CN219599366U

CN219599366U - Tool for assembling and disassembling B-737NG landing gear side support column spring screw head

Info

Publication number: CN219599366U
Application number: CN202321232804.5U
Authority: CN
Inventors: 于克良; 谭兴昆; 何国杰; 李金劲; 李汝忠; 李炼煌; 胡骁
Original assignee: Guangzhou Aircraft Maintenance Engineering Co Ltd
Current assignee: Guangzhou Aircraft Maintenance Engineering Co Ltd
Priority date: 2023-05-22
Filing date: 2023-05-22
Publication date: 2023-08-29
Anticipated expiration: 2033-05-22

Abstract

The utility model discloses a tool for assembling and disassembling a B-737NG undercarriage side support column spring screw head, which comprises the following components: the base is internally provided with an annular groove and an internal thread groove from top to bottom, and the bottom of the base is provided with a first clamping assembly; the adjusting disc comprises a disc main body, a ratchet wheel and an external thread column from top to bottom, and a second clamping assembly is arranged at the top of the disc main body; the front end of the limiting pin is provided with a stop claw matched with the ratchet wheel; and the elastic limiting component is sleeved on the limiting pin. The utility model is convenient for the disassembly and the assembly of the screw head of the side strut spring of the landing gear, and reduces the maintenance cost.

Description

Tool for assembling and disassembling B-737NG landing gear side support column spring screw head

Technical Field

The utility model relates to a tool for assembling and disassembling a B-737NG landing gear side strut spring screw head.

Background

The B737NG landing gear side leg spring requires cleaning, nylon coating removal, nondestructive testing, bushing installation, nylon coating spraying, testing, and the like for each maintenance. The structure of the landing gear leg spring screw head is shown in fig. 1, because the installation state is not a natural shrinkage state, the screw heads at the two ends cannot be detached or installed in the natural shrinkage state, the price of one leg spring screw is about 3800 dollars, and a set of landing gear is provided with 4 leg springs, which are expensive, the maintenance of the landing gear leg springs is completed for the outer principal unit without professional maintenance conditions, and the single leg spring cannot be maintained for the outer principal unit, so the maintenance cost of the landing gear leg spring screw head is suddenly increased. The using method of the existing maintenace tool for the pillar spring screw head is as follows: the pillar spring is screwed into the pitch sleeve matched with the pillar spring, and the pillar spring in a natural shrinkage state is stretched to a proper length by a stretcher, so that the screw head can be disassembled. The operation method is easy to cause injury to human body, has high requirements on the material strength of the tooling and the design of the tooling, and is inconvenient to operate due to high cost of the tooling. In view of this, there is a need to overcome the maintenance difficulties of landing gear side strut springs.

Disclosure of Invention

The utility model aims to provide a tool for assembling and disassembling a B-737NG landing gear side support column spring screw head, which is convenient for disassembling and assembling the landing gear side support column spring screw head and reduces the maintenance cost.

The aim of the utility model can be achieved by the following technical scheme.

A tooling for loading and unloading a B-737NG landing gear side strut spring screw head, comprising: the base is of a sleeve-shaped structure, an annular groove and an internal thread groove are respectively arranged in the base from top to bottom, and a first clamping assembly for fixing one end of a landing gear side strut spring is arranged at the bottom of the base;

the adjusting disc comprises a disc main body, a ratchet wheel and an external thread column from top to bottom, wherein the disc main body, the ratchet wheel and the internal of the external thread column are of hollow structures which are communicated with each other, the ratchet wheel can be movably arranged in the annular groove of the base up and down, the external thread column is connected with the internal thread groove of the base, and the top of the disc main body is provided with a second clamping assembly used for fixing the other end of the landing gear side strut spring;

the front end of the limiting pin is provided with a stop claw matched with the ratchet wheel, the stop claw is used for being clamped with a tooth slot of the ratchet wheel to prevent the adjusting disc from reversing, and the limiting pin passes through a mounting hole formed in the side wall of the annular groove of the base from the outside to enable the stop claw to be abutted against the ratchet wheel;

the elastic limiting component is sleeved on the limiting pin and used for adaptively adjusting the length of the limiting pin extending into the mounting hole in the rotation process of the ratchet wheel.

The utility model also has the following improved preferable scheme:

as a preferable technical scheme of the utility model, the elastic limiting component comprises a pin sleeve and a limiting spring sleeved on the limiting pin, the front end of the pin sleeve is fixedly connected with the mounting hole through threads, the limiting pin is positioned in the pin sleeve, the front end of the limiting pin is further provided with an end surface circular plate, one side surface of the end surface circular plate is provided with the stop pawl, the other side surface of the end surface circular plate is abutted against one end of the limiting spring, and the other end of the limiting spring is abutted against the rear end of the inner wall of the pin sleeve.

