阅读说明：本技术 一种v2500发动机反推c涵道滑轨结构的更换方法 (Method for replacing reverse thrust C duct sliding rail structure of V2500 engine ) 是由 王荣巍 蔡长海 伍星 胡运强 周春来 马鹏飞 于 2020-05-11 设计创作，主要内容包括：本发明公开了一种V2500发动机反推C涵道滑轨结构的更换方法,包括以下步骤：(S1)通过逆向工程获取V2500发动机反推C涵道的全套数模,得到反推C涵道的结构尺寸；(S2)根据反推C涵道的结构尺寸,制作型架；(S3)对型架进行实际验证；(S4)制作关节臂,关节臂设于型架下方,在关节臂的下方还设有型架定位导轨；(S5)通过型架、关节臂和型架定位导轨定位旧反推C涵道滑轨结构的位置,然后拆除旧滑轨结构,原位安装新滑轨结构,最后去除型架、关节臂和型架定位导轨,实现V2500发动机反推C涵道滑轨结构的更换。该方法通过设计型架、可调节关节臂和型架定位导轨,可实现V2500发动机反推C涵道滑轨的精准更换。(The invention discloses a method for replacing a reverse thrust C duct sliding rail structure of a V2500 engine, which comprises the following steps of: (S1) acquiring a complete set of digital analogy of the reverse-thrust C duct of the V2500 engine through reverse engineering to obtain the structural size of the reverse-thrust C duct; (S2) manufacturing a frame according to the structural size of the reverse C duct; (S3) performing actual verification on the jig; (S4) manufacturing a joint arm, wherein the joint arm is arranged below the fixture, and the fixture positioning guide rail is also arranged below the joint arm; (S5) positioning the position of the old reverse C duct sliding rail structure through the section frame, the joint arm and the section frame positioning guide rail, then dismantling the old sliding rail structure, installing a new sliding rail structure in situ, and finally removing the section frame, the joint arm and the section frame positioning guide rail to realize the replacement of the reverse C duct sliding rail structure of the V2500 engine. According to the method, the accurate replacement of the reverse thrust C duct sliding rail of the V2500 engine can be realized by designing the fixture, the adjustable joint arm and the fixture positioning guide rail.)

1. A method for replacing a reverse thrust C duct sliding rail structure of a V2500 engine is characterized by comprising the following steps of:

(S1) acquiring a complete set of digital analogy of the reverse-thrust C duct of the V2500 engine through reverse engineering to obtain the structural size of the reverse-thrust C duct;

(S2) manufacturing a fixture (1) according to the structural size of the reverse C duct;

(S3) performing actual verification of the jig (1);

(S4) manufacturing a joint arm (2), wherein the joint arm (2) is arranged below the fixture (1), and a fixture positioning guide rail (3) is also arranged below the joint arm (2);

(S5) the position of the old reverse-thrust C duct sliding rail structure is located through the section frame (1), the joint arm (2) and the section frame locating guide rail (3), then the old reverse-thrust C duct sliding rail structure is dismantled, a new reverse-thrust C duct sliding rail structure is installed in situ, and finally the section frame (1), the joint arm (2) and the section frame locating guide rail (3) are removed, so that the replacement of the reverse-thrust C duct sliding rail structure of the V2500 engine is realized.

2. The method for replacing the reverse thrust C duct sliding rail structure of the V2500 engine, which is characterized in that: in the step (S4), the articulated arm (2) comprises a first connecting seat (21) and a second connecting seat (22) which are hinged to each other, the first connecting seat (21) is arranged on a fixture positioning guide rail (3), a guide groove (11) is formed in a fixture (1), the second connecting seat (22) is arranged in the guide groove (11) of the fixture (1) in a sliding mode, and a graduated scale is arranged on the guide groove (11).

3. The method for replacing the reverse thrust C duct sliding rail structure of the V2500 engine, which is characterized in that: the articulated arm (2) further comprises a spindle (23), the first connecting seat (21) and the second connecting seat (22) being articulated to each other by means of the spindle (23).

4. The method for replacing the reverse thrust C duct sliding rail structure of the V2500 engine, which is characterized in that: first connecting seat (21) include first connecting body (211) and sleeve (212), first connecting body (211) with type frame location guide rail (3) fixed connection, second connecting seat (22) include second connecting body (221) and slider (222), wherein be equipped with through-hole (223) on second connecting body (221), the one end of mandrel (23) is run through-hole (223) with sleeve (212) and lock through first retaining member (213), slider (222) set up in guide way (11) and through second retaining member (224) locking.

5. The method for replacing the reverse thrust C duct sliding rail structure of the V2500 engine, which is characterized in that: a spacer (225) is arranged between the second locking member (224) and the guide groove (11).

