CN113547319A

CN113547319A - Tightening device

Info

Publication number: CN113547319A
Application number: CN202010338748.8A
Authority: CN
Inventors: 汪俊熙; 陈栋权; 汤福龙; 郭琳; 周晓丽
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2021-10-26
Anticipated expiration: 2040-04-26
Also published as: CN113547319B

Abstract

An object of the present invention is to provide a tightening device that enables efficient and accurate installation of a nut in a deep cavity. To achieve the above object, a tightening device for tightening a nut in a deep cavity includes a support assembly, a lifting assembly, a screw assembly, a lifting drive rod, and a screw drive rod. The lifting assembly is supported in the deep cavity by the supporting assembly and is provided with a fixed seat, a lifting seat and a rotating seat, the lifting seat can generate displacement above the fixed seat, and the rotating seat can be rotatably supported above the lifting seat. The screwing component is supported above the rotating seat. One end of the lifting driving rod is in transmission connection with the screw rod. One end of the screwing driving rod is in transmission connection with the input end. The screwing driving rod is operated to enable the screwing component and the rotating seat to rotate on the lifting seat together, so that the output end is aligned with the nut to be screwed, and the lifting driving rod is rotated to enable the lifting component to drive the screwing component to be lifted to the height of the nut to be screwed.

Description

Tightening device

Technical Field

The invention relates to the field of assembly, in particular to a screwing device.

Background

The high-pressure compressor rotor is an important component of an aircraft engine, and the quality of bolt connection on the rotor directly influences the rigidity of the aircraft engine rotor, so that the vibration characteristic of the aircraft engine rotor is influenced. The high-pressure compressor rotor is generally formed by assembling a multi-stage disc/disc drum, the disc and the disc are generally in a structural form of interference seam allowance, end face matching and bolt/nut connection, and the screwing quality of the nut affects the inherent characteristics of the rotor and the service life of the bolt, so that the high-pressure compressor rotor is also an important control link in the engine assembling process. In addition, due to the requirement of improving the performance and the efficiency of the high-pressure compressor, the inner cavity of the rotor is more and more compact, and the diameter of a disk center hole and the disk spacing are smaller and smaller while the number of the rotor stages is increased. The connecting bolts/nuts of the high-pressure compressor rotor are distributed in the rotor disc cavity, and the high-pressure compressor rotor is typically characterized in that the diameter of a reference circle where the nuts are located is more than 2.5 times of the diameter of an inlet of a disc center, the distance between discs is small, so that a hand cannot directly stretch into the discs, the mounting position of the nuts cannot be reached visually, and the nut screwing force limitation is very difficult to implement.

Fig. 1 shows a schematic cross-sectional view of a rotor disk cavity of a high-pressure compressor, wherein, when assembling bolts in the rotor disk cavity of the high-pressure compressor, the high-pressure compressor rotor 9 is vertically placed with the front end 9a facing downwards as shown in the figure, and then a tightening device can enter from a central hole at the rear end 9b and be tightened by a nut 90 as shown in the figure. In some models of high-pressure compressors, the minimum diameter of a disk center of a screwing device entering the rotor is less than or equal to phi 110mm, the axial distance from the rear end of the rotor to a nut to be screwed is more than or equal to 450mm, the diameter of a reference circle where the nut is located is more than or equal to phi 300mm, the disk spacing is less than or equal to 35mm, and the screwing torque of the nut is required to be 35 N.m-45 N.m. Because the nut is in the disc cavity depths, the hands can not directly operate and can not reach visually. The inventor has found that the tightening device commonly used at present, such as the traditional "bow" wrench structure, often results in insufficient swing space when the wrench is tightened in order to allow the bow wrench to be placed in the nut position. And the traditional integral belt transmission or gear transmission (double-layer folding gear structure) screwing structural form is adopted, and the strength of the screwing device cannot meet the use requirement due to the limitation of space and transmission ratio.

Therefore, a tightening device is needed, which can satisfy the torque requirement when tightening the nut in the disc cavity and ensure the accuracy and high efficiency of nut installation.

Disclosure of Invention

An object of the present invention is to provide a tightening device that enables efficient and accurate installation of a nut in a deep cavity.

