CN104266910B - Method and device for loading fatigue test force - Google Patents

Method and device for loading fatigue test force Download PDF

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Publication number
CN104266910B
CN104266910B CN201410554034.5A CN201410554034A CN104266910B CN 104266910 B CN104266910 B CN 104266910B CN 201410554034 A CN201410554034 A CN 201410554034A CN 104266910 B CN104266910 B CN 104266910B
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force
hydraulic cylinder
moment
servo hydraulic
loading
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CN104266910A (en
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吴国雄
仝宁可
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Suzhou Dongling Vibration Test Instrument Co Ltd
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Suzhou Dongling Vibration Test Instrument Co Ltd
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Abstract

The invention discloses a method and a device for loading a fatigue test force. The method comprises the following steps: applying a composite force to a cross force loading plate through servo hydraulic cylinders so as to load the force of a test piece. The force applying device mainly comprises a loading mechanism comprising the cross force loading plate, the first servo hydraulic cylinder and the second servo hydraulic cylinder, wherein the first servo hydraulic cylinder is fixed to a fixing plate, and the piston rod of the first servo hydraulic cylinder is connected with a force sensor and fixed on the upper end surface of the cross force loading plate; the second servo hydraulic cylinder is fixed on the inner side edge of a fixing frame, and the piston rod of the second servo hydraulic cylinder is connected with a force sensor and fixed on one side of the cross force loading plate. According to the method, the force applied to the upper plane of the cross force loading plate is converted into the bending moment, the torque and the circulating bending moment, so that the composite force is loaded. According to the device, the force of the test piece is loaded through the servo hydraulic cylinders, and the deficiencies in the prior art are overcome as the servo hydraulic cylinders are large in output force, small in volume, high in control precision and relatively high in reliability.

Description

The loading method and its device of fatigue test power
Technical field
The invention belongs to mechanical test technical field, and in particular to the loading method of fatigue test power, and use this side The device of method.
Background technology
Fatigue refers to the damage accumulation of material or structure under alternate load ringing until the phenomenon of destruction.Tired row It is the load cycle cycle according to needed for there is fatigue rupture, is divided into low-cycle fatigue (circulation cycle is less than 105), high cycle fatigue (circulation cycle is between 105 to 107) and super high cycle fatigue (circulation cycle is more than 107).
For example, aircraft engine fan shaft is one of vital part of aircraft, it is in the complicated bar of high speed, high temperature, stress Operated under part, its quality and performance directly influence engine performance, life and reliability.In order to ensure the matter of engine spindle Amount and performance, it must operationally possess enough fatigue strength.Generally, testing main power to fatigue test is included axially Power, moment of torsion, moment of flexure, circulation moment of flexure etc..
The loading method of common fatigue test power is to be equipped with plus-minus by stepper motor or servomotor or common electric machine Fast case and auxiliary body realize the loading of power.But, when moment of torsion loaded value is larger, stepper motor or servomotor are often up to Less than requirement of exerting oneself;The loading force by the way of common electric machine is equipped with acceleration and deceleration case, its mechanism's overall volume is larger, control accuracy It is relatively low, and can be realizing Zhou Xunhuan high.Thus, the method for above loading force all has some limitations.
The content of the invention
In order to solve the above-mentioned technical problem, it is high it is an object of the invention to provide a kind of small volume, control accuracy and reliable The loading method and its device of property fatigue test power higher.
