CN114248097A

CN114248097A - Bolt assembly top tool, bolt assembly system and bolt assembly method

Info

Publication number: CN114248097A
Application number: CN202010994433.9A
Authority: CN
Inventors: 郑思凯; 孔祥洪; 陈寿宇
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2022-03-29
Anticipated expiration: 2040-09-21
Also published as: CN114248097B

Abstract

An object of the present invention is to provide a bolt assembly jack and a bolt assembly method, which can achieve rapid and accurate assembly of a bolt in a narrow space. Another object of the present invention is to provide a bolt assembly system having the bolt assembly head as before. The bolt assembly jack for achieving the purpose comprises a support, a transmission piece, a jacking piece and a limiting piece. The bracket is provided with a first hole arranged along a first direction and a second hole arranged along a second direction, and the first direction is vertical to the second direction. The transmission part is movably arranged in the first hole, and the ejecting part is movably arranged in the second hole. The transmission part and the ejection part are matched in an inclined plane in the support, when the transmission part moves along the first direction, the ejection part is extruded by the transmission part at the inclined plane matching position to extend out of the second hole, and the limiting part limits the movement of the transmission part at the extending position of the ejection part.

Description

Bolt assembly top tool, bolt assembly system and bolt assembly method

Technical Field

The invention relates to a bolt assembly system, a bolt assembly top tool and an assembly method thereof.

Background

The high-pressure compressor rotor is an important component of an aircraft engine, and as shown in fig. 1, the high-pressure compressor rotor is a schematic diagram of an existing high-pressure compressor rotor and consists of multiple stages of disc drums 90, and the disc drums 90 are fixedly connected through fasteners 91.

The diameter phi of the disk center of the rotor of the engine is small, the distance A between the mounting position of the bolt and the disk center is large (A > phi), the axial distance H2 between adjacent disk drums is small, and the axial distance H1 between the mounting position of the bolt and the rear end face of the rotor disk drum is large (H1> H2). The rotor disk drum is in a reverse taper shape as shown in the figure, and the connecting position of the inner wall of the disk drum and the disk radial plate is provided with a fillet, so that the bottom of the bolt is an irregular plane, and the rotor disk drum belongs to a typical deep cavity narrow irregular space.

In the conventional assembly process, a worker needs to feed the fastening member 91 such as a bolt to the mounting hole from the hub, and manually fix the bolt in the mounting process until the nut is tightened. Because the bolt is in large quantity, the installation space is extremely narrow and small, invisible and high in installation difficulty, workers need to keep the bolt in a fixed posture for a long time, physical power is consumed greatly, and the installation of a whole circle of bolts needs to be completed for a long time.

Therefore, a bolt assembly system is needed to rapidly and accurately assemble the bolt in a narrow space.

Disclosure of Invention

One object of the present invention is to provide a bolt assembly jack, which can realize rapid and accurate assembly of a bolt in a narrow space.

Another object of the present invention is to provide a bolt assembly system having the bolt assembly head as described above.

Another object of the present invention is to provide a bolt assembling method, which can realize rapid and accurate assembling of a bolt in a narrow space.

To achieve the foregoing object, a bolt-assembling head comprising:

the device comprises a bracket, a first positioning device and a second positioning device, wherein the bracket is provided with a first hole formed along a first direction and a second hole formed along a second direction, and the first direction is vertical to the second direction;

the transmission part is movably arranged in the first hole;

the ejection piece is movably arranged in the second hole; and

a limiting member;

the transmission part and the ejecting part are matched with each other through an inner inclined surface of the support, when the transmission part moves along the first direction, the ejecting part is extruded by the transmission part at the inclined surface matching position to extend out of the second hole, and the limiting part limits the movement of the transmission part at the extending position of the ejecting part.

In one or more embodiments, the bracket has a movable slot therein, and the limiting member is a limiting pin movably disposed in the movable slot;

the transmission piece is provided with a limiting groove matched with the limiting pin, and the limiting groove is opposite to the limiting pin at the extending position.

In one or more embodiments, the bolt assembly top tool further includes an actuating member, the actuating member is connected to the transmission member and the limiting member, and the actuating member is operated to pull the transmission member out of the first hole along the first direction;

and simultaneously, operating the actuating piece to enable the limiting pin to enter the limiting groove or be separated from the limiting groove.

In one or more embodiments, the actuating member is an actuating cable, the bracket has a guide portion therein, and one end of the actuating member is connected to the transmission member, and the other end of the actuating member bypasses the guide portion and then is connected to the stopper pin.

In one or more embodiments, the bracket has a first guide groove and a second guide groove therein, at least one side of the transmission member has a first protrusion, and at least one side of the ejector member has a second protrusion;

the transmission part is connected with the first guide groove of the support in a matched mode through the first convex part, the ejection part is connected with the second guide groove of the support in a matched mode through the second convex part, the first guide groove guides the moving direction of the transmission part in a matched mode through the first convex part, and the second convex part guides the moving direction of the ejection part in a matched mode through the second guide groove.

To achieve the aforementioned further object, a bolt assembly system for assembling bolts in a rotor disc, comprising a bolt tightening tool, characterized in that,

the bolt assembling top tool is further provided;

wherein the bolt assembling ejector ejects a bolt in a rotor disc cavity, and the tightening tool is used for tightening the ejected bolt.

In one or more embodiments, the bolt assembly system is used for assembling bolts at a plurality of positions in the circumferential direction of the rotor disc, and the number of bolt assembly headers is the same as that of the positions of the bolts to be assembled in the rotor disc.

To achieve the aforementioned further object, a bolt assembling method for assembling a bolt in a rotor disk includes the steps of:

penetrating a bolt through a mounting hole of a disc drum of the air compressor;

providing bolt assembling top tools, and placing the bolt assembling top tools in positions corresponding to bolts in a disc cavity of the compressor, wherein each bolt assembling top tool comprises:

the transmission part is movably arranged in the first hole;

the ejection piece is movably arranged in the second hole; and

a limiting member;

the transmission piece and the ejecting piece are matched in an inclined plane in the bracket, when the transmission piece moves along the first direction, the ejecting piece is extruded by the transmission piece at the inclined plane matching position to extend out of the second hole, and the limiting piece limits the movement of the transmission piece at the extending position of the ejecting piece;

pushing the transmission piece to move the ejection piece to the extended position so as to eject the bolt out of the mounting hole;

providing a tightening tool, and tightening a nut on the ejected bolt;

operating the drive member to drop the ejector member to allow the bolt-fitting ejector to exit the disc cavity;

and repeating the operation to assemble a plurality of bolts along the circumferential direction of the disk drum of the compressor.

In one or more embodiments, the bolt assembly top tool includes an actuating member, the actuating member is connected to the transmission member and the limiting member, respectively, the actuating member is operated to pull the transmission member out of the first hole in the first direction, and simultaneously, the actuating member is operated to make the limiting pin enter into or withdraw from the limiting groove;

the bolt assembling method includes:

pulling the actuator to drop the ejector, thereby allowing the bolt-on ejector to exit the disk cavity.

In one or more embodiments, the method comprises:

providing the bolt assembly jacking tools with the same number as the bolts to be assembled in the rotor disc;

said operating said drive member to drop said ejector comprises:

pulling the actuator to drop the plurality of ejectors simultaneously, thereby allowing the bolt-on ejector to exit the disc chamber.

In one or more embodiments, the method further comprises:

and after the bolt assembly of the previous-stage disc drum is completed, placing the bolt assembly jacking tool on the radial plate of the next-stage disc drum to complete the assembly of the next-stage disc drum.