To achieve the foregoing object, a tightening device for tightening a nut in a deep cavity includes:

a support assembly;

the lifting assembly is supported in the deep cavity by the supporting assembly and is provided with a fixed seat, a lifting seat and a rotating seat, the lower end of the fixed seat is connected with the supporting assembly, the upper end of the fixed seat is provided with a screw hole part, the lifting seat is provided with a screw rod part, the screw rod part is in threaded connection with the screw hole part, the screw rod part is rotated to enable the lifting seat to generate displacement above the fixed seat, and the rotating seat is rotatably supported above the lifting seat;

the screwing assembly is supported above the rotating seat and is provided with an input end and an output end, and the output end outputs the torque input by the input end;

one end of the lifting driving rod is in transmission connection with the screw rod;

a screwing driving rod, one end of which is in transmission connection with the input end, and the driving rod is screwed to enable the input end to input torque;

the screwing driving rod is operated to enable the screwing component and the rotating seat to rotate on the lifting seat together, so that the output end is aligned to the nut to be screwed, and the lifting driving rod is rotated to enable the lifting component to drive the screwing component to be lifted to the height of the nut to be screwed.

In one or more embodiments, the deep cavity is a rotor disk cavity, the support assembly includes a support ring including a plurality of circular-arc-shaped petals that form a full ring after being butted, at least two of the petals have support protrusions protruding radially inward of the full ring;

each petal body is provided with a first flange and a second flange which extend towards the radial outer side of the whole ring, the first flange and the second flange are separated by a section in the height direction of the petal body, a clamping groove on the outer side of the whole ring is enclosed after butt joint, and the supporting assembly is fixed in the cavity of the rotor disc through the clamping groove.

In one or more embodiments, the plurality of petal bodies include at least two splicing petal bodies and one insertion petal body, and a gap allowing the insertion petal body to be inserted is formed between the end faces of the free ends of the spliced petal bodies after being butted;

the free end faces are parallel, the outline of the inserting connection clack body corresponds to the outline of the notch, and therefore the inserting connection clack body is allowed to be inserted into the notch from the radial inner side of the whole ring outwards.

In one or more embodiments, the lifting assembly is fixedly connected to the support ledge.

In one or more embodiments, the support assembly further comprises a guide ring closer to the entrance of the rotor disk cavity relative to the support ring, such that the lift assembly is supported on the support ring after being guided into the rotor disk cavity by the guide ring.

In one or more embodiments, the lift assembly further comprises:

the index plate is rotatably connected with the other end of the lifting driving rod, the upper end face of the index plate is provided with a first identification part, and the first identification part identifies the rotating angle of the lifting driving rod; and the number of the first and second groups,

the fixed disc supports the dividing disc at the inlet of the rotor disc cavity, the dividing disc and the fixed disc are rotatably connected,

the screwing driving rod penetrates through the dividing plate and then is in transmission connection with the screwing assembly, and the dividing plate is rotated to drive the screwing driving rod to follow up, so that the screwing assembly and the rotating seat rotate on the lifting seat together.

In one or more embodiments, the upper surface of the fixed disk is provided with a second identification portion corresponding to the circumferential position of the connection nut.

In one or more embodiments, the screw assembly includes:

the first gear box is internally provided with a first gear in a rotatable way;

the second gear box is internally provided with a second gear in a rotatable way;

a connecting part for detachably connecting the first gear box and the second gear box, so that the first gear box and the second gear box are butted and the first gear and the second gear are in mesh transmission;

one of the first gear and the second gear is in transmission connection with the input end, and the other one is in transmission connection with the output end.

In one or more embodiments, the connecting portion is guided in position by mating with the first and second gear boxes ramps.

In one or more embodiments, the tightening device further includes:

the lifting motor is used for providing power input for the lifting driving rod; and

and the electric wrench is used for providing torque input for the screwing driving rod.

The gain effect of the invention is that: through this screwing up device, can realize screwing the nut in the deep cavity, owing to set up the subassembly of screwing of circumferential direction and the lifting unit of liftable setting simultaneously for this subassembly of screwing up can carry out adjustment pertinence ground according to the different positions of nut spare in the deep cavity, thereby realizes the promotion to nut spare pretension accuracy in the deep cavity.

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 rotor disk cavity;

FIG. 2 illustrates a perspective view of one embodiment of a tightening device;

FIG. 3 illustrates a schematic view of one embodiment of a lift assembly;

FIG. 4 is a schematic view of the lift assembly from another angle;

FIG. 5 schematically illustrates an exploded cross-sectional view of one embodiment of a lift assembly;

FIG. 6 illustrates a perspective view of one embodiment of a lift drive rod;

FIG. 7 illustrates a perspective view of one embodiment of a support ring;

FIG. 8 shows a partially enlarged schematic view of the upper half of the lifting assembly;

FIG. 9 shows an enlarged partial schematic view of the screw assembly;

FIG. 10 is a cross-sectional schematic view of the screw assembly.