To achieve these goals, technical solution of the present invention is as follows:
A kind of loading method of fatigue test power, there is provided cross reinforcing disk, axial force distribution servo hydraulic cylinder, moment of flexure force are watched Hydraulic cylinder and moment of torsion force servo hydraulic cylinder are taken, the axial force distribution servo hydraulic cylinder is fixedly arranged on the cross reinforcing disk upper end The zone line in face, the moment of flexure force servo hydraulic cylinder is fixedly arranged at the angle of the cross reinforcing disk upper surface, the moment of torsion Force servo hydraulic cylinder is fixedly arranged on the cross reinforcing disk one side;
The loading method is comprised the following steps:
(1) test specimen is fixedly arranged on the bottom that the cross reinforces disk, reinforcing disk to the cross by servo hydraulic cylinder applies Plus composite force, to act on test specimen, the specific composite force for applying includes:
A. the axial force distribution servo hydraulic cylinder applies pulling force F4 vertically upward to the upper surface of cross reinforcing disk;
B. the moment of flexure force servo hydraulic cylinder reinforces applying a pair longitudinally asymmetricly for the upper surface of disk to the cross In the opposite direction, equal-sized pulling force F1 and thrust F1 ';
C. the moment of flexure force servo hydraulic cylinder reinforces applying a pair lateral symmetryly for the upper surface of disk to the cross In the opposite direction, equal-sized pulling force F2 and thrust F2 ';
D. the moment of torsion force servo hydraulic cylinder is symmetrically loaded to the side laterally or longitudinally of cross reinforcing disk A pair in opposite direction, equal-sized pulling force F3 and thrust F3 ';
(2) each power being applied in step (1) on the cross reinforcing disk is respectively acting on test specimen, then test specimen is born Axial force is F4, and the pulling force F1 and thrust F1 ' that test specimen is born form moment M 1, M1=F1*L1 in the form of pushing away a drawing with one, or M1=F1 ' * L1, the pulling force F2 and thrust F2 ' that test specimen is born form moment M 2, M2=F2*L2 in the form of pushing away a drawing with one, or M2=F2 ' * L2, the pulling force F3 and thrust F3 ' that test specimen is born form moment of torsion M3, M3=F3*L3 in the form of pushing away a drawing with one, its In, L1, L2, L3 are the arm of force to stress;
(3) direction of moment M 1 and moment M 2 intersects into 90 degree, and moment M 1 is sinusoidal variations moment of flexure, and M2 is that varies with cosine is curved Square, when the applying simultaneously of moment M 1 and moment M 2, and frequency are identical, according to lissajous figures theorem, the direction of motion is mutually perpendicular to Two harmonic signals can synthesizing stable movement locus, and its movement locus for ellipse, then moment M 1 and moment M 2 are according to institute Stating lissajous figures theorem can synthesize circulation moment M 0, and the movement locus of M0 is ellipse.
Used as one of preferred scheme of the invention, when the amplitude of M1 and M2 is equal, the movement locus of M0 is circle, M0's Amplitude is the amplitude for being equal to M1 and M2.
Used as one of preferred scheme of the invention, each power being applied in step (1) on the cross reinforcing disk passes through power Force signal is converted to electric signal by sensor sensing, the force snesor, and electric signal is passed into connected collection Control system, acquisition control system converts the electrical signal to data signal, and passes to the computer digital animation being attached thereto System, the computer data processing system is processed and calculated to data signal, to immediately arrive at F1, M1, M2, M3, M0 Value.
A kind of loading device of fatigue test power, including base, guide pillar, fixed platform, power load maintainer, lead described in four It is fixedly arranged on the base, four top ends of guide pillar are connected on a lamina tecti, and the top is located on the guide pillar column symmetry The lower section of cover plate is also arranged with a fixed plate and fixed frame successively, and the fixed platform is fixedly arranged on the base, sets thereon There is the fixation kit for fixing test specimen, and the fixed platform is located at four centres of guide pillar;
The power load maintainer includes cross reinforcing disk above the fixation kit, the first servo hydraulic cylinder, the Two servo hydraulic cylinders, first servo hydraulic cylinder is perpendicularly fixed in the fixed plate through connector, its piston lever-connection-force Sensor, and the upper surface that the cross reinforces disk is fixed on through connector, second servo hydraulic cylinder is fixed through connector In on the inner side edge of the fixed frame, its piston lever-connection-force sensor, and it is fixed on the cross reinforcing disk through connector Side.
Used as one of preferred scheme of the invention, first servo hydraulic cylinder is fixedly arranged on the cross reinforcing disk including one The axial force distribution servo hydraulic cylinder of upper surface zone line, the moment of flexure force servo being installed with described four angles of cross reinforcing disk Hydraulic cylinder, second servo hydraulic cylinder includes being fixed on a pair of moments of torsion force servo-hydraulic of the cross reinforcing disk side Cylinder.
Used as one of preferred scheme of the invention, the loading device also includes an elevator for being used to adjust height of specimen Structure, the hoisting mechanism include two adjusters being symmetrically fixedly arranged on the base, and the piston rod of the adjuster with The fixed frame is fixedly connected with.
As one of preferred scheme of the invention, the fixation kit include being fixedly arranged on bearing in the fixed platform with And bearing block.
Used as one of preferred scheme of the invention, the connector includes a spherical linkage.