6. The method for replacing the reverse thrust C duct sliding rail structure of the V2500 engine, which is characterized in that: the axial direction of the mandrel (23) is perpendicular to the sliding direction of the sliding block (222) in the guide groove (11).

7. The method for replacing the reverse thrust C duct slide rail structure of the V2500 engine according to any one of claims 2-6, wherein the method comprises the following steps: the first locking piece (213) is a butterfly nut, and the second locking piece (224) is an inner hexagonal settlement screw.

8. The method for replacing the reverse thrust C duct slide rail structure of the V2500 engine, which is characterized in that: the first connecting body (211) is fixedly connected with the jig positioning guide rail (3) through a screw (214).

9. The method for replacing the reverse thrust C duct slide rail structure of the V2500 engine by using the positioning fixture as claimed in claim 8, wherein the method comprises the following steps: in the step (S5), the positions of the back-thrust C duct slide rail structures before and after replacement are accurately positioned through the graduated scale on the guide groove (11).

10. The method for replacing the reverse thrust C duct sliding rail structure of the V2500 engine, which is characterized in that: in the step (S2), the fixture (1) can ensure that the new reverse-thrust C duct slide rail structure and the old reverse-thrust C duct slide rail structure are absolutely parallel in a three-dimensional space, the distance and the relative angle are fixed, and the fixture has good rigidity and does not deform or become unstable.

Technical Field

The invention belongs to the technical field of aircraft maintenance, and particularly relates to a method for replacing a reverse thrust C duct slide rail structure of a V2500 engine.

Background

Each flight cycle is reverse-estimated to be actuated once, and each active airplane needs to execute 4 flight cycles and actuate 4 times on average each day. During landing and running of the aircraft, the thrust reverser structure is subjected to about 70% of the thrust of the aircraft engine and changes the thrust to the opposite direction, thereby rapidly reducing the aircraft speed. In the whole actuating process, the reverse thrust structure is subjected to complex high-temperature, high-vibration and high-stress effects. With the increase of service time, the structure damage of the reverse thrust structure is easy to occur, wherein the wear of the slide rail of the reverse thrust C duct is the most common.

After the slide rail is abraded, the vibration is aggravated when the reverse thrust is actuated under the slight condition, the efficiency is reduced, the blocking of an actuating mechanism is caused under the severe condition, the landing and sliding attitude of an airplane is influenced, the failure of the whole actuating system can be caused by the further development, the non-inclusiveness of structural components is lost, and the inestimable influence is brought to the flight safety.

The C duct slide rail structure is so critical, and the aviation operator reason should strengthen slide rail structure inspection and maintenance, but at the actual motion in-process, because slide rail structure inspection is close the difficulty, the damage is hidden, and in the early stage that the damage takes place, hardly by in time inspection discovery. After the damage is further expanded, when the damage is detected and found for the first time, the original state and function of the damage cannot be restored through simple maintenance, and complex structure repair is required to be carried out on the damage, and even the airworthiness requirement can be met. The cost for replacing the damaged slide rail is high, the size of the replaced slide rail can be ensured to be accurate by means of a special positioning tool fixture, interference, abrasion and even blocking do not occur in the operation process of the slide rail, the operation is smooth, and secondary damage is not caused to the structure.

Because the OEM (manufacturer for designing and manufacturing the aircraft engine nacelle) technology is blocked, all engine nacelle tooling frames such as a reverse thrust C duct and the like are not sold, when the slide rail is greatly damaged, the slide rail must be sent back to the original factory for repair or replacement (the price is very high due to almost monopolizing the market), the repair and replacement proportion and cost of the slide rail repair and replacement are analyzed by inquiring the repair and delivery record of the reverse thrust C duct of a company in recent years, and high repair and delivery cost is caused for the company.

Disclosure of Invention

The invention aims to provide a method for replacing a V2500 engine reverse thrust C duct sliding rail structure, which can realize the accurate replacement of the V2500 engine reverse thrust C duct sliding rail structure by designing a fixture and additionally arranging an adjustable articulated arm and a fixture positioning guide rail on the fixture.

The above object of the present invention can be achieved by the following technical solutions: a method for replacing a reverse thrust C duct sliding rail structure of a V2500 engine comprises the following steps:

(S1) acquiring a complete set of digital analogy of the reverse-thrust C duct of the V2500 engine through reverse engineering to obtain the structural size of the reverse-thrust C duct;

(S2) manufacturing a frame according to the structural size of the reverse C duct;

(S3) performing actual verification on the jig;

(S4) manufacturing a joint arm, wherein the joint arm is arranged below the fixture, and a fixture positioning guide rail is also arranged below the joint arm;

(S5) positioning the position of the old reverse-thrust C duct sliding rail structure through the section frame, the joint arm and the section frame positioning guide rail, then dismantling the old reverse-thrust C duct sliding rail structure, installing a new reverse-thrust C duct sliding rail structure in situ, and finally removing the section frame, the joint arm and the section frame positioning guide rail to realize the replacement of the reverse-thrust C duct sliding rail structure of the V2500 engine.

In the method for replacing the reverse thrust C duct slide rail structure of the V2500 engine:

the upper and lower side sliding rails of the reverse thrust C duct are theoretically two absolute parallel lines, and in the manufacturing process, the fixture has the function of ensuring that the sliding rails on the two sides are parallel, so that interference and jamming are avoided and abrasion is avoided in the actuating process. Therefore, preferably, in the step (S2), only by mapping the obtained digifax, a set of mechanisms that can ensure absolute parallelism, fixed distance and relative angle between the replaced slide rail (new slide rail structure) and the original slide rail (old slide rail structure) and that the jig itself has good rigidity and does not deform or become unstable is designed and manufactured in a three-dimensional space.

In the step (S3), the model frame is actually verified, and it is found that the data measured by the model is very accurate after fitting, and the design concept of the model frame is that the model frame is fully positioned by the guide groove, and the OEM has a tolerance range in the manufacturing process, and the slide rail structure itself has a certain wear in the service process. When the fixture is used in practice, due to the fact that the rigidity is too large and errors are accumulated, the fixture is difficult to be smoothly installed on a C duct for positioning, and limitation is large.

This application is through experimental discovery, through technological improvement, gives the type frame and adds articulated arm, carries out the location verification earlier, fixes a position the slide rail structure that newly trades again after through, through the scale on the articulated arm, can perfect location slide rail position, and the tolerance is little, and the size is accurate.

Preferably, in the step (S3), the articulated arm includes a first connecting seat and a second connecting seat hinged to each other, the first connecting seat is disposed on a positioning rail of the jig, a guide groove is disposed on the jig, the second connecting seat is slidably disposed in the guide groove of the jig, and a scale is disposed on the guide groove.

Further, the articulated arm further comprises a spindle, and the first connecting seat and the second connecting seat are hinged to each other through the spindle.

Further, first connecting seat includes first connecting body and sleeve, first connecting body with type frame positioning guide fixed connection, the second connecting seat includes second connecting body and slider, wherein be equipped with the through-hole on the second connecting body, the one end of mandrel is run through the through-hole with the sleeve locks through first retaining member, the slider sets up in the guide way and through the locking of second retaining member.

Furthermore, a gasket is arranged between the second locking piece and the guide groove.

Preferably, the axial direction of the spindle and the sliding direction of the sliding block in the guide groove are perpendicular to each other.

In a preferred embodiment of the present invention, the first locking member is a wing nut, and the second locking member is a socket head set screw.

Preferably, the first connecting body may be fixedly connected to the thrust-reversing C duct slide rail by a screw.

Preferably, in the step (S5), the positions of the new and old reverse C duct slide rail structures are located by the scales on the guide grooves.

Compared with the prior art, the invention has the following advantages:

(1) the fixture, the joint arm and the fixture positioning guide rail have simple and light structures, are convenient to adjust, can save a large amount of installation and debugging time compared with a complete set of tools of an OEM (original equipment manufacturer), and are verified to be accurate in size after being used for multiple times, smooth to operate and free of secondary damage;

(2) the technical blockade of international OEM manufacturers is broken, the self-design and processing of the slide rail positioning type frame are realized, the technical bottleneck restricting the slide rail replacement work is broken through, and the real V2500 nacelle renovation full capability is realized;

(3) considerable outgoing maintenance cost is saved for enterprises.

Drawings

FIG. 1 is a schematic view showing the mounting of the jig, the articulated arm, and the jig positioning rail in example 1 without the first locking member, the second locking member, and the spacer;

FIG. 2 is a front view of FIG. 1 with the first retaining member, the second retaining member and the spacer installed, wherein A is an articulating arm;

FIG. 3 is an enlarged view of A in FIG. 2;

FIG. 4 is a cross-sectional view of A in FIG. 3;

wherein the labels in the figure are:

1 is a jig;

11 is a guide groove;

2 is a joint arm;

21 is a first connecting seat;

211 is a first connection body;

212 is a sleeve;

213 is a first locking member;

214 is a screw;

22 is a second connecting seat;

221 is a second connecting body;

222 is a slide block;

223 is a through hole;

224 is a second locking member;

225 is a gasket;

23 is a mandrel;

and 3, a fixture positioning guide rail.

Detailed Description