As a preferable embodiment of the present utility model, a ring plate for abutting against the end face circular plate of the stopper pin is provided in the mounting hole.

As a preferable technical scheme of the utility model, the rear end of the pin sleeve is provided with a rear end head, the rear end head of the pin sleeve is of a hollow structure for the limiting pin to pass through and is provided with an open clamping groove, the rear end of the limiting pin is provided with a jack corresponding to the clamping groove, the jack is internally provided with a plug post, and two ends of the plug post, which are exposed out of the jack, are positioned in the clamping groove.

As a preferable technical scheme of the utility model, the rear end of the limiting pin is connected with an adjusting ring, the adjusting ring is embedded into the rear end of the limiting pin, and the ring body fracture connection part of the adjusting ring is positioned in the rear end of the limiting pin.

As a preferable technical scheme of the utility model, the bottom of the outer wall of the base is symmetrically provided with the assembly grooves which are convenient for clamping the base by using the bench vice.

As a preferable technical scheme of the utility model, adjusting handle connecting screw holes for connecting the adjusting handles by threads are symmetrically formed on two sides of the adjusting disc.

As a preferable technical scheme of the utility model, the first clamping assembly comprises a first groove formed in the bottom of the base, a first screw hole formed in the first groove, a pressing block arranged in the first groove and a first bolt penetrating through the pressing block and matched with the first screw hole.

As a preferable technical scheme of the utility model, the second clamping assembly comprises a second groove formed in the top of the adjusting disc, a second screw hole formed in the second groove, an upper pressing block arranged in the second groove and a second bolt penetrating the upper pressing block and being matched with the second screw hole.

The utility model has the following beneficial effects:

the tool is integrated, the pillar spring can be placed in the hollow structure of the tool, the two ends of the pillar spring are fixed, the pillar spring can be adjusted to a proper length by rotating the adjusting disc, and the screw head can be detached or installed, so that the adjusting disc can be prevented from reversing in the process. Compared with the existing disassembly and assembly method, the operation is more convenient, and the disassembly and the assembly of the landing gear side pillar spring screw head can be completed by one person, so that the personal can not be injured. And the design is ingenious and the cost is low. The length adjusting range of the strut spring is determined by the threaded connection length of the base and the adjusting disc, and the adjustable range is long.

Drawings

FIG. 1 is a block diagram of a landing gear side leg spring and its screw head;

FIG. 2 is an exploded view of a tooling of the present utility model;

FIG. 3 is an exploded view of the tool of FIG. 2 in another perspective;

FIG. 4 is an exploded view of the tuning disk of the tooling of FIG. 2;

FIG. 5 is an exploded view of the base of the tooling of FIG. 2;

FIG. 6 is an exploded view of the base of FIG. 5 in another angle;

FIG. 7 is a plan view of the stop pin of the tooling of FIG. 2 and its resilient stop assembly;

FIG. 8 is a C-C cross-sectional view of FIG. 7;

fig. 9 is an enlarged view of a portion a in fig. 2;

fig. 10 is an enlarged view of the portion B in fig. 3.

Reference numerals illustrate: 1. a base; 101. an annular groove; 102. an internal thread groove; 103. a mounting hole; 104. a ring plate; 105. a first groove; 106. a first screw hole; 107. an assembly groove; 2. an adjusting plate; 201. a ratchet wheel; 202. an external threaded column; 203. an adjusting handle; 204. a second groove; 205. a second screw hole; 206. the adjusting handle is connected with the screw hole; 3. a limiting pin; 301. an end face circular plate; 302. a locking claw; 303. a jack; 304. inserting a column; 305. an adjusting ring; 4. a pin sleeve; 401. a clamping groove; 5. pressing the block; 6. a first bolt; 7. pressing into blocks; 8. a second bolt; 9. and a limit spring.

Detailed Description

The following detailed description of the present utility model is presented in conjunction with the drawings and examples to enable one of ordinary skill in the art to better understand and practice the present utility model.