The advanced effects of the invention include one or a combination of the following:

through setting up inclined plane complex driving medium and ejecting piece for when the driving medium moves, can be with the horizontal motion along first direction conversion to along the vertical motion of second direction. Thereby when screwing up the nut in the dish chamber, can be through converting horizontal motion into vertical motion to the one end that makes bolt spare and nut be connected can be by ejecting to the mounting hole outside, converts invisible mounted position into visual mounted position, has increased the convenience of bolt installation, has realized assembling fast, accurately to bolt in narrow and small space.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 shows a schematic view of a prior art high pressure compressor rotor;

FIG. 2 illustrates a perspective view of one embodiment of a bolt-on top tool;

FIG. 3 illustrates a cross-sectional view of one embodiment of a bolt-on top tool;

FIG. 4 illustrates a perspective view of one embodiment of a transmission;

FIG. 5 illustrates a perspective view of one embodiment of an ejector;

FIG. 6 illustrates a perspective view of one embodiment of a stop;

FIG. 7 illustrates a perspective view of one embodiment of a bolt-on top;

fig. 8 to 9 are schematic views illustrating a process for assembling bolts according to an embodiment of the bolt assembly head.

Detailed Description

The following discloses many different embodiments or examples for implementing the subject technology described. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and are not intended to limit the scope of the present disclosure. For example, if a first feature is formed over or on a second feature described later in the specification, this may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated among the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.

It should be noted that, where used, the following description of upper, lower, left, right, front, rear, top, bottom, positive, negative, clockwise, and counterclockwise are used for convenience only and do not imply any particular fixed orientation. In fact, they are used to reflect the relative position and/or orientation between the various parts of the object.

It is noted that these and other figures which follow are merely exemplary and not drawn to scale and should not be considered as limiting the scope of the invention as it is actually claimed. Further, the conversion methods in the different embodiments may be appropriately combined.

It should be noted that the reference numerals described later and the reference numerals in the background art use different labeling systems, and there is no correlation between the reference numerals.

To solve one or more problems in the prior art, an aspect of the present invention provides a bolt-assembling head, such as fig. 2 shows a perspective view of an embodiment of the bolt-assembling head, and fig. 3 shows a cross-sectional view of the embodiment of the bolt-assembling head.

Referring to fig. 2 and fig. 3, the bolt assembly top 100 includes a bracket 1, a transmission member 2, a pushing member 3, and a limiting member 4. The bracket 1 is provided with a first hole 11 along a first direction a and a second hole 12 along a second direction b, wherein the first direction a is perpendicular to the second direction b.

The transmission member 2 is disposed in the first hole 11 and movable along the first direction a. The ejector 3 is disposed in the second hole 12 and movable in the second direction b.

Wherein, driving medium 2 and liftout 3 slope cooperation in support 1, when driving medium 2 moves along first direction a to stretch into support 1 inside often, liftout 3 is extruded by driving medium 2 in slope cooperation department in order to stretch out second hole 12, moves to the extended position as shown in fig. 2 and fig. 3. The limiting member 4 limits the movement of the transmission member 2 when the ejector member 3 is in the extended position.

In particular, fig. 4 shows a perspective view of an embodiment of the transmission element 2, and fig. 5 shows a perspective view of an embodiment of the ejection element 3. Wherein the one end that driving medium 2 stretched into support 1 inside has first cooperation inclined plane 20, the one end that liftout piece 3 stretched into support 1 inside has second cooperation inclined plane 30, through first cooperation inclined plane 20 and the cooperation of second cooperation inclined plane 30 inclined plane transmission between driving medium 2 and the liftout piece 3, so that when driving medium 2 was inside the activity to support 1 along first direction a, first cooperation inclined plane 20 extrudeed second cooperation inclined plane 30, make liftout piece 3 along first cooperation inclined plane 20 and upward movement, and stretch out to the extended position as shown in figure 2 and figure 3.

By providing the bevel-engaging transmission element 2 and the ejector element 3, a horizontal movement in the first direction a can be converted into a vertical movement in the second direction b when the transmission element 2 moves. Thereby when screwing up the nut in the dish chamber, can be through converting horizontal motion into vertical motion to the one end that makes bolt spare be connected with the nut can be ejected to the mounting hole outside, with the mounting position that will not see converts visual mounting position into visual mounting position, has increased the convenience of bolt installation.

Although one embodiment of the present bolting top is described above, in other embodiments of the present bolting top, the present bolting top may have more details in many respects than the above-described embodiments, and at least a part of the details may have various variations. At least some of these details and variations are described below in several embodiments.