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.

Referring to fig. 2, a tightening device for tightening nuts in a deep cavity is shown. The tightening device includes: support assembly 1, lifting assembly 2, screw assembly 3, lifting drive rod 4 and screw drive rod 5.

Wherein the support member 1 can be fixed in the deep cavity, thereby providing a support foundation. The lifting assembly 2 is supported in the deep cavity by the support assembly 1. Fig. 3 is a schematic view showing one embodiment of the lifting assembly, and fig. 4 is a schematic view of the lifting assembly from another angle, wherein the lifting assembly comprises a fixed base 21, a lifting base 22 and a rotating base 23. Wherein the lower extreme of fixing base 21 is connected with supporting component 1 to realize supporting component 1 to fixing base 21's support. The upper end of the fixed seat 21 has a screw hole portion, and the lifting seat 22 has a screw member therein, the screw member being in screw-fit connection with the screw hole portion, so that the lifting seat 22 can be displaced above the fixed seat 21 when the screw member 221 is rotated. Specifically, as shown in fig. 5, which schematically illustrates a cross-sectional view of an embodiment of the lifting assembly, wherein the screw member 221 is cooperatively connected with the screw hole portion 211, the screw member 221 is rotated to increase or decrease the distance between the lifting seat 22 and the fixing seat 21. In one embodiment, the screw member 221 is provided in 3 pieces circumferentially arranged along the center of the fixing base 21.

The rotary base 23 is rotatably supported above the lifting base 22, and specifically, as shown in fig. 5, the rotary base 23 is connected to the lifting base 22 through a plurality of bearings 220.

The screwing assembly 3 is supported above the rotary base 23 and is fixedly connected with the rotary base 23, so that the screwing assembly 3 can follow the rotary base 23 when the rotary base 23 rotates around the rotation center. The screw element 3 has an input end 3a and an output end 3b, the output end 3b being able to output the torque input by the input end 3 a.

One end of the lifting driving rod 4 is in transmission connection with the screw rod piece 221, specifically, as shown in the embodiment shown in fig. 5, the lifting assembly 2 has a spindle 24 therein, one end of the lifting driving rod 4 is in transmission connection with the spindle 24, and the spindle 24 is in transmission connection with the screw rod piece 221 through a gear 25, so that when the lifting driving rod 4 is rotated, the spindle 24 and the gear 25 can drive the screw rod piece 221 to rotate, thereby realizing the lifting of the lifting seat 22 above the fixed seat 21. In some other embodiments different from those shown, the lift driving rod and the screw rod member may be directly connected in a transmission manner.

One end of the screwing driving rod 5 is in transmission connection with the input end 3a of the screwing component 3, when the screwing driving rod 5 is screwed, the input end 3a of the screwing component 3 can be enabled to input torque, and therefore torque for screwing the nut is output at the output end 3 b. In one embodiment, one end of the screw driving rod 5 is drivingly connected to the input end 3a of the screw assembly 3 through a sleeve.

Figure 6 illustrates a perspective view of one embodiment of the lift drive rod wherein the end 42 of the lift drive rod 4 may be a hex head as shown to enable a drive connection with a hex socket at the upper end of the mandrel 24.

During the use, the operation is twisted actuating lever 5 and is twisted subassembly and roating seat and rotate together on the lift seat to the output that makes to twist subassembly 3 aims at treating the screw nut, again through rotating lift actuating lever 4 afterwards so that lift subassembly 2 drives to twist subassembly 3 and promotes to treating the height of screwing the nut, and then realizes further screwing up the screw nut.

Through this screwing up device, can realize screwing the nut in the deep cavity, owing to set up the subassembly of screwing of circumferential direction and the lifting unit of liftable setting simultaneously for this subassembly of screwing up can carry out adjustment pertinence ground according to the different positions of nut spare in the deep cavity, thereby realizes the promotion to nut spare pretension accuracy in the deep cavity.

Although one embodiment of the present tightening device is described above, in other embodiments of the present tightening device, the tightening device may have more details than the above-described embodiments in many respects, and at least some of these details may vary widely. At least some of these details and variations are described below in several embodiments.

