod (4) and the small sleeve (6) with internal threads are connected by a right-angle nut or a ball joint (5); the two are at a 90-degree angle.

3. The measuring scale for the extension of the helicopter tail gear reducer linkage according to claim 1 or 2, characterized in that: The upper support arm (8) with external threads and the foldable lower support arm (10) are hinged by a rotating shaft (9). When the foldable lower support arm (10) is folded inward, it forms a 90-degree angle with the upper support arm (8) with external threads.

4. The measuring scale for the extension of the helicopter tail gear reducer linkage according to claim 3, characterized in that: A measuring foot (11) is provided at the lower end of the foldable lower arm (10).

5. The helicopter tail gear reducer linkage extension measuring scale according to claim 1, 2 or 4, characterized in that: The front end of the large sleeve (3) is fitted with a limit nut that is used to prevent the scaled sliding rod (4) from coming out.

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