As shown in fig. 2 to 10, a tooling for loading and unloading a B-737NG landing gear side strut spring screw head, comprising:

the landing gear side support spring comprises a base 1, wherein the base 1 is of a sleeve-shaped structure, an annular groove 101 and an internal thread groove 102 are respectively formed in the base 1 from top to bottom, and a first clamping assembly for fixing one end of the landing gear side support spring is arranged at the bottom of the base 1;

the adjusting disc 2 comprises a disc main body, a ratchet 201 and an external thread column 202 from top to bottom, wherein the interiors of the disc main body, the ratchet 201 and the external thread column 202 are hollow structures communicated with each other, the ratchet 201 can be movably arranged in the annular groove 101 of the base 1 up and down, the external thread column 202 is connected with the internal thread groove 102 of the base 1, and the top of the disc main body is provided with a second clamping assembly for fixing the other end of the landing gear side strut spring;

the front end of the limiting pin 3 is provided with a locking claw 302 matched with the ratchet wheel 201, the locking claw 302 is used for being clamped with a tooth slot of the ratchet wheel 201 to prevent the adjusting disc 2 from reversing, and the limiting pin 3 passes through a mounting hole 103 formed in the side wall of the annular groove 101 of the base 1 from the outside to enable the locking claw 302 to be abutted against the ratchet wheel 201;

the elastic limiting component is sleeved on the limiting pin 3 and is used for adaptively adjusting the length of the limiting pin 3 extending into the mounting hole 103 in the rotation process of the ratchet 201.

As a preferred embodiment:

as shown in fig. 7 and 8, the elastic limiting component comprises a pin sleeve 4 and a limiting spring 9 sleeved on the limiting pin 3, the front end of the pin sleeve 4 is fixedly connected with the mounting hole 103 through threads, the limiting pin 3 is located inside the pin sleeve 4, an end face circular plate 301 is further arranged at the front end of the limiting pin 3, a stop pawl 302 is arranged on one side face of the end face circular plate 301, the other side face of the end face circular plate 301 is abutted against one end of the limiting spring 9, the other end of the limiting spring 9 is abutted against the rear end of the inner wall of the pin sleeve 4, and the limiting spring 9 is used for providing elastic force for locking the stop pawl 302 and a tooth groove of the ratchet 201 to prevent the adjusting disc 2 from reversing.

Specifically, referring to fig. 5, a ring plate 104 for abutting against the end-face circular plate 301 of the stopper pin 3 is provided in the mounting hole 103.

Referring to fig. 7 and 8, a rear end of the pin bush 4 is provided with a rear end, the rear end of the pin bush 4 is of a hollow structure for the stop pin 3 to pass through and is provided with an open clamping groove 401, the rear end of the stop pin 3 is provided with a jack 303 corresponding to the position of the clamping groove 401, the jack 303 is internally provided with a plug post 304, and two ends of the plug post 304 exposed out of the jack 303 are positioned in the clamping groove 401.

The rear end of the limiting pin 3 is connected with an adjusting ring 305, the adjusting ring 305 is embedded into the rear end of the limiting pin 3, and the fracture joint of the ring body of the adjusting ring 305 is positioned in the rear end of the limiting pin 3. The limiting pin 3 can be pulled outwards by a certain distance through the adjusting ring 305, so that the locking claw 302 is separated from the tooth groove of the ratchet wheel 201, and the adjusting disk 2 can rotate in the opposite direction.

The limiting pin 3 is detachably assembled, and the specific operation is that the adjusting disc 2 is detached from the base 1, the pin sleeve 4 is rotated by rotating the adjusting ring 305, the pin sleeve 4 is taken out of the mounting hole 103, the inserting column 304 is pulled out of the inserting hole 303, the adjusting ring 305 is broken to two sides to separate the ring body fracture, so that the ring body fracture is detached from the rear end of the limiting pin 3, and then the limiting pin 3 and the limiting spring 9 are taken out from the other end of the pin sleeve 4. The limit pin 3 and the pin bush 4 are convenient to replace parts in a disassembly type assembly mode, and maintenance cost is reduced.

In this embodiment, the bottom of the outer wall of the base 1 is symmetrically provided with the assembly groove 107 for clamping the base 1 by using a bench vice, and when the screw head of the pillar spring is assembled, the bench vice is used to clamp the assembly groove 107 of the base 1, and the base 1 is fixed by means of the bench vice.

The adjusting disk 2 is symmetrically provided with adjusting handle connecting screw holes 206 for screw-connecting the adjusting handle 203 on both sides. The setting of the adjusting handle 203 can facilitate the rotation of the adjusting disk 2, and the rotation operation is more labor-saving.

