CN206593847U - Gear box casing deformation test system - Google Patents
Gear box casing deformation test system Download PDFInfo
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- CN206593847U CN206593847U CN201720304465.5U CN201720304465U CN206593847U CN 206593847 U CN206593847 U CN 206593847U CN 201720304465 U CN201720304465 U CN 201720304465U CN 206593847 U CN206593847 U CN 206593847U
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Abstract
The utility model discloses a kind of gear box casing deformation test system, including test-bed device and TT＆C system, test-bed device includes base, and end connecting bracket and end support seat that positioning method is provided with gearbox to be measured are installed according to real vehicle；For the fixation locking mechanism for the output shaft for fixing locking gearbox to be measured, loader support and the torque loading device on loader support, the input shaft of the output shaft of torque loading device and gearbox to be measured are coaxially connected；TT＆C system includes the torque sensor on the output shaft of torque loading device, it is pasted onto the strain gauge transducer on the tested point of the housing of gearbox to be measured, data collecting system and computer, torque sensor and strain gauge transducer are connected to computer by data collecting system.The utility model has loading method simple, and control is high with response accuracy, the advantages of reproducible, can improve the efficiency and accuracy of gear box casing deformation test.
Description
Technical field
The utility model is related to auto parts and components detection technique field, in particular to a kind of gear box casing deformation test
System.
Background technology
Gear box casing is connected with the vehicle part such as engine, suspension as the important foundation part in transmission assembly,
The relevant parts such as the gear in gearbox, axle, bearing and shift fork are assembled into an entirety, kept between gear, shafting
Correct position, and them is transmitted power in phase according to certain drive connection.Each axle of speed changer passes through bearings
On casing, during gear drive, casing bears larger load, while power it bears vehicle braking or accelerated again when
Inertia force caused by assembly is with impacting and producing larger deformation and stress, therefore the intensity of casing, rigidity and fatigue behaviour are straight
Reliability and the life-span of influence speed changer are connect, and then influences the performance of vehicle.At present, rarely has the intensity to gear box
The research tested with rigidity.
Utility model content
For above-mentioned the deficiencies in the prior art, technical problem to be solved in the utility model is：How a kind of add is provided
Support method is simple, and control is high with response accuracy, reproducible, is conducive to improving the efficiency of gear box casing deformation test and accurate
The gear box casing deformation test system of property.
In order to solve the above-mentioned technical problem, the utility model employs following technical scheme：
A kind of gear box casing deformation test system, it is characterised in that including test-bed device and TT＆C system, institute
Test-bed device is stated including base, for the end connecting bracket of the input shaft end of fixing gearbox and for supporting gearbox
Output shaft end end support seat, the end connecting bracket and end support seat are upper to be provided with according to real vehicle installation positioning method
Gearbox to be measured；The side that the base is located at the output shaft of the gearbox to be measured is provided with for fixing locking speed change to be measured
The fixation locking mechanism of the output shaft of case, the output shaft of the gearbox to be measured is fixedly connected in the fixed locking mechanism；
The side that the base is located at the input shaft of the gearbox to be measured is provided with loader support and installed in the loader
Torque loading device on support, the input shaft of the output shaft of the torque loading device and the gearbox to be measured coaxially connects
Connect；The TT＆C system includes the torque sensor on the output shaft of the torque loading device, is pasted onto change to be measured
Strain gauge transducer on the tested point of the housing of fast case, data collecting system and computer, the torque sensor and should
Variant sensor is connected to the computer by the data collecting system；The computer is also associated with being used to control institute
The Loading Control device of the output torque of torque loading device is stated, the Loading Control device is connected to the torque loading device.
Using said system, by computer controlled loading controller, major control torque loading device is according to setting value
The loading of moment of torsion is carried out to the input shaft of gearbox to be measured, because fixed locking mechanism is by the output shaft locking of gearbox to be measured,
So that the input shaft and output shaft of gearbox have relative torsional deflection, change the stressing conditions at housing bearings, make
Moment of torsion is applied on gear box casing, causes the deformation of gear box casing, passes through the strain being pasted onto on gear box casing to be measured
Formula sensor can detect the strain data of housing, and be input to by data collecting system in computer, and calculating is led
Stress value, completes the measurement deformed to gear box casing.Torque sensor is installed on the output shaft of torque loading device, is easy to
Data collecting system and computer can get the real-time moment of torsion of torque loading device output, it is possible to achieve moment of torsion is loaded and filled
Closed-loop control is put, the precision of torque output is improved.
Further, the loader support is the flexible elastic support in lower end.
So, it is possible to reduce because sample deformations drive the small torque load of torque loading device when applying torque load,
With buffering and the effect resetted.
Further, the strain gauge transducer is provided with multiple, is respectively adhered on the output shaft rear axle of gearbox to be measured
The outer ledge of bearing hole after the outer ledge of bearing bore, jackshaft, at the imposed load of rear shell position of bearings, middle shell position of bearings applies
Load on the outside of He Chu and main box.
Because above-mentioned position is typically that gearbox stress and finite element analysis stress in actual driving conditions are larger
Position, sets strain gauge transducer to obtain more accurately measurement result at these positions.
Further, the torque loading device is that hydraulic servo reverses actuator.
Hydraulic servo, which reverses actuator, has the characteristics such as dynamic response precision is high, load stiffness is big, control power is big.Using
Hydraulic servo, which reverses actuator, can realize accurately moment of torsion input, be conducive to improving measurement accuracy.
In summary, the utility model has loading method simple, and control is high with response accuracy, the advantages of reproducible,
The efficiency and accuracy of gear box casing deformation test can be improved.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is that moment of torsion amplitude is 100Nm loading curves 1 when gearbox is in a file location.
Fig. 3 is that moment of torsion amplitude is 100Nm loading curves 2 when gearbox is in a file location.
Fig. 4 is that moment of torsion amplitude is 200Nm loading curves 1 when gearbox is in a file location.
Fig. 5 is that moment of torsion amplitude is 200Nm loading curves 2 when gearbox is in a file location.
Fig. 6 is that moment of torsion amplitude is 270Nm loading curves 1 when gearbox is in a file location.
Fig. 7 is that moment of torsion amplitude is 270Nm loading curves 2 when gearbox is in a file location.
Fig. 8 is that moment of torsion amplitude is 300Nm loading curves 1 when gearbox is in a file location.
Fig. 9 is that moment of torsion amplitude is 300Nm loading curves 2 when gearbox is in a file location.
Figure 10 is strain figure of the measuring point 1 under 200Nm loading levels when gearbox is in a file location.
Figure 11 is calculating stress diagram of the measuring point 1 under 200Nm loading levels when gearbox is in a file location.
Figure 12 is strain figure of the measuring point 2 under 200Nm loading levels when gearbox is in a file location.
Figure 13 is calculating stress diagram of the measuring point 2 under 200Nm loading levels when gearbox is in a file location.
Figure 14 is the principal stress value of 3 gears under 300Nm loading levels of measuring point 1.
Figure 15 is the principal stress value of 3 gears under 300Nm loading levels of measuring point 2.
Figure 16 is the principal stress value under different loading amplitude steady state conditions of measuring point 1 when gearbox is in a file location.
Figure 17 is the principal stress value under different loading amplitude steady state conditions of measuring point 2 when gearbox is in a file location.
Figure 18 is that the principal stress difference under different loading amplitude steady state conditions of measuring point 1 is contrasted when gearbox is in a file location
Figure.
Figure 19 is that the principal stress difference under different loading amplitude steady state conditions of measuring point 2 is contrasted when gearbox is in a file location
Figure.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
During specific implementation：As shown in figure 1, a kind of gear box casing deformation test system, including test-bed device 1 and
TT＆C system 2, the test-bed device 1 includes base 11, the end connecting bracket 12 of the input shaft end for fixing gearbox
And for the end support seat 13 for the output shaft end for supporting gearbox, pressed on the end connecting bracket 12 and end support seat 13
According to the facts car installs positioning method and is provided with gearbox 14 to be measured；The base 11 is located at the output shaft of the gearbox 14 to be measured
Side is provided with the fixation locking mechanism 15 of the output shaft for fixing locking gearbox to be measured, the gearbox 14 to be measured it is defeated
Shaft is fixedly connected in the fixed locking mechanism 15；The base 11 is located at the one of the input shaft of the gearbox 14 to be measured
Side is provided with loader support 16 and the torque loading device 17 on the loader support 16, the moment of torsion loading
The input shaft of the output shaft of device 17 and the gearbox 14 to be measured is coaxially connected；The TT＆C system 2 includes being arranged on described
Torque sensor 21 on the output shaft of torque loading device 17, is pasted onto answering on the tested point of the housing of gearbox 14 to be measured
Variant sensor 22, data collecting system 23 and computer 24, the torque sensor 21 and strain gauge transducer 22 lead to
Cross the data collecting system 23 and be connected to the computer 24；The computer 24 is also associated with being used to control the moment of torsion to add
The Loading Control device 25 for the output torque for putting 17 is carried, the Loading Control device 25 is connected to the torque loading device 17.
Using said system, by computer controlled loading controller, major control torque loading device is according to setting value
The loading of moment of torsion is carried out to the input shaft of gearbox to be measured, because fixed locking mechanism is by the output shaft locking of gearbox to be measured,
So that the input shaft and output shaft of gearbox have relative torsional deflection, change the stressing conditions at housing bearings, make
Moment of torsion is applied on gear box casing, causes the deformation of gear box casing, passes through the strain being pasted onto on gear box casing to be measured
Formula sensor can detect the strain data of housing, and be input to by data collecting system in computer, and calculating is led
Stress value, completes the measurement deformed to gear box casing.Torque sensor is installed on the output shaft of torque loading device, is easy to
Data collecting system and computer can get the real-time moment of torsion of torque loading device output, it is possible to achieve moment of torsion is loaded and filled
Closed-loop control is put, the precision of torque output is improved.
During implementation, the loader support 16 is the flexible elastic support in lower end.
So, it is possible to reduce because sample deformations drive the small torque load of torque loading device when applying torque load,
With buffering and the effect resetted.
During implementation, the strain gauge transducer 22 be provided with it is multiple, after the output shaft for being respectively adhered on gearbox 14 to be measured
The outer ledge of bearing hole after the outer ledge of bearing hole, jackshaft, at the imposed load of rear shell position of bearings, middle shell position of bearings
At imposed load and on the outside of main box.
Because above-mentioned position is typically that gearbox stress and finite element analysis stress in actual driving conditions are larger
Position, sets strain gauge transducer to obtain more accurately measurement result at these positions.
During implementation, the torque loading device 17 is that hydraulic servo reverses actuator.
Hydraulic servo, which reverses actuator, has the characteristics such as dynamic response precision is high, load stiffness is big, control power is big.Using
Hydraulic servo, which reverses actuator, can realize accurately moment of torsion input, be conducive to improving measurement accuracy.
When it is implemented, being additionally provided with angular displacement sensor on the output shaft of the torque loading device 17.So, can be with
Speed changer initial position is adjusted by the control of angle, interval is eliminated, in order to carry out moment of torsion control, is conducive to improving what is measured
Accuracy.
During experiment, using following steps：A, above-mentioned gear box casing deformation test system is first obtained, gearbox to be measured is pressed
According to the facts car is installed positioning method and is arranged on test-bed device 1, and the output shaft locking of gearbox to be measured is fixed；
B, the input shaft of gearbox to be measured is connected with the output shaft of torque loading device, and moment of torsion is set between
Sensor and angular displacement sensor, are respectively used to detect the corner of the output shaft of torque loading device and are applied to gearbox to be measured
Input shaft moment of torsion；
C, the tested point for choosing on the housing of gearbox to be measured housing distortion, and are attached to selection by foil gauge or strain rosette
Tested point at；
D, the detection signal for obtaining by computer torque sensor and angular displacement sensor in real time, before gearbox is linked into
Enter in gear or reverse gear, control mode loading device is carried out to the input shaft of gearbox to be measured by the way of closed-loop control
Loading, during loading, is first gradually increased to torque setting value in time t1 by the output torque of torque loading device by zero, and
Keep stable in time t2, be then gradually decrease to zero by the torque setting value in time t3；
E, record are pasted onto the foil gauge on tested point or the strain data of strain rosette, pass through stress-strain reduction formula
Calculate the principal stress value for obtaining tested point.
Using the above method, gearbox is linked into advance or reverse gear, by torque loading device to the defeated of gearbox
Enter axle to be loaded, because the output shaft of gearbox fixes locking so that the input shaft and output shaft of gearbox exist relative
Torsional deflection, changes the stressing conditions at housing bearings, moment of torsion is applied on gear box casing, cause gear box casing
Deformation, the strain data of gear box casing is detected using foil gauge or strain rosette, it is public by the conversion of stress-strain
Formula, can obtain accurate principal stress value.Torque loading device output is able to ensure that using the close-loop control mode of computer
Torque precision is higher, and reliable and stable；Moment of torsion is gradually increased to torque setting value by zero and is gradually reduced by torque setting value
To zero loading procedure, the dynamic deformation process of gear box casing can be tested；Moment of torsion is maintained at torque setting value,
The static deformation process of gear box casing can be tested.So, the dynamic and static state to gear box casing can be completed
Deformation process is tested, close to the physical constraint situation of gearbox, is conducive to improving the reliability and accuracy tested.Set
Angular displacement sensor, can eliminate interval by angle control adjustment speed changer initial position, in order to carry out moment of torsion control,
Be conducive to improving the accuracy measured.
Wherein, it is to be measured on different gears to being in during gearbox is linked into 1 grade, 2 grades and reversed gear respectively in the step D
The input shaft of gearbox is loaded, and is gradually increased to the output torque of torque loading device by zero in identical time t1
Same torque setting value, and keep stable in identical time t2, then by the torque setting value in identical time t3
It is gradually decrease to zero.
Because 1 grade of gearbox, 2 gears and the speed reversed gear are than larger, output speed is low and moment of torsion is big, so in 1 grade, 2 gears and R
Moment of torsion, engagement force and the stressed shell that gear gear is transmitted are all than larger.Using above-mentioned operating mode loading method, change can be simulated
The larger situation of fast tank shell stress during actual travel, is conducive to improving the efficiency and accuracy tested.
Wherein, in the step D, on same gear, multiple different torque setting values are respectively adopted to speed change to be measured
The input shaft of case is loaded, it is ensured that t1, t2 and t3 difference correspondent equal in each loading procedure.
Using the above method, in different torque setting values, control t1, t2 and t3 difference correspondent equal so that in phase
In same time t1 and identical time t3, due to the difference of amplitude so that the slope of moment of torsion loading curve can change, this
Sample, can be tested the dynamic deformation process of housing during different dynamic loads.And by different torque setting values
It is kept stable in identical time t2, transmission housing deformation process under different static amplitude load conditions can be surveyed
Examination.So, the steady state loadings of gearbox different amplitudes suffered during actual travel, different slope can be tested
Deformation under dynamic load change, can effectively improve the efficiency and accuracy of experiment.
Embodiment：Because one grade of two gear of gearbox and the speed reversed gear are than greatly, output speed is low and moment of torsion is big, so one grade,
Two gears and R keep off the gear moment of torsion, the engagement force that are transmitted, and stressed shell main considers transmission assembly 1 all than larger
The stressing conditions of gear, 2 gears and R gears under input torque effect.
Using Variable Amplitude, the load mode of variable slope, gearbox dynamic and static deformation process of the test, experiment are considered
When, on each gear of 1 gear, 2 gears and R gears, in 20s, respectively by moment of torsion Slow loading to 100Nm, 200Nm, 270Nm and
300Nm, and keep stablizing 20s, then in 20s, will be slowly from 100Nm, 200Nm, 270Nm and 300Nm by moment of torsion respectively
0Nm.During loading, moment of torsion is gradually increased or reduced, the dynamic deformation process of gear box casing can tested.And by width
Value stabilization for a period of time, can be tested the static deformation process of gear box casing.The process for increasing or reducing in moment of torsion
In, because in equal 20s, the amplitude of change in torque is of different sizes so that the slope of amplitude change is different.So, may be used
To be measured to dynamic housing distortion during different dynamic loads.And can be right in different amplitudes by moment of torsion stabilization
Transmission housing deformation process is measured under different static state amplitude load conditions.Moment of torsion is loaded as shown in Fig. 2 to Fig. 9, from adding
Carry curve to can be seen that moment of torsion loading stabilization and can well be zeroed, illustrate that this pilot system loading accuracy is high, repeated
It is good.
During real data processing, the situation of change of every group of data is looked first at, slightly sees whether data are normal and repeated
Whether master good and that the strain data of each measuring point is obtained into each measuring point by the calculating of stress-strain reduction formula answers
Force value, calculates the difference of each measuring point steady state data of 3 samples under every kind of loading condition, and load steady after preceding and loading
The difference of state data, with check strain transducer whether the repeatability of working properly and this pilot system.
Strain-EXPERIMENTAL STRAIN-STRESS CONVERSION formula of three axle Y type isogonism strain rosettes is as follows：
Wherein, εxAnd εyRespectively x-axis and the normal strain in y-axis direction, ε30、ε90And ε150Respectively along 30 °, 90 ° and 150 ° sides
To normal strain, σ1,σ2For measuring point principal stress, τmaxFor measuring point maximum shear, γxyFor shear strain, E is modulus of elasticity, and ν is pool
Pine ratio.The stress-strain calculation formula of uniaxial strain piece is as follows：
σ=E ε (7)
σ is stress, and ε is strain, and E is modulus of elasticity
A file location is now in speed changer, the axle Y type isogonisms strain rosette of measuring point 1 three, the uniaxial strain piece of measuring point 2 are in 200Nm
Exemplified by strain-stress variation situation under loading level, data processed result is as shown in Figure 10~Figure 13.
After installation and debugging are finished, tested, 5 each 3 unstrained samples of R grades, 1 grade and 2 grades of measuring point gathered respectively,
Principal stress value is calculated according to formula (1)-(7).Only illustrate to test with the strain curve of measuring point 2 under one grade of 200Nm loading levels
As a result.From Fig. 9~Figure 12, during experiment loading, test data is stable to be risen, when moment of torsion is stable, measuring point principal stress and strain
It is held essentially constant, stress and strain value is returned to before experiment after unloading, test data can well be zeroed, illustrates the transmission housing
Body deformation test system has good repeatability.
By taking measuring point 1 and measuring point 2 as an example, Figure 14 is the principal stress value of 3 gears under 300Nm loading levels of measuring point 1；Figure 15
For the principal stress value of 3 gears under 300Nm loading levels of measuring point 2；Measuring point 1 is not when Figure 16 is in a file location for gearbox
With the principal stress value under loading amplitude steady state condition；Measuring point 2 is in different loading amplitudes when Figure 17 is in a file location for gearbox
Principal stress value under steady state condition；Figure 18 is that measuring point 1 is loaded under amplitude steady state conditions different when gearbox is in a file location
Principal stress difference comparison diagram；Figure 19, which is that measuring point 2 is main under different loading amplitude steady state conditions when gearbox is in a file location, to be answered
Power difference comparison diagram.
Under Figure 14 and 15, stable state 300Nm loading environments, one grade, two gears and R grades of sample measuring point 1, measuring point 2 should
The tensile strength values of power maximum, respectively less than tank material, meet intensity requirement.
From Figure 16 and 17, measuring point 1, measuring point 2 stress value under different loading levels are different, increase with loading level and lead
Stress value is in increasing trend, in 300Nm, and principal stress value is maximum；From Figure 18 and 19, in same moment of torsion loading level
Under, the stress difference of each measuring point is stable, and with the increase of moment of torsion loading level, stress difference gradually increases, and meets reality
Border situation, sample data repeatability is good, and the stress difference of measuring point 2 is larger, illustrates that the stress value that measuring point 2 is born is larger.Its middle part
Divide S1 initial stress values difference under different moment of torsion loading levels, mainly experimental test interval is slightly shorter, foil gauge has remaining answer
Power causes.
As the above analysis, using the case of transmission deformation test system of Hydraulic Servo System Design, loading method
Simply, reproducible, precision is high, with higher dynamic response characteristic.Using variable slope and Variable Amplitude load mode, synthesis is examined
The dynamic and composite seal deformation process of gearbox are considered, close to the physical constraint situation of speed changer.Result of the test shows, same
Under kind of moment of torsion loading level, the stress difference of each measuring point is stable, with the increase of moment of torsion loading level, stress difference by
It is cumulative to add, tally with the actual situation.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not using the utility model as limitation
Any modifications, equivalent substitutions and improvements made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (4)
1. a kind of gear box casing deformation test system, it is characterised in that including test-bed device（1）And TT＆C system
（2）, the test-bed device（1）Including base（11）, the end connecting bracket of the input shaft end for fixing gearbox（12）
And for the end support seat for the output shaft end for supporting gearbox（13）, the end connecting bracket（12）With end support seat
（13）On according to real vehicle install positioning method gearbox to be measured is installed（14）；The base（11）Positioned at the gearbox to be measured
（14）The side of output shaft be provided with the fixation locking mechanism of the output shaft for fixing locking gearbox to be measured（15）, it is described
Gearbox to be measured（14）Output shaft be fixedly connected on the fixed locking mechanism（15）On；The base（11）Treated positioned at described
Survey gearbox（14）The side of input shaft be provided with loader support（16）And installed in the loader support（16）On
Torque loading device（17）, the torque loading device（17）Output shaft and the gearbox to be measured（14）Input shaft it is same
Axle is connected；The TT＆C system（2）Including installed in the torque loading device（17）Output shaft on torque sensor
（21）, it is pasted onto gearbox to be measured（14）Housing tested point on strain gauge transducer（22）, data collecting system（23）
And computer（24）, the torque sensor（21）And strain gauge transducer（22）Pass through the data collecting system（23）
It is connected to the computer（24）；The computer（24）It is also associated with being used to control the torque loading device（17）Output
The Loading Control device of moment of torsion（25）, the Loading Control device（25）It is connected to the torque loading device（17）.
2. gear box casing deformation test system as claimed in claim 1, it is characterised in that the loader support（16）For
The flexible elastic support in lower end.
3. gear box casing deformation test system as claimed in claim 1, it is characterised in that the strain gauge transducer（22）
It is provided with multiple, is respectively adhered on gearbox to be measured（14）The outer ledge in rear bearing, output shaft hole, bearing hole after jackshaft
Outer ledge, at the imposed load of rear shell position of bearings, at the imposed load of middle shell position of bearings and on the outside of main box.
4. gear box casing deformation test system as claimed in claim 1, it is characterised in that the torque loading device（17）
Actuator is reversed for hydraulic servo.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720304465.5U CN206593847U (en) | 2017-03-27 | 2017-03-27 | Gear box casing deformation test system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720304465.5U CN206593847U (en) | 2017-03-27 | 2017-03-27 | Gear box casing deformation test system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702917A (en) * | 2017-11-07 | 2018-02-16 | 中铁检验认证中心 | A kind of EMUs gear-box forms static test bed |
| CN109269913A (en) * | 2018-11-05 | 2019-01-25 | 安徽江淮汽车集团股份有限公司 | A kind of transmission assembly shell strain detection testing device |
| CN109738182A (en) * | 2019-01-22 | 2019-05-10 | 清研新能源汽车工程中心（襄阳）有限公司 | A kind of polytypic differential mechanism test fixed case |
| CN112393901A (en) * | 2020-11-27 | 2021-02-23 | 马鞍山市龙腾机电科技有限公司 | Gearbox shell performance detection equipment and detection method for stereoscopic parking space |
-
2017
- 2017-03-27 CN CN201720304465.5U patent/CN206593847U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702917A (en) * | 2017-11-07 | 2018-02-16 | 中铁检验认证中心 | A kind of EMUs gear-box forms static test bed |
| CN109269913A (en) * | 2018-11-05 | 2019-01-25 | 安徽江淮汽车集团股份有限公司 | A kind of transmission assembly shell strain detection testing device |
| CN109738182A (en) * | 2019-01-22 | 2019-05-10 | 清研新能源汽车工程中心（襄阳）有限公司 | A kind of polytypic differential mechanism test fixed case |
| CN112393901A (en) * | 2020-11-27 | 2021-02-23 | 马鞍山市龙腾机电科技有限公司 | Gearbox shell performance detection equipment and detection method for stereoscopic parking space |
| CN112393901B (en) * | 2020-11-27 | 2022-09-16 | 马鞍山市龙腾机电科技有限公司 | Gearbox shell performance detection equipment and detection method for stereoscopic parking space |
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