In one embodiment of the tightening device, the tightening device is for tightening a nut 90 in a rotor disk cavity as shown in fig. 1. The support assembly 1 includes a support ring 11 as shown in fig. 7, the support ring 11 includes a plurality of arc-shaped petals 110, and the petals 110 may be two-by-two butted to form a whole ring as shown in fig. 7. The flap body 110 has a support protrusion 1100 protruding radially inward of the entire ring. In particular, a support protrusion 1100 may be provided on each petal 110 as shown to support the lift assembly 2 after docking. In other embodiments different from those shown in the drawings, the supporting protrusions 1100 may be disposed on at least two of the plurality of petals 110, and the two supporting protrusions 1100 may also be used to effectively support the lifting assembly 2.

Each petal body 110 has a first flange 1101 and a second flange 1102 extending radially outward of the whole ring, and the first flange 1101 and the second flange 1102 are spaced apart by a distance in the height direction a of the petal body 110. The butted first flange 1101 and the butted second flange 1102 enclose a clamping groove 111 outside the whole ring. The support ring 11 can be fixed in the rotor disc cavity by means of a snap-fit, for example, by means of a bayonet groove 111.

In one embodiment of the tightening device, in one embodiment of the support ring, the number of the petal bodies 110 is three as shown in the figure, and the support ring comprises two splicing petal bodies 110a and one insertion petal body 110b, in a splicing state, a parallel gap is formed between the free end faces of the two splicing petal bodies 110a as shown in the figure, meanwhile, the outline of the insertion petal body 110b corresponds to the outline of the gap, and because two side edges of the gap are parallel gaps, the insertion petal body 110b can be inserted into the gap from the inside of the ring formed by the two splicing petal bodies 110 a. So set up for when the support ring 11 assembles in narrow and small airtight space such as intraductal, intracavity, can be earlier with two concatenation flap bodies 110a respectively fixed mounting earlier to form the breach, stretch into the grafting flap body 110b to the cavity in, and insert into breach 100 under the guide of free end terminal surface from the inboard, in order to accomplish the installation to the whole ring in narrow and small airtight space. In the foregoing embodiment, the number of the petal bodies 110 is three to optimize the number of parts, however, the number of the petal bodies 110 may be other numbers, for example, the number of the petal bodies 110 may be more than three, for example, four. In the embodiment that the lamella body quantity is four, including three concatenation lamella bodies and an grafting lamella body can be three concatenation lamella bodies and form the breach that has two parallel sides after the equipment to allow the grafting lamella body to insert from inboard outwards, form the whole ring. The embodiment of lamella body quantity for other quantity is similar with aforementioned, can include a plurality of concatenation lamella bodies and an grafting lamella body, and the concatenation lamella body of a plurality of quantities forms the breach that has two parallel sides after the equipment to allow the inside outside insertion of last grafting lamella body.

In one embodiment of the tightening apparatus, the lifting assembly 2 is fixedly connected to the supporting protrusion 1100 by a fastener such as a bolt, for example, a hole through which a bolt can pass is provided at the lower end of the supporting protrusion 110 and the lifting assembly 2, respectively.

With continued reference to fig. 2, in an embodiment of the tightening device, the support assembly 1 further includes a guide ring 12, and the guide ring 12 is disposed at a position closer to the entrance of the rotor disk cavity relative to the support ring 11, so that the lifting assembly 2 is supported on the support ring 11 after being guided into the rotor disk cavity by the guide ring 12. In one embodiment, the guide ring 12 may be in the form of a split ring structure as the support ring 11 shown in fig. 7, which is not described in detail herein.

Fig. 8 shows a partially enlarged schematic view of the upper half of the lifting assembly 2, wherein the lifting assembly further includes an indexing plate 26 and a fixed plate 27, wherein the indexing plate 26 is in transmission connection with the other end, i.e., the upper end, of the lifting drive rod 4, and a first identification part 261 may be disposed on the upper end of the indexing plate 26, and the first identification part 261 identifies the rotation angle of the lifting drive rod 4. The fixed disk 27 supports the indexing disk 26 at the rotor disk chamber inlet, and the indexing disk 26 is rotatably connected to the fixed disk 27. The screwing driving rod 5 can be connected with the screwing component 3 in a transmission mode after penetrating through the dividing plate 26, the dividing plate 26 can be rotated to drive the screwing driving rod 5 to follow up, so that the screwing component 3 and the rotating seat 23 are driven to rotate on the lifting seat 22 together, and therefore when screwing is carried out, the output end 3b of the screwing component 3 can be aligned to a nut to be screwed through operation of the dividing plate 26.