In this embodiment, as shown in fig. 10, the first clamping assembly includes a first groove 105 formed at the bottom of the base 1, a first screw hole 106 formed on the first groove 105, a pressing block 5 formed inside the first groove 105, and a first bolt 6 penetrating the pressing block 5 and matching the first screw hole 106, where the pressing block 5 is locked by the first bolt 6, and the end of the pressing block 5 with a notch and a step groove can be fixedly connected with the bottom end of the pillar spring.

As shown in fig. 9, the second clamping assembly includes a second groove 204 formed in the top of the adjusting disc 2, a second screw hole 205 formed in the second groove 204, an upper pressing block 7 formed in the second groove 204, and a second bolt 8 penetrating the upper pressing block 7 and adapted to the second screw hole 205, wherein the second bolt 8 locks the upper pressing block 7, and the end of the upper pressing block 7 can be abutted against and fixed to the top end of the strut spring.

The working principle of the utility model is specifically described below by taking the mounting and dismounting of the B737NG landing gear side strut spring and the screw head thereof as examples, wherein the diameter of the strut spring is 45 mm, the screw pitch is 7 mm when the strut spring is not stretched, the spring cannot be stretched by manual force, the diameter of the screw head is 33 mm, and the screw pitch is 8.5 mm.

The base 1 and the adjusting disc 2 in the embodiment are well connected through threads, the tool is assembled, the pillar spring is placed in a hollow structure of the tool, through measurement and investigation, the threaded connection length of the base 1 and the adjusting disc 2 is adjusted, two ends of the pillar spring are clamped through the first clamping assembly and the second clamping assembly, then the pillar spring is rotated in the opposite direction of the pillar spring, the pillar spring is rotated to a diameter of 48.5 mm, at the moment, the screw pitch of the screw head is identical to the screw pitch of the pillar spring, and the screw head can be detached or installed very easily. In order to ensure the safety of the disassembly and assembly process, the bottom of the tool is clamped by a bench vice to fix the assembly groove 107, and the top of the tool is rotationally compressed by using an adjusting disc 2 as a screw cap; in order to prevent the strut spring from rebounding to hurt people or hurt workpieces due to insufficient force in the rotating process, the ratchet 201 structure and the limiting pin 3 are arranged to prevent the adjusting disc 2 from reversing, so that the strut spring is prevented from driving the tool to rebound.

The tool of this embodiment is used in more detail as follows:

firstly, the external thread column 202 of the adjusting disc 2 is arranged in the internal thread groove 102 of the base 1 in a threaded manner, then the pillar spring is arranged in the adjusting disc 2 and the base 1, the lower pressing block 5 is arranged in the first groove 105 to be in contact with the bottom end of the pillar spring, the upper pressing block 7 is arranged in the second groove 204 to be in contact with the top end of the pillar spring, so that the pillar spring is arranged in a tool consisting of the base 1, the adjusting disc 2 and other structures, the adjusting disc 2 is rotated in the opposite direction through the adjusting handle 203 and the pillar spring, at the moment, the external thread column 202 is matched with the internal thread groove 102 to enable the top of the adjusting disc 2 to be lifted, the pitch of the pillar spring is increased until the pitch of the pillar spring is the same as that of the screw head, and the disassembling and assembling of the screw head can be completed very easily.

In the above adjustment process, the operation process of the limit pin 3 is as follows:

when the adjusting disk 2 is rotated, the ratchet 201 is driven to rotate in the annular groove 101, and when the stop pawl 302 moves between tooth grooves of the ratchet 201, the end face circular plate 301 continuously extrudes the limit spring 9, so that the stop pawl 302 drives the end face circular plate 301 and the limit pin 3 to reciprocate and stretch in the pin sleeve 4, the stop pawl 302 is always elastically clamped with the tooth grooves of the ratchet 201, and the stop pawl 302 limits the ratchet 201 to rotate in the opposite direction, so that people are prevented from being injured by inversion or workpieces are prevented from being damaged; after the screw head and the pillar spring are disassembled, the lower pressing block 5 and the upper pressing block 7 are disassembled to take out the pillar spring, the limiting pin 3 and the locking claw 302 are pulled by the adjusting ring 305 to separate the locking claw 302 from the ratchet 201, and at the moment, the connecting state of the external thread column 202 and the internal thread groove 102 can be reset by the reverse adjusting disk 2, so that the pillar spring can be conveniently disassembled and assembled again by using the tool.

The above embodiments are only preferred embodiments of the present utility model, but not limiting, and any modifications and improvements based on the concept of the present utility model should fall within the scope of the present utility model, and the specific scope of the present utility model is defined by the claims.