Used as one of preferred scheme of the invention, the two ends of the base are installed with side plate, the top of the side plate respectively End face is fixedly connected with the lamina tecti.
Compared with prior art, advantages of the present invention at least that:The loading method of fatigue test power of the invention passes through Cross is reinforced into the power that plane applies on disk and is converted to moment of flexure, moment of torsion, circulation moment of flexure, it is achieved thereby that fatigue test composite force Loading;The loading device of fatigue test power of the invention applies a force to cross and reinforces on disk so as to realize by servo hydraulic cylinder Loading to test specimen power, due to servo hydraulic cylinder exert oneself greatly, small volume, control accuracy it is high, and reliability is higher, so as to overcome The deficiencies in the prior art.
Brief description of the drawings
It is right with reference to the accompanying drawings and detailed description in order to illustrate more clearly of architectural feature of the present invention and technical essential The present invention is described in detail.
Fig. 1 is a kind of structural representation of the loading device of the fatigue test power disclosed in the embodiment of the present invention;
Fig. 2 is a kind of front view of the loading device of the fatigue test power disclosed in the embodiment of the present invention;
Fig. 3 is a kind of top view of the loading device of the fatigue test power disclosed in the embodiment of the present invention;
Fig. 4 is the structural representation of the fixation kit disclosed in the embodiment of the present invention;
Fig. 5 is the structural representation that the connector disclosed in the embodiment of the present invention is connected with servo hydraulic cylinder;
Fig. 6 is the fatigue test system frame diagram disclosed in the embodiment of the present invention;
Fig. 7 is the loading schematic diagram of the composite force disclosed in the embodiment of the present invention.
Description of reference numerals:11- bases, 12- guide pillars, 13- fixed platforms, 14- lamina tectis, 15- fixed plates, 16- is fixed Frame, 17- crosses reinforcing disk, 181- axial force distribution servo hydraulic cylinders, 182- moments of flexure force servo hydraulic cylinder, 19- moments of torsion force is watched Take hydraulic cylinder, 20- connectors, 21- adjusters, 22- fixation kits, 23- side plates, 24- test specimens.
Specific embodiment
Below in conjunction with the accompanying drawing in the present embodiment, the technical scheme in embodiment is carried out specifically, clearly and completely retouch State.
Referring to shown in Fig. 1-7, a kind of loading method of fatigue test power, there is provided cross reinforcing disk, axial force distribution servo-fluid Cylinder pressure, moment of flexure force servo hydraulic cylinder and moment of torsion force servo hydraulic cylinder, axial force distribution servo hydraulic cylinder are fixedly arranged on cross and add The zone line of power disk upper surface, moment of flexure force servo hydraulic cylinder is installed with the angle of cross reinforcing disk upper surface, moment of torsion force Servo hydraulic cylinder is fixedly arranged on cross reinforcing disk one side;
The loading method is comprised the following steps:
(1) test specimen 24 is fixedly arranged on the bottom that cross reinforces disk 17, reinforcing disk 17 to cross by servo hydraulic cylinder applies Composite force, to act on test specimen 24 (aircraft engine fan shaft), the specific composite force for applying includes:
A. axial force distribution servo hydraulic cylinder 181 applies pulling force F4 vertically upward to the upper surface of cross reinforcing disk 17;
B. moment of flexure force servo hydraulic cylinder 182 applies a pair of directions to the longitudinally asymmetric of upper surface of cross reinforcing disk 17 Conversely, equal-sized pulling force F1 and thrust F1 ';
C. moment of flexure force servo hydraulic cylinder 182 applies a pair of directions to the lateral symmetry of upper surface of cross reinforcing disk 17 Conversely, equal-sized pulling force F2 and thrust F2 ';
D. moment of torsion force servo hydraulic cylinder 19 is symmetrically loaded a pair to the side laterally or longitudinally of cross reinforcing disk 17 In the opposite direction, equal-sized pulling force F3 and thrust F3 ', by taking the loading schematic diagram of composite force as shown in Figure 7 as an example, moment of torsion is applied Force servo hydraulic cylinder 19 is symmetrically loaded a pair in opposite direction, equal-sized pulling force to longitudinal side of cross reinforcing disk 17 F3 and thrust F3 ';
(2) each power being applied in step (1) on cross reinforcing disk 17 is respectively acting on test specimen 24, then test specimen 24 is born Axial force be F4, the pulling force F1 and thrust F1 ' that test specimen 24 is born push away a drawing with one in the form of formed moment M 1, M1=F1* L1, or M1=F1 ' * L1, the pulling force F2 and thrust F2 ' that test specimen 24 is born form moment M 2, M2=in the form of pushing away a drawing with one F2*L2, or M2=F2 ' * L2, the pulling force F3 and thrust F3 ' that test specimen 24 is born form moment of torsion M3, M3 in the form of pushing away a drawing with one =F3*L3, wherein, L1, L2, L3 are the arm of force to stress, the loading schematic diagram of composite force as shown in Figure 7, L3=L1, then M3 =F3*L1:
(3) direction of moment M 1 and moment M 2 intersects into 90 degree, and moment M 1 is sinusoidal variations moment of flexure, and M2 is that varies with cosine is curved Square, when the applying simultaneously of moment M 1 and moment M 2, and frequency are identical, according to lissajous figures theorem, the direction of motion is mutually perpendicular to Two harmonic signals can synthesizing stable movement locus, and its movement locus for ellipse, then moment M 1 and moment M 2 are according to Lee Sa such as graph theorem can synthesize circulation moment M 0, and the movement locus of M0 is ellipse.
