CN114074300A

CN114074300A - Balance tool

Info

Publication number: CN114074300A
Application number: CN202010845261.9A
Authority: CN
Inventors: 沈宇擘; 张潇; 任家海; 何玉峰
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2022-02-22

Abstract

An object of the present invention is to provide a balancing tool, which can balance turbine disks having different diameters and structures, and can eliminate the unbalance amount of the balancing tool itself. For realizing the balanced frock of aforementioned one purpose, including the disk body, the disk body has the second side that is used for connecting the first side of being balanced object and is used for connecting balancing equipment, is provided with a plurality of centering posts and a plurality of fixed columns on first side, is supported and the aligning back by the centering post by balanced object, is fixed in the first side top of disk body through the fixed column. The disk body has the cooperation portion that sets up along the periphery, is provided with at least one counter weight unit on the cooperation portion, and the counter weight unit is mobile along the periphery of disk body, through adjusting the position of counter weight unit on the disk body periphery to the self unbalance amount of eliminating balance frock.

Description

Balance tool

Technical Field

The invention relates to a balance tool.

Background

The prior aero-engine generally adopts a single-rotor, double-rotor or three-rotor structure, and any structure comprises a plurality of internal structures such as discs, drum barrels, disc drums, cone barrels, rotor assemblies and the like with different sizes. In order to reduce the vibration probability of the aircraft engine, the components need to be balanced and the residual unbalance amount needs to be effectively controlled in the assembly process of the aircraft engine, and the balance precision grade is generally required to be between G2 and G6.4. Meanwhile, in order to avoid generating a large balance measurement error, a balance fixture for supporting and balancing the engine components needs to balance and control the residual unbalance amount of the balance fixture, and the residual unbalance amount of the balance fixture is generally required to be at least within one fifth of the balanced object. At present, a part is generally matched with a balance clamp or different adapters are replaced on the balance clamp to realize the balance of different parts, if the number of the parts is large or the sizes of the parts are different, the number of the matched clamps is also large, and the clamp debugging workload before the balance is large, so that the clamp cost is high and the balance working efficiency is low.

The utility model application with publication number CN206216558U discloses a balancing fixture, which realizes the balance of a rotor disc by establishing three points on the end surface for compressing and setting the cylindrical surface to be a three-cylinder centering manner, and is shown in fig. 1 as a schematic diagram, which comprises a plurality of supporting columns 91, a plurality of fixed positioning columns 92 and adjustable positioning columns 93. The plurality of fixed positioning columns 92 and the adjustable positioning columns 93 are used to define a positioning surface together for positioning the object to be balanced, and the plurality of supporting columns 91 are used to support the object to be balanced together. The unbalance of the tool itself is eliminated by the balance weight screws 94 on the side of the balance disc.

Fig. 2 shows a schematic view of a low-pressure turbine rotor, which is composed of multiple stages of disks 95, the diameters of the disks 95 are different, and the number of connecting holes at the connecting position 96 of adjacent turbine disks cannot be divided by 3. According to the principle that three points establish a plane, the center of a circle can be determined by only designing three positioning cylinders in a general disc static balance tool, and the turbine disc and a rotating shaft of a balance machine are coaxial. Because the mode that can't be divided the hole equipartition by 3 is adopted, set for three roughly the equipartition location support column support turbine dish because of the inhomogeneous of pillar distribution, can cause the uneven amount of introducing of balanced frock self because of the inequality of mass distribution. The unbalance of the tool can be eliminated by removing materials or adding a balance weight, and the mode of adopting a balance weight screw to eliminate the unbalance of the tool is difficult to operate due to the fact that the distribution positions of the centering cylinder and the pressing cylinder of each stage of disc are different due to different connecting radiuses of the stages of discs.

Therefore, a balance tool is needed, which can balance turbine disks with different diameters and structures and can eliminate the self unbalance of the balance tool.

Disclosure of Invention

An object of the present invention is to provide a balancing tool, which can balance turbine disks having different diameters and structures, and can eliminate the unbalance amount of the balancing tool itself.

The balancing tool comprises a disc body, wherein the disc body is provided with a first side used for being connected with a balanced object and a second side used for being connected with balancing equipment, a plurality of centering columns and a plurality of fixing columns are arranged on the first side, and the balanced object is supported by the centering columns, aligned and fixed above the first side of the disc body through the fixing columns;

the disk body has the cooperation portion that sets up along the periphery be provided with at least one counter weight unit on the cooperation portion, the counter weight unit is followed the periphery of disk body is mobile, through adjusting the counter weight unit is in the position in the disk body periphery is in order to eliminate the self unbalance amount of balanced frock.

In one or more embodiments, the engaging portion is a circular rail provided along an outer periphery of the tray body, and the counterweight unit has a groove portion therein to be engaged with the circular rail.

In one or more embodiments, a ring groove is opened in the disk body, and the ring groove is opened on the inner periphery of the ring rail.

In one or more embodiments, a stopper is provided in the counterweight unit, and the stopper restricts movement of the counterweight unit along the outer periphery of the tray body at a specified position.

In one or more embodiments, a threaded hole is formed in the counterweight unit, and the limiting member is a limiting bolt connected to the threaded hole;

wherein the movement of the counterweight unit along the periphery of the plate body is limited at a specified position by screwing the limit bolt.

In one or more embodiments, a clamping block is arranged between the limiting bolt and the ring rail, and the clamping block is provided with a first surface opposite to the limiting bolt and a second surface opposite to the ring rail;

the first surface is a plane, and the second surface is an arc surface conformal with the periphery of the ring rail.

In one or more embodiments, the weight unit is provided in plurality on the outer circumference of the tray body.

In one or more embodiments, the tray body has a first connection hole on the first side, and the lower end of the centering column is connected with the first connection hole spigot through a connection bolt after being matched and positioned with the first connection hole spigot.

In one or more embodiments, a plurality of groups of centering columns are arranged on the first side, each group of centering columns includes three centering columns, correspondingly, the first connecting holes are opened in the first side, and each group of first connecting holes includes three first connecting holes uniformly distributed along the circumferential direction of the tray body.

In one or more embodiments, the tray body is provided with a second connecting hole on the first side, the second connecting hole is a threaded hole, and the lower end of the fixing column is provided with a threaded part which can be in threaded fit connection with the threaded hole;

the second connecting holes are uniformly distributed along the circumferential direction of the tray body, and the fixing columns are uniformly distributed along the circumferential direction of the tray body.

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

through setting up a plurality of mobilizable counter weight units in the periphery of disk body of edge for this balanced frock can realize the self-balancing after being connected frock itself and frock and balanced object through adjusting the position of counter weight unit in circumference. And particularly, good self-balance can be realized for objects with asymmetric structures and irregular shapes.

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 balancing fixture;

FIG. 2 illustrates a schematic view of a low pressure turbine rotor;

FIG. 3 is a perspective view of one embodiment of the balance tool;

fig. 4 is a schematic perspective view of the balance tool and the object to be balanced in a connected state;

FIG. 5 illustrates a partially enlarged schematic view of one embodiment of a balancing fixture;

FIG. 6 illustrates an enlarged, top view, partial schematic view of one embodiment of a balancing fixture;

fig. 7 shows a schematic view of the centering column in a state of being connected to the disk body.

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.

In order to solve one or more problems in the prior art, the invention provides a balance tool. Fig. 3 is a perspective view showing an embodiment of the balance tool, and fig. 4 is a perspective view showing a state where the balance tool is connected to a target to be balanced.

The balancing tool comprises a disc body 1 with a first side 11 for connecting the object 8 to be balanced and a second side 12 for connecting a balancing device, such as a balancing machine. A plurality of centering studs 13 and a plurality of fixing studs 14 are provided on the first side 11. The balanced object 8 is supported and centered by the centering column 13, and particularly, the centering process can be determined by determining the center by three points in the traditional centering assembly process. After the balance object 8 is supported by the centering column 13 and the centering is completed, the balance object is fixed above the first side 11 by a plurality of fixing columns 14.

When the shape of the supported balanced object 8 is irregular, and/or the distribution is not uniform after the three-point centering support is structurally performed, and/or the tool itself has an unbalance margin, the tool itself and/or the connected tool and the balanced object need to be further self-balanced to eliminate the unbalance amount of the tool itself.

This balance fixture's disk body 1 has the cooperation portion 15 that sets up along the periphery, is provided with at least one counter weight unit 2 on cooperation portion 15, and counter weight unit 2 movably sets up on cooperation portion 15 to make counter weight unit 2 movable along the periphery of disk body 1. The position of the counterweight unit 2 on the periphery of the disc body 1 is adjusted to eliminate the self unbalance of the balance tool.

Through setting up a plurality of mobilizable counter weight units 2 in the periphery of disk body 1 for this balanced frock can realize the self-balancing after being connected frock itself and frock and balanced object 8 through adjusting counter weight unit 2 in the position of circumference. And particularly, good self-balance can be realized for objects with asymmetric structures and irregular shapes.

While one embodiment of a balancing tool is described above, in other embodiments of a balancing tool, the balancing tool may have more details than the embodiments described above 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.

As shown in fig. 5, a partial enlarged view of an embodiment of the balancing tool, in the embodiment of the balancing tool, the fitting portion 15 is a circular rail disposed along the outer periphery of the disc body 1, and the counterweight unit 2 has a groove portion 20 therein, which is fitted to the circular rail. The counterweight unit 2 is fittingly connected with the ring rail by a groove portion 20, and the groove portion 20 allows the counterweight unit to be movable along the outer periphery of the tray body 1.

In other embodiments different from the illustrated embodiments, there may be many suitable modifications or changes in the structure of the fitting portion 15, but not limited to this, for example, in one embodiment, the fitting portion may be a ring groove, and the counterweight unit 2 is connected with the ring groove by a convex portion.

Fig. 6 is a partially enlarged schematic plan view of an embodiment of a balancing tool, in which a limiting member 21 is provided in the counterweight unit 2, and the limiting member limits movement of the counterweight unit 2 along the outer periphery of the disc body 1 at a specified position. If when the counterweight unit moves to a position, the position can enable the counterweight tool to be in a balance state, the position is the specified position, the counterweight unit is limited by the limiting part 21 to limit the movement of the counterweight unit, the counterweight tool can be guaranteed to be in the balance state, and the accuracy of a balance test is further guaranteed.

In one embodiment of the balance tool, a threaded hole is formed in the counterweight unit 2, and the limiting member 21 is a limiting bolt connected to the threaded hole. The movement of the counterweight unit 2 along the outer periphery of the tray body 1 is restricted at a specified position by screwing the limit bolt, and the movement of the counterweight unit 2 along the outer periphery of the tray body 1 is allowed by unscrewing the limit bolt.

In other embodiments different from the illustrated embodiments, there may be many suitable modifications or variations in the structure of the limiting member 21, but not limited to this, for example, in one embodiment, the limiting member 21 may be a snap, and the movement of the weight unit 2 is limited by snapping and fixing the weight unit at a designated position.

In one embodiment of the balance tool, a clamping block 22 is arranged between the limit bolt of the limit piece 21 and the ring rail, and the clamping block 22 is provided with a first surface 22a opposite to the limit bolt and a second surface 22b opposite to the ring rail. The first surface 22a is a plane, and the second surface 22b is an arc surface conformal to the periphery of the circular rail. Thereby when having guaranteed locating part 21's limiting displacement, increased with the ring rail between the contact surface for locating part 21's limiting displacement is more firm, is difficult for sliding by spacing counter weight unit 2.

In one embodiment of the balancing tool, the plurality of counterweight units 2 are arranged on the periphery of the disc body 1, so that the self-balancing of the balancing tool is realized by adjusting the relative positions of the plurality of counterweight units 2. In other embodiments, the counterweight unit 2 may be provided as only one, and the position of the counterweight unit and the positions of the plurality of fixing columns 14 on the first side 11 are adjusted to achieve self-balancing of the balancing tool.

Referring to fig. 7, which illustrates a schematic view of a state that the centering column 13 is connected with the tray body 1, in one embodiment of the balancing tool, the tray body 1 has a first connection hole 18 on the first side 11, and after the lower end of the centering column 13 is positioned in the first connection hole 18, the lower end is connected with the first connection hole through a connection bolt.

In an embodiment of the balance tool, a plurality of groups of centering columns 13 are disposed on the first side 11, each group of centering columns includes three centering columns 13, correspondingly, the first connecting holes 18 are a plurality of groups opened in the first side 11, and each group of first connecting holes 18 includes three first connecting holes 18 uniformly distributed along the circumferential direction of the tray body 1. Specifically, the plurality of sets of first connection holes 18 may be respectively opened at different radial positions of the tray body 1, so that objects having different radial sizes can be balanced when the centering pillars 13 are connected to the first connection holes at different radial positions. Meanwhile, three centering columns 13 are included in each set of centering columns to realize three-point centering support for the balanced object. The uniform distribution here means that, for each group of first connection holes 18, the circumferential distance between two adjacent first connection holes 18 is the same.

Referring to fig. 3 and 5, in an embodiment of the balancing fixture, the tray body 1 has a second connecting hole 19 on the first side 11, the second connecting hole 19 is a threaded hole, and the lower end of the fixing column 14 has a threaded portion 141 capable of being in threaded fit connection with the threaded hole. Wherein, the second connecting hole 19 is opened along the circumference equipartition of disk body 1, and fixed column 14 is a plurality ofly along the circumference equipartition setting of disk body 1.

Through the balance tool in one or more of the above embodiments, objects with different configurations and shapes can be balanced.

As in one exemplary embodiment, the object 8 to be balanced is a turbine disk of a multi-stage turbine disk of an aircraft engine of the type in which adjacent turbine disks are connected by 49 connecting holes. Since 49 connecting holes cannot be evenly divided by 3, an additional unbalance amount is generated when being fixed on the balancing tool. Through adjusting the circumferential positions of the plurality of balance weight units 2 on the periphery of the disc body 1, further self-balancing of the balancing tool and the balanced object 8 supported above the balancing tool is realized, and unbalance generated by the connecting holes is eliminated.

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. The utility model provides a balanced frock, includes the disk body, the disk body has the second side that is used for connecting the first side of being balanced object and is used for connecting balancing equipment be provided with a plurality of centering posts and a plurality of fixed columns on the first side, by balanced object by after centering post supports and the aligning, be fixed in through the fixed column the disk body first side top, its characterized in that:

2. The balance tool of claim 1, wherein the matching part is a circular rail arranged along the periphery of the disc body, and the counterweight unit is provided with a groove part matched with the circular rail.

3. The balance tool of claim 2, wherein the plate body is provided with a ring groove therein, and the ring groove is provided on an inner periphery of the ring rail.

4. The balance tool of claim 2, wherein a limiting member is arranged in the counterweight unit, and the limiting member limits the movement of the counterweight unit along the periphery of the disc body at a specified position.

5. The balance tool of claim 4, wherein a threaded hole is formed in the counterweight unit, and the limiting member is a limiting bolt connected to the threaded hole;

6. The balance tool of claim 5, wherein a clamping block is provided between the limit bolt and the circular rail, the clamping block having a first face opposite to the limit bolt and a second face opposite to the circular rail;

7. The balance tool of claim 1, wherein the plurality of counterweight units are arranged on the periphery of the disc body.

8. The balance tool of claim 1, wherein the tray body has a first connection hole on the first side, and the lower end of the centering column is connected with the first connection hole spigot through a connection bolt after being matched and positioned with the first connection hole spigot.

9. The balance tool of claim 8, wherein a plurality of groups of centering columns are arranged on the first side, each group of centering columns comprises three centering columns, correspondingly, the first connecting holes are arranged in the first side in a plurality of groups, and each group of first connecting holes comprises three first connecting holes uniformly distributed along the circumferential direction of the disc body.

10. The balance tool of claim 1, wherein the tray body is provided with a second connecting hole on the first side, the second connecting hole is a threaded hole, and the lower end of the fixing column is provided with a threaded part which can be in threaded fit connection with the threaded hole;