Referring to fig. 2 to 5, in an embodiment of the bolt assembly top tool, a movable groove 10 is formed in the bracket 1, and the limiting member 4 is a limiting pin disposed in the movable groove 10 as shown in fig. 6. Wherein, have the spacing groove 21 with the fitting of spacer pin 4 in the driving medium 2, when the liftout piece 3 is extruded by the driving medium 2 to the extended position as shown in fig. 2 and fig. 3, the position of spacing groove 21 just is relative with spacer pin 4 to allow spacer pin 4 to fall to in the spacing groove 21, because the activity of spacer pin 4 along first direction a has been restricted to movable groove 10 this moment, thereby make spacer pin 4 restrict the activity of driving medium 2 along first direction a.

In some other embodiments, different from the one shown in the drawings, the structure and/or the manner of the limiting member 4 may have many suitable variations or modifications, for example, in one embodiment, the limiting member 4 may be a snap-fit structure to limit the transmission member 2 by a snap-fit connection in the extended position.

With continued reference to fig. 2 to fig. 6, in an embodiment of the bolt assembly top 100, the bolt assembly top 100 further includes an actuating member 5, the actuating member 5 is respectively connected to the transmission member 2 and the limiting member 4, the actuating member 5 is operated to pull the transmission member 2 out of the first hole 11 along the first direction a, and the actuating member 5 is operated to allow the limiting pin 4 to enter the limiting groove 21 or to be disengaged from the limiting groove 21.

Specifically, in one embodiment of the bolt-on top tool, the actuating member 5 is an actuating cable in a rope shape as shown in the figure, and one end of the actuating member 5 is connected with the transmission member. The holder 10 has a guide portion 13 therein, and the other end of the actuator 5 is connected to the stopper pin 4 after bypassing the guide portion 13, and is guided by the guide portion 13 so that the pulling direction of the actuator 5 to the stopper pin 4 is changed from the horizontal direction along the first direction a to the vertical direction along the second direction b. In operation, the actuator 5 is pulled at one end to pull the transmission member 2 out of the first hole 11, the other end of the actuator 5 is loosened to cause the stopper pin 4 to fall down into the stopper groove 21 under the action of gravity, and the other end of the actuator 5 is pulled to cause the stopper pin 4 to be pulled up from the stopper groove 21 under the action of tension. When the limit pin 4 is pulled up from the limit groove 21, pulling one end of the actuating member 5 can pull the transmission member 2 out of the first hole 11, and the ejecting member 3 moves downward along the first matching inclined surface 20 under the action of gravity and retracts into the second hole 12, thereby allowing the bolt-assembling ejector 100 to be taken out of the disc cavity.

In some other embodiments than those shown, the structure of the actuating member 5 may be modified or varied in many ways, for example, in one embodiment, the actuating member 5 may be a pull ring structure connected to the position-limiting pin 4 and the driving member 2, respectively, and the driving member 2 may be pulled out of the first hole 11 or the position-limiting pin 4 may be pulled up or down from the position-limiting groove 21 by operating the pull ring structures, respectively.

In one embodiment of the screw-mounted top tool, the transmission member 2 has a lug structure 22, the lug structure 22 has a hole therein for allowing the actuator 5 to pass through, and the actuator 5 is connected to the transmission member 2 through the lug structure 22.

In one embodiment of the bolt-assembling top tool, the stopper pin 4 is provided with a connecting ring groove 40 therein, the connecting ring groove 40 allows the actuating member 5 to enter and surround the outer peripheral side of the stopper pin 4, and the actuating member 5 surrounds the connecting ring groove 40 to connect with the stopper pin 4. At the same time, the connecting ring groove 40 prevents play between the actuating element 5 and the limit pin in the connected state.

In one embodiment of the bolt assembly top tool, the two ends of the limit pin 4 are respectively provided with a stopping part 41, and in the assembly state, the stopping parts 41 are abutted against the periphery of the movable groove 10 to prevent the limit pin 4 from being separated from the movable groove 10.