When the amplitude of M1 and M2 is equal, the movement locus of M0 is circle, and the amplitude of M0 is the amplitude for being equal to M1 and M2.
Each power being applied in step (1) on cross reinforcing disk 17 is sensed by force snesor, and force snesor is by force signal Electric signal is converted to, and electric signal is passed into connected acquisition control system, acquisition control system turns electric signal Change data signal into, and pass to the computer data processing system being attached thereto, computer data processing system is believed numeral Number processed and calculated, to immediately arrive at the value of F1, M1, M2, M3, M0.
The loading method of fatigue test power of the invention (is applied to by the way that cross is reinforced into the power that plane applies on disk 17 Cross reinforces the power of the upper surface of disk 17 and side) moment of flexure is converted into by known force equation and mechanics principle, is turned round Square, circulation moment of flexure, it is achieved thereby that the loading of fatigue test power.
Referring to shown in Fig. 1-5, a kind of loading device of fatigue test power, including base 11, guide pillar 12, fixed platform 13, Power load maintainer, four guide pillars 12 are symmetrically fixedly arranged on base 11, and the top ends of four guide pillars 12 are fixedly arranged on a lamina tecti 14 On, the lower section on guide pillar 12 positioned at lamina tecti 14 is also arranged with a fixed plate 15 and fixed frame 16 successively, and fixed platform 13 is fixed In on base 11, be provided with for position and fixed test specimen 24 fixation kit 22, and fixed platform 13 leads positioned at four The centre of post 12;
Power load maintainer is watched including the cross reinforcing disk 17 positioned at the top of fixation kit 22, the first servo hydraulic cylinder, second Hydraulic cylinder is taken, the first servo hydraulic cylinder is perpendicularly fixed in fixed plate 15 through connector 20, its piston lever-connection-force sensor, and The upper surface that cross reinforces disk 17 is fixed on through connector 20, the second servo hydraulic cylinder is fixed on fixed frame 16 through connector 20 On inner side edge, its piston lever-connection-force sensor, and it is fixed on the side that cross reinforces disk 17 through connector 20.The two of base 11 End is installed with side plate 23 respectively, and top end face and the lamina tecti 14 of side plate 23 are fixedly connected with.
Specifically, shown in Figure 1, the first servo hydraulic cylinder is fixedly arranged on cross reinforcing disk 17 upper surface mesozone including one The axial force distribution servo hydraulic cylinder 181 in domain, a pair of moments of flexure force servo-hydraulic positioned at the both sides of axial force distribution servo hydraulic cylinder 181 Cylinder 182.Second servo hydraulic cylinder includes a pair moment of torsion force servo hydraulic cylinders 19 located at the cross reinforcing side of disk 17.
Wherein, axial force is loaded by axial force distribution servo hydraulic cylinder 181 and realized, loading force is pulling force;Moment of flexure passes through one Two rightabout pulling force and thrust of the moment of flexure force loading of servo hydraulic cylinder 182 are realized, load(ing) point can also basis It is actually needed and is adjusted.Moment of torsion passes through two rightabout pulling force of a pair of moment of torsion force loadings of servo hydraulic cylinder 19 and pushes away Power is realized.