A second identification 271 is provided on the upper surface of the fixed disk 27 in correspondence with the circumferential position of the coupling nut in the rotor disk cavity, so that when the indexing disk 26 is rotated, the output 3b of the screwing assembly 3 can be quickly aligned with the nut to be mounted by aligning the position of the screwing driving rod 5 with the second identification 271 in the corresponding position.

Fig. 9 shows a partially enlarged schematic view of the screw assembly, and fig. 10 is a schematic cross-sectional view of the screw assembly, wherein the screw assembly 3 includes a first gear box 31 and a second gear box 32, a first gear 311 is rotatably disposed inside the first gear box 31, and a second gear 321 is rotatably disposed inside the second gear box 32. The first gear box 31 and the second gear box 32 are detachably connected through a connecting portion 33, the connecting portion 33 enables the first gear box 31 and the second gear box 32 to be in butt joint, and the first gear 311 and the second gear 321 are in meshing transmission, wherein the first gear 311 is in transmission connection with the input end 3a of the screwing component 3, and the second gear 321 is in transmission connection with the output end 3b of the screwing component 3, so that when a torque is input at the input end 3a, the output end 3b can output the torque. In an embodiment different from the previous one, the first gear 311 is in driving connection with the output end 3b of the screwing assembly 3 and the second gear 321 is in driving connection with the input end 3a of the screwing assembly 3.

With continued reference to fig. 10, in one embodiment of the tightening device, the connecting portion 33 is guided and positioned with the first gear box 31 and the second gear box 32 by a bevel fit. Specifically, in one embodiment, the tightening device further includes a first operating rod 38 and a second operating rod 39, the first operating rod 38 is fittingly connected to the first gear box 31, so that when the first operating rod 38 is moved, the first gear box 31 follows the first operating rod 38, and similarly, the second operating rod 39 and the second gear box 32 have the same fitting connection relationship, when the tightening device is assembled, by moving the first operating rod 38 and the second operating rod 39, the screwing assembly 3 can be assembled in a deep cavity, and meanwhile, by the inclined surface fitting positioning, the accuracy of assembling the screwing assembly 3 can be further ensured.

In one embodiment of the tightening device, the tightening device further comprises a lifting motor 6 and an electric wrench 7, wherein the lifting motor 6 provides power input for the lifting driving rod 4, the electric wrench 7 provides torque input for the screwing driving rod 5, accuracy of the lifting height and the torque input value can be achieved through the lifting motor 6 and the electric wrench 7, and tightening quality is improved. In one embodiment, the tightening device may further comprise a control system for controlling the amount of power/torque output by the lift motor 6 and/or the power wrench 7. In some embodiments different from those shown, the tightening device may be operated manually without the lifting motor 6 or the electric wrench 7.

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 tightening device for tightening a nut in a deep cavity, the tightening device comprising:

a support assembly;

2. The tightening apparatus according to claim 1, wherein the deep cavity is a rotor disc cavity, the support assembly includes a support ring including a plurality of arcuate lobes that abut to form a full ring, at least two of the lobes having support protrusions that project radially inward of the full ring;

3. The tightening device according to claim 2, wherein the plurality of the petal bodies include at least two splicing petal bodies and one insertion petal body, and a gap allowing the insertion petal body to be inserted is formed between the butted free end faces of the splicing petal bodies;

4. The tightening apparatus according to claim 2, wherein the lifting assembly is fixedly connected to the support boss.

5. The tightening apparatus according to claim 4, wherein the support assembly further includes a guide ring that is closer to the entrance of the rotor disk cavity relative to the support ring such that the lift assembly is supported on the support ring after being guided by the guide ring into the rotor disk cavity.

6. The tightening apparatus of claim 2, wherein the lifting assembly further comprises:

7. The tightening apparatus according to claim 6, wherein the upper surface of the fixing plate is provided with a second identification portion at a position corresponding to a circumferential direction of the coupling nut.

8. The tightening apparatus of claim 1, wherein the screw assembly comprises:

the first gear box is internally provided with a first gear in a rotatable way;

9. The tightening apparatus according to claim 8, wherein the connecting portion is guided to be positioned by being engaged with the first gear box and the second gear box inclined surfaces.

10. The tightening apparatus according to claim 1, further comprising: