CN107314934A - Stress measurement device based on flexibility method - Google Patents
Stress measurement device based on flexibility method Download PDFInfo
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- CN107314934A CN107314934A CN201710418129.8A CN201710418129A CN107314934A CN 107314934 A CN107314934 A CN 107314934A CN 201710418129 A CN201710418129 A CN 201710418129A CN 107314934 A CN107314934 A CN 107314934A
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- loading
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- micromatic setting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The present invention discloses a kind of stress measurement device based on flexibility method, including beam clamping device, exert a force loading device, Deng brutal and support plate body, beam clamping device is fixed in support plate body, bare terminal end Deng brutal is positioned on the beam clamping device, the force side for waiting brutal is provided with quasi- cross laser device, the force loading device includes loading supporting plate, the pack support being fixed in loading supporting plate, by powershift gear, single direction ratchet, rope and loading cutting edge, it is described by powershift gear, single direction ratchet is both secured in the loading axis, the loading cutting edge is fixed on the force side of the brutal such as described, pull pressure sensor is installed on the loading cutting edge, described rope one end is fixed on described by powershift gear, the other end is fixed in the pull pressure sensor.Stress measurement device of the invention based on flexibility method, can make to wait brutal to produce reliable predetermined stress state in the range of compared with great force value, and measurement result is more accurate.
Description
Technical field
The present invention relates to a kind of experimental provision, more particularly to a kind of stress test device.
Background technology
For waiting experimental provision of brutal stress measurement to use electrical measuring method mostly in Experiments of Machanics teaching, electrical measuring method is i.e. by thing
The non electrical quantities such as reason amount, mechanical quantity, mechanical quantity, by being pasted onto sensing element (such as foil gauge) measurement on determinand surface and changing
Into electric signal, the experimental method then measured by strain measurement equipment (such as resistance strain gauge), this method is generally used for
Verify the theory of the mechanics of materials, determine the mechanical performance of material.At present in domestic report, brutal experiment dress is waited based on electrical measuring method
Put and be both needed to paste foil gauge collection electric signal, and load mode is typically loaded using counterweight, expensive application material mechanics of Geng Yun etc. is strong
Degree beam theory has manufactured and designed equi intensity cantilever experimental provision, and the device brutal surface strain such as measures by electrical measuring method, adopts
Loaded with the mode for the counterweight that progressively increases step by step, simple in construction, algorithm is reasonable, with good test accuracy；Zhao Wei uses etc.
The mode of intensity beam and foil gauge parallel resistance determines the sensitivity coefficient of resistance strain gage, this method and bridge measurement value phase
Than as a result simply, data are accurate；Domestic Liu Guoqiang, Guo Yong et al. are devised to be used in a cantilever beam deflection measurement apparatus, device
Strain gauge transducer carries out strain measurement, and beam is gone out under corresponding external load function using the relation derivation between amount of deflection and external applied load
Amount of deflection.
For waiting brutal experimental provision based on electrical measuring method, typically enter by the way of resistance strain gage, counterweight are combined
Row stress measurement.Usual measurement data is smaller, and the reliability of its measured value is lower, is influenceed bigger by the artificial factor that manipulates, if
Loaded using counterweight, because the load capability of counterweight is limited, it is impossible to make to wait brutal to produce larger stress state, therefore should
There is the deficiency that can be only tested under compared with low-stress state in experimental provision, and then influence the accuracy of measurement result；Strain
The sticking Quality of piece would generally directly affect the accuracy and reliability to measurement result, if strain gauge adhesion is of low quality, will
It can cause that data are scattered, data distortion, so that measuring point fails.
The content of the invention
It is an object of the invention to provide a kind of stress measurement device based on flexibility method, exist to solve above-mentioned prior art
The problem of, it can make to wait brutal to produce reliable predetermined stress state in the range of compared with great force value, and measurement result is more accurate
Really.
To achieve the above object, the invention provides following scheme：A kind of stress measurement dress based on flexibility method of the present invention
Put including beam clamping device, force loading device, etc. brutal and support plate body, the beam clamping device is fixed on the support
In plate main body, the bare terminal end for waiting brutal is positioned on the beam clamping device, and the force side for waiting brutal is provided with standard
Cross laser device, the force loading device is loaded by rope to the force side for waiting brutal.
The stress measurement device based on flexibility method of the invention, wherein, the force loading device also include loading supporting plate,
The pack support that is fixed in loading supporting plate, by powershift gear, single direction ratchet and loading cutting edge, the loading axis set by bearing
It is placed on the support, described to be both secured to by powershift gear, single direction ratchet in the loading axis, the loading cutting edge is fixed on institute
State etc. and pull pressure sensor to be installed on the force side of brutal, the loading cutting edge, the stress is fixed in described rope one end
On gear, the other end is fixed in the pull pressure sensor.
Stress measurement device of the invention based on flexibility method, wherein, the beam clamping device includes the upper of corresponding setting
It is connected between grip block, lower grip block, and the upper and lower grip block by several screws.
Stress measurement device of the invention based on flexibility method, wherein, the lower clamping plate surface is provided with strong with the grade
The groove that the bare terminal end of beam matches, the bare terminal end for waiting brutal is placed in the groove.
Stress measurement device of the invention based on flexibility method, wherein, the upper and lower surface of the bare terminal end of the brutal such as described is passed through
Embossed surface.
Stress measurement device of the invention based on flexibility method, wherein, in addition to support column main body and leveling device, institute
State support column main body to be fixed in the support plate body, the leveling device includes upper horizontal adjustment plate, lower level and adjusted
Whole plate and several clamping head horizontal screw bolts, each clamping head horizontal screw bolt are threadedly connected to the upper horizontal adjustment
On the diverse location of plate, and each clamping head horizontal screw bolt bottom is resisted against on the lower horizontal adjustment plate, described
Mutually it is fastenedly connected by several screws between upper and lower horizontal adjustment plate, the lower grip block, which is fixed on the upper level, to be adjusted
In whole plate, the lower horizontal adjustment plate is fixed in the support column main body.
Stress measurement device of the invention based on flexibility method, wherein, the leveling device also includes being threadedly connected to
Several support plate body horizontal screw bolts in the support plate body.
Stress measurement device of the invention based on flexibility method, wherein, in addition to load micromatic setting, the load fine setting dress
Put including micromatic setting support and X to displacement micromatic setting, the micromatic setting support is fixed in the loading supporting plate, institute
Stating loading supporting plate can be in the support plate body along X to slip, and the X includes along X to setting to displacement micromatic setting
First screw rod and first support, the first support are fixed in the support plate body, and first screw flight is connected to
In the first support, first screw front end is fixed on the micromatic setting support.
Stress measurement device of the invention based on flexibility method, wherein, the load micromatic setting also includes Y-direction displacement and finely tuned
Device, the Y-direction displacement micromatic setting includes the second screw rod and is fixed on the first sliding block of second screw front end, and described the
Through hole vertically is provided with one sliding block, second screw flight is connected on the micromatic setting support and described
Second screw rod is set along Y direction, and the chute for sliding the first sliding block, the rope are offered on the micromatic setting support
Rope is passed through from the through hole on first sliding block.
Stress measurement device of the invention based on flexibility method, wherein, the Z-direction displacement micromatic setting includes hexagon hollow spiral shell
Post and the second sliding block, the hexagon hollow stud lower end is threadedly connected on the micromatic setting support, threaded upper ends are connected to
On second sliding block, the micromatic setting support is stretched out in the hexagon hollow stud bottom, and hexagon hollow stud is along Z
Direction of principal axis is vertically arranged, and the chute slided up and down for second sliding block is provided with the micromatic setting support, and described second slides
Block is stuck in the chute, the rope point two sections, and epimere rope upper end is connected to the pull pressure sensor upper and lower end
Second upper end of slide block is connected to after being passed through out of through hole on first sliding block, hypomere rope upper end is connected to described six
Angle hollow stud lower end, lower end are connected in the loading axis.