The loading device also includes a hoisting mechanism for being used to adjust the height of test specimen 24, it is preferred that hoisting mechanism includes two The individual adjuster 21 for being symmetrically fixedly arranged on the bottom of fixed frame 16, when the piston rod Zhongchang of adjuster 21, fixed frame 16 is transported upwards It is dynamic, original shorter fan shaft placed can so be removed, change fan shaft more long.Otherwise it is equally applicable, in this way, logical Hoisting mechanism is crossed, the present apparatus can adapt to the fan shaft in different length.
Shown in Figure 4, fixation kit 22 includes the bearing and bearing block that are fixedly arranged in fixed platform 13.Fixation kit 22 ensure that fan shaft is not in the phenomenon rocked when cross reinforces applying power on disk 17.
Shown in Figure 5, the two ends of all servo hydraulic cylinders are all connected with connector 20, and connector 20 is a spherical hinge Chain, is used to compensate moment of torsion and moment test deflection angle.
It is shown in Figure 1, axle sleeve is provided with fixed plate 15 and fixed frame 16, guide pillar 12 is arranged in axle sleeve, is easy to lead To.
The loading device of this composite force, also needs to be connected with known mechanism and system when in use, specific such as Fig. 6 institutes Show fatigue test system frame diagram, servo hydraulic cylinder is connected with hydraulic efficiency servo-valve and hydraulic power unit successively, and force snesor is successively It is connected with acquisition control system and computer data processing system, and acquisition control system is also connected with hydraulic efficiency servo-valve.
The present invention reinforces the applying power of disk 17 to cross so as to realize the loading to the power of test specimen 24 by servo hydraulic cylinder, due to Servo hydraulic cylinder exert oneself greatly, small volume, control accuracy it is high, and reliability is higher, so as to overcome the deficiencies in the prior art.This Outward, the present disclosure additionally applies for other similar axial workpieces, thus the scope of application of the invention has certain popularity.
Above-mentioned specific embodiment, only illustrates technology design of the invention and architectural feature, it is therefore intended that allow and be familiar with this The stakeholder of item technology can implement according to this, but above said content is not intended to limit protection scope of the present invention, every foundation Any equivalent change or modification that Spirit Essence of the invention is made, all should fall under the scope of the present invention.

Claims (9)

1. the loading method of fatigue test power, it is characterised in that cross reinforcing disk, axial force distribution servo hydraulic cylinder, moment of flexure are provided Force servo hydraulic cylinder and moment of torsion force servo hydraulic cylinder, the axial force distribution servo hydraulic cylinder are fixedly arranged on the cross reinforcing The zone line of disk upper surface, the moment of flexure force servo hydraulic cylinder is fixedly arranged at the angle of the cross reinforcing disk upper surface, institute State moment of torsion force servo hydraulic cylinder and be fixedly arranged on the cross reinforcing disk one side;
The loading method is comprised the following steps:
(1) test specimen is fixedly arranged on the bottom that the cross reinforces disk, disk is reinforced to the cross by servo hydraulic cylinder applies multiple With joint efforts, to act on test specimen, the specific composite force for applying includes:
A. the axial force distribution servo hydraulic cylinder applies pulling force F4 vertically upward to the upper surface of cross reinforcing disk;
B. moment of flexure force servo hydraulic cylinder applies a pair of directions to the longitudinally asymmetric of the upper surface of cross reinforcing disk Conversely, equal-sized pulling force F1 and thrust F1';
C. moment of flexure force servo hydraulic cylinder applies a pair of directions to the lateral symmetry of the upper surface of cross reinforcing disk Conversely, equal-sized pulling force F2 and thrust F2';
D. the moment of torsion force servo hydraulic cylinder is symmetrically loaded a pair to the side laterally or longitudinally of cross reinforcing disk In the opposite direction, equal-sized pulling force F3 and thrust F3';
(2) each power being applied in step (1) on the cross reinforcing disk is respectively acting on test specimen, then the axial direction that test specimen is born Power is F4, and the pulling force F1 and thrust F1' that test specimen is born form moment M 1, M1=F1*L1, or M1=in the form of pushing away a drawing with one F1'*L1, the pulling force F2 and thrust F2' that test specimen is born form moment M 2, M2=F2*L2, or M2=in the form of pushing away a drawing with one F2'*L2, the pulling force F3 and thrust F3' that test specimen is born form moment of torsion M3, M3=F3*L3 in the form of pushing away a drawing with one, wherein, L1, L2, L3 are the arm of force to stress;
(3) direction of moment M 1 and moment M 2 intersects into 90 degree, and moment M 1 is sinusoidal variations moment of flexure, and M2 is varies with cosine moment of flexure, When the applying simultaneously of moment M 1 and moment M 2, and frequency are identical, according to lissajous figures theorem, the direction of motion orthogonal two Individual harmonic signal can synthesizing stable movement locus, and its movement locus for ellipse, then moment M 1 and moment M 2 are according to Lee Sa such as graph theorem can synthesize circulation moment M 0, and the movement locus of M0 is ellipse.
2. the loading method of fatigue test power according to claim 1, it is characterised in that when the amplitude of M1 and M2 is equal When, the movement locus of M0 is circle, and the amplitude of M0 is the amplitude for being equal to M1 and M2.
3. the loading method of fatigue test power according to claim 1, it is characterised in that be applied in step (1) described Each power on cross reinforcing disk is sensed by force snesor, and force signal is converted to electric signal by the force snesor, and by telecommunications Number connected acquisition control system is passed to, acquisition control system converts the electrical signal to data signal, and passes to The computer data processing system being attached thereto, the computer data processing system is processed and calculated to data signal, To immediately arrive at the value of F1, M1, M2, M3, M0.
4. a kind of loading device of fatigue test power, it is characterised in that including base, guide pillar, fixed platform, power load maintainer, Four guide pillars are symmetrically fixedly arranged on the base, and four top ends of guide pillar are connected on a lamina tecti, on the guide pillar A fixed plate and fixed frame are also arranged with successively positioned at the lower section of the lamina tecti, and the fixed platform is fixedly arranged on the base On, the fixation kit for fixing test specimen is provided with, and the fixed platform is located at four centres of guide pillar;
The power load maintainer is watched including the cross reinforcing disk above the fixation kit, the first servo hydraulic cylinder, second Hydraulic cylinder is taken, first servo hydraulic cylinder is perpendicularly fixed in the fixed plate through connector, its piston lever-connection-force sensing Device, and the upper surface that the cross reinforces disk is fixed on through connector, second servo hydraulic cylinder is fixed on institute through connector State on the inner side edge of fixed frame, its piston lever-connection-force sensor, and the side that the cross reinforces disk is fixed on through connector.
5. the loading device of fatigue test power according to claim 4, it is characterised in that the first servo hydraulic cylinder bag One is included to be fixedly arranged on the axial force distribution servo hydraulic cylinder of the cross reinforcing disk upper surface zone line, be installed with the cross reinforcing Moment of flexure force servo hydraulic cylinder at four angles of disk, second servo hydraulic cylinder includes being fixed on the cross reinforcing disk side A pair of moments of torsion force servo hydraulic cylinder.
6. the loading device of fatigue test power according to claim 4, it is characterised in that the loading device also includes that uses In the hoisting mechanism of regulation height of specimen, the hoisting mechanism includes two adjusters being symmetrically fixedly arranged on the base, And the piston rod of the adjuster is fixedly connected with the fixed frame.
7. the loading device of fatigue test power according to claim 4, it is characterised in that the fixation kit includes fixed In bearing and bearing block in the fixed platform.
8. the loading device of fatigue test power according to claim 4, it is characterised in that the connector includes that is spherical Hinge.
9. the loading device of fatigue test power according to claim 4, it is characterised in that the two ends of the base are solid respectively Side plate is provided with, the top end face of the side plate is fixedly connected with the lamina tecti.
CN201410554034.5A 2014-10-17 2014-10-17 Method and device for loading fatigue test force Active CN104266910B (en)

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CN105675425B (en) * 2016-03-10 2018-06-22 宁波拓普集团股份有限公司 A kind of wear test tooling of spherical hinge
CN107345854B (en) * 2017-06-13 2019-10-25 中国航发湖南动力机械研究所 Retarder full court slow test mounting and positioning device
CN108225693A (en) * 2017-12-21 2018-06-29 杭州中德传动设备有限公司 A kind of rotary decelerator rigidity detection device and its detection method
CN111044271A (en) * 2019-08-02 2020-04-21 中国海洋石油集团公司 Hydraulic connector composite load test bed device

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