In one embodiment of the bolt-on top, the bracket 1 has a first guide groove 15 and a second guide groove 16 therein, at least one side of the transmission member 2 has a first projection 25, and at least one side of the ejector member 3 has a second projection 36. Wherein, driving medium 2 is connected through the first convex part and the first guide way 15 cooperation of 25 support 1 under the assembled condition, liftout piece 3 is connected through the second guide way 16 cooperation of second convex part 36 with support 1, the movable direction of first guide way 15 and first convex part 25 cooperation guide driving medium 2, the movable direction of second convex part 36 and second guide way 16 cooperation guide liftout piece 3, meanwhile, the movable distance of driving medium 2 and liftout piece 3 is injectd jointly in the cooperation of first guide way 15 and first convex part 25, second convex part 36 and the cooperation of second guide way 16. In one embodiment, the first protrusion 25 and the second protrusion 36 are respectively disposed on both sides of the driver 2 and the ejector 3. In one embodiment, the first and

second protrusions

25, 36 are guide pins.

In other embodiments than those shown, the guiding structure and/or the manner of the transmission element 2 and/or the ejector element 3 in the frame 1 may be subject to many suitable modifications or variations, such as in one embodiment the transmission element 2 and/or the ejector element 3 is guided in the frame 1 by means of a sliding track.

The bolt-fitting head according to one or more embodiments described above may be applied to a bolt-fitting system as shown in fig. 7, and the bolt-fitting system further includes a bolt tightening tool (not shown) such as a wrench, which is used in cooperation with the bolt-fitting head 100. In this case, the screw assembly head 100 ejects the screw 7 in the disk cavity of the rotor disk 8, and the screw tightening tool is used to tighten the nut onto the ejected screw.

In one embodiment of the bolt assembly system, the rotor disk 8 is in a rotating structure as shown in the figure, the bolts 7 to be assembled are divided into a plurality in steps along the circumferential direction of the rotor disk 8, the number of the bolt assembly jacks 100 is the same as that of the bolts 7 to be assembled in the rotor disk 8 as shown in the figure, so that each bolt assembly jack 100 can correspond to one bolt 7 to be assembled to realize the simultaneous jacking operation of a plurality of bolts 7. While the actuators 5 are respectively disposed toward the center of the rotor disk 8 as shown in fig. 7 to allow simultaneous pulling operation of a plurality of actuators 5 from one place to achieve simultaneous pulling back of the ejector 3 of a plurality of bolt-fitting ejectors 100.

In one embodiment of the bolt assembly system, the bolt assembly top 100 may be provided as only one, and the assembling work of the bolts 7 to be assembled in the circumferential direction is realized by moving the position of the bolt assembly top 100.

Another aspect of the invention provides a bolt assembly method for assembling bolts 7 in a rotor disc 8, comprising the following steps.

Referring to fig. 8 and 9, first, bolts are inserted through the mounting holes 80 of the compressor drum.

Subsequently, bolt-mounting heads 100 are provided and placed in the compressor disk cavity 81 at positions corresponding to the bolts 7, and the structure of each bolt-mounting head 100 may be the same as that of the bolt-mounting head 100 in one or more of the foregoing embodiments, and will not be described herein in detail.

The driving member 2 of the bolt-fitting header 100 is then pushed so that the driving member 2 presses the ejector 3 to move to the extended position against the lower side of the bolt 7, as shown in fig. 8, at which time the bolt 7 extends outside the mounting hole 80 and is supported by the bolt-fitting header 100, while the stopper 4 restricts the movement of the driving member 2 and keeps the ejector 3 in the extended position.

A tightening tool is then provided to tighten the nut 6 onto the ejected bolt 7, completing the assembly of the ejected bolt 7.

After one assembly is completed, the driving member 2 is operated so that the ejector member 3 falls down, thereby allowing the bolt-assembling top 100 to leave the compressor disk cavity 81 as shown in fig. 9.

The above operation is then repeated, and a plurality of bolts 7 along the circumferential direction of the compressor drum are assembled.