The present invention achieves following technique effect relative to prior art：Due to stress measurement of the present invention based on flexibility method
Device include beam clamping device, force loading device, etc. brutal and support plate body, wait the force side of brutal that quasi- cross is installed
Laser, force loading device, to waiting force side of brutal to load, can make to wait brutal realizing multistage loadings by rope
Premise is issued to larger stress state, and it can make to wait brutal to produce reliable predetermined stress in the range of compared with great force value, and
And compared to electrical measuring method, the experimental provision need not paste foil gauge in measurement process, reached and avoided the shadow because of sticking Quality
The purpose of measurement result is rung, makes measurement result more accurate；
Further, since force loading device includes loading supporting plate, support, by powershift gear, single direction ratchet, rope and loading
Pull pressure sensor is set on cutting edge, loading cutting edge, is combined by click with rope, high-precision pull pressure sensor
Mode is loaded, and the upper end of beam is pressurizeed compared to using large pressing machine, the device significantly reduces accounting for for experimental rig
Ground area, whole device simplifies structure to greatest extent under the premise of guarantee is high-precision.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the dimensional structure diagram of the stress measurement device of the invention based on flexibility method；
Fig. 2 is the dimensional structure diagram of the stress measurement device other direction of the invention based on flexibility method；
Fig. 3 is the front view of the stress measurement device of the invention based on flexibility method.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
As shown in Figure 1, 2, a kind of stress measurement device based on flexibility method of the present invention, including beam clamping device 01, level
Adjusting apparatus 02, force loading device 03, etc. brutal 04, support plate body 05 and support column main body 06,
Beam clamping device 01 includes upper grip block 11, the lower grip block 12 of corresponding setting, waits the bare terminal end of brutal 04 to put
It is placed between upper and lower grip block, and is connected between upper and lower grip block by 7 M8 sunk screws, support column main body 06 is consolidated
Due in support plate body 05；
Leveling device 02 includes upper horizontal adjustment plate 21, lower horizontal adjustment plate 22, several clamping head level spiral shells
Bar (not shown) and several support plate body horizontal screw bolts 24 being threadedly connected in support plate body 05, each clamping head
Portion's horizontal screw bolt is threadedly connected at the diverse location of horizontal adjustment plate 21, and respectively clamping head horizontal screw bolt bottom is equal
It is resisted against on lower horizontal adjustment plate 22, is mutually fastenedly connected by several trip bolts 23 between upper and lower horizontal adjustment plate, under
Grip block 12 is fixed on horizontal adjustment plate 21, and lower horizontal adjustment plate 22 is fixed in support column main body 06, waits brutal 04
Force side is provided with quasi- cross laser device 08, before loading, it is necessary first to using support plate body horizontal screw bolt 24 to supporting plate
Main body 05 carry out Level-adjusting so as to whole device carry out levelness adjustment, then loosen upper and lower horizontal adjustment plate it
Between several trip bolts 23, recycle each clamping head horizontal screw bolt to upper horizontal adjustment plate 21 carry out Level-adjusting,
When it is determined that after good position, each trip bolt 23 is clamped；During whole horizontal adjustment, quasi- cross laser device 08 is put all the time
In opening, by its cross laser line projection to metope outside 4~5m, amplify the inclination of loading device in itself whereby
Angle, according to foundation of the levelness of the cross laser line after amplification on measurement metope as whole device Level-adjusting；
Force loading device 03 includes loading supporting plate 31, the pack support 32 being fixed in loading supporting plate 31, stress
Gear 33, single direction ratchet 34, rope (not shown) and loading cutting edge 35, loading axis 36 are arranged at support 32 by bearing
On, it is both secured to by powershift gear 33, single direction ratchet 34 in loading axis 36, loading cutting edge 35 such as is fixed at the force side of brutal 04,
Pull pressure sensor 37 is provided with by screw on loading cutting edge 35 lower surface, rope one end be fixed on by powershift gear 33, it is another
One end is fixed in pull pressure sensor 37, and pull pressure sensor 37 is furnished with corresponding force value display instrument, can directly display
Measured value, therefore can magnitude of load progress essence of the reciprocity brutal 04 when continuously load or be segmented multistage loadings in real time
True control, loading before single direction ratchet 34 is carried out first with alignment pin it is locked, using the characteristics of single direction ratchet keep loading
The continuity of process, is then now fixed on by powershift gear 33 by the gear wrench of design to being loaded by powershift gear 33
On rope be curled so as to top wait brutal produce pulling force, at the end of loading, outwards rotation remove alignment pin, you can
Single direction ratchet 34 is rotated backward, relaxation rope reaches the purpose of unloading.
In addition, the lower surface of grip block 12 is provided with and waited the groove that the bare terminal end of brutal 04 matches, the folder of brutal 04 is waited
Hold end to be placed in groove, it is to avoid the medium brutal end thin tail sheep of loading procedure is rotated, and strengthens stability.
Embossed surface is passed through on upper and lower surface Deng the bare terminal end of brutal 04, increases clamping friction power, further enhances stabilization
Property.
As shown in Figure 1, 2, the stress measurement device of the invention based on flexibility method also includes load micromatic setting, load fine setting
Device includes micromatic setting support 70, X to displacement micromatic setting, Y-direction displacement micromatic setting and Z-direction displacement micromatic setting, fine setting
Appliance stand 70 is fixed in loading supporting plate 31, and loading supporting plate 31 can be slided in support plate body 05, and X is finely tuned to displacement
Device includes the first screw rod 71 and first support 72 along X to setting, and first support 72 is fixed in support plate body 05, and first
Screw rod 71 is threadedly connected in first support 72, and the front end of the first screw rod 71 is fixedly connected on micromatic setting support 70, rotation the
One screw rod 71, the first screw rod 71 drives all parts in loading supporting plate 31 and loading supporting plate 31 relative to support plate body
05 moves in X-direction；Y-direction displacement micromatic setting includes the second screw rod 73 and is fixed on the first sliding block of the front end of the second screw rod 73
74, be provided with through hole vertically on the first sliding block 74, the second screw rod 73 be threadedly connected on micromatic setting support 70 and
Second screw rod 73 is set along Y direction, and the chute 701 for sliding the first sliding block 74 is offered on micromatic setting support 70,
The second screw rod 73 is rotated, the second screw rod 73 drives the first sliding block 74 to be moved along Y direction, as shown in figure 3, Z-direction displacement fine setting dress
Put including hexagon hollow stud 75, the second sliding block 76, the lower end of hexagon hollow stud 75 and the upper end of the second sliding block 76 are provided with use
In the through hole of connection rope, the lower end of hexagon hollow stud 75 is threadedly connected on micromatic setting support 70, threaded upper ends are connected to
On second sliding block 76, micromatic setting support 70 is stretched out in the bottom of hexagon hollow stud 75, and hexagon hollow stud 75 is along Z axis side
To being vertically arranged, the chute slided up and down for the second sliding block 76 is provided with micromatic setting support 70, the second sliding block 76 is stuck in chute
Interior can only move up and down can not rotate relative to micromatic setting support 70, rope point two sections, and epimere rope upper end is connected to drawing
The upper and lower end of pressure sensor 37 is passed through out of through hole on the first sliding block 74 and is connected on the through hole of the upper end of the second sliding block 76, under
Section rope upper end is connected in the through hole of the lower end of hexagon hollow stud 75, lower end is connected in loading axis 36, when detected materials
When yield stress is smaller, the interval of beam loading is smaller, it is necessary to when being finely adjusted to the load of application, can rotate Z-direction displacement micro-
The hexagon hollow stud 75 in structure is adjusted to be adjusted the slackness of stand under load rope, to reach the purpose of control load size,
In addition the second sliding block 76, which is stuck in chute, can only move up and down and can not be rotated relative to micromatic setting support 70, and can play prevents rope
Suo Zishen distortions produce the effect of additional torque.
When the cross-sectional height of beam is much smaller than span, the influence very little to deformation is sheared, but in accurate measurement, still need to
To reduce beam as far as possible in deformation process due to shear stress caused by lateral twisting；In addition, in order that waiting brutal acquisition larger
Internal stress, can produce larger deflection value, now one end of beam stand under load can then produce larger horizontal displacement after some material loadings,
Now the beam length of actual participation can shorten in beam bemding moment formula, make the stress value finally produced less than normal.Therefore, it is former more than
Cause, this experimental provision devises X to, Y-direction displacement fine adjusting mechanism, it is possible to achieve the rope centering of Y-direction and X to displacement finely tune
Function.
Contactless video measuring instrument is demarcated to the side of section towards grade brutal, before loading in reciprocity brutal fixing point step by step
While loading, reciprocity brutal carries out the measurement of deflection value.Instrument should be first carried out behind the position that video measuring instrument is determined before loading
Demarcation, in experiment video measuring instrument be placed on away from wait brutal experimental rig about 1m place, from 40.12mm length pressure biography
One side of sensor carries out the demarcation in amount of deflection direction, and selects on sensor side at 2 points, while recording distance between two points and pixel
Coordinate value, thus just can obtain the substitution ratio of length and pixel, actural deflection value is that pixel value difference multiplies amount of deflection direction calibration value,
The substitution ratio of target point and length and pixel is chosen simultaneously in displacement measurement window domestic demand.
Specific case is applied in the present invention to be set forth the principle and embodiment of the present invention, above example
Illustrate the method and its core concept for being only intended to help to understand the present invention；Simultaneously for those of ordinary skill in the art, according to
According to the thought of the present invention, it will change in specific embodiments and applications.In summary, this specification content
It should not be construed as limiting the invention.
Claims (10)
1. a kind of stress measurement device based on flexibility method, it is characterised in that：Including beam clamping device (01), force loading device
, (03) brutal (04) and the support plate body (05) such as, the beam clamping device (01) are fixed in the support plate body (05),
The bare terminal end for waiting brutal (04) is positioned on the beam clamping device (01), and the force side for waiting brutal (04) is provided with
Quasi- cross laser device (08), the force loading device (03) is loaded by rope to the force side for waiting brutal (04).
2. the stress measurement device according to claim 1 based on flexibility method, it is characterised in that：The force loading device
(03) loading supporting plate (31), the pack support (32) being fixed in loading supporting plate (31) are also included, by powershift gear (33), list
To ratchet (34) and loading cutting edge (35), the loading axis (36) is arranged on the support (32) by bearing, the stress
Gear (33), single direction ratchet (34) are both secured in the loading axis (36), and it is strong that the loading cutting edge (35) is fixed on the grade
Pull pressure sensor (37) is installed on the force side of beam (04), the loading cutting edge (35), institute is fixed in described rope one end
State by powershift gear (33), the other end is fixed in the pull pressure sensor (37).
3. the stress measurement device according to claim 2 based on flexibility method, it is characterised in that：The beam clamping device
(01) including corresponding setting upper grip block (11), between lower grip block (12), and the upper and lower grip block by some
Individual screw is connected.
4. the stress measurement device according to claim 3 based on flexibility method, it is characterised in that：The lower grip block (12)
Surface is provided with to be placed in described with the groove that matches of bare terminal end for waiting brutal (04), the bare terminal end for waiting brutal (04)
In groove.
5. the stress measurement device according to claim 4 based on flexibility method, it is characterised in that：The brutal (04) such as described
Embossed surface is passed through on the upper and lower surface of bare terminal end.
6. the stress measurement device according to claim 2 based on flexibility method, it is characterised in that：Also include support column main body
(06) and leveling device (02), the support column main body (06) is fixed in the support plate body (05), the level
Adjusting apparatus (02) includes upper horizontal adjustment plate (21), lower horizontal adjustment plate (22) and several clamping head horizontal screw bolts, institute
Each clamping head horizontal screw bolt is stated to be threadedly connected at the diverse location of the upper horizontal adjustment plate (21), and each folder
Hold head level screw rod bottom to be resisted against on the lower horizontal adjustment plate (22), pass through between the upper and lower horizontal adjustment plate
Several screws are mutually fastenedly connected, and the lower grip block (12) is fixed on the upper horizontal adjustment plate (21), the lower water
Heibei provincial opera whole plate (22) is fixed on the support column main body (06).
7. the stress measurement device according to claim 6 based on flexibility method, it is characterised in that：The leveling device
(02) several support plate body horizontal screw bolts (24) being threadedly connected in the support plate body (05) are also included.
8. the stress measurement device according to claim 2 based on flexibility method, it is characterised in that：Also include load and finely tune dress
Put, the load micromatic setting includes micromatic setting support (70) and X to displacement micromatic setting, the micromatic setting support (70)
It is fixed on loading supporting plate (31), the loading supporting plate (31) can be in the support plate body (05) along X to cunning
Dynamic, the X includes the first screw rod (71) and first support (72) along X to setting, the first support to displacement micromatic setting
(72) it is fixed in the support plate body (05), first screw rod (71) is threadedly connected in the first support (72),
First screw rod (71) front end is fixed on the micromatic setting support (70).
9. the stress measurement device according to claim 8 based on flexibility method, it is characterised in that：The load micromatic setting
Also include Y-direction displacement micromatic setting, the Y-direction displacement micromatic setting includes the second screw rod (73) and is fixed on second screw rod
(73) through hole vertically, second screw rod are provided with the first sliding block (74) of front end, first sliding block (74)
(73) it is threadedly connected on the micromatic setting support (70) and second screw rod (73) is set along Y direction, it is described micro-
The chute (701) offered on appliance stand (70) for sliding the first sliding block (74) is adjusted, the rope is slided from described first
Through hole on block (74) is passed through.
10. the stress measurement device according to claim 9 based on flexibility method, it is characterised in that：The Z-direction displacement fine setting
Device includes hexagon hollow stud (75) and the second sliding block (76), and hexagon hollow stud (75) lower end is threadedly connected to described
On micromatic setting support (70), threaded upper ends be connected on second sliding block (76), hexagon hollow stud (75) lower end
The micromatic setting support (70) is stretched out in portion, and hexagon hollow stud (75) is vertically arranged along Z-direction, the micromatic setting
The chute slided up and down for second sliding block (76) is provided with support (70), second sliding block (76) is stuck in the chute
It is interior, the rope point two sections, epimere rope upper end is connected to the pull pressure sensor (37) upper and lower end from described first
The second sliding block (76) upper end is connected to after being passed through in through hole on sliding block (74), hypomere rope upper end is connected to the hexagonal
Hollow stud (75) lower end, lower end are connected in the loading axis (36).
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| CN201710418129.8A CN107314934B (en) | 2017-06-06 | 2017-06-06 | Stress measurement device based on flexibility method |
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| CN111537127A (en) * | 2020-05-13 | 2020-08-14 | 西北工业大学 | Full-range calibration method of X-ray stress gauge |
| CN112129557A (en) * | 2020-09-23 | 2020-12-25 | 中车长春轨道客车股份有限公司 | Device and method for testing strength of universal door steps of subway vehicle |
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| CN111207884A (en) * | 2020-01-17 | 2020-05-29 | 西北工业大学 | Design and manufacturing method of standard sample of residual stress deflection method calibration device |
| CN111207884B (en) * | 2020-01-17 | 2021-07-13 | 西北工业大学 | Design and manufacturing method of standard sample of residual stress deflection method calibration device |
| CN111537127A (en) * | 2020-05-13 | 2020-08-14 | 西北工业大学 | Full-range calibration method of X-ray stress gauge |
| CN111537127B (en) * | 2020-05-13 | 2022-03-11 | 西北工业大学 | Full-range calibration method of X-ray stress gauge |
| CN112129557A (en) * | 2020-09-23 | 2020-12-25 | 中车长春轨道客车股份有限公司 | Device and method for testing strength of universal door steps of subway vehicle |
| CN112129557B (en) * | 2020-09-23 | 2023-08-18 | 中车长春轨道客车股份有限公司 | Device and method for testing strength of general door step of metro vehicle |
| CN112611560A (en) * | 2020-12-16 | 2021-04-06 | 福建中维动力科技股份有限公司 | Bearing capacity check out test set of heavy truck transmission shaft of different diameter specifications of adaptation |
| CN112611560B (en) * | 2020-12-16 | 2022-11-01 | 福建中维动力科技股份有限公司 | Bearing capacity detection equipment adaptive to heavy truck transmission shafts with different diameters |
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