Claims

1. A tooling for assembling and disassembling a B-737NG landing gear side strut spring screw head, comprising:

the base (1), base (1) is sleeve-shaped structure, annular groove (101) and internal thread groove (102) are set up in base (1) from top to bottom respectively, the bottom of base (1) is provided with the first chucking subassembly that is used for fixing landing gear side strut spring one end;

the adjusting disc (2) comprises a disc main body, a ratchet wheel (201) and an external thread column (202) from top to bottom, wherein the interiors of the disc main body, the ratchet wheel (201) and the external thread column (202) are hollow structures communicated with each other, the ratchet wheel (201) can be movably arranged in the annular groove (101) of the base (1) up and down, the external thread column (202) is connected with an internal thread groove (102) of the base (1), and a second clamping assembly used for fixing the other end of a strut spring at the side of the landing gear is arranged at the top of the disc main body;

the front end of the limiting pin (3) is provided with a locking claw (302) matched with the ratchet wheel (201), the locking claw (302) is used for being clamped with a tooth groove of the ratchet wheel (201) to prevent the adjusting disc (2) from reversing, and the limiting pin (3) passes through a mounting hole (103) formed in the side wall of the annular groove (101) of the base (1) from the outside to enable the locking claw (302) to be abutted against the ratchet wheel (201);

the elastic limiting component is sleeved on the limiting pin (3) and is used for adaptively adjusting the length of the limiting pin (3) extending into the mounting hole (103) in the rotating process of the ratchet wheel (201).

2. The tooling for loading and unloading a B-737NG landing gear side strut spring screw head as defined in claim 1, wherein: the elastic limiting assembly comprises a pin sleeve (4) and a limiting spring (9) sleeved on the limiting pin (3), the front end of the pin sleeve (4) is fixedly connected with the mounting hole (103) through threads, the limiting pin (3) is located inside the pin sleeve (4), an end face circular plate (301) is further arranged at the front end of the limiting pin (3), one side face of the end face circular plate (301) is provided with a stop pawl (302), the other side face of the end face circular plate (301) is abutted against one end of the limiting spring (9), and the other end of the limiting spring (9) is abutted against the rear end of the inner wall of the pin sleeve (4).

3. The tooling for loading and unloading a B-737NG landing gear side strut spring screw head as defined in claim 2, wherein: an annular plate (104) for abutting against the end face circular plate (301) of the limit pin (3) is arranged in the mounting hole (103).

4. A tooling for loading and unloading a B-737NG landing gear side strut spring screw head as defined in claim 3, wherein: the rear end of the pin sleeve (4) is provided with a rear end head, the rear end head of the pin sleeve (4) is of a hollow structure for the limiting pin (3) to pass through and is provided with an open clamping groove (401), the rear end of the limiting pin (3) is provided with a jack (303) corresponding to the position of the clamping groove (401), the jack (303) is internally provided with a plug post (304), and the plug posts (304) are exposed out of the two ends of the jack (303) and are positioned in the clamping groove (401).

5. The tooling for loading and unloading a B-737NG landing gear side strut spring screw head as defined in claim 4, wherein: the rear end of the limiting pin (3) is connected with an adjusting ring (305), the adjusting ring (305) is embedded into the rear end of the limiting pin (3), and the fracture joint of the ring body of the adjusting ring (305) is positioned in the rear end of the limiting pin (3).

6. The tooling for loading and unloading a B-737NG landing gear side strut spring screw head as defined in claim 5, wherein: the bottom of the outer wall of the base (1) is symmetrically provided with an assembly groove (107) which is convenient for clamping the base by using a bench vice.

7. The tooling for loading and unloading a B-737NG landing gear side strut spring screw head as defined in claim 6, wherein: and adjusting handle connecting screw holes (206) for connecting the adjusting handles (203) by threads are symmetrically formed on two sides of the adjusting disc (2).

8. A tooling for B-737NG landing gear side stay spring screw head loading and unloading according to any one of claims 1 to 7, wherein: the first clamping assembly comprises a first groove (105) formed in the bottom of the base (1), a first screw hole (106) formed in the first groove (105), a lower pressing block (5) arranged in the first groove (105) and a first bolt (6) penetrating through the lower pressing block (5) and matched with the first screw hole (106).

9. A tooling for B-737NG landing gear side stay spring screw head loading and unloading according to any one of claims 1 to 7, wherein: the second clamping assembly comprises a second groove (204) formed in the top of the adjusting disc (2), a second screw hole (205) formed in the second groove (204), an upper pressing block (7) arranged in the second groove (204) and a second bolt (8) penetrating through the upper pressing block (7) and being matched with the second screw hole (205).