In one embodiment of the bolt assembling method, the bolt assembling head 100 further includes an actuating member 5 as in the above-described one embodiment. The bolt assembling method further includes:

by pulling the actuating member 5, the ejector 3 is dropped, thereby allowing the bolt-fitting ejector 100 to leave the compressor disk chamber 81. Specifically, the actuator 5 is pulled at one end to pull the transmission member 2 out of the first hole 11, the actuator 5 is loosened at the other end to cause the stopper pin 4 to fall down into the stopper groove 21 by gravity, and the actuator 5 is pulled at the other end to cause the stopper pin 4 to be pulled up from the stopper groove 21 by a tensile force. When the limit pin 4 is pulled up from the limit groove 21, pulling one end of the actuating member 5 can pull the transmission member 2 out of the first hole 11, and the ejector member 3 moves downward along the first inclined mating surface 20 under the action of gravity and retracts into the second hole 12, thereby allowing the bolt-assembling jack 100 to be taken out of the disc cavity 81.

In one embodiment of the bolt assembly method, the disk chamber 81 has an entrance 810 and a mounting chamber 811, wherein the entrance 810 has a height that is less than the height of the mounting chamber 811 (see background art fig. 1). The bolt-fitting top 100 is configured such that the height of the bolt-fitting top 100 is the same as the height of the mounting cavity 811 when the ejector 3 is protruded from the second hole 12, and the height of the bolt-fitting top 100 is smaller than the height at the inlet 810 when the ejector 3 is retracted into the second hole 12.

In one embodiment of the bolt fitting method, the number of the bolt fitting headers 100 may be plural as shown in fig. 7. In this embodiment, the step of operating the transmission member 2 to drop the ejector member 3 comprises:

by pulling the actuating member 5, the plurality of ejector members 3 can be simultaneously dropped, thereby allowing the bolt-fitted ejector 100 to leave the disk chamber 81.

In one embodiment of the bolt assembling method, the bolt assembling method further includes:

after the bolt assembly of the previous stage of disc drum is completed, the bolt assembly jack 100 is placed on the radial plate of the first stage of disc drum to complete the assembly of the next stage of disc drum.

Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.

Claims

1. A bolt assembly top tool is characterized by comprising:

the transmission part is movably arranged in the first hole;

the ejection piece is movably arranged in the second hole; and

a limiting member;

2. The bolt assembling head tool of claim 1, wherein the bracket has a movable slot therein, and the retainer is a retainer pin movably disposed in the movable slot;

3. The bolt-assembling head tool of claim 2, further comprising an actuating member, said actuating member being connected to said transmission member and said limiting member, respectively, said actuating member being operated to pull said transmission member out of said first hole in said first direction;

4. The bolt-assembling head tool of claim 3, wherein said actuator is an actuating cable, and said housing has a guide portion therein, and one end of said actuator is connected to said driving member, and the other end of said actuator is connected to said stopper pin after passing through said guide portion.

5. The bolt-assembling head according to claim 1, wherein said bracket has a first guide groove and a second guide groove therein, at least one side of said driving member has a first protrusion, and at least one side of said ejector member has a second protrusion;

6. A bolt assembly system for assembling bolts in a rotor disc, comprising a bolt tightening tool, characterized in that,

further comprising the bolt-assembled roof as recited in any one of claims 1 to 5;

7. The bolt assembly system of claim 6,

the bolt assembling system is used for assembling bolts at a plurality of positions in the circumferential direction of the rotor disc, and the number of the bolt assembling lifters is the same as that of the positions, to be assembled, of the bolts in the rotor disc.

8. A bolt assembly method for assembling bolts in a rotor disc, comprising the steps of:

the transmission part is movably arranged in the first hole;

the ejection piece is movably arranged in the second hole; and

a limiting member;

providing a tightening tool, and tightening a nut on the ejected bolt;

9. The bolt assembling method according to claim 8,

the bolt assembling top tool comprises an actuating piece, the actuating piece is respectively connected with the transmission piece and the limiting piece, the actuating piece is operated to pull the transmission piece out of the first hole along the first direction, and meanwhile, the actuating piece is operated to enable the limiting pin to enter the limiting groove or be pulled out of the limiting groove;

the bolt assembling method includes:

10. The bolt assembling method according to claim 9,

said operating said drive member to drop said ejector comprises:

11. The bolt assembling method according to claim 8, further comprising: