CN108956068A - A kind of rubbing test device turning stator - Google Patents
A kind of rubbing test device turning stator Download PDFInfo
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- CN108956068A CN108956068A CN201810517852.6A CN201810517852A CN108956068A CN 108956068 A CN108956068 A CN 108956068A CN 201810517852 A CN201810517852 A CN 201810517852A CN 108956068 A CN108956068 A CN 108956068A
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- cam
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- block
- leaf dish
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The present invention relates to a kind of rubbing test devices for turning stator comprising block, three-dimensional load cell, touches the supporting mechanism that rubs, leaf dish balance mechanism, spindle drive and gap adjusting mechanism at cabinet.The device is adjusted by gap adjusting mechanism turns stator gap, it realizes and different touches intrusion volume of rubbing, using leaf dish balance mechanism in rotor high speed rotation, mass eccentricity is generated by Electromagnetic Control, generate burst amount of unbalance, it touches the uneven generation of rotor rotation to rub, the material of casing coating in the supporting mechanism that rubs can be also touched by changing, realization touches the test that rubs to different casing coating materials.Different intrusion volumes, intrusion rate, the different parameters such as equilibrium state and different coating material, coating layer thickness are analyzed by the experimental provision to crash the affecting laws of power of rubbing, and existing theoretical model is modified based on test data.
Description
Technical field
The present invention relates to a kind of rubbing test devices for turning stator, belong to blade fault experimental simulation device technical field.
Background technique
For rotating machinery, turning stator and touch to rub is a kind of failure that is common and easily causing mechanical failure, and is made
Touch rub special case to turn stator: touching between blade and casing is rubbed, since blade tangential velocity is high, collision energy is big, more
It is also easy to produce bending deformation, so as to cause blade local damage, such as blade arrisdefect and blade root high cycle fatigue phenomenon of the failure.
The existing device that rubs that touches is mostly that single pendulum touches the device that rubs, and is not inconsistent with the situation of rubbing of touching of reality；Have by adjusting screw number
Purpose variation, may be implemented a little to touch rub, partial rub and complete cycle are touched and are rubbed, the true situation of rubbing of touching cannot be simulated well；These
Experiment be unable to accurately determine intrusion volume number；Three directions can not accurately be tested out touches power size of rubbing；It can not
Uneven the touching for generation of simulation burst is rubbed；It can not test under different coating material and touch the situation of rubbing, need a kind of more true
Simulation turns the experimental provision that stator touches the process of rubbing.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, the present invention provides a kind of rubbing test device for turning stator, solves existing
There is the deficiency of rub experiment platform, more true simulation turns the experimental provision that stator touches the process of rubbing, can be used for analogue measurement leaf dish
Touching when rubbing is touched in different rotating speeds, different intrusion volume, the uneven and different casing coatings of burst to rub power size and Orientation, leaf
The data such as piece dynamic stress.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
A kind of rubbing test device turning stator comprising block, cabinet, three-dimensional load cell, displacement characteristic sensing
Device, foil gauge touch the supporting mechanism that rubs, leaf dish balance mechanism, spindle drive and gap adjusting mechanism, described to touch the support machine that rubs
Structure is fixed on the side above the block, described to touch the supporting mechanism that rubs equipped with support ring as stator, the spindle drive machine
Structure is fixed on the top of the cabinet, and the spindle drive connects and provides power for the leaf dish balance mechanism, described
The leaf dish of leaf dish balance mechanism is correspondingly arranged as rotor, the stator with rotor, and the inner sidewall of the support ring is equipped with machine
Casket, the three-dimensional load cell and displacement characteristic sensor are attached on the casing, and the foil gauge is attached to the leaf dish
On blade；The gap adjusting mechanism is fixed on the other side above the block, and the gap adjusting mechanism is for adjusting institute
The clearance distance of leaf dish in support ring and the leaf dish balance mechanism is stated, the cabinet is placed in above block, described to touch the support that rubs
Mechanism, leaf dish balance mechanism and gap adjusting mechanism are placed in box house.
Wherein, displacement characteristic sensor displacement sensor or acceleration transducer can be used it is not limited to both,
As long as obtaining the mobile sensor in position for measuring.
Rubbing test device as described above, it is preferable that the supporting mechanism that rubs that touches includes column, support ring housing, machine
Casket and support ring, the lower end of the column are fixed on the block, and the support ring housing and support ring are fixed on column
Upper end is equipped with trunnion, rotates the support ring around the column, the branch between the support ring housing and the column
Pushing out ring is cavity ring, and the casing is fixed on the inner wall of the cavity ring.
Rubbing test device as described above, it is preferable that the length of the casing is 90 ° of arc sizes of support ring, institute
It states casing and is coated with casing coating on one side towards turntable, the setting position of the casing is straight where making the line at casing both ends
Line is parallel to each other with support ring center and the straight line where the line at column center.
Rubbing test device as described above, it is preferable that the casing coating connects the three-dimensional load cell, described
Three-dimensional load cell can be arranged in any position on casing.
Rubbing test device as described above, it is preferable that the spindle drive include gas motor, diaphragm coupling,
Main shaft, angular contact ball bearing, bearing block and bearing (ball) cover, the gas motor connect the diaphragm coupling, the diaphragm shaft coupling
Device connects the main shaft, and there are two angular contact ball bearing and bearing (ball) cover, the angular contact ball bearing cards for socket on the main shaft
It connects in bearing block, the bearing (ball) cover is fixed on bearing block, and the bearing block is fixed on the cabinet；The leaf dish balance
Mechanism includes leaf dish, connection flange and blade, and the outer edge of the leaf dish is equipped with blade, and the main the tip of the axis passes through attached method
Orchid is fixedly connected with the leaf dish, and the leaf dish and blade are placed in the cavity ring of the support ring.
Further, the gas motor is vane air motor, piston type pneumatic motor, gear type gas motor and swing type gas
Any one of motor, preferably vane air motor.Vane air motor can meet the adjusting variation of revolving speed and revolving speed, and turn
Speed requires height, can simulate true blade-casing rub impact phenomena.
Main shaft in the present invention only plays transmitting power when blade and casing are not touched and rubbed, and being primarily subjected to torque is
It for transmission shaft, touches and had not only supported driving parts when rubbing but also transmitted power, while bearing torque and moment of flexure, be considered as shaft.Main shaft
It is designed using solid d-axis, in order to facilitate the fixation of axis upper bearing (metal) and shaft end shaft coupling, connection flange, main shaft is along axial section shape
Shape is designed as multi-diameter shaft.
The overhanging diameter of axle of main shaft first segment should connect with gas motor output end and match with shaft coupling, and main the tip of the axis passes through flange
It is connect with leaf dish.
Rubbing test device as described above, it is preferable that 4 unbalanced constructions are symmetrically arranged with below the leaf dish,
Each unbalanced construction includes that electromagnet, spring, balance mass block and the sliding nail of electromagnetism, the electromagnet are fixed on the leaf
Disk side, adjacent electromagnet is set as cavity on the inside of the leaf dish, is equipped with spring in cavity, the electromagnet is fixedly connected with institute
One end of spring is stated, the other end of the spring is fixedly connected with the sliding nail of the electromagnetism, and the electromagnetism is sliding to be followed closely the balance quality
Block is fixed in the leaf dish, when the solenoid is energized, is attracted in the sliding nail retraction cavity of electromagnetism, makes to balance mass block disengaging leaf
Disk.
Further, it is additionally provided with rotor hexagon bracket in the lower end surface of support ring, receives the balance matter to fall down in leaf dish
Gauge block is equipped with reserved logical window in the center of the block.
Rubbing test device as described above, it is preferable that the gap adjusting mechanism includes Cam feed machine and lead screw
Feed mechanism, the Cam feed machine include cam sliding nail, cam, cam slide, two cam limit blocks, cam limits
Screw, two cam tracks, driving cylinder and cam fixed plate；The cam fixed plate is fixed on the lead screw feed mechanism
Top, two cam tracks are fixed on the top of the cam fixed plate, and the cam slide is slidably fixed described convex
It takes turns on guide rail, the cam is fixed on the cam slide, and the two sides of the cam tracks are respectively equipped with cam limit block,
The side of one cam limit block is equipped with cam limit screw, and the push rod of the driving cylinder passes through another cam limit
Position block, and it is fixedly connected with the cam slide, the driving cylinder driving cam slide moves in cam tracks, described convex
One end of the sliding nail of the fixed cam in the top of wheel, the other end of the sliding nail of the cam connect the support ring.
The sliding nail of cam can be to be equipped on position opposite with the center of column in support ring with the connection of support ring setting
Sliding nail hole, the sliding nail of cam are connect across sliding nail hole with support ring.The center of circle at the center of sliding nail hole and the center of circle of support ring and column
On the same line, movement of the movement of cam with the sliding nail of moving cam drives support ring that position occurs mobile.
The lead screw feed mechanism includes feed screw nut, lead screw guide rails support frame, lead screw, lead screw support base, MLL diaphragm connection
Axis device and stepper motor, the lead screw guide rails support frame are fixed on the block, above the lead screw guide rails support frame in
Centre is fixed with stepper motor, and the stepper motor connects lead screw by MLL diaphragm coupling, and the both ends of the lead screw pass through respectively
Lead screw support base is fixed on the lead screw guide rails support frame, and the feed screw nut, the lead screw spiral shell are equipped among the lead screw
Mother is axially moved as stepper motor drives along lead screw, the fixed cam fixed plate in the top of the feed screw nut.
Further, the lead screw feed mechanism further includes two lead screw linear guides and four straight-line guide rail slide blocks, in institute
The top of lead screw guide rails support frame is stated, the two sides of lead screw are parallel to lead screw and are respectively equipped with the lead screw linear guide, the straight line
There are two guide rail slide block is set in the lead screw linear guide, the straight-line guide rail slide block can slide in lead screw linear guide,
The cam fixed plate is fixed in the top of each straight-line guide rail slide block.
(3) beneficial effect
The beneficial effects of the present invention are:
Experimental provision of the invention realizes different blade rotational speeds by controlling air motor, and control leaf dish is realized different
Invade revolving speed.Adjustment gap adjusting mechanism different touches intrusion volume of rubbing to realize.It is realized in rotation by control leaf dish aequum
Burst imbalance causes rub experiment when impact-rub malfunction.By changing the material of coating, different coating material is touched in realization
Rub test.It can be tested out by sensor and be touched under different intrusion revolving speeds, intrusion volume, rotor unbalance state from different casing coatings
Rub the vibration stress for touching Mo Li and blade of generation.
Compared with prior art the invention has the advantages that
By building model experiment platform, the influence of casing elasticity and abradable coating is considered, using three-dimensional load cell
Measure three directions touches power of rubbing, and analyzes different intrusion volumes, the intrusion parameters such as rate and different coating hardness crash the shadow of power of rubbing
Rule is rung, intrusion volume, gas motor control blade rotational speed etc. can be accurately controlled by cam+lead screw feed mechanism.Pass through reality
Experiment device blade is touched with corresponding one section of circular arc casing and is rubbed, and can preferably be simulated and really be touched situation of rubbing.Reality provided by the invention
Experiment device mainly realizes that turning stator touches rub simulation test and casing coating material two kinds of rub experiment functions of test, is theory analysis
Truer, function more fully experimental provision is provided.
Detailed description of the invention
Fig. 1 is the single unit system structural schematic diagram of one embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the support ring of one embodiment of the present invention；
Fig. 3 is the profilograph of the single unit system structure of one embodiment of the present invention；
Fig. 4 is the balanced structure schematic diagram of uneven regulating system；
Fig. 5 is the structural schematic diagram of Cam feed machine；
Fig. 6 is the structural schematic diagram of lead screw feed mechanism.
[description of symbols]
1: block, 2: column, 3: support ring housing, 4: support ring, 5: casing, 5-1: casing coating, 6: blade, 7: leaf
Disk, 8: connection flange, 9: bearing (ball) cover, 10: angular contact ball bearing, 11: gas motor, 12: diaphragm coupling, 13: main shaft, 14:
Sensor stand, 15: the sliding nail of cam, 16: straight-line guide rail slide block, 17: cam, 18: cam slide, 19: cam limit block,
20: cam limit screw, 21: cam tracks, 22: limited block fixing screws, 23: cam fixed plate, 24: feed screw nut, 25:
Lead screw guide rails support frame, 26: lead screw, 27: lead screw support base, 28:MLL diaphragm coupling, 29: stepper motor, 30: lead screw straight line
Guide rail, 31: cylinder, 32: electromagnet, 33: spring, 34: balance mass block, 35: the sliding nail of electromagnetism, 1-1: cabinet, 1-2: bearing block.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
Embodiment 1
The rubbing test device provided by the invention for turning stator, including it include block, cabinet, three-dimensional load cell,
Displacement characteristic sensor, foil gauge touch the supporting mechanism that rubs, leaf dish balance mechanism, spindle drive and gap adjusting mechanism,
In, the side that the supporting mechanism that rubs is fixed on above block is touched, touches the supporting mechanism that rubs equipped with support ring, support ring is main as stator
Shaft transmission is fixed on the top of cabinet, and spindle drive connects leaf dish balance mechanism, and provides for leaf dish balance mechanism
Power, as rotor, stator is correspondingly arranged the leaf dish of leaf dish balance mechanism with rotor, and rotor is placed in setting, i.e. leaf among stator
Disk is placed in the ring of support ring.The inner sidewall of support ring is equipped with casing, and casing can be bolted on the inside of support ring
On wall, casing is equipped with three-dimensional load cell and displacement characteristic sensor such as displacement sensor or acceleration transducer, three-dimensional
What load cell was used to measure three directions touches power of rubbing, acceleration or displacement sensor, for measuring the speed of leaf dish (casing)
Degree and vibration displacement；Displacement sensor is used to measure the vibration displacement of leaf dish (casing)；Three-dimensional load cell and displacement characteristic
Sensor can be attached to any position of casing, post foil gauge on the blade of leaf dish.Gap adjusting mechanism is fixed on above block
The other side, gap adjusting mechanism is used to adjust the clearance distance of support ring and leaf dish, and cabinet is placed in above block, touches the support that rubs
Mechanism, leaf dish balance mechanism and gap adjusting mechanism are placed in box house.
Specifically, as shown in Figure 1, touching the supporting mechanism that rubs includes column 2, support ring housing 3, casing and support ring 4, column
2 lower end is fixed on block 1, can be fixed by screw, and the upper end of column 2 is fixed with support ring housing 3 and support ring 4, branch
Pushing out ring housing 3 and support ring 4 can be bolted on the upper end of column 2, and trunnion is equipped between support ring housing 3 and column 2,
Support ring 4 can be made to rotate around column, support ring 4 is cavity ring, and casing 5 is fixed on the inner wall of cavity ring.
Preferably, as shown in Fig. 2, the length of casing 5 is that 90 ° of fan-shaped sizes of support ring 4 correspond to the arc-like sheet of arc length, machine
The setting position of casket 5 is the line place of the straight line and 4 center of support ring and 2 center of column where making the line at 5 both ends of casing
Straight line be parallel to each other.Casing is coated with casing coating 5-1, casing coating 5-1 connection three-dimensional force-measuring sensing towards turntable on one side
Device, three-dimensional load cell can be arranged in any position on casing.Three-dimensional load cell can measure three directions of x, y, z
Power can measure to touch to rub and touch the force data that rubs when occurring, the size and Orientation for touching power of rubbing is calculated by computer disposal.It can pass through
Change the material of casing coating 5-1, realization touches the test that rubs to different coating material.Displacement characteristic sensor can be on casing
Any position setting, as long as being attached on casing, can measure casing and touch the data such as the displacement for the generation that rubs.
As shown in figure 3, spindle drive includes gas motor 11, diaphragm coupling 12, main shaft 13, angular contact ball bearing
10, bearing block 1-2 and bearing (ball) cover 9, gas motor 11 connect diaphragm coupling 12, and diaphragm coupling 12 connects 13 gas motor of main shaft
Main shaft on set there are two angular contact ball bearing, a bearing (ball) cover, corner connection are respectively provided on the outside of two angular contact ball bearings
Touching ball bearing is stuck on bearing block, and bearing (ball) cover is fixed on bearing block, is fixed on cabinet 1-1 on bearing block 1-2, logical in this way
It crosses bearing block 1-2 spindle drive is fixed on cabinet 1-1.Main shaft is designed as multi-diameter shaft along axial section shape, i.e.,
Part among angular contact ball bearing is relatively slightly, to attenuate to both ends are steps.
As shown in fig. 1, leaf dish balance mechanism includes leaf dish 7, connection flange 8 and blade 6, and the outer edge of leaf dish 7 is equipped with
The end of blade 6, gas motor spindle 13 is fixedly connected with leaf dish 7 by connection flange 8, and leaf dish 7 and blade 6 are placed in support ring 4
In cavity ring.Different blade rotational speeds is realized by controlling gas motor, realizes different intrusion revolving speeds.Foil gauge is attached to blade
On, foil gauge connects and transmits signal by electric brush slip ring, and electric brush slip ring is located in the medium pore of leaf dish 7.
Further, the lower section of leaf dish 7 is equipped with 4 unbalanced constructions, as uneven regulating mechanism.4 unbalanced constructions
Be it is arranged symmetrically, make leaf dish that can keep equilibrium state under normal conditions, i.e., adjacent unbalanced construction exists in 90 ° of angles settings two-by-two
The lower section of leaf dish, as shown in figure 4, each unbalanced construction includes that electromagnet 32, spring 33, balance mass block 34 and electromagnetism are sliding
Nail 35, electromagnet is fixed on leaf dish side, and adjacent electromagnet is set as cavity on the inside of leaf dish, is equipped with spring 33, spring in cavity
33 one end is fixedly connected with electromagnet 32, and the other end of spring 33 is fixedly connected with the sliding nail 35 of electromagnetism, and the sliding nail 35 of electromagnetism will balance matter
Gauge block 34 is fixed in leaf dish 7, and the specifically sliding nail 35 of electromagnetism passes through balance mass block 34, leaf dish 7 is connected to, when the sliding nail 35 of electromagnetism
When being detached from balance mass block 34, balance mass block 34 will be disengaged from leaf dish 7.Under normality, the sliding nail 35 of electromagnetism passes through the elastic force of spring 33
It will inject in balance mass block 34 and be connected to leaf dish 7；When electromagnet 32 is powered, the sliding nail 35 of electromagnetism is attracted to overcome the bullet of spring
Power in retraction cavity, makes to balance mass block 34 and is detached from leaf dish.Reserved logical window is equipped in the center of block.It is logical to balance mass block 34
Reserved logical window is crossed to fall.The size of cavity is that can accommodate the sliding nail 35 of electromagnetism to completely disengage balance mass block 34.Balance mass block 34
It can be set as made of copper.It can be additionally provided with rotor hexagon bracket in the lower end surface of support ring, receive the balance matter to fall down in leaf dish
Gauge block is equipped with reserved logical window in the center of the block.
When being powered, electromagnet obtains magnetism under electric field excitation, and the sliding nail of the electromagnetism of attraction overcomes the elastic force of spring, makes
Balance mass block made of copper is separated with leaf dish, the structure in leaf dish altogether there are four, one of to be detached from, mass center will be to opposite direction
Deviate, generates amount of unbalance and rub so as to cause touching.It can realize that burst imbalance causes in rotation by control rotor balancing amount
Rub experiment when impact-rub malfunction.
Further, gap adjusting mechanism includes Cam feed machine and lead screw feed mechanism, as shown in figure 5, cam feed
Mechanism includes that sliding 20, two 15, cam 17, cam slide 18, cam limit block 19, the cam limit screw cams followed closely of cam are led
Rail 21, driving cylinder 31 and cam fixed plate 23；Cam fixed plate 23 is fixed on the top of lead screw feed mechanism, and two cams are led
Rail 21 is fixed on the top of cam fixed plate 23, and cam slide 18 is fixed in two cam tracks 21, and cam slide 18 can edge
Rectilinear direction sliding is done in cam tracks 21, cam 17 is fixed on 18 top of cam slide, in this way, cam 17 can be in cam tracks
It is slided on 21, the two sides of two cam tracks 21 are respectively perpendicular to cam tracks 21 equipped with cam limit block 19, cam limit
Block 19 can be fixed in cam tracks 21 by limited block fixing screws 22, and the side of a cam limit block 19 is equipped with
Cam limit screw 20, cam limit screw 20 vertically screw in cam limit block 19 in, can have adjust cam slide 18 with it is convex
Take turns the contact distance between limited block 19.Driving the push rod of cylinder 31 to pass through, another described cam limit block 19 is fixed to be connected
Cam slide 18 is connect, driving cylinder 31 drives cam slide 18 to move in cam tracks 21, the fixed cam in the top of cam 17
The other end of one end of sliding nail 15, the sliding nail 15 of cam connects support ring 4.As shown in Figure 2, opposite with column 2 in support ring 4
Position be equipped with sliding nail hole, the center of circle at the center of sliding nail hole and the center of circle of column and support ring, on the same line.Cam is sliding
The other end of nail 15 passes through sliding nail hole, and the movement of cam 17 drives support ring that position occurs and move with the movement of the sliding nail 15 of moving cam
It is dynamic.It drives cylinder to push cam, move support ring can in the x-direction.It can be used to adjust and touch intrusion volume of rubbing.
Cam tracks 21 can be fixed by bolts in cam fixed plate 23；Cam 17 is fixed by bolts to cam slide 18
On, one is formed with cam slide 18；Driving cylinder 31 can be fixed on the side plate of cam fixed plate 23；The sliding nail 15 of cam and branch
Pushing out ring 4 connects firmly.Cam slide 18 moves in a straight line in cam tracks 21 under the promotion of driving cylinder 31.Support ring with it is convex
The side cylindrical surface of skidding nail is tangent constraint, therefore the sliding nail of cam follows support ring using trunnion as the subtle swing of rotation center, with reality
The adjusting of existing intrusion volume.
As shown in fig. 6, lead screw feed mechanism includes feed screw nut 24, lead screw guide rails support frame 25, lead screw 26, lead screw support
Seat 27, MLL diaphragm coupling 28 and stepper motor 29, lead screw guide rails support frame 25 are fixed on block 1, above lead screw support frame
Center be fixed with stepper motor, stepper motor 29 connects lead screw 26, the both ends difference of lead screw 26 by MLL diaphragm coupling 28
It is fixed on lead screw guide rails support frame 25 by lead screw support base 27, feed screw nut 24, feed screw nut 24 is equipped among lead screw 26
As stepper motor drives lead screw 26 to move in the y-direction, the fixed cam fixed plate 23 in the top of feed screw nut 24.Cam tracks institute
It is mutually perpendicular in straight line where straight line with lead screw.
Further, in order to enable cam fixed plate 23 is stable to be subjected to displacement in the y-direction by feed screw nut, lead screw feeding
Mechanism further includes two lead screw linear guides 30 and four straight-line guide rail slide blocks 16, in the top of lead screw guide rails support frame 25, silk
The two sides of thick stick are parallel to lead screw and are respectively equipped with lead screw linear guide 30, and straight-line guide rail slide block 16 is led in the every lead screw straight line
There are two setting on rail, straight-line guide rail slide block 16 can slide in lead screw linear guide 30, and the top of straight-line guide rail slide block is all fixed
In the cam fixed plate.
Key connecting, the modes such as interference fit joint can be used in leaf dish and main shaft in the rotor, but have the arrangement of electric brush slip ring, so
Using connection flange as intermediate coupling mechanism.
Further, the connecting mode of leaf dish and blade is using tree-like joggle type is indulged, and blade tenon is wedge shaped, wheel rim convex block
In inverted wedge shape, tenon is with a gap in insertion groove, after allowing wheel rim heated can free wxpansion, thus the heat for reducing junction is answered
Power, assembly and disassembly and replacement blade are convenient.
Gas motor can be used in vane air motor, piston type pneumatic motor, gear type gas motor and swing type gas motor
It is any, preferably vane air motor.Vane air motor can meet the adjusting variation of revolving speed and revolving speed, and revolving speed requirement
Height can simulate true blade-casing rub impact phenomena.Change revolving speed by adjusting the supply gas pressure of air motor to realize rotor
Rub experiment of the system under different rotating speeds, the range of speeds can in 0~12000r/min step-less adjustment.
Stator casing feeding of the invention mainly by lead screw feed mechanism and Cam feed machine accurately feed two and pack into
It is formed to device, lead screw fast feed drives lead screw 26 to rotate with determining angle stepping by stepper motor 29, so that lead screw spiral shell
Mother 24 the direction x move, and then drive guide rail slide block 15, cam fixed plate 23 the direction x move, thus drive entire cam into
It is moved to mechanism in the direction x, to realize the fast feed of stator casing.It is sliding that the accurate feeding of cam 17 is driven by the cylinder 31 cams
Block 17 makees linear slide with moving cam 16 in the y-direction, to make the sliding nail 15 of cam on perpendicular to the cam direction of motion, i.e. the side x
To movement, support ring 4 is driven to rotate around column 2, to realize the accurate feeding of stator casing.The step pitch of lead screw fast feed is
It 10 μm, may be implemented to adjust in 0~900 μ m, cam, which is accurately fed, may be implemented accurately to adjust in 0~100 μ m.
The accurate control that intrusion volume may be implemented in 0~1000 μ m is accurately fed by lead screw fast feed and cam.
Support system is tested mainly to be carried out by sensors such as three-dimensional load cell, displacement characteristic sensor, foil gauges.
Load cell using three-dimensional load cell can measure three directions it is different touch power of rubbing, it is big really to be touched power of rubbing
It is small；The stress of the certain positions of blade under the degree of rubbing are touched to difference using foil gauge directly to be measured, and are assessed blade and touched to rub and be
It is no that blade low order and high frequent vibration can be excited to respond；Acceleration (displacement) sensor is mainly used to test the vibration acceleration of casing
(displacement) touches caused impact degree of rubbing with assessment.
Experimental provision through the invention considers the influence of casing elasticity and abradable coating, using three-dimensional force-measuring sensing
Device measures the power of rubbing of touching in three directions, analyzes the parameters pair such as different intrusion rates, intrusion volume, amount of unbalance, different coating hardness
Touch the affecting laws for power of rubbing.By test data of experiment determination and the necessary model parameter of amendment, and then analyze different operation items
Blade nonlinear dynamic characteristic under part explores blade vibration, touches the coupling mechanism to rub between coating abrasion.
Rotor blade rotary system in the present invention is driven using air motor, and large-scale stepless speed regulation may be implemented with suitable
Answer requirement of the experimental bench to speed is not stalled.
Uneven regulating mechanism of the invention can form a variety of uneven feelings by adjusting the mass eccentricity of rotor leaf dish
Condition is realized and generates burst imbalance in high-speed rotation.
Stator casing feed system of the invention by cam+lead screw feed mechanism realize a wide range of intrusion volume it is quick,
It is accurate to adjust, to realize test of the experimental bench in the case where not having to intrusion volume.
Measurement to different casing coatings may be implemented by the casing coating to rub that touches of replacement support in the present invention, and passes through
The kinds of experiments data during rubbing are touched in three-dimensional load cell and displacement characteristic sensor, measurement.
(1) by gas motor driving spindle, the rotation of leaf dish piece is driven, revolving speed can reach 7000r/min, and being capable of the short time
Interior highest running speed reaches 10000r/min.
(2) by cylinder driving equipment, driving cam slide slides in cam tracks, makes the cunning directly contacted with cam
The vertical direction that following closely can move when cam moves in a straight line in cam realizes that movement dimension is micron-sized movement, to realize essence
The really control amount of feeding；Ball-screw is driven by stepper motor, ball nut and linear guide is enable to obtain accurate straight line
Amount of exercise, to realize the feeding of opposing cam mechanism faster speed；By two kinds of feeding schemes, blade-casing gap is realized
Adjustment rubs to realize to touch.
(3) electric structure on the rotor on experimental bench is powered by structures such as brushes, makes to measure leaf on blade
The foil gauge of piece stress, for realizing the Electric control of unbalanced construction in leaf dish, to realize the mistake in experimental provision operation
Mutation amount of unbalance is generated in journey, and rotor-support-foundation system is made to generate rub impact phenomena because of imbalance.
In order to increase amount of unbalance, rotor-support-foundation system is set to isolate a part of quality during rotation using Electromagnetic Control,
Biggish mass center eccentricity is generated, when being powered, right side electromagnet obtains magnetism under electric field excitation, and the electromagnetism of suction left is sliding
Nail, overcome the elastic force of spring, separate balance mass block made of copper with leaf dish, the structure in leaf dish be total to there are four, wherein one
A disengaging, mass center will deviate to opposite direction, generate amount of unbalance and rub so as to cause touching.
Embodiment 2
Experimental provision provided by the invention, which carries out test process, can be used following operation progress:
1. preparing before test:
It is 0 that experimental provision, which should pre-adjust before experiment and touch gap of rubbing, adjusts intrusion volume, blade by gap adjusting mechanism
On be connected with power cathode, be connected with positive pole on casing, when gap > 0, the two is not contacted, i.e., no current signal, when connecing
(generation intrusion volume) generates current signal when touching, therefore is adjusted by gap adjusting mechanism to 1 μm of readjustment when just generating electric current
Think that gap is 0.
2. touching characteristic of rubbing under different rotating speeds
The characteristic of rubbing of touching in the case of different rotating speeds is needed to control remaining variables and remained unchanged, setting one is given to touch
It such as 50 μm of the amount of rubbing, is rotated by gas motor driving spindle and drives impeller blade rotation, adjusted supply gas pressure, make rotor with 1000r/
The revolving speed of min rotates, and by connecting three-dimensional load cell with casing coating, measures the force data that rubs that touches for touching and rubbing when occurring, and passes through
It crosses computer disposal and calculates the size and Orientation for touching power of rubbing.The dynamic stress on blade is measured by foil gauge, and data are passed
Transport to distribution situation of the computer analysis stress on blade.
Change revolving speed, tested with the incremental speed of 1000r/min, duplicate measurements step, until revolving speed increases to
10000r/min。
3. touching characteristic of rubbing under different intrusion volumes
The characteristic of rubbing of touching in the case of rubbing intrusion volume is touched for difference to need to control remaining variables and remain unchanged, and is in revolving speed
In the case where 7000r/min, sets one and initially touch the amount of rubbing as 150 μm (50 μm of intrusion volumes have been obtained in previous step measurement), lead to
It crosses and connect three-dimensional load cell with casing coating, measure to touch to rub and touch the force data that rubs when occurring, calculated by computer disposal
The size and Orientation for power of rubbing is touched out.The dynamic stress on blade is measured by foil gauge, and sends data to computer analysis and answers
Distribution situation of the power on blade.
Intrusion volume is accurately adjusted by cam, intrusion volume increment, which is 5 μm, increases to 250 μm from 150 μm, repeats previous step behaviour
Make, records data.
Intrusion volume is quickly adjusted by lead screw and successively increases 100 μm, until intrusion volume is adjusted to 950 μm.Repeat previous step
Operation records data.
4. burst non-equilibrium state touches characteristic of rubbing
The characteristic of rubbing of touching in the case of rubbing intrusion volume is touched for difference to need to control remaining variables and remain unchanged, and is in revolving speed
In the case where 7000r/min, sets and touch intrusion volume of rubbing as 150 μm, by connecting three-dimensional load cell with casing coating, measure
It touches to rub and touches the force data that rubs when occurring, the size and Orientation for touching power of rubbing is calculated by computer disposal.It is measured by foil gauge
Dynamic stress on blade, and send data to distribution situation of the computer analysis stress on blade.
It is transmitted on electric signal to the electromagnet of side by brush at this time, obtains electromagnet electric, attract sliding nail, make to balance matter
Gauge block falls off, and generates an amount of unbalance, measures it and touches the dynamic stress rubbed on power size direction and blade.
The electromagnet for controlling the balance mass block other side to fall off at this time, makes the balance mass block of opposite side fall off, and changes flat
Weighing apparatus state, measures again.
Repetitive operation, the balance mass block for the adjacent volume that falls off, and measure record data.
Repetitive operation, fall off last block mass block, and restore balance state, and measures record data.
5. different casing coatings touch characteristic of rubbing
There are two types of casing coatings, respectively steel casing and aluminum casing.
Using steel casing, in the case where revolving speed is 7000r/min, sets and touch intrusion volume of rubbing as 150 μm, keep balance
State measures to touch to rub and touches the force data that rubs when occurring, at computer by connecting three-dimensional load cell with casing coating
Reason calculates the size and Orientation for touching power of rubbing.
It shuts down, replaces aluminum casing, guarantee to measure and record data under previous step the same terms.
By above-mentioned measurement different rotating speeds, different intrusion volumes, the uneven and different casing coatings of burst, it can be achieved that turning stator
Rub experiment touches touching when rubbing and rubs the data such as power size and Orientation, blade dynamic stress.
The above described is only a preferred embodiment of the present invention, being not the limitation for doing other forms to the present invention, appoint
What those skilled in the art can use the equivalence enforcement that technology contents disclosed above were changed or be modified as equivalent variations
Example.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to the above embodiments
What simple modification, equivalent variations and remodeling, still falls within the protection scope of technical solution of the present invention.
Claims (10)
1. a kind of rubbing test device for turning stator, which is characterized in that it includes block, cabinet, three-dimensional load cell, displacement
Feature sensor, foil gauge touch the supporting mechanism that rubs, leaf dish balance mechanism, spindle drive and gap adjusting mechanism, described to touch
The supporting mechanism that rubs is fixed on the side above the block, described to touch the supporting mechanism that rubs equipped with support ring as stator, the master
Shaft transmission is fixed on the top of the cabinet, and the spindle drive is connected and provided for the leaf dish balance mechanism dynamic
Power, the leaf dish of the leaf dish balance mechanism is as rotor, and the stator is correspondingly arranged with rotor, on the inner sidewall of the support ring
Equipped with casing, the three-dimensional load cell and displacement characteristic sensor are attached on the casing；The foil gauge is attached to described
Have on the blade of leaf dish；The gap adjusting mechanism is fixed on the other side above the block, and the gap adjusting mechanism is used
In the clearance distance for adjusting leaf dish in the support ring and the leaf dish balance mechanism, the cabinet is placed in above block, described
It touches the supporting mechanism that rubs, leaf dish balance mechanism and gap adjusting mechanism and is placed in box house.
2. rubbing test device as described in claim 1, which is characterized in that the supporting mechanism that rubs that touches includes column, support
Ring housing, casing and support ring, the lower end of the column are fixed on the block, and the support ring housing and support ring are fixed
It is equipped with trunnion between the upper end of column, the support ring housing and the column, revolves the support ring around the column
Turn, the support ring is cavity ring, and the casing is fixed on the inner wall of the cavity ring.
3. rubbing test device as claimed in claim 2, which is characterized in that the length of the casing is 90 ° of arcs of cavity ring
Shape size, the casing are coated with casing coating towards turntable on one side, and the setting position of the casing is the company for making casing both ends
Straight line where line is parallel to each other with support ring center and the straight line where the line at column center.
4. rubbing test device as described in claim 1, which is characterized in that the casing coating connects the three-dimensional dynamometry and passes
Sensor, the three-dimensional load cell can be arranged in any position on casing.
5. rubbing test device as described in claim 1, which is characterized in that the spindle drive includes gas motor, film
Piece shaft coupling, main shaft, angular contact ball bearing, bearing block and bearing (ball) cover, the gas motor connects the diaphragm coupling, described
Diaphragm coupling connects the main shaft, and there are two angular contact ball bearing and bearing (ball) cover, the angular contacts for socket on the main shaft
Ball bearing is connected to bearing block, and the bearing (ball) cover is fixed on bearing block, and the bearing block is fixed on the cabinet；It is described
Leaf dish balance mechanism includes leaf dish, connection flange and blade, and the outer edge of the leaf dish is equipped with blade, and the main the tip of the axis is logical
It crosses connection flange and is fixedly connected with the leaf dish, the leaf dish and blade are placed in the cavity ring of the support ring.
6. rubbing test device as claimed in claim 5, which is characterized in that the gas motor is vane air motor, piston
Any one of formula gas motor, gear type gas motor and swing type gas motor, the shape of the main shaft are multi-diameter shaft.
7. rubbing test device as described in claim 1, which is characterized in that 4 be provided symmetrically below the leaf dish
A unbalanced construction, each unbalanced construction include electromagnet, spring, balance mass block and the sliding nail of electromagnetism, the electromagnetism
Ferropexy is in the leaf dish side, and adjacent electromagnet is set as cavity on the inside of the leaf dish, is equipped with spring, the electromagnetism in cavity
One end for being fixedly connected with the spring of iron, the other end of the spring are fixedly connected with the sliding nail of the electromagnetism, the sliding nail of the electromagnetism
The balance mass block is fixed in the leaf dish, when the solenoid is energized, attracts in the sliding nail retraction cavity of electromagnetism, makes to balance
Mass block is detached from leaf dish.
8. such as rubbing test device of any of claims 1-7, which is characterized in that the gap adjusting mechanism includes
Cam feed machine and lead screw feed mechanism, the Cam feed machine include the sliding nail of cam, cam, cam slide, two it is convex
Take turns limited block, cam limit screw, two cam tracks, driving cylinder and cam fixed plate；The cam fixed plate is fixed
In the top of the lead screw feed mechanism, two cam tracks are fixed on the top of the cam fixed plate, the cam
Sliding block is slidably fixed in the cam tracks, and the cam is fixed on the cam slide, the two sides of the cam tracks
It is respectively equipped with cam limit block, the side of a cam limit block is equipped with cam limit screw, and the driving cylinder pushes away
Bar passes through another described cam limit block, and is fixedly connected with the cam slide, and the driving cylinder drives cam slide
It is moved in cam tracks, one end of the sliding nail of the fixed cam in the top of the cam, the other end of the sliding nail of the cam connects
Connect the support ring.
9. rubbing test device as claimed in claim 8, which is characterized in that the lead screw feed mechanism include feed screw nut,
Lead screw guide rails support frame, lead screw, lead screw support base, MLL diaphragm coupling and stepper motor, the lead screw guide rails support frame are fixed
On the block, the center above the lead screw guide rails support frame is fixed with stepper motor, and the stepper motor passes through MLL film
Piece shaft coupling connects lead screw, and the both ends of the lead screw pass through lead screw support base respectively and are fixed on the lead screw guide rails support frame,
The feed screw nut is equipped among the lead screw, the feed screw nut drives lead screw to be axially moved along lead screw with stepper motor,
The fixed cam fixed plate in the top of the feed screw nut.
10. rubbing test device as claimed in claim 9, which is characterized in that the lead screw feed mechanism further includes two with silk
Thick stick linear guide and four straight-line guide rail slide blocks, in the top of the lead screw guide rails support frame, the two sides of lead screw are parallel to lead screw
It is respectively equipped with the lead screw linear guide, it is described straight there are two the straight-line guide rail slide block is set in the lead screw linear guide
Line guide rail slide block can slide in lead screw linear guide, and it is solid that the cam is fixed in the top of each straight-line guide rail slide block
Fixed board.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810517852.6A CN108956068A (en) | 2018-05-25 | 2018-05-25 | A kind of rubbing test device turning stator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810517852.6A CN108956068A (en) | 2018-05-25 | 2018-05-25 | A kind of rubbing test device turning stator |
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| CN201810517852.6A Pending CN108956068A (en) | 2018-05-25 | 2018-05-25 | A kind of rubbing test device turning stator |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207916A (en) * | 2020-01-09 | 2020-05-29 | 东南大学 | Blade inclination angle adjustable rubs device |
| CN111795794A (en) * | 2020-07-13 | 2020-10-20 | 姜春林 | Rub-impact mechanism and rub-impact parameter measuring sensor |
| CN111947835A (en) * | 2020-08-17 | 2020-11-17 | 哈电发电设备国家工程研究中心有限公司 | Sudden unbalance fault simulation device and method applying rotating machinery |
| CN111947836A (en) * | 2020-08-17 | 2020-11-17 | 哈电发电设备国家工程研究中心有限公司 | Test device and method for simulating sudden unbalance fault of rotor system |
| CN113588272A (en) * | 2021-07-23 | 2021-11-02 | 上海交通大学 | Double-rotor blade composite fault simulation test bed |
| CN114061408A (en) * | 2021-11-11 | 2022-02-18 | 哈尔滨工业大学 | A clearance control test mechanism for apex clearance test |
| CN114323611A (en) * | 2021-12-21 | 2022-04-12 | 哈电发电设备国家工程研究中心有限公司 | Rubbing fault simulation test device applied to rotary machine and control method |
| CN114354196A (en) * | 2022-03-22 | 2022-04-15 | 天津仁爱学院 | Actively-cooled rubbing experiment feeding device and method |
| FR3132350A1 (en) * | 2022-02-02 | 2023-08-04 | Airbus Helicopters | rotor unbalance simulator and test bench equipped with this simulator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528813A (en) * | 2013-10-28 | 2014-01-22 | 东北大学 | Rubbing experimental device of blade-coating machine case |
| CN107229772A (en) * | 2017-04-24 | 2017-10-03 | 东北大学 | A kind of flexible casing of improved rotating vane touches Mo Li and determines method |
-
2018
- 2018-05-25 CN CN201810517852.6A patent/CN108956068A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528813A (en) * | 2013-10-28 | 2014-01-22 | 东北大学 | Rubbing experimental device of blade-coating machine case |
| CN107229772A (en) * | 2017-04-24 | 2017-10-03 | 东北大学 | A kind of flexible casing of improved rotating vane touches Mo Li and determines method |
Non-Patent Citations (2)
| Title |
|---|
| PADOVA C: ""Development of an experimental capability to produce controlled blade tip/shroud rubs at engine speed"", 《JOURNAL OF TURBOMACHINERY》 * |
| 习原: ""突发不平衡转子实验台设计"", 《振动与冲击》 * |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207916B (en) * | 2020-01-09 | 2021-01-12 | 东南大学 | Blade inclination angle adjustable rubs device |
| CN111207916A (en) * | 2020-01-09 | 2020-05-29 | 东南大学 | Blade inclination angle adjustable rubs device |
| CN111795794A (en) * | 2020-07-13 | 2020-10-20 | 姜春林 | Rub-impact mechanism and rub-impact parameter measuring sensor |
| CN111795794B (en) * | 2020-07-13 | 2021-12-31 | 姜春林 | Rub-impact mechanism and rub-impact parameter measuring sensor |
| CN111947836B (en) * | 2020-08-17 | 2022-05-27 | 哈电发电设备国家工程研究中心有限公司 | Test device and method for simulating sudden unbalance fault of rotor system |
| CN111947835A (en) * | 2020-08-17 | 2020-11-17 | 哈电发电设备国家工程研究中心有限公司 | Sudden unbalance fault simulation device and method applying rotating machinery |
| CN111947836A (en) * | 2020-08-17 | 2020-11-17 | 哈电发电设备国家工程研究中心有限公司 | Test device and method for simulating sudden unbalance fault of rotor system |
| CN113588272A (en) * | 2021-07-23 | 2021-11-02 | 上海交通大学 | Double-rotor blade composite fault simulation test bed |
| CN114061408A (en) * | 2021-11-11 | 2022-02-18 | 哈尔滨工业大学 | A clearance control test mechanism for apex clearance test |
| CN114061408B (en) * | 2021-11-11 | 2022-10-21 | 哈尔滨工业大学 | A clearance control test mechanism for apex clearance test |
| CN114323611A (en) * | 2021-12-21 | 2022-04-12 | 哈电发电设备国家工程研究中心有限公司 | Rubbing fault simulation test device applied to rotary machine and control method |
| CN114323611B (en) * | 2021-12-21 | 2023-09-22 | 哈电发电设备国家工程研究中心有限公司 | Rub-impact fault simulation test device and control method applied to rotary machinery |
| FR3132350A1 (en) * | 2022-02-02 | 2023-08-04 | Airbus Helicopters | rotor unbalance simulator and test bench equipped with this simulator |
| EP4224133A1 (en) | 2022-02-02 | 2023-08-09 | Airbus Helicopters | Unbalance simulator of a rotor and test bench with this simulator |
| CN114354196A (en) * | 2022-03-22 | 2022-04-15 | 天津仁爱学院 | Actively-cooled rubbing experiment feeding device and method |
| CN114354196B (en) * | 2022-03-22 | 2022-11-25 | 天津仁爱学院 | Actively-cooled rub-impact experiment feeding device and method thereof |
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Application publication date: 20181207 |